衛星ISDBの伝送容量の検討

抄録

Among the QPSK+concatenated code of the RS and some punctured convolutional codes, and TCM8PSK, the most appropriate transmission scheme and the maximum transmittable information bit rate for satellite ISDB are indicated based on the simulation. Assuming a high power TWTA and an output multiplex filter with a contiguous characteristic, the simulation has carried out. As interferences, upper and lower adjacent channel are considered for the new digital channels. In the case of WARC-BS criteria, the maximum transmission rate is limited to 25 Mbaud so as not to interfere with the MUSE signals in the adjacent channel. This paper figures out the appropriate schemes with a variety of parameters. These results show that the TCM8PSK can be preferable for achieving a high spectrum efficiency in high power direct broadcasting satellite channels for the service availability of 99.7% in the worst month. In the case of a higher service availability of 99.9% or in the case of a low eirp satellite, QPSK+the concatenated code shows better performances.