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US 2006/0222102 A1Published application
Wireless communication system
AssigneeTeradyne, Inc.
InventorToshihide Kadota
Life of this patent
Estimating the term…
Abstract
Methods and systems for modulating a signal are described. A phase-modulated signal that includes a sequence of contiguous one-cycle sinusoidal waveforms having a frequency above 50 MHz is generated. The phases of the one-cycle sinusoidal waveforms correspond to symbols of a message signal. A bandwidth of the phase-modulated signal is reduced using a bandpass filter centered at the frequency of the contiguous one-cycle sinusoidal waveforms. The phase-modulated signal is wirelessly transmitted.
Claims20
A method comprising:
- generating a phase-modulated signal comprising a sequence of contiguous one-cycle sinusoidal waveforms having a frequency above 50 MHz wherein phases of the one-cycle sinusoidal waveforms correspond to symbols of a message signal;
- reducing a bandwidth of the phase-modulated signal using a bandpass filter centered at the frequency of the contiguous one-cycle sinusoidal waveforms;
- and
- wirelessly transmitting the phase-modulated signal.
1 more element
A method comprising:
- generating a phase-modulated signal comprising a sequence of contiguous one-cycle sinusoidal waveforms having a frequency below a predetermined value wherein phases of the contiguous one-cycle sinusoidal waveforms correspond to symbols of a message signal;
- mixing the phase-modulated signal with a sinusoidal carrier having a frequency greater than the predetermined value to produce a radio-frequency modulated signal;
- reducing the bandwidth of the radio-frequency modulated signal using a bandpass filter centered at the frequency of the sinusoidal carrier;
- and
- wirelessly transmitting the radio-frequency modulated signal.
2 more elements
A system comprising:
- a programmable direct digital synthesizer configured to generate a phase-modulated signal comprising a sequence of contiguous one-cycle sinusoidal waveforms having a frequency above 50 MHz wherein phases of the contiguous one-cycle sinusoidal waveforms correspond to symbols of a message signal;
- a bandpass filter centered at the frequency of the contiguous one-cycle sinusoidal waveforms, the bandpass filter configured to reduce the bandwidth of the phase-modulated signal;
- and
- an antenna for wirelessly transmitting the phase-modulated signal.
1 more element
A system comprising:
- a programmable direct digital synthesizer configured to generate a phase-modulated signal comprising a sequence of contiguous one-cycle sinusoidal waveforms having a frequency below a predetermined value wherein phases of the contiguous one-cycle sinusoidal waveforms correspond to symbols of a message signal;
- a mixer configured to mix the phase-modulated signal with a sinusoidal carrier having a frequency greater than the predetermined value to produce a radio-frequency modulated signal;
- a bandpass filter centered at the frequency of the contiguous one-cycle sinusoidal waveforms, the bandpass filter configured to reduce the bandwidth of the radio-frequency modulated signal;
- and
- an antenna for wirelessly transmitting the phase-modulated signal to a receiver.
2 more elements
Dependencies are inferred from the claim text.