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Optimum joint Adaptive Modulation and Coding and Power Control for packet transmission over fading channels using the ARQ protocol

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3 Author(s)
Selmi, A. ; MEDIATRON Lab., Univ. of Carthage, Tunis, Tunisia ; Siala, M. ; Boujemaa, H.

Mobile radio communication systems employ either Adaptive Modulation and Coding (AMC) combined with an Automatic Repeat reQuest (ARQ) protocol, or Power Control (PC) to handle channel variations, but never a combination of these link adaptation techniques. In this paper we propose a novel scheme which optimally combines PC with AMC, using the ARQ protocol. More specifically, the optimal power level and the appropriate modulation and coding set (MCS) are jointly determined, as a function of the fading channel conditions, to achieve the highest average throughput efficiency, for a fixed average transmit power constraint. To assess the offered performance gain, the proposed technique is compared to a conventional system using exclusively the AMC technique. Numerical results show that the proposed scheme provides significant average transmit power gains. In particular, for a given average throughput, no less than 2 dB gain in transmitted power is achieved, yielding a substantial decrease in interference to other systems/users.

Published in:

Information Science, Signal Processing and their Applications (ISSPA), 2012 11th International Conference on

Date of Conference:

2-5 July 2012