| 摘要 |
PROBLEM TO BE SOLVED: To realize a two-frequency network system capable of easily obtaining the effect of diversity in a frequency diversity system based on orthogonal frequency division multiplex(OFDM), thereby manufacturing inexpensive receivers and suppressing the reduction of frequency application efficiency. SOLUTION: Each of transmission stations A to D constitutes an SFN in accordance with frequency bands f1, f2. Information required of high receiving quality out of information transmitted by the frequency bands f1, f2 is transmitted by both of the bands f1, f2, and on a receiving point R, the diversity of these band f1, f2 is received. The correlation value of receiving signals of the bands f1, f2 on the receiving point R can be reduced by setting up the transmission power of the bands f1, f2 respectively to different values in each transmission station, so that effective diversity reception can be attained. Since only a part of information transmitted by using these frequency bands f1, f2 is the same, the reduction in the application efficiency of the frequency bands f1, f2 can be suppressed. |
