Author(s)

Shu-Ming Tseng, Wei-Shun Lei

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To improve spectrum efficiency (SE), the adaptive modulation and coding (AMC) and automatic repeat request (ARQ) scheme have been combined for MIMO systems. In this paper, we add variable power subject to power constraint in each AMC mode. We use KKT optimization algorithm to get the optimal transmit power and AMC mode boundaries. The numerical results show that the average SE is increased by about 0.5 bps/Hz for 2 × 2 MIMO systems with Nakagami fading with parameter m = 2 when SNR is around 15 dB and the ARQ retransmission is twice.

Transmitter Power Control, Spectrum Efficiency

S. Tseng and W. Lei, "A Cross Layer Optimization Based on Variable-Power AMC and ARQ for MIMO Systems," International Journal of Communications, Network and System Sciences, Vol. 3 No. 5, 2010, pp. 488-493. doi: 10.4236/ijcns.2010.35066.