OFDM系统梳状导频的PAPR问题及解决方案  

The PAPR problem in OFDM systems with comb-type pilots and its solution

作　　者：王新征[1] 杜岩[2] 张永生[3] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096 [2]山东大学信息科学与工程学院,山东济南250100 [3]上海交通大学图像通信与信息处理研究所,上海200240

出　　处：《电路与系统学报》2008年第5期125-128,135,共5页Journal of Circuits and Systems

基　　金：国家自然基金重大项目"未来移动通信系统基础理论及关键技术"资助课题(60496311)

摘　　要：分析了梳状导频对OFDM信号PAPR的影响。特别指出,取值不当的导频符号,例如等值导频,会加剧OFDM信号的PAPR。OFDM系统发送端通常采用降低PAPR的技术。带有等值梳状导频的OFDM信号会发生更大的失真,从而降低系统性能。经过分析,提出应用Newmann相位旋转方案优化等值导频。优化后的导频既不会降低信道估计的精度也不会恶化PAPR。优化方法能够与具体的信道估计方法相结合,并且不会增加信道估计的复杂度。This paper analyzes the influence of the comb-type pilots on the PAPR of OFDM systems. Improper comb-type pilots, e.g., equally-valued pilots, increase the PAPR of OFDM signals. PAPR reduction technique is often used in transmitter, it will cause larger signal distortion and introduce performance loss if OFDM system adopts equally-valued comb-type pilots. After analysis, we apply Newmann phasing scheme to optimize pilot symbols. The optimized pilots neither decrease the accuracy of channel estimation nor result in PAPR deterioration. The optimization scheme can be easily combined with channel estimation methods and does not increase the complexity of channel estimation.

关 键 词：正交频分复用(OFDM) 信道估计 梳状导频 峰值平均功率比(PAPR) 

分 类 号：TN92[电子电信—通信与信息系统]