| CDMA信号前向链路频谱增生和邻道功率比估计 |
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| 引用本文： | 林茂六,杨智伟,许洪光.CDMA信号前向链路频谱增生和邻道功率比估计[J].重庆邮电学院学报(自然科学版),2005,17(1):1-5. |
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| 作者姓名： | 林茂六 杨智伟 许洪光 |
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| 作者单位： | 哈尔滨工业大学电子与通信工程系，哈尔滨工业大学电子与通信工程系，哈尔滨工业大学电子与通信工程系 黑龙江哈尔滨150001，黑龙江哈尔滨150001，黑龙江哈尔滨150001 |
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| 基金项目： | 国家自然科学基金资助项目(60372051)，武器装备预研基金资助项目(51487011504HT0101) |
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| 摘 要： | 利用幂级数和和高阶累计量的统计方法，估计出基于IS-95模型CDMA(码分多址)信号前向链路通过弱非线性RF功率放大器产生的频谱增生和邻道功率比的严谨表达式，由此获得了经该放大器特征模型变换的输出信号自相关函数的解析表达式。用三阶截断点IP3表征了包含带内和带外电抗的记忆效应三阶非线性。估计方法是基于CDMA信号前向链路时域模型，其信号的功率谱密度和其他统计特性均由该模型导出。频谱增生和邻道功率比的估计结果可直接用于工程设计，这对于确定射频功率放大器最佳的工作条件有其重要参考价值。
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| 关 键 词： | 频谱增生 邻道功率比 CDMA 功率谱密度 自相关函数 高阶累计量 |
Analysis of a forward link CDMA signal spectral regrowth and adjacent-channel power ratio |
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| LIN Mao-liu,YANG Zhi-wei,XU Hong-guang.Analysis of a forward link CDMA signal spectral regrowth and adjacent-channel power ratio[J].Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition),2005,17(1):1-5. |
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| Authors: | LIN Mao-liu YANG Zhi-wei XU Hong-guang |
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| Abstract: | Closed-form expressions for the spectral regrowth and ACPR of CDMA signal passed through a nonlinear amplifier by a digitally modulated carrier are derived using the power series and statistical methods of high order cumulant. The technique yields an analytical expression for the autocorrelation function of the output signal as a function of the statistics of the input signal transformed by a behavioral model of the amplifier. The third-order nonlinearity is expressed in terms of IP_3 to include the memory effects of the circuit in-band and out-of-band reactance. The analysis is based on a time-domain model of the signal and the model is used to derive the power spectrum density and other statistical properties of the CDMA signal. Such analytical results are useful in finding optimal operating conditions of the RF power amplifier. |
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| Keywords: | spectral regrowth ACPR CDMA power spectrum density auto-relation function high order cumulant |
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