Research On The Linearization Technology Of The High Speed Digital Transmision On The Satellite

With the data obtained by domestic and foreign remote sensing satellites and payload technology leaps and bounds,the research of solving linear and nonlinear distortion in RF channel is more and more important in the field.In the paper,We research the compensate techniques of linear and nonlinear distortion in RF channel based on transceiver devices of 750 Mbps base-band and bit rates in 1.2Gbps~2.5Gbps,with the modern modulation 8PSK?16QAM?32APSK applied in the current high-speed data transmission system.First of all,the thesis introduced and analyzed the main design requirement of distort compensate techniques in RF channel based on space borne high-speed data transmission.Secondly,the thesis improved a modified nonlinear distortion compensate scheme after analyzing and comparing the simulation results between linear and nonlinear distortion compensate algorithm with MATLAB.Thirdly,we build up a test platform of transmit-receive system to compensate the linear and nonlinear distortion in RF channel of satellite;Then,after comparing and analyzing the simulation results between linear and nonlinear distortion compensate algorithm base on FPGA,we improved a associated scheme to solve the distortion problem,evaluated the usage of resource and simulated the performance.Finally,we tested and analyzed the distort compensate hardware platform we build;The algorithm simulation and test results verified that the proposed compensate algorithms of linear and nonlinear distortion can effectively improved the RF channel linearization level,and greatly improved the signal quality in space borne data transmission with Wide-band digital signal and high-level modulation,finally satisfied the system design requirement.