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现有数字信号自动调制识别方法大多只适用于无记忆信号,如PSK、ASK、FSK信号等。将有记忆
信号(MSK信号)和无记忆信号一起考虑,提出了一种改进的数字信号自动识别方法。该方法采用信号的瞬时统
计量作为特征参数,采用多层神经网络作为分类器。计算机仿真表明:当噪声采用高斯白噪声,并且信噪比大于
l5 dB时,识别率高于96% ;当信噪比不低于l0 dB时,识别率不低于90%。,Existing digital signal automatic modulation recognition
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ASK(二进制幅度键控)是一种最简单的数字信号的载波传输,本文通过对数字信号的2ASK调制,解调在不同信噪比的情况下误码率分析,得出不同信噪比下的误码率。
通过对2ASK的仿真更好的理解了数字调制系统的组成以及各模块的功能。
,ASK (binary amplitude shift keying) is a simple digital signal carrier transmission, this paper 2ASK digital signal modulation, demod
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DIGITAL MODULATION SCHEMES
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DRM(Digital Radio Mondiale)系统采用OFDM调制方式, 引入了先进的信源信道编码和调制技术,使得AM波段的音频广播质量大大提高,在保持现有10kHz带宽时接近了FM广播的质量[5]-DRM (Digital Radio Mondiale) system uses OFDM modulation, the introduction of advanced source-channel coding and modulation techniques, making AM-
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语音编码为信源编码,是将模拟信号转变为数字信号,然后在信道中传输。在数字移动通信中,语音编码技术具有相当关键的作用,高质量低速率的话音编码技术与高效率数字调制技术相结合,可以为数字移动网提供高于模拟移动网的系统容量。目前,国际上语音编码技术的研究方向有两个:降低话音编码速率和提高话音质。-Speech coding for source coding is the analog signal into a digital signal, and then in the channel trans
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a very good tutorial in describing digital modulation especially the contallation diagram
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introduction to digital modulation
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DAB接收机,包括信道解码的资料。DAB系统中载波频偏估计等。
-The Digital Audio Broadcasting (DAB)
system promises to provide CD-quality sounds and
flexible data services to mobile, portable and fixed
receivers. In order to achieve high quality in
multipath environment
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An 8-QAM communications channel simulation in Simulink, constructed from a 16-QAM model and using an I,Q correlation receiver.
QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single chan
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LPF Rectangular PAM Communication System.
Pulse-amplitude modulation is widely used in baseband transmission of digital data, with non-baseband applications having been largely superseded by pulse-code modulation, and, more recently, by pulse-p
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通信仿真学习必备,基于MATLAB的数字调制信号仿真系统设计-Learn essential communication simulation, MATLAB-based Simulation System for digital modulation signals
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设计一个2DPSK数字调制系统,要求:
(1)设计出规定的数字通信系统的结构;
(2)根据通信原理,设计出各个模块的参数(例如码速率,滤波器的截止频率等);
(3)用Matlab或SystemView 实现该数字通信系统;
(4)观察仿真并进行波形分析;
(5)系统的性能评价。
-Design a 2DPSK digital modulation system requirements: (1) design a digital communication sys
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communication system is expected to increase the service, the quality improvement and also the capacity, using spread spectrum communication system is one of the method to fulfill that demand. This quality and capacity factor will depend on the numb
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基于MATLAB的二进制数字系统的调制(包括2ask_2fsk_2psk_2dpsk)-Based on the the MATLAB binary digital modulation (including 2ask_2fsk_2psk_2dpsk)
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Digital modulation GMSK
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对现有数字调制方式识别类型有限的问题,提出一种基于星座图的分类算法。算法首先利用盲均衡技术克服信道的多径效应与系统问步误差,再对信号减法聚类,提取聚类中心与理想星座图模型进行匹配,从而实现MAsK、MPsK、MOAM等调制方式的识别。-Existing types of digital modulation recognition of limited problem, a classification algorithm based on the constellation. Firstly,
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基于MATLAB的数字调制与解调的设计,以及仿真的实现-Digital modulation and demodulation MATLAB design, and simulation-based implementation
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用数值方法实现2FSK信号的相关型解调。采用的两个2FSK波形信号为:si(t)=cos(2πfit),i=1,2,0≤t≤Tb。这里f1=1000/Tb, f2=f1+1/Tb。-Digital modulation.
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This is the Graphical User Interface for performing Digital Modulation like ASK,PSK and FSK.This project can be extended for further digital modulation techniques.
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Section 3-1 Digital Modulation Techniques
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