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Second Order Suboptimal Power Allocation for MIMO-OFDM Based Cognitive Radio Systems
( Tien Hoa Nguyen ),( Thanh Hieu Nguyen ),( Van Duc Nguyen ),( Duyen Trung Ha ),( Guilllaume Gelle ),( Hyunseung Choo ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.8
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 2<sup>nd</sup> 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, 1<sup>st</sup> 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 2<sup>nd</sup> order interference tracking mechanism has dynamic number of nulling position instead fixed number of nulling position.