Selection diversity reception based on cross-channel-interference measurement for digital mobile radio

An antenna pattern diversity reception (APDR) system with a selection strategy based on the measurement of cross-channel-interference which has been confirmed to be a linear function of the multipath RMS delay spread, assuming BPSK as an example, is proposed. Theoretical analysis and computer simulation have been performed to study the effects of an APDR system with minimum RMS delay spread branch-selection strategy. It is confirmed that such a system is more effective in reducing the RMS delay spread, broadening the coherence bandwidth, and decreasing bit error ratio (BER) than a system with a conventional maximum signal strength branch-selection strategy in severe frequency-selective fading environments. A field experiment was carried out. Based on the measured data and computer simulation, the proposed system is shown to work well, even in a real urban area