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Research on Compensation Techniques of Nonlinear Satellite Channel

Author: ZhangXiaoJuan
Tutor: WuChangQi
School: Yanshan University
Course: Communication and Information System
Keywords: Satellite channel Nonlinear compensation Group delay distortion Baseband predistortion Volterra equalizer Blind equalizer
CLC: TN927.2
Type: Master's thesis
Year: 2010
Downloads: 105
Quote: 2
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Abstract


In satellite communication systems in high-speed data , the nonlinearity of the transmission channel is an important factor affecting system performance . Channel nonlinear generation comes mainly from : RF end satellite communication system and satellite transponder high - power amplifier non - linearity ; channel fading and distortion caused by the group delay distortion . Predistortion and equalization techniques are the nonlinear effective measures of compensation channel . Nonlinear compensation technology for satellite channel , the paper mainly achieved the following : First, the review of high - power amplifier amplitude - phase model and the orthogonal model ; finite impulse response filter to model the channel group delay distortion : according to the group delay distortion index , the use of the formula method and frequency domain sampling of two filter design theory , linear group delay distortion and parabolic group delay distortion filter coefficients , focus on the design parameters selected design Results . Secondly , for 16APSK constellation optimization to find an efficient optimization criteria ; nonlinear high power amplifier , the introduction of fixed-point iteration method - based adaptive baseband predistortion algorithm : non-linear predistortion lookup table the optimal value of solving as equation Root problem , the use of the contraction mapping principle , entries updated as fixed-point iteration , using the Steffensen acceleration technology to improve speed of iterative . Then , the shortcomings of slow convergence of Volterra equalizer adaptive process , the weight coefficients of the application variable step size in the frequency domain LMS algorithm Volterra equalizer adaptive update to compensate for the power amplifier nonlinear distortion . Compared with the fixed-step time-domain algorithm , frequency domain algorithm makes use of the orthogonal transformation to reduce the input sequence , while dynamically adjust the step size to improve the speed of convergence of the equalizer . Finally, the combination of constant modulus algorithm ability to open the channel eye diagram ; decision-making point algorithm converges fast , low steady-state error ; normalized LMS algorithm dynamically adjusts the step factor to improve the convergence speed advantages , the establishment of a normalized a weighted dual-mode blind equalization algorithm to compensate for the channel group delay distortion . The weighted algorithm does not need to switch between the two modes and reduce the complexity of the receiving apparatus , and can improve the stability of the dual-mode algorithm .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Satellite Communications and Space Communications > Satellite Communications
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