Patent ID: 7149255

Claim:
A receiver apparatus in a communication system including N transmitters and M receivers, with M greater than or equal to N, said receiver being on of said M receivers, said receiver comprising: a reception agent configured to simultaneously receive a superimposition of different messages sent by the N transmitters; a demodulating agent configured to decode a signal received by the reception agent; a channel estimating agent configured to estimate a characteristic of a transmission channel between one of said N transmitters and said receiver, and configured to jointly estimate a characteristic of the transmission channel by using information of all of the different message; and an equalizer filter configured to minimize a mean squared error between an output of said equalizer filter and a corresponding real symbol, said equalizer filter having a feed forward filtering function and a feed back filtering function, wherein the equalizer filter is further configured to produce a bit-error-rate (BER) of less than 10 −3 , when the signal-to-noise (E b /N 0 ) ratio of the signal is greater than 5 dB, and when no error correction is performed.