US 11,677,424 B1Granted

Transmit spectrum management for Bluetooth communication and apparatus for management

AssigneeNXP USA, Inc.

InventorVijay Ahirwar

Life of this patent

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Abstract

A method, system, and apparatus for applying dithering to waveforms in a transmitter such as a Bluetooth transmitter. A current waveform corresponding to a current bit of a bitstream is received where the current waveform has a nominal frequency deviation defined by a value of the current bit. Based on the determination that the current waveform and an immediately previous bit of the bitstream are associated with different bit values, a first dithered signal is output which is defined by a first frequency offset pseudorandomly selected from a first set of frequency offsets. A subsequent waveform to the current waveform is received corresponding to a subsequent bit of the bitstream. Based on the subsequent bit and the current bit being associated with bits of the same value, a second dithered signal is output which is defined by a second frequency offset pseudorandomly selected from a second set of frequency offsets.

Claims20

Dependent claims

A method for applying dithering to waveforms in a transmitter, the method comprising:

receiving a current waveform corresponding to a current bit of a bitstream, the current waveform having a first frequency deviation defined by a value of the current bit;
determining that the current bit and an immediately previous bit of the bitstream are associated with different bit values;
based on the determination that the current bit and the previous bit of the bitstream are associated with different bit values, outputting a first dithered waveform which is defined by the first frequency deviation and a first frequency offset pseudorandomly selected from a first set of frequency offsets;
receiving a subsequent waveform to the current waveform corresponding to a subsequent bit of the bitstream;
determining that the subsequent bit and the current bit are associated with bits of a same value;
and
based on the subsequent bit and the current bit being associated with bits of the same value, outputting a second dithered waveform which is defined by the first frequency offset, a second frequency deviation associated with a value of the subsequent bit, and a second frequency offset pseudorandomly selected from a second set of frequency offsets.

4 more elements

Frequency dither circuitry for a wireless transmitter, the frequency dither circuitry configured to:

receive a current waveform corresponding to a current bit of a bitstream, the current waveform having a first frequency deviation defined by a value of the current bit;
determine that the current bit and an immediately previous bit of the bitstream are associated with different bit values;
based on the determination that the current bit and the previous bit are associated with different bit values, output a first dithered waveform which is defined by the first frequency deviation and a first frequency offset pseudorandomly selected from a first set of frequency offsets;
receive a subsequent waveform to the current waveform corresponding to a subsequent bit of the bitstream;
determine that the subsequent bit and current bit are associated with bits of a same value;
and based on the subsequent bit and current bit being associated with bits of the same value, output a second dithered waveform which is defined by the first frequency offset, a second frequency deviation associated with a value of the subsequent bit, and a second frequency offset pseudorandomly selected from a second set of frequency offsets.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/713,056Filed 4 Apr 2022
Granted: 13 Jun 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04B 1/0475
Circuits: with means for limiting noise, interference or distortion
H04L 25/03834
Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties: using pulse shaping
H04L 27/12
Frequency-modulated carrier systems, i.e. using frequency-shift keying: modulator circuits; Transmitter circuits
H04L 27/16
Frequency-modulated carrier systems, i.e. using frequency-shift keying: frequency regulation arrangements