数字电视地面广播COFDM传输中的软判决技术

Soft decision technique in digital video broadcasting COFDM transmission system

深入研究了数字电视地面广播COFDM解调方案中的解映射软判决技术,提出了适用于该系统的信道状态信息CSI提取方法。在此基础上通过算法仿真分析,进一步提出一种新的克服单频和PAL模拟电视同频干扰的消除法并给出计算公式。本设计基于国家数字高清晰度电视总体组的多载波BDB-T传输方案,方案样机采用FPGA实现其相应的硬件电路,经过在实际无线环境中传输测试,证明了所提方法的易实现性和其良好性能。

This paper investigates the soft decision of de-mapping technique in COFDM de-modulation scheme. It proposes a new method suitable for the scheme for extracting CSI from communication channel. On the basis of which, a new method for eliminating single frequency and PAL analog disturbance is proposed through simulation of the algorithms , and the computational equation is also presented. Our design is based on the BDB-T transmission scheme of TEEG. The correspondent FPGA hardware circuit through testing process in the actual wireless environment proves its easiness to be implemented and its excellent performance.