一种自适应OFDM系统的设计及其在DSP上的实现  

The Design of an Adaptive-OFDM System and Its Implement on DSP

作　　者：陈晨[1] 孙黎[1] 张太镒[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《微电子学与计算机》2009年第5期1-4,8,共5页Microelectronics & Computer

基　　金：国家自然科学基金项目(60372055)

摘　　要：提出了一种基于自适应比特分配算法进行OFDM系统符号映射的方案,该方案充分利用OFDM子信道的正交性,能够有效对抗频率选择性衰落,频谱利用率高.设计出基于该方案的自适应OFDM系统,并在TITMS320C6416DSP上实现该系统的等效基带模型,完成了软件和硬件优化,满足实时性要求.通过测试表明,该系统相比目前的采用固定模式符号映射的OFDM系统抗频率选择性衰落性能更优.A symbol mapping scheme based on adaptive bit allocation algorithm in OFDM system is proposed in this paper.This scheme,which takes advantage of the orthogonality of sub channels in OFDM system,is effective against the frequency-selective fading,and can improve the spectral efficiency.Then an Adaptive-OFDM system is designed based on this scheme,and its baseband model is implemented on TI TMS320C6416 DSP as well as some optimization of software and hardware to fulfill the real-time requirement.The result shows that this system is better against the frequency-selective fading than the OFDM system using the fixed symbol mapping scheme.

关 键 词：自适应比特分配 OFDM 频率选择性衰落 信道建模 DSP优化 

分 类 号：TN929.5[电子电信—通信与信息系统]