摘 要 现如今,在中国移动通信领域中,最为重要的技术之一,即为正交频分复用技术,简称 OFDM 技术。对于该技术而言,其具备相对较强的抗多径衰落能力,并且能够有效预防符号间存在的干扰现象,切实满足了无线信道内部高速传输的根本需求,故此,这项技术,受到诸多研发者的广泛青睐。实际上,由于 OFDM 技术中,涉及到正交多载波技术,故此,其具备相对较高的实际频谱利用率。在当其时期,已经广泛运用于无线局域网、数字音频广播及其相应的数字视频广播等多样化系统之中,OFDM 在4G LTE 技术中也已经得到了使用,是 LTE 三大关键技术之一,并且很有希望在 5G 中作为主要的调制方式。本篇论文,基于多载波调制理论,并且辅以数量性的应用研究,针对 OFDM 系统于 AWGN 信道亦或是多径瑞利衰落信道中,所表现出的多样化性能,进行了更深层次的细致研究。与此同时,基于 Simulink 仿真平台,成功构建出相对完善的 OFDM 数字基带传输模型。除此之外,针对 MDPSK、MPSK 及其 MQAM 等诸多调制映射方式,1是否会对 OFDM 系统中存在的实际误码率,产生一系列影响的实际问题,进行了相对细致的分析与阐述。关键词:正交频分复用;调制;误码率2ABSTRACTOrthogonal Frequency Division Multiplexing is one of key technologies in mobile communication fields. It is suitable for high rate data transmission wireless channel because it can combat inter-symbol interference and mufti-path fading efficiently. Now it has become an attractive technology. OFDM is a multiple carriers technology, supports high rate data transmission with high spectrum efficiency. Nowadays, OFDM technology has been used in many fields, such as wireless local network(WLAN), digital audio broadcasting(DAB),digital video broadcasting (DVB) systems and so on. OFDM has also been used in 4G LTE technology, and is one of the three key technologies of LTE. It is hopeful that it will be the main modulation mode in 5G.On the basis of Muti-carrier technology, we analysis the performance of OFDM in the AWGN channel and Muti-paths Rice fading channel. T...