Microsoft Technology Licensing, LLC

Uber Technologies, Inc.

Miscrosoft Corporation

Nissanka Arachchige Bodhi Priyantha

Ranveer Chandra

Jie Jerry Liu

Stephen Edward Hodges

Tusher Chakraborty

Anirudh Badam

Julia Louise Meinershagen

Heping Shi

Thomas Moscibroda

Zerina Kapetanovic

Deepak Vasisht

Dimitrios Lymberopoulos

Anthony John Ferrese

Amy Kathleen Karlson

Matthai Philipose

Pan Hu

Evangelia Skiani

John Charles Krumm

Alice Jane Bernheim Brush

Jaime Brooks Teevan

Gerald Reuben DeJean

Shahriyar J Amini

Binh Ngoc Vu

Suman Kumar Nath

Lin Zhong

Jonathan Alan Dutra

John Helmes

Michel Goraczko

Jeremy Gummeson

Bojun Huang

Dimitrios Lymperopoulos

Vaibhav Singh

Aveek Ravishekhar Purohit

Yin Chen

Paramvir Bahl

Douglas Christopher Burger

Sharad Agarwal

Di Wang

Aman Kansal

David Chiyuan Chu

Lei Zhang

Gursharan Singh Sidhu

Eric I Horvitz

Oriana Riva

Changhu Wang

Manikanta Kotaru

Krishna Chintalapudi

Yuxiao Hu

Mike Nakahara

Lucas Neal Joppa

Mohammed Shoaib

Vaishnavi Nattar Ranganathan

Yuzhe Jin

Edward Hart

Vikram Subramaniam Iyer

Krishna Kant Chintalapudi

Chieh-Jan Mike Liang

Marcel Gavriliu

Deepak Ganesan

Alice Jane B Brush

Hong Lu

Jiaming Wang

Qiang Xu

Harsh Sandesh Desai

Chuhan Gao

Amanda Souza De Paula

Christopher Dekmezian

Heitor Soares Ramos Filho

Robert LiKamWa

Mari Hern

Kevin Timmons

Liqian Luo

Julia L Meinershagen

Stephen E Hodges

Jon Dutra

Jie Liu

Gerald Dejean

Robert Likamwa

The disclosure described herein configures a client device for communication using dynamic spectrum access within a frequency spectrum, such as television white space (TVWS), using a determined location of the client device based on location information, such as from a global positioning system. A dynamic spectrum access database of channels is accessed based on the location information. Available channels are determined for the client device from the channels based on the location information. A list of the available channels for use by the client device are transmitted to the client device, thereby allowing narrowband communication over the channels.

Communication using dynamic spectrum access based on channel selection

A deployment of sensors transmit radio frequency (RF) signals into an area of interest. The radar maps are generated from the reflected signals, including a static radar map and a dynamic radar map. Multipath and radar sidelobes are removed from the radar maps using a neural network to produce a density map. The neural network can be trained in two phases: a training phase that uses training data from a training site and a transfer learning phase that uses training data from the area of interest.

Radio frequency-based crowd analytics

A computing system including a processor configured to receive packet preamble binary data and packet header binary data associated with a satellite. The processor may generate a simulated signal that encodes the packet preamble binary data and the packet header binary data. The processor may receive a satellite downlink signal. Within each of a plurality of sample intervals of the satellite downlink signal, the processor may compute a respective correlation between the satellite downlink signal and at least a portion of the simulated signal. The processor may select an identified sample interval of the plurality of sample intervals based at least in part on the plurality of correlations. The processor may decode binary satellite signal data based at least in part on the identified sample of the satellite downlink signal. The processor may output the binary satellite signal data.

Correlating simulated signal and satellite downlink signal

Examples are disclosed that relate to improving security of radio frequency (RF) backscattered communication. In one example, a RF device includes a primary RF signal receiver, a secondary signal receiver, a signal mixer, and a transmitter. The primary RF signal receiver is configured to receive a RF carrier signal sent from a base station. The secondary signal receiver is configured to receive a masking signal from the base station. The signal mixer is configured to generate a response signal based at least on the RF carrier signal and generate a mixed signal by mixing the response signal and the masking signal. The transmitter is configured to broadcast the mixed signal, via backscattering, as a masked backscattered signal.

