Performance of Orthogonal Beamforming for SDMA With Limited Feedback
On the multiantenna broadcast channel, the spatial degrees of freedom support simultaneous transmission to multiple users. The optimal multiuser transmission, which is known as dirty paper coding, is not directly realizable. Moreover, close-to-optimal solutions such as Tomlinson-Harashima precoding...
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| Vydáno v: | IEEE transactions on vehicular technology Ročník 58; číslo 1; s. 152 - 164 |
|---|---|
| Hlavní autoři: | , , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
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New York, NY
IEEE
01.01.2009
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 0018-9545, 1939-9359 |
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| Abstract | On the multiantenna broadcast channel, the spatial degrees of freedom support simultaneous transmission to multiple users. The optimal multiuser transmission, which is known as dirty paper coding, is not directly realizable. Moreover, close-to-optimal solutions such as Tomlinson-Harashima precoding are sensitive to channel state information (CSI) inaccuracy. This paper considers a more practical design called per user unitary and rate control (PU2RC), which has been proposed for emerging cellular standards. PU2RC supports multiuser simultaneous transmission, enables limited feedback, and is capable of exploiting multiuser diversity. Its key feature is an orthogonal beamforming (or precoding) constraint, where each user selects a beamformer (or precoder) from a codebook of multiple orthonormal bases. In this paper, the asymptotic throughput scaling laws for PU2RC with a large user pool are derived for different regimes of the signal-to-noise ratio (SNR). In the multiuser interference-limited regime, the throughput of PU2RC is shown to logarithmically scale with the number of users. In the normal SNR and noise-limited regimes, the throughput is found to scale double logarithmically with the number of users and linearly with the number of antennas at the base station. In addition, numerical results show that PU2RC achieves higher throughput and is more robust against CSI quantization errors than the popular alternative of zero-forcing beamforming if the number of users is sufficiently large. |
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| AbstractList | On the multiantenna broadcast channel, the spatial degrees of freedom support simultaneous transmission to multiple users. The optimal multiuser transmission, which is known as dirty paper coding, is not directly realizable. Moreover, close-to-optima [abstract truncated by publisher]. The optimal multiuser transmission, which is known as dirty paper coding, is not directly realizable. [...] close-to-optimal solutions such as Tomlinson-Harashima precoding are sensitive to channel state information (CSI) inaccuracy. On the multiantenna broadcast channel, the spatial degrees of freedom support simultaneous transmission to multiple users. The optimal multiuser transmission, which is known as dirty paper coding, is not directly realizable. Moreover, close-to-optimal solutions such as Tomlinson-Harashima precoding are sensitive to channel state information (CSI) inaccuracy. This paper considers a more practical design called per user unitary and rate control (PU2RC), which has been proposed for emerging cellular standards. PU2RC supports multiuser simultaneous transmission, enables limited feedback, and is capable of exploiting multiuser diversity. Its key feature is an orthogonal beamforming (or precoding) constraint, where each user selects a beamformer (or precoder) from a codebook of multiple orthonormal bases. In this paper, the asymptotic throughput scaling laws for PU2RC with a large user pool are derived for different regimes of the signal-to-noise ratio (SNR). In the multiuser interference-limited regime, the throughput of PU2RC is shown to logarithmically scale with the number of users. In the normal SNR and noise-limited regimes, the throughput is found to scale double logarithmically with the number of users and linearly with the number of antennas at the base station. In addition, numerical results show that PU2RC achieves higher throughput and is more robust against CSI quantization errors than the popular alternative of zero-forcing beamforming if the number of users is sufficiently large. |
| Author | Heath, Robert W. Andrews, Jeffrey G. Huang, Kaibin |
| Author_xml | – sequence: 1 givenname: Kaibin surname: Huang fullname: Huang, Kaibin email: huangkb@ieee.org organization: Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong – sequence: 2 givenname: Jeffrey G. surname: Andrews fullname: Andrews, Jeffrey G. email: jandrews@ece.utexas.edu organization: Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX – sequence: 3 givenname: Robert W. surname: Heath fullname: Heath, Robert W. email: rheath@ece.utexas.edu organization: Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX |
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| Keywords | Performance evaluation Parameter estimation space division multiplexing Current source converter Base station Information rate Feedback regulation Multiuser channels Beam forming Codebook Coding Channel estimation Broadcast channels Traffic control feedback communication Antenna Multiple access Quantization error Coding circuit Flow rate regulation Teletraffic Information transmission Space division multiple access Scaling law Traffic management Optimal solution Numerical simulation Signal to noise ratio |
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| SubjectTerms | Applied sciences Array signal processing Asymptotic properties Base stations Beamforming Broadcast channels Broadcasting Cellular Channel state information Channels Coding, codes Control systems Control theory Convertors Detection, estimation, filtering, equalization, prediction Electrical engineering. Electrical power engineering Electrical machines Exact sciences and technology Feedback feedback communication Information, signal and communications theory Interference constraints Multiaccess communication multiuser channels Noise robustness Signal and communications theory Signal to noise ratio Signal, noise space division multiplexing Studies Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Throughput Transmission and modulation (techniques and equipments) |
| Title | Performance of Orthogonal Beamforming for SDMA With Limited Feedback |
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