地上波ディジタルTV放送のSFN中継における送信指向性アンテナの利用

抄録

In DTTB, OFDM scheme is studied in Japan, and it's said a merit of this scheme is to construct SFN. It's true that SFN may contribute the effective use of frequencies, but coupling and oscillation occur in relay station because of using the same frequency between transmitting and receiving antennas. One of this solution is to separate both antennas far apart, but, the size of the relay station becomes too large. So, in this paper, we propose a directional transmitting antenna on main broadcasting station. In fact, by numerical analysis using the parameter of Maebashi station and Shimonita relay-station in Gumma-Pref, the proposed scheme is effective in realization of SFN which makes the most of the existing relay system.