Systems and methods to facilitate downstream bandwidth utilization

A cable modem (CM) system for utilizing additional bandwidth is disclosed. The system includes a receiver path, a feedback path, and a feedback receiver. The receiver path is configured to obtain a base signal having a base bandwidth from a downstream signal. The feedback path is configured to obtain an additional signal having an additional bandwidth from the downstream signal and convert the additional signal to a feedback bandwidth. The feedback receiver of a cable modem tuner is configured to process the additional signal using the feedback bandwidth.

FIELD

Various embodiments generally relate to communications and bandwidth utilization.

BACKGROUND

Communication systems use a range of frequencies to modulate information, transmit information, decode information and the like. The range of frequencies, also referred to as bandwidth, can enhance or limit data rate, latency, reliability and the like.

However, the available bandwidth for communication is typically limited. As a result, the available bandwidth can limit communication properties.

The available bandwidth is generally allocated for various tasks, downstream communication, upstream communication, and the like. The bandwidth allocation can be inefficient. For example, there may be unused upstream bandwidth while downstream transmissions are waiting or delayed to insufficient bandwidth.

What is needed are techniques to efficiently utilize available bandwidth for communication.

DETAILED DESCRIPTION

The present disclosure will now be described with reference to the attached drawing figures, wherein like reference numerals are used to refer to like elements throughout, and wherein the illustrated structures and devices are not necessarily drawn to scale. The same reference numbers may be used in different drawings to identify the same or similar elements. In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular structures, architectures, interfaces, techniques, etc. in order to provide a thorough understanding of the various aspects of various embodiments. However, it will be apparent to those skilled in the art having the benefit of the present disclosure that the various aspects of the various embodiments may be practiced in other examples that depart from these specific details. In certain instances, descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the various embodiments with unnecessary detail. Embodiments herein may be related to RAN1, RAN2, 5G and the like.

Cable modems (CMs) are generally used to connect or bridge a local network with a larger network, such as the Internet. The CM is a network bridge that can provide communication over a medium, such as fibre, coaxial, hybrid fibre-coaxial (HFC) and radio frequency over glass (RFoG).

A CM typically includes an analog front end (AFE) and a system on chip (SoC). The CM can be compatible or support a cable modem standard, such as device over cable service interface specification (DOCSIS) and various versions such as 3.0, 3.1, 3.1 Full Duplex and the like.

ACM communication system generally has upstream and downstream bandwidth allocations, which can be specified in various specifications, standards and the like. The upstream communication is generally from a cable modem to a network and the downstream communication is generally from the network to the cable modem. The communication can also be specified as full duplex or half duplex. In full duplex, both upstream and downstream communications happen at the same time. In half duplex operation, there is either upstream or downstream communication.

Techniques are needed to better utilize the bandwidth allocation for CM communication.

One or more embodiments are disclosed that facilitate bandwidth allocation and utilization for communication, including CM communication. The embodiments include using a second receive path for a front end of a CM. The operation of the second receive path can be repurposed or altered to utilize additional bandwidth for downstream communication. The embodiments also include a second receive path that utilizes under-sampling to utilize additional bandwidth for downstream communication.

FIG. 1is a diagram illustrating an architecture100for utilizing bandwidth in a cable modem system in accordance with one or more embodiments. The architecture100can be implemented as an apparatus or system and is provided for illustrative purposes. It is appreciated that additional elements can be included in the architecture, one or more of the included elements can be omitted and one or more the elements can be replaced by a suitable element.

The architecture100can be used with or as part of an analog front end (AFE) for a cable modem (CM) system. The architecture100includes a tuner102and front end paths110.

The front end paths110can include filters, amplifiers and the like and couple an infra-structure to the tuner102. The paths110can include an infra-structure connection (F-conn), a DOCSIS filter, an FDX coupler, an upstream filter, an upstream amplifier or PGA, a downstream filter and the like. The paths110include an upstream path, a feedback receiver path and a downstream path.

The infra-structure can include coaxial, fibre, hybrid-fibre coaxial, and the like. The infra-structure can be connected to other cable modems, network devices and the like.

