CAJ | 학술논문

针对水声信道高速数据传输中的码间干扰问题，设计了一种基于小波包变换的分数间隔盲均衡器，优化均衡器性能，以提高水下通信质量。采用具有过采样性质的分数间隔均衡器，减少了波特间隔均衡器常数模算法（CMA）的稳态误差，又加快了其收敛速度；并利用去相关性较强的小波包理论，进一步加快了分数间隔盲均衡器算法（FSE-CMA）和小波分数间隔均衡器算法（WT-FSE-CMA）的收敛速度。水声信道的仿真结果，验证了该均衡器的良好性能。
침대수성신도고속수거전수중적마간간우문제，설계료일충기우소파포변환적분수간격맹균형기，우화균형기성능，이제고수하통신질량。채용구유과채양성질적분수간격균형기，감소료파특간격균형기상수모산법（CMA）적은태오차，우가쾌료기수렴속도；병이용거상관성교강적소파포이론，진일보가쾌료분수간격맹균형기산법（FSE-CMA）화소파분수간격균형기산법（WT-FSE-CMA）적수렴속도。수성신도적방진결과，험증료해균형기적량호성능。
In order to overcome inter-symbol interference (ISI) of digital communication in underwater acoustic channels, a frac-tionally spaced blind equalizer based on orthogonal wavelet packet transform is proposed. This equalizer uses fractionally spaced equalizer with oversampling nature to obtain faster convergence rate and smaller mean square error than CMA of baud spaced equalizer, and makes full use of the better de-correlation ability of wavelet packet transform to have better convergence rate than fractionally spaced blind equalization algorithm (FSE-CMA) and fractionally spaced blind equalization algorithm based on orthog-onal wavelet transform (WT-FSE-CMA).The efficiency of the proposed equalizer is proved by computer simulation in under-water acoustic channels.