Questions tagged [communication]

Exchange of information between devices. Communication can be wired or wireless.

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Data Transfer Between Two Microcontrollers

I'm working on a project for my university, that requires digital data to be send from one dsPIC to another and after some processing, the second microcontroller sould send the reusult back. Is there ...
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3answers
44 views

I/O Board accepts “5V TTL, open/closed circuit” - So it will accept the closing of a circuit with no voltage?

A digital I/O board has the following pins: Digital In Pin 1 Digital In Pin 2 Signal Ground Digital Out Pin 1 Digital Out Pin 2 I am interested on how inputs into this board can be made. Its ...
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11 views

Sercos Bus Monitoring

I want to monitor traffic on a SERCOS bus that is controlled by a Schneider/ELAU C600 PACDRIVE I have a profibus port on the C600 but don't want to impact scan time. Is there a device/Gateway that I ...
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1answer
28 views

BPSK and QPSK's BER( In the case of coherent carrier)

In BPSK signal coherent demodulation, if the recovered coherent carrier has a static phase error of 10 degrees, how many DB does the BER performance of the system decrease? The degradation of BER ...
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97 views

SPI data lines look identical, but results are different, how is that possible?

I have a golden sample system which consists of 2 devices communicating via SPI. I swap one of the devices and bit bang the SPI to make it similar to the golden sample. However the bit banged device ...
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1answer
53 views

How is data transferred through wires? is it [5,0] volts (DC) or is it [1,-1] volts (AC)?

So basically I am learning about how data is transferred through wires for a networking course and I stumbled upon this Ben Eaters video on this topic and I got a bit confused because I know that ...
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0answers
25 views

Choose between Profibus PA and DP

I currently try to understand a new technology: Profibus, until now I worked with HART, with which I also had some struggle in the begging but now it's clear. I try to understand why in a factory is ...
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2answers
101 views

Adding harmonics to the square wave means

I have generated two imperfect square waves by: Adding fundamental frequency with 10 odd harmonics. Adding fundamental with 20 odd harmonics. What difference should I observe between two imperfect ...
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3answers
94 views

Is there a standard way to probe SPI without causing data corruption?

When I connect my oscilloscope probes to my SPI lines, the line voltages get affected a lot and so my SPI comms fail. I am using a breadboard as an intermediary between the two devices and adding ...
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1answer
49 views

How does DPSK work? What are the advantages compared to BPSK?

I have two questions that I would appreciate some help with. Comparing BPSK and DPSK I noticed that BPSK has lower BER. Why is this? Are there other advantages of using one over the other? In what ...
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USB vs Bluetooth power saving

I need to transfer almost all kinds of data (arrays, video/audio stream, control signals) between mcu and an Android smartphone. MCU will accumulate data from smartphone and further send it by other ...
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2answers
40 views

A question about serial communication and received buffer

Using my own program in PC side, I am polling data from a device in half duplex way(like in old walkie-talkie style) through USB port. This is serial communication (Baud rate is 9600 bits/s, 8 data ...
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2answers
69 views

Testing serial communication programming

I have made a user interface program (with buttons, trackbars, etc.) for Windows (using .NET C#) where one talks to an embedded device (an ARM uC) through its RS232 port and I use a RS232-USB ...
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1answer
42 views

Can a non-modulated / continuous carrier be heard in Superheterodyne receiver? Why do we need BFO?

I think a continuous carrier be able to heard in a super-heterodyne receiver, since it has it's own oscillator. Why do we need BFO then? What's the difference between the two? So, morse codes would ...
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5answers
304 views

What are the applications of the Fourier transform in communications?

I have learned about the Fourier transform, but I do not have a deep understanding of it. I heard that it is used in radios, butI don't know how and why. Can anyone explain it in a very detailed ...
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4answers
94 views

Difference between master and slave devices in communication network

I am a rookie in network engineering and what I don't understand is the master-slave communication. According to Wikipedia,'Master/slave is a model of asymmetric communication or control where one ...
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2answers
47 views

Antenna gain & link budget

In an ideal world, if the transmitter is outputting 30dBm to an antenna with 100% efficiency with 10dBi of gain. The receiver has an antenna with 0dBi of gain (100% efficiency as well) and is sitting ...
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6answers
732 views

How to stream data from embedded system to PC fast?

