一种新的有效抑制相位噪声的载波恢复环路  

A Novel Carrier Recovery Loop for Efficient Phase Noise Suppression

作　　者：李铮[1] 沈泊[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海200433

出　　处：《复旦学报（自然科学版）》2006年第1期77-81,86,共6页Journal of Fudan University：Natural Science

基　　金：上海市集成电路创新计划资助项目(047062008)

摘　　要：相位噪声对高阶QAM解调器的性能有很大影响,而载波恢复环路与相位噪声密切相关.通过理论分析和性能仿真,优化了载波恢复环路的位置及环路滤波器的参数,使之能有效地抑制相位噪声.将该载波恢复环路应用到DVB-C解调芯片中,芯片测试结果说明该解调芯片抑制相位噪声能力较强,性能上达到了准无误码(QEF)的标准.The phase noise impacts significantly the performance of high-order QAM （Quadrature Amplitude Modulation） demodulator,of which the carrier recovery loop proves to be the bottleneck. Based on theoretical analysis and performance simulation, the position of carrier recovery loop and the parameters of loop filter have been optimized to efficiently suppress the phase noise. A DVB-C（Digital Video Broadcasting-Cable） demodulator chip with this carrier recovery loop has been implemented,chip test shows that the phase noise has been efficiently suppressed and the system performance meets the OEF（Quasi Error Free） standard.

关 键 词：QAM解调器 相位噪声 载波恢复环路 

分 类 号：TN402[电子电信—微电子学与固体电子学]