Abstract:
A multimode and multiband MIMO transceiver of W-CDMA, WLAN and UWB communication is disclosed. The transceiver uses four antennas at the transmitter and the receiver. The W-CDMA has a multicarrier for 12 channels with a total of 15 MHz frequency bandwidth and is able to transmit a data rate more than 2 Mbps. The WLAN can transmit and receive the data rate up to 54 Mbps based on OFDM technologies. On the other hand, the UWB communication uses an OFDM-based multicarrier for four-multiband, with each multiband of frequency bandwidth about 512 MHz, and is able to transmit a very high data rate more than 1 Gbps. Thus, the multimode and multiband MIMO transceiver of W-CDMA, WLAN and UWB communication is enable a user to perform multiple tasks in a real-time operation. This multimode and multiband MIMO-based transceiver utilizes a trade-off benefit of W-CDMA, WLAN and UWB communications, thereby having a co-existence of multi-standard for applications in a wireless and fixed wireless communication environment.

Description:
BACKGROUND 
   This invention is generally relative to a multimode and multiband Multiple-Input-Multiple-Output (MIMO) transceiver of Wideband Code Division Multiple Access (W-CDMA), Wireless Local Area Network (WLAN), and Ultra Wideband (UWB) Communications for a wireless and fixed wireless communication. 
   The MIMO is a multiple-input-multiple-output as a wireless link and is also known as a space-time signal processing that a natural dimensional of transmitting data is complemented with a spatial dimension inherent in the use of multiple spatially distributed antennas. The MIMO is able to turn multipath propagations into a benefit for service providers and wireless users. This is because signals on the transmit antennas at one-end and the receiver antennas at the other-end are integrated such that a quality of bit error rate (BER) or a data rate of the communication for each wireless user or a transmitting distance is improved, thereby increasing a communication network&#39;s quality of service. 
   The W-CDMA is a wideband, spread spectrum radio interface that uses CDMA technology to meet the needs for wireless communication systems, which allow subscribers to access World Wide Web or to perform file transfers over packet data connections capable of providing 144 kbps and 384 kbps for mobility, and 2 Mbps in an indoor environment. The W-CDMA (also known as CDMA2000) supports for a wide range of radio frequency (RF) channel bandwidths from 1.25 MHz to 15 MHz with operating of 1.90 GHz band, where the channel sizes of 1, 3, 6, 9, and 15 MHz. The wide channels of the W-CDMA offer any combination of higher data rates, thereby increasing total capacity and/or increasing range. The W-CDMA also employs a single carrier and a multicarrier system, which can be deployed as an overlay over one or more existing the second generation of TIA/EIA-95B 1.25 MHz channels. In the multicarrier system, modulation symbols are de-multiplexed onto N separate 1.25 MHz carrier, where each carrier is spread with a 1.2288 mega-chip per second (Mcps). 
   The WLAN is an IEEE standard for a wireless LAN medium access control (MAC) and physical layer (PHY) specification and is also referred to as the high-speed physical layer (802.11a) in the 5 GHz band. The WLAN standard specifies a PHY entity for an orthogonal frequency division multiplexing (OFDM) system. The RF lower noise amplifier (LAN) communication system is initially aimed for the lower band of the 5.15–5.35 GHz and the upper band of the 5.725–5.825 GHz unlicensed national information structure (U-NII) bands, as regulated in the United States by the code of Federal Regulations under Title 47 and Section 15.407. The WLAN communication system provides the data payload rate of 6, 9, 12, 18, 24, 36, 48 and 54 mega-bit per second (Mbps). Also, the WLAN communication system supports the transmitting and receiving at data rate of 6, 12, and 24 Mbps with mandatory. The WLAN communication system uses 52 subcarriers with modulation of using binary phase shift keying (BPSK) or quadrature phase shift keying (QPSK), 16-quadrature amplitude modulation (QAM), or 64-QAM. The forward error correction (FEC) coding of a convolution encoder is used to perform a coding rate of ½, ⅔, or ¾. 
   U.S. Federal Communications Commission (FCC) released a revision of Part 15 of Commission&#39;s rules with regard to UWB communications to permit the marketing and operation of certain types of new products on Apr. 22, 2002. UWB communication systems can operate using spectrum occupied by existing radio service without causing interference, thereby permitting scare spectrum resources to be used more efficiently. The UWB communication systems can offer significant benefits for Government, public safety, businesses and consumers under an unlicensed basis of operation spectrum. 
   FCC is adapting unwanted emission limits for the UWB communication devices that are significantly more stringent than those imposed on other Part 15 devices. For the indoor UWB operation, FCC provides a wide variety of UWB communication devices, such as high-speed home and business networking devices under the Part 15 of the Commission&#39;s rules subject to certain frequency and power limitations. However, the UWB communication devices must operate in the frequency band ranges from 3.1 GHz to 10.6 GHz, and have an emission of −10 dBm for the UWB operation. In addition, the UWB communication devices should also satisfy the Part 15.209 limit for the frequency band below 960 MHz. Table 1 lists the FCC restriction of the emission masks (dBm) along with the frequencies (GHz) for the UWB communication devices in the indoor environment. 
   
