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Per-survivor processing for underwater acoustic communications with direct-sequence spread spectrum.
Xiaoka Xu1, Shengli Zhou, Andrey K Morozov
1Department of Electrical and Computer Engineering, University of Connecticut, 371 Fairfield Road Unit 2157, Storrs, Connecticut 06269, USA.
The Journal of the Acoustical Society of America
|May 10, 2013
Summary
This study introduces a novel receiver for underwater acoustic communications, combining per-survivor processing (PSP) with sparse channel estimation to enhance direct-sequence spread spectrum (DSSS) transmissions.
Area of Science:
- Electrical Engineering
- Signal Processing
- Underwater Acoustics
Background:
- Underwater acoustic channels present significant challenges for wireless communication due to multipath propagation and Doppler effects.
- Direct-sequence spread spectrum (DSSS) is a robust modulation technique, but its performance degrades in harsh underwater environments.
- Conventional receivers like RAKE struggle with complex channel conditions, necessitating advanced solutions.
Purpose of the Study:
- To propose a novel receiver architecture for DSSS transmissions in underwater acoustic channels.
- To improve receiver performance and reduce computational complexity compared to existing methods.
- To address the challenges posed by large Doppler disparities in underwater acoustic environments.
Main Methods:
- A per-survivor processing (PSP) structure is employed at the symbol level to manage computational complexity by limiting the number of states.
- Sparse channel estimation is performed at the chip level using the orthogonal matching pursuit (OMP) algorithm.
- A two-dimensional dictionary incorporating path delay and Doppler scaling factors is utilized for enhanced channel estimation.
Main Results:
- The proposed receiver demonstrates a significant performance improvement over the conventional RAKE receiver.
- The combination of PSP detection and sparse channel estimation achieves a favorable balance between performance and computational complexity.
- The receiver maintains excellent performance even in challenging underwater channels with substantial Doppler variations across different paths.
Conclusions:
- The proposed PSP receiver with sparse channel estimation offers a superior solution for DSSS in underwater acoustic communications.
- The method effectively mitigates the impact of multipath fading and Doppler spread.
- This approach provides a robust and efficient receiver for reliable underwater data transmission.