The tuner102includes an upstream transmitter104, a feedback receiver106and a downstream receiver108.

The tuner102can be configured to operate in accordance with one or more standards or specifications including DOCSIS, DOCSIS 3.0, DOCSIS 3.1, DOCSIS 3.1 FDX and the like.

DOCSIS 3.1 FDX supports full duplex operation (FDX) at frequencies up to 1.2 GHz.

The upstream transmitter(s)104generate signals for upstream transmission on the infrastructure via the upstream path of the paths110. The upstream transmitters104can include an FDX band transmitter, a non-FDX band transmitter and the like.

The feedback receiver106generally receives feedback information related to the upstream transmissions via the feedback path of the paths110. The tuner102is configured to utilize the feedback information to reduce noise, enhance signal to noise ratios for transmission and the like. In one example, the tuner102operates in a full duplex mode and uses the feedback information to perform echo canceling.

The downstream receiver(s)108are configured to receive downstream signals via the downstream path of the paths110. The downstream receivers108provides the received downstream signals to a cable modem chip or silicon on chip (SoC), which then processes the received signals. The downstream receivers108can include a FDX band receiver, a non-FDX band receiver, a D/S band receiver and the like.

The downstream signals utilize a first bandwidth or range of frequencies. For example, the first bandwidth can include frequencies up to 1.2 giga hertz (GHz) in accordance with a standard, such as DOCSIS. It is appreciated that the first bandwidth and use other suitable frequencies or bandwidths.

The tuner102can be configured to operate in an additional or extended bandwidth mode where the feedback receiver106is configured to receive additional downstream signals using additional bandwidth. In this mode, the feedback receiver106is not typically gathering feedback information. Instead, the feedback receiver is configured to receive the additional downstream signals. The additional downstream signals use the additional bandwidth, which can be different or varied from the first bandwidth. In one example, the additional bandwidth includes frequencies from 1.2 GHz to 1.8 GHz. It is appreciated that other frequency ranges or bandwidths are contemplated.

The additional bandwidth mode, in one example, is a variation from the DOCSIS 3.1 FDX mode. In this example, the additional bandwidth mode has half duplex (HDX) operation for downstream for frequencies up to 1.8 GHz.

It is appreciated that suitable variations of the architecture100are contemplated.

FIG. 2is a diagram illustrating an architecture200for utilizing bandwidth in a cable modem system using down-conversion in accordance with one or more embodiments. The architecture200can be implemented as an apparatus or system and is provided for illustrative purposes. It is appreciated that additional elements can be included in the architecture, one or more of the included elements can be omitted and one or more the elements can be replaced by a suitable element.

The architecture200can be used with or as part of an analog front end (AFE) for a cable modem (CM) system. The architecture200includes a tuner102and front end paths110.

The operation of the architecture200is similar to the operation of the architecture100, which can be referenced for additional understanding.

The front end paths110includes feedback receiver path214, which is used and/or configured to operate in the extended/additional bandwidth mode. The feedback receiver106of the tuner102is configured to receive signals at a feedback bandwidth, such as up to 1.2 GHz. Generally, the feedback bandwidth is less than or equal to a receiver bandwidth for the downstream receiver108.

The front end paths110can additionally include a coupler, such as a FDX coupler, and one or more switches to control modes of operation, such as FDX.

The front end paths110are configured to receive signals having an enhanced or additional bandwidth. This bandwidth includes a base or standard bandwidth up to a first frequency, such as 1.2 GHz, and an additional bandwidth from the first frequency to an additional, higher frequency, such as 1.8 GHz.

The front end paths110are configured to pass the base bandwidth to the downstream receiver108of the tuner102using the downstream path of the paths110. The front end paths110are also configured to pass the additional bandwidth to the feedback receiver106using the feedback receiver path214.

The feedback receiver106is typically not configured to handle signals at the additional bandwidth. For example, the feedback receiver106can be limited to signals up to only the first frequency.

