The Interference Nulling using Weighted Precoding in the MIMO Cognitive Radio System 


Vol. 35,  No. 8, pp. 768-776, Aug.  2010


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  Abstract

In this paper, we consider a linear precoding for the effective spectrum sharing in multiple-input multiple-output (MIMO) cognitive radio system where a secondary user coexists with primary users. The secondary user employs the orthogonal space time block coding (OSTBC) at the transmitter. Assuming a flat fading channel and a maximum-likelihood receiver, the optimum precoder forces transmission referred to as eigen-beamforming. In this paper, to eliminate the interference, ZF criterion based eigen-beamforming is not only used but also the precoding weight is chosen to cancel the remaining interference. This weight is computed by vector's likelihood. Simulation results show stronger interference suppression capability, better SER performance, and higher capacity than the algorithm in [4].

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  Cite this article

[IEEE Style]

S. Lee, S. Sohn, S. Jang, J. Kim, "The Interference Nulling using Weighted Precoding in the MIMO Cognitive Radio System," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 8, pp. 768-776, 2010. DOI: .

[ACM Style]

Seon-yeong Lee, Sung-hwan Sohn, Sung-Jeen Jang, and Jae-moung Kim. 2010. The Interference Nulling using Weighted Precoding in the MIMO Cognitive Radio System. The Journal of Korean Institute of Communications and Information Sciences, 35, 8, (2010), 768-776. DOI: .

[KICS Style]

Seon-yeong Lee, Sung-hwan Sohn, Sung-Jeen Jang, Jae-moung Kim, "The Interference Nulling using Weighted Precoding in the MIMO Cognitive Radio System," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 8, pp. 768-776, 8. 2010.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880