United States Patent 8,705,389
Koo , et al. April 22, 2014
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Quality control scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems
Abstract
A method and apparatus for optimizing the system capacity of an Orthogonal Frequency Division Multiplexing (OFDM) system that uses with Multiple-Input Multiple-Output (MIMO) antennas. In a receiver, a target quality of service (QoS) metric and reference data rate are set. The target QoS metric may be set to a predetermined value and/or may be adjusted dynamically with respect to packet error rate (PER) by a slow outer-loop control processor. The QoS of received signals are compared to the target QoS. Depending on the comparison, the receiver generates a channel quality indicator (CQI) which is sent to the transmitter. The CQI is a one or two bit indicator which indicates to the transmitter to disable, adjust or maintain data transmission rates of particular sub-carriers, groups of sub-carriers per transmit antenna, or groups of sub-carriers across all transmit antennas. At the transmitter, the transmitted data rate is disabled, adjusted or maintained.
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Inventors: Koo; Chang-Soo (Melville, NY), Olesen; Robert Lind (Huntington, NY)
Applicant: Name City State Country Type
Koo; Chang-Soo
Olesen; Robert Lind
Melville
Huntington
NY
NY
US
US
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Family ID: 1000000489313
Appl. No.: 12/983,491
Filed: January 3, 2011
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Prior Publication Data
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Document Identifier Publication Date
US 20110096857 A1 Apr 28, 2011
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
11118867 Apr 29, 2005 7864659
60598183 Aug 2, 2004
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Current U.S. Class: 370/252 ; 370/203; 375/260
Current CPC Class: H04L 1/0026 (20130101)
Current International Class: H04J 1/16 (20060101)
Field of Search: ;370/203-210,229-235,241-252,310-350 ;375/260-265
PPP
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