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

Lee, Seon-yeong (인하대학교 정보통신대학원 무선전송연구실)
Sohn, Sung-Hwan (인하대학교 정보통신대학원 무선전송연구실)
Jang, Sung-Jeen (인하대학교 정보통신대학원 무선전송연구실)
Kim, Jae-Moung (인하대학교 정보통신대학원 무선전송연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.8A, 2010 , pp. 768-776 More about this Journal
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].
Keywords
Cognitive Radio; precoding; beamforming; correlation; interference nulling;
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