极低信噪比条件下M元扩频UWB通信体制研究  

Research on M-ary spread spectrum UWB communication mechanism in extremely low SNR environment

作　　者：熊海良[1] 马丕明[1] 杜正锋[1] 袁东风[1] 

机构地区：[1]山东大学信息科学与工程学院,济南250100

出　　处：《高技术通讯》2013年第5期456-461,共6页Chinese High Technology Letters

基　　金：中国博士后基金(2012M521333);山东省优秀中青年科学家科研奖励基金(BS2012DX022);山东省博士后创新项目(201203060);山东大学自主创新基金(2011GN063)资助项目

摘　　要：提出一种M元扩频超宽带(UWB)通信方案,从频谱特性、同步方案、误码性能等方面进行了分析与论述。从频谱上看,所提方案发送信号更接近于白噪声谱,隐蔽性好、抗侦察能力强,特别适合于隐蔽通信应用;在抗噪声性能方面,与直接序列超宽带(DS-UWB)相比,能显著改善误码特性,降低误码率曲线中的归一化信噪比,并具有逼近香农容量极限的趋势。同时,充分挖掘信号隐含周期性,提出了一种基于混合伪噪声(PN)码的M元扩频UWB信号快速同步方案,以便在进行极低信噪比UWB通信时,可彻底消除信令支路对系统性能的影响,进一步提高传输效率与隐蔽性。A novel M-ary spread spectrum ultra wideband （UWB） communication scheme in a low signal-to-noise ratio （SNR） environment is proposed, and its performance is analyzed from the perspective of coding selection, spectrum characteristic, and bit error rate. It is concluded that its spectrum has no discrete components, so the spectrum is smoother than direct sequence ultra wideband （DS-UWB） signals. Therefore, its signal can hardly be detected or intercepted by conventional signal detection methods, leading to the better anti-jamming, anti-interception performance and the better coexistence characteristic with incumbent systems. Moreover, the proposed scheme can greatly improve the bit error ratio （BER） performance, leading to the BER curve close to Shannon capacity. A fast synchronization strategy using hybrid pseudo noise （PN） codes is proposed, which makes full use of the potential character of M-ary UWB signals.

关 键 词：超宽带(UWB) M元扩频 信噪比(SNR) 隐蔽通信 

分 类 号：TN92[电子电信—通信与信息系统]