Abstract:
An apparatus and method for signal optimization is disclosed. This disclosure relates to improved device and method for improving performance and reducing cosite interference for an antenna array. More particularly, this description relates to a device and method for equalizing signals for communication receivers, and more particularly, to a device and method for matrixed adaptive equalizing configured to a plurality of antennas for receiving one or more signals each designated for one of a plurality of receivers.

Description:
FIELD 
       [0001]    This description relates generally to equalizing signals for communication receivers, and more particularly, to a device and method for matrixed adaptive equalizing for communication receivers configured to an antenna array. 
       BACKGROUND 
       [0002]    Operational requirements for increased communication needs are currently met by adding “stovepipe” circuits. To increase bandwidth for increasing communication needs are generally met by merely adding independent apertures, each aperture including an antenna configured to one receiver. One aperture works independently from another. Accordingly, with the increase in the number of these independent apertures, each aperture transmitting and receiving signals independently, cosite interference from one or more aperture to another is increased. The cosite interference is further aggravated where the physical proximities of the independent antennas are close together. Accordingly, device and method for improving performance and reducing cosite interference are desirable. 
       BRIEF SUMMARY 
       [0003]    This description relates to a device and method for signal optimization. The description relates to a device and method for improving performance and reducing cosite interference for an antenna array. This description relates to a device and method for equalizing signals for communication receivers. The description relates to a device and method for matrixed adaptive equalizing configured to a plurality of antennas for receiving one or more signals each designated for one of a plurality of receivers. 
         [0004]    In one embodiment, a method for reducing cosite interference is provided. The embodied method for reducing cosite interference comprises receiving a first transmitted signal via a plurality of receiving antennas, the first transmitted signal includes a first training sequence. The embodied method includes a plurality of received signals, wherein each received signal includes the first transmitted signal, and a cosite interference signal, the cosite interference signal includes a cosite training sequence. The embodied method includes directing the plurality of received signals to a processing device. The embodied method includes directing a cosite sample signal to the processing device, the cosite sample signal includes the cosite training sequence. The embodied method includes, for each receiving antenna that receives the received signal, processing the cosite interference signal using the cosite sample signal to produce a cosite equalized signal, and processing the received signal to produce an equalized signal. The embodied method includes phase aligning the equalized signals to produce a plurality of aligned signals. The embodied method includes phase aligning the cosite equalized signals to produce a plurality of cosite aligned signals. The embodied method includes directing the plurality of aligned signals and the plurality of cosite aligned signals to a combiner. The embodied method includes summing the plurality of aligned signals based on the first training sequence and the plurality of cosite aligned signals based on the cosite training sequence to produce a first processed signal. The embodied method includes directing the first processed signal to one of a plurality of receivers based on the first training sequence. 
         [0005]    In another embodied method, the processing of the cosite interference signal using the cosite sample signal to produce the cosite equalized signal includes determining a channel distortion from comparing the cosite training sequence of the cosite sample signal and the cosite training sequence of the cosite interference signal. 
         [0006]    In another embodied method, the processing of the received signal to produce the equalized signal includes using the channel distortion. 
         [0007]    In another embodied method, the cosite interference signal includes an analog cosite data. In the embodied method, the first transmitted signal includes an analog first data. In the embodied method, for each receiving antenna that receives the received signal, prior to the processing the received signal and prior to the processing the cosite interference signal, there is digital conversion of the received signal to digital and digital conversion of the cosite sample signal to digital. 
         [0008]    Another embodied method comprises an analog conversion of the first processed signal to analog prior to the directing of the first processed signal to one of the plurality of receivers, so that the first processed signal that is directed to one of the plurality of receivers is analog. 
         [0009]    Another embodied method comprises the summing of the plurality of aligned signals based on the first training sequence and the plurality of cosite aligned signals based on the cosite training sequence to produce the first processed signal, to includes weighing each aligned signal with a weight factor, and weighing each cosite aligned signal with a cosite weight factor. 
         [0010]    In an embodied method, the cosite weight factor is negative. 
         [0011]    Another embodied method includes directing the cosite training sequence from the combiner to a transmitter for embedding the cosite training sequence to a payload signal to produce a cosite signal, wherein a sample of the cosite signal is the cosite sample signal. In this embodied method, the cosite signal is the cosite interference signal when transmitted via an antenna. 
         [0012]    Another embodied method includes transmitting the cosite interference signal via a cosite transmitting antenna. 
         [0013]    Another embodied method further comprises receiving a second transmitted signal via the plurality of receiving antennas, the second transmitted signal includes a second training sequence. In the embodied method, each of the plurality of received signals further includes the second transmitted signal. The embodied method includes summing the plurality of aligned signals based on the second training sequence and the plurality of cosite aligned signals based on the cosite training sequence to produce a second processed signal, and then directing the second processed signal to one of the plurality of receivers based on the second training sequence. 
