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p次方檢測器的協(xié)作頻譜感知網(wǎng)絡(luò)性能優(yōu)化
來源:電子技術(shù)應(yīng)用2013年第12期
張春平,, 唐菁敏, 曹金石,, 龍 華,, 王 飛
昆明理工大學(xué) 信息工程與自動(dòng)化學(xué)院,,云南 昆明650051
摘要: 在保障主用戶通信不受干擾的前提下,合理分配感知系統(tǒng)時(shí)隙,,最大限度地增大認(rèn)知網(wǎng)絡(luò)吞吐量,,提出優(yōu)化方案,在考慮無線瑞利信道和一定錯(cuò)誤率的報(bào)道信道條件下,對采用p次方檢測器的協(xié)作頻譜感知網(wǎng)絡(luò)聯(lián)合優(yōu)化,得出p次方檢測器的次方數(shù)和最佳感知時(shí)間?子,,以使認(rèn)知網(wǎng)絡(luò)吞吐量最大,。理論分析與仿真結(jié)果表明,協(xié)作頻譜感知網(wǎng)絡(luò)存在最佳次方數(shù)p和最佳感知時(shí)間?子,以滿足認(rèn)知網(wǎng)絡(luò)吞吐量最大化,,從而提高網(wǎng)絡(luò)頻譜利用率,。
中圖分類號: TN929
文獻(xiàn)標(biāo)識碼: A
文章編號: 0258-7998(2013)12-0103-04
Performance optimization of cooperation spectrum sensing networks using p-th detector
Zhang Chunping,,Tang Jingmin,,Cao Jingshi,Long Hua,,Wang Fei
Automation and Information Engineering, Kunming university of Science and Technology, Kunming 650051,China
Abstract: On the premise of protecting prime user′ communication without interference, to rationally allocate slots of sensing system and to maximally increase the throughput of the cognitive network, an optimization method is proposed. In considering of Rayleigh channel and report channel with a fixed error rate, cooperative spectrum sensing networks with p-th power detector is joint optimized to obtain of p-th power detector and optimal sensing time and to make the throughput of the cognitive network maximum. Theoretical analysis and simulation results show that there exists p-th power and optimal sensing time to make throughput of the cognitive network maximum and to improve the spectrum utilization.
Key words : cognitive networks; cooperative spectrum sensing; p-th power detector; throughput

     在認(rèn)知無線電網(wǎng)絡(luò)中,,協(xié)作頻譜感知能有效降低多徑衰落和陰影效應(yīng)的影響,提高檢測概率,。參考文獻(xiàn)[1]對比分析了傳統(tǒng)能量檢測器與改進(jìn)能量檢測器的檢測概率,,提出用伽瑪函數(shù)近似其統(tǒng)計(jì)量的方法。參考文獻(xiàn)[2]研究了改進(jìn)能量檢測的多天線協(xié)作頻譜感知,,分析了使總錯(cuò)誤率最小的次方數(shù),,但未考慮每根天線上的采樣信號數(shù)。參考文獻(xiàn)[3]采用“Majority”融合準(zhǔn)則研究了最優(yōu)融合準(zhǔn)則,,但未深入研究,。參考文獻(xiàn)[4]考慮多種數(shù)據(jù)融合準(zhǔn)則,對權(quán)衡吞吐量與感知時(shí)間做了深入研究,,未用改進(jìn)能量檢測器,。參考文獻(xiàn)[5]采用傳統(tǒng)能量檢測對協(xié)作頻譜感知系統(tǒng)的吞吐量進(jìn)行優(yōu)化,在滿足吞吐量最大的條件下,,得出最優(yōu)感知時(shí)間,。參考文獻(xiàn)[6-8]均對認(rèn)知網(wǎng)絡(luò)吞吐量進(jìn)行了優(yōu)化,,得出最佳協(xié)作頻譜感知時(shí)間,但都未采用改進(jìn)能量檢測器,。

    本文針對參考文獻(xiàn)[1-3]中未考慮單天線上的采樣信號數(shù),,在新模型中引入采樣信號數(shù)足夠大時(shí)采樣信號統(tǒng)計(jì)量服從中心極限定理,同時(shí)研究參考文獻(xiàn)[4-8]未研究p次方檢測器的單天線協(xié)作頻譜感知,,并且在考慮瑞利信道和報(bào)道信道的錯(cuò)誤率條件下,,聯(lián)合優(yōu)化得出次方檢測器的指數(shù)p和最佳感知門限?姿,以最大限度提高協(xié)作頻譜感知網(wǎng)絡(luò)吞吐量,。



 


大吞吐量相差不大,,而次方p取其他值時(shí),各曲線最大吞吐量各不相同,。由圖3可看出,最大吞吐量在0.6附近,,且此時(shí)最優(yōu)p在2~3之間,最佳感知時(shí)間在0.02附近,,與圖4中最大吞吐量點(diǎn)P=2.88,τ=0.018,R=0.583 6一致,。

    圖4為在OR準(zhǔn)則下,次方p,、感知時(shí)間?子與吞吐量的三維圖,。可以看出,,滿足吞吐量最大化的最佳感知時(shí)間?子與次方數(shù)p存在,。圖中,用小圓圈標(biāo)出的最大吞吐量點(diǎn)與圖2,、圖3中的結(jié)果一致,。由圖可知,在一定范圍內(nèi)吞吐量有一條極值曲線且變化明顯,。由此證明,,在初始條件給定后,存在次方p和感知時(shí)間?子使吞吐量最大。
    為了最大限度地提高認(rèn)知網(wǎng)絡(luò)吞吐量,,本文提出協(xié)作頻譜感測新模型,,在采用p次方檢測器和OR準(zhǔn)則下,聯(lián)合優(yōu)化次方p和感知時(shí)間?子來最大化網(wǎng)絡(luò)吞吐量,。理論與仿真證明存在最優(yōu)值使網(wǎng)絡(luò)吞吐量最大,。
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