摘要
为了提高频谱资源的利用率,提出了一种基于最佳中继选择的干扰受限频谱接入方法。在该方法中,认知用户在对授权用户造成的干扰满足限制条件的前提下,通过认知中继用户的帮助接入到授权频谱当中。以最大化认知系统的速率为目标,推导出了多中继情况下的最佳中继选择算法。得到结论为当认知用户和中继用户以最大功率发射时,最佳中继位置为固定值,仅与认知系统和授权系统的位置有关;当认知用户和中继用户以固定功率发射时,最佳中继位置会随着发射功率的变化而变化。仿真结果表明了该最佳中继选择算法的有效性,且认知系统的传输速率相比于直达链路也有显著的提高。
In order to improve the utilization of spectrum resources,this paper proposes an interference-limited spectrum access strategy based on the optimal relay selection.In this method,the cognitive user accesses the licensed spectrum with the help of cognitive relay under the premise of the restricted interference to primary users.The optimal relay selection algorithm in the multi-relay case is derived to maximize the rate of the cognitive system.It is concluded that when the cognitive users and relay users transmit with the maximum power the optimal relay location is fixed and merely depends on the locations of cognitive users and primary users,and when the cognitive users and relay users transmit with fixed power,the optimal relay location changes with the transmit power.The simulation demonstrates the effectiveness of the optimal relay selection algorithm,and the rate of the cognitive system is also significantly improved compared with direct links.
作者
胡燕妃
任梦梦
翟旭平
HU Yanfei;REN Mengmeng;ZHAI Xuping(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China)
出处
《移动通信》
2020年第7期86-92,共7页
Mobile Communications
基金
国家自然科学基金项目(61171085,61401266)。
关键词
认知无线电
干扰受限
中继选择
频谱接入
cognitive radio
interference-limited
relay selection
spectrum access
