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Soft-Information-Based Joint Network-Channel Coding for the Two-Way Relay Channel

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2 Author(s)
Winkelbauer, A. ; Inst. of Telecommun., Vienna Univ. of Technol., Vienna, Austria ; Matz, G.

We consider network coding for the time-division two-way relay channel (TWRC). Based on achievable rates, we study the optimal transmission time allocation for a three-phase transmission protocol. While existing network coding schemes for the TWRC perform "hard" network coding, we propose a novel soft-information-based joint network-channel coding scheme. A detailed description of the operation of each network node in our scheme is given. Moreover, we discuss optimal log-likelihood ratio quantization as well as the transmission of quantized soft information. Finally, we assess the performance of the proposed scheme using numerical simulations, including a comparison to conventional "hard" network coding and to direct transmission without relay.

Published in:

Network Coding (NetCod), 2011 International Symposium on

Date of Conference:

25-27 July 2011