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单载波时域均衡在长时延扩展水声信道中计算量大,并对接收机参数的选择较为敏感,可靠性低,而正交频分复用信号峰均功率比高、对频率偏移敏感.针对这些问题,提出基于扩频码的单载波块传输高速率水声通信方法和基于T/4分数间隔迭代频域均衡的接收机算法.该接收机利用已知扩频码进行信道估计以及对由多普勒偏移引起的旋转相位进行估计,并通过一种低复杂度迭代频域均衡算法改善系统性能.开展了湖上实验研究,结果表明在浅水1.8 km距离且复杂多径干扰条件下,利用BPSK/QPSK调制可实现10 2—10 4的误码率并达到1500—3000 bit/s的有效数据率.
Single-carrier time-domain equalization is computationally intensive in long-delay extended acoustic channels and is sensitive to the choice of receiver parameters and has low reliability. However, the peak-to-average power ratio of orthogonal frequency division multiplexing signals is high, In order to solve these problems, a single-carrier block transmission high-rate underwater acoustic communication based on spreading code and a receiver algorithm based on T / 4 fractional interval iterative frequency domain equalization are proposed. The receiver uses known spreading codes to estimate channel And estimate the rotation phase caused by Doppler shift, and improve the system performance through a low-complexity iterative frequency-domain equalization algorithm.Experimental research on the lake has been carried out and the results show that at a shallow water distance of 1.8 km and complex multipath interference conditions , BPSK / QPSK modulation can be achieved 10 2-10 4 bit error rate and achieve 1500-3000 bit / s effective data rate.