出版社：The Institute of Image Information and Television Engineers
摘要：The draft standard for Digital Terrestrial Television Broadcasting (DTTB) was approved in the Telecommunication and Technology Council (TTC) in September 1997. Practical field trials using Tokyo tower were carried out from November 1998 to March 1999. The transmission scheme of DTTB was fixed in May 1999. This paper describes the fixed reception performance of the practical field trials using one transmitter and two SFN transmitters. The results using one transmitter show that a 35.5 dB (pV) receiver input level is needed for a correct reception rate of 99% at all measured points in the case of 64 QAM-OFDM modulation with a 7/8 coding rate. In the SFN field trials using two transmitters, preferable results are obtained when the transmitters have optimum transmission timing. But if the OFDM demodulator can not adjust the FFT window position, there will be measuring points at which correct reception can not be achieved.
