摘要
使用功率和频谱效用损失异步牵制的迭代算法对认知无线电链路发射机端进行动态发射功率控制,改变链路接收机端的信号干扰噪声比,从而得到认知无线电链路的最优功率分布,实现频谱资源的合理利用.为进一步减少认知无线电链路间的干扰,提出一种接入筛选机制.针对认知无线电链路干扰值的不确定性,用干扰值的概率分布进行描述,计算与干扰值概率分布相对应的信息熵,从而选择出接入筛选机制中需要的自适应干扰阈值.仿真结果表明:当认知无线电链路为40条时,该方案使系统中总干扰从3mW降到0.5mW.
Dynamic transmission power control to the transmitters of the cognitive radio links is accomplished by a new iterative algorithm. The power and cost of spectrum utility lost are constrained with each other in the iteration; the signal-to- interference plus noise ratios to the signal received are changed as the iteration pro- gressing, so as to obtain the optimal transmit power distribution to use the spec- trum rationally. In order to reduce the interference among the cognitive radio links, an access screening mechanism is proposed. The interference probability distribu- tion is used to describe the uncertainty of the interference of a cognitive radio link. The information entropy corresponding to the interference probability is calculated to determine the adaptive interference threshold required in the access screening mechanism. Simulation shows that the total interference in the system reduces from 3 mW to 0. 5 mW using the proposed scheme when there are 40 cognitive radio links.
出处
《电波科学学报》
EI
CSCD
北大核心
2013年第5期835-840,共6页
Chinese Journal of Radio Science
基金
上海市教育委员会科研创新项目(No.12ZZ126)
上海师范大学重点学科(DZL126)资助
关键词
认知无线电链路
动态发射功率
频谱效用
干扰阈值
接入筛选机制
cognitive radio link
dynamic transmit power
spectrum utility
inter- ference threshold
access screening mechanism
