A study of opportunism for multiple-antenna systems
Recently proposed opportunistic beamforming exploits the multiuser diversity to reduce the feedback by not requiring the precoding information used for closed-loop schemes to be known at the transmitter. Opportunism could also be beneficially employed for other multiple-antenna transmission techniqu...
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| Veröffentlicht in: | IEEE transactions on information theory 2005-05, Vol.51 (5), p.1804-1814 |
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| container_title | IEEE transactions on information theory |
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| creator | Sharma, N. Ozarow, L.H. |
| description | Recently proposed opportunistic beamforming exploits the multiuser diversity to reduce the feedback by not requiring the precoding information used for closed-loop schemes to be known at the transmitter. Opportunism could also be beneficially employed for other multiple-antenna transmission techniques like cophasing and antenna selection. For opportunistic beamforming and antenna selection, we give closed-form expressions for throughput that closely approximate the performance of these schemes with a Proportionally Fair scheduler (PFS) at low signal-to-noise ratios (SNRs). For large number of transmit antennas, opportunistic cophasing has similar performance as opportunistic beamforming. Asymptotic dependence of the required number of users to achieve the gains of opportunism on the number of transmit antennas is exponential for opportunistic beamforming (and cophasing for large numbers of transmit antennas), and at best linear for opportunistic antenna selection. For multiple-antenna receivers, we additionally examine an opportunistic multiple-input multiple-output (MIMO) scheme that transmits multiple data streams simultaneously to the same user. |
| doi_str_mv | 10.1109/TIT.2005.846410 |
| format | Article |
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Opportunism could also be beneficially employed for other multiple-antenna transmission techniques like cophasing and antenna selection. For opportunistic beamforming and antenna selection, we give closed-form expressions for throughput that closely approximate the performance of these schemes with a Proportionally Fair scheduler (PFS) at low signal-to-noise ratios (SNRs). For large number of transmit antennas, opportunistic cophasing has similar performance as opportunistic beamforming. Asymptotic dependence of the required number of users to achieve the gains of opportunism on the number of transmit antennas is exponential for opportunistic beamforming (and cophasing for large numbers of transmit antennas), and at best linear for opportunistic antenna selection. 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Opportunism could also be beneficially employed for other multiple-antenna transmission techniques like cophasing and antenna selection. For opportunistic beamforming and antenna selection, we give closed-form expressions for throughput that closely approximate the performance of these schemes with a Proportionally Fair scheduler (PFS) at low signal-to-noise ratios (SNRs). For large number of transmit antennas, opportunistic cophasing has similar performance as opportunistic beamforming. Asymptotic dependence of the required number of users to achieve the gains of opportunism on the number of transmit antennas is exponential for opportunistic beamforming (and cophasing for large numbers of transmit antennas), and at best linear for opportunistic antenna selection. For multiple-antenna receivers, we additionally examine an opportunistic multiple-input multiple-output (MIMO) scheme that transmits multiple data streams simultaneously to the same user.</description><subject>Antennas</subject><subject>Applied sciences</subject><subject>Approximation</subject><subject>Array signal processing</subject><subject>Asymptotic properties</subject><subject>Bandwidth</subject><subject>Beamforming</subject><subject>Closed loop systems</subject><subject>Closed-form solution</subject><subject>Communication channels</subject><subject>Detection, estimation, filtering, equalization, prediction</subject><subject>Exact sciences and technology</subject><subject>Exact solutions</subject><subject>Feedback</subject><subject>Gain</subject><subject>Information, signal and communications theory</subject><subject>Mathematical analysis</subject><subject>MIMO</subject><subject>Multiple antennas</subject><subject>multiuser diversity</subject><subject>opportunistic beamforming</subject><subject>Receiving antennas</subject><subject>scheduling</subject><subject>Signal and communications theory</subject><subject>Signal to noise ratio</subject><subject>Signal, noise</subject><subject>Streams</subject><subject>Telecommunications and information theory</subject><subject>Throughput</subject><subject>Transmitters</subject><subject>Transmitting antennas</subject><subject>wireless system design</subject><issn>0018-9448</issn><issn>1557-9654</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNp9kL1rwzAQxUVpoWnauUMXU2g7OdFZki2NJfQjEOiSzkKWT-Dgr0r2kP--CgkEOnQ6jvu9d3ePkHugCwCqltv1dpFRKhaS5xzoBZmBEEWqcsEvyYxSkKniXF6TmxB2seUCshlhr0kYp2qf9C7ph6H349TVoU1c75N2asZ6aDA13YhdZ5KwDyO24ZZcOdMEvDvVOfl-f9uuPtPN18d69bpJLZMwpiAYiqqyljMnLcjCIgVkVVaUXBgXD8ogpxZLlZclRLKqlMOSU2DgOEo2Jy9H38H3PxOGUbd1sNg0psN-ClpRyJUs4p45ef6XzCRVlBd5BB__gLt-8l38QoMSirJoF6HlEbK-D8Gj04OvW-P3Gqg-ZK1j1vqQtT5mHRVPJ1sTrGmcN52tw1mWR1cmD9zDkasR8TzmGWdQsF_wYYZL</recordid><startdate>20050501</startdate><enddate>20050501</enddate><creator>Sharma, N.</creator><creator>Ozarow, L.H.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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Opportunism could also be beneficially employed for other multiple-antenna transmission techniques like cophasing and antenna selection. For opportunistic beamforming and antenna selection, we give closed-form expressions for throughput that closely approximate the performance of these schemes with a Proportionally Fair scheduler (PFS) at low signal-to-noise ratios (SNRs). For large number of transmit antennas, opportunistic cophasing has similar performance as opportunistic beamforming. Asymptotic dependence of the required number of users to achieve the gains of opportunism on the number of transmit antennas is exponential for opportunistic beamforming (and cophasing for large numbers of transmit antennas), and at best linear for opportunistic antenna selection. For multiple-antenna receivers, we additionally examine an opportunistic multiple-input multiple-output (MIMO) scheme that transmits multiple data streams simultaneously to the same user.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/TIT.2005.846410</doi><tpages>11</tpages></addata></record> |
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| subjects | Antennas Applied sciences Approximation Array signal processing Asymptotic properties Bandwidth Beamforming Closed loop systems Closed-form solution Communication channels Detection, estimation, filtering, equalization, prediction Exact sciences and technology Exact solutions Feedback Gain Information, signal and communications theory Mathematical analysis MIMO Multiple antennas multiuser diversity opportunistic beamforming Receiving antennas scheduling Signal and communications theory Signal to noise ratio Signal, noise Streams Telecommunications and information theory Throughput Transmitters Transmitting antennas wireless system design |
| title | A study of opportunism for multiple-antenna systems |
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