Abstract
The article describes a communication system with digital pseudo-random modulation. The system is one of the variants of spread spectrum radio communication systems. This communication system uses deterministic noise as the spreading sequence. The noise immunity of the considered communication system can be changed by scaling the spreading factor — the length of the modulation symbol. By increasing the spreading factor, not only an increase in the noise immunity of the system is achieved, but also the possibility of separating subscribers simultaneously operating in a common frequency band. It has been established that for communication systems with digital pseudo-random modulation, the length of the modulation symbol (the value of the spreading factor) and the number of subscribers to be separated are related by a quadratic dependence.
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