Performance Analysis of Time Domain LDM of Next Generation DTTB Under ISDB-T

Abstract

For the 4K$\cdot$8K terrestrial TV (UHDTV) broad-casting in Japan, research is conducted to improve transmission speed by simultaneously transmitting advanced digital terrestrial television broadcasting (DTTB). Currently, the frequency band allocated to terrestrial broadcasting is strained, and there is an issue of not having enough bandwidth available to introduce next-generation DTTB. In Japan, Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) is used for terrestrial broad-casting. To introduce the next-generation DTTB while broadcasting ISDB-T, the Layered Division Multiplexing (LDM) method has been proposed. LDM enables ISDB-T and next-generation broadcasting to communicate in the same frequency band. The previous study proposed a time-domain LDM scheme, but its communication accuracy was lower than that of frequency-domain LDM. In this study, by improving the sampling conversion accuracy of time-domain LDM, the communication accuracy was improved over frequency-domain LDM in the Additive white Gaussian noise (AWGN) channel. The communication characteristics are evaluated when the coding rate and constellations are changed using this result.