Phasor IQ demodulation
OwnerPaul David Swansoninventor
Life of this patent
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Abstract
A method for demodulating an RF signal to polar in-phase and quadrature (IQ) components that includes converting an RF signal with an analog-to-digital converter and calculating the polar in-phase and quadrature (IQ) components of the RF signal as an IQ phasor phase angle and an IQ amplitude using a digital processor. The analog-to-digital converter uses a sampling rate, where, when the sampling rate used has sampling rates other than 3 times an RF carrier frequency of the RF signal, a digital logic circuit splines data to the sampling rate of 3 times the RF carrier frequency of the RF signal. The digital processor calculates the polar in-phase and quadrature (IQ) components of the RF signal as an IQ phasor phase angle and an IQ amplitude using addition, subtraction, multiplication, division, and absolute value.
Claims17
A method for demodulating an RF signal to polar in-phase and quadrature (IQ) components, comprising:
- receiving an RF signal with an analog-to-digital converter and converting the RF signal with a sampling rate of 3 times an RF carrier frequency of the RF signal, thereby obtaining 3 adjacent samples per carrier frequency period of the RF signal;
- and
- calculating the polar in-phase and quadrature (IQ) components of the RF signal as an IQ phasor phase angle and an IQ amplitude using the 3 adjacent samples per frequency period of the RF signal and a digital processor, wherein the IQ phasor phase angle and the IQ amplitude are calculated using addition, subtraction, multiplication, division and absolute value.
A method for demodulating an RF signal to polar in-phase and quadrature (IQ) components, comprising:
- receiving an RF signal with an analog-to-digital converter and converting the RF signal with a sampling rate of 3 times an RF carrier frequency of the RF signal, thereby obtaining 3 adjacent samples per carrier frequency period of the RF signal;
- using a shaped bandpass filter wherein, for each adjacent sample per carrier frequency period of the RF signal, the shaped bandpass filter calculates a mean value of i) the adjacent sample per carrier frequency period of the RF signal, ii) a negative of a sum of a previous adjacent sample per carrier frequency period of the RF signal and an upcoming adjacent sample per carrier frequency period of the RF signal, iii) a negative value of a sum of two previous adjacent samples per carrier frequency period of the RF signal, and iv) a negative of a sum of two upcoming adjacent samples per carrier frequency period of the RF signal, and wherein the shaped band pass filter iteratively filters one or more times;
- and
- calculating the polar in-phase and quadrature (IQ) components of the RF signal as an IQ phasor phase angle and an IQ amplitude using the 3 adjacent samples per frequency period of the RF signal and a digital processor after the shaped bandpass filter, wherein the IQ phasor phase angle and the IQ amplitude are calculated using addition, subtraction, multiplication, division and absolute value.
A system for demodulating an RF signal to polar in-phase and quadrature (IQ) components, comprising:
- an analog-to-digital converter, wherein the analog-to-digital converter receives an RF signal and converts the RF signal using a sampling rate of 3 times the RF carrier frequency of the RF signal, thereby obtaining 3 adjacent samples per carrier frequency period of the RF signal;
- a digital processor electronically connected to an analog-to-digital converter, wherein the analog-to-digital converter provides the 3 adjacent samples per carrier frequency period of the RF signal via an electrical connection to the digital processor that calculates the polar in-phase and quadrature (IQ) components of the RF signal using the 3 adjacent samples per carrier frequency period of the RF signal as an IQ phasor phase angle and an IQ amplitude using addition, subtraction, multiplication, division, and absolute value.
A method for demodulating an RF signal to polar in-phase and quadrature (IQ) components, comprising:
- receiving an RF signal with an analog-to-digital converter and converting the RF signal to data using a sampling rate that is not 3 times an RF carrier frequency of the RF signal;
- splining the data with a digital logic circuit to a sampling rate of 3 times the RF carrier frequency of the RF signal, thereby obtaining 3 adjacent samples per carrier frequency period of the RF signal;
- and
- calculating the polar in-phase and quadrature (IQ) components of the RF signal as an IQ phasor phase angle and an IQ amplitude using the 3 adjacent samples per carrier frequency period of the RF signal and a digital processor, wherein the IQ phasor phase angle and the IQ amplitude are calculated using addition, subtraction, multiplication, division, and absolute value.
Dependencies are inferred from the claim text.