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Heterodyne-Type Autocorrelator for SS-DS Communications
Akihiro KAJIWARA Masao NAKAGAWA
IEICE TRANSACTIONS on Communications
Publication Date: 1991/05/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Spread Spectrum Techniques and Its Applications)
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This paper shows a heterodyne-typed autocorrelator for direct-sequence spread-spectrum (SS-DS) communications, without using local despreading PN-code and active synchronization circuit. In our proposed autocorrelator, the transmitting SS-DS signal is frequency-converted on every second data by the unique frequency assigned to each user in advance, which is separated not so as to interfere with each other. The received signal is autocorrelated with the delay version and becomes the narrowband signal with the unique centerfrequency. Therefore, our proposed autocorrelator can provide the anti-narrowband interference and random access capability, unlike the conventional autocorrelators.