存在相位抖动下Chirp-UWB信号零中频处理研究  

Research on Chirp-UWB Zero-IF signal processing under phase jitter

作　　者：杨元挺[1] 郑继禹[2] 

机构地区：[1]福建信息职业技术学院电子工程系,福州350003 [2]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2011年第2期106-110,共5页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(60962001);广西自然科学基金(0731026)

摘　　要：Chirp-UWB通信技术作为WPAN的无线接入标准而倍受关注,为降低采样率与技术成本,接收时常将GHz频段的Chirp-UWB信号搬移到基带进行匹配滤波或分数阶傅立叶变换(FRFT)处理。通过Chirp信号匹配滤波和FRFT能量聚集效能的简洁推导,分析了零中频变换存在的随机相位抖动对检测性能的影响。为消除频差,提出了一种Chirp信号归载频调制(CRCM)方式,用锁相环(PLL)可提取相干载波,对Chirp-UWB信号做无频差的零中频变换,取得良好的基带处理效果。仿真表明,提出的CRCM调制方式是有效的,提取环路的随机相位抖动对匹配滤波器基带处理有一定影响,而对FRFT的处理没有影响。As an optional physical-layer scheme in IEEE 802.15 standard,the chirp based ultra-wideband（Chirp-UWB） gains increasing concern.To decrease the sample rate and processing cost,Chirp-UWB is often shifted from GHz frequency to zero intermediate frequency（Zero-IF） for further detection.The detection performances under phase jitter caused by the shift are deduced for matched-filter receiver and fractional Fourier transform（FRFT） receiver respectively.To remove the carrier error in the shift,a carrier-returning-zero chirp modulation（CRCM） is proposed,and the coherent carrier can be extracted in received CRCM signal using phase-locked loop（PLL）.Near no carrier error is arrived in this shift.The analysis and the simulations show that there is a slight performance decline due to the phase jitter in matched-filter detector,but no influence for FRFT receiver.

关 键 词：线性调频 超宽带 分数傅立叶变换 锁相环 归载频调制 

分 类 号：TN929.5[电子电信—通信与信息系统]