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为了克服基于统计特性均衡准则的线性盲均衡器均方误差大、计算复杂及多途信道引起的载波相位旋转等问题,在研究基于极性迭代的线性盲均衡器与判决引导盲均衡器的基础上,引入数字锁相环技术,提出了一种基于联合极性迭代的载波相位恢复盲均衡算法。该算法利用极性算法来减小计算量,利用判决引导算法来减小均方误差,利用锁相环技术来克服多径衰落信道引起的载波相位旋转。水声信道盲均衡的仿真结果表明:该算法均方误差小,收敛速度快,计算复杂度低,并能快速纠正信道引入的载波相位旋转。
In order to overcome the problems of large mean square error of linear blind equalizer based on statistic property equalization criterion, complex phase and carrier phase rotation caused by multipath channel, the paper studies the basis of linear iterative linear equalizer and decision-directed blind equalizer On the introduction of digital phase-locked loop technology, this paper proposes a blind equalization algorithm for carrier phase recovery based on joint polarity iteration. The algorithm uses the polar algorithm to reduce the computational complexity, uses the decision-directed algorithm to reduce the mean square error, and uses phase-locked loop technology to overcome the carrier phase rotation caused by the multipath fading channel. The simulation results of underwater acoustic channel blind equalization show that this algorithm has small mean square error, fast convergence rate and low computational complexity, and can quickly correct the carrier phase rotation introduced by the channel.