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中文摘要：
针对认知网络中，认知源和目的都位于同一个主用户的覆盖区内但距离较远的情形，通过使用主用户频段，采用中继在源和目的间建立多跳路由实现通信。给出一种利用位置信息，以优化跳数和总发射功率为目标的中继选择算法；同时给出一种以最大化系统容量为目标、以总发射功率和接收信干比为约束条件的功率分配算法。仿真结果表明，该文算法能够有效降低系统总发射功率和提高系统容量。
英文摘要：
In the case where the source is located within the coverage area of a primary user but far away from destination, the communication can be achieved by establishing a multi-hop router between the user and the source by sharing the frequency band of the primary user. A relay selection algorithm optimizing the number of hops and the total transmit power is proposed based on the location information, and a power allocation algorithm is presented for maximizing the system capacity under the constraints of the total transmit power and the received signal-to-interference ratio. Simulation results show that the algorithm can effectively reduce the total transmit power and improve the system capacity.
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