一种新的CMMB系统OFDM调制技术设计与实现方法*

研究了CMMB标准第一部分(STiMi子系统)中的OFDM调制技术,提出了一种新的基于FPGA的OFDM调制技术设计与实现方法,并改进了OFDM技术的核心算法IFFT的流水线结构,大大降低了FPGA乘法器的数量,节约了硬件资源。经FPGA实现与验证,该方法能够正确、高效地实现CMMB系统的OFDM调制技术。

New design and implementation method of OFDM in CMMB system

This article researched on OFDM modulation technique in the first part of CMMB standard which was called STiMi subsystem,and proposed a new method to design and implement OFDM modulation technique based on FPGA.Moreover,it improved the IFFT pipeline architecture,the core algorithm of OFDM technique.In this way,the number of the multiplier in FPGA could be reduced significantly,adding up to great hardware resources savings.Finally,it was verified by practice that the method can achieve accurate and high-efficient implementation of OFDM modulation technique of CMMB system.