| 摘要 |
PURPOSE:To demodulate the information signal based on the correlative output of each convolver by supplying 1st and 2nd reference signals to the 2nd inputs of two convolvers and the received spread spectrum signals to the 1st inputs of both convolvers respectively. CONSTITUTION:An inverted code PN1 of a 1st PN code is supplied to a 1st multiplier 20 together with the CW signal supplied via a phase shifter 24. While an inverted code PN2 of a 2nd PN code and the CW signal are supplied to a 2nd multiplier 21. The outputs va and vb of both multipliers 20 and 21 are supplied to a hybrid 19. Then the outputs vr1 and vr2 are supplied to the 2nd transducers 15 and 17 of two convolvers 10 and 11 respectively. The convolution outputs ve1 and ve2 are taken out of the gate electrodes 12 and 13 of convolvers 10 and 11 and the received signal vd is supplied to the 1st input transducers 14 and 15 respectively. Thus a BT product equal to the double fate length is obtained with use of two convolvers. |
