％The phase locked loop(PLL),adjusts the phase of a local oscillator ％w.r.t the incoming modulated signal.In this way,the phase of the ％incoming signal is locked and the signal is demodulated.This scheme ％is used in PM and FM as well. ％We will implement it by using a closed loop system.Control systems ％techniques are applied here.
标签： phase w.r.t oscillator modulated
上传时间： 2015-09-28
上传用户：zhangzhenyu
用VB编写的程序，演示出AM调制前后和解调后的波形之间的关系
上传时间： 2013-12-20
上传用户：李梦晗
本毕业设计用Matlab中的建模仿真工具Simulink对通信原理实验进行仿真。作为系列实验的第一部分，包括模拟信号的线性调制解调(AM、DSB、SSB)过程、扰码与解扰实验和低通信号的抽样定理实验。论文中讲述了Matlab的基础知识、Simulink仿真操作方法以及在通信系统中的应用，对被仿真实验的基本原理也进行了简要介绍。 通过本设计对构造通信原理虚拟实验室这一课题进行了初步的探索。
上传时间： 2015-10-21
上传用户：daoxiang126
This script was designed as a stand alone script which can be easily intergrate into any existing website as it is,but if you want to intergrate it into a site which uses a content management format, then some alterations will have to be done for it to work properly. Remember this is a project and I am constantly working to improve it, so I can t guarantee that it will work for everyones needs, but dammmmd close.
标签： script intergrate designed existing
上传时间： 2015-11-29
上传用户：Ants
与上一个上传源码属同一问题的不同方面，均为用matlab来实现am调制与解调，以及仿真实现。
上传时间： 2015-12-02
上传用户：liansi
与上一个上传源码属同一问题的不同方面，均为用matlab来实现am调制与解调，以及仿真实现。
上传时间： 2015-12-02
上传用户：JasonC
与上一个上传源码属同一问题的不同方面，均为用matlab来实现am调制与解调，以及仿真实现。
上传时间： 2015-12-02
上传用户：朗朗乾坤
与先前上传的文件一样，为通信系统中am调制与解调的matlab程序实现，并仿真实现，程序各行均有完整的说明，简明易懂！
标签：
上传时间： 2015-12-02
上传用户：kr770906
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
Digital broadcasting systems for television, sound and data services Framing structure, channel coding and modulation for 11/12 GHz satellite services
标签： broadcasting television structure services
上传时间： 2016-01-03
上传用户：rishian