         [0014]    Another embodied method further includes detecting and identifying the first training sequence, then channel separation of the first transmitted signal from rest of the received signal by using the first training sequence. The embodied method includes detecting and identifying the second training sequence, then channel separation of the second transmitted signal from rest of the received signal by using the second training sequence. 
         [0015]    Another embodied method includes an analog conversion of the second processed signal to analog prior to the directing of the second processed signal to one of the plurality of receivers, so that the second processed signal that is directed to one of the plurality of receivers is analog. 
         [0016]    In another embodiment, a communication device that reduces cosite interference is provided. A communication device according to an embodiment comprises a plurality of antennas configured to receive signals and direct the signals received to a processing device. 
         [0017]    The embodiment includes the processing device connected to the plurality of antennas, and receives the signals from the plurality of antennas, a transmitter connected to the processing device, wherein the transmitter sends and the processing device receives a cosite sample signal, wherein the cosite sample signal includes a cosite training sequence, and a plurality of receivers connected to the processing device. In the embodiment, the processing device processes the signal to reduce cosite interference using the cosite sample signal and the cosite training sequence to produce a processed signal, the processing device directs the processed signal to one of the plurality of receivers based on the training sequence of the signal, and the one of the plurality of receivers that receives the processed signal. 
         [0018]    In an embodiment, the processing device includes a channel separator that separates at least one signal to different channels based on the training sequence to produce at least one channel separated signal and a cosite interference signal based on the cosite training sequence, and directs the channel separated signal and the cosite interference signal to a matrix adaptive equalizer. The embodiment includes the matrix adaptive equalizer that receives the channel separated signal, the cosite interference signal, and the cosite sample signal, that correlates the cosite training sequence of the cosite interference signal and the cosite training sequence of the cosite sample signal to determine a channel distortion, that processes the channel separated signal to reduce channel distortion, that phase aligns the channel separated signal and the cosite interference signal with respect to each other to produce a processed channel separated signal, and that directs the processed channel separated signal to a combiner. 
         [0019]    In an embodiment, the combiner receives the processed channel separated signal, sums the processed channel separated signal and the cosite sample signal to produce the processed signal, and directs the processed signal to one of the receivers based on the training sequence of the signal. 
         [0020]    In an embodiment, the combiner converts the processed signal to analog prior to directing the processed signal to one of the receivers. Wherein the receiver that receives the analog processed signal is configured to receive analog signals. 
         [0021]    In an embodiment, the processing device includes more than one of the matrix adaptive equalizers. The embodiment includes the combiner that receives plurality of the processed channel separated signals, that sums the processed channel separated signals to produce the processed signal, and directs the processed signal to one of the receivers based on the training sequence of the signal. The embodiment includes a plurality of analog to digital converters that converts signals to digital, each analog to digital converter connected between one of the antennas and one of the matrix adaptive equalizers. 
         [0022]    In an embodiment, the processing device separates at least one signal to different channels based on the training sequence to produce at least one channel separated signal and a cosite interference signal based on the cosite training sequence, correlates the cosite training sequence of the cosite interference signal and the cosite training sequence of the cosite sample signal to determine a channel distortion, processes the channel separated signal to reduce channel distortion, phase aligns the channel separated signal and the cosite interference signal with respect to each other to produce a processed channel separated signal, sums the processed channel separated signal and the cosite sample signal to produce the processed signal, and directs the processed signal to one of the receivers based on the training sequence of the signal. In an embodiment, the transmitter is connected to at least one of the plurality of antennas. 
         [0023]    The transmit/receive switch is connected to the transmitter. The transmit/receive switch is connected to the antenna that is connected to the transmitter. The transmit/receive switch is configured to include a transmit state and a receive state, wherein when the transmit/receive switch is in the transmit state, the antenna connected to the transmitter is configured to transmit the cosite signal, and wherein when the transmit/receive switch is in the receive state, the antenna connected to the transmitter is configured to receive signals. Any number of the plurality of antennas may be configured with a transmit/receive switch accordingly to above. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]      FIG. 1  shows a block diagram of an embodiment. 
           [0025]      FIG. 2  shows a block diagram of an embodiment of a processing device. 
           [0026]      FIG. 3  shows a block diagram of an embodiment. 
