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非线性码间干扰是影响卫星通信的重要因素之一,需要有效消除或降低这种影响。在用Volterra级数分解表示非线性信道基础上,提出了基于线性MMSE(Minimum Mean Square Error)的Turbo均衡算法,以解决非线性码间干扰问题。通过对基于线性MMSE的Turbo均衡算法作无先验信息和低复杂度的MMSE近似处理,在不降低均衡性能的前提下,既能同时消除线性和非线性干扰,又能大大降低计算复杂度。仿真验证了该算法的有效性。
Non-linear intersymbol interference is one of the important factors that affect satellite communications and needs to be effectively eliminated or mitigated. Based on Volterra series decomposing to represent nonlinear channel, a Turbo equalization algorithm based on linear MMSE (Minimum Mean Square Error) is proposed to solve the problem of nonlinear intersymbol interference. By using linear MMSE-based Turbo equalization algorithm without prior information and MMSE approximation with low complexity, the linear and nonlinear interference can be eliminated simultaneously while the computational complexity is greatly reduced without reducing the equalization performance. Simulation shows the effectiveness of the algorithm.