     
       
             
             
             
           
         
             
                 
               TABLE 1 
             
             
                 
                 
             
             
                 
               Frequency (MHz) 
               EIRP (dBm) 
             
             
                 
                 
             
           
           
             
                 
                0–960 
               −41.3 
             
             
                 
                960–1610 
               −75.3 
             
             
                 
               1610–1990 
               −53.3 
             
             
                 
               1990–3100 
               −51.3 
             
             
                 
                3100–10600 
               −41.3 
             
             
                 
               Above 10600 
               −51.3 
             
             
                 
                 
             
           
        
       
     
   
   The UWB communication devices are defined as any devices where the fractional bandwidth is greater than 0.25 based on the formula as follows: 
                   FB   =     2   ⁢     (         f   H     -     f   L           f   H     +     f   L         )         ,           (   1   )               
where f H  is the upper frequency of −10 dBm emission points, and f L  is the lower frequency of −10 dBm emission points. A center transmission frequency F c  of the UWB communication devices is defined as the average of the upper and lower −10 dBm points as follows:
 
                   F   C     =           f   H     -     f   L       2     .             (   2   )               
Furthermore, a minimum frequency bandwidth of 500 MHz must be used for the indoor UWB communication devices regardless of center frequencies.
 
   The UWB communication products can be used for fixed wireless communications within a short-distance range, particularly for a very high-speed data transmission suitable for broadband access to networks in the indoor environment. 
   The multimode and multiband MIMO transceiver of a W-CDMA, WLAN and UWB communication system is disclosed herein according to some embodiments of the present invention. The invented transceiver system is a MIMO-based multimode and multiband portable station of integrating W-CDMA, WLAN, and UWB communications. The portable station employs four antennas at the transmitter and receiver as a MIMO link. During the wireless communications, the W-CDMA in the portable station has a multicarrier for 12 channels with a total of 15-MHz frequency bandwidth at the center of 1.9 GHz frequency band and is able to transmit the data rate more than 2 Mbps. The W-CDMA can be used as a user phone with enable of communicating speech, data, image, and clip video. On the other hand, during the fixed wireless communications, the WLAN in the portable station can transmit and receive the data rate up to 54 Mbps based on an OFDM technology at the unlicensed national information structure (U-NII) bands of the 5.15–5.35 GHz and the upper band of the 5.725–5.825 GHz. The UWB communication in the portable station uses an OFDM-based multicarrier for four-multiband with each multiband of frequency bandwidth about 512 MHz in the frequency range from 3.1 GHz to 5.15 GHz and is able to transmit the data rate at 1.5 Gbps. Since the UWB communication can transmit and receive a very-high data rate but with a very short-distance range while the WLAN is able to transmit and receive the lower data rate in a much longer distance range than the UWB communication. Thus, a combination of W-CDMA, WLAN, and UWB communications in a specific portable device is enable a user to have internet surf, to listen MP3 music, to watch DVD, to play video game, to view stock graph, to transmit data with other devices in a real-time operation. Therefore, a trade-off benefit of W-CDMA, WLAN, and UWB communications can be utilized each other, thereby having a co-existence of the multimode and multiband portable station with multiply applications in a multiply environment. 
