Journal ArticleDOI
Time diversity in DPSK noisy phase channels
Y.E. Dallal,Shlomo Shamai +1 more
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The optimum design of the diversity level is discussed and it is concluded that power efficient transmission is feasible even at bit rates comparable with the signal linewidth.Abstract:
Differential phase shift keying (DPSK) in the presence of both additive white Gaussian noise and a phase impairment, modeled by a Brownian motion is considered. A time-diversity scheme is used for mitigating the effects of phase noise. This scheme renders a repetition coding approach where the transmitter sends multiple replicas of each data bit. An upper bound on the bit error probability, relying on a bivariate moment-generating function admitted by certain real functionals of the phase sample-path, is derived. The approach taken yields a trackable analysis, which rigorously adheres the phase noise effects. The impact of an incomplete statistical characterization on the tightness of the resultant bound is addressed. The theory, which is applicable to assess the design and performance of general heterodyned lightwave systems using (delay) differential demodulation (as DPSK and CP-FSK, or continuous phase frequency-shift keying), is exemplified and explicit results for the considered time-diversity DPSK scheme are provided. The optimum design of the diversity level is discussed and it is concluded that power efficient transmission is feasible even at bit rates comparable with the signal linewidth. >read more
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Journal ArticleDOI
Differential modulation diversity
Robert Schober,Lutz Lampe +1 more
TL;DR: It is shown that space diversity increases the effective fading bandwidth, which has a negative influence on performance, and time diversity does not have this disadvantage and is preferable especially for fast fading channels.
Journal ArticleDOI
Analysis methods for optical heterodyne DPSK receivers corrupted by laser phase noise
C.P. Kaiser,M. Shafi,P.J. Smith +2 more
TL;DR: In this paper, two methods for analyzing the effects of phase noise on the performance of an optical heterodyne binary differential (DPSK) system were presented, one using a perturbation solution for filtered phase noise and the other based on moments of random variables.
Journal ArticleDOI
Block differential encoding for rapidly fading channels
TL;DR: Two novel block differential codecs are derived from a time-frequency duality model for time-varying channels, which improve the bandwidth efficiency of BD-I at the price of increased complexity at the receiver, which relies on decision-feedback decoding.
Journal ArticleDOI
Block-differential modulation over doubly selective wireless fading channels
TL;DR: This work derives a generalized block-differential codec and proves that it achieves maximum Doppler and multipath diversity gains, while affording low-complexity maximum-likelihood decoding and shows that existing BD systems over frequency-selective or time- selective channels follow as special cases of this novel system.
Proceedings ArticleDOI
Block differential encoding for rapidly fading channels
TL;DR: A novel block differential codec is derived based on a basis expansion model for time-varying channels, easy to implement, and achieves the maximum possible Doppler diversity.
References
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