United States Patent 9,900,066
Koo , et al. February 20, 2018
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.
Inventors:
Koo; Changsoo (Melville, NY), Olesen; Robert Lind (Huntington, NY)
Applicant:
Name
City
State
Country
Type
InterDigital Technology Corporation
Wilmington
DE
US
Assignee:
INTERDIGITAL TECHNOLOGY CORPORATION (Wilmington, DE)
Family ID:
1000003135812
Appl. No.:
15/357,600
Filed:
November 21, 2016
Prior Publication Data
Document Identifier
Publication Date
US 20170070268 A1 Mar 9, 2017
Related U.S. Patent Documents
Application Number
Filing Date
Patent Number
Issue Date
14224195 Mar 25, 2014 9509378
12983491 Apr 22, 2014 8705389
11118867 Jan 4, 2011 7864659
60598183 Aug 2, 2004
Current U.S. Class: 1/1
Current CPC Class: H04B 7/0417 (20130101); H04B 17/336 (20150115); H04L 1/0002 (20130101); H04L 1/0026 (20130101); H04L 5/0046 (20130101); H04L 5/0064 (20130101); H04L 5/006 (20130101); Y02D 50/10 (20180101); H04L 5/0023 (20130101); H04L 27/2601 (20130101)
Current International Class: H04B 7/04 (20170101); H04L 1/00 (20060101); H04L 5/00 (20060101); H04B 7/0417 (20170101); H04B 17/336 (20150101); H04L 27/26 (20060101)
Field of Search: ;375/224,225,227,260-262,265,267 ;370/208,210,277,278,282,295,335,342 ;455/500,501,503,67.11,67.13,69,70,88,552.1
PPP
"Intellectuals solve problems; geniuses prevent them." - Albert Einstein
