Questions tagged [bandwidth]
the difference between the upper and lower frequencies in a contiguous set of frequencies
211
questions
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1answer
49 views
Why is the bandwidth of each ZigBee channel in the 2.4GHz frequency band 2MHz, while the sampling interval of the ZigBee receiver is 0.5us? [duplicate]
From the Wikipedia, the XBee paper, the BlueBee paper, and the WeBee paper, I learned that:
In the 2.4 GHz band, the bandwidth of each ZigBee channel is 2 MHz.
For receiving a signal over one of ...
2
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1answer
39 views
Requirements on Signal Spectrum for Fractionally Spaced Equalization
I'm constructing an ultrasonic communication system and I am struggling with the correct parameters for my receiver.
In baseband, my channel input signal $x(t)$ has infinite bandwidth, since I use a ...
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0answers
25 views
Which conditions must fulfill a time-limited signal (so of unlimited bandwidth) $f(t)$ to have a bounded maximum slew rate?
Which conditions must fulfill a time-limited signal (so of unlimited bandwidth) $f(t)$ to have a bounded maximum slew rate?
I want to know about which conditions must fulfill a real-valued time-...
0
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1answer
228 views
Relationship between sampling rate and bandwidth in gnu radio
I wondering something. While working with adalm pluto sdr in gnu radio, the sample rate I enter in the source block is actually bandwidth. I know that bandwidth must be half of the sampling rate ...
2
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2answers
71 views
Consideration about the choice of the radar operating bandwidth
I'm writing an essay about imaging radar.
I was wondering the possible consequences that the bandwidth at which the radar operates could have on the measurements, and therefore on the image.
One ...
0
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1answer
96 views
Limiting Bandwidth for QAM and OFDM signal in MATLAB Simulink
currently im creating an application capable of generating QAM and OFDM signal to be transmitted using SDR.
The whole application is implemented in MATLAB Simulink using only code generateable ...
1
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0answers
59 views
Super resolution for narrowband signal
How effective it is to apply super resolution techniques (like MUSIC, ESPRIT) on low bandwidth signals for indoor (BW=30Mhz) and outdoor (BW = 1MHz) location estimation?
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2answers
42 views
What is the Maximum Rate of Change of a BW Limited Signal [duplicate]
If I have a signal that has a max amplitude of 1 and is BW limited by filters to 10Hz-1kHz spectrum. I do not know what the fft/spectrum shape of the frequency looks like and it can change. Is it a ...
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2answers
127 views
How is it that a dial-up modem can achieve 33.6Kbit/s with only 3100Hz of bandwidth?
My understanding is that plain old telephone service passes frequencies between 300Hz and 3400Hz. How is it that a V.34 modem in the late 90s would be able to achieve data rates of 33,600bits/s with ...
0
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1answer
57 views
Signal to noise ratio (SNR) of a CW signal
I understand the formula SNR = 6.02N+1.76 for a N-bit ADC which quantizes a modulated tone sampled at twice the BW. I am trying to understand what the same equation would be for a unmodulated CW tones ...
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0answers
33 views
implmentation of FFT using lower N point
I have random data which was generated using randi funtion of 1024 bits..
I will modulate this using QPSK and will pass through 512 point IFFT..
While doing reverse process, I want to use 256 point ...
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4answers
122 views
Meaning of frequency and bandwidth of a signal, despite the fact that we do not know the signal
First of all, I am completely new to the domain of signal processing.
As far as I know, a signal can be represented with an infinite integral of infinitesimal complex exponentials, which is known as a ...
0
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0answers
23 views
From Delay Spread to Coherence Bandwidth?
The phase difference of two sinusoids is given as:
| TX --(r)--->RX <------- (Reflection)|
d: whole path from sender to reflecting object
$ \Delta \theta = 2 \pi \cdot \frac{(2d - r)-r}{c} f + \...
1
vote
2answers
314 views
OFDM use a pulse shaping filter or not?
I've heard in various literature that band limited channels use pulse shaping filters. By the way, In OFDM it use a cyclic prefix to overcome ISI, so I wonder if OFDM does not use pulse shaping filter....
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0answers
21 views
Are the SNR, Data Rate and Delay values correct in the below calculation?
I have these values:
power_received_from_one_subcarrier = -80 dBm
bandwidth_for_one_subcarrier = 180 KHz
noise = -109 dBm
When using {/, *}, the dBm values are ...
2
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1answer
75 views
Bounds of higher order derivative of bandlimited signals
Here is a bandlimited function f(t) with bandwidth Ω:
The function f(t) is bounded in [-A,A].
