Modified Block Diagonalization Precoding in Multicell Cooperative Networks
In downlink multiuser multiple-input-multiple-output (MIMO) systems, block diagonalization (BD) is a practical linear precoding scheme that completely eliminates interuser interference. However, its sum rate performance is rather poor in practical signal-to-noise ratio (SNR) regions due to the trans...
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| Published in: | IEEE transactions on vehicular technology Vol. 61; no. 8; pp. 3819 - 3824 |
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| Format: | Journal Article |
| Language: | English |
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New York, NY
IEEE
01.10.2012
Institute of Electrical and Electronics Engineers |
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| ISSN: | 0018-9545, 1939-9359 |
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| Abstract | In downlink multiuser multiple-input-multiple-output (MIMO) systems, block diagonalization (BD) is a practical linear precoding scheme that completely eliminates interuser interference. However, its sum rate performance is rather poor in practical signal-to-noise ratio (SNR) regions due to the transmit power boost problem. In this paper, we propose a modified BD precoding scheme to improve its low-to-medium SNR performance with the so-called "effective SNR enhancement" technique. The proposed transmit covariance matrices are obtained by first solving a power minimization problem subject to the minimum rate constraint achieved by BD and then properly scaling the solution until the power constraint is active. The power minimization problem is nonconvex in general. We therefore propose an efficient algorithm that approximately solves the problem. Simulation results demonstrate significant sum rate gains over BD and existing minimum mean square error (MMSE)-based precoding schemes. |
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| AbstractList | In downlink multiuser multiple-input-multiple-output (MIMO) systems, block diagonalization (BD) is a practical linear precoding scheme that completely eliminates interuser interference. However, its sum rate performance is rather poor in practical signal-to-noise ratio (SNR) regions due to the transmit power boost problem. In this paper, we propose a modified BD precoding scheme to improve its low-to-medium SNR performance with the so-called "effective SNR enhancement" technique. The proposed transmit covariance matrices are obtained by first solving a power minimization problem subject to the minimum rate constraint achieved by BD and then properly scaling the solution until the power constraint is active. The power minimization problem is nonconvex in general. We therefore propose an efficient algorithm that approximately solves the problem. Simulation results demonstrate significant sum rate gains over BD and existing minimum mean square error (MMSE)-based precoding schemes. |
| Author | Gunawan, E. Yong Liang Guan Yong Zeng |
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| Keywords | Performance evaluation Diagonalization Block diagonalization Noise reduction Wireless telecommunication Optimization method Downlink Cell network precoding Convex programming Mean square error Covariance Coding Pretreatment Mobile radiocommunication MIMO system Multiple access Cooperative systems Interference suppression sum-rate maximization Algorithm performance Signal processing System simulation convex optimization interference management Gain Signal to noise ratio |
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| Snippet | In downlink multiuser multiple-input-multiple-output (MIMO) systems, block diagonalization (BD) is a practical linear precoding scheme that completely... |
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| SubjectTerms | Applied sciences Approximation methods Block diagonalization Coding, codes convex optimization Covariance matrix Detection, estimation, filtering, equalization, prediction Downlink Equipments and installations Exact sciences and technology Information, signal and communications theory Interference interference management MIMO Mobile radiocommunication systems precoding Radiocommunications Signal and communications theory Signal to noise ratio Signal, noise sum-rate maximization Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) |
| Title | Modified Block Diagonalization Precoding in Multicell Cooperative Networks |
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