Recepteur pour communications par etalement du spectre

Empfänger für spreizspektrumübertragung

Receiver for spread spectrum communication

Abstract

A receiver for spread spectrum communication which does not require any highly accurate, highly stable VCO for its local signal generator. The receiver has a correcting circuit which corrects base-band signals obtained by compression-back, a RAKE circuit which demodulates the corrected base-band signals to reproduce information, and a re-modulating circuit which generates signals similar to primary modulated signals on the transmission side by re-modulating demodulated signals outputted from the RAKE circuit, a multiplying circuit which multiplies the complex conjugate of the output of the re-modulating circuit by the base-band signals and outputs signals obtained by eliminating the modulated components of the base-band signals from the product, an averaging circuit which removes the noise component of the base-band signals by averaging the output of the multiplying circuit and outputs only the frequency offset component of the received signals and local signals, and a circuit which obtains the angular velocity of the frequency offset component and uses, as correcting signals, the signals having the angular velocity and the polarity opposite to that of the base-band signals. The receiver eliminates the frequency offset components by means of the correcting circuit.

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Description

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NO-Patent Citations (1)

    Title
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