METHOD AND APPARATUS FOR HIERARCHICAL MODULATION AND DEMODULATION IN DIGITAL BROADCASTING SYSTEM
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United States of America Patent
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Issued Date -
Jun 12, 2008
app pub date -
Oct 31, 2007
filing date -
Dec 7, 2006
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Abandoned
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Abstract
Provided are a method and apparatus for hierarchical modulation and demodulation in a Digital Multimedia Broadcasting (DMB) system. The method for hierarchical modulation in a digital broadcast signal transmitter includes the steps of: receiving a first broadcast signal and a second broadcast signal from outside, and encoding the broadcast signals by a first method and a second method, respectively; synthesizing the encoded first and second broadcast signals; determining a modulation point using a constellation diagram of an I-Q plane corresponding to the synthesized signal; and hierarchically phase-shift modulating the synthesized signal using the determined modulation point. Here, in the I-Q plane, the modulation point is deviated by a predetermined deviation angle from a phase axis passing through a modulation point of the first broadcast signal and an origin of the I-Q plane.
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