TY - GEN
T1 - A low-complexity relaying protocols for incremental DF relay systems with co-channel interference
AU - Salhab, Anas M.
AU - Zummo, Salam A.
PY - 2013
Y1 - 2013
N2 - In this paper, we evaluate the interference effect on the performance of incremental decode-and-forward (DF) relay systems with a low-complexity relaying protocols and interference at the relays and destination. These protocols are based on the switch-and-examine diversity combining (SEC) and switch-and-examine diversity combining with post-examining selection (SECps) techniques. Based on the relaying criterion, the first checked relay whose second hop signal-to-noise ratio (SNR) satisfies a predetermined switching threshold is asked to forward the source message to destination only if the direct link is in outage. Closed-form expression is derived for the end-to-end (e2e) outage probability assuming Rayleigh fading channels. Also, the system performance is studied at high SNR regime for the two relaying protocols where the diversity order and coding gain are derived and analyzed. We assume that maximalratio combining (MRC) is used at the destination to combine the signal through the relay with that on the direct link. Monte-Carlo simulations are provided to validate the achieved analytical results. Findings illustrate that despite the presence of interference, the system still achieves performance gain and that the outage probability decreases when the number of relays increases, especially, in the range of SNR values that are comparable to switching threshold. Also, results show the effectiveness of the SEC and SECps relaying protocols in reducing the system complexity compared to the existing protocols as the opportunistic relaying.
AB - In this paper, we evaluate the interference effect on the performance of incremental decode-and-forward (DF) relay systems with a low-complexity relaying protocols and interference at the relays and destination. These protocols are based on the switch-and-examine diversity combining (SEC) and switch-and-examine diversity combining with post-examining selection (SECps) techniques. Based on the relaying criterion, the first checked relay whose second hop signal-to-noise ratio (SNR) satisfies a predetermined switching threshold is asked to forward the source message to destination only if the direct link is in outage. Closed-form expression is derived for the end-to-end (e2e) outage probability assuming Rayleigh fading channels. Also, the system performance is studied at high SNR regime for the two relaying protocols where the diversity order and coding gain are derived and analyzed. We assume that maximalratio combining (MRC) is used at the destination to combine the signal through the relay with that on the direct link. Monte-Carlo simulations are provided to validate the achieved analytical results. Findings illustrate that despite the presence of interference, the system still achieves performance gain and that the outage probability decreases when the number of relays increases, especially, in the range of SNR values that are comparable to switching threshold. Also, results show the effectiveness of the SEC and SECps relaying protocols in reducing the system complexity compared to the existing protocols as the opportunistic relaying.
KW - Incremental decode-and-forward relaying
KW - Interference
KW - Rayleigh fading
KW - Switching threshold
UR - http://www.scopus.com/inward/record.url?scp=84893335300&partnerID=8YFLogxK
U2 - 10.1109/PIMRC.2013.6666586
DO - 10.1109/PIMRC.2013.6666586
M3 - Conference contribution
AN - SCOPUS:84893335300
SN - 9781467362351
T3 - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
SP - 2601
EP - 2605
BT - 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013
ER -