BER and outage performance of a dual-signal receiver for narrowband BPSK modulated co-channel signals in a Rician fading channel

The paper analyses the performance of a dual-signal receiver in a Rician fading channel. The receiver is designed for simultaneous reception of two narrowband binary phase shift keying (BPSK) modulated co-channel signals, e.g. two desired signals, of different strength. The dual signal receiver consists of two demodulators. The principle of operation is based on separation of both signals using the data signal of the large signal which is estimated by the first demodulator. After cancellation of the large signal, the small signal is demodulated. The bit error rate (BER) and receiver outage performance in the Rician fading channel with additive white gaussian noise are derived for both signals. Numerical results are presented for two receiver structures with different second demodulator: (i) the coherent BPSK demodulator; (ii) the differentially coherent (DPSK) demodulator. It is shown that the dual-signal receiver outperforms the conventional receiver significantly, especially in the interference limited channel with high signal-to-noise ratio