摘要
基于CDMA信号的统计特性,利用幂级数和高阶累积量的统计方法,推导出CDMA信号通过射频非线性功率放大器后产生的线性输出功率、三阶截断点和五阶截断点表示的功率谱密度表达式。利用该表达式定量分析了由该功放引起的频谱增生和邻道功率比。根据对理论推导算法进行仿真并与TYCO-Q588功放测试的实验结果进行比较,以验证其正确性。最后与只考虑三阶失真的仿真结果进行了比较,说明了该算法的优越性。
Closed-form expressions for the spectral regrowth of CDMA signal passed through a nonlinear amplifier are derived using the power series and high-order cumulant based on statistical methods.The technique yields the power spectrum density of output signal including linear output power,the third-order intercept point and fifth-order intercept point.Using this expression,the spectral regrowth and adjacent-channel power ratio caused by amplifier is analyzed quantitatively.Comparison between the simulation result and the experimental results of TYCO-Q588 amplifier confirms correctness of the algorithm.Finally,the results show that the analysis method using both third-order and fifth-order intercept point fits the actual process better.
出处
《电路与系统学报》
CSCD
北大核心
2011年第2期28-33,共6页
Journal of Circuits and Systems
基金
黑龙江省教育厅科学技术研究项目(11541302)
国家自然科学基金资助项目(60772078)
关键词
功率放大器
非线性
功率谱密度
高阶累积量
power amplifier
non-linear
power spectrum density
high-order cumulant
