Transmitter and method for transmitting a bluetooth packet

Patent metadata

Field	Value
Publication number	US-9960939-B1
Application number	US-201715590833-A
Country	US
Kind code	B1
Filing date	May 9, 2017
Priority date	Apr 19, 2017
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Embodiments discloses a transmitter for transmitting a Bluetooth packet in an enhanced data rate format. The Bluetooth packet includes a GFSK modulated segment, a Guard segment and a DPSK modulated segment. The transmitter comprises a first multiplexer configured to select a phase signal from a Guard phase signal, a received GFSK phase signal and a received DPSK phase signal based on time; a second multiplexer configured to select a amplitude signal from a Guard amplitude signal, a received GFSK amplitude signal and a received DPSK amplitude signal based on time, a phase to frequency converter communicatively coupled to the first multiplexer and configured to convert the selected phase signal into converted frequency signal. The transmitter further comprises a phase lock loop, a digital to analog converter and a power amplifier.

First claim

What is claimed is:

1. A transmitter for transmitting a Bluetooth packet in an enhanced data rate format, the Bluetooth packet includes a Gaussian frequency-shift keying (GFSK) modulated segment, a Guard segment and a Differential Phase-Shift Keying (DPSK) modulated segment, the transmitter comprising:
a first multiplexer configured to select a phase signal from a Guard phase signal, a received GFSK phase signal and a received DPSK phase signal based on time;
a second multiplexer configured to select a amplitude signal from a Guard amplitude signal, a received GFSK amplitude signal and a received DPSK amplitude signal based on time,
a phase to frequency converter communicatively coupled to the first multiplexer and configured to convert the selected phase signal into converted frequency signal;
a phase lock loop communicatively coupled to the phase to frequency converter and configured to generate a local oscillation signal based the converted frequency signal;
a digital to analog converter communicatively coupled to the second multiplexer and configured to convert the selected amplitude into an analog selected amplitude; and
a power amplifier communicatively coupled to both the phase lock loop and the digital to analog converter and configured to generate and output a radio frequency signal based on the local oscillation signal and the analog selected amplitude.

2. The transmitter of claim 1 , further comprising
a first frequency to phase converter communicatively coupled to the first multiplexer and configured to convert a frequency of the GFSK modulated segment into the GFSK phase signal.

3. The transmitter of claim 1 , further comprising
a Coordinate Rotation Digital Computer (cordic) communicatively coupled to both the first multiplexer and the second multiplexer and configured to generate the received DPSK phase signal and the received DPSK amplitude signal based on an in-phase branch and a quadrature branch of the DPSK modulated segment.

4. The transmitter of claim 1 , further comprising
a first GFSK amplitude generator communicatively coupled to the second multiplexer and configured to generate the GFSK amplitude signal based on the GFSK modulated segment.

5. The transmitter of claim 1 , further comprising
a Guard phase and amplitude generator configured to generate the Guard phase signal and the Guard amplitude signal based on the Guard segment.

6. The transmitter of claim 5 , wherein the Guard phase and amplitude generator further comprises:
a cordic circuit configured to generate a Guard DPSK phase signal and a Guard DPSK amplitude signal based on an in-phase branch and a quadrature branch of a DPSK modulated Guard signal;
a second frequency to phase converter configured to convert a frequency of a GFSK modulated Guard signal into a phase signal of the GFSK modulated Guard signal;
a second GFSK amplitude generator configured to generate the Guard GFSK amplitude signal;
a ramping up circuit communicatively coupled to the cordic module and configured to generate a ramped up Guard DPSK phase signal and a ramped up Guard DPSK amplitude signal based on the Guard DPSK phase signal and the Guard DPSK amplitude signal;
a ramping down circuit communicatively coupled to the second frequency to phase converter and the second GFSK amplitude generator and configured to generate a ramped down Guard GFSK phase signal and a ramped down Guard GFSK amplitude signal based on the Guard GFSK phase signal and the Guard GFSK amplitude signal;
a first adder communicatively coupled to both the ramping up unit and the ramping down unit and configured to generate and output a Guard amplitude signal by adding the ramped up Guard DPSK amplitude signal and the ramped down Guard GFSK amplitude signal; and
a second adder communicatively coupled to both the ramping up unit and the ramping down unit and configured to generate and output a Guard phase signal by adding the ramped up Guard DPSK phase signal and the ramped down Guard GFSK phase signal.