The feedback path214is configured to extract or obtain downstream signals in the additional bandwidth. In one example, the feedback path214filter signals to obtain or extract the downstream signals in the additional bandwidth. Additionally, the feedback path214is configured to down-convert the additional downstream signals to be within the feedback bandwidth.

The feedback receiver106is generally configured for operation within the feedback bandwidth and can process the additional downstream signals.

The SoC (not shown) is configured to process the additional downstream signals which are provided to the SoC. The SoC can be configured to receive the additional downstream signals, channelize the additional downstream signals, perform automatic gain control (AGC) compensation on the additional downstream signals, demodulation of the additional downstream channels and the like using additional information provided by the feedback receiver path214. Thus, the path214can be configured to provide original frequencies or bandwidths, down converted frequencies, original channels, filtering values, down-conversion information, and the like to the SoC.

It is appreciated that if an additional downstream channel/signal's original frequency is known, the SoC's phase and frequency tracking circuits can compensate correctly despite the frequency down-conversion.

In one example, as shown inFIG. 2, the feedback path214includes a first filter216(1.2-1.8 GHz filter in this example) and a first amplifier218to the received signal. The first filter216selects the target frequency band or the additional bandwidth, such as 1.2-1.8 GHz. The first amplifier218boosts the signal to compensate for the filters insertion loss and the mixer conversion loss. The path214also includes an IF bandpass filter220, which is configured to filter out undesired/unselected products of the signal mixing and leave only the selected products. The feedback path214also includes a LO crystal222, LO amplifier224and LO filter226, which are an example of suitable circuitry to generate the local oscillator signal. A mixer228facilitates the down-conversion of the additional bandwidth.

In another example, there are two filters in the path214for the additional downstream bandwidth. There can be a challenge around the frequencies in the end of the lower band and the beginning of the upper band. Generally, if the filters pass the same frequencies there is an impact on receive performance due to power division and if a band is rejected by both filters this results in receive performance impact in the band and return loss impact.

The filters of the feedback path214can be configured to mitigate this possible impact on receive performance. The filters can overlap the filter bands and allow some impact on performance in part of the spectrum due to lower power resulting from power being divided between the two filters

The up to 1.2 GHz band may end at 1.2 GHz while the above band may start below 1.2 GHz. The frequencies above 1.2 GHz will be taken from the down-converted band, even if they are partially seen by the downstream receiver

Define a band around 1.2 GHz as a guard band and remove requirements for reception and return loss in the band, allowing sufficient guard band for filter slopes

Non-reflective filter design may help mitigate echoes between the filters and return loss issues

The tuner102can be configured to operate in other modes where the additional bandwidth is not utilized and/or received by the feedback receiver106. In the other modes, the operation of the feedback path214is altered. For example, the feedback path214can be configured to provide feedback information to the feedback receiver106in the other modes, as shown above with the architecture100.

The feedback path214and/or the front end circuitry110can include additional circuitry switches and the like to configure operation of the other modes, such as full duplex (FDX) and the additional/enhanced bandwidth mode. In one example, the additional circuitry is selectably configured to cause the feedback path214to operate in the FDX mode without performing downconversion of the additional bandwidth. The additional circuitry is selectably configured to cause the feedback path214to operate in the extended/additional bandwidth mode where the above downconversion of the additional bandwidth occurs.

FIG. 3is a diagram illustrating an architecture300for utilizing bandwidth in a cable modem system using under-sampling in accordance with one or more embodiments. The architecture300can be implemented as an apparatus or system and is provided for illustrative purposes. It is appreciated that additional elements can be included in the architecture, one or more of the included elements can be omitted and one or more the elements can be replaced by a suitable element.

The architecture300can be used with or as part of an analog front end (AFE) for a cable modem (CM) system. The architecture300includes a tuner102and front end paths110.

The operation of the architecture300is similar to the operation of the architecture100, which can be referenced for additional understanding.

The front end paths110can additionally include a coupler, such as a FDX coupler, and one or more switches to control modes of operation, such as FDX.