   The present invention of the multimode and multiband MIMO transceiver of W-CDMA, WLAN, and UWB communications utilizes both benefits of a wireless phone and a fixed wireless broadband communication. Such a multimode device not only can transmit the packet data in a form of wireless phone environment but also can use as a very-high speed wireless broadband Internet device to transmit and receive data, image, video, video game, music, and stock graph in a real-time. Therefore, there is a continuing need of the multimode and multiband MIMO transceiver of W-CDMA, WLAN, and UWB communication system for delivering a very-high data rate with flexibility and scalability capabilities in a combination form of wireless and fixed wireless environments. 
   SUMMARY 
   In accordance with one aspect, a multimode and multiband MIMO transceiver of W-CDMA, WLAN and UWB communication comprises: (1) the MIMO-based multimode and multiband RF unit including W-CDMA, WLAN and UWB connected to a multiple antenna unit in which includes N antennas, where N is an integer and greater than 1; (2) the MIMO-based multimode and multiband RF unit connected to a WLAN and UWB OFDM processor in which coupled to a sharing memory bank, an interleaver, and a W-CDMA, WLAN, and UWB control processor coupled to a coding processor; (3) the MIMO-based multimode and multiband RF unit connected to a W-CDMA Rake and baseband processor in which coupled to the sharing memory bank, the interleaver, and the W-CDMA, WLAN, and UWB control processor; (4) the MIMO-based multimode and multiband RF unit connected to the sharing memory bank in which coupled to the WLAN and UWB OFDM processor, the W-CDMA Rake and baseband processor, and the W-CDMA, WLAN, and UWB control processor; (5) the MIMO-based multimode and multiband RF unit connected to the W-CDMA, WLAN, and UWB control processor in which coupled to the sharing memory bank, the W-CDMA Rake and baseband processor, the WLAN and UWB OFDM processor, the interleaver and the coding processor; (6) the interleaver coupled to the W-CDMA, WLAN, and UWB control processor, the W-CDMA Rake and baseband processor, the WLAN and UWB OFDM processor, and the coding processor; and (7) the coding processor coupled to the interleaver and the W-CDMA, WLAN, and UWB control processor. 
   Other aspects are set forth in the accompanying detailed description and claims. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a block diagram of showing a multimode and multiband MIMO transceiver of W-CDMA, WLAN and UWB communication according to some embodiments. 
       FIG. 2  is a detailed block diagram of showing a multimode and multiband RF receiver section of W-CDMA, WLAN and UWB communication according to some embodiments. 
       FIG. 3  is a detailed block diagram of showing a tri-mode analog-to-digital (A/D) converter unit according to some embodiments. 
       FIG. 4  is a detailed block of showing a W-CDMA rake-based baseband processor according to some embodiments. 
       FIG. 5  is a detailed block diagram of showing a dual-mode WLAN and UWB OFDM processor according to some embodiments. 
       FIG. 6  is a detailed block diagram of showing a dual-mode WLAN and UWB Fast Fourier transform (FFT) and frequency-domain equalizer (FEQ) unit according to some embodiments. 
       FIG. 7  is a detailed block diagram of showing a multiband UWB digital receiver filter, despreading, and time-domain equalizer (TEQ) unit according to some embodiments. 
       FIG. 8  is a detailed block diagram of showing an UWB FFT and FEQ unit according to some embodiments. 
       FIG. 9  is a frequency spectrum output of the multiband UWB communication system according to one embodiment. 
       FIG. 10  is a block diagram of showing an implementation flowchart for multimode and multiband MIMO transceiver of W-CDMA, WLAN, and UWB communication according to some embodiments. 
   

