TRANSMISSION DEVICE AND AUTOMATIC GAIN CONTROL METHOD

摘要

A transmission control section (101) temporarily accumulates transmission signals and output them to an encoding section (102) while outputting transmission timing information to a counter section (107). A preamble insert section (104) inserts the number of AGC preambles set by a number-of-preambles control section (110) into the transmission signals. The number-of-preambles control section (110) compares the transmission time interval input from a subtraction section (109) to a threshold value. If the transmission time interval is equal to or above the threshold value, it is decided that 10 AGC preambles be inserted into the transmission signals. If the transmission time interval is below the threshold value, it is decided that 5 AGC preambles be inserted into the transmission signals. Thus, it is possible to obtain both of the transmission efficiency and the error ratio characteristic.