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An optimal power allocation scheme for the STC hybrid-ARQ over energy limited networks

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4 Author(s)
Hongbo Liu ; Dept. of Electr. & Comput. Eng., Rutgers Univ., North Brunswick, NJ, USA ; Razoumov, L. ; Mandayam, N. ; Spasojevic╠ü, P.

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.

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Wireless Communications, IEEE Transactions on  (Volume:8 ,  Issue: 12 )