关键词: 正交频分多址接入, 中继系统, 解码转发, 最优资源分配;

Abstract:

The problems of the joint subcarrier allocation, power allocation, transmission mode selection and relay selection optimization which maximizes the weighted sum rate are addressed in orthogonal frequency division multiple access-based decode-and-forward(OFDMA-DF) relaying systems. Based on convex optimization theory, an optimal resource allocation algorithm is proposed. The complexity of this algorithm is only linear in the number of subcarriers. Simulation demonstrates that the scheme can achievenot only fair resource allocation but also effective relay utilization that enhances the system capacity through adjusting weighting factors for each user.

Key words: orthogonal frequency division multiple access, relaying system, decode-and-forward, optimal resource allocation, convex optimization