TY - JOUR
T1 - Capacity-approaching turbo coding for half-duplex relaying
AU - Zhang, Zheng
AU - Duman, Tolga M.
N1 - Funding Information:
Paper approved by A. H. Banihashemi, the Editor for Coding and Communication Theory of the IEEE Communications Society. Manuscript received September 17, 2005; revised August 28, 2006. The work of T. M. Duman was supported in part by Bilkent University, Bilkent, Turkey. This work was supported in part by the National Science Foundation CAREER Award 9984237.
PY - 2007/10
Y1 - 2007/10
N2 - In this paper, we develop capacity-approaching turbo-coding schemes for half-duplex relay systems as an extension of our previous work on coding for full-duplex relays. We consider the use of specific signal constellations (e.g., binary phase-shift keying) in transmission, develop practical coding schemes to be used at the source and the relay nodes, and describe a suitable information combining technique at the destination node. Unlike the full-duplex relay systems, the destination node does not perform joint decoding of multiple consecutive blocks; instead, it works with one frame at a time. Furthermore, for the half-duplex relaying scheme, the optimization of the length of the listening period for the relay node is an issue. By utilizing information theoretical tools, we perform this optimization and use it in the development of our capacity-approaching coding/decoding schemes. Specifically, when the fraction of time turns out to be less than the transmission rate, the relay node is unable to decode all the information bits transmitted, and a partial decoding approach has to be used. Through a comprehensive set of examples, we observe that the proposed scheme is promising to approach the corresponding information theoretical limits (bounds). In particular, for all the cases studied, we have obtained bit error rates of 10-5 or lower within 1-1.5 dB (in most cases, almost within 1.2 dB) of the constrained capacity under a variety of channel conditions. Extensions of the proposed scheme to coded modulation and to multiple-input multiple-output systems are also described.
AB - In this paper, we develop capacity-approaching turbo-coding schemes for half-duplex relay systems as an extension of our previous work on coding for full-duplex relays. We consider the use of specific signal constellations (e.g., binary phase-shift keying) in transmission, develop practical coding schemes to be used at the source and the relay nodes, and describe a suitable information combining technique at the destination node. Unlike the full-duplex relay systems, the destination node does not perform joint decoding of multiple consecutive blocks; instead, it works with one frame at a time. Furthermore, for the half-duplex relaying scheme, the optimization of the length of the listening period for the relay node is an issue. By utilizing information theoretical tools, we perform this optimization and use it in the development of our capacity-approaching coding/decoding schemes. Specifically, when the fraction of time turns out to be less than the transmission rate, the relay node is unable to decode all the information bits transmitted, and a partial decoding approach has to be used. Through a comprehensive set of examples, we observe that the proposed scheme is promising to approach the corresponding information theoretical limits (bounds). In particular, for all the cases studied, we have obtained bit error rates of 10-5 or lower within 1-1.5 dB (in most cases, almost within 1.2 dB) of the constrained capacity under a variety of channel conditions. Extensions of the proposed scheme to coded modulation and to multiple-input multiple-output systems are also described.
KW - Channel capacity
KW - Cooperative diversity
KW - Half duplex
KW - Information rates
KW - Iterative decoding
KW - Multihop
KW - Multiple-input multiple-output (MIMO)
KW - Relay
KW - Turbo coding
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U2 - 10.1109/TCOMM.2007.906404
DO - 10.1109/TCOMM.2007.906404
M3 - Article
AN - SCOPUS:36248993461
SN - 0090-6778
VL - 55
SP - 1895
EP - 1906
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 10
ER -