Techniques and systems for providing data over power in communications based on time reversal

• US 8,498,658 B2
• Filed: 09/03/2010
• Issued: 07/30/2013
• Est. Priority Date: 09/03/2009
• Status: Active Grant

• Current Assignee: Ziva Corporation
• Original Assignee: Ziva Corporation
• Inventors: Smith, David F., Husain, Anis
• Primary Examiner(s): Tran, Tuan A
• Application Number:
  US13/142,250
• Publication Number:
  US 20120155515A1
• Time in Patent Office: 1,061 Days
• Field of Search: 455/25, 455/39, 455/41.2, 455/500, 455/504, 455/505, 455/506, 455/63.1, 455/63.4, 455/65, 455/67.11, 455/67.13, 455/67.15, 455/67.16, 455/561, 455/114.2, 455/296, 375/141, 375/143, 375/152, 375/229, 375/232, 375/242, 375/245, 375/346, 375/347, 375/348
• US Class Current: 455/506
• CPC Class Codes: H04L 25/0212 of impulse response
• CPC Class Codes: H04L 25/03133 with a non-recursive structure H04L25/03127 takes precedence
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/03834 using pulse shaping

Abstract

Techniques, apparatuses and systems for providing communications based on time reversal of a channel impulse response of a pulse in a transmission channel between a transmitter and a receiver to enhance reception and detection of a pulse at the receiver against various effects that can adversely affect and complicate the reception and detection of the pulse at the receiver.

Claims

1. A method for communications, comprising:

at a base that transmits and receives communication signals,

emitting an impulse-pulse s(t) in multiple directions;

in response to emitting the impulse-pulse s(t), detecting at a first angular orientation and over a first solid-angle a channel impulse response, h(t), reflected from a remote target, wherein;

the first angular orientation comprises first 3-D angular coordinates, (θ

, φ

), in a coordinate system with an origin at the base;

the channel impulse response, h(t), comprises copies of the impulse-pulse s(t), each copy of the impulse-pulse s(t) provided to the remote target at a different time based on a length of a respective path traveled by the respective copy of the impulse-pulse s(t) through a communication channel between the base and the remote target;

reversing in time domain the channel impulse response h(t);

amplifying the time reversed channel impulse response h(−

t);

transmitting in the multiple directions the amplified time reversed channel impulse response, Gh(−

t); and

detecting from the multiple directions an amplified channel impulse response, Gh(t), based on residual portions of an amplified impulse-pulse Gs(t) reflected from the remote target, wherein the amplified impulse-pulse Gs(t) comprises copies of the impulse-pulses s(t) included in the transmitted amplified time reversed channel impulse response, Gh(−

t) provided to the remote target at the same time.

2. The method of claim 1, wherein:

the base and the remote target are wireless radio frequency (RF) communication devices.

3. The method of claim 1, wherein:

controlling the amplifying of the time reversed channel impulse response at the base so that the amplified channel impulse response that reaches the remote target has an energy sufficiently high to cause a damage to the remote target.

4. The method of claim 1, wherein:

controlling the amplifying of the time reversed channel impulse response at the base so that the amplified channel impulse response that reaches the remote target has an energy sufficiently high to deliver power to the remote target.

5. A method for communications, comprising:

emitting an impulse-pulse s(t) in multiple directions;

in response to emitting the impulse-pulse s(t), detecting at a first angular orientation and over a first solid-angle a channel impulse response, h(t), reflected from a remote target, wherein;

the first angular orientation comprises first 3-D angular coordinates, (θ

, φ

), in a coordinate system with an origin at the base;

the channel impulse response, h(t), comprises copies of the impulse-pulse s(t), each copy of the impulse-pulse s(t) provided to the remote target at a different time based on a length of a respective path traveled by the respective copy of the impulse-pulse s(t) through a communication channel between the base and the remote target;

reversing in time domain the channel impulse response h(t);

amplifying the time reversed channel impulse response h(−

t);

transmitting in multiple directions the amplified time reversed channel impulse response, gh(−

t);

detecting at the first angular orientation and over the first solid-angle an amplified impulse-pulse, gs(t) reflected from the remote target, wherein the amplified impulse-pulse, gs(t) comprises copies of the impulse-pulses s(t) included in the transmitted amplified time reversed channel impulse response, gh(−

t) provided to the remote target at the same time; and

subsequently,

detecting at the first angular orientation and over the first solid-angle a data stream, s(t), emitted by the remote target.

