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US 2003/0112862 A1Published application
Method and apparatus to generate ON-OFF keying signals suitable for communications
AssigneeNational University of Singapore
InventorsJurianto Joe, Chwee Mei Wong
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Abstract
A method and apparatus to generate an OOK-type of signal for transmitting digital data without having to use conventional mixer and oscillator circuitry as the carrier source is disclosed. The method utilizes a circuit that has a transfer characteristic comprising alternating unstable and stable operating regions, which produce respectively non-oscillatory and oscillatory output. The circuit is further characterized by having an operating point that can drive the circuit into stable or unstable operation based on the digital data. The resulting output signal is an OOK-type of signal suitable for transmission.
Claims28
A method for generating a transmission signal suitable for transmitting a digital signal comprising:
- receiving said data signal;
- controlling a non-linear signal generating circuit with a control signal based on said digital signal, said non-linear signal generating circuit producing an oscillatory signal component when said control signal is at a first signal amplitude and a non-oscillatory signal component when said control signal is at a second signal amplitude, said transmission signal comprising one or more of said oscillatory and non-oscillatory signal components.
A method for generating a transmission signal suitable for transmitting a digital signal comprising:
- receiving said data signal;
- producing a pulse code modulated signal based on said data signal;
- and
- applying said pulse code modulated signal to a signal generating circuit to produce a transmittable signal;
- said signal generating circuit characterized by a transfer function having an unstable operating region portion bounded one each side by a stable operating region portion,
- said signal generating circuit having an operating point that lies on a location on said transfer function, said location being dependent on said pulse code modulated signal, wherein said signal generating circuit produces an oscillatory signal when said operating point is located in said unstable region and wherein said signal generating circuit produces a non-oscillatory signal when said operating point is located in one of said stable operating regions,
- said operating point being located in said unstable operating region when said pulse code modulated signal is at a first amplitude, thereby producing an oscillatory signal component in said transmittable signal,
- said operating point being located in one of said stable operating regions when said pulse code modulated signal is at a second amplitude, thereby producing a non-oscillatory signal component in said transmittable signal.
5 more elements
A method for transmitting a digital data stream comprising:
- receiving the digital data stream as a data signal comprising signal portions having a first signal amplitude and signal portions have a second signal amplitude;
- applying said digital signal to a signal generating circuit to produce a transmission signal;
- and
- transmitting said transmission signal,
- said signal generating circuit characterized by a transfer function having an unstable operating region portion bounded one each side by a stable operating region portion,
- said signal generating circuit having an operating point that lies on a location on said transfer function, said location being determined based on said digital signal, wherein said signal generating circuit produces an oscillatory signal when said operating point is located in said unstable region and wherein said signal generating circuit produces a non-oscillatory signal when said operating point is located in one of said stable operating regions,
- said operating point being located in said unstable operating region when said digital signal is at said first signal amplitude, thereby producing an oscillatory signal component in said transmittable signal,
- said operating point being located in one of said stable operating regions when said digital signal is at said second signal amplitude, thereby producing a non-oscillatory signal component in said transmission signal.
5 more elements
A transmission device for transmitting digital information comprising:
- pulse code modulator having an input to receive a digital data stream and operable to generate a pulse code modulated signal representative of said digital data stream;
- and
- a signal generating circuit coupled to receive said pulse code modulated signal, said signal generating circuit operable to generate a transmission signal in response to said pulse code modulated signal, said signal generating circuit producing an oscillatory signal when said pulse code modulated signal is at a first signal amplitude and producing a non-oscillatory signal when said pulse code modulated signal is at a second signal amplitude.
A transmission device for transmitting digital data comprising:
- a signal generating circuit having an input for receiving a digital data signal, said digital data signal comprising signal portions of a first signal amplitude and signal portions of a second signal amplitude, said signal generating circuit producing a transmission signal having oscillatory signal portions and stead state signal portions;
- and
- an antenna component coupled to receive said transmission signal and configured to radiate said transmission signal as a transmitted signal,
- said signal generating circuit characterized by a transfer function having an unstable operating region portion bounded one each side by a stable operating region portion,
- said signal generating circuit producing an oscillatory signal when said digital data signal is at said first signal amplitude, said signal generating circuit producing a non-oscillatory signal when said digital data signal is at said second signal amplitude.
2 more elements
A digital data transmission device comprising:
- means for receiving a digital data stream and producing a digital signal representative of said digital data stream;
- and
- circuit means for generating a transmission signal in response to said digital signal, said transmission signal producing an oscillatory signal when said digital signal is at a first signal amplitude and producing a non-oscillatory signal when said digital signal is at a second signal amplitude,
- said circuit means having a transfer function characterized by having alternating stable and unstable operating regions, wherein oscillatory signals are produced when said circuit means is operating in an unstable operating region and non-oscillatory signals are produced when said circuit means is operating in a stable operating region,
- said circuit means operating in a stable region when said digital signal is at said first signal amplitude,
- said circuit means operating in an unstable regions when said digital signal is at said second signal amplitude.
3 more elements
Dependencies are inferred from the claim text.