The front end paths110includes feedback receiver path312, which is used and/or configured to operate in the extended bandwidth mode. The feedback receiver106of the tuner102is configured to receive signals at a feedback bandwidth, such as up to 1.2 GHz. Generally, the feedback bandwidth is less than or equal to a receiver bandwidth for the downstream receiver108.

The front end paths110are configured to receive signals having an enhanced or additional bandwidth. This bandwidth includes a base or standard bandwidth up to a first frequency, such as 1.2 GHz, and an additional bandwidth from the first frequency to an additional, higher frequency, such as 1.8 GHz.

The front end paths110are configured to pass the base bandwidth to the downstream receiver108of the tuner102using the downstream path of the paths110. The front end paths110are also configured to pass the additional bandwidth to the feedback receiver106using the feedback receiver path312.

The feedback receiver106is typically not configured to handle signals at the additional bandwidth or up to a feedback frequency. For example, the feedback receiver106can be limited to signals up to only the first frequency.

The feedback path312is configured to extract or obtain downstream signals in the additional bandwidth. In one example, the feedback path312filter signals to obtain or extract the downstream signals in the additional bandwidth. Additionally, the feedback path312is configured to under sample the additional downstream signals to be within the feedback bandwidth. In one example, the feedback bandwidth is up to 684 mega hertz (MHz).

The feedback path312can include various filters, bandpass filters, amplifiers, mixers and the like.

In one example, shown inFIG. 3, the feedback path312includes a feedback path filter316.FIG. 3shows the filter316as a 1.2-1.8 GHz filter, however it is appreciated that other filters, frequency ranges and the like can be employed. This filter316is configured to pass a target band or additional bandwidth and reject the other frequencies that may interfere with the reception or alias into the band of interest when sampled. It is appreciated that other filters, elements and the like can be used in the feedback path312.

In order to obtain the additional downstream signals, the feedback receiver106is configured to undersample using a feedback sampling frequency. This sampling frequency of a sampler or analog to digital converter (ADC) is at least twice the frequency of the feedback frequency. Additionally, this feedback sampling frequency can be selected to be high enough to allow for anti-aliasing filter roll off.

It is appreciated that other factors can be utilized for determining the sampling rate including, but not limited to, providing a higher over-sampling ratio.

As an example, if the additional bandwidth is in the 1.2-1.8 GHz range, the feedback sampling rate is in a second (2nd) Nyquist zone and the feedback sampling rate (Fs) should be above 1.8 GHz. Further, assuming a 5 percent roll off bandwidth, the sampling rate is about 1.9 GHz. However, in order to allow for filter roll-off below 1.2 GHz, Fs/2 is less than or equal to about 1.15 GHz, which means that Fs higher edge for undersampling is at about 2.3 GHz for sampling in the 2ndNyquist zone of 1.9 GHz<Fs<2.3 GHz.

The feedback receiver106is generally configured for operation within the feedback bandwidth and can process the additional downstream signals.

The feedback path312and/or the front end circuitry110can include additional circuitry switches and the like to configure operation of the other modes, such as full duplex (FDX) and the additional/enhanced bandwidth mode. In one example, the additional circuitry is selectably configured to cause the feedback path312and the feedback receiver106to operate in the FDX mode without performing undersampling of the additional bandwidth. The additional circuitry is selectably configured to cause the feedback path312to operate in the extended/additional bandwidth mode where the undersampling of the additional bandwidth occurs.

It is further appreciated that the feedback path312can be configured to support a plurality of techniques of utilizing the additional bandwidth. For example, the system300can also include the feedback path214and allow selection of either path. It is appreciated that other suitable variations are contemplated.

FIG. 4is a diagram illustrating an example feedback sampling rate400for a feedback receiver configured to use additional bandwidth in accordance with one or more embodiments. The sampling rate, also designated as Fs, can be used in the architecture300and variations thereof.

Example frequency values and bandwidths are provided for illustrative purposes. It is appreciated that other frequency values and bandwidths can be utilized and are contemplated.

In this example, the feedback receiver106is configured to process or operate in a feedback band or bandwidth of about 108 MHz to 684 MHz. This band is referred to as a first (1st) Nyquist band.

