Automatic calibration device for direct spectrum spread receiver

Details Automatic calibration device for direct spectrum spread receiver Automatic calibration device for direct spectrum spread receiver

1990-10-25

1991-07-02

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

H04K 100

Patent

active

050291815

ABSTRACT:
A simulated reception signal is produced by modulating an AC signal having the same frequency as the reception frequency with a modulating signal produced using two pseudo noise codes delayed by 1/2 or 3 chips. In a calibrating mode, in which the simulated reception signal is chosen, a reference voltage to a comparator for synchronization detection and an output voltage of a differential amplifier for synchronization holding are stored in a CPU. In a receiving mode, in which an actual reception signal is chosen, the CPU controls the comparator and a pseudo noise generator which is included in a delay lock loop on the basis of the stored data.

REFERENCES:
patent: 4841545 (1989-06-01), Endo et al.
patent: 4932036 (1990-06-01), Goradia et al.
patent: 4943975 (1990-06-01), Kurihara et al.

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