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

fYear

2008

Firstpage

1

Lastpage

5

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISBMSB.2008.4536645

Filename

4536645