NHZ FH Sequence Design And System Simulation Investigation

The frequency hopping (FH) communication is widely applied in modern military and civil communications because of its advantages such as anti-jamming, anti-fade, anti-capturing, and multi-access networking etc. Frequency hopper is the key for the FH communication system, while networking is the key for the FH communications to be working properly in the FH system. The No-Hit-Zone (NHZ) hopping code is employed by the frequency hopper of NHZ FH communication systems, which have no hits at all within a predefined correlation zone in the vicinity of zero shift. Since the multi-access interference can be greatly decreased by NHZ code, the quasi-synchronous multiple access scheme is suitable for NHZ FH communications systems.This thesis can be divided into three parts. Firstly, a new structure of NHZ hopping code based on interleave technique is proposed. In this part, the conception of NHZ hopping code and interleave technique are introduced. Then the construction of NHZ hopping code based on interleave technique is presented in details.Secondly, a new quasi-synchronous multiple access scheme based on clock synchronization, which is suitable for NHZ FH communication systems, is put forward. In this part, the principle of multi-access networking is summarized. Then the quasi-synchronous scheme based on synchronous head and self-synchronization is introduced, which is designed by Feng et al. And a new quasi-synchronous multiple access scheme based on clock synchronization is put forward. By comparing these two schemes, it is shown that the new quasi-synchronous multiple access scheme based on clock synchronization is preferable because of its higher speed and less system resource.Thirdly, a simulation platform for NHZ FH communication...