Antimultipath Techniques for Packet Radio, III: The M'ary Case
SRI INTERNATIONAL MENLO PARK CA
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In previous Packet Radio Technical Notes 1, 2, we have restricted ourselves to consideration of antimultipath techniques for binary signaling. Even with such complex receivers, we have found that multipath-induced intersymbol interference takes a toll of several dB of transmitter power. In the present report, we analyze and simulate the performance of several Mary systems in the multipath environment, and compare them with those of binary system. The fundamental conclusion we come to is that we can do no better in urbansuburban multipath at high 1 Mbps rates than by using the self-adaptive estimator correlator structure of that uses binary DPSK signalling and RAKE reception. The choice between, say 16ary orthogonally keyed RAKE and binary DPSK RAKE lies simply in the following issues The estimatorcorrelator of for binary signalling which must unscramble intersymbol interference so much more complicated than the estimatorcorrelators for 16ary signalling which have no intersymbol interference to consider is to outweigh the natural simplicity of binary transmitter and receiver. Radio communications.
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