TY - JOUR
T1 - An optimal power allocation scheme for the STC Hybrid-ARQ over energy limited networks
AU - Liu, Hongbo
AU - Razoumov, Leonid
AU - Mandayam, Narayan
AU - Spasojević, Predrag
N1 - Funding Information:
Manuscript received March 8, 2008; revised October 24, 2008 and March 26, 2009; accepted June 2, 2009. The associate editor coordinating the review of this letter and approving it for publication was M. Torlak. H. Liu, N. Mandayam, and P. Spasojević are with WINLAB, Department of Electrical and Computer Engineering, Rutgers University, North Brunswick, NJ 08902 USA (e-mail: {hongbol, narayan, spasojev}@winlab.rutgers.edu). L. Razoumov is with AT&T Labs, 180 Park Ave, Florham Park, NJ 07932, USA (e-mail: [email protected]). The material in this paper was presented in part at Conference on Information Sciences and Systems (CISS) 2004 and CISS 2005. This work was supported in part by the NSF under Grant No. FMF 0429724. Digital Object Identifier 10.1109/TWC.2009.12.080335
PY - 2009/12
Y1 - 2009/12
N2 - In this paper, we show that for STC (Space-Time Coded) Hybrid-ARQ (Automatic Repeat reQuest) schemes with (re)transmission power control over independent Rayleigh block fading channels, the problem of optimizing energy efficiency with a PER (Packet Error Rate) constraint can be solved as a geometric programming problem. The optimum transmit power increases super-linearly with each requested retransmission and the fraction of the average power optimally allocated to each ARQ round only depends on the incremental diversity gain. The energy savings increases with a decrease in the PER targets and decreases with an increase in the diversity gain.
AB - In this paper, we show that for STC (Space-Time Coded) Hybrid-ARQ (Automatic Repeat reQuest) schemes with (re)transmission power control over independent Rayleigh block fading channels, the problem of optimizing energy efficiency with a PER (Packet Error Rate) constraint can be solved as a geometric programming problem. The optimum transmit power increases super-linearly with each requested retransmission and the fraction of the average power optimally allocated to each ARQ round only depends on the incremental diversity gain. The energy savings increases with a decrease in the PER targets and decreases with an increase in the diversity gain.
KW - Energy limited networks
KW - Geometric programming
KW - Hybrid ARQ
KW - Space-time codes
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U2 - 10.1109/TWC.2009.12.080335
DO - 10.1109/TWC.2009.12.080335
M3 - Article
AN - SCOPUS:73049115743
SN - 1536-1276
VL - 8
SP - 5718
EP - 5722
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 12
M1 - 5351683
ER -