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학술지 Joint Design of Precoder and Receiver in Cognitive Radio Networks using an MSE Criterion
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저자
서방원
발행일
201111
출처
Signal Processing, v.91 no.11, pp.2623-2629
ISSN
0165-1684
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.sigpro.2011.05.019
협약과제
11VI1100, 스마트 모바일 서비스를 위한 B4G 이동통신 기술 개발, 박남훈
초록
We consider a single-user multiple-input multiple output (MIMO) transmission from secondary base station (SBS) in cognitive radio network where there is one primary user to which spectrum is licensed. It is assumed that coexistence of secondary network is allowed if interference power from the secondary network measured at primary user (PU) can be kept below a given threshold. In this paper, joint design problem of precoder and receiver is treated using mean-squared error (MSE) criterion between transmitted signal and its estimate at the receiver. Due to constraint on interference power measured at the PU, it is not possible to find an optimal solution in closed form. Therefore, a suboptimal solution with low complexity is proposed in closed form. Simulation results show that the MSE and bit error rate (BER) performances of the proposed scheme are 1.54.0 dB better than those of a conventional capacity-maximization scheme when the received signal-to-noise ratio (SNR) is high, and they converge to their lower bounds, i.e., those of an MSE-based scheme without considering the PU interference constraint, as the received SNR increases. © 2011 Elsevier B.V. All rights reserved.
키워드
Cognitive radio (CR) network, Mean-squared error (MSE), Multiple-input multiple-output (MIMO), Precoder design