Second Order Suboptimal Power Allocation for MIMO-OFDM Based Cognitive Radio Systems

This paper proposes an efficient and low complexity power-loading algorithm for MIMO-OFDM downlink based cognitive radio system that maximizes the sum rate of single secondary user (SU) under constraints on the tolerable interference thresholds between secondary user and primary user's frequenc...

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Bibliographic Details
Published in:KSII transactions on Internet and information systems 2014, 8(8), , pp.2647-2662
Main Authors: Nguyen, Tien Hoa, Nguyen, Thanh Hieu, Nguyen, Van Duc, Ha, Duyen Trung, Gelle, Guilllaume, Choo, Hyunseung
Format: Article
Language:English
Subjects:
Algorithms
Control
Electromagnetic interference
Engineering research
Mathematical optimization
MIMO communications
컴퓨터학
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Summary:This paper proposes an efficient and low complexity power-loading algorithm for MIMO-OFDM downlink based cognitive radio system that maximizes the sum rate of single secondary user (SU) under constraints on the tolerable interference thresholds between secondary user and primary user's frequency bands and the total transmission power. Our suboptimal algorithm is based on the 2nd order interference tracking and nulling mechanism to allocate transmission power of the subcarriers among SU's scheme. The performance of our proposed suboptimal scheme is compared with the performance of the classical power loading algorithms, e.g., water filling, 1st order interference tracking, nulling, and other suboptimal schemes. Numerical results show that our algorithm has low complexity but obtains a higher channel capacity than that of some previous suboptimal algorithms in some scenarios. We dedicate also that for a given interference threshold, the 2nd order interference tracking mechanism has dynamic number of nulling position instead fixed number of nulling position. Keywords: Cognitive Radio, MIMO, OFDM, Power Allocation Optimization
ISSN:1976-7277
1976-7277
DOI:10.3837/tiis.2014.08.004