TY - JOUR
T1 - Interference mitigation for cognitive radio MIMO systems based on practical precoding
AU - Chen, Zengmao
AU - Wang, Cheng Xiang
AU - Hong, Xuemin
AU - Thompson, John
AU - Vorobyov, Sergiy A.
AU - Zhao, Feng
AU - Ge, Xiaohu
N1 - Funding Information:
The authors acknowledge the support from the RCUK for the UK–China Science Bridges Project: R&D on (B)4G Wireless Mobile Communications. Z. Chen, C.-X. Wang, and J. Thompson acknowledge the support from the Scottish Funding Council for the Joint Research Institute in Signal and Image Processing between the University of Edinburgh and Heriot-Watt University , as part of the Edinburgh Research Partnership in Engineering and Mathematics (ERPem) . Z. Chen and S. A. Vorobyov acknowledge the support from the National Science and Engineering Research Council (NSERC) of Canada . F. Zhao acknowledges the support from the National Natural Science Foundation of China (NSFC) (Grant No.: 61172055 ). C.-X. Wang and F. Zhao acknowledge the support of the Key Laboratory of Cognitive Radio and Information Processing (Guilin University of Electronic Technology), Ministry of Education, China (Grant No.: 2011KF01 ). X. Ge acknowledges the support from the NSFC (Grant No.: 60872007 ), National 863 High Technology Program of China (Grant No.: 2009AA01Z239 ), Hubei Provincial Science and Technology Department (Grant No.: 2011BFA004 ), and the Ministry of Science and Technology (MOST) of China , International Science and Technology Collaboration Program (Grant No.: 0903 ).
PY - 2013/12
Y1 - 2013/12
N2 - In this paper, we propose two subspace-projection-based precoding schemes, namely, full-projection (FP)- and partial-projection (PP)-based precoding, for a cognitive radio multiple-input multiple-output (CR-MIMO) network to mitigate its interference to a primary time-division-duplexing (TDD) system. The proposed precoding schemes are capable of estimating interference channels between CR and primary networks, and incorporating the interference from the primary to the CR system into CR precoding via a novel sensing approach. Then, the CR performance and resulting interference of the proposed precoding schemes are analyzed and evaluated. By fully projecting the CR transmission onto a null space of the interference channels, the FP-based precoding scheme can effectively avoid interfering the primary system with boosted CR throughput. While, the PP-based scheme is able to further improve the CR throughput by partially projecting its transmission onto the null space.
AB - In this paper, we propose two subspace-projection-based precoding schemes, namely, full-projection (FP)- and partial-projection (PP)-based precoding, for a cognitive radio multiple-input multiple-output (CR-MIMO) network to mitigate its interference to a primary time-division-duplexing (TDD) system. The proposed precoding schemes are capable of estimating interference channels between CR and primary networks, and incorporating the interference from the primary to the CR system into CR precoding via a novel sensing approach. Then, the CR performance and resulting interference of the proposed precoding schemes are analyzed and evaluated. By fully projecting the CR transmission onto a null space of the interference channels, the FP-based precoding scheme can effectively avoid interfering the primary system with boosted CR throughput. While, the PP-based scheme is able to further improve the CR throughput by partially projecting its transmission onto the null space.
KW - Cognitive radio
KW - Interference mitigation
KW - MIMO
KW - Precoding
UR - http://www.scopus.com/inward/record.url?scp=84887825370&partnerID=8YFLogxK
U2 - 10.1016/j.phycom.2012.04.007
DO - 10.1016/j.phycom.2012.04.007
M3 - Article
AN - SCOPUS:84887825370
SN - 1874-4907
VL - 9
SP - 308
EP - 315
JO - Physical Communication
JF - Physical Communication
ER -