Orthogonal twelve-phase sequence sets design

Multiple radar system and spread spectrum communication system can fundamentally improve the system performance by using a group of specially designed orthogonal signals. A Modified Simulated Annealing Algorithm (MSAA) is used as a statistical technique for obtaining approximate solutions to combinatorial optimization problems. The MSAA is a combination of Simulated Annealing and Hamming Scan algorithms. It is used to design orthogonal twelve-phase sequence sets, which have good autocorrelation and crosscorrelation properties. Some of the synthesized results are presented, and their properties are better than four-phase sequence sets known in the literature. The synthesized twelve-phase sequence sets are promising for practical application to multiple radar system and spread spectrum communication. The convergence rate of the algorithm is shown to be good.