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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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Is ADSL digital or analog?

I've read that ADSL uses frequency-divided multiplexing and only analog signals use FDM. Then why there's the term 'digital' in ADSL(Asymmetric digital subscriber line) if it uses analog signals?
KavG
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Why the BER for 16QAM is better than that of 32QAM

I am a little confused about the BER. I found that the BER of 16QAM is better than that of 32QAM. is this right, if so, why we go to higher QAM (i.e. 32, 64, and etc). thank you in advance
Serwan Bamerni
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BPSK constellation decoding using gnuradio

I'm trying to decode a BPSK signal on GNU Radio and I'm struggling a bit so I hope maybe you will be able to help me. The flowgraph I'm using is the following : The bit frame I'm sending at the input of the flowgraph is : 1a cf fc 1d ff fd 55 53…
Ncaseau
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BPSK demodulation using an USRP N210 and GNU Radio

I'm trying to implement a BPSK demodulation on GNU Radio using a USRP N210. However I'm not quite getting the results I was hoping for. I'm using the "Symbol Sync" block for timing synchronization and the "Costas Loop" block for carrier recovery as…
Ncaseau
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Decreasing linear model with a Sine Wave in R

I am attempting to create a linear model that incorporates a Sine Wave with decreasing amplitude over time. I am able to successfully incorporate a simple sine wave into my model using the following code: #sine curve equation resolving 12 months…
kphacker
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Can I modify the HTML contents which passing through the Wireguard?

I set up a VPN server for my team with Wireguard. I want my teammate to notice that their networks are over the VPN by showing small icon in the web page which they visit. Is there any ways to achieve this? - Can I modify the HTML data which is…
Hodol
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Frequency modulation: which algorithm for numeric signals (Java, Swift, etc.)

I'm writing an audio app in Swift - and one task consists in frequency modulation of a given signal (microphone input or sound file) - thus I'm iterating through all frames of a buffer like let leftSourceData = readBuffer.floatChannelData?[0] let…
Ulrich Vormbrock
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Decoding UART with gnuradio

I was struggling with designing an application with gnuradio, that would receive and decode ASK modulated signal that is transmitting UART messages. It seems to me like an obvious thing to do, but I can't find any straightforward method, other than…
Liberat0r
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Is there a way of sending and receiving signals for modulated signal's using python?

Ive been trying to find ways of sending modulated signals on python which then later down the line do analyses on the data sent and received. At the moment i just want to be able to send data using a modulation format such as PAM and then receive…
Sam
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lowpass filter design matlab

I want to create a script that will manually modulate and demodulate a signal. I am using DSB-SC modulation and I am just confused on how to build the lowpass filter for the demodulation of the signal. Here is what I have so far: close all; clear…
Brian E
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How do I modulate a signal for radio transmission (SDR) in Java?

Off Topic: Let me start by saying Java is completely new to me. I've been programming for over 15 years and never have had a need for it beyond modifying others' codebases, so please forgive my ignorance and possibly improper terminology. I'm also…
Ryan
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How to output an amplitude of 10V PWM signal?

I have constructed a Pulse width modulating circuit that should output an amplitude of 10 Volts PWM signal. The control input signal is a 5Vpp, 100Hz sine wave and a pulse input of 10Vpp, 1kHz square wave.  I know that the VCC value controls the…
Jamie.F
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Frequency Shift Keying in Python

I am looking to take a digital signal and modulate it with 0's and 1's into an analog signal using python. The problem I am having is the wave seems to be going the wrong direction when it shifts. Here is my code so far, I know it isn't…
AsapHogFtw
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Voltage level modulation for different speed of Ethernet interface

Got a question about the voltage level modulation on ethernet interface. We use PAM3 for 100base-T, PAM5 for 1000base-T and PAM16 for 10G. However, looks like we’re using PAM4 for 100G and 200G application. Does someone know why we’re doing so? Why…
Nobody
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What does a group of numbers minus the average divided by the average mean?

X is a sequence of real numbers, X bar is the average of the array X, and X with subscript max is the maximum value of the array. This is a calculation process in the code, because there is no comment, so I don't understand what it is doing. X is…
lizzoe
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