TY - GEN
T1 - Optimal achievable rate trade-off in cooperative cognitive radio systems
AU - Zeng, Ruochen
AU - Tepedelenlioglu, Cihan
N1 - Funding Information:
This work was supported in part by the National Science Foundation under Grant ECSS 1307982.
PY - 2017/6/16
Y1 - 2017/6/16
N2 - A relay-aided cooperative underlay cognitive radio system with random number of secondary users (SU), and an interference constraint at the primary receiver (PR) is considered. When the primary (PU) is active, those SUs whose interference at the PR is above a threshold will amplify-and-forward PU's signal to enhance the PU's performance, and those SUs below this threshold will proceed with their own transmission in an underlay fashion. As the mean number of relay SUs increases, the PU's performance is improved but causes degradation of SU system performance. We study the optimal trade-off between the achievable rate of the SU and PU systems in the large mean number of SUs regime. This is then followed by a derivation of the optimal ratio between the mean number of relays and underlay SUs. Monte-Carlo simulations are used to verify our analytical results.
AB - A relay-aided cooperative underlay cognitive radio system with random number of secondary users (SU), and an interference constraint at the primary receiver (PR) is considered. When the primary (PU) is active, those SUs whose interference at the PR is above a threshold will amplify-and-forward PU's signal to enhance the PU's performance, and those SUs below this threshold will proceed with their own transmission in an underlay fashion. As the mean number of relay SUs increases, the PU's performance is improved but causes degradation of SU system performance. We study the optimal trade-off between the achievable rate of the SU and PU systems in the large mean number of SUs regime. This is then followed by a derivation of the optimal ratio between the mean number of relays and underlay SUs. Monte-Carlo simulations are used to verify our analytical results.
KW - Cognitive radio
KW - opportunistic relay selection
KW - random number of users
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U2 - 10.1109/ICASSP.2017.7952823
DO - 10.1109/ICASSP.2017.7952823
M3 - Conference contribution
AN - SCOPUS:85019665271
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 3579
EP - 3583
BT - 2017 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2017 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2017 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2017
Y2 - 5 March 2017 through 9 March 2017
ER -