Pulse or digital communications – Repeaters – Testing
Patent
1995-10-31
1997-03-11
Bocure, Tesfaldet
Pulse or digital communications
Repeaters
Testing
375343, H04K 100
Patent
active
056109393
ABSTRACT:
A digital correlator used in a receiving component of a spread spectrum communication system of a direct sequence modulation type is disclosed. A polarity of an input baseband signal is controlled by being inverted or not inverted according to a polarity of a spreading code signal by an amplifier, and the input baseband signal controlled is converted by an analog-to-digital converter into a digital signal. The digital signal is integrated for a prescribed period in an integrator, and a square of an integrated digital signal is calculated in a squaring device to obtain a squared value indicating a degree of a correlation between the input baseband signal and the spreading code signal. In cases where the input baseband signal and the spreading code signal correlate with each other, the squared value gradually increases with the passage of time. In contrast, in cases where the input baseband signal and the spreading code signal do not correlate with each other, the squared value is maintained to a low value. Therefore, the digital correlator can be manufactured by a simplified configuration.
REFERENCES:
patent: 4291409 (1981-09-01), Weinberg et al.
patent: 4841544 (1989-06-01), Nuytkens
patent: 4933952 (1990-06-01), Albrieux et al.
patent: 4943976 (1990-07-01), Ishigaki
patent: 4995053 (1991-02-01), Simpson et al.
Onishi Hiroshi
Takahashi Ken'ichi
Takeishi Minako
Bocure Tesfaldet
Matsushita Electric - Industrial Co., Ltd.
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