中文摘要：

针对OFDM系统中高峰均比问题,已有的预留子载波（TR）算法是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。预留子载波算法结合限幅技术,将超出门限的值进行削波,并得到相应的索引值,然后按照削波幅值的大小得到对应的加权值叠加到原始信号上,以得到较低峰均比的发送信号。在这个过程中,创新性地提出改变TR的位置,以得到性能更佳的消峰信号。通过分析及仿真发现,改进方法以很小的误码率性能损失使信号的PAPR值降低了约2 dB。

英文摘要：

High PAPR（peak-to-average power ratio） of the transmit signal is a major issue of OFDM system. TR（Tone Reservation） method directly adds redundant data to reserved subcarriers, thus to change PAPR of original signal. The improved method based on the work of others is proposed, the proposed method is of fairly good time-domain peak cancellation performance, and this could reduce peak value of OFDM signals by multiply a scaling factor, and then shift the peak cancellation signal according to the clipping method. For this cancellation vector can be acquired, thus to reduce signal PAPR by adding the weight to the original OFDM signal. Both the comparison with the original method and the simulation indicate that the proposed method has a better performance and could reduce PAPR for about 2 dB.