相位偏差接收系统的研究及仿真分析  

Research and Simulation Analysis of the Phase Deviation Receiving System

作　　者：周武中[1] 田克纯[1] 覃远年[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《计算机工程与科学》2011年第1期181-185,共5页Computer Engineering & Science

基　　金：广西自然科学基金资助项目(桂科自0832245)

摘　　要：零中频接收系统以其高集成、低功耗和易于单片集成等优点,正成为射频接收机中极具竞争力的一种结构。针对零中频接收机存在IQ不平衡和直流漂移等固有问题,对两种接收机形式由于存在相位偏移产生镜像信号的系统性能进行分析,并对其抑制能力进行仿真比较。再基于Similink软件重点分析交叉混频结构存在相位误差对接收系统性能的影响优于常规的单正交零中频结构,并在相同相位误差的条件下比较两种接收机矢量变化和信噪比对相位的敏感度。通过实验证明:这种交叉混频的结构大大降低了对集成器件工艺偏差的敏感度,使其能更快地投入实际市场中。The zeroIF receiver system with the advantagments of？ high integration and low power consumption and ease of monolithic integration, is becoming a highly competitive structure in the radio frequency receiver. For the existences of the IQ imbalance and the DC drift inherent problems in zeroIF receiver, the system performance of image signals generated from existence of the phase shift in two types of receivers has been analyzed, and its suppression has been made simulation and comparison. Based on the similink software, the impact of the existing phase error in the crossmixing structure on the performance of the receiving system is superior to the conventional singlequadrature zeroIF structure ,which is mainly analyzed. Under the condition of the same phase error vector change and signal to noise ratio for the sensitivity of phase of the two receivers have been compared. The performance via experiment shows that the crossmixing structure has greatly reduced the sensitivity of the integrated device technology deviation, which enables it to more quickly be invested in the actual market.

关 键 词：零中频 相位误差 I/Q不平衡 器件工艺 

分 类 号：TP92[自动化与计算机技术]