The Performance Optimization for Non-regenerative OFDM Relaying System Based on Two-hop Subcarrier Pairing Strategy
Wu Tong① Wang Ying①② Shu Chao① Zhang Ping①②
①(Wireless Technology Innovation Institutes, Beijing University of Posts and Telecommunications, Beijing 100876, China) ②(Key Laboratory of Ubiquitous Wireless Communication, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China)
Abstract：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.
2008, Vol. 30 
