TY - JOUR
T1 - Low density parity check codes over wireless relay channels
AU - Hu, Jun
AU - Duman, Tolga M.
N1 - Funding Information:
Dr. Duman is the recipient of the National Science Foundation CAREER Award and IEEE Third Millennium medal. He is a senior member of IEEE, and an editor for IEEE Transactions on Wireless Communications.
Funding Information:
Manuscript received February 6, 2006; revised September 1, 2006 and December 11, 2006; accepted December 12, 2006. The associate editor coordinating the review of this paper and approving it for publication was G. Vitetta. The work in this paper was in part supported by National Science Foundation CAREER Award CCR-9984237. This paper was presented in part at IEEE International Symposium on Information Theory, 2006, and in part at the 44th Annual Allerton Conference on Communication, Control and Computing, 2006.
PY - 2007/9
Y1 - 2007/9
N2 - We exploit the capacity approaching capability of low density parity check (LDPC) codes to design coding schemes for relay channels. We consider the classical relay channel model, and the use of both full-duplex relays and half-duplex ones. In addition to the design of practical coding schemes and the development of the appropriate receiver structures, we also exploit the use of average mutual information to characterize the convergence behavior of the proposed systems. Using the convergence predictions and the simulation results, we demonstrate that the proposed LDPC coded relay systems, in particular, with irregular LDPC codes, have the capability to approach the ergodic/outage information rates very closely. This is true for both ergodic fading channels where the Shannon type (constrained, i.e., modulation specific) capacity is considered, and non-ergodic fading channels where the outage capacity provides the appropriate limits of reliable communication. For the (time-division) half-duplex relay schemes, we also discuss the optimization of the time-division parameters, and the bit allocation strategies to improve the system performance further.
AB - We exploit the capacity approaching capability of low density parity check (LDPC) codes to design coding schemes for relay channels. We consider the classical relay channel model, and the use of both full-duplex relays and half-duplex ones. In addition to the design of practical coding schemes and the development of the appropriate receiver structures, we also exploit the use of average mutual information to characterize the convergence behavior of the proposed systems. Using the convergence predictions and the simulation results, we demonstrate that the proposed LDPC coded relay systems, in particular, with irregular LDPC codes, have the capability to approach the ergodic/outage information rates very closely. This is true for both ergodic fading channels where the Shannon type (constrained, i.e., modulation specific) capacity is considered, and non-ergodic fading channels where the outage capacity provides the appropriate limits of reliable communication. For the (time-division) half-duplex relay schemes, we also discuss the optimization of the time-division parameters, and the bit allocation strategies to improve the system performance further.
KW - Fading channels
KW - Low density parity check (LDPC) codes
KW - Mutual information
KW - Relay channels
KW - Turbo codes
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U2 - 10.1109/TWC.2007.06083
DO - 10.1109/TWC.2007.06083
M3 - Article
AN - SCOPUS:35148889294
SN - 1536-1276
VL - 6
SP - 3384
EP - 3394
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 9
ER -