在高选择性信道上的真实信号解调

H. Mariotte, P.Y. Cochet
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引用次数: 0

摘要

只提供摘要形式。水声信道可能是数据通信最复杂的环境之一。该信道的特性,包括衰落、多径和因此的频率选择性、多普勒频移,排除了标准通信技术的直接应用。但是,在许多情况下,拥有水下通信手段是可取的。将现有的估计方法应用到数字通信中是本文的新思路。实际上,在解调算法中对传播参数的自适应可以提高系统的性能。此外,对发射信号的先验知识允许计算自适应解调后的错误率。本文给出了在浅水(测试池和海洋)发射的真实信号并记录在DAT磁带上得到的主要结果。接收信号的相关图允许估计时间延迟和不同路径的衰减。相位估计和跟踪图允许提取每个路径的多普勒频移。通过对自适应解调前后误码率性能的比较,可以看出自适应解调对系统误码率性能的改善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Real signals demodulation on a highly selective channel
Summary form only given. The underwater acoustic channel is probably one of the most complicated environments for data communication. The characteristics of this channel, which include fading, multipath and therefore frequency selectivity, Doppler shift preclude direct application of standard communications techniques. But there are many situations in which it would be desirable to have the means to communicate underwater. The use of well known estimation methods for digital communication is the new approach of this paper. Indeed, the adaptation of the propagation parameters in the demodulation algorithm allows to improve the system performance. Moreover, the knowledge, a priori, of the emitted signals allows to calculate the error rate after the adaptive demodulation. This paper shows the main results obtained with real signals emitted in shallow water (testing pool and ocean) and recorded on a DAT tape. The correlation figure of the received signals permits the estimation of time delay and attenuation of the different paths. The figure of phase estimation and tracking allows the extraction of the Doppler shift for each path. The comparison between the error rate performance with and without adaptive demodulation shows the improvement brought by this demodulation.<>
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