Design of OFDM Joint Synchronization Algorithm Based on Cyclic Prefix

2019 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

无线电电子学;计算机科学;材料科学

Liu, Mengyang^1 ; Wang, Hongjuan^1 ; Li, Yeli^1 ; Bian, Yuning^1

Beijing Institute of Graphic Communication, China^1

关键词: Carrier frequency synchronization;    Cyclic Prefix;    Maximum likelihood algorithm;    Orthogonal frequency division multiplexing systems;    Synchronization algorithm;    Synchronization error;    Timing synchronization;    Wireless communication system;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/563/5/052017/pdf
DOI  :  10.1088/1757-899X/563/5/052017

来源: IOP

【 摘 要 】

By studying the Maximum Likelihood (ML) algorithm and applying it to Orthogonal Frequency Division Multiplexing (OFDM) system, we analyze its performance. OFDM system has obvious advantages over other wireless communication systems, but it also has disadvantages, such as being sensitive to synchronization errors. The ML algorithm can solve this shortcoming of OFDM system. ML algorithm uses the redundant information carried by the cyclic prefix in OFDM code element. At the same time, ML algorithm calculates its maximum likelihood estimation algorithm to complete the code element timing synchronization and carrier frequency synchronization. Compared with other synchronization algorithms, ML algorithm can complete initial capture and synchronous tracking in one step, so it is widely used in OFDM systems. In this paper, we build a traditional OFDM system and apply the ML algorithm to OFDM synchronization simulation. By changing the design of relevant parameters, we describe the ML algorithm in detail and obtain the same results as the theory.