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Questions tagged [modulation]

Anything related to *signal modulation*, i.e. the process of encoding the information provided by some source into the variations of some property (e.g. amplitude, frequency, phase, polarization, etc.) of a carrier signal suitable to be transmitted over a communication channel.

Anything related to signal modulation, i.e. the process of encoding the information provided by some source into the variations of some property (e.g. amplitude, frequency, phase, polarization, etc.) of a carrier signal suitable to be transmitted over a communication channel.

See Wikipedia page on signal modulation.

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Understanding of Multi-modular project android

I have three modules in my project say ModuleA, ModuleB, ModuleC. My problem is when i run the project every time all the three module getting recompiled irrespective of the changes made in the module, But what i found in some of the blog is that…
Stack
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How do I eliminate "uninteresting" parts of waveform from a non-uniform waveform using MATLAB functions?

I have signal(s) (of a person climbing stairs.) of the following nature. This is a signal worth 38K + samples over a period of 6 minutes of stair ascent. The parts where there is some low frequency noise are the times when the person would take a…
Shreya Bhatia
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PHP Modulus operator is not work in calculator

I am Trying to Creat a calculator in PHP. All other operator is working (ex:+,_,*,/) but only Modulus % operator is not working. Please solve this problem.
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Kowsar Hossen
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Where I can find Envelope Detector Block in Simulink?

Where I can find Envelope Detector blocks in Simulink like that 2 below:
roadtosleep
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How to control bandwidth in OFDM using GNURadio

I am trying to simulate an 802.11 OFDM signal at 20/40/80 and 160 MHz bandwidths using GNURadio, starting with the ofdm_tx.grc example. Using this example I can easily generate a 20 MHz signal simply by increasing the sample_rate to 20M. However I…
jknoles
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Converting audible sound to ultrasonic

I have sound clips that are about 3-4 seconds in human audible range. I want to convert them into ultrasonic range so that when I transmit them they are not audible to humans. I read that I need to use amplitude modulation. I used the modulate…
krish
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Plottng Error Vector Must Be Same Length

So I'm Having Trouble graphing this SSB signal after I modulated it. I keep getting the Vector Length error. function SSB = SSBMOD %Setting Up Variables amplitude = 1; % Defining Amplitude tau_in = 0.010; %Defining Tau t_in = -0.010:0.0001:0.010; %…
Zanderg
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AM Signal Modulation

So I have two separate Functions here. In the first function I am generating a signal that I want to modulate. I have to take the output from the first function and use it in the second one. function [output] =…
Zanderg
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varying phase during phase shift keying

I am doing phase shift keying of binary data. This is what I am doing, f=10; m=[]; b = [1 0 0 1 1 1 0] for i=1:1:length(b) if (b(i)==1) Modulated=10*cos(2*pi*f*t2); else Modulated=10*cos(2*pi*f*t2 +…
cppiscute
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Wavelet modulation in MATLAB

I need to plot the waveform for the following expression:- . I don't understand how to define a wavelet as a function of time 't' (where 't' I will define)? How do I scale and translate a wavelet? [phi,psi,xval] = wavefun('db4',10); %extracting…
Priyanka Kaswan
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got frequency, need plot sinus wave

I am just fighting with modulation of sinus wave. I have got a frequency (from messured data - changing in time) and now I need to plot sinus wave with coresponding frequency. The blue line are just plotted points of real data and the green is what…
Robin Popelka
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Identify binary state of data set (frequency on/off)

I have a large data set that has values ranging from [-3,3] and I'm using a hard limit at 0 as the boundary. The data has a binary value of 1 when its oscillating from -3,3 at a 56kHz frequency. What this means is that the data will be changing from…
Roy
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Demodulating an FSK signal in Python

I am trying to write a Python script that can demodulate an FSK modulated audio file and return the data encoded in the audio. The data being transmitted is GPS NMEA strings which are embedded as the audio channel in video files. Basically, text…
Evan
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AM Modulation in MATLAB: Sampling frequency?

I'm trying to modulate a carrier of Fc=10 KHz with a sinusoidal message of Fm = 200 Hz (from 0 to 1 in time-domain) The sampling rate Fs=1 KHz. This is my code: fs=1000; % sampling freq. ts=1/fs; t= 0 : ts : 1; % time…
DarkLight
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Matlab: Error when working with higher order QAM signal - Matrix dimension must agree

This problem seems to be trivial but I am left scratching my head when trying to resolve it. I am trying to apply Fractionally spaced equalizer with constant modulus technique for 64 QAM constellation. The program works for QPSK or 4 QAM but when I…
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