       
    
    
     DETAILED DESCRIPTION 
       [0027]    The term “processed” when used describing a signal or as applied to a signal, is defined as affecting the signal via a hardware, a software, or a combination of a hardware and a software, so that the signal has been altered in frequency, phase, or in another way. For example, when a signal has been affected via a hardware and a software so that the signal&#39;s signal-to-noise ratio has been enhanced, that signal has been processed, according to the definition herein. The term “connected” or “connection” is defined herein to include configuration to be in communication with, for example, via a cable, optical fiber, wifi, radio, digital, analog, a combination thereof, including other equivalent devices and methods that would be appreciated by those skilled in the art. The term “sample” when used describing a signal or as applied to a signal, means a copy of the signal, in its entirety or a portion thereof. Generally, a sample of an original signal is substantially the same as the original. It will be understood that when a sample is taken from the original signal, the power of the original signal may be reduced. It will be understood that when a sample is taken from the original signal, the sample&#39;s power may be lower than that of the original signal prior to the sampling. It will also be understood that when a sample is taken from the original signal, for example when optical fiber and optical signals are being used, there may be no loss of power when the sample is compared to the original before and/or after the sampling. 
         [0028]      FIG. 1  shows an embodiment of the communication device that reduces cosite interference. The embodied method will be understood in the description of  FIG. 1 .  FIG. 1  show a communication device  10  that includes a plurality of antennas  101 ,  102 ,  103  configured to receive signals and direct the signals received to a processing device  110 . Although three antennas  101 ,  102 ,  103  are shown in  FIG. 1 , it will be understood that any number of antennas may be included. Example of signals that are received by the plurality of antennas  101 ,  102 ,  103  are a first transmitted signal  11  transmitted from a distant transmitter  21 , and a second transmitted signal  12  transmitted from a distant transmitter  22 . The communication device  10  includes a transmitter  200  that is connected to a transmitting antenna  104  configured to transmit signals  13 . 
         [0029]    The transmitting antenna  104  may also be called a cosite transmitting antenna  104  due to its proximity to the plurality of antennas  101 ,  102 ,  103 . Furthermore, the transmitting antenna  104  may also be called the cosite transmitting antenna  104  due to its connection to the processing device  110 , which is also connected to the plurality of antennas  101 ,  102 ,  103 . Thus, either the proximity and/or the shared feature of being connected to the same processing device  110  makes the transmitting antenna  104  a cosite transmitting antenna  104 . Accordingly, signals transmitted via the cosite transmitting antenna  104  may be called a cosite signal  13 . The transmitter  200  send and the processing device  110  receives a cosite sample signal  120 , wherein the cosite sample signal  120  includes a cosite training sequence. Accordingly, the cosite sample signal  120  may be digital, analog, or a combination of digital and analog. For example, the cosite sample signal  120  may have a digital portion that includes the cosite training sequence, and an analog portion that includes data in analog form, wherein the analog portion is normal to the digital portion. The processing device  110  may be configured to receive a hybrid digital/analog cosite sample signal  120  and use the cosite training sequence to identify the cosite sample signal  120  as the cosite sample signal  120  and use the data in processing other signals, which will be explained further in detail below. 
         [0030]    When the cosite signal  13  is transmitted from the cosite transmitting antenna  104 , the plurality of antennas  101 ,  102 ,  103  receive the cosite signal  13  as a cosite interference signal  13 . Generally, the cosite signal  13  is being transmitted for a distant receiver to receive and not for the plurality of antennas  101 ,  102 ,  103  to receive. Further, generally, the plurality of antennas  101 ,  102 ,  103  will receive, for example, signals  11 ,  12  from a distant transmitter  21 ,  22 . Thus, when the plurality of antennas  101 ,  102 ,  103  receive the signals  11 ,  12 ,  13 , the cosite signal  13  is received as a particularly loud noise over the other signals  11 ,  12 . Thus, the cosite interference signal  13  may substantially reduce the signal-to-noise ratio of signals  11 ,  12  received by the plurality of antennas  101 ,  102 ,  103 . 
         [0031]    Accordingly, as shown in  FIG. 1 , antenna  101  receives the first transmitted signal  11  and cosite interference signal  13  and directs the received signal  31  to the processing device  110 . The first transmitted signal  11  includes a first training sequence. Further, if antenna  101  also receives another signal, the second transmitted signal  12 , then the received signal  31  includes the first transmitted signal  11 , the second transmitted signal  12 , and the cosite interference signal  13 . The second transmitted signal  12  includes a second training sequence. The antenna  101  directs the received signal  31  to the processing device  110 . 
         [0032]    As shown in  FIG. 1 , antenna  102  receives the first transmitted signal  11  and cosite interference signal  13  and directs the received signal  32  to the processing device  110 . Further, if antenna  102  also receives another signal, the second transmitted signal  12 , then the received signal  32  includes the first transmitted signal  11 , the second transmitted signal  12 , and the cosite interference signal  13 . The antenna  102  directs the received signal  32  to the processing device  110 . 
