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针对多载波调制(MCM)传统频域均衡算法对水声信道变化跟踪能力差的缺点,提出了一种基于判决反馈结构的频域自适应均衡算法,并在此基础上对新算法的运算量进行了分析,针对新算法运算量大的问题,对其进行了简化.在信道不变和信道时变情况下分别对算法进行了仿真验证,结果表明,在具有较高信噪比的情况下,新的均衡算法较传统算法能更有效地跟踪信道变化,并且具有更好的误码率性能,同时简化的算法能在保证误码率性能损失不大的基础上,大大减少运算量,具有较高的应用价值.
Aiming at the shortcomings of traditional frequency-domain equalization algorithm of multi-carrier modulation (MCM) on tracking change of underwater acoustic channel, a frequency-domain adaptive equalization algorithm based on decision feedback structure is proposed. Based on this, The algorithm is simplified to deal with the large amount of computation of the new algorithm.The simulation results show that the proposed algorithm has high signal-to-noise ratio under the condition of constant channel and time-varying channel, , The new equalization algorithm can track the channel changes more effectively than traditional algorithms and has better BER performance. Meanwhile, the simplified algorithm can greatly reduce the computational load with little loss of bit error rate performance and has the advantages of Higher application value.