Adaptive receiver for multiplex/multi-access communications
First Claim
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1. A method comprising:
- filtering, according to a plurality of variable filter coefficients, a received communication signal in which input data has been differentially encoded using a plurality of nominal symbols;
predicting a symbol based on the filtered signal, as if the input data had been encoded non-differentially in the communication signal; and
updating the plurality of filter coefficients in response to the predicted symbol.
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Abstract
A received communication signal in which input data has been differentially encoded using a number of nominal symbols is filtered according to variable filter coefficients. A symbol is predicted based on the filtered signal, as if the input data had been encoded non-differentially in the communication signal. The filter coefficients are updated in response to the predicted symbol. An example of the differential encoding is differential phase shift keying (DPSK) modulation.
25 Citations
21 Claims
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1. A method comprising:
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filtering, according to a plurality of variable filter coefficients, a received communication signal in which input data has been differentially encoded using a plurality of nominal symbols;
predicting a symbol based on the filtered signal, as if the input data had been encoded non-differentially in the communication signal; and
updating the plurality of filter coefficients in response to the predicted symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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an adaptive filter whose filtering characteristics are controlled by a plurality of variable filter coefficients whose values are updated in response to a signal at an error input, a further input of the filter being coupled to receive a communication signal in which input data has been differentially encoded;
an estimator having an input coupled to an output of the adaptive filter, the estimator being designed to generate nominal symbols that represent input data that has been encoded non-differentially in a signal at its input; and
a subtractor having an output coupled to the error input of the adaptive filter and inputs coupled to the outputs of the estimator and the adaptive filter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An apparatus comprising:
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means for correcting a received, noise-corrupted communication signal in which a plurality of transmitted nominal symbols represent differentially encoded input data and have been corrupted by one of intra-cell and inter-cell interference;
means for generating nominal symbols that represent data which has been encoded non-differentially in a signal, the generation means to generate a plurality of said nominal symbols from the corrected, received communication signal; and
means for adjusting the correction means in response to the corrected, received communication signal and in response to the plurality of nominal symbols. - View Dependent Claims (19, 20, 21)
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Specification