TIME-REVERSAL WIRELESS PARADIGM FOR INTERNET OF THINGS
First Claim
1. A method of connecting devices to a network, the method comprising:
- providing base stations that are connected to a network;
at each of the base stations, receiving probe signals from terminal devices that intend to communicate with the base station,for each of the terminal devices that intends to communicate with the base station, calculating 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 that the base station intends to transmit downlink data, determining a downlink transmit signal for the terminal device based on the downlink data and the corresponding signature waveform, andtransmitting the downlink signals to the terminal devices;
wherein each base station has a broadcast region such that terminal devices within the broadcast region can communicate with the base station, several base stations are positioned at locations such that they 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.
2 Assignments
0 Petitions
Accused Products
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.
31 Citations
38 Claims
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1. A method of connecting devices to a network, the method comprising:
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providing base stations that are connected to a network; at each of the base stations, receiving probe signals from terminal devices that intend to communicate with the base station, for each of the terminal devices that intends to communicate with the base station, calculating 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 that the base station intends to transmit downlink data, determining a downlink transmit signal for the terminal device based on the downlink data and the corresponding signature waveform, and transmitting the downlink signals to the terminal devices; wherein each base station has a broadcast region such that terminal devices within the broadcast region can communicate with the base station, several base stations are positioned at locations such that they 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of connecting devices to a network, the method comprising:
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providing a first base station and a second base station to a network; at the first base station configured to communicate with devices located within a first broadcast region, receiving probe signals from a first group of terminal devices located within the first broadcast region, calculating signature waveforms for the first group of terminal devices based on time-reversed waveforms of channel response signals derived from the received probe signals, determining downlink signals for the first group of terminal devices based on the corresponding signature waveforms, each downlink signal intended to be sent to one of the first group of terminal devices, different downlink signals intended to be sent to different ones of the first group of terminal devices, and transmitting the downlink signals to the first group of terminal devices; and at the second base station configured to communicate with devices located within a second broadcast region, receiving probe signals from a second group of terminal devices located within the second broadcast region, calculating signature waveforms for the second group of terminal devices based on time-reversed waveforms of channel response signals derived from the received probe signals, determining downlink signals for the second group of terminal devices based on the corresponding signature waveforms, each downlink signal intended to be sent to one of the second group of terminal devices, different downlink signals intended to be sent to different ones of the second group of terminal devices, and transmitting the downlink signals to the second group of terminal devices; wherein the first broadcast region overlaps the second broadcast region, at least one of the terminal devices is located within the overlapped broadcast region, the first and second base stations transmit the downlink signals using the same frequency band, and the downlink signals transmitted by the first and second base stations overlap in time. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of connecting devices to a network, the method comprising:
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providing base stations that are connected to a network; and at each of the base stations, receiving probe signals from terminal devices that intend to communicate with the base station, for each of the terminal devices that intends to communicate with the base station, calculating a signature waveform based on a time-reversed waveform of a channel response signal derived from the corresponding probe signal, and receiving a combined signal that includes uplink signals from multiple terminal devices, and determining the uplink signal from each terminal device based on the combined signal and the corresponding signature waveform for the terminal device; wherein each base station has a broadcast region such that terminal devices within the broadcast region can communicate with the base station, several base stations are positioned at locations such that they have overlapping broadcast regions, several terminal devices are located within the overlapped broadcast regions, different terminal devices transmit uplink signals to a common base station using a common frequency band, and some uplink signals transmitted by the terminal devices intended for base stations having overlapping broadcast regions also overlap in time. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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32. A system for connecting multiple devices to a network, the system comprising:
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base stations, in which each base station comprises a network port for connecting to a network, an input module to receive probe signals from terminal devices that intend to communicate with the base station, a data processor to, for each of the terminal devices that intends to communicate with the base station, calculate a signature waveform based on a time-reversed waveform of a channel response signal derived from the corresponding probe signal, and for each of the terminal devices that the base station intends to transmit downlink data, determine a downlink transmit signal for the terminal device based on the downlink data and the corresponding signature waveform, and an output module to transmit the downlink signals to the terminal devices; wherein each base station has a broadcast region such that terminal devices within the broadcast region can communicate with the base station, several base stations are positioned at locations such that they have overlapping broadcast regions, and the base stations are configured to transmit the downlink signals using a common frequency band. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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Specification