We address the problem of blind carrier frequency-offset (CFO) estimation in quadrature amplitude modulation, phase-shift keying, and pulse amplitude modulation communications systems.We study the perFormance of a standard CFO estimate, which consists of first raising the received signal to the Mth power, where M is an integer depending on the type and size of the symbol constellation, and then applying the nonlinear least squares (NLLS) estimation approach. At low signal-to noise ratio (SNR), the NLLS method fails to provide an accurate CFO estimate because of the presence of outliers. In this letter, we derive an approximate closed-Form expression for the outlier probability. This enables us to predict the mean-square error (MSE) on CFO estimation for all SNR values. For a given SNR, the new results also give insight into the minimum number of samples required in the CFO estimation procedure, in order to ensure that the MSE on estimation is not significantly affected by the outliers.
标签： frequency-offset estimation quadrature amplitude
上传时间： 2014-01-22
上传用户：牛布牛
This paper examines the asymptotic (large sample) perFormance of a family of non-data aided feedforward (NDA FF) nonlinear least-squares (NLS) type carrier frequency estimators for burst-mode phase shift keying (PSK) modulations transmitted through AWGN and flat Ricean-fading channels. The asymptotic perFormance of these estimators is established in closed-Form expression and compared with the modified Cram`er-Rao bound (MCRB). A best linear unbiased estimator (BLUE), which exhibits the lowest asymptotic variance within the family of NDA FF NLS-type estimators, is also proposed.
标签： perFormance asymptotic examines non-data
上传时间： 2015-12-30
上传用户：225588
Carrier-phase synchronization can be approached in a general manner by estimating the multiplicative distortion (MD) to which a baseband received signal in an RF or coherent optical transmission system is subjected. This paper presents a unified modeling and estimation of the MD in finite-alphabet digital communication systems. A simple Form of MD is the camer phase exp GO) which has to be estimated and compensated for in a coherent receiver. A more general case with fading must, however, allow for amplitude as well as phase variations of the MD. We assume a state-variable model for the MD and generally obtain a nonlinear estimation problem with additional randomly-varying system parameters such as received signal power, frequency offset, and Doppler spread. An extended Kalman filter is then applied as a near-optimal solution to the adaptive MD and channel parameter estimation problem. Examples are given to show the use and some advantages of this scheme.
标签： synchronization Carrier-phase multiplicativ approached
上传时间： 2013-11-28
上传用户：windwolf2000
《C++Builder数据库开发实用教程》光盘使用说明: 一、本光盘包括如下文件： (1)Forms.rar,这是本书要做的工程的可重用窗体文件。 (2)Band4.rar,这是本书所做的窗体应用程序的全部代码。 (3)cert.rar,这是测试证书制作包。 (4)Addition.rar,这是控制扫描设备的DLL文件。 (5)Exam.rar,这是移植后的Active Form工程。 (6)ExamSite.rar,这是部署后的工程。 (7)SampleBMPs.rar,五幅BMP图片，供学习中使用。 (8)VFWForBCB.rar,这是附录五“VFW视频实时捕获技术”的工程文件。 (9)ssqyScore.rar,C++Builder 6 + Access数据库开发的软件《浙江师范大学信息学院研究生成绩管理系统》的源代码，
上传时间： 2016-01-05
上传用户：1051290259
hanks for downloading this code. This VB Project shows you how to make Forms with "rounded rectangle" shape. It also shows you how you can reduce the size of your programs with a GUI by using blocks of images and absolutely positioning and stretching them to create a dialog box, rather than making the whole dialog box in a graphics program and setting it as the Picture property of the Form. Another advantage of using image blocks is that you can resize this Form to virtually any size and the effect will still be the same.
标签： downloading rectangle Project rounded
上传时间： 2013-12-13
上传用户：zhangliming420
16 relay output channels and 16 isolated digital input channels LED indicators to show activated relays Jumper selectable Form A/Form B-type relay output channel Output status read-back Keep relay output values when hot system reset High-voltage isolation on input channels(2,500 VDC) Hi ESD protection(2,00VDC) High over-voltage protection(70VDC) Wide input range(10~50VDC) Interrupt handling capability High-density DB-62 connector Board ID
标签： channels indicators activated isolated
上传时间： 2016-02-15
上传用户：dongbaobao
This document represents the first stage in a process of taking the National Strategy for Police InFormation Systems (NSPIS) forward. It defines the mechanisms to ensure that we (and our partners) have access to the right inFormation, in the right Form, in the right time at an appropriate cost. The Strategy will ensure the Police Service has a collective understanding of the value of inFormation and that we are able to exploit National InFormation Assets in support of local policing.
标签： represents the National Strategy
上传时间： 2016-03-08
上传用户：wangdean1101
javascript中文教程 <INPUT TYPE="button" NAME="objectName" VALUE="buttonText" [onClick="handlerText"]> NAME specifies the name of the button object as a property of the enclosing Form object and can be accessed using the name property. VALUE specifies the label to display on the button face and can be accessed using the value property.
标签： javascript buttonText objectName onClick
上传时间： 2014-01-25
上传用户：aix008
做一个简易的“+ - x /”计算器：在Applet中加入2个提示标签，1个显示结果的标签，两个输入文本域，四个单选按钮（标题分别为+-×/），1个“计算”按钮，分别输入2整数后，选择相应运算符，点击“计算”按钮后显示结果。两个Form窗口的链接
上传时间： 2013-12-27
上传用户：开怀常笑
LiScNLS is a Matlab application for the numerical study of some nonlinear differential equations of the Form Lu=Nu, using the Lyapunov-Schmidt method. Downloading the LiScNLS package creates a new LiScNLS folder on the computer.
标签： differential application equations numerical
上传时间： 2013-12-21
上传用户：hustfanenze
