基于子载波加权降低OFDM系统峰均功率比研究
毕业论文关键字：正交频分复用；峰均功率比；部分序列传输；子载波加权；Matlab
Title ： Study of Subcarrier-weighted PAPR Reduction in OFDM system Abstract： With more and more development of wireless communication, the requirements of transmission rate has become increasingly higher, and it’s very difficult for the traditional transmission method to do it. Orthogonal Frequency Division Multiplexing technology (OFDM) , with its superior anti-interference ability , has involved more and more researchers in this direction. OFDM technology pides the channel into many sub-channels, each channel is orthogonal to each other, and the spectrum overlap, thus improves the channel utilization. However, there is an inherent weakness in OFDM system that the signal has a big Peak-to-Average Power Ratio (PAPR), which will easily lead to the distortion of the OFDM signal and the decline of the system performance, hence, it’s necessary to find ways to lower the PAPR of the OFDM system. In this thesis, we carry out in-depth study of the basic theory and key technologies of OFDM system; analyze various methods of reducing PAPR of OFDM signal, mainly including pre-distortion technology, coding technology and probability class technology. On this basis, we propose an algorithm based on subcarrier weighted to reduce PAPR of OFDM signal. Through theoretical deduction and computer simulation, we analyze the impact of amplitude weighting coefficient on Bit Error Rate ( BER) and PAPR, and by selecting the weighting coefficients, we can get certain BER and PAPR. Under the guarantee of BER requirement, we can reduce the PAPR of OFDM signal, with a relatively small amount of calculation and a good practical value. In this thesis, we use the Matlab software for simulation of various algorithms in lowering PAPR and analyze the performance of various algorithms.
Keywords: OFDM; PAPR; Transmission of part of the sequence; Subcarrier weighted; Matlab
目 录
1 绪论 .. 1
1.1 研究背景 .. 1
1.2 发展现状 .. 2
1.3 研究与论文内容 .. 5
2 OFDM 的基本理论 .. 7
2.1 OFDM系统的基本原理 .. 8
2.1.1 OFDM 系统模型 8
2.1.2 OFDM 信号的实现 .. 9
2.1.3 保护间隔和循环前缀 10
2.2 OFDM 系统的同步 . 11
2.3 信道估计 . 12
2.4 OFDM 系统的峰均功率比 12
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