寻找OFDM系统理想的峰均功率比  

Finding Out the Ideal PAPR in OFDM System

作　　者：张振川[1] 刘江宁[1] 宋俊保[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2008年第8期1108-1110,共3页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2002AA784030)

摘　　要：从理论上分析了经过降低峰均功率比(PAPR)方法处理后的OFDM信号误比特率和PAPR之间的关系,发现在保证功率放大器功放效率的前提下,存在一个可使误比特率达到最低值的PAPR.这种PAPR被定义为最理想的PAPR,但不一定是最小的PAPR.利用现有的两种降低PAPR的方法——剪波法和选择映射法,对所提出的理论加以论证.最后以剪波法为例,利用计算机仿真软件MATLAB对采用剪波法降低PAPR的OFDM系统进行仿真,结果证实了所提出理论的正确性,即可找到理想的PAPR,此时系统的误码率更小,系统的性能更好.Discusses theoretically the relation between BER and PAPR in an OFDM system which has been processed to decrease PAPR. On conditions that the power amplifier efficiency is ensured, there is a PAPR that enables the BER to be minimum. Such a PAPR is defined as an ideal one but uncertainly a minimum one. What is mentioned above is demonstrated by two existing methods to reduce PAPR, i.e., wave clipping and selective mapping. Taking the former as example that is used to reduce PAPR in an OFDM system, the software MATLAB is applied to simulating the system and the results verify the correctness of the demonstration： the ideal PAPR is available to find out with less BER to improve the system performance.

关 键 词：正交频分复用 峰均功率比 误比特率 信噪比 功放效率 

分 类 号：TP291.9[自动化与计算机技术—检测技术与自动化装置]