Abstract
International transmission experiments from Japan to Australia and from Korea to Japan using the multiple sub-Nyquist subsampling encoding (MUSE) signal were successfully carried out in 1988. The first transmission was conducted on a three-hop basis using CS-2, INTELSAT, and AUSSAT. The second was a live broadcast of the Seoul Olympic Games in combination with INTELSAT and BS-2. Both transmsissions obtained a carrier-to-noise ratio (CNR) of about 17.5 dB, which corresponds to the limit of perception of noise impairment. Excellent waveform transmission characteristics were also obtained by employing intermediate-frequency (IF) and baseband equalizers. It was concluded that international and domestic transmission of HDTV can be performed by existing satellites and earth stations without modifications, as long as modulators and earth stations are connected by an IF signal.
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