1) Doppler shift
多普勒频偏
1.
Doppler shift estimation and pre-compensation of satellite communication;
卫星通信中多普勒频偏的预校正
2.
Several Doppler shift estimators, including mean logarithm envelope difference(MLED) method, auto-correlation function (ACF) method, zero crossing rate (ZCR) method and mean square phase difference (MSPD) method are discussed and compared.
针对几种多普勒频偏估计方法,分别为对数包络法、自相关函数法、各阶电平通过率法和均方相位差分法,在理论上分析了瑞利信道中它们的估计原理和估计偏差,说明了这些估计方法各自的适用场合。
3.
DFT-Code acquisition method can estimate Doppler shifts while searching PN phase.
DFT伪码捕获算法在进行伪码搜索的同时估计多普勒频偏,为了满足捕获精度要求,需要增加DFT点数,但随着运算点数的增加硬件实现难度成倍增长。
2) Doppler frequency offset
多普勒频偏
1.
Doppler frequency offset is always the passive factor that can t be neglected in satellite communication.
多普勒频偏一直是卫星通信中不可忽视的消极因素。
3) doppler-shift
多普勒频偏
1.
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.
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。
2.
The Doppler-shift of the time-varying multi-path channel can be estimated by calculating the level crossing rate (LCR) of the signal envelope of the channel coefficient estimates on the effective fingers.
利用有效到达径上信道估计值包络的电平通过率,估计出时变多径信道的多普勒频偏,并分析了影响该频偏估计的几个系统参数,得到了合适的系统参数选取原则。
3.
The characteristics of phase difference in the time-varying channel are analyzed, then the Doppler-shift of the time-varying multi-path channel is estimated by calculating the expectation of the square phase difference of the channel coefficients on the effective fingers.
分析了时变多径信道均方相位差分的统计特性,进而利用接收机有效到达径上信道参数的估计值,统计其相位差分的均方值,据此估计出时变多径信道的多普勒频偏。
4) Doppler frequency shift estimation
多普勒频偏估值
1.
This paper presents a new method for rapid Doppler frequency shift estimation andframe synchronization in HF burst-communication.
提出了一种短波突变通讯中快速多普勒频偏估值和帧同步的新方法。
5) Doppler frequency offset correction
多普勒频偏校正
1.
The solutions to Doppler frequency offset correction have been presented before.
在数字移动通信中，多普勒频偏是影响信道传输质量的主要因素之一，多普勒频偏校正问题也就成为近年来研究的热点。
补充资料：多普勒频移
多普勒频移
物理学术语。又称“多普勒频率”。由多普勒效应引起发射频率与运动目标反射波或散射波信号频率之间的频差。反射体引起的多普勒频移(fd)与发射频率(fs)的关系式为fd=(2Vcosθ)·fs，C为声速，V为反射体的运动速度，θ为反射体运动方向与声束指向之间的夹角。取超声诊断中的典型数据可算得血流。胎心检测中的多普勒频移(fd)均在声频范围之内，因此这类诊断仪器均可采用扬声器来监听。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条