InterDigital Inc (IDCC)

[Gamco]

United States Patent 9,509,378
Koo , et al. November 29, 2016

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 (Melville, NY)

Applicant:


Name

City

State

Country

Type


InterDigital Technology Corporation
Wilmington
DE
US


Assignee:
InterDigital Technology Corporation (Wilmington, DE)


Family ID:
1000002261433

Appl. No.:
14/224,195

Filed:
March 25, 2014


Prior Publication Data






Document Identifier

Publication Date

US 20140205037 A1 Jul 24, 2014



Related U.S. Patent Documents









Application Number

Filing Date

Patent Number

Issue Date

12983491 Jan 3, 2011 8705389
11118867 Jan 4, 2011 7864659
60598183 Aug 2, 2004




Current U.S. Class: 1/1
Current CPC Class: H04B 7/0417 (20130101); H04L 1/0002 (20130101); H04L 1/0026 (20130101); H04L 5/006 (20130101); H04L 5/0046 (20130101); H04L 5/0064 (20130101); H04L 5/0023 (20130101); Y02B 60/31 (20130101)
Current International Class: H04J 11/00 (20060101); H04B 7/04 (20060101); H04L 1/00 (20060101); H04L 5/00 (20060101)
Field of Search: ;370/203-210,229-235,241-252,310-350 ;375/260-265

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