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A comparison of filter design structures for multi-channel acoustic communication systems
J. Acoust. Soc. Am. Volume 123, Issue 1, pp. 174-185 (2008); (12 pages)
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Add to FacebookThe application of inverse filter designs as a means of providing improved communication performance in acoustic environments is investigated. Tikhonov regularized inverse filters of channel transfer functions calculated in the frequency domain are used as a means of obtaining multi-channel filters. Three classifications of inverse filter structures have been considered using time-domain simulations. The performance of Tikhonov regularized inverse filters designed according to each of these classifications is compared with each other and against a filter design developed by Stojanovic [
Stojanovic, M. (2005). “Retrofocusing techniques for high rate acoustic communications,” J. Acoust. Soc. Am. 117, 1173–1185
]. It is shown that the filter design developed by Stojanovic requires less regularization and outperforms the Tikhonov regularized inverse filter designs when communicating over a single channel. While the filter developed by Stojanovic is designed to use multiple transmitters to transmit to a single receiver, the filter was implemented in a multi-channel system and proposed to have a focusing similar to that obtained using time-reversal. It was found that for the scenario used in the simulation, the Tikhonov regularized inverse design for full multi-channel inversion achieved better focusing than the design by Stojanovic, where simulation results show 20 dB less cross-talk at the expense of around 2 dB loss in signal strength.
© 2008 Acoustical Society of America
Article Outline
- INTRODUCTION
- FILTER DESIGNS
- Design classifications
- Tikhonov regularized inverse filter
- Regularization of Stojanovic’s two-sided filter for no ISI
- PERFORMANCE COMPARISONS
- RESULTS
- CONCLUSION
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History
Received 31 May 2007
Accepted 09 Oct 2007
Revised 09 Oct 2007
Accepted 09 Oct 2007
Revised 09 Oct 2007
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