         [0033]    As shown in  FIG. 1 , antenna  103  receives the first transmitted signal  11  and cosite interference signal  13  and directs the received signal  33  to the processing device  110 . Further, if antenna  103  also receives another signal, the second transmitted signal  12 , then the received signal  33  includes the first transmitted signal  11 , the second transmitted signal  12 , and the cosite interference signal  13 . The antenna  103  directs the received signal  33  to the processing device  110 . 
         [0034]    The first transmitted signal  11  may be digital, analog, or a combination of digital and analog. For example, the first transmitted signal  11  may have a digital portion that includes the first training sequence, and an analog portion that includes data in analog form wherein the analog portion is normal to the digital portion. 
         [0035]    The second transmitted signal  12  may be digital, analog, or a combination of digital and analog. For example, the second transmitted signal  12  may have a digital portion that includes the second training sequence, and an analog portion that includes data in analog form wherein the analog portion is normal to the digital portion. 
         [0036]    The processing device may be configured to receive one or more hybrid digital/analog received signals  31 ,  32 ,  33 . The processing device  110  reduces this cosite interference signal  13  from the received signals  31 ,  32 ,  33  and directs the first processed signal  41  to its destined receiver based on the training sequence. The processing device  110  is connected to a plurality of receivers  201 ,  202 ,  203 . Although three receivers  201 ,  202 ,  203  are shown in  FIG. 1 , it will be understood that any number of receivers may be included. Accordingly, the same set of the plurality of antennas  101 ,  102 ,  103  are connected to each of the plurality of receivers  201 ,  202 ,  203  through the processing device  110 . Because the processing device  110  processes the signals received via the plurality of antennas  101 ,  102 ,  103  and directs the received signals to their destined receiver, which is one of the plurality of receivers  201 ,  202 ,  203 , an advantageous ratio of number of antennas to number of receivers may be achieved. 
         [0037]    The processing device  110  processes the received signals  31 ,  32 ,  33  to reduce cosite interference  13  using the cosite sample signal  120  and the cosite training sequence to produce a processed signal  41 ,  42 . Thusly, each processed signal  41 ,  42  has an enhanced signal-to-noise ratio as compared to the received signals  31 ,  32 ,  33  because the cosite interference has been reduced. Further, each processed signal  41 ,  42  may also have an enhanced signal-to-noise ratio as compared to the received signals  31 ,  32 ,  33  because each processed signal  41 ,  42  are a sum of particular signals, for example, the processed signal  41  is shown to be a sum of first transmitted signal  11  from the received signals  31 ,  32 ,  33  via the plurality of antennas  101 ,  102 ,  103 . Thus, the processing device  110  separates at least one received signal to different channels based on the training sequence of the received signal and produces at least one channel separated signal and a cosite interference signal based on the cosite training sequence. Then the processing device correlates the cosite training sequence of the cosite interference signal  13  and the cosite training sequence of the cosite sample signal  120  to determine a channel distortion. Then, the processing device processes the channel separated signal to reduce channel distortion, phase aligns the channel separated signal and the cosite interference signal with respect to each other to produce a processed channel separated signal, sums the processed channel separated signal and the cosite sample signal to produce the processed signal  41 ,  42 , and directs the processed signal  41 ,  42  to one of the receivers  201 ,  202  based on the training sequence of the signal. 
         [0038]    The receivers  201 ,  202  receive the processed signals  41 ,  42 . For example, as shown in  FIG. 1 , if the first processed signal  41  is a processed and equalized version of the first transmitted signal  11 , and the first training sequence on the first transmitted signal  11  indicates that the first transmitted signal  11  is for receiving by receiver  201 , then the processing device  110  directs the first processed signal  41  to and is received by the receiver  201 . For another example, as shown in  FIG. 1 , if the second processed signal  42  is a processed and equalized version of the second transmitted signal  12 , and the second training sequence on the second transmitted signal  12  indicates that the second transmitted signal  12  is for receiving by receiver  202 , then the processing device  110  directs the second processed signal  42  to and is received by the receiver  202 . 
