Ultra-wideband Orbital Angular Momentum Channel Modeling And Receiving Technologies

With the rapid development of wireless communication technology, bandwidth efficiency and channel capacity has been gradually approaching the Shannon limit, communication research has been seeking ways to enhance a greater degree of spectral efficiency. In terms of spectrum efficiency, polarization multiplexing, orthogonal frequency division multiplexing technology has become more sophisticated, the orbital angular momentum as a new technology has been widely used in academic circles, with efficient spectrum utilization and performance, the track angle momentum has become a hot topic of electromagnetic fields and the field of communications. For ultra-wideband technology, UWB technology over the past few decades, although still limited to military communications and radar remote sensing, due to its large capacity, fast transfer rate of features, making it become to the focus of research short-range high-speed wireless communication system, known under generation wireless communications one of the key technologies.In this paper, by combining orbital angular momentum with the ultra-wideband technology, we designed a circular array antenna, using L probe, and the better signal band widening, which can successful producing OAM ultra-wideband signals, this is about the antenna structure design, simulation, and for the orbital angular momentum of ultra-wideband signals, and foresees the development trends in this field. At the same time, using MATLAB to carry on the channel modeling of the ultra wide band signal with rotating factor, and discuss the impulse response and the distribution of the maximum time delay and the distribution of the different OAM modes of ultra wide band UWB channel. Based on the research of ultra wideband channel, several important ultra wideband RAKE receivers are studied, and combine the RAKE receiver and ultra wideband OAM signal, and performance simulation of S-RAKE, P-RAKE and A-RAKE signals with rotating factor, analyze the simulation results of three kinds of receivers in different modes.