Layered modulation for terrestrial ATSC applications
First Claim
1. A system for transmitting signals, comprising:
- a first antenna for transmitting an upper layer signal comprising an 8-VSB signal to at least one receiver; and
a second antenna for transmitting a lower layer signal to the at least one receiver;
wherein a layered modulation signal comprises the upper layer signal and the lower layer signal both interfering in a common frequency band such that the at least one receiver demodulates the upper layer signal directly from the layered modulation signal and demodulates the lower layer signal after subtracting the upper layer signal from the layered modulation signal.
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Accused Products
Abstract
Systems and methods are disclosed for applying layered modulation to an 8-VSB signal as used in the Advanced Television Systems Committee (ATSC) digital television signal. A system for transmitting the layered signal includes a first antenna for transmitting an upper layer signal comprising an 8-VSB signal and a second antenna for transmitting a lower layer signal. A layered modulation signal comprises the upper layer signal and the lower layer signal both interfering in a common frequency band. At least one receiver demodulates the upper layer signal directly from the layered modulation signal and demodulates the lower layer signal after subtracting the upper layer signal from the layered modulation signal. The second antenna can have a selectively limited range so that the lower layer signal does not interfere with the upper layer signal in a range where the lower layer signal could not be demodulated.
232 Citations
28 Claims
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1. A system for transmitting signals, comprising:
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a first antenna for transmitting an upper layer signal comprising an 8-VSB signal to at least one receiver; and a second antenna for transmitting a lower layer signal to the at least one receiver; wherein a layered modulation signal comprises the upper layer signal and the lower layer signal both interfering in a common frequency band such that the at least one receiver demodulates the upper layer signal directly from the layered modulation signal and demodulates the lower layer signal after subtracting the upper layer signal from the layered modulation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for transmitting signals, comprising the steps of:
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transmitting an upper layer signal with a first antenna, the upper layer signal comprising an 8-VSB signal to at least one receiver; and transmitting a lower layer signal with a second antenna to the at least one receiver; wherein a layered modulation signal comprises the upper layer signal and the lower layer signal both interfering in common frequency band such that the at least one receiver demodulates the upper layer signal directly from the layered modulation signal and demodulates the lower layer signal after subtracting the upper layer signal from the layered modulation signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for receiving layered signals, comprising:
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a first demodulator for demodulating an upper layer signal comprising an 8-VSB signal directly from a layered modulation signal, the layered modulation signal comprising both the upper layer signal a lower layer signal both interfering in a common frequency band; and a second demodulator for demodulating a lower layer signal after subtracting the upper layer signal from the layered modulation signal. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for receiving layered signals, comprising:
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demodulating an upper layer signal comprising an 8-VSB signal directly from a layered modulation signal, the layered modulation signal comprising both the upper layer signal and a lower layer signal both interfering in a common frequency band; and demodulating the lower layer signal after subtracting the upper layer signal from the layered modulation signal. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A system for transmitting signals, comprising:
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means for transmitting an upper layer signal comprising an 8-VSB signal to at least one receiver; and means for transmitting a lower layer signal to the at least one receiver; wherein a layered modulation signal comprises the upper layer signal and the lower layer signal both interfering in a common frequency band such that the at least one receiver demodulates the upper layer signal directly from the layered modulation signal and demodulates the lower layer signal after subtracting the upper layer signal from the layered modulation signal.
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28. A system for receiving layered signals, comprising:
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means for demodulating an upper layer signal comprising an 8-VSB signal directly from a layered modulation signal, the layered modulation signal comprising both the upper layer signal and a lower layer signal both interfering in a common frequency band; and means for demodulating a lower layer signal after subtracting the upper layer signal from the layered modulation signal.
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Specification