7. The transmitter of claim 6 , wherein the ramping up circuit and the ramping down circuit are configured to use any of the following window functions to perform the ramping down/up operation: Hamming window, Blackman window, Triangular window or Gaussian window.

8. A method of transmitting a Bluetooth packet in an enhanced data rate format, the Bluetooth packet includes a Gaussian frequency-shift keying (GFSK) modulated segment, a Guard segment and a Differential Phase-Shift Keying (DPSK) modulated segment, the method comprising:
selecting, by a first multiplexer, a phase signal from a Guard phase signal, a received GFSK phase signal and a received DPSK phase signal based on time;
selecting, by a second multiplexer, a amplitude signal from a Guard amplitude signal, a received GFSK amplitude signal and a received DPSK amplitude signal based on time,
converting, by a phase to frequency converter communicatively coupled to the first multiplexer, the selected phase signal into converted frequency signal;
generating, by a phase lock loop communicatively coupled to the phase to frequency converter, a local oscillation signal based the converted frequency signal;
converting, by a digital to analog converter communicatively coupled to the second multiplexer, the selected amplitude into an analog selected amplitude; and
generating and outputting, by a power amplifier communicatively coupled to both the phase lock loop and the digital to analog converter, a radio frequency signal based on the local oscillation signal and the analog selected amplitude.

9. The method of claim 8 , further comprising
converting, by a first frequency to phase converter communicatively coupled to the first multiplexer, a frequency of the GFSK modulated segment into the GFSK phase signal.

10. The method of claim 8 , further comprising
generating, by a Coordinate Rotation Digital Computer (cordic) communicatively coupled to both the first multiplexer and the second multiplexer, the received DPSK phase signal and the received DPSK amplitude signal based on an in-phase branch and a quadrature branch of the DPSK modulated segment.

11. The method of claim 8 , further comprising
generating, by a first GFSK amplitude generator communicatively coupled to the second multiplexer, the GFSK amplitude signal based on the GFSK modulated segment.

12. The method of claim 8 , further comprising
generating, by a Guard phase and amplitude generator, the Guard phase signal and the Guard amplitude signal based on the Guard segment.

13. The method of claim 12 , wherein generating, by a Guard phase and amplitude generator, the Guard phase signal and the Guard amplitude signal based on the Guard segment is further implemented by:
generating, by a cordic module, a Guard DPSK phase signal and a Guard DPSK amplitude signal based on an in-phase branch and a quadrature branch of a DPSK modulated Guard signal;
converting, by a second frequency to phase converter, a frequency of a GFSK modulated Guard signal into a phase signal of the GFSK modulated Guard signal;
generating, by a second GFSK amplitude generator, the Guard GFSK amplitude signal;
generating, by a ramping up unit communicatively coupled to the cordic module, a ramped up Guard DPSK phase signal and a ramped up Guard DPSK amplitude signal based on the Guard DPSK phase signal and the Guard DPSK amplitude signal;
generating, by a ramping down unit communicatively coupled to the second frequency to phase converter and the second GFSK amplitude generator, a ramped down Guard GFSK phase signal and a ramped down Guard GFSK amplitude signal based on the Guard GFSK phase signal and the Guard GFSK ampli

Assignees

• Beken Corp

Inventors

• Huang Yiming
• Wang Weifeng

Classifications

• H04L27/12 Primary

  Modulator circuits; Transmitter circuits · CPC title

• H04L7/0331

  with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock (H04L7/0337 takes precedence) · CPC title

• H04B2001/0408

  with power amplifiers · CPC title

• H04L27/2017

  in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation (H04L27/201 takes precedence) · CPC title

• H03C5/00

  Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal (H03C7/00 takes precedence) · CPC title