초록 ▼

The amplitude level of a received signal is controlled by a variable gain amplifier and the amplitude level controlled received signal is converted to a digital signal by an A/D converter. Correlation or demodulation of the digitally converted signal is then established by a correlator. A correlated

The amplitude level of a received signal is controlled by a variable gain amplifier and the amplitude level controlled received signal is converted to a digital signal by an A/D converter. Correlation or demodulation of the digitally converted signal is then established by a correlator. A correlated output comparator compares an output signal from the correlator with a prescribed threshold value to establish correlated synchronization using the output signal form the correlator and performs initial synchronization using the comparison output. The output amplitude level of the variable gain amplifier is controlled in accordance with an output amplitude from the correlator. The gain of the variable gain amplifier is switched to the maximum value by a switch dependent on presence of a synchronization establishment signal for the correlation synchronizing circuit.

대표청구항 ▼

[ What is claimed is:] [1.] A spread spectrum signal receiver, comprising:variable gain amplifying means for amplifying a received signal;converting means for converting an output signal from said variable gain amplifying means to a digital signal;correlating means for finding correlation between th

[ What is claimed is:] [1.] A spread spectrum signal receiver, comprising:variable gain amplifying means for amplifying a received signal;converting means for converting an output signal from said variable gain amplifying means to a digital signal;correlating means for finding correlation between the digital signal and a spread code;correlation synchronizing means for comparing an output signal from said correlating means with a predetermined threshold value to obtain correlation and synchronization by using the output signal from said correlating means, for performing initial synchronization and for performing synchronization protection after synchronization is established;gain control means responsive to establishment of synchronization by said correlation synchronizing means for controlling an amplitude level of the output signal of said variable gain amplifying means based on an amplitude of the output signal of said correlating means; andswitching means for switching a gain of said variable gain amplifying means to a maximum gain in accordance with presence of a synchronization establishment signal from said correlation means.