Patent ID: 6944245

Claim:
An iterative method for reducing interference in a desired signal in a GSM communication system using an alternate linear output filter, the method comprising: inputting a burst of data of a received waveform including interference from a channel of the communication system; training the alternate linear output filter with a set of symbols of specific quadrature phase, known a priori, in the burst of data of the received waveform; operating on the received waveform with the alternate linear output filter to alternately linearly equalize the burst of data to provide an estimate of the desired signal; generating log likelihood ratio estimates for a plurality of bits corresponding to the burst of data; selecting a predetermined number of bits from the plurality of bits based upon a predetermined condition of the generated log likelihood ratio estimates associated with the plurality of bits; augmenting the burst of data by assigning values to the selected predetermined number of bits based on the set of symbols of specific quadrature phase; further re-training the alternate linear output filter with the augmented set of symbols; and further re-operating on the received waveform with the alternate linear output filter to alternately linearly equalize the burst of data to provide an improved estimate of the desired signal.