Channel coding for co-channel interference suppression in wireless communications

Abstract

Co-channel interference is a major impairment in wireless systems with channel re-use. In practice the performance of time division multiple access (TDMA) and frequency division multiple access (FDMA) systems is limited by a few dominant co-channel interferers. We present channel codes that are matched to an adaptive linear receiver, so that the combination provides interference suppression. It is shown that a simple one symbol parity check code is capable of suppressing one interferer, a repetition code of length N is capable of suppressing N-1 interferers, and a code of K information symbols and N channel symbols is capable of suppressing N/K interferers. With simple parity check codes and repetition codes, the tap settings of an adaptive combiner can be configured using a 20-40 symbol training sequence. Simulations for multiple cells reveal significant capacity improvement is possible.