TY - GEN
T1 - Performance analysis of selective cooperation in underlay cognitive networks over Rayleigh channels
AU - Hussain, Syed Imtiaz
AU - Abdallah, Mohamed M.
AU - Alouini, Mohamed Slim
AU - Hasna, Mazen
AU - Qaraqe, Khalid
PY - 2011
Y1 - 2011
N2 - Underlay cognitive networks should follow strict interference thresholds to operate in parallel with primary networks. This constraint limits their transmission power and eventually the area of coverage. Therefore, it is very likely that the underlay networks will make use of relays to transmit signals to the distant secondary users. In this paper, we propose a secondary relay selection scheme which maximizes the end-to-end signal to noise ratio (SNR) for the secondary link while keeping the interference levels to the primary network below a certain threshold. We derive closed form expressions for the probability density function (PDF) of the SNR at the secondary destination, average bit error probability and outage probability. Analytical results are verified through simulations which also give insight about the benefits and tradeoffs of the selective cooperation in underlay cognitive networks. It is shown that, in contrast to non-cognitive selective cooperation, this scheme performs better in low SNR region for cognitive networks.
AB - Underlay cognitive networks should follow strict interference thresholds to operate in parallel with primary networks. This constraint limits their transmission power and eventually the area of coverage. Therefore, it is very likely that the underlay networks will make use of relays to transmit signals to the distant secondary users. In this paper, we propose a secondary relay selection scheme which maximizes the end-to-end signal to noise ratio (SNR) for the secondary link while keeping the interference levels to the primary network below a certain threshold. We derive closed form expressions for the probability density function (PDF) of the SNR at the secondary destination, average bit error probability and outage probability. Analytical results are verified through simulations which also give insight about the benefits and tradeoffs of the selective cooperation in underlay cognitive networks. It is shown that, in contrast to non-cognitive selective cooperation, this scheme performs better in low SNR region for cognitive networks.
KW - cognitive radio
KW - overlay networks
KW - relay selection etc.
KW - underlay networks
KW - user cooperation
UR - http://www.scopus.com/inward/record.url?scp=80052669886&partnerID=8YFLogxK
U2 - 10.1109/SPAWC.2011.5990375
DO - 10.1109/SPAWC.2011.5990375
M3 - Conference contribution
AN - SCOPUS:80052669886
SN - 9781424493326
T3 - IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
SP - 116
EP - 120
BT - 2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011
T2 - 2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011
Y2 - 26 June 2011 through 29 June 2011
ER -