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首页> 外文会议>31st AIAA international communications satellite systems conference >CHARACTERISATION OF NONLINEARITY AND INTERMODULATION DISTORTION IN C- KU-BAND SATELLITE TRASPONDERS
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CHARACTERISATION OF NONLINEARITY AND INTERMODULATION DISTORTION IN C- KU-BAND SATELLITE TRASPONDERS

机译：C和KU波段卫星应答器的非线性和互调失真的表征

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Knowledge of the levels of harmonic and intermodulation products (IMP) created by a nonlinear system is important in order to assess the quality of service in adjacent channels, an assessment that requires estimation of the ratio between wanted signal power and the sum of all noise and interference within the channel. Nonlinearity in transmission channels arises predominantly due to high power amplification using active devices. A prime example is the transparent satellite transponder, the focus of this paper, which performs operations of RF signal reception, frequency downconversion and high power amplification. Based on measurements of transponder performance at C-band and Ku-band it is shown that the AM/AM transfer characteristic is accurately represented by a 7th order polynomial of odd powers in the region up to 20% above the input saturation voltage. Using this model an exhaustive analysis of multicarrier operation was carried out leading to a simple analytic expression for output signal and IMP power, and hence carrier to intermodulation power ratio (C/I) in the case of a two-carrier operation (i.e. number carriers r = 2). For r ≥ 3, the classes of IMPs increase up to a maximum of 24 and expressions are tabulated for the amplitude of each class of IMP in terms of the transfer characterisitic polynomial coefficients. Although the number of IMPs increases very rapidly with the number of carriers r, the transponder's C/I approaches a limiting value at r ＞～ 12 for any given input power backoff from saturation (IBO). The results of this paper should facilitate simple estimates of C/I ratio in multicarrier operation of nonlinear transponders without the need for time consuming simulations.
机译：为了评估相邻信道的服务质量，了解非线性系统产生的谐波和互调产物（IMP）的水平非常重要，这种评估需要估计所需信号功率与所有噪声和的总和之比。通道内的干扰。传输通道中的非线性主要是由于使用有源器件的高功率放大引起的。一个主要的例子是透明卫星转发器，它是本文的重点，它执行射频信号接收，频率下变频和高功率放大的操作。根据在C频段和Ku频段的应答器性能测量结果，可以看出AM / AM传输特性可以由高于输入饱和电压20％的区域中的奇数功率的7阶多项式准确表示。使用该模型，对多载波操作进行了详尽的分析，从而得出了输出信号和IMP功率的简单解析表达式，从而在两载波操作（即，数字载波）的情况下得出了载波与互调功率之比（C / I） r = 2）。当r≥3时，IMP的类别最多增加到24个，并且根据传递特征多项式系数，将每类IMP的振幅列表成表。尽管IMP的数量随着载波数量r的增加而迅速增加，但是对于任何给定的输入功率饱和（IBO），应答器的C / I在r＞〜12时都接近极限值。本文的结果应有助于简单地估计非线性应答器在多载波操作中的C / I比，而无需进行耗时的仿真。

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