| 摘要 |
PURPOSE:To keep constant the output of a convolver used for the reception part of a spread spectrum communication equipment, to obtain satisfactory code synchronism and to improve an error rate. CONSTITUTION:The output of an envelop detector 7 detected by a reception AGC (part A) is not used only for one input of a convolver 13 but fed back to a convolver output part (part C) and an error amplifier 16 is operated only when the level of the received signal is lower than a certain prescribed level. Then, the output of the convolver 13 is controlled by controlling a newly provided variable attenuator 17. Thus, even when the input level of the received wave exceeds the control range of the reception AGC, the convolution output can be fixed. |
