| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain both characteristics of good reception sensitivity and an intermodulation in all reception input range by accurately controlling a gain even if a severe fading occurs. SOLUTION: A threshold setter 17a outputs a decision result in response to a level of an Ec/Io to be input from a digital signal processor 16a, and a control memory 18a outputs a set value of the gain corresponding to the input decision result to an analog converter 19 to set a gain of an amplifier (not shown). An Ec/Io monitor 23 measures the Ec/Io, the signal processor 16a monitors an occurrence of a fading from the measured result, outputs the Ec/Io averaged at each one chip to the setter 17a and a digital signal adder 20 when the fading occurs so that the Ec/Io decrease from the threshold, rapidly controls the gain and changes the set value to be set in the memory 18a to a set value becoming a higher gain than a normal set value.</p> |
