Adaptive joint detection of co-channel signals for ANSI-136 handsets

In this paper, we propose an adaptive joint detection receiver for co-channel interference cancellation in ANSI-136 handsets. The proposed receiver adaptively mitigates the dominant impairment present in the system: performing two-user joint demodulation in the presence of a dominant interferer and resorting to single-user equalization in a noise or inter-symbol-interference-limited system. The choice for the demodulator is based on the residual impairment power estimates obtained from single-user and joint acquisition using the training symbols of the desired user. Simulation results for a 1900 MHz ANSI-136 system indicate that the adaptive receiver performs well in various environments. By selecting the best demodulator for each slot on the basis of instantaneous channel conditions, the adaptive detector outperforms both single-user and joint detectors in fading channels.