文档介绍：IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 41, NO. 4, NOVEMBER 1992 401
Differential Detection via the Viterbi Algorithm
for Offset Modulation and MSK-Type Signals
Ghassan Kawas Kaleh, Member, IEEE
Abstracf- The paper deals with the differentially coherent binary PSK (BPSK). The reason for this is not only the
reception of two families of constant-envelope signals: the linear extreme simplicity of the receiver, but also its satisfactory
offset quaternary phase shift keying and the binary partial performance.
response continuous phase modulation with index . When the
conventional (PSK-type) differentially coherent detector is used, a Motivated by this ess, some authors [I] have suggested
large performance degradation, compared with that of coherent the use of differentially coherent detection for BCPM. How-
receiver, is observed. The reason for this is the presence of an ever, as it is shown in [5]for the case where the receiver filter
inherent intersymbol interference (ISI) in the signal and also is optimized, the performance of the differentially coherent
noise enhancement and correlation introduced by the receiver receiver of BCPM presents large pared with
filter. We present here a differential detection strategy which
compensates for IS1 and avoids noise enhancement. We start by that of differential BPSK; Fig. 1, below, shows