MULTIPLE ACCESS INTERFERENCE PROTECTION IN MULTICHANNEL DATA TRANSMISSION SYSTEMS

The article presents the results of research on the protection of multichannel data transmission systems with channel division by the signal form (code) from unauthorized access. It is proposed to use derivatives of Walsh functions as spreading codes used in the formation of noise-like signals in multichannel communication systems. The analysis showed that the correlation properties of the derivatives of Walsh functions used as spreading codes have significantly better correlation characteristics than the original Walsh functions. It was justified the advantage of using these signals in the development of CDMA systems in order to reduce the interference level of multiple access and protection against unauthorized access.