Title :
Research on simple QPSK demodulation method in hierarchically modulated T-DMB system with DQPSK-QPSK
Author :
Bae, Jaehwui ; Kim, YoungSu ; Kim, Ju-yeon ; Lim, JongSoo ; Lee, Soo In ; Han, Dong-Soeg
Author_Institution :
Digital Broadcasting Dept., ETRI, Daejeon
Abstract :
We propose a simple QPSK demodulation method in hierarchically modulated T-DMB with DQPSK and QPSK. For the T-DMB system based on OFDM with DQPSK modulation, the data rate can be increased with hierarchical modulation by adding QPSK signal to existing DQPSK signal. The newly added QPSK can be restored with simple DQPSK signal estimation, which uses differential demodulation of DQPSK signal. We show the performance of a proposed method in mobile channel and static channels.
Keywords :
OFDM modulation; demodulation; digital audio broadcasting; digital video broadcasting; multimedia communication; quadrature phase shift keying; telecommunication channels; DQPSK signal estimation; OFDM; QPSK demodulation method; differential demodulation; hierarchically modulated T-DMB system; mobile channel; static channels; terrestrial digital multimedia broadcasting; Bandwidth; Degradation; Demodulation; Digital modulation; Digital multimedia broadcasting; Frequency estimation; Internet; OFDM modulation; Quadrature phase shift keying; Signal restoration; DQPSK Estimation; Hierarchical Modulation; LP Demodulation; T-DMB;
Conference_Titel :
Broadband Multimedia Systems and Broadcasting, 2008 IEEE International Symposium on
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-1648-6
Electronic_ISBN :
978-1-4244-1649-3
DOI :
10.1109/ISBMSB.2008.4536645
