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To: Peter Ecclesine who wrote (15824)	10/1/1998 1:40:00 PM
From: Bernard Levy	Read Replies (1) \| Respond to of 152472

Hi Peter and Valueman: I beg to differ a little bit with Peter's last message. The per survivor processing (PSP) technique discussed in the VSAT research description need not involve signal prcessing with multiple transmit or receive antennas. PSP is a technique for simplifying maximum likelihood searches by reducing the number of states in Viterbi decoders (see the key paper by Raheli et al.in IEEE Trans. Commun. in Feb 95). My guess is that VSAT's cochannel interference reduction technique actually deodulates all signals (desired and interferers) at the same time, without attempting to reject any. PSP can also be accomplished in the context of multiple antennas, but the key concept remains the same. One aspect of Peter's reply with which I agree completely is that many companies have developed or are developing CCI removal solutions, so VSAT's research will not give it any particular edge. In fact one of my Dept colleagues has started a company based on a CCI removal technology which allows a frequency reuse of 1 (instead of 4 to 7) for GSM cellular systems. The PSP technique investigated by VSAT strikes me as being somewhat of a brute force approach. Of course, I reserve the right to change this opinion when I see details of the research project. Best regards, Bernard Levy