Wireless communication device, integrated circuitry, and wireless communication method

Patent metadata

Field	Value
Publication number	US-2016173303-A1
Application number	US-201615048297-A
Country	US
Kind code	A1
Filing date	Feb 19, 2016
Priority date	Aug 23, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A wireless communication device has an analog control loop circuitry that generates an analog control signal to adjust a phase of a voltage controlled oscillation signal, in accordance with a phase of a reception signal, a digital control loop circuitry that generates a digital control signal having a frequency determined by a frequency of a reference signal and a predetermined frequency setting code signal and having a phase opposite to a phase of the analog control signal, a voltage controlled oscillator that generates the voltage controlled oscillation signal, on the basis of the analog control signal and the digital control signal, and a data slicer that generates a digital signal obtained by digital demodulation of the reception signal, on the basis of a comparison result of the digital control signal and a predetermined threshold value.

First claim

1 . A wireless communication device comprising:
an analog control loop circuitry that generates an analog control signal to adjust a phase of a voltage controlled oscillation signal, in accordance with a phase of a reception signal; a digital control loop circuitry that generates a digital control signal having a frequency determined by a frequency of a reference signal and a predetermined frequency setting code signal and having a phase opposite to a phase of the analog control signal; a voltage controlled oscillator that generates the voltage controlled oscillation signal, on the basis of the analog control signal and the digital control signal; and a data slicer that generates a digital signal obtained by digital demodulation of the reception signal, on the basis of a comparison result of the digital control signal and a predetermined threshold value, wherein gain of the digital control loop circuitry is higher than gain of the analog control loop circuitry.

2 . The wireless communication device according to claim 1 ,
wherein the analog control loop circuitry comprises a frequency converter that generates a phase difference signal of the reception signal and the voltage controlled oscillation signal and a low-pass filter that restricts a band of an output signal of the frequency converter and generates the analog control signal, and the digital control loop circuitry has a phase-digital converter that detects a phase of the voltage controlled oscillation signal in synchronization with the reference signal, a digital differentiator that performs differentiation processing on an output signal of the phase-digital converter and converts the output signal into frequency information, a digital subtracter that detects a difference of an output signal of the digital differentiator and the frequency setting code signal and generates a frequency error signal, and a loop gain controller that generates the digital control signal, on the basis of an output signal of the digital subtracter.

3 . The wireless communication device according to claim 2 , further comprising:
a first filter that smooths an output signal of the loop gain controller and generates the digital control signal; and a second filter that supplies a signal obtained by removing an interfering wave component included in an output signal of the first filter to the data slicer, wherein the data slicer generates the digital signal, on the basis of a comparison result of an output signal of the second filter and the predetermined threshold value.

4 . The wireless communication device according to claim 2 , further comprising:
a frequency offset cancellation circuitry that corrects the frequency setting code signal to eliminate an error of a frequency of the reception signal and a frequency of the voltage controlled oscillation signal.

5 . The wireless communication device according to claim 4 ,
wherein the reception signal includes a preamble portion including a non-modulated carrier signal and a modulation portion obtained by modulating data in the carrier signal, for each symbol, and the frequency offset cancellation circuitry corrects the frequency setting code signal on the basis of the preamble portion of the reception signal, for each symbol.

6 . The wireless communication device according to claim 4 , further comprising:
a first high-speed settling gain controller that adjusts the digital control signal output from the loop gain controller, on the basis of a correction signal that corrects the frequency setting code signal by the frequency offset cancellation circuitry, wherein the digital control signal corrected by the first high-speed settling gain controller is input to the voltage controlled oscillator.

7 . The wireless communication device according to claim 2 ,
wherein the reception signal is a frequency-shift keying (FSK) signal, and the wireless communication device further includes a phase shift circuitry that adjusts a phase of an output signal of the digital subtracter, on the basis of the digital signal generated by the data slicer, such that a phase of the digital control signal changes in a monotonic increase direction or a monotonic decrease direction for each symbol.

8 . The wireless communication device according to claim 7 , further comprising:
a second high-speed settling gain controller that adjusts the digital control signal output from the loop gain controller, on the basis of a phase adjustment signal to adjust the phase of the output signal of the digital subtracter by the phase shift circuitry.

9 . The wireless communication device according to claim 2 , further comprising:
a phase offset cancellation circuitry that adjusts a phase of the digital control signal, in accordance with timing when the analog control signal becomes equal to an intermediate value of a maximum amplitude value and a minimum amplitude value, when a frequency of the analog control signal and a frequency of the digital control signal are matched with each other.

10 . The wireless communication device according to claim 9 , further comprising:
a third high-speed setting gain controller that adjusts the digital control signal output from the loop gain controller, on the basis of a phase adjustment signal that adjusts the phase of the digital control signal by the phase offset cancellation circuitry.

11 . The wireless communication device according to claim 9 ,
wherein the reception signal is a frequency-shift keying (FSK) signal that includes a preamble portion including a non-modulated carrier signal and a modulation portion obtained by modulating data in the carrier signal, for each symbol, and the phase offset cancellation circuitry adjusts the phase of the digital control signal using the carrier signal in the preamble portion.

12 . A wireless communication device comprising:
an RF circuitry; and a baseband circuitry, wherein the RF circuitry has a transmission circuitry and a reception circuitry, the baseband circuitry has a transmission processing circuitry and a reception processing circuitry, the reception circuitry has an analog control loop circuitry that generates an analog control signal to adjust a phase of a voltage controlled oscillation signal, in accordance with a phase of a reception signal, a digital control loop circuitry that generates a digital control signal having a frequency determined by a frequency of a reference signal and a predetermined frequency setting code signal and having a phase opposite to a phase of the analog control signal, and a voltage controlled oscillator that generates the voltage controlled oscillation signal, on the basis of the analog control signal and the digital control signal, the reception processing circuitry has a data slicer that generates a digital signal obtained by performing digital demodulation on the reception signal, on the basis of a comparison result of the digital control signal and a predetermined threshold value, and gain of the digital control loop circuitry is higher than gain of the analog control loop circuitry.

13 . An integrated circuitry comprising the wireless communication device according to claim 1 .

14 . A wireless communication device comprising:
the integrated circuitry according to claim 13 ; and at least one antenna.

15 . A wireless communication method comprising:
generating an analog control signal that adjusts a phase of a voltage controlled oscillation signal, in accordance with a phase of a reception signal, using an analog control loop circuitry; generating a digital control signal having a frequency determined by

Assignees

• Toshiba Kk

Inventors

• Sai Akihide
• Furuta Masanori
• Itakura Tetsuro

Classifications

• H04L27/32

  Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26 · CPC title

• H04L27/16 Primary

  Frequency regulation arrangements · CPC title

• H04L27/227

  using coherent demodulation · CPC title