| 摘要 |
PURPOSE:To provide a digital matched filter by which a desired signal can be precisely obtained without performing a complicated operation such as power control at a transmitter side and by eliminating disturbance by performing processing at a receiver side in an SS communication system. CONSTITUTION:A reception signal bi-sected to two channels and frequency- converted to a baseband is A/D-converted by A/D converters 7, 8, and is made into multi-bits, and each bit signal takes correlation with a preset value at correlators 9, 10. Each correlative output is inputted to and weighed at weight circuits 11, 12 via wiring change-over switches 18, 19, and is added at adder circuits 13, 14, and is squared at square circuits 15, 16, and each output is added at an adder circuit 17, then, a correlation signal can be obtained. Such correlation signal is compared with the preset value at a correlative value decision circuit 20, and the wiring change-over switches 18, 19 are operated by a control signal based on the above comparison result, and the wiring of the correlators, 9, 10 are replaced, then, an effect of weight shift can be obtained essentially. |
