Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0238, USA.
J Acoust Soc Am. 2010 Sep;128(3):969-72. doi: 10.1121/1.3466860.
Phase-coherent communications typically requires a reliable phase-tracking algorithm. An initial phase estimate with training symbols allows a receiver to compensate for a motion-induced Doppler shift. Following the training period, however, explicit phase tracking can be avoided in time reversal communications that has been implemented on a block-by-block basis to accommodate time-varying channels. This is accomplished by a smaller block size and adaptive channel estimation using previously detected symbols on a symbol-by-symbol basis. The proposed time reversal approach without explicit phase tracking is demonstrated using experimental data (12-20 kHz) in shallow water.
相控通信通常需要一个可靠的相位跟踪算法。通过训练符号进行初始相位估计，接收器可以补偿运动引起的多普勒频移。然而，在基于块的时分反转通信中，在训练阶段之后，可以避免显式相位跟踪，以适应时变信道。这是通过使用较小的块大小和基于符号的自适应信道估计来实现的，该估计使用先前检测到的符号。所提出的无需显式相位跟踪的时分反转方法使用实验数据（12-20 kHz）在浅水中进行了验证。
