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Cross-layer design of enhanced AMC with truncated ARQ protocols

Qi, J. and Aissa, S. (2007) Cross-layer design of enhanced AMC with truncated ARQ protocols. In: IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference. IEEE, pp. 3353-3357.

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To link to this item DOI: 10.1109/GLOCOM.2007.636


Using a cross-layer approach, two enhancement techniques applied for adaptive modulation and coding (AMC) with truncated automatic repeat request (T-ARQ) are investigated, namely, aggressive AMC (A-AMC) and constellation rearrangement (CoRe). Aggressive AMC selects the appropriate modulation and coding schemes (MCS) to achieve higher spectral efficiency, profiting from the feasibility of using different MCSs for retransmitting a packet, whereas in the CoRe-based AMC, retransmissions of the same data packet are performed using different mappings so as to provide different degrees of protection to the bits involved, thus achieving mapping diversity gain. The performance of both schemes is evaluated in terms of average spectral efficiency and average packet loss rate, which are derived in closed-form considering transmission over Nakagami-m fading channels. Numerical results and comparisons are provided. In particular, it is shown that A-AMC combined with T-ARQ yields higher spectral efficiency than the AMC-based conventional scheme while keeping the achieved packet loss rate closer to the system's requirement, and that it can achieve larger spectral efficiency objectives than that of the scheme using AMC along with CoRe.

Item Type:Book or Report Section
ID Code:33454
Uncontrolled Keywords:Nakagami-m fading channels; adaptive modulation and coding; automatic repeat request; constellation rearrangement; cross-layer approach; data packet; diversity gain; enhanced AMC; spectral efficiency; truncated ARQ protocols; Automatic repeat request; Cross layer design; Diversity reception; Fading; Modulation coding; Performance loss; Physical layer; Propagation losses; Protection; Protocols

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