基于两跳载波配对策略的非再生OFDM中继系统性能优化

该文针对非再生中继方式，分析了基于正交频分复用(OFDM)的两跳中继系统的容量，并推广到发送端具有两根天线采用空时块码(STBC)的情形。以最大化端到端的信息速率为优化准则，提出了非再生两跳载波配对定理，并结合注水定理分别在频域、空域，以及空频二维进行了资源联合优化。仿真结果表明，资源联合优化与传统的平均资源分配相比，显著提高系统容量，且STBC-OFDM能获得更高性能增益。通过子载波配对方案能进一步增强系统性能。

The Performance Optimization for Non-regenerative OFDM Relaying System Based on Two-hop Subcarrier Pairing Strategy

Based on the non-regenerative relaying mode, the capacity of the two-hop relaying system is analyzed based on Orthogonal Frequency Division Multiplex (OFDM), and the analysis is extended to the scenario with two antennas in transmitter using Space Time Block Coding (STBC). Taking the maximum end-to-end data rate as the optimization criterion, the two-hop subcarrier pairing theorem is proposed, and the joint optimization is investigated across frequency domain, space domain as well as space-frequency planar domain respectively combined with the water-filling theory. The simulation results show that the proposed joint optimization scheme can improve the system capacity obviously compared with the uniform resource allocation scheme, and STBC-OFDM scheme can achieve performance gain. The proposed two-hop subcarrier pairing strategy can enhance the system performance further.