   DETAILED DESCRIPTION 
   Some embodiments described herein are directed to the multimode and multiband MIMO transceiver of W-CDMA, WLAN, and UWB communication for the wireless and fixed wireless communication. Such the multimode and multiband MIMO transceiver system may be implemented in hardware, such as in an Application Specific Integrated Circuits (ASIC), digital signal processor, field programmable gate array (FPGA), software, and/or a combination of hardware and software. 
   Transceiver System and Architecture 
   Portable station architecture of the multimode and multiband MIMO transceiver of W-CDMA, WLAN, and UWB communication system  100  for the wireless and fixed wireless communication is shown in  FIG. 1  in accordance with one embodiment of the present invention. The portable station architecture of the multimode and multiband MIMO transceiver includes a multimode and multiband RF unit of W-CDMA, WLAN, and UWB communication  120 , a W-CDMA rake and baseband processor  130 , a dual-mode WLAN and UWB OFDM processor  140 , an interleaver/deinterleaver unit  150 , a coding/decoding processor  160 , a sharing memory bank  170 , and a tri-mode control processor of W-CDMA, WLAN and UWB  180 . The multimode and multiband RF unit of W-CDMA, WLAN, and UWB communication  120 , which is coupled to four identical and independent antennas of  110   a  to  110   d , is used to convert baseband signals of W-CDMA, WLAN or UWB into RF signals for a transmitter and/or convert RF signals of W-CDMA, WLAN and UWB into baseband signals for a receiver. During W-CDMA mode, the multimode and multiband RF unit of W-CDMA, WLAN, and UWB communication  120  connects to a W-CDMA rake and baseband processor  130 , which deals with a rake processing, a scramble/descramble, and a spreading/dispreading. The W-CDMA rake and baseband processor  130  is coupled to a tri-mode interleaver unit  150  that performs an interleaver and deinterleaver for W-CDMA signals. The tri-mode interleaver unit  150  is connected with a tri-mode coding processor  160  that is used to perform encoding and/or decoding for a user data stream. During a WLAN or UWB mode, the multimode and multiband RF unit of W-CDMA, WLAN, and UWB communication  120  connects to a dual-mode WLAN and UWB OFDM processor  140 , which performs a time-domain equalizer (TEQ), an OFDM, a frequency-domain equalizer (FEQ), and/or a multiband spreading/despreading. The dual-mode WLAN and UWB OFDM processor  140  is coupled to the tri-mode interleaver unit  150 , which performs an interleaver and deinterleaver for WLAN or UWB signals. The tri-mode interleaver unit  150  is connected with a tri-mode coding processor  160  that is used to perform encoding and/or decoding for a user data stream during WLAN or UWB communications. The control processor  180  of W-CDMA, WLAN and UWB is used to control frame data flows with exchanging between all of the processors of  130 ,  140 , and  160 , and units of  120 ,  150  and the sharing memory bank  170 . 
   The portable station system and architecture  100  of the multimode and multiband MIMO transceiver of W-CDMA, WLAN, and UWB communication is used for the wireless and fixed wireless communication. For the wireless communication, the portable station system and architecture  100  can transmit and receive the W-CDMA data rate stream from 144 kbps to greater than 2 Mbps, and supports for a range of RF channel bandwidths including 1.25 MHz, 3.75 MHz, 7.5 MHz, 11.25 MHz, and 15 MHz at the center frequency of 1.9 GHz. For the fixed wireless communication, the portable station system and architecture  100  can be used either as a WLAN transceiver or as an UWB transceiver. During WLAN mode, the portable station system and architecture  100  can transmit and receive the WLAN data rate up to 54 Mbps at the unlicensed national information structure (U-NII) bands of the 5.15–5.35 GHz and the upper band of the 5.725–5.825 GHz. During UWB mode, the portable station system and architecture  100  is used to transmit and receive the UWB data rate up to 1.5 Gbps based on OFDM-based multicarrier and multiband of frequency bandwidth in the frequency range from 3.1 GHz to 5.15 GHz, with an enhancement of transmitting range due to use of the multiple antennas. 
   Receiver Architecture 
   Referring to  FIG. 2  is a detailed block diagram  200  of showing the multimode and multiband RF unit of W-CDMA, WLAN, and UWB communication  120  according to some embodiments. Four analog bandpass filters of  210   a  to  210   d  connect to four low noise amplifiers (LNA) of  220   a  to  220   d , followed by four automatic gain controls (AGC) of  230   a  to  230   d . Setting parameters of the analog bandpass filters of  210   a  to  210   d , the LNA of  220   a  to  220   d , and the AGC of  230   a  to  230   d  is controllable according to one of modes for W-CDMA, WLAN, or UWB communication. The output signals of the AGC of  230   a  to  230   d  are then added together by using a sum over a block  240 . During W-CDMA mode, the output W-CDMA signals of the sum over a block  240  is connected with a W-CDMA down converter and demodulation  260  by using a selection switch  252  in a