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Joint Network-Channel Coding with Rateless code over Multiple Access Relay System

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2013年第1期12卷 320-332页

作者： Zhang, Yu Zhang, Zhaoyang Zhejiang Univ Dept Informat Sci & Elect Engn Hangzhou 310027 Zhejiang Peoples R China

In this paper, we consider an asymmetric time-division multiple access relay system consisting of two sources, one relay and one destination, where the channel conditions and message lengths of the two sources are allowed to be different. To enhance the link robustness and the system throughput, joint network-channel coding (JNCC) is employed with a specially designed rateless code which conducts both the channel coding and network coding simultaneously. In particular, at the sources, messages are rateless coded and then broadcasted to the relay and destination. While at the relay, a novel two-dimensional (2 - d) lt code is proposed, which jointly encodes the precoded message bits of the two sources using a 2 - d degree profile and at the meantime completes the network coding inherently. Interestingly, the proposed scheme can be degraded to several conventional JNCC schemes based on rateless coding. To further approach the theoretical limit, the corresponding degree profiles implemented at both sources and the relay are jointly designed based on the extrinsic information transfer (EXIT) function analysis. Simulations show that our proposed JNCC scheme with the optimized degree profiles outperforms other JNCC schemes with the conventional profiles both on the BER and throughput performances.

关键词： Joint network-channel coding multiple access relay system rateless code 2-d lt code

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