Differential Frequency Hopping Communication System, Multi-user Technology

The High Frequency Differential Frequency Hopping(DFH) technology, used in the CHESS communications system, combines modulation, encoding and frequency hopping technology organically. DFH enormously improves the data transmission capacity, anti-interference and anti-fading ability of the communication system represents the research direction of new generation HF anti-jamming communication scheme.Almost researches, which have been on DFH, are restricted to the area of singe-user algorithms. A few of them are focused on the subject of multi-user communication.This thesis briefly introduces developments of high frequency hopping communication and domestic and overseas current research. It describes the DFH communications system overall framework in detail. The thesis proposes a kind of multi-user G function. Performance is investigated and simulation results are provided to show the method's good.Usually, information rates of different users are different in communications networks. To support different information rates and maintain the performance of every single user's communication, Block Frequency Hopping (BFH) technology is proposed.Finally, the thesis summarizes the work of this thesis, and proposes the work to be continued.