TECHNIQUES FOR CORRECTING FOR PHASE AND AMPLITUDE OFFSETS IN A MIMO RADIO DEVICE

Title:

TECHNIQUES FOR CORRECTING FOR PHASE AND AMPLITUDE OFFSETS IN A MIMO RADIO DEVICE

Document Type and Number:

WIPO Patent Application WO2004025841

Kind Code:

A3

Abstract:

Techniques are provided to correct for phase and amplitude mismatches in a radio device in order to maintain channel symmetry when communicating with another device using a multiple-input multiple output radio communication. Correction for the amplitude and phase mismatches among the plurality of transmitters and plurality of receivers of a device may be made at baseband using digital logic in the receiver path, the transmitter path or both paths of that device. Amplitude and phase offsets are determined among the plurality of radio transmitter and radio receiver paths by measuring phase and amplitude responses when supplying a signal to a transmitter in a first antenna path of the device and coupling the radio signal from a first antenna to a second antenna path of that device where the signal is down-converted by a receiver associated with the second antenna path.

Inventors:

VAIDYANATHAN CHANDRA (US)
SUGAR GARY L (US)

Application Number:

PCT/US2003/028126

Publication Date:

May 27, 2004

Filing Date:

September 09, 2003

Export Citation:

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Assignee:

COGNIO INC (US)
VAIDYANATHAN CHANDRA (US)
SUGAR GARY L (US)

International Classes:

H04J99/00; H01Q3/26; H04B1/04; H04B7/04; H04B17/00; (IPC1-7): H04B1/02; H04B1/04

Foreign References:

US6298092B1	2001-10-02
US6157340A	2000-12-05
US6037898A	2000-03-14
US6307882B1	2001-10-23
US6473467B1	2002-10-29

Other References: