Distributed co-operating nodes using time reversal
First Claim
1. A method of transmitting from a plurality of nodes, the method comprising steps of:
- synchronizing each node of the plurality of nodes to a common time reference of all nodes of the plurality of nodes, so that all nodes of the plurality of nodes are enabled to transmit synchronously following a predetermined synchronization period after a trigger signal is sent from a trigger node of the plurality of nodes;
obtaining at said each node of the plurality of nodes information sufficient to transmit from said each node a time-reversed signal corresponding to said each node, the time-reversed signal corresponding to said each node being such that when all nodes of the plurality of nodes synchronously transmit respective time-reversed signals, the time-reversed signals transmitted by all nodes of the plurality of nodes combine spatially and temporally to focus on a subject, the step of obtaining comprising steps of receiving at said each node one or more waveforms resulting from a sounding signal, and time-reversing at said each node the one or more waveforms resulting from the sounding signal;
sending the trigger signal from the trigger node of the plurality of nodes; and
transmitting the time-reversed signals from all nodes of the plurality of nodes, one of the time-reversed signals per corresponding node, so that a combination of the plurality of time-reversed signals is spatially and temporally focused on the subject, the step of transmitting being performed in response to expiration of the predetermined synchronization period following the step of sending the trigger signal;
wherein the nodes of the plurality of nodes art untethered ad hoc nodes movable relative to each other, and each node of the plurality of nodes has a different physical clock.
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Abstract
Methods and systems for coherent distributed communication techniques using time reversal are disclosed. In one aspect, cooperating nodes of a cluster can move relative to each other and relative to an intended receiver of the nodes'"'"' data transmissions. The nodes are synchronized to a common time reference, and data for transmission from the cluster is distributed to the nodes. The intended receiver sends a sounding signal to the nodes. Each node receives the sounding signal, obtains the channel response between the intended receiver and itself, and time-reverses the channel response. Each node then convolves its time-reversed channel response with the data to obtain the node'"'"'s convolved data. Each node waits a predetermined time following the time reference signal, as determined based on the common time reference. At the expiration of the predetermined time period, the nodes simultaneously transmit their convolved data.
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Citations
30 Claims
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1. A method of transmitting from a plurality of nodes, the method comprising steps of:
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synchronizing each node of the plurality of nodes to a common time reference of all nodes of the plurality of nodes, so that all nodes of the plurality of nodes are enabled to transmit synchronously following a predetermined synchronization period after a trigger signal is sent from a trigger node of the plurality of nodes; obtaining at said each node of the plurality of nodes information sufficient to transmit from said each node a time-reversed signal corresponding to said each node, the time-reversed signal corresponding to said each node being such that when all nodes of the plurality of nodes synchronously transmit respective time-reversed signals, the time-reversed signals transmitted by all nodes of the plurality of nodes combine spatially and temporally to focus on a subject, the step of obtaining comprising steps of receiving at said each node one or more waveforms resulting from a sounding signal, and time-reversing at said each node the one or more waveforms resulting from the sounding signal; sending the trigger signal from the trigger node of the plurality of nodes; and transmitting the time-reversed signals from all nodes of the plurality of nodes, one of the time-reversed signals per corresponding node, so that a combination of the plurality of time-reversed signals is spatially and temporally focused on the subject, the step of transmitting being performed in response to expiration of the predetermined synchronization period following the step of sending the trigger signal; wherein the nodes of the plurality of nodes art untethered ad hoc nodes movable relative to each other, and each node of the plurality of nodes has a different physical clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of transmitting from a first node of a plurality of nodes, the method comprising steps of:
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synchronizing the first node to a common time reference of the plurality of nodes, so that all nodes of the plurality of nodes are enabled to transmit synchronously following a predetermined synchronization period after a trigger signal is sent from a trigger node of the plurality of nodes; obtaining at the first node information sufficient to transmit from the first node a time-reversed signal corresponding to the first node such that when all nodes of the plurality of nodes synchronously transmit respective time-reversed signals, the time-reversed signals transmitted by all nodes of the plurality of nodes combine spatially and temporally to focus on an intended receiver, the step of obtaining comprising steps of receiving at the first node one or more waveforms caused by a sounding signal emitted by the intended receiver, and time-reversing at the first node the one or more waveforms received at the first node, resulting in the first node obtaining a time-reversed channel response between the first node and the subject; receiving the trigger signal at the first node; and transmitting from the first node the time-reversed signal corresponding to the first node in response to expiration of the predetermined synchronization period following the trigger node sending the trigger signal; wherein all nodes of the plurality of nodes are untethered ad hoc nodes movable relative to each other, and each node of the plurality of nodes has a different physical clock. - View Dependent Claims (12, 13, 14)
