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Journal of the Acoustical Society of America / Volume 131 / Issue 2 / JASA EXPRESS LETTERS

Multiuser interference cancellation in time-varying channels

J. Acoust. Soc. Am. Volume 131, Issue 2, pp. EL163-EL169 (2012); (7 pages)

S. E. Cho1, H. C. Song2, and W. S. Hodgkiss2

1Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093-0407 scho@ucsd.edu
2Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0238 hcsong@mpl.ucsd.edu, wsh@mpl.ucsd.edu

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In this letter, an adaptive time-reversal multichannel combiner is embedded within an iterative successive interference cancellation receiver. With the addition of matching pursuit, a sparse channel estimation technique, the combined receiver is shown to provide both temporal interference cancellation as well as spatial interference suppression in decoding simultaneous transmissions from separate users in a time-varying underwater acoustic environment. Experimental data collected during the KAM11 experiment illustrates that for a two-user multiple-access system, multiuser separation can be achieved.

© 2012 Acoustical Society of America

Acknowledgment

This work was supported by the Office of Naval Research under Grant No. N00014-07-1-0739.

Article Outline

  1. Introduction
  2. Combined receiver: ATR and SIC
  3. Experimental results from a time-varying channel
    1. Single-user communications
    2. Multiuser communications
  4. Summary and conclusions

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KEYWORDS and PACS

Keywords

acoustic signal processing, acoustic wave interference, channel estimation, multi-access systems, multiuser channels, time-varying channels, underwater acoustic communication, underwater sound

PACS

  • 43.60.Dh

    Signal processing for communications: telephony and telemetry, sound pickup and reproduction, multimedia

  • 43.60.Gk

    Space-time signal processing, other than matched field processing

  • 43.60.Fg

    Acoustic array systems and processing, beam-forming

ARTICLE DATA

History
Received 24 Oct 2011
Accepted 28 Dec 2011
Published online 26 Jan 2012
Digital Object Identifier
http://dx.doi.org/10.1121/1.3678668

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

  1. M. Stojanovic, J. A. Capitovic, and J. G. Proakis, “Phase-coherent digital communications for underwater acoustic channels,” IEEE J. Ocean. Eng. 19, 110–111 (1994).
  2. P. Hursky, M. B. Porter, and M. Siderius,“Point-to-point underwater acoustic communications using spread-spectrum passive phase conjugation,” J. Acoust. Soc. Am. 120, 247–257 (2006)JASMAN000120000001000247000001. [MEDLINE]
  3. A. Song, M. Badiey, A. Newhall, J. Lynch, H. DeFerrari, and B. Katsnelson, “Passive time reversal acoustic communications through shallow-water internal waves,” IEEE J. Oceanic Eng. 35, 756–765 (2010).
  4. H. C. Song, “Time reversal communication in a time-varying sparse channel,” J. Acoust. Soc. Am. 130, EL161–EL166 (2011)JASMAN0001300000040EL161000001.
  5. M. Stojanovic and Z. Zvonar, “Multichannel processing of broadband multiuser communication signals in shallow water acoustic channels,” IEEE J. Ocean. Eng. 21, 156–166 (1996). [Inspec] [ISI]
  6. H. C. Song, J. S. Kim, W. S. Hodgkiss, W. Kuperman, and M. Stevenson, “High-rate multiuser communications in shallow water,” J. Acoust. Soc. Am. 128, 2920–2925 (2010)JASMAN000128000005002920000001.
  7. S. Cotter and B. Rao, “Sparse channel estimation via matching pursuit with application to equalization,” IEEE Trans. on Comm. 50, 374–377 (2002). [Inspec]
  8. J. Andrews, “Interference cancellation for cellular systems: A contemporary overview,” IEEE Wireless Commun. 2, 19–29 (2005).
  9. S. Cho, H. Song, and W. Hodgkiss, “Successive interference cancellation for underwater acoustic communications,” IEEE J. Oceanic Eng. 36, 490–501 (2011).
  10. J. Tropp and A. Gilbert, “Signal recovery from random measurements via orthogonal matching pursuit,” IEEE Trans. Inf. Theory 53, 4655–4666 (2007).

Figures (click on thumbnails to view enlargements)

FIG.1
(a) A receiver block diagram with ATR and MP embedded in the SIC frame work. (b) The ATR receiver for decoding user k. The filter weights are designed to minimize crosstalk from competing users without distorting the signal from user k.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(Color online) KAM11 experiment configuration and environmental conditions: (top) diagram of the KAM11 experiment in which two users transmit to a 16-element receiving array in 100-m deep water and an example sound speed profile collected during the experiment illustrating the downward refracting environment; (bottom) example channel impulse responses between user 1 (left) and user 2 (right) and a single element at 74-m depth of the receiving array taken from the output of MP during single-user processing.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(Color online) Decoding performance for user 1 (top row) and user 2 (bottom row) from data collected during KAM11: (a) soft symbol estimates from decoding the packets in a single-user setting, (b) final soft symbol estimates after four iterations of the combined receiver from decoding the multiuser packet, (c) mean-squared error comparison between the ATR only receiver (Ref. 6) (without channel updates) and the proposed receiver.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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