Cross-Layer Design Combining Adaptive Modulation and Coding with ARQ on Frequency Domain Subcarrier of OFDM

The system model and the algorithm for a cross-layer design combining the adaptive modulation and coding with ARQ based on frequency domain subcarrier of OFDM is developed at first. And then the effect of high speed move to the performance of that is analyzed. In order to compensate the degraded performance of wireless link due to high-speed move, a novel finite-state Markov channel model is formed to represent the frequency domain subcarrier of OFDM modeled as random process with Nakagami-m fading distribution. A correction of the threshold of modulation and coding scheme and the channel quality information as well as the method for link prediction in Chase combining is investigated. On this foundation, an improved cross-layer design combining of adaptive modulation and coding with H-ARQ is proposed. The computer simulation results reveal that the improved design and modified algorithm has higher average throughput and lower FER than the original one when the terminal moves in high speed.