| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency in the utilization of transmission channel by estimating the necessity of learning information on the side of a receiver and controlling a transmitter while using a return channel. SOLUTION: A transmitter is formed of an information transmission format means 1, an information generator 2, a selecting means 3, a time reference 4, a modulator 5, a learning information transmitting means 12 and a transmission antenna 6. On the other hand, a receiver is formed of a reception antenna 8, a demodulating means 7, a time reference 9, a transmission quality evaluating means 13 for a transmission necessity estimating means 11, an evaluated transmission quality deterioration detecting means 14, and an inverse function executing means 10. Concerning a valid information received by the demodulator 7, whether the learning information is required or not is estimated by the transmission quality evaluating means 13 for the transmission necessity estimating means 11 and the evaluated transmission quality reduction detecting means 14. When it is estimated that the information is required, a signal C1 is transmitted through the return channel by the detecting means 14 and the learning information transmitting means 12 is switched so that the learning information can be transmitted by the transmitter. |
