中圖分類號： TN929.5 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.200057 中文引用格式： 竟詩琦，陳朝，蘇宇航. 基于全程耦合映像格子的OFDM系統(tǒng)性能改進算法[J].電子技術(shù)應(yīng)用，2020，46(7)：99-103. 英文引用格式： Jing Shiqi，Chen Zhao，Su Yuhang. Performance improvement algorithm of OFDM system based on GCML[J]. Application of Electronic Technique，2020，46(7)：99-103.
Performance improvement algorithm of OFDM system based on GCML
Jing Shiqi，Chen Zhao，Su Yuhang
School of Mechanical and Electronic Information，China University of Geosciences，Wuhan 430000，China
Abstract： Orthogonal Frequency Division Multiplexing(OFDM), as a technology that will still play an important role in 5G, will be restricted to its further development due to its high PAPR. SLM algorithm is an important means to reduce PAPR, but it still has some shortcomings such as out-of-band interference and high peak value can′t be completely filtered out. In view of the above problems, a SLM-RCF combined algorithm based on GCML is proposed in this paper, the algorithm makes full use of the good correlation，orthogonality and aperiodicity of GCML to improve SLM algorithm to improve its anti-interference ability, and combines with the RCF algorithm to further filter out high peak value. Theoretical analysis and simulation results show that the combined algorithm can reduce the influence of out-of-band interference and further reduce the PAPR, at the same time, it can reduce the system bit error rate, and improve the reliability of system.
Key words : orthogonal frequency division multiplexing；peak to average power ratio；selective mapping；globally couple map lattices
0 引言
正交頻分復(fù)用(Orthogonal Frequency Division Multiplexing，OFDM)是利用不同載波對數(shù)據(jù)調(diào)制的技術(shù)，具有抗射頻干擾、頻譜效率高等優(yōu)點[1]，在5G通信中依然發(fā)揮著舉足輕重的作用。但該技術(shù)存在高峰均比(Peak to Average Power Ratio，PAPR)[2]，這將導(dǎo)致OFDM信號產(chǎn)生非線性失真和系統(tǒng)性能降低的問題。因此，對降低峰均比算法的研究是本文的主要方向。
