本文为印度Rourkela国立技术研究所（作者：RAHUL GOPAL）的硕士论文，共79页。

本文目的是分析5G通信中降低峰均比的性能。5G通信超越了4G和LTE技术，预计在2020年左右投入使用。5G技术标准化的研究正在进行。5G技术的关键目标之一是实现高数据速率（10Gbps）。为此需要很大的数据带宽。由于可用的频率资源有限，因此需要有效地利用频谱以获得高数据速率。同样为了利用空白频段，还需要认知无线电网络。认知无线电网络需要非常低的频带外辐射。OFDM技术在4G通信中得到了广泛应用，但缺点是频谱利用率低、带外辐射大。因此，5G通信需要采用新的波形。FBMC、UFMC、GFDM是5G通信的几种候选波形。FBMC是5G通信的一个潜在候选方案，在世界各地的许多5G项目中都得到了应用。本文将FBMC作为5G通信的候选波形。

高峰均比一直是多载波通信系统中的一个问题。FBMC也是一种多载波通信系统，因此也存在PAPR高的问题。为了降低峰均比，在过去的几十年中，人们提出了多种降低峰均比的技术。在多载波通信系统中，tone injection和companding是两种很有前途的降低峰均比的技术。

本文采用了tone injection和companding的组合方案，与单独的tone injection和companding相比，性能有了显著的提高。仿真分析了FBMC-FMT和FBMC-SMT系统的峰均比和误码率性能。本文还提出了一种新的基于限幅的PAPR降低方案。对该方案进行了仿真，分析了FBMC-FMT、FBMC-SMT和FBMC-CMT系统的峰均比性能。所有的仿真都在MATLAB中进行。

The goal of this thesis is to analyze PAPR reduction performance in 5G communication. 5G communication technology is beyond 4G and LTE technology and expected to be employed around 2020. Research is going on for standardization of 5G technology. One of the key objective of 5G technology is to achieve high data rate (10Gbps). For this a large bandwidth is needed. Since limited frequency resources are available, the frequency spectrum should be efficiently utilized to obtain high data rate. Also to utilize white space, cognitive radio networks are needed. In cognitive radio network very low out of band radiation is desired. OFDM is used in 4G communication but it has the drawback of low spectral efficiency and high out of band radiation, which makes it a poor choice for 5G communication. So for 5G communication new waveform is required. FBMC, UFMC, GFDM are some of the waveform candidates for 5G communication. FBMC is a potential candidate for 5G communication and it is used in many 5G projects around the world. In this thesis FBMC is used as a waveform candidate for 5G communication. High PAPR is always a problem in multicarrier communication system.

FBMC is also a multicarrier communication system, so it also suffers from high PAPR problem. To reduce the PAPR several PAPR reduction techniques have been proposed over the last few decades. Tone injection and companding are two promising techniques, which are used in PAPR reduction of multicarrier communication system.

In this thesis a combined scheme of tone injection and companding is used, which gives significant performance improvement compared to the tone injection and companding techniques taken separately. Simulation is performed to analyses the PAPR and BER performance of FBMC-FMT and FBMC-SMT system. Also a new clipping based PAPR reduction scheme is proposed in this thesis. For this scheme simulation is performed to analyze the PAPR performance of FBMC-FMT, FBMC-SMT and FBMC-CMT system. All the simulations are performed in MATLAB.

1.    5G技术简介

2. 基于滤波器组的多载波

3. 峰均功率比

4. PAPR降低的分析

5. 结论

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