Design And Application Of A Special Spread Spectrum Sequences

With widely application of wireless communication, the key technologies of wireless communication systems have been more concerned by people, and the research on code sequences is an important part of the technology of wireless communication. Study on code sequences focuses on the generating method and correlation of code sequences. Study on smart code is an important branch of the code sequences research. There are various methods of generating code sequences which apply to different fields accordingly. As manifested by experiments, Bridge functions could apply to communication system, but their usage is constrained because of too many zeroes in the sequences. In order to resolve this problem, this paper gave a new generating method based on Bridge functions and hybrid Bridge functions.This paper fully studied the nature of the Bridge function sequences generated by the binary code for the copying information and shifting information and the correlation function theory in earlier stage. A new kind of functions-Hybrid Bridge functions-is constructed based on the Hybrid matrix, of which the row vectors are taken from the row vectors of Walsh function matrix and Bridge function matrix. The method is using the column vectors of intercross Bridge function as a new function sequence. This function sequences break the restraints of the number of zero elements in the bridge sequence, and composites the respective advantages of Walsh function sequences and the Bridge function sequences, greatly widens the research field of the function sequence, and further improves and develops the copying theory and the bridge function theory system. This paper will deeply study the nature of hybrid Bridge functions and correlation function theory. On the basis of all these work, we will explore and generate new hybrid Bridge function, and study the nature and correlation function, search for a class of a certain number of the hybrid Bridge sequences that have good correlation characteristics, and further explore the application of making use of them as spread spectrum sequence in wireless communication systems.