By Topic

Directional Diversity Reception for Hierarchically Modulated T-DMB System

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
Jaehwui Bae ; Dept. of ETRI, Electron. & Telecommun. Res. Inst., Daejeon ; Youngsu Kim ; Ju-Yeun Kim ; Jongsoo Lim
more authors

We propose a reception improvement method for OFDM based DQPSK-QPSK hierarchical modulation system in severe multipath channels using directional diversity. In an OFDM based transmission system with DQPSK modulation, data rate can be increased with hierarchical modulation by adding new QPSK signal to existing DQPSK signal. New added QPSK signal has much smaller amplitude compared with the existing QPSK signal to reduce the influences on the existing DQPSK signal, so the reception performance of new added QPSK signal is degraded when there are severe multipaths interferences due to small amplitude. To overcome this problem, the directional diversity is suggested. By applying directional diversity, we can eliminate undesired multipaths and change the reception channel characteristics near to frequency flat fading, so improve reception performance. We demonstrate the performance of proposed method under severe multipath channel and show it can improve the reception of new added QPSK signal.

Published in:

Vehicular Technology Conference, 2008. VTC 2008-Fall. IEEE 68th

Date of Conference:

21-24 Sept. 2008