Cognitive Radio MIMO Gaussian Broadcast Channels with the Power Constraint |
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Authors: | Hai-Lin Xiao Shan Ouyang Cheng-Xiang Wang |
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Affiliation: | 1. School of Information and Communication, Guilin University of Electronic Technology, Guilin, 541004, China 2. Joint Research Institute for Signal and Image Processing, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
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Abstract: | The cognitive radio multiple-input multiple-output Gaussian broadcast channels are studied where multiple antennas are available for both primary users and secondary users in a spectrum sharing environment, and the sum-rate capacity is also obtained under both the SUs’ transmit power constraint and interference power constraint at the primary receivers. The paper principally consists of two steps. First, a duality technique and dirty paper coding are adopted to simplify the channels. Second, we propose an iterative power allocation algorithm to obtain the maximum sum-rate capacity and examine the effects of the constraint parameters on the concerned quantities. Finally, numerical simulation results are presented to validate the proposed theoretical analysis. |
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