Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [bandwidth]

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

The bandwidth is typically measured in hertz, and may sometimes refer to passband bandwidth, sometimes to baseband bandwidth, depending on context. Passband bandwidth is the difference between the upper and lower cutoff frequencies of, for example, an electronic filter, a communication channel, or a signal spectrum. In case of a low-pass filter or baseband signal, the bandwidth is equal to its upper cutoff frequency. The term baseband bandwidth always refers to the upper cutoff frequency, regardless of whether the filter is bandpass or low-pass.

Extracted from Wikipedia:
1. Bandwidth

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What is the bandwidth of product of two signals?

For signal $x(t)$ with bandwidth $B_x$ and signal $y(t)$ with bandwidth $B_y$, what will the bandwidth of the signal $z(t)=x(t)y(t)$ be?
j.e.rogers
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How to calculate bandwidth of a wire, "air" or other channels?

I'm really curious of how engineers identify what is the frequency range that could be sent through "wire" as channel? Do they put wire in front of them and make test that consists of sending sinusoidal signals through it by gradually increasing…
Krushe
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Is the constant signal $x(t)=1$ bandwidth limited?

A quick question I was asked by a friend for homework. We have an LTI system and we needed an example for reconstruction and such... Anyway, he asked me if the constant signal is bandwidth limited. Since the Fourier Transform of a constant is…
Ben Shaines
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"Capacity" concept in Shannon Theorem

I have a question about the Shannon Theorem. According to this theorem the maximum capacity of a link can be calculated with the formula: $$C=B\log_2(1+S/N)$$ where $B$ is the bandwidth and $S/N$ is the signal to noise ratio. But I am not very sure…
Rodrigo Serna Pérez
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What is the definition of the bandwidth of a signal?

I was reading over the famous Nyquist–Shannon sampling theorem and I was trying to understand what the term bandwidth meant rigorously (exactly) with no ambiguity. In this site the define it as follow: 2) Bandwidth is the range of frequencies --…
Charlie Parker
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Difference between the use of 'bandwidth' in DSP and computer networking

As far as I know, bandwidth is measured in herz or 'radian/second' in digital signal processing or in analog communications. But in computer networking it is measured in 'bits/second'. I don't get how these two are related. Can anybody please help?
spectre
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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 frequency range or I think it's the same as frequency…
Colin Jack
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Bandwidth of an energy signal

I'm studying for my midterm , and I'm struggling with finding bandwidths. I have this energy spectral density : $\Psi(f)= { 1 \over \sqrt { 1 + ({f \over B }) ^2} }$ , and I need to find the $3$ $dB$ band and the band with $90%$ % power.…
Joao Reis
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Bandwidth of a composite signal

How to find bandwidth of a composite signal that can be decomposed into five sine waves with given frequencies and having all peak amplitudes same ?
user1369975
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How to calculate data rate in ground to satellite communication

I want to calculate the data rate in uplink transmission from ground IoT device to satellite. Is it possible to calculate it with the traditional Shannon equation: $$R = B \log_2\left(1 + \cfrac{P\cdot g}{N_0}\right) \tag 1$$ where $B$ is bandwidth…
Henry Lu
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What is the Maximum Rate of Change of a BW Limited Signal

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 guarantee that the fastest possible rate of change…
EasyOhm
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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 bandwidth is calculated by the diversity of…
Abcd
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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 theoretical minimum system bandwidth required to detect R…
Noha
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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!
Laur155 155
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Why Shannon Theorem has nothing to do with frequency?

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 100 MHz to 120 MHz, another is from 1 GHz to 1.02…
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