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http://dx.doi.org/10.5909/JBE.2009.14.6.721

Analysis of laboratory test results on the constellation ratio in hierarchical modulation based AT-DMB  

Lee, Jae-Hong (Dept. of Electronics Computer Eng. Hanyang University)
Bae, Jae-Hwui (Next Generation Mobile Broadcasting Technology Research Team, Electronics and Telecommunication Research Institute)
Choi, Seung-Won (Dept. of Electronics Computer Eng. Hanyang University)
Publication Information
Journal of Broadcast Engineering / v.14, no.6, 2009 , pp. 721-732 More about this Journal
Abstract
AT-DMB system has been developed to increase data rate up to double of conventional T-DMB in same bandwidth while maintaining backward compatibility. The AT-DMB system adopted hierarchical modulation which adds BPSK signal or QPSK signal as enhanced layer to existing DQPSK signal. The enhanced layer signal should be small enough to maintain backward compatibility and to minimize the coverage loss of existing T-DMB service area. But this causes the enhanced layer signal of AT-DMB susceptible to fading effect in transmission channel. A turbo code which has powerful error correction capability is applied to the enhanced layer signal of the AT-DMB system for compensating channel distortion. We developed the prototype AT-DMB transmitter and receiver systems for performance evaluation. LAB test for analysing the effect of constellation ratio between existing base layer signal and enhancement layer signal, was conducted and the measurement results are shown with analysis comments.
Keywords
hierarchical modulation; Advanced T-DMB; Enhanced layer;
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