关键词: OFDM-relay, 联合优化, 免疫遗传算法, 子载波配对

Abstract:

Based on the decode-and-forward relaying mode, the joint resource optimization was analyzed for both power and bandwidth in two-hop OFDM-relay system. Taking the maximum end-to-end data rate as optimization criterion, the bandwidth allocation results of the two-hop is presented and the power allocation according to the water-filling algorithm in this situation is also proposed. At the same time, a matching scheme for two-hop sub-carriers was proposed based on the “Immunity Genetic Algorithms”(IGA). The simulation results show that compared with the uniform resource allocation scheme, the proposed joint optimization scheme can improve the system capacity, and the effect from power optimization is stronger than that of bandwidth. The system performance can be enhanced further by the matching scheme for sub-carriers.

Key words: OFDM-relay, joint optimization, IGA, matching sub-carriers