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为保证水声通信系统的可靠性,提出了一种具有位同步跟踪能力的盲均衡算法,根据通信升余弦成形函数的波形特点,借助早迟积分比相原理,利用分数间隔均衡器的输出值,在对水声信道多径效应、载波相位偏差补偿的同时,实现了对位同步最佳采样位置的跟踪估计,同时从节省带宽资源的角度出发,对采样误差函数进行了改进.仿真结果表明,所提出的算法能够有效地对信号最佳采样位置进行定位,并对复杂水声信道环境造成的采样位置偏移进行跟踪,在强烈多普勒频移效应影响下,能够保证均衡算法可靠运行,较单纯盲均衡算法具有更好的收敛性和稳定性.
In order to ensure the reliability of underwater acoustic communication system, a blind equalization algorithm with bit synchronization tracking capability is proposed. According to the waveform characteristics of raised cosine shaping function of communication, with the principle of early late integral phase ratio, the output of fractional interval equalizer , Which not only compensates for the multipath effect and carrier phase deviation of underwater acoustic channel, but also achieves the tracking estimation of the optimal sampling position for bit synchronization. At the same time, the sampling error function is improved from the perspective of saving the bandwidth. The simulation results show that , The proposed algorithm can effectively locate the best sampling position of the signal and track the sampling position offset caused by the complex underwater acoustic channel environment. Under the influence of the strong Doppler shift effect, the algorithm can ensure the reliable operation of the equalization algorithm , Which has better convergence and stability than the simple blind equalization algorithm.