摘要
提出了一种基于相位平滑改善信号频谱特性的新方法。为了加快连续相位调制信号的频谱滚降速度,引入了一种多项式函数来控制调制信号的相位变化轨迹。分析了该函数模型建立条件,根据相位平滑边界条件对函数进行了求解,设计了调制方案,仿真了基带信号的归一化功率谱,结果表明:相对于传统模式,该方法所得信号的相位变化轨迹更加平滑,带外能量辐射小。
A method to improve signal spectrum properties based on phase smoothing is proposed. In order to speed up the spec- trum roll-off rate of continuous phase modulation signals, a polynomial function is introduced to control trajectory change of the phase modulated signal. Conditions of the function model are analyzed. Solutions of the function are provided according to phase smoothing border conditions. Modulation scheme is designed. Normalized power spectrum of baseband signal is simulated. Results show that this approach,compared with traditional approaches,provides a smoother signal phase trajectory and low outband energy radiation.
出处
《无线电工程》
2013年第4期24-27,共4页
Radio Engineering
关键词
连续相位
平滑相位
功率谱
多项式
continuous phase
smooth phase
power spectrum
polynomial
