LEON TERUO METREAUD
Pilots at Paiute Pl, East Pepperell, MA
License number
Massachusetts A5293851
Issued Date
Feb 2016
Expiration Date
Feb 2021
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
6 Paiute Pl, East Pepperell, MA 01463
Professional information
I/Q Imbalance Estimation And Compensation For A Transmitter And A Receiver
US Patent:
2011001, Jan 20, 2011
Filed:
Apr 24, 2009
Appl. No.:
12/429723
Inventors:
Leon Teruo Metreaud - Pepperell MA, US
Hakan Inanoglu - Acton MA, US
Xiangdong Zhang - Westford MA, US
Zhengi Q. Chen - Acton MA, US
Hakan Inanoglu - Acton MA, US
Xiangdong Zhang - Westford MA, US
Zhengi Q. Chen - Acton MA, US
Assignee:
QUALCOMM INCORPORATED - San Diego CA
International Classification:
H04L 27/08, H04L 27/00, H04L 25/03
US Classification:
375296, 375316, 375345, 375295
Abstract:
Techniques for performing inphase/quadrature (I/Q) imbalance estimation and compensation are described. In one exemplary design, I/Q imbalances in a receiver may be estimated by (i) applying a continuous wave signal at different frequencies to the receiver and (ii) processing I and Q input samples from the receiver to determine I/Q imbalances at different frequencies. In another exemplary design, I/Q imbalances may be estimated by (i) downconverting an input RF signal with an LO signal that is offset in frequency from the input RF signal, (ii) transforming I and Q input samples from the receiver to the frequency domain to obtain I and Q symbols, and (iii) determining I/Q imbalances based on the I and Q symbols. In one exemplary design, I/Q imbalances may be corrected by compensating for frequency-dependent and frequency-independent I/Q imbalances separately. I/Q imbalances in a transmitter may also be estimated and compensated.
Antenna Array Configurations For High Throughput Mimo Wlan Systems
US Patent:
2009032, Dec 31, 2009
Filed:
Jun 30, 2008
Appl. No.:
12/165641
Inventors:
Hakan Inanoglu - Acton MA, US
John W. Ketchum - Harvard MA, US
Leon Metreaud - Pepperell MA, US
Mark S. Wallace - Bedford MA, US
John W. Ketchum - Harvard MA, US
Leon Metreaud - Pepperell MA, US
Mark S. Wallace - Bedford MA, US
Assignee:
QUALCOMM Incorporated - San Diego CA
International Classification:
H01Q 13/10, H01Q 1/24
US Classification:
343702, 343770
Abstract:
The present disclosure provides techniques for configuring multi-element antenna arrays. Such antenna arrays may be designed with slot pairs separated by λ/2 along perpendicular axes (e.g., x and y-directions). One such array may have four or more co-located antenna element pairs formed with cross slots having the same rotational orientation. Another such array may have four or more co-located antenna element pairs formed with some cross slots having the same rotational orientation and other cross slots having a different rotational orientation.
I/Q Imbalance Estimation And Correction In A Communication System
US Patent:
2009017, Jul 9, 2009
Filed:
Jan 4, 2008
Appl. No.:
11/969341
Inventors:
Hakan Inanoglu - Acton MA, US
Leon Metreaud - Pepperell MA, US
Mark S. Wallace - Bedford MA, US
Xiangdong Zhang - Westford MA, US
Leon Metreaud - Pepperell MA, US
Mark S. Wallace - Bedford MA, US
Xiangdong Zhang - Westford MA, US
Assignee:
QUALCOMM INCORPORATED - San Diego CA
International Classification:
H03D 3/24
US Classification:
375376
Abstract:
Certain aspects and embodiments provide for accurate measurement and estimation of imbalances between in-phase (I) and quadrature (Q) components of a complex baseband signal. The accuracy of I/Q phase imbalance estimates may be enhanced by conducting them on a transmitter and a receiver that are connected via a local, loopback connection and by removing cross-spectrum interference in transferred packets. Once these accurate I/Q phase imbalances are determined, they may be used to adjust a signal processed by the transmitter or the receiver to increase the performance and data throughput of communications using the signal.
Self-Calibration I/Q Imbalance Reduction
US Patent:
2012030, Nov 29, 2012
Filed:
Mar 29, 2012
Appl. No.:
13/433787
Inventors:
Leon Teruo Metreaud - Pepperell MA, US
Hakan Inanoglu - Acton MA, US
Hakan Inanoglu - Acton MA, US
Assignee:
QUALCOMM INCORPORATED - San Diego CA
International Classification:
H04B 15/00, H04W 24/00
US Classification:
375219, 375224
Abstract:
A method for a self-calibrating reduction in inphase/quadrature imbalance is described. An inphase/quadrature amplitude imbalance is calculated. A correction to the inphase/quadrature amplitude imbalance is applied. An estimated inphase/quadrature phase imbalance is calculated. Calculating an estimated inphase/quadrature phase imbalance includes calculating a loopback phase. A correction to the estimated inphase/quadrature amplitude imbalance is applied.