基于16QAM信号星座点判决域切换的混合正方形轮廓线算法

The hybrid square contour algorithm switches based on the judgement domain of the constellation points for 16QAM signals

提出了一种基于16QAM信号星座点判决域切换的混合正方形轮廓线算法.该算法通过判决输出信号是否在星座点判决域内,在正方形轮廓线算法和判决导引算法之间进行切换,不仅能够对输出信号进行相位恢复,而且可以得到更小的剩余码间干扰.水声信道仿真结果表明:与传统的正方形轮廓线算法相比,混合正方形轮廓线算法的码间干扰更低,输出星座点更紧凑,对水声信道具有良好的均衡能力.

A hybrid square contour algorithm for 16QAM signals is proposed. By judging whether the output signals are in the judgement domain of the constellation points and switching the algorithm between the square contour algo- rithm （SCA） and decision-directed （DD）, this algorithm can recover the phase and reduce the Intersymbol Inter- ference （ISI）. Simulation results with underwater acoustic channel verify the significant improvements of the pro- posed algorithm in the convergence rate and ISI as compared with the conventional SCA. The ISI of the proposed al- gorithm is low, thus can provide underwater acoustic channel with significant equalization ability.