摘要
仿真无线时变信道的衰落特性常常需要具有一定功率谱形状的色高斯噪声信号。本文推导了无线信道快衰落特性的功率谱及其受限功率谱,分析了宽带高斯过程的谱特性和时间相关性,同时考察了具有高斯功率谱形状的信道阴影慢衰落的特性。通过有限正弦信号叠加近似生成了宽带色高斯噪声信号,确定了正弦分量的多普勒频率和多普勒系数。
The colored gauss noises (CGN) with deterministic power spectrum shapes are usually used to simulate the fading characteristics of wireless channels. The power spectral density (PSD) and its restricted form for radio channel suffering the fast fading is discussed and the spectral specialty and auto-correlation function of the wide band gauss process are analyzed. The time correlation of the shadowing channels with slow fading characteristics are also investigated. The wide band CGNs are approximately generated by means of finite sums of properly weighted sinusoids with uniformly distributed phases, and the Doppler parameters including the Doppler frequencies and Doppler coefficients are determined.
出处
《电路与系统学报》
CSCD
2001年第4期11-14,共4页
Journal of Circuits and Systems
基金
重庆市科技攻关项目资助
关键词
高斯色噪声
功率谱
信号谱特性
CGN
Power spectrum
Doppler
Generation
Radio channels
