Communication Definition and 321 Threads

I have no idea where to put this and it isn't based on any theory's just common sense and is very simple If you get a tube and put a wire in it make it as long as you want to and to pass information simply move the wire back and forth as the whole wire is moving at the same time the information...

Is there a site which gives brief description and overview on this type of engineering? I searched google but was not able to get one giving the outline or brief introduction.

Homework Statement Hello, the plot in the image shows a modulated signal s(t), with one period of the modulating signal m(t). The mean value of m(t) is equal to zero . Its asked me to find the modulated index, the amplitude of the carrier, the equation of the message(m(t)) and the kind of...

Setting: 1) System should allow gov total surveillance of citizens (From the good side there would gov provided cloud computing, cloud storage and free WiFi equivalent for all. ;) ) Violent crime rate would be already low, the system is more planed for fighting tax evasion, suicide, wasting too...

Hi all, I'm an student of Physics so apologies if I'm just some silly questions here. The higher frequency bands typically give access to wider bandwidths (e.g wifi). Considering that higher frequencies bands (> 30 Ghz) are more susceptible to signal degradation due to ‘rain fade’...

I am trying to achieve real time plotting of accelerometer data using an arduino, an Xbee, and Matlab. Usually when the Matlab program gets data, it gets something like this: ~ #� ' X: -2 Y: 20 Z: 4080 t: 33232 ~ !� ' X: 4 Y: 2 Z: 4066 t: 33255 b~...

Hi, In all the discussions about EPR, Bell's inequality and interpretations of QM locality seems to be a property that nobody likes to drop light-heartedly. This is somehow understandable since SR is an extremely successful theory. But SR only says that we cannot transmit information faster...

Can two entangled particles communicate or tell the other particle which quantum state it sould go in if one particle is in a black hole and if so can they communicate if both are inside a black hole?

Studying about Communication Skills specifically about mobile handset and how do they transmit and receive signals etc. I came across this question which states "Why does a mobile phone handset have a tuning circuit for reception stage but not for transmission? The attempt at a solution I was...

Hi all, I was thinking about the problem and can someone verify my solution : 1) Set up a Magnetic field going from down to up, i.e north pole is at the bottom. 2) Use the triboelectric series to charge some small particle positive (hair or glass with teflon) 3) Throw that particle in forward...

I found the thread "SR, LET, FTL & Causality Violation", looked through through all of it and read large parts. I believe I found my answer there, but to make sure, I'm asking the question here: Suppose we had some "magical" black-boxes that allow us to communicate information in both...

Homework Statement I am currently embarking on a project where I have to build a communications system which can take in an analog voice signal, translate it into digital signal, and send it across to the receiver where the original voice gets recovered and it can be played back using a...

I am learning sky wave propagation and in my book, a relation between refractive index, dielectric constant and electro field strength is given. \mu=\mu_0\sqrt{1-\frac{Ne^2}{\epsilon_0m\omega^2}} Is this a form of Kerr opto-electric effect? How do you get this expression? If you think I cannot...

Let A= (sin(x) * sin(100x)) + sin(100x).; modulation index is 1; Let B= (sin(x) + sin (100x)); Both of these waves have same frequency and both are amplitude modulated. When passed through an envelope detector, both will give message signal. And B have an advantage of not having any sideband...

Homework Statement I am currently embarking on a project which requires me to design a system where I can transmit voice over a distance, by inputting an analog voice signal on one end and then recovering the voice which I input on the transmitting end at the receiving end. The general design...

Actually out of my personal interest to learn & upgrade my skills I have self volunteered self development of Photonics Simulation software on Python platform. I am basically a software developer. As such I seek some technical information for same related to its development activity. Can you...

Greetings, I am writing a paper for my university English class. The purpose of it is to recognize or acknowledge the amount of writing (or lack thereof) in our future career choice. As an Aerospace Engineering major, I want to find out if writing is a big part of Aerospace Engineering. I have...

So I noticed a mistake in the mathematical analysis in a paper and I want to propose the revised version. What should I do? I think it doesn't worth a journal since the revision probably only takes a page. Is there other ways of doing such revision? I have heard there is this short...

I am an EE graduate and I haven't had any pre-exposure to any signal analysis and communications course (I did mostly machines, power systems and control systems(where I have known about frequency domain)). I want to start learning about communication systems, from the early radios to the...

I have a question about quantum entanglement. If quantum entanglement can cause particles to travel through time and space does that mean we can use them to communicate with the future or past. Say I build a device on Monday that recives and transmits such particles would I be able talk to my...

I read that for VLC, they use toggling the LEDs ON/OFF to represent binaries. Why cannot we modulate the visible light like radio waves.

Homework Statement 2. Homework Equations 10 Log[10](g/mW)= GdBw The Attempt at a Solution I have attached a document of my approach to this question. I would like to know if my approach is correct? Thank you for your assistance

My best friend currently acts as a proxy to explain my ideas to other people, and he says that while my logic is generally correct, my premises and conclusions are difficult to connect because I don't stay on a particular topic easily during a conversation. This is partially because I pull from...

OK, just had a thought. And I would be grateful if someone could explain why this couldn't work:Place A is on a surface Place B in on the same surface but, say 10,000 miles away from Place A. Therefore communication between them is limited the speed of light . But what if, at Place A there was...

Homework Statement A white noise process W(t) with unity (N_0/2 = 1) power spectral density is input to a linear system. The output of the linear system is X(t), where X(t) = W(t) - W(t - 1) Determine the autocorrelation of X(t) and sketch it. Homework Equations Let τ denote a time...

