Cellular communications system receivers
First Claim
1. A method of processing samples of a received signal to produce a demodulated signal, comprising the steps of:
- representing an impulse response matrix for the received signal using a plurality of indirect variables of a linear complex vector;
synchronizing to the received signal samples in dependence upon the indirect variables;
tracking the indirect variables for successive received signal samples;
equalizing the successive received signal samples in dependence upon the tracked indirect variables; and
producing the demodulated signal in response to the equalized received signal samples.
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Accused Products
Abstract
An impulse response matrix of a received signal in a TDMA communications system is approximated using a plurality of indirect variables of a linear complex vector. The indirect variables are used for synchronizing to the received signal and for tracking and frequency offset estimation during successive samples of the received signal, the samples being equalized in dependence upon the indirect variables. A demodulated signal is derived from the equalized received signal samples. Individual synchronization and tracking units, and a single equalizer, can be provided for a two-antenna receiver. Tracking errors can be used to adapt a parameter of the equalizer to reduce interference in the received signal.
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Citations
20 Claims
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1. A method of processing samples of a received signal to produce a demodulated signal, comprising the steps of:
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representing an impulse response matrix for the received signal using a plurality of indirect variables of a linear complex vector;
synchronizing to the received signal samples in dependence upon the indirect variables;
tracking the indirect variables for successive received signal samples;
equalizing the successive received signal samples in dependence upon the tracked indirect variables; and
producing the demodulated signal in response to the equalized received signal samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20)
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12. Apparatus for producing a demodulated signal from samples of a received signal, comprising:
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a synchronization unit responsive to the received signal samples for producing a linear complex vector comprising a plurality of indirect variables having initial values corresponding to a synchronized state;
a tracking unit responsive to the initial values of the indirect variables and to the received signal samples to produce tracked values of the indirect variables for successive received signal samples;
an equalizer responsive to the tracked values of the indirect variables to equalize successive received signal samples;
a feedback path from the equalizer to the tracking unit to facilitate producing the tracked values of the indirect variables by the tracking unit; and
a demodulator responsive to the equalized received signal samples to produce a demodulated signal.
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Specification