Ffh System Under Multi-tone Interference Sub-collection And Technical Studies,

Fast Frequency Hopping(FFH) is an important communication anti-jamming technology, which is employed extensively in both military and commercial areas.Diversity combining technologies are one of key techniques of FFH systems. Diversity combining could improve performances of anti-interfering and anti-fading in an FFH system.FFH single-user diversity combining technologies under aiming MTJ or unaiming MTJ are key issues in this dissertation. FFH multi-user diversity combining technologies have been subjected to intensive study.Chapter one introduces FFH communication's principles, explain the concept of aiming MTJ and unaiming MTJ, and advances the improtance of investigating on FFH diversity combining technologies under MTJ.Chapter two introduces the basic principles and receivers'block diagrams of five primary diversity combining technologies.Chapter three mainly studies the simulation analysis of FFH single-user diversity combining arithmetics under aiming MTJ when desired signals undergo a no fading, rician fading or rayleigh fading process.Chapter four examine FFH single-user diversity combining arithmetics under unaiming MTJ and theoretical formulae are developed. Both the theoretical analysis and computer simulation show unaiming MTJ is an effective way by the jammer to combat the diversity combining technologies used by the communication side when desired signals undergo a no fading process.Chapter five pays attention to performances of multi-user diversity combining arithmetics and the impact of MAI to the system's performance is analyzed.Chapter six is the conclusion of this dissertation.