Hey! :o I got stuck with the following exercise: There are three armies A,B,C. Between the armies A and B there is a mountain. Only A and B together can beat the army C. A and B can only comminicate with a pigeon. But it is not sure that the pigeon gets to the other side of the mountain...

I would like to know in the following equation (attached) how can I incorporate BER for BPSK? is BER the same as Rc? The equation is relation between SNR and sigma square.

I work as a project engineer of electrical equipment for substations. More and more I have to deal with the communication of these equipment with PLC and other equipments. But I really don't know much about this area. For example, we have Modbus, Profibus, IEC-61850... every now and then I have...

I will spare all the background, and simply as my question. Does anyone know of any current research being done on communication between universes in relation to multiverse theory? Laugh at you will at the concept. I am currently collecting data and baselines for evaluating occurrences, and...

Suppose I have a transmitter and receiver and my friend in the next room also has it. Can we both talk with each other with radio waves as we do in cell phone. I know we can't talk if he is several miles apart. But if he is just in the next room, can we communicate?

hello everybody, I will Study Engineering and I'm thinking to take your opinions in the major that i will study I'm Confused between communication and electronics engineering, mechanical engineering or civil engineering. I care about the job-market which one is the most requested ? . which...

Hello, I have an optional course this upcoming semester on "Electronics and Communication" for which the course syllabus is roughly: Field effect transistors, transistor circuits, Operational Amps, analogue to digital conversion (and vice versa), combinational circuits, sequential...

my question is about the no-communication theorem in quantum mechanics: Assume that i have a pair of entangled photons which are entangled on their polarization. also assume that i send one to alice and another to bob. and alice wants to send a message to bob. no communication theorem states...

Quantum entanglement is a concept that has captured my imagination and has intrigued me very much in the past few years in which I've become interested in quantum physics. Immediately upon reading about it for the first time, I realized that quantum entanglement could be applied in a new...

Well many people in this forum suggested me to improve my English in many of my threads. So I am looking forward to do that. Should i read the whole dictionary? Which books should i start reading? I am also weak in grammar. One more thing I am also bad in my English handwriting. Well I have 2...

Homework Statement Space probes communicate with controllers on Earth using radio waves. Suppose a probe has a radio-transmitter that operates at a frequency of 516.0 MHz when at rest relative to the observer. This probe is now wandering the solar system. The signal you pick up from the probe...

I tried testing the system and I’m not sure if the problem is with the xbee’s, the transmitting code, or the recieveing code. Before I post my code I will explain what we are doing with the signals. We have three analog EMG signals that will be sent serially through on xbee using an arduino...

I'm wondering whether or why quantum entanglement swapping or steering could or couldn't be used for superluminal communication. Below is a thought experiment. Setting aside the technological barriers do the laws of physics prevent this? On Earth Base Alpha: EPR Sources Entangle Numbered...

Recent experiments realized the thought experiment of Asher Peres on entanglement swapping. Here's the abstract. Couldn't Alice and Bob in the experiment receive information faster than light from Victor? Here's the set up...

what could be the attenuation for optical fiber used in fiber Bragg grating sensor with a operating wavelength of around 1550nm

What is the relation between the Energy (E), power (P) and transmission rate (R)?

Hi all, I am working on a project that currently uses an RS-485 network with up to 32 slave devices (pic18f's with various IO and a max 483 driver) connected back to a master PC. The system is running fine, but it could be better. The only time the master needs data from a device is when a...

Homework Statement On a HSDPA multicode peak rate of wireless communication Channel Coding rate: 3/4. How was the value 7.2 Mbps found using 10 codes of a 16 QAM modulation using signal processing path.Homework Equations Not sureThe Attempt at a Solution I feel bad in saying this, but I have...

First I didn't know where to open new tread, so I open hear, if I put in wrong section please teach me where is the write place. As amateur in Physics I saw somewhere that with scalar waves you can communicate in transmitter-receiver way of course if resonance between t-r is good. Can we, and...

Homework Statement I need some help understanding the following problem: A distant, advanced civilization wishes to make contact with us using neutrinos rather than photons as the transmitting medium to avoid problems of obscuration along the line of sight. Suppose they use an \bar{\nu_e}...

Hello, I'm currently working on the background for a science fiction collection of short stories I am working on, and communication by means of entanglement plays a big role in it, and I want to make sure that I get it right. So here it comes. As I understand it, particles can become...

Hi all, Okay, I'm writing this post keeping in mind that FTL communication (or even backward in time communication) are impossible. However, I fail to understand why this would be impossible using the delayed choice quantum eraser, so my question is: where is the error in my logic here...

Arnold, an in interview with Lui in Notices of the AMS, Volume 44, no 4, p432 says: "It is a far-reaching generalization of the well-known fact of the impossibility of acoustic communication in the even-dimensional spaces (for instance, in the “plane” world), while in our three-dimensional...

Here is the article: http://www.science.tamu.edu/articles/Texas+A%26M+Researcher+Helps+Discover+an+%22Almost+Psychic%22+Photonless+Communication Can someone explain how this differs from entanglement - is it as simple as these particles no longer have to be entangled to relay information...

I'm a programmer but weak on hardware so I'd appreciate your help. In a novel I'm writing there are about one hundred underground cities housing one million people in the US; the rest of our population is dead. Somewhat smaller percentage of survivors in Europe and Asia. We have several years...