公开(公告)号：US20080137775A1

公开(公告)日：2008-06-12

申请号：US11931074

申请日：2007-10-31

申请人： 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

发明人： 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分类号： H04L27/20 ,  H03D3/22 ,  H04L27/22

CPC分类号： H04L27/183

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20110241937A1

公开(公告)日：2011-10-06

申请号：US13077278

申请日：2011-03-31

申请人： Seung Hyun CHOI ,  Jae Hyun Kim ,  In One Joo ,  Cheon Sig Sin ,  Sang Uk Lee

发明人： Seung Hyun CHOI ,  Jae Hyun Kim ,  In One Joo ,  Cheon Sig Sin ,  Sang Uk Lee

IPC分类号： G01S19/30

CPC分类号： G01S19/29 ,  G01S19/30

摘要： An apparatus for signal acquisition of a Global Navigation Satellite System (GNSS) receiver may downsample digitalized satellite signals based on a code resolution, correlate the downsampled satellite signals and oversampled pseudo-random noise (PRN) codes using a block unit based on a size of a matching filter, and may perform FFT of a value output as a correlation result by employing, as M points, a number of blocks used for the matching filter. Also, the signal acquisition apparatus may estimate a coarse Doppler and a code phase of the satellite signals by comparing a power value, calculated based on the M-point fast Fourier transformed value, with a threshold value, and may estimate a fine Doppler using zero-padding based FFT when the satellite signals are successfully acquired.

摘要翻译： 用于信号采集全球导航卫星系统（GNSS）接收机的装置可以基于码分辨率对数字化的卫星信号进行采样，将下采样的卫星信号和过采样的伪随机噪声（PRN）码相互关联，使用块单位， 匹配滤波器，并且可以通过使用用于匹配滤波器的块的数量作为M个点来执行值输出的FFT作为相关结果。 此外，信号获取装置可以通过将基于M点快速傅立叶变换值计算的功率值与阈值进行比较来估计卫星信号的粗略多普勒和码相位，并且可以使用零估计精细多普勒 当成功获取卫星信号时基于FFT的FFT。