# Questions tagged [bandwidth]

the difference between the upper and lower frequencies in a contiguous set of frequencies

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### 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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### 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....
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### 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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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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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### 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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### 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) ...
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### 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!
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### 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 ...
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### Bandwidth and probability of continuous signal

I'm a little bit confused as to how to calculate the bandwidth of a signal. A question has me believing that it is correlated with the probability distribution. I am however not sure of this. ...
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### Bandwith of a energy signal

I'm studying for my finals , and I'm struggling with finding bandwidths. I have this energy spectral density : Ψ(f)=rect(f) , and I need to find the bandwith, 3 dB band and the band with 90 % power. ...
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### What's the theoretical bandwidth?

A radio signal is sampled at $f_{s}=5512$ Hz, and $n=2^{14}=16384$ points are used in the FFT to display it as a spectrogram. The frequency resolution is $\frac{f_{s}}{n}=0.33642578125$ Hz/point, ...
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### duty cycle of a WiFi Packet

I am doing a simple over-the-air(WiFi 802.11a) test in a shielded chamber involving one Tx and one Rx (around 5 feet).. I need to find the duty cycle given the length of the payload (in bytes), MCS ...
I have an exam in the following days and i have no clue of what is the response to this question in the exam: given this signal: $$g(t) = H\left(t+\frac{T}{3}\right) f(t) - H\left(t-\frac{2T}{... 1answer 106 views ### sum of 2 signals I have 2 signals: x(t) and y(t). They have the same bandwidth B_x=B_y. But the bounds for the bandwidth are not the same. For example, B_x=f_{max}-f_{min} and B_y=g_{max}-g_{min} with f_{... 2answers 112 views ### How to generate random data with a specific bandwidth I generate some random data (bits, actually, using MATLAB's randi) and then I convert such bits to BPSK (1 and -1). After that, I use a RRC pulse (roll-off factor ... 1answer 324 views ### Do negative frequencies count towards null-to-null bandwidth? I am aware that negative frequencies do not normally count towards the bandwidth when transmitting in the baseband. However when specifically asked to look at the null-to-null or zero-crossing ... 1answer 2k views ### Relationship between signal rate, data rate, minimum bandwidth I need to understand the relationship between bit rate, signal rate and minimum bandwidth. I read in a textbook that We define three cases for relationship between bit rate and signal rate for ... 1answer 88 views ### Representation, Bandwidth and composition of Digital Signals I have started learning data communication and I'm not able to grasp certain topics. First (i) I know that analog signals are continuous and digital signals are discrete. Analog signal are ... 3answers 176 views ### Why bit rate is same in a lower frequency spectrum and higher spectrum? If there is a spectrum between 0 Mhz - 1 Mhz, bandwidth would be 1 Mhz here and for example with baseband we can send 2000 bps. What I can't understand is if spectrum is 5-6 Mhz instead of 0 - 1 Mhz, ... 1answer 1k views ### Nyquist Maximum data rate formula for PCM The Nyquist maximum data rate formula for a binary PCM is given by$$C = 2B\log_2L$$I'm not very sure what "B" is here. Is it the bandwidth of the signal being sampled or is it the channel ... 1answer 102 views ### Find Bandwith from Spectral Efficiency and Eb/N0 to give you a short intro of why I am asking here. My Uni is offering a TeleCom Lecture, I love the topic but all they teach is electronics, the exercise sheets are still TeleCom, we get no supporting ... 