Communications device and method for operating a communications device

Patent metadata

Field	Value
Publication number	US-11206170-B2
Application number	US-201916704262-A
Country	US
Kind code	B2
Filing date	Dec 5, 2019
Priority date	Dec 19, 2018
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

Embodiments of communications devices and methods for operating a communications device are described. In an embodiment, a communications device includes a complex multiplier configured to multiply a first input complex signal with a second input complex signal to generate an output complex signal, an amplifier configured to amplify an imaginary part of the output complex signal to generate an amplification result, a delay element configured to delay a rotation angle signal that is related to the second input complex signal, and a subtractor configured to subtract the amplification result from the delayed rotation angle signal to generate the rotation angle signal. Other embodiments are also described.

First claim

The invention claimed is:

1. A communications device, the communications device comprising:
a complex multiplier configured to multiply a first input complex signal with a second input complex signal to generate an output complex signal;
an amplifier configured to amplify an imaginary part of the output complex signal to generate an amplification result;
a delay element configured to delay a rotation angle signal that is related to the second input complex signal; and
a subtractor configured to subtract the amplification result from the delayed rotation angle signal to generate the rotation angle signal.

2. The communications device of claim 1 , wherein the first input complex signal comprises a real part that is a baseband in-phase (I) component and an imaginary part that is a baseband quadrature (Q) component.

3. The communications device of claim 2 , further comprising a baseband IQ demodulator configured to generate the baseband in-phase (I) and quadrature (Q) components based on a radio frequency (RF) input signal.

4. The communications device of claim 3 , wherein the baseband IQ demodulator comprises a clock source configured to generate a clock signal, and wherein the baseband IQ demodulator is configured to generate the baseband in-phase (I) and quadrature (Q) components based on the RF input signal and the clock signal.

5. The communications device of claim 1 , wherein the second input complex signal is represented as:
cos( phi ( j ))+1 i *sin( phi ( j )),

where phi is the rotation angle signal, and where j is complex unit.

6. The communications device of claim 1 , wherein the complex multiplier is configured to output a real part of the output complex signal for decoding.

7. The communications device of claim 1 , further comprising a decoder configured to decode a real part of the output complex signal.

8. The communications device of claim 1 , wherein the amplifier is configured to amplify the imaginary part of the output complex signal by an amplification gain.

9. A method for operating a communications device, the method comprising:
multiplying a first input complex signal with a second input complex signal to generate an output complex signal;
amplifying an imaginary part of the output complex signal to generate an amplification result;
delaying a rotation angle signal that is related to the second input complex signal; and
subtracting the amplification result from the delayed rotation angle signal to generate the rotation angle signal.

10. The method of claim 9 , wherein the first input complex signal comprises a real part that is a baseband in-phase (I) component and an imaginary part that is a baseband quadrature (Q) component.

11. The method of claim 10 , further comprising generating the baseband in-phase (I) and quadrature (Q) components based on a radio frequency (RF) input signal.

12. The method of claim 11 , further comprising obtaining a clock signal, wherein generating the baseband in-phase (I) and quadrature (Q) components based on the RF input signal comprises generating the baseband in-phase (I) and quadrature (Q) components based on the RF input signal and the clock signal.

13. The method of claim 9 , wherein the second input complex signal is represented as:
cos( phi ( j ))+1 i *sin( phi ( j )),

where phi is the rotation angle signal, and where j is complex unit.

14. The method of claim 9 , further comprising outputting a real part of the output complex signal for decoding.

15. The method of claim 9 , further comprising decoding a real part of the output complex signal.

Assignees

• Nxp Bv

Inventors

• Muehlmann Ulrich Andreas
• Mendel Stefan
• Charpentier Steve

Classifications

• H04B1/10

  Means associated with receiver for limiting or suppressing noise or interference · CPC title

• H03D7/165

  at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature (combined with amplitude demodulation H03D1/2245, combined with angle demodulation H03D3/007; N-path filters H03H19/002) · CPC title

• H04L27/362 Primary

  Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated (H04L27/366 takes precedence) · CPC title

• H04L27/38

  Demodulator circuits; Receiver circuits · CPC title

• H03D7/14

  Balanced arrangements · CPC title