Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1993-08-20
1998-04-14
Tse, Young T.
Pulse or digital communications
Receivers
Interference or noise reduction
375285, H04B 110
Patent
active
057402060
ABSTRACT:
A method for reducing distortion of an information symbol in an information symbol sequence. The information symbol sequence is transformed to a channel symbol sequence for modulating a carrier signal. The channel symbol sequence employs an M-ary signalling scheme. A received signal, which includes a channel symbol, a distortion value and a noise value, is demodulated as a received sample. An index value is determined from a previous information symbol interval. Using the index value the method selects an inverse distortion function for processing the received sample. A corrected sample is calculated using the inverse distortion function. The method determines a value of an information symbol, and a respective index, from the corrected sample. The method includes an adaption phase. The adaption phase adapts the nonlinear equalizer using a linear distortion function. The information symbol sequence is transformed to a channel symbol sequence of an M-ary signalling scheme with index value, for modulating a carrier signal. For each index value, the method includes the step of demodulating a training symbol sequence having pure symbol values as an observed sample sequence. A mean squared value and a mean value is calculated of the observed sample sequence. A mean squared value is calculated of the training symbol sequence. A cross correlation value is calculated. At least two simultaneous equations are solved for coefficients.
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Lomp Gary R.
Schilling Donald L.
InterDigital Technology Corporation
Tse Young T.
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