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相干通信
相关语句
  coherent communication
     THE JOINT ESTIMATION OF MESSAGE AND CHANNEL PROCESSES IN COHERENT COMMUNICATION
     相干通信中消息和信道过程的联合估计
短句来源
     In coherent communication, a message model has the randomly driv'ng property because of the target's dynamic characteristic.
     相干通信中,由于目标的动态特性,使消息模型具有随机策动的性质。
短句来源
     A method of fast carrier recovering for PSK signal in a coherent communication system is introduced in this paper. The theoretic analysis and the experimental result are given, and the further improving method is also given.
     本文给出了一种相干通信系统中对移相键控(PSK)调相信号快速恢复载波的方法进行了理论分析,给出了实验结果,并指出了改进的方法。
短句来源
  “相干通信”译为未确定词的双语例句
     Effect of Laser Noise on Receiver Performance of Coherent Fiber-Optic Communication Systems
     激光源噪声对光纤相干通信接收机性能的影响
短句来源
     A novel receiver algorithm for underwater acoustic coherent communications
     一种新颖的水声相干通信接收算法
短句来源
     This thesis focuses on the phase coherent UWA communication techniques.
     本文对相位相干通信技术在水声信道中的应用进行了深入的研究。
短句来源
     This paper deals with the effect of FM quantum noise of laser sources on the receiver performance in coherent fiber-optic communication systems.
     本文分析了激光源FM量子噪声对数字光纤相干通信接收机性能的影响。
短句来源
     Research of Phase-Coherent Communications and Adaptive Equalization for UWA Channels
     水声相位相干通信与自适应均衡技术研究
短句来源
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  相似匹配句对
     The System of Coherent Optical Fiber Communication
     相干光纤通信系统
短句来源
     Prospects for Coherent Optical Fiber Communication Technology
     相干光纤通信技术的进展
短句来源
     Communication ICs
     通信电路
短句来源
     Computer Network Communication
     计算机网络通信
短句来源
     Coherent Excitation on Biological System
     生物系统的相干激励
短句来源
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  coherent communication
Retrodiction for coherent communication with homodyne or heterodyne
      
Conflicts between researchers, practitioners and policy makers stem from lack of mutual understanding of their roles, the need to balance scientific rigour against the urgency of government and practice, and inadequate coherent communication.
      
Opteron processors can use up to three HT links for cache-coherent communication between different processors in multiprocessor systems.
      
Testing first revealed that 19.2k baud was an appropriate bit rate for coherent communication between the receiver and the application.
      
Use of ontology permits coherent communication between the different agents and facilitates sharing of the information among different agents.
      
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In coherent communication, a message model has the randomly driv'ng property because of the target's dynamic characteristic. When the angle modulation signals made up of the message model have passed through a randomly time-varying channel, a complex nonlinear estimation model is formed. In this paper, the method to carry out the joint estimation to the message and channel processes is applied so that an optimal nonlinear phase estimator can be built.In this paper, we first set up the message model by an expanding...

In coherent communication, a message model has the randomly driv'ng property because of the target's dynamic characteristic. When the angle modulation signals made up of the message model have passed through a randomly time-varying channel, a complex nonlinear estimation model is formed. In this paper, the method to carry out the joint estimation to the message and channel processes is applied so that an optimal nonlinear phase estimator can be built.In this paper, we first set up the message model by an expanding state--variable approach and then discuss the conditional Fokker-Planck equation, and from here, derive the estimation equation and the variance equation, construct the conditional mean filter algorithm. In terms of applying this algorithm and the extended Kalman filter algorithm, the optimal nonlinear phase estimators, which are obtained when the angle modulation signals drived by a white noise have passed through the randomly time-varying channel, is derived.Finally, applying the results given out by computer, we come to the conclusion that the nonlinear phase estimator which is obtained by carrying out the joint estimation to the massage and channel processes is optimum.

