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- But there are a lot of questions in DS-CDMA satellite communication system, such as the fading of received signal, the multiple access interference (MAI), large Doppler frequency offset, the CW and narrow band interferences in channel and so on. 但是,在DS-CDMA小卫星通信系统中,亦存在如下问题:如接收信号的衰落、多址干扰(MAI) 、大的多普勒频移、信道中的连续波(CW)及窄带干扰等。
- The Research on the Algorithm of Dealing with Doppler Frequency Offset 关于克服多普勒频移的地址码捕获算法研究
- Real-time Estimation of Doppler Frequency Offset in LEO Mobile Satellite Communication 低轨卫星的多普勒频移实时估计
- Doppler frequency offset 多普勒频移
- The ways of estimating the frequency offset and Doppler spread width in WCDMA system are studied in this paper. 本文主要研究了WCDMA(宽带码分多址)系统中频偏和最大多普勒频偏的估计方法。
- Carrier frequency offset is one of the key problems in OFDM system. 摘要载波频率偏移是OFDM系统实现的关键问题之一。
- The doppler frequency is a function of the two scattering directions. 多普勒频率是两个散射方向的函数。
- The results indicate that frequency offset can be obtained robustly. 海量实验数据证明,对应的数据是鲁棒的。
- The Doppler frequency can be obtained as a heterodyne or beat effect. 由于外差或频差效应,能够得到多普勒频率。
- The simulation for QPSK shows that the algorithm can estimate the carrier phase and frequency offset accurately and reduce the system BER effectively. 结果表明,用该算法可以精确估计载波相位和频差,有效地降低系统的误码率。
- With the high frequency, it can get great Doppler frequency which bepropitioustomeasure slow velocity. 其频率高,可获得更大的多普勒频率,更有利于慢速目标的检测;
- It has previously been shown that PCC substantially reduces the sensitivity of OFDM to carrier frequency offset. PCC能够显著地降低OFDM对载波频偏的敏感性。
- A new technique to estimate the Doppler frequency rate is proposed with high accuracy and low computation complexity. 本文提出了估算多普勒调频率的一种新方法,其精度高、计算量少。
- A novel scheme of estimating the carrier frequency offset in CDMA system with the continuous pilot channel is proposed. 摘要本文针对存在载频频偏的CDMA系统,提出了一种新的估计该固有频偏的方法。
- According to the laser gain change is linear related to the frequency shift, the Doppler frequency is extracted by the signal processing. 根据激光的增益变化和频率变化成线性关系,可以对信号进行处理求出多普勒频移。
- A new frequency offset and channel estimation joint algorithm for OFDM system is proposed. 摘要针对正交频分复用系统提出一种新的频偏与信道联合估计的算法。
- This algorithm has small computation amount load and has high estimation precision of doppler frequency rata-of-change. 算法具有计算量小、多普勒频率变化率估计精度高的优点。
- Based on the fixed sampling interval technique, an improved phasor computing algorithm is proposed to correct the errors caused by DFT in the presence of frequency offset. 推导出一种在定间隔采样基础上能够有效消除非额定频率下离散傅里叶变换(DFT)算法产生的频率泄漏影响的相量校正算法。
- Then the phase trajectory is estimated based on MMSE criterion, and the frequency offset and initial phase can be achieved. 在此基础上,基于MMSE准则计算载波相位的轨迹,得到频差和初始相位。
- The arithmetic of target motion analysis is studied in this paper by means of Doppler frequency and bearing in Cartesian coordinates. 摘要研究一种在直角坐标系下利用多卜勒频率和方位信息的目标运动分析算法。
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