| 摘要 |
PROBLEM TO BE SOLVED: To improve the reliability of data transmission and to receive data very approximating transmitted data. SOLUTION: The signal obtained by modulating a carrier wave 2 by an information signal in a primary modulator 1 is supplied to a secondary modulator 3. The spread signal from a spreading code generator 4 is supplied to the secondary modulator 3, and the signal from the primary modulator is modulated to the spread signal in the secondary modulator 3 by this spread signal, and this modulated spread signal is inputted to a spread duplexing part 5 and is duplexed and is transmitted from an antenna 6. |
