Analysis of K-transmit dual-receive diversity with cochannel interferers over a Rayleigh fading channel

Abstract

The need to combat the severe effects of fading and interference in the rapidly increasing number of communication systems providing wireless services has motivated the study of diversity in the presence of interference. Hence the analysis of wireless systems with both transmit and receive diversity and subject to cochannel interference is an important tool for system design. We consider here a K-transmit dual-receive diversity communication system employing K antennas for transmission and two antennas for reception. The desired signal is corrupted by N interfering sources apart from additive white Gaussian noise. The channel is Rayleigh fading. As a result, the channel matrix for the desired signal and the propagation vectors of the interferers have zero-mean complex Gaussian entries; the entries are assumed to be independent and identically distributed. The complex receive weight vector used for combining the received signals is chosen so as to maximize the output signal-to-interference-plus-noise ratio (SINR). From the statistics of the channel matrix and the propagation vectors of the interferers, we derive a closed-form expressionfor the probability density function (p.d.f.) of the maximum output SINR. This p.d.f. can be used to obtain the symbol error probability for different digital modulation schemes.