CAJ | 학술논문

水声信道复杂的时变特性会影响水声通信系统的性能，在设计时需要进行特殊考虑。利用逐幸存路径处理算法在无需插入训练序列的情况下即可同时进行信道估计和数据检测的特点，提出了一种信道估计动态更新的算法。该算法通过比较当前时刻各条幸存路径的分支量度来判断信道变化的情况，从而决定信道估计更新的时刻，达到动态更新信道估计的目的。仿真结果表明，所提出的基于信道估计动态更新的逐幸存路径处理算法能有效地跟踪信道变化的情况，在时变信道中使用能获得较好的性能。
수성신도복잡적시변특성회영향수성통신계통적성능，재설계시수요진행특수고필。이용축행존로경처리산법재무수삽입훈련서렬적정황하즉가동시진행신도고계화수거검측적특점，제출료일충신도고계동태경신적산법。해산법통과비교당전시각각조행존로경적분지량도래판단신도변화적정황，종이결정신도고계경신적시각，체도동태경신신도고계적목적。방진결과표명，소제출적기우신도고계동태경신적축행존로경처리산법능유효지근종신도변화적정황，재시변신도중사용능획득교호적성능。
Measures should be taken to overcome the time-variability of underwater acoustic channel, which will de-grade the performance of underwater communication systems. Per-survivor processing is an approximation of maxi-mum likelihood sequence estimation, and it provides a solution to carry out channel estimation and information detec-tion at the same time without using training data. An algorithm is proposed in this paper that the channel estimations are updated depending on the received data. By comparing the current costs in different survivor paths, the variation of channel is measured, hence whether to update the channel estimation or not is decided. Simulation result shows that the per-survivor processing algorithm based on data-depended updating of channel estimation is a good solution to underwater communication system in time-varying channels.