为了探讨下,为什么需要加上原始的载波信号,用matlab进行一点尝试性的工作。 首先,产生两个信号,左边的是载波信号,幅度为2,右边的是我们需要传递的信息。 其中,载波信号为yc(t)=2sin(2π⋅50t)调制信号为ym(t)=cos(2π⋅10t) 其次,分别绘制出两者的频谱 之后,分别绘制出y(t)=\alpha sin(\omega_c ...
调制具体实现并非简单相乘，而需考虑载波信号的频率、振幅及波形限制。载波频率、振幅直接关联调制信号特征的直观性，非稳定波形可能使信息提取难度增大。调制后的波形表示为载波与调制信号乘积后的和。常见的调制表达式形式多样，但核心在于载波与调制信号的乘积。为了探索为何需要原始载波信号，通过Matlab进行了...
MATLAB Online에서 열기 Here's one way to do this. I'm showing two graphs, one with 5 Hz amplitude modulation, one with 5 kHz amplitude modulation. I've also passed the modulated signal into the sound function, so you can hear the result as well. At...
The signal modulation and demodulation course was analysed in details according to time and frequence convolution theorem,and simulated with the swiftness,convenience and accuracy of Matlab software.The result was satisfied.It is helpful to apply this course of simulation to the theory and experiment ...
Matlab Coding Solution 1% MATLAB scriptforIllustrative Problem3.4.2% Demonstration scriptforLSSB-AM modulation. The message signal3%is+1for0< t < t0/3, -2fort0/3< t < 2t0/3, and zero otherwise.4echo on5t0=.15; %signal duration6ts=0.001; %sampling interval7fc=250; %carrier frequency...
Matlab Coding 1% MATLAB scriptforIllustrative Problem3.7.2% Demonstration scriptforLSSB-AM demodulation. The message signal3%is+1for0< t < t0/3, -2fort0/3< t < 2t0/3, and zero otherwise.4echo on5t0=.15; %signal duration6ts=1/1500; %sampling interval7fc=250; %carrier frequency8fs...
MATLAB Simulink models are formed to generate the multilevel modulation formats, transmission, and detection in optically amplified fiber communication systems. Transmission performance is obtained for the multilevel optical signals and proven to be equivalent or better than those of binary level with ...
Stimuli were created in MATLAB (MATLAB Release 2013b, The MathWorks, Inc., Natick, Massachusetts, United States) with a sampling rate of 44100 Hz. The modulation rate was 8 Hz, which provided four full AM cycles for a sound duration of 500 ms. The noise carrier was created by filtering ...
Luis F. Chaparro, in Signals and Systems using MATLAB, 2011 2.13 QAM System A quadrature amplitude modulation (QAM) system is a communication system capable of transmitting two messages m1(t), m2(t) at the same time. The transmitted signal s(t) is s(t)=m1(t) cos(Ωct)+m2(t) ...
frequency modulation fourier transform amplitude spectrum advanced engineeri... Products MATLAB Community Treasure Hunt Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! Modeling Wireless Interference Scenarios ...