switch unit  250 . Thus, the W-CDMA down converter and demodulation  260  produces two I and Q baseband analog signals, g 1  and g 2 , for a tri-mode A/D converter unit  290 . The tri-mode A/D converter unit  290  produces two digital baseband signals of au 1  and au 2 . During WLAN mode, the output WLAN signals of the sum over the block  240  are connected with a WLAN down converter and demodulation  270  by using the selection switch  252  in the switch unit  250 . The WLAN converter and demodulation of  270  produces two I and Q baseband analog signals, w 1  and w 2 , for the tri-mode A/D converter unit  290 . The tri-mode A/D converter unit  290  produces two digital baseband signals of au 1  and au 2 . During UWB mode, the output UWB signals of the sum over the block  240  are connected to a multiband UWB down converter and demodulation  280  by using the switch  252  in the switch unit  250 . The multiband UWB down converter and demodulation  280  produces eight I and Q baseband analog signals, u 1 , u 2 , . . . , u 8  for the tri-mode A/D converter unit  290 . The tri-mode A/D converter unit  290  produces eight digital baseband signals of au 1 , au 2 , . . . , au 8 . 
   Referring to  FIG. 3  is a detailed block diagram  300  of showing the tri-mode A/D converter unit  290  according to some embodiments. There are two switch units of  310  and  320  and eight A/D converters of  330   a  to  330   h , with a sampling frequency rate at 540 MHz. During W-CDMA mode, a switch  312  of a switch unit  310  and a switch  322  of a switch unit  320  connect to the input signals of g 1  and g 2 , respectively. The outputs of the switch units of  310  and  320  are passed into two A/D converters of  330   a  and  330   b , with the sampling rate at 540 MHz. This is an over-sampling for the W-CDMA signals. Other A/D converters of  330   c  to  330   h  are rest. The output signals au 1  and au 2  of the A/D converters of  330   a  and  330   b  are used for the W-CDMA rake and baseband processor. During the WLAN mode, the switch  312  of the switch unit  310  and the switch  322  of the switch unit  320  connect to the input signals of w 1  and w 2 , respectively. The outputs of the switch units of  310  and  320  are passed into two A/D converters of  330   a  and  330   b , with the sampling rate at 540 MHz. This is an over-sampling for the WLAN signals. Other A/D converters of  330   c  to  330   h  are rest. The output signals au 1  and au 2  of the A/D converters of  330   a  and  330   b  are used for the dual-mode WLAN/UWB baseband processor. During UWB mode, the switch  312  of the switch unit  310  and the switch  322  of the switch unit  320  connect to the input signals of u 1  and u 2 , respectively. The outputs of the switch units of  310  and  320  along with other six input signals of u 3  to u 8  are in parallel passed into eight A/D converters of  330   a  and  330   h , with the sampling rate at 540 MHz. The output signals of au 1  to au 8  of the A/D converters of  330   a  to  330   h  are used for the dual-mode WLAN/UWB baseband processor. 
   Referring to  FIG. 4  is a detailed block diagram  400  of showing the W-CDMA rake and baseband processor  130  according to some embodiments. Two input digital signals of au 1  and au 2  are passed through two digital receiver filters of  410   a  to  410   b , followed by two down-sampling of  420   a  to  420   b . A combination of digital receiver filter  410   a  and the down-sampling  420   a , and a combination of the digital receiver filter  410   b  and the down sampling  420   b  are to form two digital decimation filters, respectively. The outputs of the down-sampling of  420   a  to  420   b  are multiplexed together by using a MUX  430 . The output of the MUX  430  is despread with a sequence from a despreader generator  442 . The despread signals of a spreader  440  output are passed through a rake receiver unit  450 . Then, the output of the rake receiver unit  450  is descrambled with a sequence of a descrambler coder generator  462  by using a spreader  460 . The output of the spreader  460  is used for deinterleaver. 
     FIG. 5  is a detailed block diagram  500  of showing a dual-mode WLAN and UWB OFDM processor  140  according to some embodiments. During WLAN operation, the input signals of au 1  and au 2  are passed into a WLAN digital decimation channel select filter unit  510 , which produces desired digital downsampled signal sequence. By connecting a switch  532  to a position of “a” in a switch unit  530 , the output of the WLAN digital decimation channel select filter unit  510  is passed through a dual-mode WLAN and UWB, serial-to-parallel (S/P) and guard removing unit  540  to produce 64 parallel signals for a dual-mode WLAN and UWB FFT and FEQ unit  542 . The WLAN and UWB FFT and FEQ unit  542  performs 64-point FFT and FEQ operation followed by a parallel-to-serial (P/S) unit  546  to convert  64  parallel signals into a serial output signal. On the other hand, during UWB operation, the input signals from au 1  to au 8  are passed into a multiband UWB digital receiver filter despreading and TEQ unit  520  to produce 4 parallel signals. The