• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

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

Vol. 8, No. 8, August 28, 2014
10.3837/tiis.2014.08.004, Download Paper (Free):

Abstract

This paper proposes an efcient 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 users 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 SUs 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.


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Cite this article

[IEEE Style]
T. H. Nguyen, T. H. Nguyen, V. D. Nguyen, D. T. Ha, G. Gelle and H. Choo, "Second Order Suboptimal Power Allocation for MIMO-OFDM Based Cognitive Radio Systems," KSII Transactions on Internet and Information Systems, vol. 8, no. 8, pp. 2647-2662, 2014. DOI: 10.3837/tiis.2014.08.004.

[ACM Style]
Tien Hoa Nguyen, Thanh Hieu Nguyen, Van Duc Nguyen, Duyen Trung Ha, Guilllaume Gelle, and Hyunseung Choo. 2014. Second Order Suboptimal Power Allocation for MIMO-OFDM Based Cognitive Radio Systems. KSII Transactions on Internet and Information Systems, 8, 8, (2014), 2647-2662. DOI: 10.3837/tiis.2014.08.004.