AN ADAPTIVE SWITCHING ECHO CANCELLATION DIVERSITY RECEPTION FOR AN FMBROADCASTING RECEIVER IN MULTIPATH MOBILE CHANNEL

In the multipath mobile channel, the received signal suffers from both the fluctuation in the received field intensity caused by fading and waveform distortion caused by the echo. Diversity reception using mult iple spaced antennas is an effective method to compensate for fading, while echo cancellation with an adaptive an ay is good at compensating for waveform distortion. In this paper, an adaptive switching echo ca ncellation/diversity reception method to compensate for both waveform distortion and fading is proposed. The proposed switching reception mo nitors the impacts of channel conditions on received signal and then o ne of an echo canceller and a diversity receiver is selected according ly to compensate the channel. The compensation performance of the prop osed switching reception in terms of both average DUR (Desired to Unde sired signal Ratio) and the probability of DUR below a threshold value is investigated with computer simulation. The results show that the a daptive switching echo cancellation/diversity reception has realized t he advantages of both adaptive echo cancellation and diversity recepti on.