Digital receiver for spread-spectrum signals
AssigneeAscom Zelcom AG
InventorHans Kaufmann
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Abstract
The receiver contains a correlator (TIC) for the correlation of the received signal with a reference code (R(k)) and a digital signal processor for evaluating the results of the correlation. The correlator is constructed as digital, time-integrating, multistage correlator (TIC), the individual stages (Kl to KN) of which are connected on the one hand to a digital delay line (17) fed with the reference code (R(k)) and to which on the other hand a digital signal (S(k)) recovered from the received signal is applied, to length (D) of the delay line (17) being adapted to the maximum expected impulse response to the transmission channel.
Claims17
A digital receiver for receiving, as a received signal, direct-sequence spread-spectrum signals propagated over a transmission channel and generated by multiplication of an information-carrying signal by an auxiliary function, the digital receiver comprising:
- a digital, time-integrating multi-stage correlator for producing correlation output signals corresponding to correlations of the received signal with a reference code;
- a digital signal processor for processing the correlation output signals;
- means for recovering a digital signal from the received signal, the digital signal being supplied as a first input to each stage of the correlator;
- and
- a digital delay line having a length corresponding to a maximum expected length of an impulse response of the transmission channel carrying the direct-sequence spread-spectrum signals, an input which is fed with the reference code, and plural outputs corresponding to delayed reference codes which are successively time delayed with respect to each other and which are respectively connected to corresponding ones of the correlator stages as second inputs.
Dependencies are inferred from the claim text.