Research On System Modes And Channel Estimation Technologies Of PCSS

Because of the high intelligence transmission efficiency, the low acquisition probability, therefore, the parallel combination wide frequency system has the strong burst correspondence and privacy communication ability. Time domain burst ability and the frequency range low power spectral density characteristic enables the parallel combination wide frequency correspondence to have the widespread application prospect in the military correspondence domain; At the same time, because its information loading capacity is greatly strengthened, to the channel environment request high characteristic, the parallel combination wide frequency correspondence is suitable for in the commercial optical fiber backbone network to carry on the high speed data transmission.This article take the parallel combination wide frequency communications system as the object of study, take the pseudo-random sequence selection technology, the digital modulation technology and the channel estimate technology as the research content, key has conducted the research to the below question.First of all, the union parallel combination wide frequency communications system's mathematical model, has inferred the pseudo-random sequence related characteristic and the parallel combination wide frequency communications system influence mathematical expression. Has analyzed the m_W serial correlation characteristic technology characteristic and the practical application limitation; Proposed the application complete supplementary sequence takes the parallel combination wide frequency communications system's pseudo-random sequence, proves its feasibility through the theoretical analysis and the software simulation.Secondly, in view of the different channel environment, has designed two kind of parallel combination wide frequency system entire digitization modulation scheme, namely is suitable for the stationary type fiber channel's entire digitized MASK modulation scheme, is suitable for the wireless fading channel's entire digitized MSK modulation scheme.Finally, take sharpens the parallel combination wide frequency communications system wireless channel environment adaptiveness as the goal, has carried out the channel estimate technology research; Proposed based on the continual pilot frequency's channel estimate plan, and has carried on the software simulation confirmation.