Transmitter and a method for transmitting data
DCFirst Claim
1. A method for transmitting data from a first antenna, said method including the steps of:
- providing a carrier signal;
imposing a phase modulation of less than 90°
on the carrier signal in accordance with a data signal to create a modulated signal having a carrier frequency and sidebands, the sidebands being substantially lower in amplitude than the carrier frequency; and
providing the modulated signal to said first antenna for transmission.
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Accused Products
Abstract
A transmitter or a method for transmitting data from a first antenna imposes a low level phase modulation, for example of less than 90°, on a carrier signal in accordance with a data signal to create a modulated signal, preferably having a carrier frequency and sidebands, and the sidebands may be substantially lower in amplitude than the carrier frequency. The method may be used in an identification system, for example for identifying luggage or other items. In another aspect of an apparatus or method for transmitting data, a phase modulation may be imposed on a carrier signal in accordance with a data signal to create a modulated signal having a carrier and sidebands, where the amount of phase modulation being selected is such that the amplitude of the sidebands is substantially lower than that of the carrier. Phase modulation may be imposed by a mixer.
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Citations
38 Claims
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1. A method for transmitting data from a first antenna, said method including the steps of:
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providing a carrier signal;
imposing a phase modulation of less than 90°
on the carrier signal in accordance with a data signal to create a modulated signal having a carrier frequency and sidebands, the sidebands being substantially lower in amplitude than the carrier frequency; and
providing the modulated signal to said first antenna for transmission. - View Dependent Claims (2, 3, 4, 5)
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6. A transmitter including:
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a first antenna;
oscillator means for providing a carrier signal; and
mixing means for imposing a phase modulation of less than 90°
on the carrier signal in accordance with a data signal to create a modulated signal, the mixing means also providing the modulated signal to the first antenna for transmission, wherein the modulated signal has a carrier frequency and sidebands, the sidebands being substantially lower in amplitude than the carrier frequency. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for transmitting data from a first antenna, said method including the steps of:
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providing a carrier signal;
imposing a phase modulation on the carrier signal in accordance with a data signal to create a modulated signal having a carrier and sidebands, the amount of phase modulation being selected such that the amplitude of the sidebands is substantially lower than that of the carrier; and
providing the modulated signal to the first antenna for transmission. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A transmitter including:
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a first antenna;
oscillator means for providing a carrier signal; and
mixing means for imposing a phase modulation on the carrier signal in accordance with a data signal to create a modulated signal having a carrier and sidebands, the amount of phase modulation being selected such that the amplitude of the sidebands is substantially lower than that of the carrier, the mixing means also providing the modulated signal to the first antenna for transmission. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A transmitter including:
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a first antenna;
an oscillator for providing a carrier signal; and
a mixer for imposing a phase modulation of less than 90°
on the carrier signal in accordance with a data signal to create a modulated signal, the mixer also providing the modulated signal to the first antenna for transmission, wherein the modulated signal has a carrier frequency and sidebands, the sidebands being substantially lower in amplitude than the carrier frequency. - View Dependent Claims (33)
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34. A transmitter including:
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a first antenna;
an oscillator for providing a carrier signal; and
a mixer for imposing a phase modulation on the carrier signal in accordance with a data signal to create a modulated signal having a carrier and sidebands, the amount of phase modulation being selected such that the amplitude of the sidebands is substantially lower than that of the carrier, the mixer also providing the modulated signal to the first antenna for transmission.
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35. A method for transmitting data from a first antenna, said method including the steps of:
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providing a carrier signal;
imposing a low level phase modulation on the carrier signal in accordance with a data signal to create a modulated signal; and
providing the modulated signal to said first antenna for transmission. - View Dependent Claims (36)
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37. A transmitter including:
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a first antenna;
oscillator means for providing a carrier signal; and
mixing means for imposing a low level phase modulation on the carrier signal in accordance with a data signal to create a modulated signal, the mixing means also providing the modulated signal to the first antenna for transmission. - View Dependent Claims (38)
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Specification