Hitoshi TAKAI
BER Performance of Anti-Multipath Modulation
Scheme PSK-VP and its Optimum Phase-Waveform
Abstract:This paper proposes a new anti-multipath modulation scheme which the
author calls PSK-VP (Phase Shift Keying with Varied Phase) in which a varied
phase-waveform is redundantly imposed on the DPSK timeslot. The relationship
between the phase-waveform and BER is discussed by using an analytical
approach based on special diversity with a continuous branch. A formula-type
BER expression is obtained by the analytical approach and shows the optimum
phase-waveform condition. A convex phase-waveform asymptotically satisfies
the optimum phase-waveform condition as its phase shift peak is increased.
'PSK-VP with a convex phase-waveform' raises the delay difference upper
limit to almost 1 symbol and shows an excellent BER for a multipath fading
whose delay differences are less than the upper limit. A numerical evaluation
also confirms the above results and additionally shows that 4-ary PSK-VP can
nearly double the upper limit as measured in bits, which is about 1.7 bits for
the convex phase-waveform.