NDLI: Joint noncoherent demodulation and decoding for the block fading channel: a practical framework for approaching Shannon capacity

Content Provider	IEEE Xplore Digital Library
Author	Rong-Rong Chen Koetter, R. Madhow, U. Agrawal, D.
Copyright Year	1972
Abstract	The paper contains a systematic investigation of practical coding strategies for noncoherent communication over fading channels, guided by explicit comparisons with information-theoretic benchmarks. Noncoherent reception is interpreted as joint data and channel estimation, assuming that the channel is time varying and a priori unknown. We consider iterative decoding for a serial concatenation of a standard binary outer channel code with an inner modulation code amenable to noncoherent detection. For an information rate of about 1/2 bit per channel use, the proposed scheme, using a quaternary phase-shift keying (QPSK) alphabet, provides performance within 1.6-1.7 dB of Shannon capacity for the block fading channel, and is about 2.5-3 dB superior to standard differential demodulation in conjunction with an outer channel code. We also provide capacity computations for noncoherent communication using standard phase-shift keying (PSK) and quadrature amplitude modulation (QAM) alphabets; comparing these with the capacity with unconstrained input provides guidance as to the choice of constellation as a function of the signal-to-noise ratio. These results imply that QPSK suffices to approach the unconstrained capacity for the relatively low information and fading rates considered in our performance evaluations, but that QAM is superior to PSK for higher information or fading rates, motivating further research into efficient noncoherent coded modulation with QAM alphabets.
Starting Page	1676
Ending Page	1689
Page Count	14
File Size	798679
File Format	PDF
ISSN	00906778
Volume Number	51
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Demodulation Fading Phase shift keying Quadrature amplitude modulation Code standards Modulation coding Quadrature phase shift keying Channel estimation Iterative decoding Information rates
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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