Restoration of signals degraded by impulse noise by means of a low-distortion non-linear filter

A simple low-distortion non-linear filter for the restoration of signals degraded by random impulsive noise is proposed. It performs considerably better than a median filter, lowering the reproducing error both in mean-square and maximum-error sense, although being comparable in computing time and in terms of storage.     

三光子吸收效应与误码率

本文用噪音微扰场讨论了三光子吸收效应对光纤放大器的增益噪音和误码率的影响.由此得到三光子吸收效应能抑制该类噪音和减小误码率而有利于光孤子通信的结论.     

On the Positivity of the Stochastic Heat Equation

We study the positivity preserving properties of the heat equation with a white noise potential and random initial condition. Moreover, we find a generalized Feynman--Kac formula for the solution of the problem using methods from the white noise analysis. The initial condition can anticipate the driving white noise. We show that the solution is positive, when the random initial condition is positive. For the case of a time-dependent white noise potential, we give a special representation of the solution together with regularity results.     

Analysis of Staggered OFDM Data Transmission With Reduced Complexity

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Quantum-state diffusion with adaptive noise

We present a scheme for stochastic quantum-state diffusion (QSD) with adaptive noise to calculate the time evolution of an arbitrary observable of an open system. The method is based on the fact that the observable is much less sensitive to adaptive noise than to noise with a random phase. Hence, the individual realisations of the expectation value of the observable stay closer to the average evolution and fewer realisations are required to obtain the ensemble average. This is illustrated by applying QSD to a driven two-level system using both randomly phased and adaptive noise. Applying QSD with adaptive noise to an undriven two-level system enables us to derive a deterministic Schr?dinger equation that produces the exact evolution of an arbitrary observable. Received: 31 July 1997 / Received in final form: 12 February 1998 / Accepted: 13 March 1998     

双口网络噪声模型的系统理论及其应用

从放大器实际存在的时域原始噪声模型出发，推导出两个时域等效噪声模型，并由此扩展到频域，得到了相对应的几个功率谱噪声模型，从而系统地给出了双口网络噪声模型理论和一系列实用的计算公式．将这些理论应用到光纤通信接收机前置放大器的噪声计算上，用统一的方法，算出了光接收机ＢＪＴ和ＦＥＴ前置放大器的等效输入端噪声电压电流功率谱，供光接收机设计使用     

高密度封装的△I噪声分析

介绍了一种分析封装中△Ｉ噪声的电路模型，根据此模型推导出输出电压方程。应用该方程分析讨论了封装中电源线、接地线及旁路电容对△Ⅰ噪声所产生的影响，总结了控制封装中电源线、接地线电参数的方法，并通过改变电源线、接地线参数及旁路电容值，实现了改善封装中△Ｉ噪声的目的。     

A low-noise 1.2–1.8 GHz cooled GaAs FET amplifier

A low-noise 1.2–1.8 GHz cooled GaAs FET amplifier with mixer bias circuit is reported. The amplifier noise temperature obtained at an ambient temperature of 20 K in the frequency range of 1.2–1.7 GHz is 10K. The lowest noise temperature is 4K. The gain is about 30 dB. An automatic measuring instrument for noise temperature was designed. The noise effect of the input cable and the error analysis of the total measurement were made. The total measurement error is 2 K.     

ANALYSIS OF INTERNALLY GENERATED NOISE OF BIOELECTRIC AMPLIFIERS

This papenr deals with internally generated noise of bioelectric amplifiers that are usually used for processing of bioelectric events.The main purpose of this paper is to present a procedure for analysis of the effects of internal noise generated by the active circuits and to evaluate the output noise of the author‘s new designed bioelectric amplifier that caused by internal effects to the amplifier circuit itself in order to compare it with the noise generated by conventional amplifiers.The obtained analysis results of internally generated noise showed that the total output noise of bioelectric active circuits does not increase when some of their resitors have a larger value.This behavior is caused by the different transfer functions for the signal and the respective noise sources associated with these resistors.Moreover,the new designed bioelectric amplifier haws an output noise less than that for conventional amplifiers.The obtained analysis results were also experimentally verified and the final conclusions were drawn.