first output signal s 1  connects to the dual-mode WLAN and UWB S/P and guard-removing unit  540  to produce 1024 parallel signals by connecting the switch  532  into a position “b” in the switch unit  530 . Then, the 1024 output signals of the dual-mode WLAN and UWB S/P and guard-removing unit  540  pass through the dual-mode WLAN and UWB FFT and FEQ unit  542  to produce 512 parallel signals for the P/S unit  546 , which converts 512 parallel signals into a serial signal for a P/S unit  560 . Other output signals of s 2  to s 4  from the multiband UWB digital receiver filter, despreading and TEQ unit  520  in parallel pass three S/P and guard removing units of  550   b  to  550   d . Each of S/P and guard removing units of  550   b  to  550   d  produces 1024 parallel signals for FFT and FEQ units of  552   b  to  552   d  followed by P/S units of  554   b  to  554   d  to produce a serial signal. Then the P/S unit  560  converts the output signals of the P/S unit  546 , and the P/S unit  554   b – 554   d  to produce one single output signal in which is despreaded with a sequence from a user key generator  580  by using a spreader  570 . 
     FIG. 6  is a detailed block diagram  600  of showing a dual-mode WLAN and UWB FFT and FEQ unit  542  according to some embodiments. This unit includes a 1024-point FFT  610 , a WLAN/UWB mode  660 , 500 equalizers  620   a   1  to  620   a   500 , 500 decision detectors  630   a   1  to  630   a   500 , 500 subtracts  640   a   1  to  640   a   500 , and an adaptive algorithm  650 . During WLAN mode, the 1024-point FFT  610  only performs 64-point FFT operation under controlling by the WLAN/UWB mode  660 . The 64 equalizers  620   a   1  to  620   a   64 , 64 decision detectors  630   a   1  to  630   a   64 , and 64 subtracts  640   a   1  to  640   a   64  are used along with the adaptive algorithm  650  to update the equalizer taps. Thus, the dual-mode WLAN and UWB FFT and FEQ unit  542  produces 64 parallel output signals. During UWB mode, the 1024-point FFT  610  has 1024 inputs and produces 512 outputs, which are used for 500 equalizers  620   a   1  to  620   a   500 , 500 decision detectors  630   a   1  to  630   a   500 , and 500 subtracts  640   a   1  to  640   a   500 . The adaptive algorithm  650  is used to adjust the equalizer taps. The adaptive algorithm is one type of algorithms including a least mean square (LMS), a recursive least squares (RLS) or a constant modulus algorithm (CMA). As a result, in this case, the dual-mode WLAN and UWB FFT and FEQ unit  542  produces 500 parallel output signals. 
     FIG. 7  is a detailed block diagram  700  of showing the multiband UWB digital receiver filter, despreading and TEQ unit  520  according to some embodiments. The input UWB signals au 1  to au 2  in parallel pass through eight digital receiver filters  710   a   1  and  710   a   2 , to  720   d   1  and  720   d   2 . Each of the digital receiver filters  710   a   1  and  710   a   2  to  720   d   1  and  720   d   2  is followed by one of spreading unit  720   a   1  and  720   a   2  to  720   d   1  and  720   d   2  to perform a despreading operation. Each of despreading sequences is generated by each of multiband despreading units  730   a  to  730   d , respectively. Then, the output despreaded signals of the spreading units  720   a   1  and  720   a   2  are multiplexed together by using a MUX  740   a , followed by using a time-domain equalizer (TEQ)  750   a . In a similar way, the output despreaded signals of the spreading units  720   d   1  and  720   d   2  are multiplexed together by using a MUX  740   d , followed by using a TEQ  750   d.    
     FIG. 8  is a detailed block diagram  800  of showing a FFT and FEQ unit  552  (for  552   b  to  552   d ) according to some embodiments. This unit includes a 1024-point FFT  810 , 500 equalizers  820   a   1  to  820   a   500 , 500 decision detectors  830   a   1  to  830   a   500 , 500 subtracts  840   a   1  to  840   a   500 , and an adaptive algorithm  850 . The 1024-point FFT  810  has 1024 inputs and produces 512 outputs in which are used for 500 equalizers  820   a   1  to  820   a   500 , 500 decision detectors  830   a   1  to  830   a   500 , and 500 subtracts  840   a   1  to  840   a   500 . The adaptive algorithm  850  is used to adjust the equalizer taps. Thus, the FFT and FEQ unit  552  produces 500 parallel output signals for UWB mode. 
   UWB Output Spectrums 
     FIG. 9  is an output UWB frequency spectrum  900  of a multimode and multiband MIMO transceiver of W-CDMA, WLAN and UWB communication transmitter, including four multi-frequency band spectrums of 920, 930, 940 and 950 according to some embodiments. A FCC emission limitation  910  for UWB operation is also shown in  FIG. 9 . Each transmitter frequency bandwidth of all the multi-frequency band spectrums of 920, 930, 940 and 950 is 512 MHz and is fitted under the FCC emission limitation  910  with different carrier frequencies. The detail positions of each transmitter multi-frequency band spectrums (dBm) along with the center, lower and upper frequencies (GHz) as well as the channel frequency bandwidth (MHz) are listed in Table 1: 
   