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15. A node comprising an antenna, a transceiver coupled to the antenna, and a processor coupled to the transceiver to control operation of the transceiver, wherein the node is part of a plurality of cooperative nodes, the node being configured to:
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synchronize the node to a common time reference of the plurality of cooperative nodes, so that all nodes of the plurality of cooperative nodes are enabled to transmit synchronously following a predetermined synchronization period after a trigger signal is sent from a trigger node of the plurality of cooperative nodes; obtain at the node information sufficient to transmit from the node a time-reversed signal corresponding to the node, the time-reversed signal corresponding to the node being such that when all nodes of the plurality of cooperative nodes synchronously transmit respective time-reversed signals, the time-reversed signals transmitted by all nodes of the plurality of cooperative nodes combine spatially and temporally to focus on an intended receiver of the time-reversed signals, wherein the node is configured to obtain the information by receiving a sounding signal from the intended receiver, and time-reversing the sounding signal received at the node, resulting in the node obtaining a time-reversed channel response between the node and the intended receiver; receive the trigger signal at the node; and transmit from the node the time-reversed signal corresponding to the node in response to expiration of the predetermined synchronization period following the trigger node sending the trigger signal; wherein all nodes of the plurality of cooperative nodes are untethered ad hoc nodes movable relative to each other, and each node of the plurality of cooperative nodes has a different physical clock. - View Dependent Claims (16, 17, 18, 19)
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20. A system comprising a plurality of nodes, each node of the plurality of nodes comprising an antenna, a transceiver coupled to the antenna, and a processor coupled to the transceiver to control operation of the transceiver, wherein the plurality of nodes is configured to:
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synchronize each node of the plurality of nodes to a common time reference of all nodes of the plurality of nodes, so that all nodes of the plurality of nodes are enabled to transmit synchronously following a predetermined synchronization period after a trigger signal is sent from a trigger node of the plurality of nodes; obtain at said each node of the plurality of nodes information sufficient to transmit from said each node a time-reversed signal corresponding to said each node, the time-reversed signal corresponding to said each node being such that when all nodes of the plurality of nodes synchronously transmit respective time-reversed signals, the time-reversed signals transmitted by all nodes of the plurality of nodes combine spatially and temporally to focus on a subject, wherein the plurality of nodes is configured to obtain the information by receiving at said each node one or more waveforms caused by a sounding signal, and time-reversing at said each node the one or more waveforms received at said each node to result in said each node obtaining a time-reversed channel response between said each node and the subject; send the trigger signal from the trigger node of the plurality of nodes; and transmit the time-reversed signals from all nodes of the plurality of nodes, a time-reversed signal per corresponding node, so that a combination of the plurality of time-reversed signals is spatially and temporally focused on the subject, the time-reversed signals being transmitted in response to expiration of the predetermined synchronization period following sending of the trigger signal; wherein the nodes of the plurality of nodes are untethered ad hoc nodes movable relative to each other, and each node of the plurality of nodes has a different physical clock. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of transmitting from a plurality of nodes, the method comprising steps of:
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step for synchronizing each node of the plurality of nodes to a common time reference of all nodes of the plurality of nodes, so that all nodes of the plurality of nodes are enabled to transmit synchronously following a predetermined synchronization period after a trigger signal is sent from a trigger node of the plurality of nodes; step for obtaining at said each node of the plurality of nodes information sufficient to transmit from said each node a time-reversed signal corresponding to said each node, the time-reversed signal corresponding to said each node being such that when all nodes of the plurality of nodes synchronously transmit respective time-reversed signals, the time-reversed signals transmitted by all nodes of the plurality of nodes combine spatially and temporally to focus on a subject; sending the trigger signal from the trigger node of the plurality of nodes; and step for transmitting the time-reversed signals from all nodes of the plurality of nodes, a one of the time-reversed signals per corresponding node, so that a combination of the plurality of time-reversed signals transmitted from all nodes of the plurality of nodes is spatially and temporally focused on the subject, the step of transmitting being performed in response to expiration of the predetermined synchronization period following the step of sending the trigger signal; wherein the nodes of the plurality of nodes are untethered ad hoc nodes movable relative to each other, and each node of the plurality of nodes has a different physical clock.
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Specification