APPARATUS FOR ADAPTATION/VARIABLE TYPE MODULATION AND DEMODULATION IN DIGTAL TX/RX SYSTEM

摘要

PURPOSE: An adaptable/variable type modulating and demodulating apparatus in a digital cable transceiving system is provided to enhance channel equalization performance occurring in higher-order modulation and demodulation. CONSTITUTION: A QAM(Quadrature Amplitude Modulation) unit(313) determines a symbol using a non coding bit group. A convolutional interleaver(315) convolutionally interleaves the determined symbol. A training sequence symbol generating unit(317) outputs one predetermined training sequence symbol.