Research On Interference Of Multi-Mode And Multi-Band LTE_Terminals

In recent years,the rapid development of mobile communication technology and application.With the development of wireless Internet technology,domestic and foreign operators are deploying 4G mobile communication network.Due to the current stage of development of mobile communications is still in the 2G,3G,4G coexistence.The GSM,WCDMA,TD-SCDMA and LTE all kinds of models are still in operate.Therefore,the terminal products,as mobile phones and PAD are moving toward Multi-Mode Multi-Band and Dual communication.The terminal of LTE Multi-Mode Multi-Band and Dual communication can meet to many requirement of end users in the network of differenct operators.The voice calls and high-speed data can be access simultaneously,and it to meet requirements of roaming and business.Although the terminal of LTE Multi-Mode Multi-Band and Dual communication can produce a very good commercial value,compatible with the needs of end users.But the attendant is a variety of Multi-Mode Multi-Band interference problem.Such as Mobile phones interference in the call and data access mode with WiFi,BT,GPS,LCD,Camera and other devices.So the interference cause call falling or blocking data transmission.Even the phone can not communicate to network.At present,the LTE Multi-Mode and Multi-Band dual communication terminal is SxLTE+DSDA mode.It has two RF module.A moudule work in GSM,WCDMA,TD-SCDMA,LTE network,support data and voice communication.Another RF module work in GSM network,only to support voice communication.When leaving the LTE network,the two RF modules work in the dual communication mode.Because this research on LTE Multi-Mode and Multi-Band dual communication has just started,so there is a lack of comprehensive and systermatic research on it interference.And there is no comprehensive solution for the design guide line.Therefore,this paper study the problem of LTE Multi-Mode Multi-Band and Dual communication.Firstly,This paper introduces the development status of LTE Multi-Mode and Multi-Band terminal,analyzes the market situation and the future development direction of the products.Throught the research and summary the interference problem and solution of LTE Multi-Mode Multi-Band and Dual communication in the Globe.So it is still in the initial stage that the interference research and solution of the LTE Multi-Mode Multi-Band and Dual communication.Throught analysis spectrum occupancy in the wireless communication of LTE Multi-Mode Multi-Band and Dual communication,classify to terminal of LTE Multi-mode Multi-band and Dual communication,and analysis the terminal architecture and key components.Then focus on the principle of terminal interference,Summarizes the terminal interference principle and solve method which Co-frequency and adjacent channel interference,intermoudulation interference,Jamming interference,reciprocal mixing interference and Harmonic interference.This paper focuses on the LTE Multi-Mode Multi-Band dual communication terminal.Whole terminal design and antenna design is carried out.Provide anti-interference design solution of the whole phone and itself ANT.And design schematic of RF front circuit of LTE Multi-Mode Multi-Band and Dual communication after interference scene was analyzed and interference intensity calculated.And design PCB layout after plan PCB stack and calculate impendance.At the end of this paper,provide terminal test method after analyze specification requirments of LTE Multi-Mode Multi-Band and Dual communication.At the same time,according to the specification requirments,release two proposal for terminal interference test that contrast to performance test in the shielding box and absolute to performance test in the OTA.And test product performance by the test.Finally,throught the terminal interference debug example for illustrate the terminal interference debug method to R&D engineers design reference.So that the mobile phone R&D engineers can clearly understand the design ideas and solutions of of LTE Multi-Mode Multi-Band and Dual communication.And the qualified products can be develop in the practical engineering application by Engnieer.