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reference carrier
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  参考载波
     The result shows that 45° rotationally invariancc can be easily reached by differential coding and decoding, and can overcome the impairment of multiple phase ambiguities of reference carrier.
     结果表明,通过差分编码和差分译码,四维8PSK网格编码调制能够有效地实现45°相位旋转不变性,克服参考载波多重相位含糊度的影响。
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  相似匹配句对
     With reference to B.F.
     本文参考 B.F.
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     REFERENCE
     每月参考
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     The Carrier
     浅谈催化反应中活性组分的载体
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     Identification of the carrier
     承运人识别的法律问题
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     Re-evaluation of Two Carrier Smoothed Code Algorithms for WADGPS Reference Stations
     广域差分参考站两种伪距平滑算法的再评估
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  reference carrier
The demodulator incorporates a phaselocked loop to provide a reference carrier for demodulation.
      


All digital receiver is a new concept proposed in recent years. It needs that a local reference carrier used to demodulation (mixing osicillator) and the A/D converter sampling clock run at fixed fre-quencys and do not require feedback control of signals. It is also needed to carry out some other works such as the elimination of carrier phase difference and clock synchronization error, the detection of signals etc. In the subsequent digital signal processing part. The carrier phase recovery...

All digital receiver is a new concept proposed in recent years. It needs that a local reference carrier used to demodulation (mixing osicillator) and the A/D converter sampling clock run at fixed fre-quencys and do not require feedback control of signals. It is also needed to carry out some other works such as the elimination of carrier phase difference and clock synchronization error, the detection of signals etc. In the subsequent digital signal processing part. The carrier phase recovery and clock synchronization are two main problems for the all digital receivers. In this paper, the problem of carrier phase recovery is considered. It has discussed the difference between estimation of eiθ and estimation of θ about algorithms of carrier phase recovery and the theoretical analysis is given. The result of theoretical analysis has shown that estimation of eiθ has much better performance than estimation of θ in statistics. A new method to estimate eiθ is proposed. The new method gains two advantages: (1) The phase interval jump doss not exist. (2) The phase estimator has a simple and fully linear structure which is easy to be implemented. The results of computer simulation for 16-QAM signal are also reported which shows the new method is feasible.

全数字接收机是在最近几年内提出的一个新的概念,它要求解调用的本地参考载波和采样时钟都振荡于固定的频率,不需要进行反馈控制,其他一些工作:载波相位误差和时钟定时误差的消除、信号的判定等全部由采样后的数字信号处理器完成。载波相位恢复问题和时钟同步问题是目前关于全数字接收机研究中的两个最主要的问题。本文仅讨论载波相位恢复问题。在本文中研究了载波相位估计算法中估计e~(jθ)和估计θ的差异,从理论上证明了估计e~(jθ)比估计θ有更好的统计特性,并且给出了一种估计e~(jθ)的方法,此方法有二个突出的优点:(1)它可以消除载波相位恢复过程中的相位区间跳变。(2)相位估计器的结构简单,它是全线性的,易于实现。利用16-QAM信号进行计算机仿真证实了此算法的可行性。

A Four-Dimension 8PSK Trellis-Coded Modulation (TCM) of coding rate R = 5/6, constraint length v= 3 is studied in this paper, together with an all digital synchronous algorithm. The result shows that 45° rotationally invariancc can be easily reached by differential coding and decoding, and can overcome the impairment of multiple phase ambiguities of reference carrier. Digital filtering timing extraction algorithm and phase processing carrier recovery algorithm are used in the all digital synchronous...

A Four-Dimension 8PSK Trellis-Coded Modulation (TCM) of coding rate R = 5/6, constraint length v= 3 is studied in this paper, together with an all digital synchronous algorithm. The result shows that 45° rotationally invariancc can be easily reached by differential coding and decoding, and can overcome the impairment of multiple phase ambiguities of reference carrier. Digital filtering timing extraction algorithm and phase processing carrier recovery algorithm are used in the all digital synchronous receiving. The timing estimation can be optimized through Kalman filtering, and fast acquisition of carrier phase can be obtained from the receiving signals.

本文研究了一种码率为5/6,约束长度为3的四维8PSK网格编码调制系统,对编码器、译码器及全数字化同步算法进行了分析和研究。结果表明,通过差分编码和差分译码,四维8PSK网格编码调制能够有效地实现45°相位旋转不变性,克服参考载波多重相位含糊度的影响。全数字化同步接收采用数字滤波定时提取算法和相位处理载波恢复算法,通过卡曼滤波对定时偏差估计值进行优化,并实现对接收信号的快速载波跟踪。

In the era of information, many new phenomena appear in book markets. Book issuing channels and reference carriers are all changed. So that the reform and innovation on the purchasing procedure and regulation must be made in order to suit the new situation, and to fulfill the tasks of building the library resources base.

处于信息时代 ,图书市场出现了新情况。图书发行渠道、文献载体形态均有了新变化 ,图书采购也必然要在采购程序、规则、方法上不断改革、创新以适应形势 ,完成图书资源建设任务。

 
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