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Limited Feedback Designs for Two-Way Relaying Systems with Physical Network Coding  

Kim, Young-Tae (School of Electrical Eng., Korea University)
Lee, Kwangwon (Agency for Defense Development (ADD))
Jeon, Youngil (Electronics and Telecommunications Research Institute (ETRI))
Lee, Inkyu (School of Electrical Eng., Korea University)
Publication Information
Journal of Communications and Networks / v.17, no.5, 2015 , pp. 463-472 More about this Journal
Abstract
This paper considers a limited feedback system for two-way wireless relaying channels with physical network coding (PNC). For full feedback systems, the optimal structure with the PNC has already been studied where a modulo operation is employed. In this case, phase and power of two end node channels are adjusted to maximize the minimum distance. Based on this result, we design new quantization methods for the phase and the power in the limited feedback system. By investigating the minimum distance of the received constellation, we present a code-book design to maximize the worst minimum distance. Especially, for quantization of the power for 16-QAM, a new power quantization scheme is proposed to maximize the performance. Also, utilizing the characteristics of the minimum distance observed in our codebook design, we present a power allocation method which does not require any feedback information. Simulation results confirm that our proposed scheme outperforms conventional systems with reduced complexity.
Keywords
Limited feedback; physical network coding; two way relaying;
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Times Cited By KSCI : 2  (Citation Analysis)
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