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Conference Paper
Design and Implementation of 6/12MHz Switchable QAM Modulator based on DOCSIS 3.0
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- Authors
- Sang-Jung Ra, Dong-Joon Choi, Namho Hur
- Issue Date
- 2011-09
- Citation
- International Conference on Information and Communication Technology Convergence (ICTC) 2011, pp.652-655
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- In this paper, we present an efficient design and implementation of downstream QAM modulator for Digital CATV transmission. The Digital CATV transmission system enables the cable operators to offer high-speed multimedia service for Digital CATV subscribers in HFC network. 6/12MHz switchable QAM modulator for Digital CATV transmission is proposed and implemented in field programmable gate arrays (FPGAs). The Modulator, which can be modulate switchable bandwidth (6 or 12 MHz), consists of FEC encoder, a post-forward error correction (FEC) and a digital to analog converter (DAC). We measure the spectrum of QAM modulator output. Measured results show the maximum transmitted error vector magnitude (EVM) of 0.62% (64-QAM/6MHz), 1.05% (64-QAM/12MHz) and 0.69% (256-QAM/6MHz), 1.12% (256-QAM/12MHz). © 2011 IEEE.
- KSP Keywords
- 256-QAM, 64-QAM, Field-Programmable Gate Array(FPGA), Forward Error Correction(FEC), HFC network, High Speed, Multimedia Service, Transmission system, design and implementation, digital-to-analog converters, downstream QAM modulator