A Weighted Turbo Equalized Multi-Band Underwater Wireless Acoustic Communications

The multi-band UWAS (Underwater Wireless Acoustic Sensor) communication techniques are effective in terms of performance and throughput efficiency because they can overcome selective frequency fading by allocating the same data to different frequency bands, in an environment of rapidly changing chan...

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Bibliographic Details
Published inApplied sciences Vol. 8; no. 10; p. 1711
Main Authors Lee, Hui-Su, Baek, Chang-Uk, Jung, Ji-Won, Kim, Wan-Jin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2018
Subjects
Acoustics
Autonomous underwater vehicles
Configuration management
Efficiency
Error analysis
Frequencies
multi-band
Propagation
Sensors
Signal processing
Spread spectrum
threshold
turbo pi code
Underwater acoustics
Underwater communication
underwater wireless acoustic communications
Wireless communications
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Summary:The multi-band UWAS (Underwater Wireless Acoustic Sensor) communication techniques are effective in terms of performance and throughput efficiency because they can overcome selective frequency fading by allocating the same data to different frequency bands, in an environment of rapidly changing channel transfer characteristic. However, the multi-band configuration may have a performance worse than the single-band one because performance degradation in one particular band affects the output from all the other bands. This problem can be solved by using a receiving end that analyzes the error rates of each band, sets threshold values and allocates the lower weights to the inferior bands. There are many methods of setting threshold values. In this paper, we proposed an algorithm to set the threshold value by using the preamble error rates, which are known data that have to be transmitted and received. In addition, we have analyzed the efficiency of multi-band transmission scheme in the UWAS communication by applying 1~4 number of multi-bands, using turbo pi codes, with a coding rate of 1/3. We evaluated the performance of the proposed multi-bands transmission model in real underwater environments. Experimental results showed that the performance increased as the number of multiple bands increased. Furthermore, the performance of multi-band was improved when the proposed threshold algorithm was applied.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8101711