Questions tagged [bpsk]
BPSK, a mechanism of modulation is expanded Binary Phase Shift Keying.
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QPSK implementation with 2 BPSK
I have a tiny problem with understanding a thing here.
for the 1st the phase shift is 0 degrees, so on its modulated wave we put 180-degree phase shift.
for the 2nd 0, the oscillator puts a 90-degree ...
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Sharp spikes in unknown signal [duplicate]
I am trying to decode an unknown signal, which has those really weird spikes/jumps.
My assumption is that it is somehow (B)PSK modulated but the signal looks really odd as shown in the screenshot. The ...
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Why is the symbol duration in QPSK twice the bit duration?
I saw many answers for such questions by writing down equations such that the symbol is formed of n bits so the duration of the symbol in QPSK must be n multiple of the bit duration.
I am not ...
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How is seen the BER of a BPSK DSSS?
I am trying to understand the DSSS (spread spectrum) performance improvments.
Let's consider that we are in BPSK and on a AWGN channel without any interferences or adjacent signals.
Is the theoretical ...
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iq bpsk waveform generation
We have a DAC capable of being driven with IQ data (thus the bandwidth is $-f_s/2$ to $f_s/2$), and the task is to create an "arbitrary" BPSK waveform at IF. I think that means generating ...
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A vanilla BPSK set up, but constellation disgram is a line
I set up a vanilla BPSK modulation in GNU-radio, but the constellation is showing me a line.
I am using: ...
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Effect of Passband Slope on a BPSK Constellation
What is the effect of a passband slope on a BPSK constellation? (This is a companion question to the related "DSP Puzzle" for QPSK)
Specifically given a linear slope (in magnitude, not dB), ...
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The difference about QPSK, BPSK and 16-QAM in spectrum
What is the difference about QPSK, BPSK and 16-QAM in spectrum? I just simulated all three, but I can't see the difference clearly.
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How is maximum log likelihood calculated for BPSK?
I am seeking to understand, exactly, how to calculate a soft MLL output from a received BPSK signal, and what information is needed. I would like to implement turbo coding in my system, but the ...
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BER formula for chirp spread spectrum BPSK modulation scheme
May I know how to derive the BER formula for chirp spread spectrum BPSK modulation scheme ?
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Correct Noise for NOMA system
I am trying to simulate a NOMA system with SIC, but I'm so confusing with the noise expression: $n_m \sim CN(0, \sigma^2_m)$, is zero mean complex additive Gaussian noise with variance at mth user
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BPSK based audio digital communication system
As part of my diploma thesis I'm implementing digital communication system based on audio transmission in free space (STMF401RE + analog microphone). I'm using BPSK modulation and I've implemented ...
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BPSK consecutive same symbols
I have a question regarding BPSK. If we want to modulate the bit stream $[0, 0]$ with $T_\text{ bit}=0.25 \text{ sec}$ and the carrier frequency of the cosine that carries the BPSK signal is $2\ \rm ...
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Averaging of a phase flipping signal
Suppose I want to average a signal $s(t)$ which consists of several spectral components without any DC offset. I sample $M$ points in the time domain. I am interested in the power spectrum which I get ...
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Do BPSK vs QPSK have the same performance?
I'm trying to re-learn digital communication theory again and am creating a bit error probability simulation for various modulations. So far I've added BPSK, QPSK, and 8PSK and below is a plot that ...
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Writing a BPSK Demodulator
As part of a larger project, I've been attempting to implement a demodulator for RDS, a digital transmission standard in FM broadcasting, in software with C++. I've easily been able to get as far as ...
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Cross-correlation for delay estimation in acoustic signals
iam doing BPSK transmission and receiving with acoustic signals, in order to get my actual signal from my received signal I am using xcorr in matlab to find peak point of alignment and getting my ...
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What is Homodyne BPSK? [duplicate]
Could someone explain what Homodyne BPSK is? What is a difference between BPSK and Homodyne BPSK?
I have read about this type of modulation in researches in optic communication. I surprised how phase ...
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Modulation in laser satellite communication
In small satellite communication technique we can use optical spectrum (optical (laser) communication system). The common and simplest modulation techniques used are On and Off
keying (OOK), Q-ary PPM ...
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At what bandwidth does BPSK become totally unreliable? [duplicate]
So I know that the baseband bandwidth of BPSK needs to be over 1/2 the baud rate, but I can't find any sort of graph that shows the increase of BER as the bandwidth falls below that, such as when the ...
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weird Demodulated BPSK waveform
I am using an acoustic wave of 3khz(audio BPSK) as my carrier frequency with a sampling rate of 10k samples per bit. at the receiver end, I play the audio from my phone to my computer, record it ...
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AWGN noise variance in upsampled BPSK signal
When I simulate BER for basic PSK schemes, I set the IQ complex noise variance to
$\sigma^{2} = \frac{E_{s}}{2*R_{m}*R_{c}}*\left( \frac{Eb}{No}\right)^{-1}$
where
$E_{s}$ = Energy per modulated ...
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Shannon capacity limit & FEC comparisons
In this figure from Fundamentals of Digital Communications by Madhow , pp 328 there is a comparison of a rate 1/3 turbo code with the shannon limit for rate 1/3 BPSK:
Trying to understand the limit ...
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How to find the bandwidth of the transmitted M-FSK signal?
I'm tried to find the solution, but I failed.
my question in the figure below, and the correct answer it's shown at the end of Figure.
I'm using this formula but the answer is not correct!
Is there ...
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Wrong number of samples per symbol for BPSK in MATLAB?
Goal is to achieve 8 samples per symbol for BPSK signal. After analyzing the plot of below code, IMHO its not 8 sps, I am right? If yes what I do wrong?
