Research And Implementation Of Hybrid Spread Spectrum (HSST) Communication System

Frequency hopping communication has great advantage compared with other communication systems, most of all is its anti-jamming function. Besides above, frequency hopping communication has the ability of Code Division Multiple Access (CDMA) and frequency diversity functions etc. As the hot spot of modern communication system, it will be the trend of communication system in the next few years.Firstly, in the second chapter the thesis raises the mathematical model of frequency hopping communication. Thorough mathematical analysis, tell us why thers is so much great advantage. Then, the thesis points out that only we come the four points out successfully that the communication system will come to synchronization. There are three key technology to frequency hopping communication, the design of frequency synthesizer, the design of Frequency Hop (FH) pattern and Frequency Hop Synchronization (FHS). In the design of m seqence, the thesis not only gives more details about it, but also gives the codes that used in practical application.Then in the fourth chapter named research and implementation of the way to capture the signal, thesis gives three main searching acquisition methods that includes serial acquisition and parallel acquisition, not only gives the system block diagram, but also gives the differences between them. At the last of the chapter, the thesis gives own way to capture the signal, synchronization acquisition based on mached filter, the thesis focus on the realization of the mached filter, at the end of the chapter gives more results about the simulation.FHS include FH pattern synchronization, signal carrier synchronization, bit synchronization and frame synchronization. In the chapter five named research and implementation of synchronized method, the thesis introduces two main methods:self-synchronizing method and other synchronizing method. Based on these methods, combined with the practical experience, the thesis gives a method that mixed with reference clock wih synchronous injured-dedicated method and self-synchronizing method. At the end of the chapter the thesis gives two different plans about timing recovery and a method of frame synchronization.At last, the thesis introduces the hardware platform used in the post project and software environment, expecially the code. Based on it, the thesis gives the code of modules that used in the project. For example, CRC module, framing module etc. At the end of the chapter gives the result of the simulation.At the end, the thesis gives a summary to the artical and look in the distance about the technology in the future.