分集接收技术可有效抑制大气光强闪烁效应,是提升星地激光通信系统通信性能的有效手段之一.然而,在信道相关性对星地激光通信分集接收系统性能影响的研究中,缺乏信道相关系数的理论模型.基于non-Kolmogorov(非柯)湍流模型,建立了弱非柯...分集接收技术可有效抑制大气光强闪烁效应,是提升星地激光通信系统通信性能的有效手段之一.然而,在信道相关性对星地激光通信分集接收系统性能影响的研究中,缺乏信道相关系数的理论模型.基于non-Kolmogorov(非柯)湍流模型,建立了弱非柯湍流星地下行激光通信分集接收系统信道空间相关系数的理论模型.在此基础上,综合考虑大气湍流和信道空间相关系数的影响,给出了信道相关直接探测分集接收系统采用等增益合并(equal gain combining,EGC)时的误码率(bit error rate,BER)解析表达式,并分析了功率谱幂律、信道相关系数及天顶角等对系统平均BER的影响.研究表明:信道空间相关系数随功率谱幂律的增大而增大,系统平均BER随功率谱幂律的增大而变优.本研究可为分集接收系统的设计提供理论指导.展开更多
Weak signal reception is a very important and challenging problem for communication systems especially in the presence of non-Gaussian noise,and in which case the performance of optimal linear correlated receiver degr...Weak signal reception is a very important and challenging problem for communication systems especially in the presence of non-Gaussian noise,and in which case the performance of optimal linear correlated receiver degrades dramatically.Aiming at this,a novel uncorrelated reception scheme based on adaptive bistable stochastic resonance(ABSR)for a weak signal in additive Laplacian noise is investigated.By analyzing the key issue that the quantitative cooperative resonance matching relationship between the characteristics of the noisy signal and the nonlinear bistable system,an analytical expression of the bistable system parameters is derived.On this basis,by means of bistable system parameters self-adaptive adjustment,the counterintuitive stochastic resonance(SR)phenomenon can be easily generated at which the random noise is changed into a benefit to assist signal transmission.Finally,it is demonstrated that approximately 8dB bit error ratio(BER)performance improvement for the ABSR-based uncorrelated receiver when compared with the traditional uncorrelated receiver at low signal to noise ratio(SNR)conditions varying from-30dB to-5dB.展开更多
文摘分集接收技术可有效抑制大气光强闪烁效应,是提升星地激光通信系统通信性能的有效手段之一.然而,在信道相关性对星地激光通信分集接收系统性能影响的研究中,缺乏信道相关系数的理论模型.基于non-Kolmogorov(非柯)湍流模型,建立了弱非柯湍流星地下行激光通信分集接收系统信道空间相关系数的理论模型.在此基础上,综合考虑大气湍流和信道空间相关系数的影响,给出了信道相关直接探测分集接收系统采用等增益合并(equal gain combining,EGC)时的误码率(bit error rate,BER)解析表达式,并分析了功率谱幂律、信道相关系数及天顶角等对系统平均BER的影响.研究表明:信道空间相关系数随功率谱幂律的增大而增大,系统平均BER随功率谱幂律的增大而变优.本研究可为分集接收系统的设计提供理论指导.
基金supported in part by the National Natural Science Foundation of China(62001356)in part by the National Natural Science Foundation for Distinguished Young Scholar(61825104)+1 种基金in part by the National Key Research and Development Program of China(2022YFC3301300)in part by the Innovative Research Groups of the National Natural Science Foundation of China(62121001)。
文摘Weak signal reception is a very important and challenging problem for communication systems especially in the presence of non-Gaussian noise,and in which case the performance of optimal linear correlated receiver degrades dramatically.Aiming at this,a novel uncorrelated reception scheme based on adaptive bistable stochastic resonance(ABSR)for a weak signal in additive Laplacian noise is investigated.By analyzing the key issue that the quantitative cooperative resonance matching relationship between the characteristics of the noisy signal and the nonlinear bistable system,an analytical expression of the bistable system parameters is derived.On this basis,by means of bistable system parameters self-adaptive adjustment,the counterintuitive stochastic resonance(SR)phenomenon can be easily generated at which the random noise is changed into a benefit to assist signal transmission.Finally,it is demonstrated that approximately 8dB bit error ratio(BER)performance improvement for the ABSR-based uncorrelated receiver when compared with the traditional uncorrelated receiver at low signal to noise ratio(SNR)conditions varying from-30dB to-5dB.
