The Wireless FM Digital Relay System Based On SoC Design And Research

Software Defined Radio is a kind of Radio communication technology, is a kind of wireless communication protocol based on Software definition.In constructing a frequency, mode and multi-function wireless communications equipment on the issue of software radio provides an efficient and safe solution.With the rapid development of wireless communication and chip technology, the concept of software radio began to widely popular.But the SDR on software and hardware processing need extremely high speed performance, so pure SDR is not widely used in the actual product.AD9361 radio frequency agile transceivers adopted in this paper, in the real meaning in the SDR concept is widely applied in the actual product.This paper set up by the agility of the radio frequency transceiver AD9361 and ZYNQ on-chip system of software radio transceiver.Allow them to receive FM radio signals, the rf signal into the digital intermediate frequency signal processing, and then the processed signal to launch.Conducted by the same transceiver receive next, thus formed a wireless digital relay system.The system can realize the FM radio signal blind area coverage.Wireless digital relay is traditional communications system frequency change is implemented using analog circuit, signal processing is done by the hardware circuit, and the radio system based on SoC technology by the method of software and hardware coordination design, make it easier for the system performance to meet user needs, with better flexibility and generality, than wired FM radio transmission mode,network flexibility, high transmission quality, the advantages of the blind area covering effect is good.Wireless FM digital relay system consists of a number of software radio transceiver unit into a letter, between each other through wireless transmission signal.Because the on-chip system ofreceiving antenna and transmitting antenna distance closer, emission signal is coupled to the receiver with the original radio signal is received, self-excited phenomenon, make the whole system can’t work normally.Therefore, how to realize the signal reception and transmitting of distinction, this is the system in one of the major problems faced in the practical application.Feasibility scheme: this paper puts forward three kinds of cable transmission technology, adaptive filtering technology and digital frequency conversion technology.And the cable transmission technology and digital frequency conversion technology is verified, combining the characteristics of the transceiver itself, determine the digital frequency conversion technology,can effectively solve the self-excited phenomenon encountered in actual application.In software radio transceiver, digital up converter is located in the high speed A/D, D/A and A baseband signal processing module between key digital signal processing module.This topic USES the thought of software radio, and modular design concept, using the advanced model oriented development tools, using a high speed digital transceiver based on software radio in the upper and lower frequency conversion technology, the wireless FM digital frequency conversion,signal processing, realize the spectrum shift, solve the interference between sending and receiving signals.