I'm working on an embedded system which will generate data at a pretty high rate, 100-300Mbit/s. This is coming from a bunch of SPI busses. I need to get this into a Linux PC. What's the best way to ...
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3answers
57 views

Smart phone USB-C Data and Power

I have a Samsung Note 9 with a weird technical issue that has to do with usb standards. If I plug in the phone to a PC using a USB-C to USB-C cable, the phone will charge and transfer data to the PC. ...
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1answer
48 views

8Mbps power line communication with PLC \ Homeplug

I'm trying to design a circuit to transmit data over the power lines. The data I'm trying to send is real time FFT of about 100k samples per second, for 32bit data this comes to about 3.2Mbit data per ...
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1answer
66 views

Communication protocol for microcontroller to PC host [closed]

I am looking for a reliable serial protocol that can be used for communication between PC host and a MCU programmer. Currently I've devised a prompt-like protocol, which has been great for testing, ...
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2answers
56 views

What's the relationship between bandwidth and symbol rate for a modulated signal?

I was hoping somebody could help me with understanding the relationship between the bandwidth of a modulated carrier signal (say using QPSK) and the symbol rate(s) you can transmit across a channel. ...
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2answers
207 views

Help with interpreting this manual using hexadecimal message

There's a device which I want to control by sending telegram and it has no online manual: --to be updated the whole manual file here-- The physical layer defined with no parity at the first page. But ...
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0answers
47 views

How does BICM work?

Can someone explain bit-interleaved coded modulation (BICM) in plain language, focusing on the practical mechanisms and properties rather than the deep analytical details? I found a few papers and ...
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2answers
536 views

How can I make a UART receiver using logic devices (74164,counters,logic gates,..)?

I am trying to make a Serial-in Parallel-out Register to be controlled by my PC with logic gates and a 74164, 74193, 555 timer. I am programming it through visual basic and I have no problem making ...
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0answers
56 views

A low latency wireless communication link

At this moment I'm working on a wireless charging system where feebback (error for PI controllers) is being send by the nrf24l01 modules. I have implemented 2kHz communication link. Can anyone suggest ...
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1answer
42 views

What is the derivation for shot noise current?

The screenshot is taken from Principles of Electronic Communications by Louis E. Frenzel Jr. I don't know where the formula came from and I tried searching, but couldn't seem to find any that I ...
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1answer
50 views

What is the correct terminology usage regarding “downconversion” and “correlation”?

I've recently taken a digital communications course. To provide some background to my question: In passband, it was explained that the incoming signal r(t) is "split" into different channels,...
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1answer
27 views

Is spatial multiplexing always required to define MIMO?

From Wikipedia: In radio, multiple-input and multiple-output, or MIMO (/ˈmaɪmoʊ, ˈmiːmoʊ/), is a method for multiplying the capacity of a radio link using multiple transmission and receiving antennas ...
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1answer
68 views

What really limits off-chip I/O? Capacitance or Inductance?

To my understanding, the crucial limiting factor for off-chip I/O is bondwire inductance, something that seeks to be minimized with BGA, flip-chip bonding etc. The rationale is that an RC wire model ...
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1answer
67 views

What is the power spectral density of a DC signal?

I am trying to find the Esd and psd of a pure DC signal, but I am stuck at integration of a square of Dirac delta function.
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2answers
95 views

3G, 4G, 5G and 6G simple differences [closed]

Seems like a simple question but I've searched and not found good answers. It comes down to signal to noise ratio equation. What are the differences between the generations in terms of: Frequencies ...
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0answers
68 views

Amplitude modulation with JFET

I have found a circuit that does AM modulation with a JFET transistor(2N5485.) I modified it slightly and ended up with the circuit below. A sample output is also given. I used Microcap 12 for the ...
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1answer
80 views

