Abstract
In this paper, we propose a new adaptive link layer protocol that consists in adapting packet length and Modulation and Coding Scheme (MCS) to Average Signal to Noise Ratio or instantaneous SNR (ISNR). Adaptive MCS and adaptive packet length offer higher throughput than adaptive MCS and fixed packet length as considered in previous studies. The best strategy is to adapt the MCS and packet length to ISNR. Adaptive MCS and adaptive packet length offer 1-2 dB gains with respect to adaptive MCS and fixed packet length. The proposed adaptive link layer protocol has been implemented by quantizing the SNR on the feedback channel over four bits and yielding close results to unquantized SNR.