认知无线电中基于博弈论方法的联合功率速率控制

Joint Power and Rate Control Based on Game-theoretic Approach in Cognitive Radio

在认知无线电网络中,认知用户在满足目标信干比的前提下,采用非合作博弈的方法以降低每个认知用户的发送功率。为解决认知无线电中共享频谱状态下的联合功率和速率控制问题,将系统中次级用户间的关系假定为非合作的竞争性关系,同时考虑次级用户对主用户的干扰容限,提出一种基于次级用户传输时延花费的非合作博弈联合功率速率控制算法,并证明该算法纳什均衡的存在性与唯一性。仿真结果表明,该算法可使用户在使用较小传输功率的情况下获得较高的效用值与较低的传输延时,同时使次级用户对主用户的干扰小于干扰阈值。

In Cognitive Radio（CR）networks,under the premise of cognitive users satisfying the target SINR,in order to reduce each user＇s transmit power,non-cooperative game can be used. This paper studies joint control of power and rate for CR in the underlay type. It assumes the problem between Secondary Users（SUs）as a Non-cooperative Game（NG）,and one joint control of power and rate alogorithm which is based on Delay Cost（DC）of SUs is proposed. It subjects to the tolerable interference limits,and proves the existence and uniqueness of the proposed alogorithm＇s Nash Equilibrium（NE）. Simulation results show that the alogorithm can attain higher utility and lower transmission delay using lower power,and sum interference made by the SUs can not exceed interference threshold.