Apparatus for recovering carrier
First Claim
1. An apparatus for recovering a carrier, comprising:
- a signal converter outputting baseband I, Q signals by multiplying digitized passband I, Q signals by a complex carrier according to a phase error;
first and second filters removing data components of the baseband I, Q signals;
a divider dividing a signal outputted from the second filter by a signal outputted from the first filter;
a multiplier multiplying a signal outputted from the divider by the baseband I signal delayed for a predetermined time period; and
an oscillator generating the complex carrier according to a signal outputted from the multiplier.
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Accused Products
Abstract
An apparatus for recovering a carrier is disclosed, for recovering a carrier correctly even though ghost exists in a signal received in a television, which includes a signal converter outputting baseband I, Q signals by multiplying digitized passband I, Q signals by a complex carrier according to a phase error; first and second filters removing data components of the baseband I, Q signals; a divider dividing a signal outputted from the second filter by a signal outputted from the first filter; a multiplier multiplying a signal outputted from the divider by the baseband I signal delayed for a predetermined time period; and an oscillator generating a complex carrier according to a signal outputted from the multiplier.
15 Citations
12 Claims
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1. An apparatus for recovering a carrier, comprising:
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a signal converter outputting baseband I, Q signals by multiplying digitized passband I, Q signals by a complex carrier according to a phase error; first and second filters removing data components of the baseband I, Q signals; a divider dividing a signal outputted from the second filter by a signal outputted from the first filter; a multiplier multiplying a signal outputted from the divider by the baseband I signal delayed for a predetermined time period; and an oscillator generating the complex carrier according to a signal outputted from the multiplier. - View Dependent Claims (2, 3, 4)
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5. A method for recovering a carrier 1 comprising:
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(a) converting digitized passband I, Q signals to baseband I, Q signals; (b) removing data components from the baseband I, Q signals; (c) dividing the baseband Q signal having the data component removed therefrom by the baseband I signal having the data component removed therefrom; (d) delaying the baseband I signal having the data component removed therefrom for a predetermined time period, and multiplying the delayed baseband I signal by the division result; and (e) generating a complex carrier according to the multiplication result. - View Dependent Claims (6)
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7. An apparatus for recovering a carrier, comprising:
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a signal converter outputting baseband I, Q signals by multiplying digitized passband I, Q signals by a complex carrier according to a phase error; first and second filters transmitting pilot components of the baseband I, Q signals; a divider dividing the pilot component of the baseband Q signal by the pilot component of the baseband I signal; a delay delaying the pilot component of the baseband I signal for a predetermined time period; a gain multiplier multiplying a signal outputted from the divider by a constant gain according to a signal outputted from the delay; a multiplier multiplying a signal outputted from the gain multiplier by the signal outputted from the delay; and an oscillator generating the complex carrier according to a signal outputted from the multiplier. - View Dependent Claims (8)
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9. A method for recovering a carrier, comprising:
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(a) outputting baseband I, Q signals by multiplying digitized passband I, Q signals by a complex carrier according to a phase error; (b) filtering the baseband I, Q signals to transmit pilot components thereof (c) dividing the pilot component of the baseband Q signal by the pilot component of the baseband I signal; (d) delaying the pilot component of the baseband I signal for a predetermined time period, and multiplying the division result by a constant gain according to the pilot component of the delayed baseband I signal; and (e) generating the complex carrier according to the multiplication result. - View Dependent Claims (10)
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11. An apparatus for recovering a carrier, comprising:
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a signal converter to output baseband I and Q signals based on a complex carrier; at least one filter to remove data components of the baseband I and Q signals and to output filtered baseband I and Q signals; a divider to divide the filtered baseband Q signal by the filtered baseband I signal; a first multiplier to multiply a signal outputted from the divider by the filtered baseband I signal delayed for a predetermined time period; and an oscillator to generate the complex carrier according to a signal outputted from the first multiplier and to supply the complex carrier to the signal converter. - View Dependent Claims (12)
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Specification