Could power cycling a modem 24 times a day for over 3 years (>30,000 times) cause the modem to lose its settings? [closed]

Could power cycling a modem 24 times a day with it being on for 10mins at a time for over 3 years (>30,000 times) cause the modem to lose its setting and revert to factory? This modem.
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3answers
61 views

QAM modulation and link to AM, ASK, PAM

I am a bit confused about QAM modulation. In wikipedia, I found this: It conveys two analog message signals, or two digital bit streams, by changing (modulating) the amplitudes of two carrier waves, ...
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24 views

Pulse-Amplitude Modulation minimum clock frequency

Below is the question and answer: Source: Study Guide for Fundamentals of Engineering (FE) Electrical & Computer CBT Exam- Third Edition By Wasim Asghar, ISBN:9798670880909 However, as per the ...
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1answer
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what is the architecture of a wireless communication? Please explain patiently [closed]

Orthogonal Frequency Division Multiple Access (OFDMA) and Frequency Shift Keying(FSK). Hey, I'm extremely confused with the gigantic number of modulation schemes out there. Please help. I understand ...
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0answers
38 views

FUSB302 - Two devices, transmission between them

I have controller device with a FUSB302 Programmable USB Type-C Controller with PD for power detection for charge battery. I want to make a subdevice to emulate my own hardware. I know that FUSB302 ...
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2answers
72 views

Is interleaving used in MIMO?

Correct me if I'm wrong, this is my understanding of MIMO: Is this how MIMO is able to increase data rate?
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1answer
82 views

How does MIMO increase data rate?

I understand how using multiple antennas helps improve reliability as it combats multipath propagation through redundancy. But how does using multiple antennas increase data rate?
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2answers
119 views

AM Demodulation MC1496

I am trying to analyze the demodulator product detector circuit. This is done by the IC called MC1496, I find its datasheet, this circuit is in page 10 and the link is : https://www.onsemi.com/pub/...
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1answer
83 views

Colpitts Oscillator - Supply/Output Voltage

I try to simulate Colpitts oscillator but i got stacked about one thing. When I simulate this circuit, the output Vpp is 24 V in other words, it oscillates between 0 V and 24 V. The question is, we ...
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1answer
20 views

What is the difference between circuit switching vs virtual circuit switching data communication?

The circuit switching method of data transmission which was used traditionally is way too similar to the virtual circuit switching (packet switching) communication technique. What is the difference ...
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0answers
50 views

MSP430 UART Reading

I'm trying to transmit and receive data between Arduino Uno and CC430. There is no problem with sending data from CC430 to Arduino Uno. I can receive the data on Arduino side. Also I can transmit the ...
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6answers
136 views

Why are transmitting antennas generally larger than receiving antennas?

The reasons I can think of are transmitting antenna has to be more directive also larger length will imply larger power and thus will help compensating for losses. But on contrary if receiving antenna ...
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25 views

Push to talk (PTT) to Bluetooth intercom system

I want to build a push to talk button or a workaround for similar implementation to an existing Bluetooth intercom system. It is a Bluetooth headset from Schuberth (SC1M) at one end and a Pelstor ...
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1answer
57 views

How can I let 2 devices take turns accessing a SIM card?

I need to store data in a sim card using one device, then another device needs to access that data. They do not ever need to use it at the same time. A question was asked about this a few years ago ...
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16 views

Why use both packet detection and symbol time estimation in the receiver of WLAN(WIFI) in 802.11

n IEEE 802.11 Wlan, at the receiver side, we first use packets detection algorithm to detect the start of the packets, and then uses fine symbol timing estimation algorithm to find the start of the ...
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1answer
26 views

Data rates for each user in ADSL with discrete multitone technique

I read about MODEM technology from Forouzan's 'Data Communications and Networking'. Under ADSL technology it was said- The modulation technique that has become standard for ADSL is called the discrete ...
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1answer
111 views

CRC calculation

I have been attempting to understand the CRC calculation. I have found online CRC calulator and I have done an experiment. I have tried to calculate with this calculator the CRC16-CCITT (in the ...

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