A minimum mean-squared error relay for the two-way relay channel with network coding

Authors:
Moonseo Park;Seong-Lyun Kim
Affiliations:
Communication Systems Laboratory, Division of Electronic and Computer Engineering, Ajou University, Suwon, Korea;Radio Resource Management & Optimization Laboratory, School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
Venue:
IEEE Communications Letters
Year:
2009

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A minimum mean-squared error relay for three-way relay channels with network coding

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Abstract

In this letter, we consider the two-way relay channel (TWRC) employing network coding. In TWRC, a conventional relay first decodes symbols from each user and combines (network coding) them using, for example, the XOR (eXclusive OR) operation. However, it may be suboptimal for the relay to use this concatenated approach, when the channels are noisy and the cost criterion is source distortion. Instead, we propose a new relay scheme that generates network coded symbols by performing symbol estimation and network coding operation jointly, in order to minimize the source distortion at the users.