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METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF A DIGITAL TELEVISION SIGNAL USING MULTICARRIER MODULATION
METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF A DIGITAL TELEVISION SIGNAL USING MULTICARRIER MODULATION
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机译：利用多载波调制传输和接收数字电视信号的方法和装置
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摘要
A method and apparatus for modulating and demodulating an MCMtelevision signal is described which is particularly useful in proposed"simulcast" HDTVterrestrial broadcasting. The MCM spectrum of the television signal is shapedusingweighting coefficients which are derived from either an idealized NTSC signalor anactual NTSC co-channel signal. These coefficients are used to shape therespectiveMCM carriers to provide an energy distribution in the MCM signal whichprovidesgreater degree of robustness with a minimum degree of co-channel interferenceto andfrom an NTSC co-channel signal. The instant invention further takes advantageof theinterference characteristics of composite television signals described above,to positionthe placement of the MCM carriers in frequency, to minimize interference withanNTSC co-channel signal. Several methods of deriving the weighting coefficientsaredescribed including an adaptive approach whereby the characteristics of theinterferingNTSC transmission are received and the instantaneous NTSC spectrum calculatedtherefrom and weighting coefficients assigned accordingly. These coefficientscan betransmitted to a receiver to update its coefficient table.
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