【摘要】 时变多径信道的多普勒频偏可以利用有效到达径上信道包络的电平通过率进行估计,而可靠的估计需要足够长的观察时间长度和较大的存储量,文章利用一阶自回归滤波器进行改进,从而使得通信系统在各种移动速度和信噪比下,都能在较短的观察时间长度内以较小的存储量得到可靠的多普勒频偏估计值。更多还原

【Abstract】 The doppler-shift of the time-varying multi-path channel was estimated by calculating the level crossing rate (LCR) of the signal envelope of the channel coefficient estimates on the effective fingers. Because of the needed long observation time and large storage, we recommend to use the 1st order autoregressive(AR(1)) filter to shorten the observation time and storage requirement, and the estimation accuracy is guaranteed at the same time .更多还原