DISTRIBUTED CO-OPERATING NODES USING TIME REVERSAL
First Claim
1. A method of configuring a plurality of radio frequency transmission nodes into a distributed time reversal mirror for transmitting to a target, the method comprising:
- step for phase alignment of local clock references of all nodes of the plurality of radio frequency transmission nodes; and
step for frequency alignment of the local clock references of all nodes of the plurality of radio frequency transmission nodes.
1 Assignment
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Accused Products
Abstract
Dynamic, untethered array nodes are frequency, phase, and time aligned, and used to focus their transmissions of the same data coherently on a target, using time reversal. Alignment may be achieved separately for the radio frequency (RF) carriers and the data envelopes. Carrier alignment may be by phase conjugation. The data is distributed across the nodes. Data distribution and/or alignment may be performed by a Master node of the array. The nodes capture a sounding signal from the target, in the same time window. Each node converts the captured sounding signal to baseband, for example, using in-phase/quadrature downconversion. Each node stores the baseband samples of the sounding pulse. Each node convolves time-reversed samples of the sounding signal with the data, and upconverts the convolved data to radio frequency. The nodes emit their respective convolved and upconverted data so that the emissions focus coherently at the target.
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Citations
18 Claims
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1. A method of configuring a plurality of radio frequency transmission nodes into a distributed time reversal mirror for transmitting to a target, the method comprising:
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step for phase alignment of local clock references of all nodes of the plurality of radio frequency transmission nodes; and step for frequency alignment of the local clock references of all nodes of the plurality of radio frequency transmission nodes. - View Dependent Claims (2, 3, 4, 5)
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6. A method of configuring a plurality of radio frequency transmission nodes into a distributed time reversal mirror for transmitting to a target, the method comprising steps of:
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aligning phases of local clock references of all nodes of the plurality of radio frequency transmission nodes; aligning frequencies of the local clock references of all nodes of the plurality of radio frequency transmission nodes; aligning time references of all nodes of the plurality of radio frequency transmission nodes; distributing common data for transmission to the target across the plurality of nodes; receiving, at each node of the plurality of nodes, a sounding signal from the target within a common time capture window; generating, at said each node, a time-reversed sounding signal at carrier frequency, the time-reversed sounding signal of said each node being generated by sample-reversal of the common time capture window at baseband and phase-conjugation at carrier frequency; convolving, at said each node, the common data with the time-reversed sounding signal, thereby obtaining a transmission signal of said each node; and transmitting, from said each node, said transmission signal of said each node, wherein the step of transmitting is performed at the same time from all the nodes of the plurality of nodes for coherent time-reverse focusing on the target in time and space. - View Dependent Claims (7, 8, 9, 10)
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11. A node comprising an antenna, a radio frequency transceiver coupled to the antenna, a local oscillator, and a processor coupled to the transceiver to control operation of the transceiver, wherein the node is part of a plurality of nodes, the node comprising:
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means for phase alignment of the local oscillator with the local oscillators of other nodes of the plurality of nodes; and means for frequency alignment of the local oscillator with of the local oscillators of the other nodes of the plurality of nodes. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An article of manufacture comprising machine-readable storage medium with program code stored in the medium in a non-volatile manner, the program code, when executed by at least one processor of a node comprising an antenna, a radio frequency transceiver coupled to the antenna, a local oscillator, and a processor coupled to the transceiver to control operation of the transceiver, wherein the node is part of a plurality of nodes, configures the node to perform:
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phase alignment of local clock references of all nodes of the plurality of radio frequency transmission nodes; and frequency alignment of the local clock references of all nodes of the plurality of radio frequency transmission nodes. - View Dependent Claims (18)
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Specification