naa a22 4500 510793681 CHVBK 20180411083328.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11277-012-0767-3 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0767-3 On the Sum Rate Capacity of MIMO Broadcast Channels in Cognitive Radio Networks with Interference Power Constraints [Elektronische Daten] [Hai-Lin Xiao, Shan Ouyang, Cheng-Xiang Wang] This paper investigates the sum rate capacity of MIMO broadcast channels (MIMO-BCs) in cognitive radio networks. A suboptimal user-selection algorithm is proposed to achieve a large sum rate capacity with reduced complexity. This algorithm consists of two steps. First, zero-forcing beamforming is utilized as a downlink precoding technique that precancels inter-user interference. Second, singular value decomposition is applied to the channel matrices of all the secondary users and only consider the singular vectors corresponding to the maximum singular values. The proposed user-selection algorithm chooses singular vectors which are nearly orthogonal to each other and nearly orthogonal to the vector of primary users. With this algorithm, the sum rate capacity of MIMO-BCs in CR networks with interference power constraints and transmit power constraints is derived. We formulate the sum rate capacity as a multi-constraint optimization problem and develop an algorithm to solve the problem in its equivalent form. Finally, numerical simulations are conducted to corroborate our theoretical results in flat Rayleigh fading environments. It is shown that the proposed algorithms are capable of achieving a large sum rate capacity with a very low complexity. Springer Science+Business Media, LLC., 2012 MIMO broadcast channels nationallicence Cognitive radio network nationallicence Zero forcing beamforming nationallicence Interference power constraint nationallicence Dirty paper coding nationallicence Xiao Hai-Lin School of Information and Communication, Guilin University of Electronic Technology, 541004, Guilin, China aut Ouyang Shan School of Information and Communication, Guilin University of Electronic Technology, 541004, Guilin, China aut Wang Cheng-Xiang Joint Research Institute for Signal and Image Processing, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS, Edinburgh, UK aut Wireless Personal Communications Springer US; http://www.springer-ny.com 70/4(2013-06-01), 1589-1601 0929-6212 70:4<1589 2013 70 11277 https://doi.org/10.1007/s11277-012-0767-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0767-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Xiao Hai-Lin School of Information and Communication, Guilin University of Electronic Technology, 541004, Guilin, China aut NATIONALLICENCE 700 1- Ouyang Shan School of Information and Communication, Guilin University of Electronic Technology, 541004, Guilin, China aut NATIONALLICENCE 700 1- Wang Cheng-Xiang Joint Research Institute for Signal and Image Processing, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS, Edinburgh, UK aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 70/4(2013-06-01), 1589-1601 0929-6212 70:4<1589 2013 70 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer