公开(公告)号：KR1020030049302A

公开(公告)日：2003-06-25

申请号：KR1020010079479

申请日：2001-12-14

Applicant: 한국전자통신연구원

Inventor： 배재휘 ,  서재현 ,  김승원

IPC: H04N7/015

CPC classification number: H04L1/006 ,  H03M13/253 ,  H03M13/256 ,  H03M13/2936 ,  H03M13/6538

Abstract: PURPOSE: An apparatus for encoding a baseband in a digital broadcasting system and a method for modulating frequency using the same are provided to reduce a TOV(Threshold Of Visibility) by applying 1/2 TCM to a VSB transmitting system, thereby improving mobile environment receiving performance of the VSB transmitting system. CONSTITUTION: In an apparatus for encoding a baseband in a VSB(Vestigial Side Band) transmitting system, an interference filter pre-coder functioning as a filter reducing interchannel interference is removed. A code rate 1/2 TCM(Trellis Coded Modulation) coder has four signal levels by obtaining two-bit output signal to one-bit input signal by using two delayers(201,203) and a binary adder(202) in the baseband. A symbol mapper(204) has four output symbols by symbol-converting the four signal levels.

Abstract translation: 目的：提供一种用于对数字广播系统中的基带进行编码的装置以及使用该方法对频率进行调制的方法，以通过向VSB发送系统施加1/2 TCM来减少TOV（可见性阈值），从而改善移动环境接收 VSB传输系统的性能。 构成：在用于编码VSB（残留边带）传输系统中的基带的装置中，去除了用作减少信道间干扰的滤波器的干扰滤波器预编码器。 编码率1/2 TCM（网格编码调制）编码器通过在基带中使用两个延迟器（201,203）和二进制加法器（202），通过获得两位输出信号到一位输入信号，具有四个信号电平。 符号映射器（204）通过对四个信号电平进行符号转换而具有四个输出符号。

公开(公告)号：KR1020010083262A

公开(公告)日：2001-09-01

申请号：KR1019990061876

申请日：1999-12-24

Applicant: 한국전자통신연구원

Inventor： 황태원 ,  김재한 ,  한동석 ,  이규만 ,  서재현

IPC: H03F1/32

Abstract: PURPOSE: A fast adaptive predistorter using a look-up table and a method thereof are provided to be capable of using an existing HPA(High Power Amplifier) in conversion of a digital TV broadcasting and at any transmitter requesting an amplification of a communication signal by using a predistorter which is capable of processing data in real time. CONSTITUTION: A size of an output signal and a phase characteristics for an input signal of an HPA(High Power Amplifier) are gained from a multiplier(505), an HPA(High Power Amplifier)(506), a characteristics predictor of the HPA(507), and a subtracter(508). A sending signal size measuring machine(501), an LUT(Line Unit)(502), a time delayer(503), and an adapter(504) perform a pre-distorting on a signal in order to send it. A modeling of the characteristics predictor of the HPA(507) is quickly achieved for the initialization of the LUT(Line Unit)(502). A Vm(t)(509) is a signal to be transmitted and shows a sending signal after a modulating operation. The size of the sending signal(Vm(t)) is obtained from the sending signal size measuring machine(501).

Abstract translation: 目的：提供使用查找表的快速自适应预失真器及其方法，以便能够在数字电视广播的转换中使用现有的HPA（大功率放大器），并且在任何发射机上请求通信信号的放大 使用能够实时处理数据的预失真器。 构成：HPA（大功率放大器）的输入信号的大小和相位特性来自乘法器（505），HPA（大功率放大器）（506），HPA（大功率放大器）的特性预测器 （507）和减法器（508）。 发送信号尺寸测量机（501），LUT（线路单元）（502），时间延迟器（503）和适配器（504）对信号执行预失真以便发送。 对于LUT（线路单元）（502）的初始化，快速实现HPA（507）的特征预测器的建模。 Vm（t）（509）是要发送的信号，并且在调制操作之后示出发送信号。 从发送信号尺寸测量机（501）获得发送信号（Vm（t））的大小。