Design and Optimization of Partial Response Pulse Shape Filter
A method and system for configuring one or both of a transmitter pulse-shaping filter and a receiver pulse-shaping filter to generate a total partial response that incorporates a predetermined amount of inter-symbol interference (ISI), based on one or more defined performance-related variables and one or more set constraints that are applicable to one or both of the transmitter pulse-shaping filter and the receiver pulse-shaping filters. The predetermined amount of ISI is determined based on an estimation process during extraction of data from an output of the receiver pulse-shaping filter, such that performance of total partial response based communication matches or surpasses performance of communication incorporating filtering based on no or near-zero ISI. The configuring may comprise determining optimized filtering configuration, by applying an optimization process which is based on, at least in part, the one or more constraints and the one or more performance-related variables.
1 - 20 . (canceled)
21 . A system comprising:
circuitry comprising a shaping circuit of a transmitter and a front-end circuit of said transmitter, wherein said circuitry is operable to:
determine a model of nonlinearity of said front-end circuit of said transmitter, wherein said model of said nonlinearity is such that application of said model to a signal introduces nonlinear distortion to said signal that approximates nonlinear distortion which would result from said signal being processed by said front-end circuit; and
configure said shaping circuit based on said model of nonlinearity of said front-end circuit.
22 . The system of claim 21 wherein said circuitry is operable to configure said shaping circuit based on a spectral mask with which transmissions by said transmitter are to comply.
23 . The system of claim 21 , wherein said front-end circuit comprises a power amplifier.
24 . The system of claim 21 , wherein said front-end circuit comprises a mixer.
25 . The system of claim 21 , comprising circuitry in said receiver that is operable to perform a sequence estimation process, rather than per-symbol slicing, to recover information from signals received from said transmitter.
26 . The system of claim 25 , wherein said circuitry of said receiver is operable to use said model of nonlinearity of said front-end circuit of said transmitter in said sequence estimation process.
27 . The system of claim 21 , wherein said configuration of said shaping circuit comprises a setting of a number of filter taps.
28 . The system of claim 21 , wherein said configuration of said shaping circuit comprises a setting of coefficients of one or more of said filter taps.
29 . The system of claim 21 , wherein said shaping circuit operates on an output of a mapping circuit of said transmitter.
30 . The system of claim 29 , wherein said mapping circuit outputs QAM symbols.
31 . A method comprising:
performing by circuitry of an electronic communications system:
determining a model of nonlinearity of a front-end circuit of a transmitter of said electronic communication system, wherein said model of said nonlinearity is such that application of said model to a signal introduces nonlinear distortion to said signal that approximates nonlinear distortion which would result from said signal being processed by said front-end circuit; and
configuring a shaping circuit of said transmitter based on said model of said nonlinearity.
32 . The method of claim 31 wherein said configuring said shaping circuit is based on a spectral mask with which transmissions by said transmitter are to comply.
33 . The method of claim 31 , wherein said front-end circuit comprises a power amplifier.
34 . The method of claim 31 , wherein said front-end circuit comprises a mixer.
35 . The method of claim 31 , comprising performing, by circuitry of a receiver of said electronic communication system, a sequence estimation process, rather than per-symbol slicing, to recover information from signals received from said transmitter.
36 . The method of claim 35 , comprising applying, by said circuitry of said receiver, said model of said nonlinearity of said front-end circuit of said transmitter to signals generated by said sequence estimation process.
37 . The method of claim 31 , wherein said configuring said shaping circuit comprises setting a number of filter taps.
38 . The method of claim 31 , wherein said configuring said shaping circuit comprises setting coefficients of one or more of said filter taps.
39 . The method of claim 31 , wherein said shaping circuit operates on an output of a mapping circuit of said transmitter.
40 . The method of claim 39 , wherein said mapping circuit outputs QAM symbols.