摘 要 在第三代移动通信系统即将投入商用之际，全球的专家和学者对下一代移动通信系统的发展投入了前所未有的关注。正交频分复用（OFDM）技术被认为是非常适用于下一代移动通信系统中的无线信道高速传输技术，引起了广泛的研究兴趣。同其它的多载波系统一样，OFDM技术应用的主要障碍之一就是传输信号的高峰平比（PAR）问题，解决这个问题势在必行。 本论文是在广泛阅读中外有关OFDM峰值平均功率比控制技术文献的基础上，对现有的三类PAR控制方法：信号预畸变类方法、信号编码类方法、信号非畸变类方法，进行理论分析和比较，分析了各自方法的优缺点，归纳出PAR控制技术的发展趋势。对非畸变类方法进行了深入的研究，对其代表性算法：选择性映射（SLM）算法和部分传输序列（PTS）算法进行了理论分析、仿真比较，得出两种算法的优缺点。 本论文对部分传输序列（PTS）算法进行了深入的研究，针对传统PTS算法、迭代PTS算法、相位旋转PTS算法，以及改进的相位旋转PTS算法就算法算术复杂度和PAR分布两方面进行了深入的理论分析和MATLAB仿真比较；针对PTS算法的三种分组算法通过理论分析和MATLAB仿真验证得出各自的优缺点。从理论推导和MATLAB仿真验证两方面证明非畸变类算法可以优化OFDM系统的峰值干载比（PICR）分布，即非畸变类算法可以缓解载波频率偏移对OFDM系统的影响。

ABSTRACT Now, the experts and the scholars are more attentive to the improvment of the next generation mobile communication system as the 3rd generation mobile communication system will be applied in the business soon. Orthogonal frequency-division multiplexing (OFDM), known to be well suited for high rate transmission over radio channel of the next generation mobile communication system, has generated a large amount of research interests. One disadvantage is the potentially large peak-to-average power ratio (PAR) characteristic of a multicarrier signal with a large number of subchannels. So it is very important to solve this problem. In this paper, I analyse merits and defects about the three kinds of PAR control methods and also conclude the developmental tendency about PAR control technology that based on reading chinese or foreign countries’ literatures about how to control the PAR of OFDM broadly . I make researchs on the non-aberration method and its representative algorithms : selected mapping (SLM) and partial transmit sequence(PTS), and I get their merits and defects through the theoretical analysis and MATLAB simulative comparision. In this paper, I deeply make researchs on traditional PTS , iterative PTS, phasic rotation PTS, improved phasic rotation PTS algorithm through the theoretical analyse and MATLAB simulative comparision. I get merits and defects about three group algorithms in PTS. Moreover, I apply the non-aberration method to the area of synchronization for OFDM .Through theoretically analyse and MATLAB simulative validation,we can see the non-aberration method could reduce the disadvantage effect that carrier frequency offset bring to the OFDM system .