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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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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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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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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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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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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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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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 ...
Jency's user avatar
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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 ...
xyzabc123's user avatar
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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 ...
Ahmed Waleed's user avatar
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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 ...
dsp_curious's user avatar
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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 ...
Sittin Hawk's user avatar
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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: ...
Xingda Chen's user avatar
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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 ...
Jose Antonio's user avatar
1 vote
2 answers
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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 ...
asiemasz's user avatar
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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 ...
jstraugh's user avatar
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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 ...
RomanPort's user avatar
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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 ...
Hodgson Tetteh's user avatar
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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 ...
Adil.Kolenko's user avatar
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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 ...
Adil.Kolenko's user avatar
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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 ...
Lewis Kelsey's user avatar
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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 ...
Hodgson Tetteh's user avatar
2 votes
1 answer
251 views

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 ...
Moses Browne Mwakyanjala's user avatar
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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 ...
Abdallah_98's user avatar
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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? ...
Marcin Puchlik's user avatar
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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 ...
John Chrysostom's user avatar
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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 ...
Seth's user avatar
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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? ...
agile's user avatar
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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 ...
Jang Lee's user avatar
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1 answer
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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 ...
AD23's user avatar
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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 ...
AD23's user avatar
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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 $E_b/N_0$ = ...
MagicMan's user avatar
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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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2 votes
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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 ...
MagicMan's user avatar
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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, ...
Jay Patel's user avatar
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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 ...
Jean Bodo's user avatar
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1 answer
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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: ...
Jean Bodo's user avatar
1 vote
1 answer
922 views

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 ...
valkyrie's user avatar
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1 answer
101 views

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 ...
Vageesh Dambal's user avatar
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178 views

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 ...
Jay Patel's user avatar
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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 ...
Signal's user avatar
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