Abstract
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.
Original language | English (US) |
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Article number | 5351683 |
Pages (from-to) | 5718-5722 |
Number of pages | 5 |
Journal | IEEE Transactions on Wireless Communications |
Volume | 8 |
Issue number | 12 |
DOIs | |
State | Published - Dec 2009 |
All Science Journal Classification (ASJC) codes
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics
Keywords
- Energy limited networks
- Geometric programming
- Hybrid ARQ
- Space-time codes