     
       
             
             
             
             
             
           
         
             
               TABLE 1 
             
             
                 
             
             
                 
               Center 
               Lower 
               Upper 
               Frequency 
             
             
               Multichannel 
               Frequency 
               Frequency 
               Frequency 
               Bandwidth 
             
             
               Label 
               (GHz) 
               (GHz) 
               (GHz) 
               (MHz) 
             
             
                 
             
           
           
             
               920 
               3.357 
               3.101 
               3.613 
               512 
             
             
               930 
               3.869 
               3.613 
               4.125 
               512 
             
             
               940 
               4.381 
               4.125 
               4.637 
               512 
             
             
               950 
               4.893 
               4.637 
               5.149 
               512 
             
             
                 
             
           
        
       
     
   
   Implementation Flowchart in the Receiver 
     FIG. 10  is a block diagram  1000  of showing an implementation flowchart for a multimode and multiband MIMO receiver of W-CDMA, WLAN and UWB communications according to some embodiments. In a receive mode  1020 , the output of the receiver mode  1020  passes through a W-CDMA  1030  to determine whether a received signal is W-CDMA, WLAN or UWB. If the received signal is W-CDMA, the multimode and multiband MIMO receiver is then to complete the following steps: 1) set W-CDMA parameters of bandpass filter, LNA and AGC  1050 ; 2) switch to W-CDMA down converter and demodulation  1052 ; 3) select two A/D converters  1054  for W-CDMA signals; 4) set W-CDMA parameters for deinterleaver and decoding  1056 . If the received signal is WLAN, then, the multimode and multiband MIMO receiver is to accomplish the following steps: 1) set WLAN parameters of bandpass filter, LNA and AGC  1062 ; 2) switch to WLAN down converter and demodulation  1064 ; 3) select two A/D converters for WLAN signals; and 4) set WLAN parameters for FFT, FEQ, deinterleaver and decoding  1068 . If the received signal is UWB, then, the multimode and multiband MIMO receiver is to finish the following steps: 1) set UWB parameters of bandpass filter, LNA and AGC  1072 ; 2) switch to UWB down converter and demodulation  1074 ; 3) select eight A/D converters  1076  for UWB signals; 4) set UWB parameters for FFT, FEQ, deinterleaver and decoding  1078 . 
   While the present inventions have been described with respect to a limited number of embodiments, those skilled in the art will appreciate numerous modifications and variations therefrom. It is intended that the appended claims cover all such modifications and variations as fall within the true spirit and scope of these present inventions.