中文摘要：

为提高认知无线电系统的能量效率，避免功率浪费，提出了一种新的性能衡量标准——有效吞吐量收益。在基于感知的系统模型中，以有效吞吐量收益为目标函数，设计了认知用户的传输策略，并研究了认知用户在不同环境下功率传输最优策略的选择问题。仿真结果表明，所提标准的能量效率比传统标准的能量效率有明显提高，有效地缓解了信息传输过程中的能量浪费。

英文摘要：

In order to improve power utilization of cognitive radio networks, and to avoid the waste of power, in this paper,a new performance metric：effective throughput profits, that is. In sensing-based model ,it takes effective throughput as the objective function, designs the transmission policy of cognitive users, and also studies how to choose the transmission policy in different envi- ronment .Our results validate the advantages of our new performance metric in improving power utilization of cognitive radio net- works and effectively relieves the waste of power in the process of information transmission.