Phase noise extraction apparatus and technique
AssigneeAgilent Technologies, Inc.
InventorsKoji Harada, Mitsuru Yokoyama
Life of this patent
Estimating the term…
Abstract
A phase noise extraction apparatus and technique that extracts phase noise induced by a component of a transmitter from a radio frequency (RF) signal and attenuates noise induced from other sources. The RF signal is digitized, modulation is removed, and the carrier is suppressed to provide a noise signal including the phase noise and the noise induced from the other sources. A complementary autocorrelation operation is applied to the noise signal to attenuate the noise from the other sources. The correlated signal is transformed into the frequency domain to generate a power spectrum of the phase noise that may be measured or displayed.
Claims23
A method comprising:
- digitizing a radio frequency (RF) signal that includes phase noise and secondary noise;
- removing modulation and suppressing a carrier represented in the digitized signal to provide a composite noise signal including the phase noise and the secondary noise;
- applying a complementary autocorrelation on the composite noise signal to attenuate the secondary noise and provide a correlated noise signal substantially without the secondary noise;
- and
- representing a power spectrum of the phase noise responsive to the correlated noise signal.
An apparatus comprising:
- a converter configured to digitize a radio frequency (RF) signal that includes phase noise and secondary noise;
- a processing unit configured to remove modulation and suppress a carrier represented in the digitized signal to provide a composite noise signal including the phase noise and the secondary noise;
- a correlator configured to apply a complementary autocorrelation on the composite noise signal to attenuate the secondary noise and provide a correlated noise signal substantially without the secondary noise;
- and
- a generator configured to represent a power spectrum of the phase noise responsive to the correlated noise signal.
A non-transitory computer readable medium that stores a program executable by a computer for extracting phase noise from a radio frequency (RF) signal, the computer readable medium comprising:
- a first code segment for digitizing the RF signal that includes the phase noise and secondary noise;
- a second code segment for removing modulation and suppressing a carrier represented in the digitized signal to provide a composite noise signal including the phase noise and the secondary noise;
- a third code segment for applying a complementary autocorrelation on the composite noise signal to attenuate the secondary noise and provide a correlation noise signal substantially without the secondary noise;
- and
- a fourth code segment for representing a power spectrum of the phase noise responsive to the correlated noise signal.
An apparatus comprising:
- a converter configured to digitize a first radio frequency (RF) signal and a second RF signal that both include phase noise and secondary noise;
- a processing unit configured to remove modulation and suppress carriers represented in the first and second digitized signals to respectively provide a first composite noise signal and a second composite noise signal both including the phase noise and the secondary noise;
- a correlator configured to apply a complementary cross-correlation on the first and second composite noise signals to attenuate the secondary noise, and provide a correlated noise signal substantially without the secondary noise;
- and
- a generator configured to represent a power spectrum of the phase noise responsive to the correlated noise signal.
A method comprising:
- digitizing a radio frequency (RF) signal that includes amplitude noise and secondary noise;
- removing modulation and suppressing a carrier represented in the digitized signal to provide a composite noise signal including the amplitude noise and the secondary noise;
- applying a complementary autocorrelation on the composite noise signal to attenuate the secondary noise and provide a correlated noise signal substantially without the secondary noise;
- and
- representing a power spectrum of the amplitude noise responsive to the correlated noise signal.
Dependencies are inferred from the claim text.