Research On Some Key Technologies Of 5G Multichannel Wireless Line

The wave of mobile Internet is in the ascendant,subverting the traditional mobile communication business model and promoting the continuous transformation of mobile communication technology.The influence of the fourth generation mobile communication technology(4G)such as large capacity and high speed on the communication industry is continuing.Meanwhile,the fifth generation mobile communication technology(5G)has already become the core driving point of the new round of mobile communication technology transformation.As the 5G spectrum of 3GHz~6GHz is delimited,it is planned to have a spectrum resource of 199 MHz bandwidth between the 4.8GHz~4.99 GHz bands.The RF front-end of the traditional RF transceiver has high radio frequency performance,but its fixed communication links greatly affects the flexibility of the communication system.The software radio technology is introduced,which can combine the flexibility and openness of the software radio with the high performance of the RF front end.In this paper,a variety of link schemes are analyzed and compared from the basic wireless link,and a multichannel wireless link is designed by the zero IF scheme.Then,a multichannel wireless system platform based on AD936 X is designed and implemented according to the key theory and technology problems of multi-channel.The working frequency is 4.8GHz~4.95 GHz.The platform consists of high performance RF front-end and flexible configurable modules.Then the control scheme of the wireless link is designed.Finally,the hardware comprehensive test is carried out to verify the function and performance of the wireless link.The platform has multiple features:(1)High sensitivity,gain large dynamic range receiving link;(2)Amplitude phase conformance circuit structure under large dynamic conditions;(3)high restraint outside the band of receiving channel;(4)Modular high performance RF front-end + reconfigurable transceiver chip architecture;(5)Improving transceiver isolation based on RF+ digital baseband.It is of great value and significance for the present and subsequent radio frequency links and related 5G technology research.