Abstract
This paper introduces a new technique for soft information relaying (SIR) which is based on a soft decode-compress-forward (DCF) relay protocol. The proposed system provides a means of using distributed low-density parity-check (LDPC) coding in conjunction with higher order (M-ary PAM) modulation, which is effective even under poor source-relay link conditions. Ordinarily, such schemes suffer from error propagation to the destination caused by incorrect decoding at the relay when the signal-to-noise ratio (SNR) on the source-relay link is low; however, our system avoids this problem by generating soft versions of the additional (parity-bearing) PAM symbols for transmission from the relay. Furthermore, we propose a new model, which we refer to as the soft scalar model, for the soft symbols generated at the relay, and we appropriately modify the log-likelihood ratio (LLR) calculation at the destination. Simulation results demonstrate that the proposed scheme can maintain very good performance under poor source-relay SNR conditions.
Original language | English |
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Title of host publication | 2013 IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC Workshops 2013 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 205-209 |
Number of pages | 5 |
ISBN (Print) | 9781479901227 |
DOIs | |
Publication status | Published - 2013 |
Externally published | Yes |
Event | 2013 IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC Workshops 2013 - London, United Kingdom Duration: 8 Sep 2013 → 9 Sep 2013 |
Conference
Conference | 2013 IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC Workshops 2013 |
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Country | United Kingdom |
City | London |
Period | 8.9.13 → 9.9.13 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering