The Research Of Multiphase Orthogonal Sequence And Complete Complementary Sequence

In the recent 20 years, CDMA communication system develops very fast because spread spectrum communication has the characteristics of saving spectrum resource ,having ideal anti-jamming and secrecy. Spread spectrum communication has become the mainstream of the development of today's communication. However, in CDMA communication system, the choice of address code is very importance. It decides the capability, anti-jamming and speed of connect and conversion of the system.Today, in CDMA communication system, we use duality sequence as address code. People have deep and wide research in duality sequence. With the use of recent century algebra, people get a lot of duality sequences such as GMW sequence, No sequence, Bent sequence and so on. Although the construction methods of duality sequence have their excellences, they have limit. For example, there are few number of address code, and the improved degree of correlation is near to zero. Therefore, the duality sequence can not satisfy the demand of users and adapt the increase of user. In order to break through this limit, the research of multiphase has aroused the attention of scholars. One of the multiphase sequence construction method is advanced by Suehiro. The method is based on FH sequence and matrix. We can get more address codes and the correlation of the code is excellent. This make the research of address code in CDMA communication has a wide future.This paper is based on the construction theory of multiphase sequence. We research and simulate the correlation of multiphase sequence. Then we will compare with duality sequence in several guidelines. We can prove multiphase sequence is more stabilization and has good anti-jamming ability.The require of address code in project is that the sequence has acuity auto-correlation and the cross-correlation is near to zero. We research the complete complementary in this paper which has ideal cross-correlation. This paper also improve the construction of complete complementary and make the sequences are produced more easily. In the last, we search the 4-phase complete complementary.Finally, this paper point out the shortcomings and main direction of research in the future.3...