An efficient technique for cochannel interference suppression in multiuser indoor radio communication systems is presented. The proposed approach makes use of an antenna array in conjunction with an adaptive combiner that employs a training sequence to adjust the receiver to the desired couser. A different training sequence known to the receiver is transmitted periodically with the information sequence of each couser. Signals received at the diversity antennas are weighted and summed to produce a combined signal. The weight coefficients are adjusted such that the reception of the desired signal is enhanced and all interfering signals are attenuated. A complex least-mean-square algorithm based on the method of steepest descent is used for weight adjustment. Computer simulations are presented for a two-antenna system with coherent QPSK (quadrature phase-shift keying) signaling over frequency-nonselective Rayleigh fading channels, and in the presence of a single interferer.

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Conference 41st IEEE Vehicular Technology Conference
Hanna, S.A., El-Tanany, M, & Mahmoud, S.A. (1991). An adaptive combiner for co-channel interference reduction in multi-user indoor radio systems. Presented at the 41st IEEE Vehicular Technology Conference.