Cross-Layer Design of Combining HARQ With Adaptive Modulation and Coding for Nakagami-M Fading Channels
Source: Academy Publisher
In this paper, the authors propose a cross-layer design which combines Adaptive Modulation and Coding (AMC) at the physical layer with a Hybrid Automatic Repeat reQuest (HARQ) protocol at the data link layer to minimize the Packet Error Rate (PER) and maximize the spectral efficiency. By using Markov model to predict the channel condition of next frame according to the second order statistics characteristics of the former frame, they calculate the conditional probability density function and joint probability density function of Signal to Noise Ratio (SNR). Further, they derive the packet error rate and average spectral efficiency in closed-form for transmission over Nakagami-m fading channels.