公开(公告)号：US20080137775A1

公开(公告)日：2008-06-12

申请号：US11931074

申请日：2007-10-31

Applicant: Tae Hoon KIM ,  In Ki LEE ,  Seung Hyun CHOI ,  Cheon In OH ,  Dae Ig CHANG ,  Ho Jin LEE ,  Sung Hoon LEE ,  Goon Seop LEE ,  Dong Hahk LEE ,  Jae Hwang YU

Inventor： Tae Hoon KIM ,  In Ki LEE ,  Seung Hyun CHOI ,  Cheon In OH ,  Dae Ig CHANG ,  Ho Jin LEE ,  Sung Hoon LEE ,  Goon Seop LEE ,  Dong Hahk LEE ,  Jae Hwang YU

IPC: H04L27/20 ,  H03D3/22 ,  H04L27/22

CPC classification number: H04L27/183

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.

Abstract translation: 提供了一种用于数字多媒体广播（DMB）系统中的分级调制和解调的方法和装置。 数字广播信号发射机中的分级调制方法包括以下步骤：从外部接收第一广播信号和第二广播信号，并分别通过第一种方法和第二种方法对广播信号进行编码; 合成编码的第一和第二广播信号; 使用与合成信号对应的I-Q平面的星座图确定调制点; 以及使用所确定的调制点对合成信号进行分层相移。 这里，在I-Q平面中，调制点偏离了通过第一广播信号的调制点的相位轴和I-Q平面的原点的预定偏差角。