Bidirectional equalization for underwater acoustic communication
Abstract
The bidirectional decision feedback equalizer (BiDFE) that combines the outputs of a conventional decision feedback equalizer (DFE) and backward DFE can improve the performance of the conventional DFE by up to 1–2 dB based on simulations. In this letter, the BiDFE concept is extended to multichannel time reversal communications involving a DFE as a post-processor. Experimental data collected in shallow water (10–20 kHz) show that the performance can be enhanced by 0.4–1.8 dB in terms of output signal-to-noise ratio. In particular, a larger improvement (e.g., 1.8 dB) is achieved for time-varying channels where the channel diversity in opposite directions is more profound.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 21, 2012
- Source ID
- 10.1121/1.3695075
Entities
People
- H. C. Song
Organizations
- Office of Naval Research
- University of California, San Diego