A second (2nd) Nyquist band is determined as from fs/2 up to fs. The feedback path312is configured to have one or more filters to filter the additional band between about 1.2 to 1.8 GHz. In one example, the one or more filters include a 1.2 to 1.8 GHz bandpass filter.

The sampling rate Fs is selected as described above to, as an example, about 1.9 GHz.

The SoC (not shown) can be configured to digitally down-convert and demodulate frequency-inversed data from the feedback receiver including channelization, AGC compensation, demodulation and other functionality of downstream channel reception and the like.

FIG. 5is a diagram illustrating an example cable modem500in accordance with some embodiments. The cable modem500is provided for illustrative purposes and it is appreciated that suitable variations are contemplated.

The cable modem500includes a front end502and a silicon on chip (SoC)504. The front end502and the SoC are connected via an interface.

The cable modem500can be at least partially used with the architectures described above.

The front end502is an analog front end and sends and receives signals via an infrastructure. The infrastructure can include a coaxial cable and the like. The front end502processes received signals and provides these signals to the SoC in digital form using the interface. The front end502also processes signals from the SoC for transmission via the infrastructure.

The CM500and/or the SoC504can be compatible cable modem specifications such as data over cable service interface specification (DOCSIS) versions 3.0, 3.1, 3.1 Full Duplex, and the like. The SoC504includes circuitry to form modulation, demodulation, encoding, decoding, signal processing and the like.

The SoC504can include circuitry configured to utilize additional information from a feedback path, such as the feedback path212, to processes obtained additional signals.

FIG. 6is a flow diagram illustrating a method600of downconverting an additional bandwidth of downstream signals in accordance with one or more embodiments. The method600is provided for illustrative purposes and it is appreciated that suitable variations are contemplated.

The method600can be understood with and in reference to the architectures100-300described above.

The method600begins at block602where a downstream signal is received. The downstream signal can have a plurality of signals. The downstream signal utilizes a total bandwidth that includes a base bandwidth and an additional bandwidth.

A base portion of the received signal is provided to a receiver of a cable modem tuner at block604. The base portion is at or within a base bandwidth.

A feedback path obtains an additional portion of the received signal at block606. The additional portion is at or within an additional bandwidth.

In one example, the total bandwidth is 0 to 1.8 GHz, the base bandwidth is 0 to 1.2 GHz and the additional bandwidth is 1.2 GHz to 1.8 GHz. However, it is appreciated that these bandwidth can utilize other suitable frequency values.

The feedback path downconverts the additional portion of the signal to a feedback bandwidth and generates feedback or downconvert information at block608.

The feedback receiver processes the downconverted signal and the receiver processes the base signal at block610.

The tuner provides the downconverted signal and the base signal to a SoC using an interface at block612.

The SoC processes the downconverted signal and the base signal using the feedback or downconvert information at block614.

It is appreciated that suitable variations of the method600are contemplated. For example, one or more blocks can be omitted and additional blocks, not shown, can also be included.

FIG. 7is a flow diagram illustrating a method700of undersampling an additional bandwidth of downstream signals in accordance with one or more embodiments. The method700is provided for illustrative purposes and it is appreciated that suitable variations are contemplated.

The method700can be understood with and in reference to the architectures100-300described above.

The method700begins at block702where a downstream signal is received. The downstream signal can have a plurality of signals. The downstream signal utilizes a total bandwidth that includes a base bandwidth and an additional bandwidth.

A base portion of the received signal is provided to a receiver of a cable modem tuner at block704. The base portion is at or within a base bandwidth.

A feedback path obtains an additional portion of the received signal at block706. The additional portion is at or within an additional bandwidth.

In one example, the total bandwidth is 0 to 1.8 GHz, the base bandwidth is 0 to 1.2 GHz and the additional bandwidth is 1.2 GHz to 1.8 GHz. However, it is appreciated that these bandwidth can utilize other suitable frequency values.

A sampling rate for undersampling is selected for the feedback receiver based on a feedback bandwidth, the additional bandwidth and the like at block708.

