# Questions tagged [signal-theory]

Anything related to signal theory, i.e. the branch of applied mathematics and engineering studying the properties of signals and the mathematical tools used to manipulate them.

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### How to construct a signal with only unit functions?

I don't understand the solution to this problem. How can I write a ramp function in the form of a step function?
24 views

### Cellular communications queuing

Not sure if this is the right place to ask but this is a homework question. Consider a base station in a cellular network. The base station has the resources to handle 7 calls at the same time. The ...
4k views

### Why do microwave ovens use magnetrons?

With a lot of advancement in solid state electronics and signal manipulation, isn't it easier to simply take high amplitude signals with frequencies near 1 MHz and multiply the signals using diodes ...
26 views

### Draw the graph of differential of the following graph

Is is like this? I think there should be impulse signal also in the graph am i doing wrong?
68 views

### Represent the given signal in mathematical form

Is this the mathematical form? I highy doubt myself $$-2r(t+3)+2r(t)+16u(t)-r(t)-2u(t-3)+5/2r(t-3)-5/2r(t-5)$$
45 views

### Draw even and odd parts of following signal

I think my odd signal is wrong because odd signal cannot be symmetric about y axis
40 views

### Calculating steady state output using Laplace transform

I've tried to obtain the the steady state output with the help of final value theorem and multiplication properties of Laplace transform.But I'm not sure whether I've solved the problem correctly or ...
47 views

### Confusion regarding step responses of integrator and differentiator?

I am using matlab to study about step response of integrator and also of differentiator using transfer function modelling technique But i have two confusion, one in case of integrator is that step ...
61 views

### Determine the output signal given the input and inpulse response

It's been a while since I've worked these types of problems, but I've been working out the following problem for a while now and can't figure out a few details: And here is the solution: ...
55 views

### Is diode reverse recovery time related to diode capacitance?

The title. Is there some relationship between the two parameters? For example, fast diode recovery time indicates low capacitance, or even farther, can one be calculated from the other? Thank you in ...
89 views

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### Minimum Shift Keying

"Overall frequency excursion del-f in MSK is minimum frequency spacing between symbols 0 and 1 that allows their FSK representation to be coherently orthogonal". What is meant by being coherently ...
728 views

### Do I need to maintain source of a signal till it reaches the destination?

If I send a signal through a wire having delay of 10ms, then should I need to maintain the source of the signal till it reaches the destination or can I change after, say, 2ms and send the next signal....
175 views

### Why can't all data be sent across 4 wires?

I am aware that USB uses a positive, negative and D+/- wires in order to transmit data. The twisted pair are used to negate the effects of interference and electronic noise. I also understand that a ...
26 views

### What is propagation delay in cmos nets?

I have read somewhere that signal travels as electromagnetic waves in wires near to speed of light. The signals are brought to destination by EM waves. Then what does electrons do? If signals travel ...
437 views

### Is there any relationship between frequency of signal and distance it travels?

I'm currently researching 5G technology. Many videos/articles on this topic claim that 5G is designed for communicating on lower distances (than 4G), because of higher (than 4G) frequency. So to build ...
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### Long Distance High Speed Wireless Data Transfer

What kind of device can I use to transmit data at a rate of 1MB/min up to a distance of 100 miles? If that's not possible, what's the farthest distance to which I can transmit the data.
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### Discrete time domain, Is cos(2n) periodic?

I have just started out learning the basics of discrete time. I would like some help to understand if cos2n is periodic or not. I know the discrete time formula for periodicity: x[n] = x[n+N]. I Also ...
118 views

### Time Reversal of a signal and convolution sum

Why do we often time reverse the impulse response of a signal while performing convolution sum?It can be done even without time reversing the impulse response. By time reversing the impulse response ...
87 views

### Why did my textbook use signal energy as a measurement of approximation error, instead of something else?

TL,WR: Why do we use signal energy as a measurement of an approximation's error, and not something "simpler" like the absolute value of the error? Background: I'm reading through my textbook for my ...
792 views

### How is “signal strength” characterized on a coaxial cable?

I've come across the Shannon-Hartley theorem, so I assume that a "signal" must have some notion of strength or "power" that can be referenced to some noise level (and whose power can be varied at the ...
2k views

### Through-Glass WiFi Antenna

I used to install a lot of in-car UHF radios & hands-free cell phone kits. I mostly worked on trucks & commercial utility vehicles fitted with bull bars, upon which I would mount a big, bulky, ...
592 views

### Solving Difference Equation Using Z-Transform

I was trying to solve a problem given in my textbook. I have attached the solution given in the book. I thought some modifications where needed to it and tried to solve in a different way. I ended ...
191 views

### Signal System Basics

This is a problem which was asked in paper recently. The final answer they gave was option(A). Since, in frequency domain we can multiply signals. I assumed option (A) and started drawing signals ...
38 views

### Modelling this differential ended system for SPICE simulations and grounds

Considering above illustration, imagine a voltage measurement by a voltmeter where the voltage is coming from a differential output device i.e a device which sends mirrored voltages according to its ...
2k views

### Wireless signal reflection/absorption on different materials

I'm trying to understand the characteristics of RF signals/waves in different environments. I am wondering if there is any data out there regarding how much a wireless signal reflect from an object or ...