Time-reversal wireless paradigm for internet of things

Patent metadata

Field	Value
Publication number	US-9402245-B2
Application number	US-201514943648-A
Country	US
Kind code	B2
Filing date	Nov 17, 2015
Priority date	Mar 10, 2014
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A method of connecting devices to a network is provided. The method includes providing base stations connected to a network, and at each of the base stations, receiving probe signals from terminal devices. For each of the terminal devices, the base station calculates a signature waveform based on a time-reversed waveform of a channel response signal derived from the corresponding probe signal. For each of the terminal devices, the base station determines a downlink transmit signal for the terminal device based on the downlink data and the corresponding signature waveform, and transmits the downlink signals to the terminal devices. Several base stations have overlapping broadcast regions, several terminal devices are located within the overlapped broadcast regions, the base stations transmit the downlink signals using a same frequency band, and some downlink signals transmitted by base stations having overlapping broadcast regions also overlap in time.

First claim

What is claimed is:

1. A system comprising:
a first base station having a first broadcast region in which the first base station can communicate with remote devices wirelessly, the first base station comprising:
at least one electronic circuit connected to a network;
at least one antenna;
at least one receiver circuit configured to receive a first wireless signal from a first remote device;
at least one processor configured to
determine a first location specific signature from the first wireless signal, the first location specific signature being associated with a location of the first remote device, and
generate first transmit data signals based on data intended for the first remote device and the first location specific signature, the first transmit data signals having frequencies within a first spectral band; and

at least one transmitter circuit configured to transmit the first transmit data signals wirelessly to the first remote device;

a second base station having a second broadcast region in which the second base station can communicate with remote devices wirelessly, wherein the second base station is configured to transmit second wireless signals having frequencies within a second spectral band, the second broadcast region at least partially overlaps the first broadcast region, and the second spectral band at least partially overlaps the first spectral band.

2. The system of claim 1 in which the at least one processor comprises a first processor for determining the first location specific signature and a second processor for determining the first downlink transmit waveform.

3. The system of claim 1 in which the at least one processor comprises a first processor for determining the first location specific signature and a second processor for introducing a rate back-off factor.

4. The system of claim 1 in which the at least one receiver circuit is configured to receive a second wireless signal from a second remote device, and the at least one processor is configured to
determine a second location specific signature from the second wireless signal, the second location specific signature being associated with a location of the second remote device, and
generate second transmit data signals based on data intended for the second remote device and the second location specific signature.

5. A system comprising;
a first device and a second device, in which at least one of the first and second devices comprises an electrical appliance;
a first base station configured to
receive a first wireless signal from the first device and a second wireless signal from the second device,
determine a first location specific signature for the first device, the first location specific signature being associated with a location of the first device,
determine a second location specific signature for the second device, the second location specific signature being associated with a location of the second device,
use the first location specific signature to generate first data signals to be sent to the first device, and
use the second location specific signature to generate second data signals to be sent to the second device; and

a second base station having a second broadcast region in which the second base station is configured to
transmit third data signals having frequencies within a second spectral band, the second broadcast region at least partially overlaps the first broadcast region, and the second spectral band at least partially overlaps the first spectral band.

6. The system of claim 5 in which the first base station is configured to combine the first data signals and second data signals into combined signals and send the combined signals wirelessly to the first and second devices simultaneously.

7. The system of claim 5 in which the first base station is configured to introduce a rate back-off factor in the first transmit data signals.

8. The system of claim 7 in which the rate back-off factor is between 2 and 64.

9. The system of claim 7 in which the first base station comprises a first processor for determining the first location specific signature and a second processor for introducing the rate back-off factor.

10. The system of claim 7 in which the first base station comprises a processor for determining the first location specific signature and also introducing the rate back-off factor.

11. The system of claim 5 in which the first base station comprises a first processor for determining the first location specific signature and a second processor for generating the first data signals using the first location specific signature.

12. The system of claim 5 in which the first base station comprises a processor for determining the first location specific signature and also generating the first data signals using the first location specific signature.

13. The system of claim 5 in which at least one of the first and second devices comprises an environment sensor, a utility meter, a lighting device, an audio-video device, a camera, a phone, a climate control system, a power generator, a timing device, a plant care device, clothing, a food container, a home appliance, a beacon, a component in an assembly line, a vehicle, or a robot.

14. The system of claim 5 , comprising at least one of an environment sensor hub, a utility meter hub, an electric appliance, a lighting device, an audio-video device, a camera, a phone, a climate control system, a power generator, a timing device, a plant care device hub, a food container hub, a beacon hub, a component in an assembly line, a vehicle, or a robot, in which the first base station is part of the environment sensor hub, the utility meter hub, the electric appliance, the lighting device, the audio-video device, the camera, the phone, the climate control system, the power generator, the timing device, the plant care device hub, the food container hub, the beacon hub, the component in the assembly line, the vehicle, or the robot.

Assignees

• Origin Wireless Inc

Inventors

• Chen Yan
• Ma Hang
• Han Yi
• Lai Hung-Quoc Duc
• Liu K J Ray

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L25/0204 Primary

  of multiple channels · CPC title

• H04W72/30 Primary

  Resource management for broadcast services · CPC title

• H04W72/005 Primary

  Electricity · mapped topic