| Summary: | 碩士 === 高苑科技大學 === 電機工程研究所 === 100 === This paper is proposed to study Europe broadcast standard DVB-T (Digital Video Broadcasting-Terrestrial) , while the bandwidth is set to 6/7/8 MHz condition. And we measure all C/N values and data rates when all parameters are confront with mosaic condition.
We adopted professional instrument to measure all parameters , while the RF (Radio Frequency) output power is set -50dB , the bandwidth is 6 MHz , the fixed receiver is 2K mode and the mobile receiver is 8Kmode The carrier modulation is set in QPSK , 16-QAM and 64-QAM , while the code rate is set 1/2 , 2/3 , 3/4 ,5/6 and 7/8 , Guard Interval (GI) is set to 1/4 , 1/8 , 1/16 and 1/32. We match the relative bit rate and the data Rate of transfer Stream. Then, we set all parameter in SFE100 test equipment. Finally , we measure and record all C/N value when all parameters are confront with mosaic condition.
Test results show that the data rate is the maximum volume value when the modulation is set at 64-QAM , guard interval is 1/4 and the Code Rate is 7/8. Moreover, the data rate is the minimum volume value when the modulation is set at QPSK , guard interval is 1/32 and the Code Rate is 1/2. Furthermore, the C/N value in 6 MHz bandwidth is about 25.8 in distortion condition when the modulation is set at 64-QAM , and the Code Rate is 7/8. In the same situation , the C/N value in 6 MHz bandwidth is about 7.2 in mosaic condition when the demodulation is set at QPSK , and the Code Rate is 1/2.
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