Back to results
US 2015/0312081 A1Published application
Quadrature amplitude modulation for time-reversal systems
AssigneeOrigin Wireless, Inc.
InventorsYu-Han Yang, Yan Chen, K. J. Ray Liu
Life of this patent
Estimating the term…
Abstract
Time-reversal wireless communication includes: at a base station, receiving a probe signal from a terminal device; generating a signature waveform that is based on a time-reversed signal of a channel response signal derived from the probe signal; performing quadrature amplitude modulation (QAM) on a transmit signal to generate a quadrature amplitude modulated signal; and generating a transmission signal based on the quadrature amplitude modulated signal and the signature waveform.
Claims32
A method comprising:
- at a base station, receiving a probe signal from a terminal device;
- generating a signature waveform that is based on a channel response signal derived from the probe signal;
- performing quadrature amplitude modulation (QAM) on a transmit signal to generate a quadrature amplitude modulated signal;
- and
- generating a transmission signal based on the quadrature amplitude modulated signal and the signature waveform.
2 more elements
A method comprising:
- performing quadrature amplitude modulation on a first transmit signal to generate a first quadrature amplitude modulated signal;
- performing quadrature amplitude modulation on a second transmit signal to generate a second quadrature amplitude modulated signal;
- generating a first transmission signal based on the first quadrature amplitude modulated signal and a first signature waveform associated with a first terminal device;
- generating a second transmission signal based on the second quadrature amplitude modulated signal and a second signature waveform associated with a second terminal device;
- and
- generating a combined transmission signal by adding a real part of the first transmission signal with a real part of the second transmission signal to generate an in-phase part of the combined transmission signal, and adding an imaginary part of the first transmission signal with an imaginary part of the second transmission signal to generate a quadrature part of the combined transmission signal.
3 more elements
An apparatus comprising:
- a first device comprising:
- an input circuit configured to receive a probe signal transmitted wirelessly from a second device through multiple propagation paths;
- and
- a data processor configured to:
- generate a signature waveform that is based on a channel response signal derived from the probe signal;
- perform quadrature amplitude modulation (QAM) on a transmit signal to generate a quadrature amplitude modulated signal;
- and
- generate a transmission signal based on the quadrature amplitude modulated signal and the signature waveform.
5 more elements
31-51. (canceled)
Dependencies are inferred from the claim text.