         [0039]      FIG. 1  also shows a feedback loop  51  of the cosite training sequence to adjust a payload signal  52  from the transmitter. The processing device  110  directs the cosite training sequence from the processing device  110  towards the transmitter  200  for embedding the cosite training sequence to the payload signal  52  to produce a cosite signal  53 , the cosite signal  53  prior to being transmitted via the antenna  104 , wherein once transmitted, the cosite signal  53  is the cosite interference signal  13  when received by the cosite receiving antennas  101 ,  102 ,  103 . The payload signal  52  may be analog or digital. The cosite training sequence is embedded to the payload signal  52  to produce the cosite signal  53 . The cosite signal  53  may be digital or a combination of digital and analog, wherein the analog portion includes the analog cosite data from the payload signal  52 . The cosite training sequence being embedded normal to the analog portion. The embedding may be performed with an embedding device  205  as shown in  FIG. 1 . Alternatively, the embedding may be performed via software  205 , or a combination of hardware and software  205 . A sample of the cosite signal  53  is the cosite sample signal  120 , and wherein the cosite signal  53  is the cosite interference signal  13  when transmitted via the antenna  104 . 
         [0040]      FIG. 2  shows an embodiment of a processing device  300 . The processing device  300  shown in  FIG. 2  may replace or be included in the communication devices  110 ,  505  shown in  FIG. 1  and/or  FIG. 3 . 
         [0041]    The processing device  300  equalizes received signals  302 ,  303 ,  304  and processes the received signals  302 ,  303 ,  304  to reduce cosite interference. Each received signal  302 ,  303 ,  304  has its unique channel distortions and time/phase delay due to various reasons, for example, different types of hardware, different lengths of cables, different quality in shielding, etc. One skilled in the art will understand that these factors and many others can cause different channel distortions for each signal pipeline. Thus, each signal pipeline may have its own unique channel distortion. For an array or matrixed systems, to resolve these unique channel distortions, there is a hardware solution wherein all the hardware are designed to reduce the uniqueness of the channel distortions. An example of one hardware solution is using matched cables. The processing device  300  shown in  FIG. 2  does not require this kind of a hardware solution. The processing device  300  processes the received signals  302 ,  303 ,  304  to correct for each of their unique channel distortion. 
         [0042]    The processing device  300  applies the cosite sample signal  301  directly to equalize the received signals  302 ,  303 ,  304 . The cosite sample signal  301  includes a cosite training sequence. Accordingly, the cosite sample signal  301  may be digital, analog, or a combination of digital and analog. For example, the cosite sample signal  301  may have a digital portion that includes the cosite training sequence, and an analog portion that includes data in analog form, wherein the analog portion is normal to the digital portion. The processing device  300  may be configured to receive a hybrid digital/analog cosite sample signal  301 , for example, an analog to digital converter  305  is included in the processing device  300  in  FIG. 2 . However, it will be understood where the processing device is configured for digital cosite sample signal  301  only, then the analog to digital converter  305  is not required to be included in the processing device  300 . Accordingly, a separate figure is not needed for one skilled in the art to understand such an embodiment. 
         [0043]      FIG. 2  is shown with a plurality of analog to digital converters  306 ,  307 ,  308  that receive the received signals  302 ,  303 ,  304 . This is because the embodiment of the processing device  300  shown in  FIG. 2  is for when the received signals  302 ,  303 ,  304  are a combination analog/digital hybrid signals. However, a digital version of the processing device  300  configured to receive digital receiving signals  302 ,  303 ,  304  may be substantially be the same as that shown in  FIG. 2 , absent the analog to digital converters  302 ,  303 ,  304 . Accordingly, a separate figure is not needed for one skilled in the art to understand such an embodiment. 
         [0044]    Each received signal  302 ,  303 ,  304  includes a first transmitted signal, a second transmitted signal, and a cosite interference signal. It will be understood that a plurality of transmitted signals and cosite interference signals are possible. The first transmitted signal has an embedded first training sequence. The second transmitted signal has an embedded second training sequence. The cosite interference signal has an embedded cosite training sequence. 
         [0045]    The processing device includes channel separators  401 ,  402 ,  403  that separates the received signals  302 ,  303 ,  304  based on the detected training sequences embedded on the received signals  302 ,  303 ,  304  so that the first transmitted signal  310 ,  313 ,  316 , the second transmitted signal  312 ,  315 ,  318 , and the cosite interference signal  311 ,  314 ,  317  are channel separated for individual processing. Only three channels are shown in  FIG. 2 , but it will be understood that many more channels are possible and envisioned.  FIG. 2  shows the received signal  302  being processed by the channel separator  401  so that the first transmitted signal  310  the second transmitted signal  312  and the cosite interference signal  311  are channel separated for individual processing.  FIG. 2  shows the received signal  303  being processed by the channel separator  402  so that the first transmitted signal  313  the second transmitted signal  315  and the cosite interference signal  314  are channel separated for individual processing.  FIG. 2  shows the received signal  304  being processed by the channel separator  403  so that the first transmitted signal  316  the second transmitted signal  318  and the cosite interference signal  317  are channel separated for individual processing. Each channel separated signals  310 ,  311 ,  312 ,  313 ,  314 ,  315 ,  316 ,  317 ,  318  are directed to a matrix adaptive equalizer  404 ,  405 ,  406 . 