The feedback path undersamples the additional portion of the signal to a feedback bandwidth at block710.

The feedback receiver processes the downconverted signal and the receiver processes the base signal at block712.

The tuner provides the downconverted signal and the base signal to a SoC using an interface at block714.

The SoC processes the downconverted signal and the base signal at block714.

It is appreciated that suitable variations of the method700are contemplated. For example, one or more blocks can be omitted and additional blocks, not shown, can also be included.

As utilized above and herein, terms “component,” “system,” “interface,” and the like are intended to refer to a computer-related entity, hardware, software (e.g., in execution), and/or firmware. For example, a component can be a processor, a process running on a processor, a controller, an object, an executable, a program, a storage device, and/or a computer with a processing device. By way of illustration, an application running on a server and the server can also be a component. One or more components can reside within a process, and a component can be localized on one computer and/or distributed between two or more computers. A set of elements or a set of other components can be described herein, in which the term “set” can be interpreted as “one or more.”

By way of illustration, and not limitation, nonvolatile memory, for example, can be included in a memory, non-volatile memory (see below), disk storage (see below), and memory storage (see below). Further, nonvolatile memory can be included in read only memory, programmable read only memory, electrically programmable read only memory, electrically erasable programmable read only memory, or flash memory. Volatile memory can include random access memory, which acts as external cache memory. By way of illustration and not limitation, random access memory is available in many forms such as synchronous random access memory, dynamic random access memory, synchronous dynamic random access memory, double data rate synchronous dynamic random access memory, enhanced synchronous dynamic random access memory, Synchlink dynamic random access memory, and direct Rambus random access memory. Additionally, the disclosed memory components of systems or methods herein are intended to include, without being limited to including, these and any other suitable types of memory.

Examples can include subject matter such as a method, means for performing acts or blocks of the method, at least one machine-readable medium including instructions that, when performed by a machine cause the machine to perform acts of the method or of an apparatus or system for concurrent communication using multiple communication technologies according to embodiments and examples described herein.

Example 1 is a cable modem (CM) system for utilizing additional bandwidth. The system includes a receiver path, a feedback path, and a feedback receiver. The receiver path is configured to obtain a base signal having a base bandwidth from a downstream signal. The feedback path is configured to obtain an additional signal having an additional bandwidth from the downstream signal and convert the additional signal to a feedback bandwidth. The feedback receiver of a cable modem tuner is configured to process the additional signal using the feedback bandwidth.

Example 2 includes the subject matter of Example 1, including or omitting optional elements, wherein the additional bandwidth is higher than the base bandwidth.

Example 3 includes the subject matter of any of Examples 1-2, including or omitting optional elements, wherein the feedback bandwidth is up to 682 mega hertz (MHz), the additional bandwidth is at about 1.2 giga hertz (GHz) to about 1.8 GHz and the base bandwidth is at about 0 to 1.2 GHz.

Example 4 includes the subject matter of any of Examples 1-3, including or omitting optional elements, further comprising a downstream receiver of the tuner configured to operate at the base bandwidth and to receive the base signal.

Example 5 includes the subject matter of any of Examples 1-4, including or omitting optional elements, further comprising a transmitter of the tuner configured to generate upstream signals for transmission.

Example 6 includes the subject matter of any of Examples 1-5, including or omitting optional elements, wherein the feedback path includes a bandpass filter configured to the additional bandwidth and configured to filter the downstream signal to obtain the additional signal.

Example 7 includes the subject matter of any of Examples 1-6, including or omitting optional elements, wherein the feedback path is configured to down-convert the additional signal from the additional bandwidth to the feedback bandwidth.

Example 8 includes the subject matter of any of Examples 1-7, including or omitting optional elements, wherein the feedback path is configured to facilitate under-sampling the additional signal from the additional bandwidth to the feedback bandwidth.

Example 9 includes the subject matter of any of Examples 1-8, including or omitting optional elements, wherein the feedback receiver is configured to obtain process the additional signal in an additional bandwidth mode and to perform echo cancellation in a full duplex mode.