6. A base device comprising:

a receiver comprising;

an antenna comprising a scanning mode to detect;

a channel impulse response, h(t), reflected from a remote target, wherein the channel impulse response, h(t), comprises copies of an impulse-pulse s(t) emitted by the base, each copy of the impulse-pulse s(t) provided to the remote target at a different time based on a length of a respective path traveled by the respective copy of the impulse-pulse s(t) through a communication channel between the base and the remote target;

an amplified impulse-pulse, gs(t) reflected from the remote target, wherein the amplified impulse-pulse gs(t) comprises copies of impulse-pulses s(t) included in a transmitted amplified time reversed channel impulse response, gh(−

t) provided to the remote target at the same time; and

a data stream, s(t), emitted by the remote target; and

an analog-to-digital converter (ADC) coupled to the antenna, the ADC to digitize the detected channel impulse response h(t) into a channel impulse response waveform;

a waveform processor communicatively coupled to the receiver, the waveform processor to reverse in time domain the channel impulse response waveform; and

an omnidirectional transmitter communicatively coupled to the waveform processor and comprising an amplifier, the omnidirectional transmitter to emit;

the impulse-pulse, s(t); and

the amplified time reversed channel impulse response, gh(−

t).

7. A method comprising:

at a base,

emitting an impulse-pulse s(t) in multiple directions;

in response to emitting the impulse-pulse s(t), detecting at a first angular orientation and over a first solid-angle a channel impulse response, h(t), reflected from a remote target, wherein;

the first angular orientation comprises first 3-D angular coordinates, (θ

, φ

), in a coordinate system with an origin at the base;

the channel impulse response, h(t), comprises copies of the impulse-pulse s(t), each copy of the impulse-pulse s(t) provided to the remote target at a different time based on a length of a respective path traveled by the respective copy of the impulse-pulse s(t) through a communication channel between the base and the remote target;

reversing in time domain the channel impulse response h(t);

amplifying the time reversed channel impulse response h(−

t); and

transmitting in the multiple directions the amplified time reversed channel impulse response, Gh(−

t).

8. A system for wireless communications, comprising:

one or more RF base stations, each RF base station being an RF transceiver that wirelessly transmits and receives RF signals; and

one or more RF target stations, each RF target station in wireless communication with the one or more RF base stations,

wherein each RF base station includes a base station receiver, a base station transmitter, an analog-to-digital converter (ADC) and a waveform processor,

wherein the base station receiver includes an antenna to operate in one of a scanning mode and an omnidirectional mode,

wherein the antenna in the scanning mode detects a channel impulse response, h(t), reflected from a RF target station and having copies of an impulse-pulse s(t) emitted by the base station transmitter, each copy of the impulse-pulse s(t) provided to the remote target at a different time based on a length of a respective path traveled by the respective copy of the impulse-pulse s(t) through a communication channel between the RF base station and the RF target station,

wherein the antenna in the omnidirectional mode detects an amplified channel impulse response, Gh(t), based on residual portions of an amplified impulse-pulse Gs(t) reflected from the RF target station and having copies of impulse-pulses s(t) included in a transmitted amplified time reversed channel impulse response, Gh(−

t) provided to the RF target station at the same time;

wherein the ADC is coupled to the antenna to digitize the detected channel impulse response h(t) into a channel impulse response waveform;

wherein the waveform processor is communicatively coupled to the receiver and to reverse in time domain the channel impulse response waveform; and

wherein the base station transmitter is an omnidirectional transmitter communicatively coupled to the waveform processor and emits the impulse-pulse, s(t); and

the amplified time reversed channel impulse response, Gh(−

t).