计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2015年
16期
97-102
,共6页
认知无线电%协作频谱感知%系统效用%优化分析%感知时长
認知無線電%協作頻譜感知%繫統效用%優化分析%感知時長
인지무선전%협작빈보감지%계통효용%우화분석%감지시장
cognitive radio%cooperative spectrum sensing%system utility%optimization analysis%sensing duration
协作频谱感知可以提升认知无线电的频谱感知能力,但不同的系统参数对协作频谱感知系统的性能会产生不同的影响。在综合考虑系统资源利用率和归一化吞吐量的情况下,对不同条件下用户数和感知时长对系统性能的影响进行分析。并在检测概率约束条件下,对结合系统检测概率和归一化吞吐量的系统效用提出优化方法,可以求出满足条件的最大系统效用值。仿真结果表明,在不同的环境和条件限制下,达到最大系统效用所需要的用户数和感知时长也是不同的。
協作頻譜感知可以提升認知無線電的頻譜感知能力,但不同的繫統參數對協作頻譜感知繫統的性能會產生不同的影響。在綜閤攷慮繫統資源利用率和歸一化吞吐量的情況下,對不同條件下用戶數和感知時長對繫統性能的影響進行分析。併在檢測概率約束條件下,對結閤繫統檢測概率和歸一化吞吐量的繫統效用提齣優化方法,可以求齣滿足條件的最大繫統效用值。倣真結果錶明,在不同的環境和條件限製下,達到最大繫統效用所需要的用戶數和感知時長也是不同的。
협작빈보감지가이제승인지무선전적빈보감지능력,단불동적계통삼수대협작빈보감지계통적성능회산생불동적영향。재종합고필계통자원이용솔화귀일화탄토량적정황하,대불동조건하용호수화감지시장대계통성능적영향진행분석。병재검측개솔약속조건하,대결합계통검측개솔화귀일화탄토량적계통효용제출우화방법,가이구출만족조건적최대계통효용치。방진결과표명,재불동적배경화조건한제하,체도최대계통효용소수요적용호수화감지시장야시불동적。
Cooperative spectrum sensing can enhance the capabilities of spectrum sensing in cognitive radio, while different system parameters will produce different effects on the performance of cooperative spectrum sensing. After considering the system resource utilization and normalized throughput, the impact of the number of users and sensing duration under different conditions on system performance is analyzed. And under the condition of detection probability constraint, opti-mization of the system utility combined system detection probability and normalized throughput is proposed, which can be obtained to meet the conditions of the maximum system utility value. Simulation results show that in different environments and conditions, the number of users and the sensing duration needed to achieve the maximum system utility are different.