Abstract — Assuming perfect channel knowledge at the transmitter, we propose optimal pre-equalization filters (spatial and temporal) that expand on the conventional Time Reversal (TR) and Zero Forcing (ZF) schemes. The filters are designed to minimize ISI and maximize the received power at the intended receiver. The different schemes are compared in terms of bit error rate and the best performance is obtained for TR scheme with additional time filtering. Moreover we show that this scheme can acheive low probability of intercept around the intended receiver. I
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