Abstract
The article discusses the question of direct spectrum expansion with sequences formed by cascading other sequences. The effect of sampling frequency detuning and local oscillator frequency on the possibility of receiving a noise-like signal of a given duration is analyzed. Expressions are given for the critical values of frequency detuning depending on the duration of the spreading sequence and the carrier frequency of the signal. A cascade method for generating a spreading sequence is proposed, along with transmitter and receiver circuits for its implementation. The results of modeling the circuit operation, when a differential encoder and a differential decoder are added, are presented. The economy of hardware resources when implementing the proposed scheme in comparison with a conventional matched filter, the stability of the communication system to noise, and frequency detuning are analyzed.
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