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| Dynamic Spectrum Sharing Scheme Based on Spectrum Adaptation and MIMO-OFDM in Cognitive Radio |
| Hu Hao; Zhou Wen-an; Song Jun-de |
| School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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Abstract In this paper, a novel dynamic spectrum sharing scheme combining Spectrum Adaptation (SA) and MIMO-OFDM is proposed. In the scheme, an improved model due to signal power thresholds is adopted to accomplish spectrum adaptation for unlicensed users. In order to achieve the rate maximization, a dynamic power allocation algorithm is also presented. Simulation results indicate that the propositional scheme solves the partial interference problem of Interference Temperature Model (ITM) and the system performance is further improved via using MIMO technique. The proposed algorithm reduces the computational complexity and improves the spectrum efficiency.
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Received: 29 June 2007
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2008, Vol. 30 
