Abstract: In order to improve the equalization convergence performance for single-carrier broadband signals, an equalization technology based on subband is discussed. Two broadband nonlinear equalization structures with switch modes are proposed by using complex-valued subband filterbanks and decision feedback equalizer. The update iterative formulae of these two structures are deduced based on least mean square algorithm. Their convergence characteristics are analyzed in different equalization modes. Simulation experiments show that these two structures can be used in group delay channel. Compared to conventional equalization they have better convergence performance and lower calculation complexity.

Key words: subband, analysis filter banks, synthesis filter banks, equalization

摘要： 针对单载波宽带信号均衡难以收敛的问题，研究了一种基于子带分解与重构的宽带非线性均衡技术。综合利用复数子带滤波器组与判决反馈均衡器理论，给出了两种具有模式切换功能的宽带非线性均衡结构，基于最小均方算法推导了它们的均衡权值迭代更新公式，分析比较了两种结构在不同均衡模式下的收敛特点。仿真证明基于子带技术的宽带非线性均衡能适用于群时延较严重的信道，且比传统全频带均衡具有更好的收敛效果和更低的计算复杂度。

关键词: 子带, 分析滤波器组, 综合滤波器组, 均衡