Signal masking for secure backscattered communication

The disclosure herein describes using satellites and ground sinks and/or stations for routing IoT device data packets from IoT devices. A target ground sink in range of the satellite is identified and an expected reception (ER) score for the target ground sink is calculated based on ER parameter data and location data of the satellite. A data packet in a first level of a multi-level data structure of the satellite is sent to the target ground sink and, based on an ER threshold exceeding the ER score, the packet is moved to a second level of the multi-level data structure, whereby the data packet is queued to be sent to another ground sink. The disclosure further includes using cell towers as ground sinks and/or using them for backhauling with other ground sinks. The flexibility of the disclosure enables large ground sink networks to be established, reducing latency of packet routing.

Satellite communication with distributed ground stations using a multi-level queue

The disclosure described herein configures a base station and client devices for communication using dynamic spectrum access within a frequency spectrum that includes selecting, from a list of available channels, a set of channels as active channels. The active channels include uplink channels and downlink channels. An uplink channel and a downlink channel are assigned to a plurality of client devices based on locations the client devices, wherein at least some client devices have active channels in common. Acknowledgements from the subset of client devices having the common active channel are grouped, the acknowledgements containing medium access control (MAC) commands specific to the subset of client devices, where each message of a plurality of messages on the uplink channels is followed by a downlink acknowledgement.

Channel control for communication using dynamic spectrum access

The disclosure described herein configures a multi-narrowband transceiver for communication within the television white space (TVWS) frequency spectrum using a log periodic filter, wherein the log periodic filter comprises a plurality of filter elements each having a filter frequency increasing periodically in a same frequency increasing factor (K). Each filter of the plurality of filter elements is configured to filter out second harmonics in a defined frequency range. The disclosure determines a TVWS channel for the communication and switches to a filter element of the plurality of filter elements corresponding to the determined TVWS channel. Data is transmitted and/or received over the TVWS channel using the filter element, thereby allowing narrowband communication over the TVWS channel.

Device communication over television white space

A method includes receiving one or more search terms at a mobile computing device while the mobile computing device is located at a particular location. A search query that includes the one or more search terms and a location history of the mobile computing device is transmitted to a server. The method also includes receiving one or more search results in response to the search query, where the one or more search results include content identified based on a predicted destination of the mobile computing device. An interface identifying the one or more search results is displayed at the mobile computing device.

Mobile search based on predicted location

The disclosure described herein configures a base station and client devices for communication using dynamic spectrum access within a frequency spectrum that includes selecting, from a list of available channels, a set of channels as active channels. The active channels include uplink channels and downlink channels, and the active channels are distributed among a plurality of base station radios of a base station. A different channel is assigned to different base station radios. At least one uplink channel and at least one downlink channel are assigned to a plurality of client devices based on locations the client devices, wherein at least some client devices have active channels in common. The client devices having the active channels in common are also grouped on shared channels and time slots assigned to the client devices in the group, thereby allowing narrowband communication over the channels by the client devices.

Techniques for blind distributed multi-user MIMO enable simultaneous decoding of multiple concurrent wireless transmissions without the need for coordination between wireless devices or a measurement phase. Wireless devices are permitted to transmit independently and at arbitrary times. Concurrent transmissions from wireless devices superimpose in the wireless channel and are received at various base stations. The base stations forward received data samples to a central entity (e.g., a cloud computing service), which uses known preambles to reliably estimate CFOs and channels between the transmitting devices and the receiving base stations while simultaneously recovering the data samples of the individual data streams.

Blind distributed multi-user MIMO for decoding multiple concurrent wireless transmissions

Growing community of inventors

Redmond, WA, United States of America

Nissanka Arachchige Bodhi Priyantha