Fuzzy binary sequences for secure spread-spectrum systems

Abstract

In this paper, we describe the generation of pseudo-random (PN) binary sequences using a technique based on fuzzy logic. The generated fuzzy binary sequences are shown to have good randomness properties and their length can be made extremely long. Such sequences are suitable for data encryption and for secure direct-sequence (DS) spread-spectrum (SS) systems. We also describe the generation of code families with good auto- and cross-correlation properties, which make them suitable for secure code-division multiple-access (CDMA) systems. Although the generated codes appear to be random and enjoy most of the properties of random codes, they are deterministic. In other words, they can be exactly regenerated by fixing the parameters of the fuzzy random number generator.