Signal receiving apparatus and signal receiving method, signal generating apparatus and signal generating method

Patent metadata

Field	Value
Publication number	US-10404292-B2
Application number	US-201715856821-A
Country	US
Kind code	B2
Filing date	Dec 28, 2017
Priority date	Dec 28, 2017
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

Techniques related to signal processing include setting up a first operation mode or a second operation mode. In the first operation mode: providing a first analog signal to a first A/D converter by a first switch and a second analog signal to a second A/D by second switch, and converting the first analog signal to a first digital signal by the first A/D and the second analog signal to a second digital signal by the second A/D. In the second operation mode: demodulating a third analog signal to an in-phase signal and a quadrature signal by an I-Q-demodulator, providing the in-phase signal to the first A/D by the first switch, providing the quadrature signal to a second A/D by second switch, converting the in-phase signal to a third digital signal by the first A/D, and converting the quadrature signal to a fourth digital signal by the second A/D.

First claim

The invention claimed is:

1. A signal receiving apparatus, comprising:
a first signal input terminal for receiving a first analogue signal;
a second signal input terminal for receiving a second analogue signal;
a third signal input terminal for receiving a third analogue signal;
a first analogue to digital converter having an analogue input port and a digital output port, the first analogue to digital converter is adapted to convert an analogue signal received at the analogue input port to a digital signal and provide the digital signal to the digital output port;
a second analogue to digital converter having an analogue input port and a digital output port, the second analogue to digital converter is adapted to convert an analogue signal received at the analogue input port to a digital signal and provide the digital signal to the digital output port;
an I-Q-demodulator having an input port, an in-phase output port and an quadrature output port, the I-Q-demodulator is adapted to demodulate a signal received at the input port of the I-Q-demodulator to an in-phase signal and a quadrature signal, and provide the in-phase signal to the in-phase output port and the quadrature signal to the quadrature output port;
a first switch comprising a first input port, a second input port and an output port, wherein the first input port of the first switch is electrically connected to the first signal input port, and the second input port of the first switch is electrically connected to the in-phase-output port of the I-Q-demodulator, and the output port of the first switch is electrically connected to the analogue input port of the first analogue to digital converter; and
a second switch comprising a first input port, a second input port and an output port, wherein the first input port of the second switch is electrically connected to the second signal input port, and the second input port of the second switch is electrically connected to the quadrature-output port of the I-Q-demodulator, and the output port of the second switch is electrically connected to the analogue input port of the second analogue to digital converter;
wherein in a first operation mode of the signal receiving apparatus, the first switch is adapted to electrically connect the first input port of the first switch to the output port of the first switch, and the second switch is adapted to electrically connect the first input port of the second switch to the output port of the second switch, and
wherein in a second operation mode of the signal receiving apparatus, the first switch is adapted to electrically connect the second input port of the first switch to the output port of the first switch, and the second switch is adapted to electrically connect the second input port of the second switch to the output port of the second switch.

2. The signal receiving apparatus according to claim 1 , comprising a signal processor for processing the digital output of the first analogue to digital converter and the digital output of the second analogue to digital converter separately in the first operation mode of the signal receiving apparatus and for combining the digital output of the first analogue to digital converter and the digital output of the second analogue to digital converter in the second operation mode of the signal receiving apparatus.

3. The signal receiving apparatus according to claim 1 , wherein a same sampling rate is applied to the first analogue to digital converter and the second analogue to digital converter in the second operation mode of the signal receiving apparatus, and wherein the sampling of the first of the digital converter and the second analogue to digital converter are synchronized with each other.

4. The signal receiving apparatus according to claim 1 , comprising a local oscillator for providing a local frequency to the I-Q-demodulator, wherein the I-Q-demodulator is adapted to demodulate the signal received at the input port of the I-Q-demodulator based on the provided local frequency.

5. The signal receiving apparatus according to claim 1 , comprising a first frequency mixer for mixing a first radio frequency signal at a first local frequency and outputting the mixed signal to the first signal input terminal; and
a second frequency mixer for mixing a second radio frequency signal at a second local frequency and outputting the mixed signal to the second signal input terminal.

6. A signal receiving method, comprising the steps of:
setting up a first operation mode or a second operation mode;
providing a first analogue signal to a first analogue to digital converter by a first switch in the first operation mode;
providing a second analogue signal to a second analogue to digital converter by second switch in the first operation mode;
converting the first analogue signal to a first digital signal by the first analogue to digital converter in the first operation mode; and
converting the second analogue signal to a second digital signal by the second analogue to digital converter in the first operation mode; or
demodulating a third analogue signal to an in-phase signal and a quadrature signal by an I-Q-demodulator in the second operation mode;
providing the in-phase signal to the first analogue to digital converter by the first switch in the second operation mode;
providing the quadrature signal to a second analogue to digital converter by second switch in the second operation mode;
converting the in-phase signal to a third digital signal by the first analogue to digital converter in the second operation mode; and
converting the quadrature signal to a fourth digital signal by the second analogue to digital converter in the second operation mode.

7. The signal receiving method according to claim 6 , comprising the steps of:
processing the first digital signal and the second digital signal separately by a signal processor in the first operation mode; or
combining the third digital signal and the fourth digital signal by the signal processor in the second operation mode.

8. The signal receiving method according to claim 6 , where a same sampling rate is applied for converting the in-phase signal and the quadrature signal in the second operation mode, and wherein the first analogue to digital converter and the second analogue to digital converter are synchronized with each other.

9. The signal receiving method according to claim 6 , comprising the step of providing a local frequency to the I-Q-demodulator, wherein the in-phase signal and the quadrature signal are provided based on the provided local frequency.

10. The signal receiving method according to claim 6 , comprising the steps of:
mixing a first radio frequency signal with the first local frequency to obtain the first analogue signal in the first operation mode; and
mixing a second radio frequency signal with a second local frequency to obtain the second analogue signal in the first operation mode.

11. A signal generating apparatus, comprising:
a first signal output terminal;
a second signal output terminal;
a third signal output terminal;
a first digital to analogue converter having a first digital input port and an analogue output port, the first digital to analogue converter is adapted to convert a digital signal received at the digital input port of the first digital to analogue converter to a first analogue signal and provide the first analogue signal to the analogue output port of the first digital to analogue converter;
a second digital to analogue converter having a digital input port and an analogue output port, the second digital to analogue converter is adapted to convert a digital signal received at the digital input port of th

Assignees

• Rohde & Schwarz

Inventors

• Holzmann Gottfried
• Roth Martin
• Oetjen Martin

Classifications

• H04B1/0014

  using DSP [Digital Signal Processor] quadrature modulation and demodulation · CPC title

• H03D2200/0082

  Quadrature arrangements · CPC title

• H03D3/007

  by converting the oscillations into two quadrature related signals (H03D3/245 takes precedence) · CPC title

• H04B1/0032 Primary

  with analogue quadrature frequency conversion to and from the baseband (quadrature modulators and demodulators per se H03D3/007, H03C3/40) · CPC title

• H03D1/22

  Homodyne or synchrodyne circuits {(receiver circuits H04B1/30)} · CPC title