کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
753556 | 895547 | 2013 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Underwater communications in time-varying sparse channels using passive-phase conjugation Underwater communications in time-varying sparse channels using passive-phase conjugation](/preview/png/753556.png)
Passive-phase conjugation (PPC) achieves the pulse compression for the time delayed arrivals. This property has been used in underwater acoustic communications. In a time-varying channel, the temporal focusing degrades with time evolution. The block-based approach is implemented to avoid the impact of channel variations. The basic idea is that the channel is assumed constant within each block of a short time interval, and the channel is updated using detected symbols in the previous block. Using real data collected in a recent sea trial, this paper investigates: (1) the communications using PPC processing, where the block-based approach is used, (2) the matching pursuit (MP) algorithm exploiting the channel sparseness. It is found that the MP algorithm improves performance of the communications using PPC processing.
Journal: Applied Acoustics - Volume 74, Issue 3, March 2013, Pages 421–424