NDLI: Space-Time Mesh Codes for the Multiple-Access Relay Network: Space vs. Time Diversity Benefits

Content Provider	IEEE Xplore Digital Library
Author	Cheng-Chun Chang Heung-No Lee
Copyright Year	2007
Description	Author affiliation: Univ. of Pittsburgh, Pittsburgh (Cheng-Chun Chang; Heung-No Lee)
Abstract	We consider a wireless multiple access network where the sender nodes are aided by a number of relay nodes. A transmission of bit-messages is completed in two phases: in the first phase each sender node originates its message which is overheard at the relay node, and in the second phase each relay node transmits the parity bit calculated from the overheard bit-messages. The low-density parity-check codes are used at the sender nodes in the time-domain, and the low-density generator-matrix code is formed across the spatial domain. At the access node, the received bits from multiple sender nodes and relay nodes are thus encoded in both the time and the spatial domain. We call this combination a space-time mesh code here. In this paper, an iterative decoding scheme is designed for the mesh code and its BER performance in AWGN, fast Rayleigh fading, and quasi-static Rayleigh fading channels are investigated. We note that there is an important trade-off relation between the time-domain and the spatial domain coding. Namely, the time-domain coding is desired when the channel exhibits fast fading; while the spatial domain coding is preferred when the channel is in quasi-static fading state.
Starting Page	79
Ending Page	83
File Size	2457389
Page Count	5
File Format	PDF
ISBN	9780615153148
DOI	10.1109/ITA.2007.4357565
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-01-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	UCSD
Subject Keyword	Fading AWGN LDGM codes Diversity reception Bit error rate Rayleigh channels Network coding Time domain analysis Parity check codes Relays LDPC codes Iterative decoding
Content Type	Text
Resource Type	Article

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