CAJ | 학술논문

基于次用户采用的不同分组层策略,分析了认知无线电网络的性能,提出了两种认知无线电网络模型,推导了次用户的丢包率、分组时延、吞吐量以及频谱利用率的表达式.同时通过认知无线电网络的性能仿真验证了理论分析模型的准确性.分析和仿真结果表明:分析模型能准确地评估认知无线电网络的性能;次用户的丢包率、分组时延和频谱利用率随着业务流流入速率的增加而增加;使用认知无线电技术能大大提高频谱利用率;次用户采用不同的分组层策略对频谱利用率的影响很小,而对吞吐量的影响很大.
기우차용호채용적불동분조층책략,분석료인지무선전망락적성능,제출료량충인지무선전망락모형,추도료차용호적주포솔、분조시연、탄토량이급빈보이용솔적표체식.동시통과인지무선전망락적성능방진험증료이론분석모형적준학성.분석화방진결과표명:분석모형능준학지평고인지무선전망락적성능;차용호적주포솔、분조시연화빈보이용솔수착업무류류입속솔적증가이증가;사용인지무선전기술능대대제고빈보이용솔;차용호채용불동적분조층책략대빈보이용솔적영향흔소,이대탄토량적영향흔대.
In this paper, the performances of cognitive radio networks with different packet level policies for se-condary users are analyzed, and two models for cognitive radio networks are proposed to derive the formulas of packet loss ratio, packet delay, throughput and spectrum utilization for secondary users. Moreover, a performance simulation is carried out to evaluate the accuracy of the proposed theoretical models. Analysis and simulation results indicate that (1) the proposed models can accurately evaluate the performance of cognitive radio networks;(2) the packet loss ratio, packet delay and spectrum utilization of secondary users all increase with the arrival rates of servi-ces;(3) cognitive radio networks help to improve the spectrum utilization remarkably;and (4) the difference in packet level policy of secondary users affects the spectrum utilization slightly but it exerts significant effects on the throughput.