Patent ID: 6775332
Filing Date: 2004-08-10
Classification: H04B,H04L

Abstract:
A multi-stage receiver for recovering a traffic signal embedded in samples of a received signal, comprising:a first detection stage capable of processing the samples of the received signal to provide a first estimate of the traffic signal; and a second detection stage connected to said first detection stage, said second detection stage capable of processing the samples of the received signal and the first estimate of the traffic signal to provide a second estimate of the traffic signal, the second estimate being better than the first estimate; said first detection stage comprising: a demodulator for demodulating the samples of the received signal; and a receiver for producing the first estimate of the traffic signal from the output of the demodulator; said second detection stage comprising: a remodulator for producing a remodulated sample stream from the first estimate of the traffic signal, a channel estimator for producing a channel estimate signal from the samples of the received signal and the remodulated sample stream; a second demodulator for demodulating the samples of the received signal; and a coherent receiver for producing the second estimate of the traffic signal from the channel estimate signal and the output of the second demodulator.