APPARATUS AND METHOD FOR NORMALIZING ADVANCED TERRESTRIAL DIGITAL MULTIMEDIA BROADCASTING HIERARCHICALLY MODULATED SYMBOL

摘要

PURPOSE: An apparatus and a method for normalizing advanced terrestrial digital multimedia broadcasting layer-modulated symbol are provided to reduce errors in transmission power margin calculation of an AT-DMB transmitting end by improving the normalization in a layer-modulated B-mode and a layer-modulated Q-mode. CONSTITUTION: A base layer symbol generating unit(310) creates a base layer symbol. An enhancement layer symbol generating unit(320) creates an enhancement layer symbol. A processing unit(330) controls the size of the enhancement layer symbol. The processing unit diversifies the location of the enhancement layer symbol based on the relation with the base layer symbol. The layer-modulated symbol generating unit(340) produces the layer-modulated symbol by synthesizing the base layer symbol and the enhancement layer symbol. A layer-modulated symbol normalizing unit(350) normalizes the layer-modulated symbol using the fixed normalization parameter based on the constellation ratio of the layer modulation.