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US 7,065,157 B2Granted
GMSK modulation techniques
AssigneeQUALCOMM Incorporated
InventorHelena Deirdre O'Shea
Life of this patent
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Abstract
This disclosure is directed to digitally implemented GMSK modulation techniques. The digital GMSK modulation techniques make use of a lookup table (LUT) and mapping logic to digitally generate GMSK waveforms. The mapping logic can significantly reduce the size of the LUT, and thereby reduce memory requirements needed for effective digitally implemented GMSK modulation.
Claims32
A method comprising:
- selecting a plurality of first Gaussian minimum shift keying (GMSK) waveforms from a lookup table (LUT) based on a first subset of an input bit stream;
- generating a plurality of control signals based on a second subset of the input bit stream;
- and
- generating a plurality of output GMSK waveforms based on the plurality of first GMSK waveforms and the plurality of control signals.
1 more element
An apparatus comprising:
- a lookup table (LUT) that maps subsets of an input bit stream to Gaussian minimum shift keying (GMSK) waveforms, the LUT outputting a plurality of first GMSK waveforms based on a first subset of the input bit stream;
- and
- mapping logic to generate a plurality of control signals based on a second subset of the input bit stream and to generate a plurality of output GMSK waveforms based on the plurality of first GMSK waveforms and the plurality of control signals.
A wireless communication device comprising:
- a digital Gaussian minimum shift keying (GMSK) modulator including:
- a lookup table (LUT) that maps subsets of an input bit stream to GMSK waveforms, the LUT outputting a plurality of first GMSK waveforms based on a first subset of the input bit stream, and
- mapping logic to generate a plurality of control signals based on a second subset of the input bit stream and to generate a plurality of output GMSK waveforms based on the plurality of first GMSK waveforms and the plurality of control signals;
- a digital-to-analog (D/A) converter to convert the plurality of output GMSK waveforms to an analog signal;
- and
- a transmitter to transmit the analog signal.
3 more elements
An apparatus comprising:
- means for generating a plurality of first Gaussian minimum shift keying (GMSK) waveforms based on a subset of an input bit stream;
- means for generating a plurality of control signals based on a second subset of the input bit stream;
- and
- means for generating a plurality of output GMSK waveforms based on the plurality of first GMSK waveforms and the plurality of control signals.
1 more element
Dependencies are inferred from the claim text.