Example 10 includes the subject matter of any of Examples 1-9, including or omitting optional elements, wherein the tuner is configured to select an undersampling rate for the feedback receiver.

Example 11 includes the subject matter of any of Examples 1-10, including or omitting optional elements, further comprising a system on chip (SoC) configured to channelize the additional signal base on the additional bandwidth.

Example 12 is a cable modem system for utilizing additional bandwidth. The system includes a feedback path and a tuner. The feedback path is configured to filter a downstream signal to obtain an additional signal at an additional bandwidth and convert the additional bandwidth to a feedback bandwidth. The tuner is configured to operate at the feedback bandwidth.

Example 13 includes the subject matter of Example 12, including or omitting optional elements, wherein the feedback path is configured to overlap filter bands and to downconvert the additional signal.

Example 14 includes the subject matter of any of Examples 11-13, including or omitting optional elements, wherein the feedback path is configured to define a guard band at a lower limit of the additional bandwidth.

Example 15 includes the subject matter of any of Examples 11-14, including or omitting optional elements, wherein the feedback path is configured to incorporate a non-reflective filter to mitigate echoes and return loss.

Example 16 includes the subject matter of any of Examples 11-15, including or omitting optional elements, wherein the tuner is configured to select a sampling rate for undersampling based on the additional bandwidth and a feedback bandwidth.

Example 17 is one or more computer-readable media having instructions that, when executed, cause a cable modem to: receive a downstream signal having a total bandwidth from an infrastructure; obtain a base signal from the downstream signal having a base bandwidth; obtain an additional signal from the downstream signal having an additional bandwidth; convert the additional signal to a feedback receiver bandwidth; and process the additional signal.

Example 18 includes the subject matter of Example 17, including or omitting optional elements, wherein the instructions, when executed cause the CM to down-convert the additional signal from the additional bandwidth to the feedback receiver bandwidth.

Example 19 includes the subject matter of any of Examples 17-18, including or omitting optional elements, wherein the instructions, when executed cause the CM to select a sampling rate and under-sample the additional signal at the selected sampling rate.

Example 20 includes the subject matter of any of Examples 17-19, including or omitting optional elements, wherein the instructions, when executed cause the CM to channelize the additional signal using original frequencies of the additional signal.

It is to be understood that aspects described herein can be implemented by hardware, software, firmware, or any combination thereof. When implemented in software, functions can be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media or a computer readable storage device can be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or other tangible and/or non-transitory medium, that can be used to carry or store desired information or executable instructions. Also, any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

For a software implementation, techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform functions described herein. Software codes can be stored in memory units and executed by processors. Memory unit can be implemented within processor or external to processor, in which case memory unit can be communicatively coupled to processor through various means as is known in the art. Further, at least one processor can include one or more modules operable to perform functions described herein.

Single carrier frequency division multiple access (SC-FDMA), which utilizes single carrier modulation and frequency domain equalization is a technique that can be utilized with the disclosed aspects. SC-FDMA has similar performance and essentially a similar overall complexity as those of OFDMA system. SC-FDMA signal has lower peak-to-average power ratio (PAPR) because of its inherent single carrier structure. SC-FDMA can be utilized in uplink communications where lower PAPR can benefit a mobile terminal in terms of transmit power efficiency.

Techniques described herein can be used for various cable modem systems and standards. These standards include, but are not limited to, data over cable service interface specification (DOCSIS) versions 3.0, 3.1 and 3.1 Full Duplex.

Further, the actions of a method or algorithm described in connection with aspects disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or a combination thereof. A software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium can be coupled to processor, such that processor can read information from, and write information to, storage medium. In the alternative, storage medium can be integral to processor. Further, in some aspects, processor and storage medium can reside in an ASIC. Additionally, ASIC can reside in a user terminal. In the alternative, processor and storage medium can reside as discrete components in a user terminal. Additionally, in some aspects, the s and/or actions of a method or algorithm can reside as one or any combination or set of codes and/or instructions on a machine-readable medium and/or computer readable medium, which can be incorporated into a computer program product.