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中文摘要：
提出了一种优化认知双向中继系统生存时间的中继节点选择策略．基于解码转发型协议，次级用户作为主刖户系统的中继节点对接收信号进行处理，在帮助主用户系统进行数据传输的同时，可实现次级用户系统的数据传输．通过引入每次数据传输所需的发射功率、中继节点剩余能量以及系统中断概率等因素，能有效地提高系统长期吞吐量，延长系统生存时间．
英文摘要：
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 trans- mission for the secondary system was achieved. The proposed strategy introduces three factors, i.e. the transmit p（ probability tern can wer required for each data transmission, the remaining energy of relay nodes as well as the of system outage. Therefore, the long-term throughput can be improved and the lifetime of sysextended effectively.
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