MAP receiver for high-speed numerical transmissions through Rayleigh channels which are noisy and dispersive in time and frequency

摘要

The present invention relates to a receiver for high-speed numerical transmissions through Rayleigh channels noisy and dispersive in time and frequency in which an accurate estimate of the channel response is combined in an optimal manner with the received data sequence detection procedure. Specifically the a posteriori probability of the Markov chain of the states of the channel with intersymbolic interference are calculated recursively from the data received and from the updated channel estimate.;The a posteriori probabilities calculated are used in turn by a Kalman estimator to record the channel variations. On the basis of the sequence of the calculated a posteriori probabilities the detection is then calculated symbol by symbol with the highest a posteriori probability having a small decision delay.