Two MCS Selection Rules in LDPC Coded AMC-OFDM System

A Low Density Parity Check (LDPC) coded Adaptive Modulation and Coding- Orthogonal Frequency Division Multiplexing (AMC-OFDM) system is proposed, and its theory is given in detail. In order to solve the problem that the traditional Modulation and Coding Scheme (MCS) selecting rule improves the performance limitedly, two MCS selecting rules are proposed for the AMC system, in which MCS for an adaptive block is determined by the posteriori Signal-to-Noise-Ratio (SNR) of units in the block. Throughput performance is analyzed for the two rules. Simulation results show that they can bring to much higher throughput than the traditional method when applied in LDPC coded AMC-OFDM system.