标题: QAM 与 VSB 共用的高画质电视数据机
An HDTV Modem that Accommodates both QAM and VSB
作者: 叶文树
Yeh, Wen-Sue
杭学鸣
Hang Hsueh-Ming
电子研究所
关键字: 高画质电视;接收器;频道编码;时脉回复;载波回复;等化器;HDTV;Receiver;Channel coding;Timing recovery;Carrier Recovery;Equalizer
公开日期: 1995
摘要: 不论是经由空中或电缆, VSB 与 QAM 两种数位调变的技术皆可以用来传
送 HDTV 的讯号.如果能够设计单一个接收器来合并这两者将是更符合经
济效益的做法. 在这篇论文中, 我们首先比较并分析 VSB 与 QAM 这两类
讯号, 并且根据先前的研究结果指出 VSB是可以被视为 SQAM 的一种特
例, 我们提出一个类似 QAM 接收器的架构来解调 QAM 和 VSB 讯号.在设
计的过程中, 我们针对时脉回复及载波回复和频道等化分别尝试不同的理
论与方法.而频道编码设计及整个完整的系统亦在电脑模拟之中. 最后模
拟的结果显示出这样的一个双功能的接收器不论对于 QAM 或 SQAM(VSB)
讯号都能正确地将其解调.
Two digital modulation techniques, VSB and QAM, may be used for
transmitting HDTV signals over the air and/or the cable. It
wouldbe more economical if a single receiver can be designed to
accommodateboth signals. In this thesis, we first compare and
analyze the VSB andthe QAM signals, and then based on
previousresearch results that VSBcan be viewed as SQAM, we
propose a modified QAM receiver structure that can also
demodulate SQAM signals. In the design process, we study,
simulate and compare various algorithms for timing recovery,
carrierrecovery and channel equalization. Also simulated is the
channel coding schemes and the complete system. The results
indicate that such a dual-function receiver works equally well
for both QAM and SQAM (VSB).
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT840430045
http://hdl.handle.net/11536/60645
显示于类别:Thesis