So this thesis studies the algorithms which reduce the PAPR.

针对于此，本文主要研究降低峰值平均功率比算法。

A scheme named Phase Scrambling is proposed for the suppression of PAPR.

提出一种峰均功率比抑制的相位扰动方法。

Different phase sequences have different effects on reducing PAPR in SLM.

采用不同相位序列的选择性映射降低PAPR的效果是不同的。

The maximum PAPR and the used pulse shaping waveform is derived and proved.

分析论证了该方法的PAPR上限值和所用的脉冲成形波形集合。

On this basis, put forward a new scheme which reduces PAPR by constellation mapping.

在此基础上，提出一种新的基于星座映射来降低PAPR的方法。

The article mainly research how to reduce the signal peak to average power ratio (PAPR).

研究降低信号峰均功率比问题。

So the research on how to effectively reduce the PAPR of the OFDM system is quite meaningful.

因此，研究如何有效地降低OFDM系统的PAPR则具有非常重要的意义。

One of the major drawbacks of the OFDM system is the high peak-to-average power ration (PAPR).

正交频分复用(OFDM)系统的一个主要缺点是峰均功率比(PAPR)过高。

One of the key techniques is to reduce the peak-to-average power ratio (PAPR) of the OFDM-CPM system.

降低OFDM - CPM系统中的峰值平均功率比(PAPR)是关键技术之一。

The methods to lower the peak-to-average power ratio (PAPR) of OFDM system are researched in the essay.

本文着重研究了降低OFDM系统峰均功率比的方法。

A coding scheme based on Golay Complementary sequences and Reed-Muller codes is proposed to reduce the PAPR.

利用编码技术，根据格雷互补序列和雷德密勒码具有低的峰均功率比的特性给出了具体的编码过程。

Its main disadvantages are sensitivity to synchronization errors and high peak-to-average power ratio (PAPR).

它的主要缺点是对频率同步比较敏感，并且峰值平均功率比（PAPR）过高。

A short introduction to the principle of OFDM and definition of PAPR, its statistical description are presented.

首先简要介绍了OFDM的原理，PAPR的定义及其统计描述。

The selected mapping which lowers the PAPR of traditional OFDM system is employed for OFDM systems based on FRFT.

探讨了该系统中使用选择映射法降低峰均比。

Firstly, the advantages and disadvantages of three kinds of methods to lower the PAPR are researched and analyzed.

首先研究分析了目前降低峰均功率比的三大类方法的优缺点。

In order to solve this problem, many domestic and foreign scholars have done a lot of work on PAPR reduction technology.

为了解决这一问题，国内外学者对降低PAPR技术进行了大量的研究。

This thesis mainly focuses on design and implement of baseband module of CR experimental system and research on reduction of PAPR.

本文的主要工作是CR实验系统的基带模块的设计与实现以及降低峰均比技术的研究。

As a simplest approach, traditional clipping method can reduce PAPR of OFDM signals, but it causes large unwanted out-of-band radiation.

传统的削波算法虽然能够简单有效地降低信号的峰均功率比，但是会带来较大的额外频谱增益。

Always some PAPR reduction schemes are used on baseband, but if baseband signal combined to Intermediate Frequency (if), the peak may recur.

为了降低峰均比常用的是基带削峰的方法，而基带信号合成为中频信号后容易产生峰值再生的问题。

As it is to OFDM, WMCM has lower time complexity in baseband modulation, good PAPR distribution, and takes on more robust to pulse interference.

与OFDM相比较，WMCM的基带调制时间复杂度降低，峰均功率比更优，对抗脉冲干扰的能力更强。

The main contents are as follows:1. Reducing PAPR based on using Selected mapping (SLM): Selected mapping is an effective method of reducing PAPR.

利用选择性映射降低PAPR：选择性映射是降低PAPR的一种有效的方法。

They are compared with the performance of PAPR and BER. The results indicate that the performance of direct wideband mode is better than the other.

从两种方案的PAPR，不同收发模式下的系统性能进行了比较分析，得出直接宽带模式性能优于多载波模式。

The OFDM system has a major disadvantage that high peak to average power ratio (PAPR) can cause nonlinear distortion in the high power amplifier (HPA).

OFDM系统的一个主要缺陷就是峰平比过高引起的高功率放大器(HPA)的非线性失真。

Simulations also show similar PAPR reduction and fiber nonlinearity mitigation in optical inverse discrete Fourier transformer (OIDFT) based OFDM systems.

仿真结果表明，在基于全光离散傅立叶反变换器的OFDM系统中也同样有对峰均比和光纤非线性效应的抑制作用。

Thus pulse shaping technique can be used not only shape the spectrum of the transmitted signal to increase the bandwidth efficiency but also to reduce its PAPR.

因此脉冲成形技术不仅能对传输信号进行频谱成形来提高系统的频带利用率，而且还可以减小信号的PAPR值。

For the high Peak-to-Average Power Ratio (PAPR) problem existing in OFDM based MC-CDMA system uplink, this paper proposes a new system scheme as a solution to PAPR.

针对MC - CD MA系统的上行链路存在的峰均功率比问题，提出了一种降低峰均功率比的新的系统解决方案。

According to the problems methioned above, this dissertation focuses on PAPR reduction techniques for OFDM systems, so as to design the optimal transmission signal.

针对上述缺点，本文重点研究了OFDM系统中峰均比问题，从而对传输信号进行优化设计。

Theoretical analysis and simulation results show that the proposed method can effectively reduce the computational complexity without loss of PAPR reduction performance.

理论分析和仿真结果表明新算法能够有效降低传统算法的计算复杂度，且不会造成峰均比抑制性能的损失。