Then the bound of the derivative of f(t) is bounded as:
|f'(t)|≤2πΩA.
So, what is the bound of its n-th ...
5
votes
2answers
152 views
How can I experimentally find the bandwidth of my PLL?
I recently designed a phase-locked loop. I would like to quantify its bandwidth so that I can better understand it.
However, I made this bandwidth in an informal manner due to my lack of formal ...
0
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1answer
52 views
Time domain representation of a modulated signal when symbol rate >> carrier frequency?
I need to understand the relationship between carrier vs. bits with PSK modulation, and what the signal in the time domain would look like if my symbol rate is far greater than my carrier frequency. ...
0
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1answer
37 views
Aliasing Issues in Sub Band Coding
The general structure of Sub-Band Coding (SBC) is shown below:
The diagram shows that after each of the analysis filters, decimation is performed by a factor M which corresponds to the number of ...
1
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2answers
906 views
Minimum sampling frequency, quantization, and bitrate calculation
An analogue sensor has a bandwidth which extends from very low frequencies up to a maximum of 14.5 kHz. Using the Sampling Theorem what is the minimum sampling rate (number of samples per second) ...
2
votes
1answer
218 views
Bandwidth of PSK modulated signal
What does it mean that the bandwidth of PSK modulated signal without applying any filtering or shaping of the pulse, is equal to the sampling rate with "1st lobe" equal to two times of ...
1
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1answer
137 views
Spectral properties of QPSK modulation
From what I've read, the spectral properties of the modulation largely depend on the rate of change of the signal phase - "a signal in which the phase changes stepwise has a broad spectrum, well ...
1
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1answer
62 views
Calculating transmitter power from spectral density
I want to find out what is the real transmit power of my USRP 2922, unfortunately the only results I get when looking at the spectrum analyzer is the spectral power density.
These are the results of ...
0
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1answer
147 views
Calculating $E_b/N_0$ from given SNR ratio
I have the following formula:
$$\frac{S}{N}=\frac{E_b \cdot R_b}{N_0 \cdot B }$$
Where $S/N$ is of course SNR in dB, $E_b$ is energy per information bit, $ R_b$ is information bit rate in [bit/s], $...
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0answers
37 views
Transceiver for TDoA measurements
Could someone advise me on some module for making the TDoA position system for my research work? I need to have measurements with an accuracy of a few meters. It equals a bandwidth of about 20 MHz. I ...
0
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1answer
98 views
LoRa sensing using USRP GNURADIO
I made a simple RF sensing using USRP N210. I am trying to detect LoRa transmission.
A LoRa Node is operating at 915 MHz with Spreading Factor 8 and bandwidth 500 kHz.
I have used a USRP UHD Source ...
0
votes
1answer
189 views
How do we calculate bandwidth from signal formula?
How can we calculate the bandwidth of distinct signals like this?
I guess the right answer is 90 - 10 = 80 Hz. But I have a hard time understanding why is this calculated in that way. I thought the ...
0
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1answer
36 views
how sinc pulses can be used to distinguish different symbols
Let's say we want to transmit a sequence of numbers Using PAM, this sequence is transmitted with the signal $s(t)$
The pulses in $s(t)$ are transmitted at a rate $R_p=\frac{1}{T_p}$. This is called ...
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0answers
22 views
Determine the change of selectivity
I've stacked on solving this problem and can't find an answer in the web, so I decided to ask a question here.
There are the problem:
Preselector of boadcast receiver contains of one oscillation ...
1
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0answers
158 views
Wideband FM bandwidth estimation
In the book Modern Digital and Analog Communication Systems by B. P Lathi, there is a section for the estimation of WBFM bandwidth. First, the staircase approximation of $m(t)$ is constructed by the ...
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2answers
348 views
Confused on Pulse Filter Bandwidth and Symbol Rate Relation
***Still need help in 2021 - not fully clear still on Jan 20th ***
I am confused about the relation between Sinc and Rectangle transform pair and how that relates the Bandwidth of Pulses, Bandwidth of ...
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1answer
55 views
Bandwidth of a bandpass signal
If the Fourier transform of an aperiodic continuous time signal has signal components between the minimum frequency w1 and the maximum frequency w2, but not all the frequencies between w1 and w2, is ...
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2answers
929 views
Find the Equivalent Noise Bandwidth
I have already asked (in another thread) how to quantify (specify) the window function I have created. One figure I need it seems is the Equivalent Noise Bandwidth (ENBW) Or Noise Equivalent Bandwidth....
