Research Article
QoS-Based Spectrum Access Control in MIMO Cognitive Radio Networks
@INPROCEEDINGS{10.1007/978-3-642-30493-4_52, author={Mei Rong and Shihua Zhu}, title={QoS-Based Spectrum Access Control in MIMO Cognitive Radio Networks}, proceedings={Wireless Internet. 6th International ICST Conference, WICON 2011, Xi’an, China, October 19-21, 2011, Revised Selected Papers}, proceedings_a={WICON}, year={2012}, month={10}, keywords={spectrum access control cognitive radio interference variable quality of service}, doi={10.1007/978-3-642-30493-4_52} }- Mei Rong
Shihua Zhu
Year: 2012
QoS-Based Spectrum Access Control in MIMO Cognitive Radio Networks
WICON
Springer
DOI: 10.1007/978-3-642-30493-4_52
Abstract
Cognitive radio (CR) is a promising technique to solve the conflict between the scarcity and underutilization of spectrum. Underlay spectrum sharing is one of the most attractive schemes to increase the sum rate of cognitive users (CUs) as well as reduce the interference at primary users (PUs). However, the adoption of an empirical value as interference constraint may result in outage of PUs or degrade the performance of CUs. By introducing interference variables and calculating interference constraints according to the quality of service (QoS) of PUs with different transmission requirements in every slot, a QoS-based spectrum access control (QSAC) scheme for multi-input multi-output (MIMO) cognitive radio networks is proposed. Besides, CUs with larger signal-to- interference-ratio (SIR) are selected and block diagonalization (BD) is applied to enhance the sum rate of CR system. Performance analysis and simulation results show that, compared with previous methods, the QSAC scheme leads to improved performance of both achievable sum rate of CUs and outage probability of PUs with the same order of complexity, and the gain of achievable sum rate of CUs is about 33% when the total power of CR system is 100w.
