以軟體定義無線電實現DVB-T基頻解調解碼接收機;Implementation of DVB-T Baseband Demodulation and Decoder Receiver with a SDR Platform

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Communication Engineering > Electronic Thesis & Dissertation > Item 987654321/80955

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Title:	以軟體定義無線電實現DVB-T基頻解調解碼接收機;Implementation of DVB-T Baseband Demodulation and Decoder Receiver with a SDR Platform
Authors:	林晉琨;Lin, Chin-Kun
Contributors:	通訊工程學系
Keywords:	數位電視地面廣播;解調;OFDM
Date:	2019-05-06
Issue Date:	2019-09-03 15:21:38 (UTC+8)
Publisher:	國立中央大學
Abstract:	實驗室以務實軟體定義無線電(Software-defined Radio,SDR)來實現DVB-T接收機，結合FPGA(XC7A200T)及射頻模組(AD9361)完成軟體定義無線電平台，本論文設計基頻電路來進行DVB-T訊號解調，基頻接收機需要的模組包括降頻取樣、時間同步、頻率同步、快速傅立葉轉換、通道估測等化、符元解交錯器、軟式決策、位元解交錯器、迴旋碼解碼、外部解交錯器、里德所羅門碼解碼、解亂碼器，將解調解碼得到之MPEG-2傳輸封包資料流用VLC多媒體播放器播出。先實錄訊號以Matlab進行解調，再使用硬體描述語言設計基頻電路，用iSim模擬電路時序後，再以軟體定義無線電平台實錄訊號驗證其硬體功能，經過解調解碼後，便能夠得到MPEG-2(Moving Picture Experts Group, MPEG) Transport Stream，將之播放以驗證接收機之成果。 ;Our laboratory use Realistic Software-defined Radio platform to implement Digital Video Broadcasting Terrestrial(DVB-T) receiver. We combine FPGA and Radio Frequency module(AD9361) to finish SDR platform. In this thesis, we design baseband receiver for demodulation and Decoder DVB-T signal. This baseband receiver needs the digital signal processing units which are down sampling, time synchronizer, frequency synchronizer, Fast Fourier Transform processor, channel estimator, channel equalizer, symbol de-interleaver, soft decision, bit de-interleaver, Viterbi decoder, packet synchronizer, outer de-interleaver, Reed Solomon decoder, de-scrambler. The signal which is under demodulation and decoder is MPEG-2 Transport Stream, and we can play the video via VLC player. First, we record DVB-T signal on Matlab and demodulate the signal. Furthermore, we design baseband digital signal processing units by using Verilog hardware description language and verify with iSim. Then, the real-time hardware is implemented and verified with SDR platform. After it is under demodulation and decoder, we are able to get MPEG-2 Transport Stream. We could play this Transport Stream to verify baseband receiver’s result.
Appears in Collections:	[Graduate Institute of Communication Engineering] Electronic Thesis & Dissertation

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