1answer 176 views ### Bandwidth of a finite impulse response filter In a machine learning application, a model learns to apply a filter h(n) via convolution to a 1-dimensional input signal s(n) (e.... 1answer 359 views ### Calculating Data Rate using Bandwidth, Transmission Power, Noise Power Spectrum Density and Channel Gain I'm a Software Engineering student researching on Load Balancing in IoT and I need to calculate data rate. However, I don't know how to use these values to attain data rate despite searching on the ... 0answers 250 views ### Notch Filter with given Bandwidth I have to use Matlab with the iirnotch()-function to design a notch filter. The notch should sit at 520Hz, the Bandwidth should be 100Hz and I have a sampling ... 0answers 30 views ### Binary Polar vs 4-PAM Signalling Why is binary polar signalling not feasible for a data rate of 2.0Mbps within a bandwidth not exceeding 1MHz? Is it due to the fact that binary signalling can only transfer 1 bit of data per symbol ... 1answer 160 views ### Appropriate channel bandwidth for my BPSK modulated Psuedo-Random code on direct conversion transceiver My hardware is an analog device SDR+Xilinx FPGA (sdr = fmcomms4-ebz). The direct conversion transceiver (ad9364) has a tunable channel bandwidth of 200Khz - 56Mhz. I am employing BPSK modulation on a ... 1answer 1k views ### QPSK Data Rate vs Bandwidth at Passband: Why can it only transmit 1 bit per Hz and not 2 bits per Hz? 1) This is a follow up question to the most up-voted answer to this question. 2) The accepted answer is that "QPSK transmits 1 bit per Hz at passband". 3) The theory found in books seems to agree ... 0answers 92 views ### Chirp resolution as a function of bandwidth My question concerns about the Chirp resolution during the crosscorrelation as a function of the sampling rate and available bandwidth. Suppose at a transmitter a chirp signal is transmitted (ranging ... 1answer 243 views ### How is frequency related to data rate? How does (if it does) frequency affect/relates to Data Rate. Why for example using the same modulation, LoRa (in the physical layer), you get somewhere around 250kbps at 2.4Ghz and only 20kbps at ... 1answer 396 views ### What is the meaning of inverse signal bandwidth? I have been studying the two ray model in communication systems. The text I'm studying has two signals, u(t), which is Line of Sight and u(t-t'), which is the reflected signal. It quotes, ... 2answers 779 views ### Noise power and bandwidth$$N=kTB$$In this formula for calculating noise power, why do we use the total bandwidth of the system? I mean our signal is at f_0 carrier frequency, why is it effected by a large bandwidth and ... 1answer 2k views ### Minimum Channel Bandwidth for PCM Please check if my answer to GATE IN 2010 question 11.20 is correct/can be improved upon. So, every \frac{1}{f_s} sec, a sample is taken. The signal amplitude is quantized into 2^n levels such ... 1answer 4k views ### Passband vs Baseband Bandwidth Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies. A key characteristic of bandwidth is that any band of a given width can carry the same ... 1answer 85 views ### Bandwidth of the Derivative of a Message [duplicate] If I have a message signal m(t) and it has a bandwidth B. I know that the bandwidth of m^N(t) is NB. But what is the bandwidth of \frac{d m(t)}{dt}? Thanks! 1answer 153 views ### Bounds of the difference of a bounded band-limited function For a continuous signal (function), we have Bernstein inequality :$$ |{df(t)}/dt| \le 2AB\pi $$where A=\sup|f(t)| and B is the bandwidth of f(t). The question is: is there a relationship ... 1answer 95 views ### What is an intuitive understanding of the difference between the minimum required bandwidth and actual bandwidth? When using for example, polar signaling of full width rectangular pulses, the bandwidth is equal to the pulse rate Rb, which is also the bit rate. B=R_b for full width rectangular pulses. But ... 2answers 794 views ### Quantization level versus bandwidth [closed] Why is it that increasing the number of quantization levels L results in an increase in the signal's bandwidth? 2answers 673 views ### Bounds of the derivative of a bounded band-limited function Let f(t) be a function with properties:$$\begin{array}{ll} t\in\mathbf{R}&t\text{ is in reals}\\ f(t)\in\mathbf{R}\text{ for all } t&f(t)\text{ is in reals}\\ |f(t)|<A\text{ for all }t&...
According to Shannon theorem $$C= B \log _2(1 + S/N)$$ My question is, why there is no frequency in this formula? Let's say we have 2 channels, both of them have same 20 MHz bandwidth, one is from ...