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针对浅海水声信道的强多径效应和时变特性,提出了一种基于组合VFF-RLS+VSS-NLMS算法的自适应判决反馈均衡器,在训练模式下使用收敛速度较快的VFF-RLS算法以快速跟踪因为快衰落引起的信道特性的变化,在跟踪模式下使用计算复杂度较低的VSS-NLMS算法以克服慢衰落引起的信道特性变化。仿真结果表明,与组合RLS+LMS算法和组合RLS+NLMS算法相比,本文算法不仅具有良好的收敛特性和较低的误码率,而且能够在一定范围内较好地跟踪浅海水声信道的时变特性。
Aiming at the strong multipath effect and time-varying characteristic of shallow water acoustic channel, an adaptive decision feedback equalizer based on combined VFF-RLS + VSS-NLMS algorithm is proposed. In training mode, VFF-RLS Algorithm to quickly track changes in channel characteristics due to fast fading using a less computationally complex VSS-NLMS algorithm in tracking mode to overcome channel characteristics changes caused by slow fading. The simulation results show that compared with the combined RLS + LMS algorithm and the combined RLS + NLMS algorithm, the proposed algorithm not only has good convergence characteristics and low bit error rate, but also can track the shallow sea acoustic channel within a certain range Time-varying characteristics.