改进部分响应正交频分复用系统的设计与应用  

Design and application of improved partial response OFDM system

作　　者：曹祁生[1] 梁德群[1] 

机构地区：[1]大连海事大学信息工程学院,辽宁大连116026

出　　处：《大连海事大学学报》2007年第2期32-36,共5页Journal of Dalian Maritime University

基　　金：国家自然科学基金资助项目(60272017)

摘　　要：为提高现有部分响应正交频分复用系统抗噪声性能,提出改进的部分响应正交频分复用系统.建立相关编码与卷积的关系,相关编码可等效于快速傅里叶逆变换(IFFT)之后的一个脉冲成形滤波器.把滤波器一分为二,将其中一个搬移到接收机一侧,从而获得最佳或准最佳的接收.无线衰落信道仿真结果表明,改进的部分响应正交频分复用系统较传统正交频分复用系统和现有部分响应正交频分复用系统信噪比提高约1.9dB.An improved partial response OFDM （PR-OFDM） system was developed to enhance the noise immunity of existing PR-OFDM. The connection between correlative coding and convolution was established. The correlative coding was equivalent to a pulse shaping filter after inverse fast fourier transform （IFFT）. The pulse shaping filter was split into a cascade of two, and one of them was moved to the receiver side. With this design, the optimal or suboptimal receiving could be obtained. The wireless fading channel simulations show;that the proposed system is capable of improving SNR approximately by 1.9 dB compared with conventional OFDM and PR-OFDM systems.

关 键 词：正交频分复用 部分响应系统 脉冲成形 最佳接收 

分 类 号：TN911.3[电子电信—通信与信息系统]