MMSE Based Block Diagonalization for Cognitive Radio MIMO Broadcast Channels
- Authors
- Lee, Kyoung-Jae; Lee, Inkyu
- Issue Date
- 10월-2011
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Cognitive radio; multi-user MIMO; minimum mean-squared error (MMSE); block diagonalization (BD)
- Citation
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.10, no.10, pp.3139 - 3144
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
- Volume
- 10
- Number
- 10
- Start Page
- 3139
- End Page
- 3144
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/111555
- DOI
- 10.1109/TWC.2011.081611.101853
- ISSN
- 1536-1276
- Abstract
- In this paper, we present a linear precoder design for cognitive radio (CR) multi-user multiple-input multiple-output (MU-MIMO) downlink systems where unlicensed secondary users (SUs) can simultaneously utilize the same spectrum used by a licensed primary user (PU). Although a zero-forcing block diagonalization (ZF-BD) precoder is extended to the CR network with the PU, a transmit power boost problem occurs. Therefore, we propose a regularized BD precoder method based on the minimum mean-squared error (MMSE) criteria subject to the interference power constraint under a predetermined threshold for the PU. As a result, the proposed CR-MMSE-BD scheme improves the signal-to-interference-plus-noise ratio at each SU's receiver, compared to the ZF-BD based method. The simulation results demonstrate that the proposed algorithm outperforms the ZF based technique for CR MU-MIMO downlink systems.
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