Non-memoryless Analog Network Coding in Two-Way Relay Channel
Refereed conference paper presented and published in conference proceedings

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AbstractPhysical-layer Network Coding (PNC) can significantly improve the throughput of two-way relay channels. An interesting variant of PNC is Analog Network Coding (ANC). Almost all ANC schemes proposed to date, however, operate in a symbol by symbol manner (memoryless) and cannot exploit the redundant information in channel-coded packets to enhance performance. This paper proposes a non-memoryless ANC scheme. In particular, we design a soft-input soft-output decoder for the relay node to process the superimposed packets from the two end nodes to yield an estimated MMSE packet for forwarding back to the end nodes. Our decoder takes into account the correlation among different symbols in the packets due to channel coding, and provides significantly improved MSE performance. Our analysis shows that the SNR improvement at the relay node is lower bounded by 1/R (R is the code rate) with the simplest LDPC code (repeat code). The SNR improvement is also verified by numerical simulation with LDPC code. Our results indicate that LDPC codes of different degrees are preferred in different SNR regions. Generally speaking, smaller degrees are preferred for lower SNRs.
All Author(s) ListZhang SL, Liew SC, Zhou QF, Lu L, Wang H
Name of ConferenceIEEE International Conference on Communications (ICC)
Start Date of Conference05/06/2011
End Date of Conference09/06/2011
Place of ConferenceKyoto
Country/Region of ConferenceJapan
Detailed descriptionorganized by IEEE COMSOC,
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesEngineering; Engineering, Electrical & Electronic; Telecommunications

Last updated on 2020-24-11 at 00:16