摘要
正交频分复用(OFDM)系统应用中的一个关键问题是如何降低信号的峰值平均功率比(PAPR)。针对这一问题,本文提出一种新的峰均比抑制算法——最大值抵消算法。新算法利用OFDM系统的预留子载波,在子载波上注入冗余数据,形成新的信号,以改变原信号的PAPR值。在处理上,将新信号的PAPR值与原信号PAPR值进行比较,选取PAPR值较小的信号发送,从而降低信号的PAPR。仿真结果表明,由于新的算法不需要发送边带信息,不改变原信号的顺序和相位关系,故而在较好地抑制信号PAPR值的同时,该算法对误码率的影响非常小。这是本方法的主要特点和价值所在。
How to reduce high peak-to-average power ratio （PAPR） of the transmit signal is a major issue of OFDM system. This paper investigates a new PAPR reduction algorithm——the Max-value Cancellation Algorithm. New algorithm directly adds redundant data on reserved subcarriers to change PAPR of original signal. After comparing PAPR of the new signal after adding redundant data and PAPR of original signal, the signal with lower PAPR will be selected and transmitted. Simulation results show that the new algorithm does not require any side information, and does not Change the original signal sequence and phase relationship; therefore, it has good performance on reducing PAPR as well as the small impact on bit error rate. That is the key feature and merit of this method.
出处
《无线通信技术》
2007年第4期10-14,共5页
Wireless Communication Technology
基金
国家自然科学基金重大项目子课题资助(60496314)
