If Receiver System Based On The The Linc Feedback Structure Of The Design And Implementation

Recently, wireless communication is the fastest growing and most widely used technology in the field of information and communication. Broadband digital transmission technology and high spectral efficiency modulation methods came into being with the proliferation of mobile users as well as the development of multimedia business . Transmitter is required to maintain a strict linearization under the high-power condition. The current amplifier linearization technologies are power back-off method, feed-forward method, pre-distortion method, the feedback law, as well as LInear amplification using Nonlinear Components(LINC) which are developed recently. LINC technology has overcome the shortcoming such as Low efficiency and narrow-bandwidth which are produced by conventional linearization method. LINC Transmitter's efficiency can achieve 100% in the ideal circumstances, while maintaining high linearity. The study of LINC transmitter has quickly become a new hot spot in the field of wireless communication both at home and abroad.This work was supported by the Hi-tech Research and Development Program of China. Firstly, key technologies and research background of LINC are introduced. Then the affect which is made from gain-phase imbalance in the LINC system is explained. Moreover, feedback structure is analyzed significantly. The design of IF receiver system based on the feedback structure of LINC has been proposed.Task completed in this subject:1,Based on the intensively study of IF receiver, Total design Solution are designed according to the requirement of feedback correction algorithm of LINC system. ADS and MATLAB are used to modeling and simulation for the overall system, analyze and confirm design proposal's feasibility;2,Design and realization for IF receive system have been researched, based on the structure and the characteristic of Field Programmable Gate Array (FPGA). Verilog HDL language is adopted for programming on QUARTUSII software platform. Sub-module design of the whole system has been made;3,After ADC configuring by DSP, downloading-confirmation is carried on.Results have been validated by joint simulation system (QUARTUS and MATLAB). System design solution has been verified through analyzing the results obtained from spectrum analyzer. Through analysis, it showed that the design solution is correct which can satisfy the indicator's requirement of feedback correction algorithm.