         [0046]      FIG. 2  shows three matrixed adaptive equalizers  404 ,  405 ,  406 , that processes channel separated signals  310 ,  311 ,  312 ,  313 ,  314 ,  315 ,  316 ,  317 ,  318 . Only three channels are shown for each matrixed adaptive equalizer  404 ,  405 ,  406  in  FIG. 2 , but it will be understood that many more channels for each matrixed adaptive equalizer  404 ,  405 ,  406  are possible and envisioned. 
         [0047]    The matrix adaptive equalizers  404 ,  405 ,  406  receives the channel separated signals  310 ,  311 ,  312 ,  313 ,  314 ,  315 ,  316 ,  317 ,  318  and the cosite sample signal  301  and correlates the cosite training sequence of the cosite interference signal  311 ,  314 ,  317  and the cosite training sequence of the cosite sample signal  301  to determine a channel distortion. The matrix adaptive equalizer then processes the other channel separated signals  310 ,  312 ,  313 ,  315 ,  316 ,  318  to reduce channel distortion on those signals to produce equalized signals. Then, the matrix adaptive equalizers  404 ,  405 ,  406  phase aligns all of the channel separated signals or now equalized signals  310 ,  311 ,  312 ,  313 ,  314 ,  315 ,  316 ,  317 ,  318  with respect to each other to produce processed channel separated signals or aligned signals  320 ,  321 ,  322 ,  323 ,  324 ,  325 ,  326 ,  327 ,  328  and then directs the aligned signals  320 ,  321 ,  322 ,  323 ,  324 ,  325 ,  326 ,  327 ,  328  towards the combiners  407 ,  408 . 
         [0048]    In one embodiment, as shown in  FIG. 2 , the aligned signals  320 ,  321 ,  322 ,  323 ,  324 ,  325 ,  326 ,  327 ,  328  are each weighed with an individual weight factor to produce weighed aligned signals  330 ,  331 ,  332 ,  333 ,  334 ,  335 ,  336 ,  337 ,  338  and then the weighed aligned signals are directed towards the combiners  407 ,  408 . The weight factor applied to the signals  321 ,  324 ,  327  that are the processed versions of the cosite interference signals may be negative. 
         [0049]    For example, producing a processed channel separated signal  320 ,  321 ,  322 ,  323 ,  324 ,  325 ,  326 ,  327 ,  328  may include equalization of the signals wherein the equalization is performed by detecting the unique channel distortion for each received signals  302 ,  303 ,  304 , wherein a non-square Hermitian Matrices are derived on the training sequences and then applied to the inverse of the signals. 
         [0050]    For example, producing a processed channel separated signal  320 ,  321 ,  322 ,  323 ,  324 ,  325 ,  326 ,  327 ,  328  may include correlating the cosite training sequence of the cosite interference signal and the cosite training sequence of the cosite sample signal  301  to determine the unique channel distortion for each received signals  302 ,  303 ,  304 . 
         [0051]    The combiners  407 ,  408  receive certain processed channel separated signals or aligned signals  320 ,  321 ,  322 ,  323 ,  324 ,  325 ,  326 ,  327 ,  328 , and sums received signals to produce the processed signals  409 ,  411 . The combiners  407 ,  408  then directs each processed signal  409 ,  411  to one of the receivers  410 ,  412  based on the training sequence of the processed signal  409 ,  411 . 
         [0052]    As shown in  FIG. 2 , weighed aligned signals  330 ,  331 ,  332 ,  333 ,  334 ,  335 ,  336 ,  337 ,  338  are directed to the combiners  407 ,  408 . The weighed aligned signals  330 ,  333 ,  336  being the processed channel separated signals of the first transmitted signal received from the received signals  302 ,  303 ,  304  are sent to the combiner  407 . The weighed aligned signals  331 ,  334 ,  337  being the processed channel separated signals of the cosite interference signal received from the received signals  302 ,  303 ,  304  are sent to the combiner  407 . 
         [0053]    The combiner sums the weighed aligned signals and produces the processed signal  409  and directs the processed signal  409  to the receiver  410  based on the training sequence embedded on the signals  310 ,  313 ,  316 . 