2
votes
1answer
191 views
Es/N0 with roll-off
I was trying to figure out if the relationship between SNR and Es/N0 changes with roll-off factor.
$W$: RF bandwidth.
$B$: Base band bandwidth. $W = 2B$.
$E_s$: Symbol energy.
$P_s$: Symbol power.
$...
-1
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1answer
283 views
Why the bandwidth in frequency spectrum of AM wave is 2fm and not 2fc?
We know, the instantaneous voltage of AM wave is:
...
0
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1answer
43 views
the best pre emphasis for MMSE equalizer
The system consists of multiple low-pass filter and noise, $h_1$, $h_2$, $h_3$, ..., $n_1$, $n_2$, $n_3$, ...
At the transmitter, the power of signal is fixed; and at the receiver, MMSE equalizer is ...
1
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1answer
78 views
Bandwidth of a modulated signal in analog domain
If i am using QPSK modulation with data rate 4 Mbps with rolloff factor $0.5$, then the bandwidth will be symbol $\rm rate\times (1 + rolloff\ factor)$. So here it will be $\rm 2\ MHz\times 1.5 = 3\ ...
1
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1answer
82 views
What is role of BW and frequency in internet speeds?
First the bandwidth (BW):
It is the amount of data that can be transferred simultaneously.just like more no. of highway lanes so that many cars can travel side by side simultaneously.
Frequency
It ...
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3answers
82 views
What is the physical meaning of coherence bandwidth in mmWave massive MIMO channel?
I am doing some research about millimeter wave massive MIMO channel now.
We first take account about static MIMO channel, cause we only have SISO measurement system now.
We use scanner to move our ...
0
votes
2answers
69 views
Design and a notch filter using two Butterworth filters in parallel (MATLAB)
I am doing a project to filter out a 1kHz noise inserted to a 30sec .wav audio file.
To filter out the 1kHz noise, I am required to design using two Butterworth filters connected in parallel where ...
0
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1answer
124 views
Bandwidth and BER of FM0 encoding
What is the bandwidth (i.e., the lowest possible bandwidth) and BER for FM0 encoding?
To be precise, this is my example of an FM0 encoded waveform:
There is always a transition between each bit. For ...
0
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2answers
60 views
How come FFT window give half size frequency bands when filter can seems to have an infinite precision?
I don't really understand maths behind filtering but use it lot in music production and i'm a total newbie to DSP.
Usually parametric filters let you filter frequencies with a precision that seems ...
2
votes
1answer
242 views
Detection Bandwidth for Noise Power Calculation
I am trying to calculate the $P_{noise}$ in an experimental setup, such as given
below. The DUT is excited at a predefined frequency, $f$ , with
power $P_\text{in}$. The total power is measured by the ...
-1
votes
2answers
69 views
flat fading and Nyquist minimum bandwidth
For flat fading, the bandwidth of the transmitted signal must be less than than the coherence bandwidth of the channel, and no intersymbol interference (ISI) occurs.
Nyquist showed that the ...
1
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1answer
83 views
frequency band and Bandwidth
All I know so far is that frequency is how much a signal repeat it self in a given amount of time (usually one second), like shown in the following figure:
I'm confused with some concepts like ...
2
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3answers
450 views
Why we measure bandwith at -3dB?
To characterize a signal it's a common use to determine bandwidth at -3dB from the peak (half power). Also, filter's cutoff frequency is pointed at -3dB. Why we use this rule?
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1answer
801 views
How to generate IQ samples of a signal?
I am using a HW with LMS7002 RF transceiver chip. This chip takes IQ values as an input.
1. Can anyone point me to a sample IQ value generator? That I can use to test.
2. What will be the IQ values ...
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0answers
129 views
Calculating the power spectral density on a different bandwidth
Let us say I have the power spectral density for a given bandwidth F1 at a transmit power T. I would like to calculate the power spectral density for bandwidth F2 for 1) the same transmit power T
2) ...
0
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0answers
50 views
Bandwidth of a signal
Given a complex,with fmin<0(say -10) and fmax>0(say 30) what is the bandwidth of this signal.Is it form fmin to fmax ,or 0 to fmax?
Thank you!
0
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1answer
64 views
What is the unit for power spectrum of acceleration signals in log scale
I have a signal recorded by an accelerometer in m/s^2. It is basically accelerations over a period of time. I have calculated the power spectrum of the signal over in a certain frequency band and then ...
