OFDM系统频偏校正研究与DSP实现  

Study on Frequency Offset Compensation in OFDM System and DSP Realization

作　　者：欧斌 高霞 李敬超 

机构地区：[1]重庆金美通信有限责任公司,重庆400030

出　　处：《微处理机》2016年第3期28-30,共3页Microprocessors

摘　　要：OFDM技术的基础是正交多载波,频偏会影响OFDM子载波的正交性,因此频偏估计和频偏校正是OFDM系统中的重要技术。根据TI公司TMS320C6670芯片的处理性能,进行了基于DSP C6670芯片的两种频偏校正方法的设计与实现,即查表法和浮点数累乘法。为了更方便阅读,后期修改和优化,用可读性高的线性汇编代码分别将两种方法进行编程实现。将两种方法的实现代码在CCSv5中运行,对比校正误差和指令消耗周期,得出浮点数累乘法误差小,指令周期消耗少,适用于设计实现的结论。OFDM Technology is based on orthogonally of carriers. Because frequency offset will effect orthogonally,the frequency offset estimation and the carrier frequency offset correction are important techniques in OFDM systems. In this paper,two methods of frequency offset correction,look- up table method and floating- point tired multiplication method,are designed and realized based on the TI TMS320C6670 DSP chip. For convenient read,modification and optimization,the linear assembly code is chosen to write the two programs. The running results of the two programs in CCSv5 software verify that the method of floating- point tired multiplication is better because of less error and instructions. So we use this method in our design and implementation.

关 键 词：OFDM系统 频偏校正 DSP实现 线性汇编代码 查表法 浮点数累乘法 

分 类 号：TN911.7[电子电信—通信与信息系统]