| 摘要 |
PURPOSE:To prevent the quality of a circuit from deterioration due to attenuation caused by rainfall, by encoding always a signal to be transmitted from an earth station to correct its error and assigning an error correction decoding circuit with high gain only to a necessary channel on a communication sattelite. CONSTITUTION:A TDMA signal received in a form containing an error correcting code is amplified, frequency-converted 2 and then demodulated 3. At the usual time, each burst data is picked up and errors are detected through a switch 4, inputting to a base band processor 7 through a buffer memory 6. An error correction switching controlling device 8 monitors channels of which errors are increased by rainfall or the like, and if the errors of a data burst of a certain channel are increased, the errors of the burst of the channel concerned are corrected 10 with high gain through a buffer memory 9 and the corrected signal is inputted to the base band processor 7 through a buffer memory 11. The error correction switching controlling device 8 monitors a pass memory part in the high-gain error correction decoding circuit 10 or the metric status of each pass, and when the errors are reduced, returns the memory part or the metric status to the original status. |
