Questions tagged [bpsk]
BPSK, a mechanism of modulation is expanded Binary Phase Shift Keying.
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Side Lobes with different power level in BPSK PSD
I determined the PSD of a BPSK modulated signal using the MATLAB pwelch function and default parameters. My code looks like the following:
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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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Rayleigh flat fading channel and pulse shaping
I'm trying to implement the Rayleigh flat fading channel in MATLAB using SRRC (Square-root raised cosine) pulse shape. The modulation scheme is BPSK. Here is my code:
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Is BPSK relevant, or does it even exist, in wireless data transmission?
I ask this question because it seems to me that if pulse shaping has been applied in the transmitter, the signal that is actually transmitted is not phase modulated at all, rather, it is amplitude ...
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Exactly when is pulse shaping applied in the radio transmitter, before or after modulation, and is it applied differently in BPSK, QPSK and 16QAM? [duplicate]
I previously asked at which stage pulse shaping is applied in a WiFI transmitter and my question was closed due to duplication. The answers I was directed to have only served to confuse the issue for ...
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Unable to discern between GFSK and BPSK
Greetings Forum!
I posted a question sometime back and got some relevant feedback on that question however I have now run into another issue.
I am using a radio to transmit a 2-GFSK waveform. I used ...
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Comparing communication systems with different modulation orders and code rates
I propose an end-to-end communication method in my research. The key part of the method is not the channel coding and modulation but we use them anyway. I am using 1/3 rate Turbo codes with QPSK and ...
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GPS Coarse Acquisition PRN Codes
Are the actual 1023 bit sequences for each of the 32 GPS satellites available to consumers? I found the IS GPS 200 but it doesn't list the entire sequences. Are verified sequences available for ...
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Detection problem with extra noise observation. Does the extra observations help with detection?
Assuming all “real” number, consider the detection problem of $x$ given $y_1$ and $y_2$ below
$y_1= x + n_1$
$y_2= n_1 + n_2$
where $x$ is either $+A$ or $-A$ with equal probability, and $n_1$ and $...
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QPSK implementation with 2 BPSK [duplicate]
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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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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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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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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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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Intersymbol Interference -- Root raised cosine filter redundant if doing impulse response equalization?
I'm implementing DBPSK (differential binary phase-shift keying) over audio (44.1kHz sample-rate) using software. Eventually I'll use multiple audio frequencies at once, so I'm using FFTs and inverse ...
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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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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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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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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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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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Meaning of AWGN complex and real noise under BPSK Decision Scheme
I'm currently studying error correcting codes and decided to replicate some common Bit Error Rate curves under BPSK modulation.
I initially had trouble to convert SNR to a Gaussian $\sigma$ because I ...
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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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How to find a know signal in another signal which contains other signals along with the signal i need in python
I am working on BPSK with sound waves a carrier waves.
Actually I am modulating my data with some known sync bits along with the information I need to send. So the things I will be having at ...
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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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How to set a Carrier Wave for DBPSK Modulators in gnuradio?
for a Project I need to build an Audio Modem in GNU Radio.
I decided, that it would be the best to use DBPSK Modulation, because that is fast and relatively noise resistant.
But as it seems, the ...
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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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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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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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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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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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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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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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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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Beginner BPSK demodulation question
I'm writing a simple application in Python that sends and receives data over binary PSK using audio signal. I used cos() for 0 and -cos for 1. On the receiver side I figured I can demodulate by ...
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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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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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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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