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US 2012/0257660 A1Published application
Techniques and systems for wireless communications
AssigneeZiva Corporation
InventorsDavid F. Smith, Anis Husain
Life of this patent
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Abstract
Techniques, apparatus and systems for providing radio frequency wireless communications based on time reversal of the channel impulse response of an RF pulse in a transmission channel between an RF transmitter and an RF receiver to enhance reception and detection of an RF pulse at the RF receiver against various effects that can adversely affect and complicate the reception and detection of the RF pulse at the RF receiver.
Claims28
A radio frequency (RF) wireless communication system, comprising:
- a first wireless transceiver at a first location to transmit and receive wireless RF signals, the first wireless transceiver comprising:
- a monitor pulse transmitter to wirelessly transmit periodic monitor RF pulses for monitoring a transmission channel in which a wireless RF signal produced by the first wireless transceiver propagates;
- and
- a signal receiver that receives wireless RF signals for extracting data or information in the received wireless RF signals;
- and
- a second wireless transceiver at a second location separate from the first location to transmit and receive wireless RF signals in wireless communication with the first wireless transceiver, the second wireless transceiver comprising:
- a monitor pulse receiver to receive and detect the monitor RF pulses from the first wireless transceiver;
- a signal transmitter that transmits wireless RF signals comprising RF pulses carrying data or information to be transmitted to the first wireless transceiver;
- and
- a transmission control circuit that processes one or more received monitor RF pulses from the first wireless transceiver to produce a time reversal of an impulse function of the one or more received monitor RF pulses, and multiplexes each RF pulse carrying data or information to be transmitted with the time reversed impulse function as part of each wireless RF signal to be transmitted out by the signal transmitter.
7 more elements
A system for providing radio frequency (RF) communications comprising:
- a target comprising:
- a target-transmitter to repeatedly emit RF impulse-pulses;
- and
- a target-receiver to detect RF data signals;
- a base in communication with the target, the base comprising:
- a base-detector configured to detect a channel impulse response of the RF impulse-pulses emitted by the target, wherein the base-detector comprises an analog-to-digital converter to digitize the detected channel impulse response into a detected channel impulse response waveform;
- a waveform processing unit comprising:
- a temporary memory configured to store the detected channel impulse response waveform;
- a first memory configured to store and reverse in time domain a previously detected channel impulse response waveform;
- a comparator unit to obtain a difference between the channel impulse response waveform in the temporary memory and the channel impulse response waveform in the first memory;
- and
- a switch to replace the channel impulse response waveform stored in the first memory with the channel impulse response waveform stored in the temporary memory, the replacing based on a comparison of the obtained difference against a predefined threshold;
- a multiplexer that adds a copy of the time reversed channel impulse response waveform from the first memory at the beginning of each bit of an RF data stream to produce an output signal;
- and
- a transmitter to emit the output signal.
12 more elements
A method comprising:
- obtaining a channel impulse response for an RF communication system, wherein the obtaining comprises:
- repeatedly emitting from a target impulse-pulses;
- detecting at a base a channel impulse response associated with the emitted impulse-pulses;
- digitizing the detected channel impulse response into a channel impulse response waveform;
- and
- storing the channel impulse response waveform in a temporary memory at the base;
- monitoring the obtained channel impulse response, wherein the monitoring comprises:
- obtaining a difference between a channel impulse response waveform stored in a first memory and the channel impulse response waveform stored in the temporary memory;
- updating the channel impulse response waveform stored in the first memory with the channel impulse response waveform stored in the temporary memory when the obtained difference is greater than a predefined threshold;
- transmitting an RF data stream by using the monitored channel impulse response, wherein the transmitting comprises:
- reversing in time domain the channel impulse response waveform from the first memory;
- preparing a signal for transmission by adding a copy of the time reversed channel impulse response waveform at the beginning of each bit of an RF data stream;
- emitting the prepared signal from the base;
- and
- detecting the RF data stream at the target.
12 more elements
An RF wireless communication method comprising:
- emitting from a target an impulse-pulse;
- detecting at a base a channel impulse response associated with the emitted impulse-pulse;
- digitizing the detected channel impulse response into a channel impulse response waveform;
- storing the channel impulse response waveform in a memory at the base;
- reversing in time domain the channel impulse response waveform from the memory;
- preparing a signal for transmission by adding a copy of the time reversed channel impulse response waveform at the beginning of each bit of an RF data stream;
- emitting the prepared signal from the base;
- detecting the RF data stream at the target;
- and
- emitting from the target another impulse-pulse when a parameter of system performance is less than a first threshold.
7 more elements
Dependencies are inferred from the claim text.