Kevin M Powell

US Patent:

20070126585, Jun 7, 2007

Filed:

Dec 6, 2005

Appl. No.:

11/294464

Inventors:

Yuri Okunev - Middle Island NY, US
Kevin Powell - Annapolis MD, US
Michael Arneson - Finksburg MD, US
William Bandy - Gambrills MD, US

Assignee:

Symbol Technologies, Inc. - Holtsville NY

International Classification:

G08B 13/14
H04Q 5/22

US Classification:

340572700, 340010100, 340572200

Abstract:

An embodiment of the present invention provides a system including a plurality of radio frequency identification (RFID) tags and a reader. Each RFID tag of the plurality of RFID tags backscatter transmits a signal. In one embodiment, the reader includes a plurality of antennas and a signal processor. In another embodiment, the system includes a signal processor and a plurality of readers each including an antenna. In either embodiment, each antenna receives a plurality of signals corresponding to the backscatter transmitted signals. The signal processor combines the received plurality of signals to produce an output signal.

US Patent:

20070177694, Aug 2, 2007

Filed:

Jan 17, 2006

Appl. No.:

11/332220

Inventors:

Yuri Okunev - Middle Island NY, US
Kevin Powell - Annapolis MD, US

Assignee:

Symbol Technologies, Inc. - Holtsville NY

International Classification:

H04L 27/22

US Classification:

375333000, 340010100, 340572400

Abstract:

The present invention provides methods and apparatuses for demodulation and decoding of backscattered RFID tag signals, represented by their in-phase and quadrature components at the output of the demodulator in the receiver portion of a reader interrogator. Correlation coefficients for the in-phase and quadrature components of the received signal are calculated over a shifted bit interval. Performing a correlation over a shifted bit interval relative to the real bit interval allows the base-band receiver to involve a two-bit interval in making a decision about each transmitted bit. In contrast, in a conventional decoding algorithm, a single bit interval is involved in the decision-making process. Thus, the current method provides a 3 dB energy gain compared to the conventional method. A single zero-mean reference signal is used to compute correlation coefficients, eliminating constant components of the received signal, and simplifying digital implementation of the base-band receiver. A value of the output data is determined based on the combined correlation coefficients.

US Patent:

20080112885, May 15, 2008

Filed:

Sep 6, 2007

Appl. No.:

11/851236

Inventors:

Yuri Okunev - Middle Island NY, US
William Robert Bandy - Gambrills MD, US
Roger Allen Davenport - Plantation FL, US
Kevin James Powell - Annapolis MD, US

Assignee:

Innurvation, Inc. - Columbia MD

International Classification:

A61K 49/00
H04L 7/00
H04B 1/707

US Classification:

424 91, 375141, 375145, 375E01002

Abstract:

Embodiments of the present invention are directed to acoustic data transmission using a spreading code. A system for acoustic data transmission includes an ingestible capsule and an acoustic receiver. The ingestible capsule includes a modulator, a spreader, and an acoustic transmitter. The modulator modulates data according to a modulation scheme. The spreader spreads the modulated data according to a spreading code. The acoustic transmitter acoustically transmits the modulated and spread data through a body of an animal. The acoustic receiver includes an acoustic transducer a de-spreader and a demodulator. The acoustic transducer receives the acoustically transmitted signal and forms an electrical signal therefrom. The de-spreader de-spreads the received signal in accordance with the spreading code. The demodulator demodulates the received and de-spread signal in accordance with the modulation scheme, wherein a phase of the spreading code is synchronized with the received signal whereby a signal-to-noise ratio of the received signal is increased.