相干通信中,由于目标的动态特性,使消息模型具有随机策动的性质。当此消息模型构成的角调信号通过随机时变信道后,形成复杂的非线性估计模型。本文采用对消息和信道过程进行联合估计的方法,以建立最佳非线性相位估计器。 文中首先应用扩大状态变量方法建立消息模型,然后讨论条件福克—普朗克方程,并由此导出估计方程和方差方程,构造条件均值滤波算法。应用这一算法以及推广卡尔曼滤波算法,导出了由白噪声策动的角调信号通过随机时变信道后的最佳非线性相位估计器。 最后,应用计算机给出的结果,得出了对消息和信道过程进行联合估计所获得的非线性相位估计器为最优的结论。

The digital phase-locked loop (DPLL) is widely [used [along with the development of digital coherence communication. A new DPLL with the fast pull-in phase discriminator circuit and variable reset random walk filter (VR-RWF) is developed.In this paper, the basic principle of this DPLL and the concept of the dynamic probability transformation characteristic are proposed. Some Problems in the design and adjustment of the phase detector and filter are described emphatically, and the way forward for their improvement...

The digital phase-locked loop (DPLL) is widely [used [along with the development of digital coherence communication. A new DPLL with the fast pull-in phase discriminator circuit and variable reset random walk filter (VR-RWF) is developed.In this paper, the basic principle of this DPLL and the concept of the dynamic probability transformation characteristic are proposed. Some Problems in the design and adjustment of the phase detector and filter are described emphatically, and the way forward for their improvement is pointed out. The flow chart for calculating the pull-in time is given. Finally the results of simulation are tabulated for convenience of usage.

随着数字相干通信技术的发展,数字锁相环(DPLL)的应用越来越广泛。作者参阅了国外最新文献,研制出了一种有实用价值的锁相环—具有快捕鉴相器(积分式)和可变复位随机徘徊滤波器的数字锁相环。本文简述了它的工作原理,并在前人分析的基础上提出了滤波器动态概率变换特性的概念。本文着重介绍了锁相环中鉴相器和滤波器两部分电路设计及调试中的一些问题,指出了继续改进的方向,给出了最大捕捉时间的计算机模拟程序框图及部分模拟结果。

This paper deals with the effect of FM quantum noise of laser sources on the receiver performance in coherent fiber-optic communication systems. Based on a statistical model which describes the phase fluctuation of laser field due to the spontaneous radiation as a Wiener process, a modification to the conventional theory of correlation receiver can be made so as to calculate the error rate of ASK, FSK and PSK coherent demodulator and evaluate the penalty of receiver sensitivity under the condition that the carrier...

This paper deals with the effect of FM quantum noise of laser sources on the receiver performance in coherent fiber-optic communication systems. Based on a statistical model which describes the phase fluctuation of laser field due to the spontaneous radiation as a Wiener process, a modification to the conventional theory of correlation receiver can be made so as to calculate the error rate of ASK, FSK and PSK coherent demodulator and evaluate the penalty of receiver sensitivity under the condition that the carrier is parasitically frequency-modulated by a stationary Gaussian noise. Numerical results show that if the product Dr (phase diffusion constant of laser x delay time of carrier recovery circuit of demodulator) is greater than 1, the sensitivity loss of fiber-optic receivers which employ coherent demodulation will be in the order of 10 dB. Therefore laser noise suppression certainly plays a key role in the efforts to fully take the potential advantage of coherent fiber-optic communication.

本文分析了激光源FM量子噪声对数字光纤相干通信接收机性能的影响。文章从一种统计模型出发,指出由自发辐射所造成的激光场相位起伏是一个维纳过程。据此对传统的相关接收机理论作出了修改,能够用来在载波含有平稳高斯型寄生调频的条件下计算ASK、FSK、PSK相干解调器的误码率,估计载波相位起伏所导致的接收机灵敏度损失。计算实例显示,在激光源相位扩散常数与解调器载波恢复电路延迟时间之积D_τ>1时,光纤相干解调接收机的灵敏度损失会达到10dB量级。因此,为了发挥光纤相干通信的潜在优越性,压抑激光器噪声是必须解决的技术关键。

 
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