地面国标单载波系统频域均衡改进算法

在地面数字电视中国国家标准(DTMB)的单载波模式(C=1)下,时域均衡复杂度高,时延大。在研究单载波系统特殊的帧结构及高斯白噪声功率估计方法的前提下,提出一种改进的频域均衡算法,它是基于最小均方误差线性均衡(MMSE)准则设计的,并把下一帧的帧头等效为本帧的循环后缀与本帧帧体一起处理,构成类似于CP-OFDM的信号格式。理论分析和仿真结果表明,该算法运算量更小,均衡性能更好。

Improved Frequency Domain Equalization Algorithm for DTMB Single Carrier System

In the Single-carrier mode(C=1) of the terrestrial digital television Chinese standard(DTMB),time domain equalization has high complexity and long time delay.On the precondition of studying single carrier systems’ special frame structure and the method of estimating Gaussian white noise power,an improved frequency domain equalization algorithm is proposed,which is based on the minimum mean square error linear equalization(MMSE) criteria for design.In addition,it makes the next frame header as the current frame cyc-suffix and processes them together,which resembles the signal format of CP-OFDM.Theoretical analysis and simulation results show that the algorithm has smaller computation and better equalization performance.