关键词: 认知无线电, 双向中继, 最大化系统生存时间, 中继选择

Abstract:

A relay node selection strategy was proposed to improve the long-term throughput and extend the lifetime of system. Based on decode-and-forward relay protocol, the secondary user was pretended as a relay node of the primary system to assist the primary user pair to communicate. Meanwhile, data transmission for the secondary system was achieved. The proposed strategy introduces three factors, i.e. the transmit power required for each data transmission, the remaining energy of relay nodes as well as the probability of system outage. Therefore, the long-term throughput can be improved and the lifetime of system can be extended effectively.

Key words: cognitive radio, two-way relaying, lifetime maximization, relay selection