Collaborative distributed decoding
In a wireless network, multiple communications devices in close
proximity form a natural distributed antenna array. If a group of such
devices receive in some collaborative manner to exploit the inherent
spatial diversity, then the system performance can be significantly
improved. This research explores techniques for collaborate reception
using multiple devices. This collaborative communication approach is
different from traditional array processing because the distributed
nature of the communication nodes calls for network-oriented design
approaches and processing algorithms.
We investigate the method of collaborative distributed decoding to
obtain diversity advantage. In this approach, multiple nodes form a
distributed antenna array by collaboratively processing a received
signal. By exchanging information in a collaborative decoding process,
the nodes are able to extract diversity from the channel and decode
the message. The main obstacle to this approach is that there is a
vast amount of information that can be shared between the nodes. This
problem can be solved by using iterative decoding to extract important
information from the received signal at each node, and only this
information is passed to other nodes. Each node will then utilize the
information from other nodes to perform further decoding to obtain the
diversity advantage provided by the additional information. The
objective is to develop distributed processing techniques that allow
us to obtain the maximum degree of diversity advantage from the
signals received at multiple receiving nodes, while requiring a
minimum amount of information exchange between the nodes.
Sponsors: NSF and ONR
Publications
- X. Li, T. F. Wong, and J. M. Shea, "Performance Analysis for
Collaborative Decoding with Least-Reliable-Bit Exchange on AWGN
Channels," IEEE Transactions on Communications, Oct. 2004.
Submitted for publication.
- Avudainayagam, J. M. Shea, T. F. Wong, and Y. Fang, "Cooperative
diversity techniques in wireless communications," Ad Hoc and
Sensor Networks, Y. Xiao and Y. Pan, eds., Nova Science
Publishers, 2005.
- A. Avudainayagam, J. M. Shea, T. F. Wong, and X. Li,
"Collaborative decoding on block fading channels," IEEE
Transactions on Communications, Feb. 2003. Submitted for
publication. Revised Mar. 2004.
- T. F. Wong, X. Li, and J. M. Shea, "Distributed decoding of
rectangular parity-check code," Electronics Letters, vol. 38,
no. 22, pp. 1364-1365, Oct. 2002.
- A. Avudainayagam, J. M. Shea, and T. F. Wong, "Cooperative
diversity through reliability filling," in Proceedings of the 41st
Annual Allerton Conference on Communications, Control, and Computing,
Allerton House, Monticello, IL, Oct. 2003.
- J.-W. Moon, J. M. Shea, and T. F. Wong, "Collaborative decoding
using turbo codes," in Proceedings of the IEEE Military Communications
Conference (MILCOM '03), vol. 1, pp. 452-457, Boston, MA, Oct. 2003.
- X. Li, T. F. Wong, and J. M. Shea, "Bit-interleaved rectangular
parity-check coded modulation with iterative demodulation in a
two-node distributed array,"in Proceedings of the IEEE International
Conference on Communications (ICC '03), vol. 4, pp. 2812-2816,
Anchorage, AK, May 2003.
- A. Avudainayagam, J. M. Shea, T. F. Wong, and X. Li, "Reliability
exchange schemes for iterative packet combing in distributed array,"
in Proceedings of the IEEE Wireless Communications and Networking
Conference (WCNC '03), New Orleans, LA, vol. 2, pp. 832-837, Mar.
2003.
- T. F. Wong, X. Li, and J. M. Shea, "Iterative decoding for a
two-node distributed array," in Proceedings of the IEEE Military
Communications Conference (MILCOM '02), vol. 2, pp. 1320-1324,
Oct. 2002.
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