         [0054]    Also as shown in  FIG. 2 , weighed aligned signals  330 ,  331 ,  332 ,  333 ,  334 ,  335 ,  336 ,  337 ,  338  are directed to the combiners  407 ,  408 . The weighed aligned signals  330 ,  333 ,  336  being the processed channel separated signals of the first transmitted signal received from the received signals  302 ,  303 ,  304  are sent to the combiner  407 . The combiner sums the weighed aligned signals and produces the processed signal  409  and directs the processed signal  409  to the receiver  410  based on the training sequence embedded on the signals  310 ,  313 ,  316 . 
         [0055]    Although not shown in  FIG. 2 , for the case wherein the receivers are configured to receive analog signals only, one or more of the combiners  407 ,  408  may be configured to convert one or more of the processed signal  409 ,  411  to analog prior to directing the processed signal  409 ,  411  to one of the analog receivers. Alternately, the processed signal  409 ,  411  may be sent to a digital to analog converter (not shown) prior to being directed to an analog receiver. 
         [0056]    From the processed signal  409 ,  411  a feedback loop  420 ,  421  may be directed towards the transmitter by sampling the cosite training sequence. The feedback loop  420 ,  421  may be directed from the combiner to the transmitter for embedding the cosite training sequence to a payload signal to produce a cosite signal, wherein a sample of the cosite signal is the cosite sample signal, and wherein the cosite signal is the cosite interference signal when transmitted via an antenna. 
         [0057]      FIG. 3  shows another embodiment of the communication device that reduces cosite interference, similar to the embodiment shown in  FIG. 1 . The embodied method will also be understood in the description of  FIG. 3 .  FIG. 3  show a communication device  500  that includes a plurality of antennas  501 ,  502 ,  503 ,  504  configured to receive signals and direct the signals received to a processing device  505 . Although four antennas  501 ,  502 ,  503 ,  504  are shown in  FIG. 3 , it will be understood that any number of antennas may be included. Example of signals that are received by the plurality of antennas  501 ,  502 ,  503 ,  504  are a first transmitted signal  510  transmitted from a distant transmitter  511 , and a second transmitted signal  512  transmitted from a distant transmitter  513 . The communication device  500  includes a transmitter  520  that is connected to one of the plurality of antennas  501 . 
         [0058]      FIG. 3  shows a feedback loop  522  of the cosite training sequence directed from the processing device  505  to adjust a payload signal  524  from the transmitter. The processing device  505  directs the cosite training sequence from the processing device  505  towards the transmitter  520  for embedding the cosite training sequence to the payload signal  524  to produce a cosite signal  526 . The payload signal  524  may be analog or digital. The cosite training sequence is embedded to the payload signal  524  to produce the cosite signal  526 . The cosite signal  526  may be digital or a combination of digital and analog, wherein the analog portion includes the analog cosite data from the payload signal  524 . The cosite training sequence being embedded normal to the analog portion. The embedding may be performed with an embedding device  528  as shown in  FIG. 3 . Alternatively, the embedding may be performed via software  528 , or a combination of hardware and software  528 . A sample of the cosite signal  526  is the cosite sample signal  530  that is directed to the processing device  505 . The cosite signal  526  is directed towards the antenna  501 . 
         [0059]      FIG. 3  shows a transmit/receive switch  532  connected to the transmitter  520 .  FIG. 3  shows the transmit/receive switch  532  the antenna  501  that is also connected to the transmitter  520 . The transmit/receive switch  532  is configured to include a transmit state and a receive state, wherein when the transmit/receive switch is in the transmit state, the antenna  501  connected to the transmitter is configured to transmit the cosite signal  526 , and wherein when the transmit/receive switch is in the receive state, the antenna  501  connected to the transmitter is configured to receive signals. It will be understood that any of the other antennas  502 ,  503 ,  504  may also be provided with a transmit/receive switch and be connected to the transmitter  520  (configuration not shown). When the transmit/receive switch  532  is in the transmit state, the cosite signal  525  may be transmitted via the antenna  501  as a cosite interference signal  540  which is received by the cosite receiving antennas  502 ,  503 ,  504 . The cosite signal  525  is prior to being transmitted via the antenna  501 , wherein once transmitted, the cosite signal  525  is the cosite interference signal  540   
         [0060]      FIG. 3  shows the antenna  502  receiving the first transmitted signal  510  and cosite interference signal  540  and directs the received signal  541  to the processing device  505 . The first transmitted signal  510  includes a first training sequence. Further, if antenna  502  also receives another signal, the second transmitted signal  512 , then the received signal  541  includes the first transmitted signal  510 , the second transmitted signal  512 , and the cosite interference signal  540 . The second transmitted signal  512  includes a second training sequence. The received signal  541  from the antenna  502  is directed to the processing device  505 . 
