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 |
|---|---|
| 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 |
|---|---|
| Country | United Kingdom |
| City | London |
| Period | 8.9.13 → 9.9.13 |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
Cite this
A soft decode-compress-forward relaying scheme for cooperative wireless networks. / Jayakody, Dushantha N K; Flanagan, Mark F.
2013 IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC Workshops 2013. Institute of Electrical and Electronics Engineers Inc., 2013. p. 205-209 6707865.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - A soft decode-compress-forward relaying scheme for cooperative wireless networks
AU - Jayakody, Dushantha N K
AU - Flanagan, Mark F.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84893591222&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84893591222&partnerID=8YFLogxK
U2 - 10.1109/PIMRCW.2013.6707865
DO - 10.1109/PIMRCW.2013.6707865
M3 - Conference contribution
SN - 9781479901227
SP - 205
EP - 209
BT - 2013 IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC Workshops 2013
PB - Institute of Electrical and Electronics Engineers Inc.
ER -