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A Full Journal Paper, authored by Dr. Xiaobo Zhou, Post-doctoral Researcher, Information Theory and Signal Processing Laboratory, School of Information Science, has been published in IEEE Transactions on Wireless Communications

[Title of the paper]
Correlated Sources Transmission in Orthogonal Multiple Access Relay Channel: Theoretical Analysis and Performance Evaluation
Xiaobo Zhou
[Acceptance Notification Date]
December 15th, 2013
In this paper, we consider the problem of transmitting two correlated binary sources over orthogonal multiple access relay channel (MARC), where two sources are communicating with a common destination with the assistance of a single relay. We assume decode-and-forward relaying strategy, and bit-wise exclusive or (XOR) network coding is performed at the relay node. First, a joint source-channel-network (JSCN) decoding technique is proposed to fully exploit the correlation between the sources, as well as the benefit of network coding. Then the achievable compression rate region of this system is derived based on the theorem for source coding with side information. It is found that the region is a 3-dimensional space surrounded by a polyhedron. Furthermore, the performance limit in Additive White Gaussian Noise (AWGN) channel and the outage probability in block Rayleigh fading channels are derived based on the achievable compression rate region. It is shown that the outage probability can be expressed by a set of triple integrals over the achievable compression rate region. The impact of source correlation on the performance of the system is investigated through asymptotic tendency analysis. The effectiveness of the proposed JSCN decoding technique and the accuracy of the theoretical analysis have been verified through a series of computer simulations, assuming practical channel codes. It is also shown that, as long as the source-relay links are perfect, the 2nd order diversity is always achieved with our proposed technique regardless of the source correlation.
[A Short Comment]
It should be noted here that this research was conducted under the financial/technical support of Graduate Research Program (GRP, when I was a doctor course student in JAIST). I am very much thankful to the support by the program. The future networks is expected to contain tremendous amount of relay nodes (users, base stations, access points, and/or sensors) cooperate each other so that the spectrum and energy efficiencies as well as robustness and flexibility of wireless networks can be enhanced significantly. The techniques shown in this paper definitely make significant contributions to this goal. We shall continue making our research efforts towards achieving new technologies for new generation wireless communications systems for ever-lasting sustainable, reliable, and secure society.
[About the Journal]
The rank of IEEE Transactions on Wireless Communications is at the top position in among 68 journals related to communications, according to Eigen Factor.

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The author's version of the paper is available at:
(From left)Assistant Prof. Anwar, Dr. Xiaobo and Prof. Tad Matsumoto

February 13, 2014