Ipr Licensing, Inc.

Cognio, Inc.

Cisco Technology, Inc.

Emanate Wireless, Inc.

Diani Systems, Inc.

Telogy Networks, Inc.

Gary L Sugar

Chandra Vaidyanathan

Yohannes Tesfai

Neil Robert Diener

Robert M Masucci

William R Seed

David George Rahn

Karl A Miller

David Stuart Kloper

Sifen Luo

Jong Sup Baek

Anthony T Collins

D Andrew Floam

Michael F Toner

Brian Donald Hart

Matthew Aaron Silverman

Paul Jeffrey Stager

Zhigang Gao

Igal Gutkin

Brian F Kane

Sifen Lou

David Rahn

A wireless room occupancy monitor, system and training method are provided. The room occupancy monitor includes an antenna array configured to detect wireless transmissions from a tag device; a wireless transceiver configured to receive the wireless transmissions detected by the antenna array and produce receive signals; a processor configured to process the receive signals; and a motion sensor coupled to the processor and configured to wake up the processor in response to detecting when the tag device enters or exits a room. The monitor is configured to be mounted proximate an entryway to the room. After the motion sensor wakes up the processor, the processor is configured to power on the wireless transceiver and run an algorithm on a sequence of received signal strength estimates and array response vectors derived from the receive signals to determine when the tag device has entered or exited the room via the entryway.

Wireless room occupancy monitor

A Usage, Condition and Location System (UCLS) tag is provided, which is an active RFID tag that, in addition to location, is configured to determine the usage state and operating condition of a device. The UCLS tag includes sensors that measure physical activity of the associated equipment (vibration, magnetic activity, temperature, etc.). Algorithms may use the information obtained from the UCLS tags to map the measured sensor data to a contextual usage state and operating condition of the device.

Usage, condition and location tag and system

An equal gain composite beamforming technique which includes the constraint that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain composite beamforming technique.A method and apparatus are disclosed for a transmission technique by a wireless communications device which includes providing that the power applied to each transmit antenna may be equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. The device may determine a total transmit power and produce a multi-carrier signal for transmission. Accordingly, the device may apply a power to each of the N transmit antennas, for the multicarrier signal, which is equal to the total transmit power divided by N. Further, the device may produce a weight for each of the N transmit antennas used. The device may weight the multi-carrier signal for each antenna per the produced weight. Each transmit antenna signal may be amplified by an amplifier coupled to that antenna.

System and method for antenna diversity using equal power joint maximal ratio combining

As disclosed herein is a multiple-input multiple-output (MIMO) radio transceiver which may include a plurality of antennas operatively coupled to a first integrated circuit (IC). The first IC and the plurality of antennas may receive a first radio signal on a first radio frequency (RF) carrier and a second radio signal on a second RF carrier. The first RF carrier and the second RF carrier may be different carriers. The first radio signal and the second radio signal may have different bandwidths. The first IC may demodulate the first received radio signal to produce a first baseband signal and the second received radio signal to produce a second baseband signal. A second IC may be operatively coupled to the first IC and may recover data from at least the first baseband signal and the second baseband signal.

Multiple-input multiple-output radio transceiver

A monitoring system for a cold storage device such as a vapor compression refrigerator or freezer. The monitoring system learns operating characteristics of the cold storage device and issues alarm notifications when abnormal behavior is detected. Such a system can be used as an 'early warning system' to flag when a cold storage device is not operating properly. Such a system could be particularly valuable in applications that make mission-critical use of cold storage devices, e.g., biomedical or pharmaceutical research labs, blood or tissue banks, grocery stores, restaurants, and the like.

Cold storage health monitoring system

Configurations are provided for measuring electrical current flow through an AC power cable to a host device. An enclosure is provided that includes various components, such as components of an active RFID tag. A cable clamp is provided that is configured to attach the enclosure to the AC power cable. The cable clamp includes magnetic sensors that are responsive to electrical current flowing through the AC cable to generate signals indicative of the current flowing through the AC cable.

