计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2014年
7期
99-103
,共5页
频谱感知%检测周期%主用户活跃性%凸优化
頻譜感知%檢測週期%主用戶活躍性%凸優化
빈보감지%검측주기%주용호활약성%철우화
spectrum sensing%sensing period%primary activity%convex optimize
针对以往的多带联合优化模型没有考虑检测周期对认知网络性能影响问题，提出了一种新的基于主用户活跃性的多带联合优化模型，将问题建模为干扰量、虚警和漏检概率等约束条件的非凸优问题，以最大化机会接入吞吐量为目标联合优化检测周期、感知时间和判决门限，并通过分层优化方法对其进行求解。数值分析表明，引入主用户活跃性影响后，在满足上述约束条件的同时，在保护主用户和机会接入吞吐量之间有了更好的权衡。
針對以往的多帶聯閤優化模型沒有攷慮檢測週期對認知網絡性能影響問題，提齣瞭一種新的基于主用戶活躍性的多帶聯閤優化模型，將問題建模為榦擾量、虛警和漏檢概率等約束條件的非凸優問題，以最大化機會接入吞吐量為目標聯閤優化檢測週期、感知時間和判決門限，併通過分層優化方法對其進行求解。數值分析錶明，引入主用戶活躍性影響後，在滿足上述約束條件的同時，在保護主用戶和機會接入吞吐量之間有瞭更好的權衡。
침대이왕적다대연합우화모형몰유고필검측주기대인지망락성능영향문제，제출료일충신적기우주용호활약성적다대연합우화모형，장문제건모위간우량、허경화루검개솔등약속조건적비철우문제，이최대화궤회접입탄토량위목표연합우화검측주기、감지시간화판결문한，병통과분층우화방법대기진행구해。수치분석표명，인입주용호활약성영향후，재만족상술약속조건적동시，재보호주용호화궤회접입탄토량지간유료경호적권형。
In order to solve the problem that primary multiband joint detection framework has not considered the perfor-mance impact of the detection cycle to cognitive networks, this paper presents a new framework related to the activity of primary users. The problem is modeled as a nonconvex optimization problem with the constraint of interference to the licensed users and miss, false alarm probability. Sensing period, sensing time and sensing threshold can be jointly opti-mized to maximum the throughput of cognitive system. This model is solved though bilevel optimization. The numerical analysis results show that better tradeoff has been got between throughput and protection of primary users after brings in the activity of primary users and guarantees the certain interference under limited.
