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1)  Sampling frequency offset
采样频偏
1.
In this paper, the sensitivity of sampling frequency offset in orthogonal frequency division MB-OFDM-UWB system is analyzed.
本文分析了MB-OFDM-UWB系统中采样频偏对系统性能的影响,进一步推导出存在采样频偏时接收端符号相位旋转的公式,结果表明,MB-OFDM-UWB系统中采样频偏对系统的影响不仅与 MB-OFDM-UWB数据帧的符号个数、子载波数相关,而且与循环前缀长度有关。
2)  sample frequency offset
采样钟频率偏移
1.
The effect of sample frequency offset was exploited on multi-input multi-output orthogonal frequency-division multiplexing(MIMO-OFDM) signals.
分析了采样钟频率偏移对MIMO-OFDM系统接收信号的影响,提出了一种适用于MIMO-OFDM系统的采样钟频率偏移估计算法,即幅度加权最小平方估计法。
2.
An efficient, accurate, hardware-based method realized via FPGA was proposed to dissolve the problems of integer frequency offset, fraction frequency offset, sample frequency offset and timing offset in OFDM system, etc.
针对OFDM系统频域中的整数倍频率偏移、小数倍频率偏移、采样钟频率偏移和定时偏移等问题,本文提出了相应的解决方案,并采用FPGA对各方法进行硬件电路实现。
3)  sampling frequency offset
采样频率偏差
1.
By adopting code rate as timing benchmark,the code tracking loop in the receiver tracks and calculates the sampling frequency offset between the actual and nominal values.
为避免采样频率偏差给卫星导航接收机带来的符号位滑动、伪随机噪声码相位移动和载波相位偏差等问题,提出了一种改进的频率偏差估计方法。
2.
The sample timing error and sampling frequency offset are analyzed respectively in detail by the digital model.
针对采样时钟同步偏差对正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统的影响,建立了数学模型,分别就采样定时偏差和采样频率偏差的影响进行详细分析;经过仿真,从星座图、误码率(Bit-Error-Rate,BER)及信噪比(Signal-to-Noise Ratio,SNR)损失等角度对采样频率偏差的影响做了揭示和验证。
3.
Compared with original time domain phase detector,the improved one is self-normalized and bears sampling frequency offset up to ±90ppm,three times as much as the former method.
该方案采用全数字延迟锁定环来跟踪定时误差,与传统的时域鉴相器相比,本文提出的鉴相算法能实现增益的自动归一化,且捕获范围为原算法的三倍,能纠正采样频率偏差达到±90ppm。
4)  sampling frequency tracking
采样频偏跟踪
5)  sampling clock frequency offset
采样时钟频率偏差
1.
Three different sampling clock frequency offset and residual frequency offset estimation methods were developed to improve their estimation accuracy in internet protocol-orthogonal frequency division multiple access(IP-OFDMA)system,and the characteristics of the pilot structure in IP-OFDMA system was considered.
为提高基于网络协议的正交频分多址(IP-OFDMA)系统中采样时钟频率偏差与残余频偏的估计精度,结合IP-OFDMA的自身导频结构特点,对经典估计方法进行改进,提出3种不同采样时钟频率偏差与残余频偏的估计方法。
6)  sampling time offset
采样时偏
1.
This paper presents a new method for joint estimation of carrier frequency offset and sampling time offset based on the recursive least-square(RLS)algorithm for OFDM systems in the tracking mode.
针对OFDM载波频偏与采样时偏的联合估计问题,提出了一种基于递推最小二乘(RLS)算法的新方法。
补充资料:被动式大气采样器
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性质:无需动力,通过气体扩散采集气体污染物的一种采样装置。该采样品是根据气体扩散原理和选择吸收的特点设计而成的。其结构由三部分构成(见图示)。A:上盖。上面放置浸渍采样膜。B:圆环。为气体扩散通道;C:带孔下盖。放不锈钢网和聚四氟乙烯微孔滤膜。整个采样器可放入筒状套匣,作为贮备容器。适用于各种场所的空气监测之用;尤其在无动力供给的边远、山岭地区更为适用。采样周期可长达1~2个月。所得污染物为在采样时间区段内空气中的平均浓度。

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