Active RFID asset tracking tag with current-sensing cable clamp

An equal gain composite beamforming technique which includes the constraint that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain composite beamforming technique.A method and apparatus are disclosed for a multiple input multiple output (MIMO) transmission technique by a wireless communications device which includes providing that the power applied to each transmit antenna may be equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. The device may produce a weight for each of the N transmit antennas used in MIMO transmission. Also, the device may determine a total transmit power and produce a multi-carrier signal for transmission. The device may weight the multi-carrier signal for each antenna per the produced weight. Further, the device may apply a power to each of the N transmit antennas, for the weighted multicarrier signal, which is equal to the total transmit power divided by N. Each transmit antenna signal may be amplified by an amplifier coupled to that antenna.

A MIMO radio transceiver to support processing of multiple signals for simultaneous transmission via corresponding ones of a plurality of antennas and to support receive processing of multiple signals detected by corresponding ones of the plurality of antennas. The radio transceiver provides, on a single semiconductor integrated circuit, a receiver circuit or path for each of a plurality of antennas and a transmit circuit or path for each of the plurality of antennas. Each receiver circuit downconverts the RF signal detected by its associated antenna to a baseband signal. Similarly, each transmit path upconverts a baseband signal to be transmitted by an assigned antenna.

Two or more data packets transmitted through a wireless channel are received using a receiver device. The two or more data packets are a result of two or more transmissions that are made sequentially in time at different center frequencies in order to span a desired bandwidth. Each data packet of the two or more data packets is transmitted at a single center frequency. Time differences and/or carrier phase differences among the two or more transmissions are estimated. A time-of-arrival of one or more data packets of the two or more data packets is calculated using each data packet of the two or more data packets and one or more of the estimated time differences, the different center frequencies, and the estimated carrier phase differences.

High resolution wireless indoor positioning system for legacy standards-based narrowband mobile radios

An equal gain composite beamforming technique which includes the constraint that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain composite beamforming technique.

Techniques are provided for distinguishing between different signal sources where multiple sensor devices receive RF energy in an area such that some sensors may receive the signals from the same source device. One technique involves using a received signal strength (RSS)-based positioning technique to distinguish between sources. Another technique involves building a pseudo-MAC identifier from received transmissions of a device in order to distinguish transmissions from that device with respect to other devices. Still another technique involves synchronizing the sensor devices and examining the resulting waveform data at each of the sensor devices to determine if they match sufficiently to indicate that they are from the same source device.

Resolving ambiguity with respect to locationing and classification of wireless transmitters

Multiple-input multiple-output (MIMO) wireless communication techniques are provided that involve mapping multiple spatial streams to corresponding modes of a wireless channel between a plurality of antennas of a first wireless communication device and a plurality of antennas of a second wireless communication device so as to allocate or distribute power unequally to the plurality of modes. In addition, techniques are provided herein to cyclically shift a mapping of spatial streams to modes of the channel.

Power allocation of spatial streams in MIMO wireless communication system

In a positioning system, each network access device in a first subset of N1 network access devices transmits a wireless location beacon signal, producing N1 wireless location beacon signals that are transmitted by the first subset. Each network access device in a second subset of N2 network access devices receives the Ni wireless location beacon signals from the first subset and calculates N1 TOAs from each of the N1 received wireless location beacon signals, producing N1&#xd7;N2 calculated TOAs by the second subset. Using one or more wireless transmissions, one or more network access devices transmits the location coordinates of the network access devices and transmits the N1&#xd7;N2 calculated TOAs, differences calculated among the N1&#xd7;N2 calculated TOAs, or a combination of one or more of the N1&#xd7;N2 calculated TOAs and one or more of the differences calculated among the N1&#xd7;N2 calculated TOAs.

Growing community of inventors

Rockville, MD, United States of America

Gary L Sugar