A novel method of designing chaotic spread-spectrum sequence based on combined Tent-map

This paper proposes a novel method of designing chaotic spread-spectrum sequence based on combined Tent-map. The presented combined sequence is almost uniformly distributed over (0, 1), while the traditional chaotic sequences are far away from uniform distribution. Computer experiments show that the combined chaotic sequences are capable of passing the strict Diehard randomness tests, which provides the evidence of their robustness in statistical properties.