A generalized frequency division multiplexing (GFDM) transceiver system includes a low complex GFDM transmitter with multiple sub-carriers and timeslots having IFFT based modulator for modulating data corresponding to a particular timeslot and different sub-carriers to corresponding sub-carrier frequencies and thereby generating transmittable GFDM data signal, multipath frequency selective fading GFDM channel having uncorrelated channel coefficients corresponding to different paths for transmitting the modulated GFDM data signal and a low complex GFDM receiver configured to operate with said multipath frequency selective fading channel involving channel equalization followed by self-interference equalization to receive the transmitted modulated GFDM data signal and thereby de-modulate the GFDM data signal to obtain the data.

An FDM communication system in which encoding/decoding settings for different sets of tones are specified using index values assigned to different sets of tones by selecting suitable respective values from a fixed set of index values. Each of the specified index values causes the corresponding digital signal processor to use a respective predefined pair of encoding or decoding settings that includes a respective predefined constellation and a respective predefined shaping code. In some embodiments, the used shaping codes are configured to operate as block codes, with the block sizes being selected such that a multi-code frame generated using multiple shaping codes can be matched to exactly one DMT symbol or to a desired number of whole DMT symbols.

An FDM communication system in which encoding/decoding settings for different sets of tones are specified using index values assigned to different sets of tones by selecting suitable respective values from a fixed set of index values. Each of the specified index values causes the corresponding digital signal processor to use a respective predefined pair of encoding or decoding settings that includes a respective predefined constellation and a respective predefined shaping code. In some embodiments, the used shaping codes are configured to operate as block codes, with the block sizes being selected such that a multi-code frame generated using multiple shaping codes can be matched to exactly one DMT symbol or to a desired number of whole DMT symbols.

Methods of performing a multi-disturber alien crosstalk limited signal-to-noise ratio test are provided in which at least one signal-to-alien crosstalk noise ratio is determined for a victim link segment using a composite power spectral density for at least a first of a plurality of disturber link segments. The composite power spectral density comprises a combination of portions of a plurality of power spectral densities that are associated with line rates at which the first of the plurality of disturber link segments may operate.

Methods and systems for interference avoidance in a multi-protocol communication system may comprise receiving signals in a first communications protocol in a first frequency range and preventing interference signals from being generated in said first frequency range by configuring channel usage in a second communications protocol in a second frequency range based on said received signals. The configuring channel usage may include avoiding communicating in taboo channels and the received signals in said first communications protocol and signals in said configured channels in said second communications protocol may be communicated over one or more coaxial cables based on the configured channel usage. The taboo channels may be selected based on said received signals such that interference signals from said second frequency range do not occur in said first frequency range. The first frequency range comprises a cable or satellite television frequency range, or data over cable service interface standard (DOCSIS).

Methods and systems for interference avoidance in a multi-protocol communication system may comprise receiving signals in a first communications protocol in a first frequency range and preventing interference signals from being generated in said first frequency range by configuring channel usage in a second communications protocol in a second frequency range based on said received signals. The configuring channel usage may include avoiding communicating in taboo channels and the received signals in said first communications protocol and signals in said configured channels in said second communications protocol may be communicated over one or more coaxial cables based on the configured channel usage. The taboo channels may be selected based on said received signals such that interference signals from said second frequency range do not occur in said first frequency range. The first frequency range comprises a cable or satellite television frequency range, or data over cable service interface standard (DOCSIS).

Methods (500, 800) and corresponding systems (100, 200, 300, 400, 900) for generating a pilot symbol (330) include providing an M-point parallel transform sequence that is a discrete Fourier transform of a CAZAC sequence (312, 504-508). The M-point parallel transform sequence (312) is distributed (316, 510) to a set of M subcarriers among N subcarriers to form an N-point frequency-domain sequence (318) wherein the M subcarriers are evenly spaced apart. An N-point inverse fast Fourier transform (320, 512) is performed to convert the N-point frequency-domain sequence to an N-point time-domain sequence (322). The N-point time-domain sequence is converted (324, 514) to a serial sequence (326), and a cyclic prefix is added (328, 516) to the serial sequence to form a pilot symbol (330).

Methods (500, 800) and corresponding systems (100, 200, 300, 400, 900) for generating a pilot symbol (330) include providing an M-point parallel transform sequence that is a discrete Fourier transform of a CAZAC sequence (312, 504-508). The M-point parallel transform sequence (312) is distributed (316, 510) to a set of M subcarriers among N subcarriers to form an N-point frequency-domain sequence (318) wherein the M subcarriers are evenly spaced apart. An N-point inverse fast Fourier transform (320, 512) is performed to convert the N-point frequency-domain sequence to an N-point time-domain sequence (322). The N-point time-domain sequence is converted (324, 514) to a serial sequence (326), and a cyclic prefix is added (328, 516) to the serial sequence to form a pilot symbol (330).

A residential gateway connecting an access network to an in-home network includes an access network transceiver configured for a first communication with an access network component via a wireline and an in-home network transceiver configured for a second communication with an in-home network component via the same wireline or at least one further wireline. The residential gateway further includes synchronization circuitry configured to synchronize a timing between the first and the second communication and interference mitigation circuitry configured to mitigate interference between the first and the second communication based on the synchronized timing.

A residential gateway connecting an access network to an in-home network includes an access network transceiver configured for a first communication with an access network component via a wireline and an in-home network transceiver configured for a second communication with an in-home network component via the same wireline or at least one further wireline. The residential gateway further includes synchronization circuitry configured to synchronize a timing between the first and the second communication and interference mitigation circuitry configured to mitigate interference between the first and the second communication based on the synchronized timing.