| Summary: | 碩士 === 國立宜蘭大學 === 電機資訊學院碩士在職專班 === 100 === This thesis is to study a new generation of ground-air digital broadcast DVB-T2 of LDPC Code applied research applied to OFDM channel. Channel source encoding the proposed high-definition TV H.264 is a new generation of video compression technology as the Source Coding. Channel coding using 4QAM, 16QAM, 64QAM and future applications of 256QAM OFDM transmission channel due to noise interference and multipath (Multi path) and other factors, so in addition to general the AWGN the Channel, and Rayleigh Fading Channel, Doppler Effect simulation.
Of LDPC Code confidence spread soft decision iterative decoding algorithm to decode the calculus, and with QAM using the LLR soft decision output. This paper also proposed the theory of evolution to improve the performance of LDPC the Code of probability density, excellent performance in the simulation. In addition, the threshold optimization of LDPC + BCH Code cascade code simulation to identify the recommended value.
Finally, the current public television service HiHD actual broadcast video as a channel source coding, OFDM channel analog to verify the feasibility of this thesis.
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