基于MATLAB的OFDM系统设计与仿真  

Design and Simulation of OFDM Based on MATLAB

作　　者：何小雨[1] HE Xiao-yu(College of Electrical Engineering and Information,Siehuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气信息学院,四川成都610064

出　　处：《延安大学学报（自然科学版）》2018年第3期51-55,共5页Journal of Yan'an University：Natural Science Edition

摘　　要：OFDM技术因能大幅提升通信系统的信道容量和传输速率、有效抑制多径衰落和抵抗码间干扰,成为无线通信的核心技术。基于LTE系统物理层所使用的OFDM技术,分析子载波正交性原理和调制过程,基于Simulink构建了一个OFDM系统用于仿真。在搭建好系统后通过改变信道编码模块来模拟不同信道编码方式,通过对误码率的观察得到结论:众多信道编码方式中能使系统误码率最低的是LDPC编码,将其广泛应用于OFDM通信系统后可使系统性能更优异。OFDM technology can greatly improve the channel capacity and transmission rate of the communication system, it can also eft）ctively inhibit multipath fading and resist intercode interference. Now it is becoming the core technology of wireless communication. In this paper, we constructed an OFDM system based on the physical layer of LTE system. By using the principle of subcarrier orthogonality andanalyzing the modulation process, an OFDM system was constructed for simulation based on Simulink. And after set up system , by changing the channel coding module, simulate dirt）rent channel coding way was changed. Through the observation of the BER, we got the conclusion that among lots of channel coding method, LDPC codecan make the system bit en＇or rate lowest. If it is widely used in OFDM communication system, it can make a more excellent performance.

关 键 词：正交频分复用 系统仿真 信道编码 误码率 

分 类 号：TN919.1[电子电信—通信与信息系统]