         [0061]    Also shown in  FIG. 3 , antenna  503  receives the first transmitted signal  510  and cosite interference signal  540  and directs the received signal  542  to the processing device  505 . Further, if antenna  503  also receives another signal, the second transmitted signal  512 , then the received signal  542  includes the first transmitted signal  510 , the second transmitted signal  512 , and the cosite interference signal  540 . The received signal  542  from the antenna  503  is directed to the processing device  110 . 
         [0062]    Also shown in  FIG. 3 , there is an antenna  504  that receives the first transmitted signal  510  and cosite interference signal  540  and directs the received signal  543  to the processing device  505 . Further, if antenna  504  also receives another signal, the second transmitted signal  512 , then the received signal  543  includes the first transmitted signal  510 , the second transmitted signal  512 , and the cosite interference signal  540 . The received signal  543  from the antenna  504  is directed to the processing device  110 . 
         [0063]    The first transmitted signal  510  may be digital, analog, or a combination of digital and analog. For example, the first transmitted signal  510  may have a digital portion that includes the first training sequence, and an analog portion that includes data in analog form wherein the analog portion is normal to the digital portion. 
         [0064]    The second transmitted signal  512  may be digital, analog, or a combination of digital and analog. For example, the second transmitted signal  512  may have a digital portion that includes the second training sequence, and an analog portion that includes data in analog form wherein the analog portion is normal to the digital portion. 
         [0065]    The processing device  505  may be configured to receive one or more hybrid digital/analog received signals  541 ,  542 ,  543 . The processing device  505  reduces this cosite interference signal  540  from the received signals  541 ,  542 ,  543  and directs the first processed signal  550  to its destined receiver  551  based on the training sequence. The processing device  505  is connected to a plurality of receivers  551 ,  552 ,  553 . Although only three receivers  551 ,  552 ,  553  are shown in  FIG. 3 , it will be understood that any number of receivers may be included. Accordingly, the same set of the plurality of antennas  501 ,  502 ,  503 ,  504  are connected to each of the plurality of receivers  551 ,  552 ,  553  through the processing device  505 . Because the processing device  505  processes the signals received via the plurality of antennas  501 ,  502 ,  503 ,  504  and directs the received signals to their destined receiver, which is one of the plurality of receivers  551 ,  552 ,  553 . 
         [0066]    The processing device  505  processes the received signals  541 ,  542 ,  543  to reduce cosite interference using the cosite sample signal  530  and the cosite training sequence to produce a processed signal  550 ,  555 . Thusly, each processed signal  550 ,  555  has an enhanced signal-to-noise ratio as compared to the received signals  541 ,  542 ,  543  because, for example, the cosite interference has been reduced. The processing device directs the processed signal  550 ,  555  to one of the plurality of receivers  551 ,  552  based on the training sequence of the signal. 
         [0067]    Further, each processed signal  550 ,  555  may also have an enhanced signal-to-noise ratio as compared to the received signals  541 ,  542 ,  543  because each processed signal  550 ,  555  are a sum of particular signals, for example, the processed signal  550  is shown in  FIG. 3  to be a sum of first transmitted signal  510  from the received signals  541 ,  542 ,  543  via the plurality of antennas  502 ,  503 ,  504 . The processing device  505  separates at least one received signal to different channels based on the training sequence of the received signal and produces at least one channel separated signal and a cosite interference signal based on the cosite training sequence. Then the processing device correlates the cosite training sequence of the cosite interference signal  540  and the cosite training sequence of the cosite sample signal  530  to determine a channel distortion. Then, the processing device processes the channel separated signal to reduce channel distortion, phase aligns the channel separated signal and the cosite interference signal with respect to each other to produce a processed channel separated signal, sums the processed channel separated signals to produce the processed signal  550 ,  555  and directs the processed signal  550 ,  555  to one of the receivers  551 ,  552  based on the training sequence of the signal. 
         [0068]    The receivers  551 ,  552  receive the processed signals  550 ,  555 . For example, as shown in  FIG. 3 , if the first processed signal  550  is a processed and equalized version of the first transmitted signal  510 , and the first training sequence on the first transmitted signal  510  indicates that the first transmitted signal  510  is for receiving by receiver  551 , then the processing device  505  directs the first processed signal  550  to and is received by the receiver  551 . For another example, as shown in  FIG. 3 , if the second processed signal  555  is a processed and equalized version of the second transmitted signal  512 , and the second training sequence on the second transmitted signal  512  indicates that the second transmitted signal  512  is for receiving by receiver  552 , then the processing device  505  directs the second processed signal  555  to and is received by the receiver  552 . 
         [0069]    Preferred embodiments have been described. Those skilled in the art will appreciate that various modifications and substitutions are possible, without departing from the scope of the invention as claimed and disclosed, including the full scope of equivalents thereof.