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Create a Range Doppler Map using "Arbitrary" phase coded Waveforms
This is my first questions I am asking to this community!
I want to understand how to create a Range-Doppler Map (RDM) for a phase/frequency coded radar return using an arbitrary waveform generator (...
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Audio signal arrival timing, impulse response, and reverberation
I'm building an application that requires determining the arrival time of an audio signal with a very high degree of accuracy (within 1ms would be ideal) using commodity smartphone hardware. I found ...
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bpsk demodulation only with STM32
for an internship I have to create a communication between 2 devices at 30Khz.
we choose a BPSK modulation.
I create du Tx with a stm32 and a DDS (AD9834).
Now I trying to code the demodulation with a ...
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power spectrum of passband of ofdm is it right shape or not?
I tried to get power spectrum of ofdm passband signal.
Below is the whole matlab code for that with BPSK+ofdm.
and I got the power spectrum as below.
I wonder that is that right form or not?
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Phase correction algorithm: minimisation phase error
Thank you for your participation in my discussion in advance.
I am working on the implementation of a phase correction.
Currently, I have finished the algorithm. I think it is a standard algorithm ...
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Design a timing recovery algorithm with predefined samples with max amplitude
I need your help in understanding how to simulate a timing recovery algorithm. I have already read a lot of literature and posted here the question but I have still doubts how it works.
Let me briefly ...
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Discussion of simulation results of a signal sequence: amplitude
I need your help in understanding if the simulation result is correct.
I have simulated a random BPSK sequence that was upsampled and filtered with a raised cosine filter.
The length of the filter is ...
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Error probability for 8-PSK
How can I calculate bit error rate for 8-PSK modulation when I have $E_b/N_0$ given? I know that for QPSK/BPSK the matter is quite simple, but I cannot cope with 8-PSK.
Let's say that my $E_b/N_0$ = ...
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Correcting large frequency offsets at very low data rates
Consider a typical BPSK system running at a baud rate of 1 kbaud/sec - the receiver needs to deal with severe frequency offsets, let's say up to +/- 1 MHz offset and that the frequency offset can ...
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Block diagram of M-PSK modulation and demodulation
I have come across this quadrature modulator block diagram in many books and websites:
I've read that the quadrature modulator allows to realize many different digital modulations, including ...
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What is conceptually happening in this modulation function?
I know this is a programming question but i am trying to understand the logic of this. I have come across below function which is basically written in the groovy, ...
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How to design a cosine filter for bpsk using liquid dsp?
I was trying to build a (B)PSK-63 modulator as my hobby project.
Here is my code and the link to specs:
How to modulate PSK63 with liquiddsp?
Now it is working, but since I am using a NCO to shift the ...
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How to modulate PSK63 with liquiddsp?
I am trying to implement the BPSK-63 modulator using liuid dsp library.
Here is my code:
...
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Demodulating a satellite BPSK signal
I am currently working on a BPSK demodulator and decoder for a satellite communication system using GnuRadio.
The system uses a BPSK modulation at roughly 2GHz with a symbol rate of 200 ksymb/s. I ...
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Non Coherent BPSK with no Channel State Information at the receiver
Where or what is the proof for the failure of BPSK in fading channel when we have no knowledge of the fading coefficient $h$ at the receiver in the equation $y=hx+w$, where $x$ is BPSK symbol equally ...
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What is the unit-power information signal?
I am learning signal processing for my subject and have some problems with the unit-power information signal. I refer to this paper: https://arxiv.org/pdf/1906.03949.pdf
In this paper, they formulate ...
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How to Tx CDMA signal physically using an existing point-to-point modem? [closed]
I am working in acoustic communication, I want to test CDMA network capabilities in acoustic environment. I had an acoustic modem that has serial interface, a WHOI micromodem.
How can i serialized ...
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Cross-correlation with SDPSK modulation
I'm trying to detect a sync word in a signal using Symmetrical Differential PSK (bit 0 = +90° phase, bit 1 = -90° phase).
Given the signal is encoded in the phase difference between two symbols, the ...
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What channel model to choose while simulating a system in passband with frequencies over GHz range?
I was wondering as to what kind of channel model do we use to test for BER vs SNR in a passband RF system. The system that I designed is basically a wideband frequency hopped OFDM system where I use ...
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How to find the noise power in my simulation
I am currently working a tricky communication chain that I want to simulate into Matlab.
The chain is like a classic BPSK modulator/demodulator chain, but where the BPSK modulated signal has been ...
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A Practical Method for Correcting Phase Errors in a Transceiver System Comprising of OFDM + DUC and DDC
I am back with a question related to my OFDM Transceiver System that I am designing where I use DUC and DDC. I could get rid of the high BER problem. I realized that the problem was due to the phase ...
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How are pulse trains generated in a radio transmitter?
When simulating a PSK signal in MATLAB or Python, I often create an impulse train where each impulse is modulated with a symbol. This modulated impulse train then passes through a pulse shape filter ...
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How do we know the receiver delay in an OFDM transceiver system?
I was simulating a simple OFDM transceiver system without a channel (just the transmitter and the receiver directly connected). I saw that if I use the "Find Delay" block in Simulink between the ...
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Designing a PI filter for a Costas Loop
I am currently trying to implement a Costas Loop in order to demodulate a BPSK signal. Here is the reference block diagram I have been using to design the loop:Costas Loop Block Diagram
I originally ...
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Modulation classification via demodulation confidence?
I'm not sure if this is the right place to post this question, but will try anyway :-)
I recently started reading up on the field of automated modulation classification (AMC) where an algorithm ...
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