Questions tagged [communication]

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

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Different types of RS485 circuits

I've seen in some schematics that the RX, TX, RE and DE pins are connected to VCC with a resistor. This is how the connection with the UART pins is made (see schematic below). In some schematics, ...
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2 votes
5 answers
359 views

Full-duplex communication between multiple microcontrollers in an enclosed system [closed]

I plan on creating a system with multiple microcontrollers which need to communicate with one another. All the microcontrollers will be placed inside a single enclosure, so no need for long distance ...
1 vote
1 answer
79 views

Feasibility of high-speed omnidirectional communication through infrared light

I am currently working on the design of a low-cost communication system based on IR LEDs and photodiodes for my research project. The goal is to transmit data with ~100ns pulses across ~0.5m distance (...
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3 votes
1 answer
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Can bits-per-symbol be increased by superimposing frequencies on top of one another, analogous to chords in music?

I understand how the number of symbols used can be increased with things like quadrature phase-shift keying or quadrature amplitude modulation, and so on. I have thought for a year that it would be ...
0 votes
1 answer
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Isolation voltage of common mode choke, if used as coupled inductor?

I have a project where I need a small coupled inductor for isolated low baudrate communication. The line is short and I don't really care if only half of signal goes through. I need it really cheap, ...
0 votes
1 answer
38 views

How is noise analysis done in practice

If we identify a signal as a Random Process how do we study it in practice, how to determine its characteristics such as stationarity(whether it is Stationary, Wide Sense Stationary or ergodic),how to ...
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How do I know if a max min function is convex?

How do I know if a max min function is convex and what are the possible convex optimization tools that can be applied for the following equation? Suppose we have N networks and K users and I want to ...
0 votes
1 answer
36 views

How do modulations depend on transmission media? [closed]

or how is transmission media affected by modulation? Is there any relationship?
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2 answers
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How does multiplying the modulated signal "AGAIN" by the carrier frequency transfer the spectrum back to its original position?

I have some trouble understanding the demodulation of a signal. SI understand how we multiply the message signal by the carrier signal then chuck it through a channel, but on the receiver side I don't ...
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1 vote
1 answer
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How can I write and read consistently in the W5500's registers using the EK-TM4C123GXL with SPI communication?

I used a modified code from an example for SPI communication "spiloopback" from Texas Instruments, where I tried to write data in the registers of W5500 and then read those data. ...
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Is it possible in Profibus DP that slaves can talk each other?

I could not understand what Profibus DP is. Is it only I/O system which is controlled with a PLC or is it a complete bus system which controls the data traffic? If the second, I would like to ask if ...
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0 votes
1 answer
101 views

STM32 communication between two uc [closed]

How can I utilize the I2C interface between two uc/dev boards to send and receive data and commands? For example, if the status update request is in uc1, I want it transmitted to uc2. So I have two ...
0 votes
1 answer
34 views

Can M-LVDS be used as bus protocol?

https://www.analog.com/media/en/technical-documentation/application-notes/AN-1177.pdf In the document, it states that CAN is robust but M-LVDS is low power alternative of that. However, I couldn't be ...
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4 answers
76 views

Isolated bidirectional data input/output

I am trying to work out how I could set up isolated bidirectional data input/output. So far this is my schematic but I still feel like its not going to work. is output MOSFET Q52/Q53 going to hold ...
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0 answers
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What is the maximum data rate of AS-Interface?

After online search, I could not find exact information except some marketing words. It is said that it supports up to 100m and can be extended up to 600m but there is no information of maximum data ...
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1 vote
4 answers
174 views

RX/TX communication LEDs

I need to indicate the RX/TX functioning using LEDs. Due to lack of space I was thinking about using bicolour LEDs. The question is: how fast will the colours be changing? Will it be visible? Or are ...
1 vote
1 answer
34 views

Received QAM symbol demodulation

We're using 64QAM with unit average power and gray encoding. The modulated representation corresponding to symbols : 1 => -0.923 + 0.659i 2 => -0.923 + 0.132i . . 45 => 0.659 - 0.659i . . ...
2 votes
1 answer
341 views

How to explain mathematically 2.4 GHz and 5 GHz WiFi coverage and maximum range?

The question is why 5 GHz has less coverage and more susceptible to attenuation in long range? How can we mathematically represent how many devices can be covered?
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2 answers
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Is it possible to use I2C fast mode+ with 30m cable?

I2C can reach up 1Mbps with fast mode+ and 3.4Mbps with High Speed mode. I just want to ask if it is possible to use 3.4Mbps mode with longer cable and what is the max. possible cable length.
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0 votes
1 answer
100 views

Are FPGA and PC communications possible without a microprocessor i.e. do all FPGA dev boards have processors in? [closed]

I am new to FPGA design. I have worked on a Zedboard, used AXI bus and developed IP. However, I am not clear on some of the basic things. I would like to learn the following questions. My sincerest ...
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-1 votes
1 answer
81 views

What communication protocols can I use with maximum 2Mbps, with simple a simple cable (two wires, unshielded, untwisted)? [closed]

I need to find a communication protocol/module (on market product) in order to provide M2M (max 64 devices) communication at a maximum rate of 2 Mbps and a range of up to 30 m. The cables/cable should ...
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0 answers
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Bit error probability for BFSK

This is an assignment question. What is the probability of bit error of a BFSK modulation scheme with transmitted energy per bit Eb , in a additive white Gaussian noise channel having one-sided power ...
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0 answers
24 views

What's the structure of an XBee signal in transparent mode?

I can't find this one anywhere. Does it only contain the message which needs to be transmitted? Does it also contain some address headers of the source and destination modules?
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1 vote
1 answer
58 views

Condition for multi tone AM for proper envelope detection

Given a multi-tone amplitude modulated wave as follows : s(t) = Ac[1+2kasin(w1) + kasin(w2)] cos(wct) where wc is the carrier frequency and w1 and w2 are the modulating frequency components. My ...
1 vote
1 answer
108 views

Using CAN with Teensy 4.1 is better than using RS-485 which requires extra converter?

I am using Teensy 4.1 and need to communicate with motor driver which supports CAN and RS-485. In teeny4.1 CAN is supported yet it requires CAN transceiver whereas if I want to use RS-485 I need to ...
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0 votes
0 answers
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Mesh WiFi ESP32-C3

I am referring to the internal communication example for ESP mesh from the last two weeks but I am unable to make connections between two ESP32-C3, one as the root node and the other as the parent ...
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0 votes
1 answer
65 views

AM demodulation circuit doesn't work

I'm designing AM modulation and demodulation circuits. The AM modulation works fine but when I connected it to the demodulator (I'm using envelope detection) the modulating signal changed to the ...
0 votes
0 answers
37 views

What is the difference between sleeve dipole and patch antennas, apart from ease of manufacturing and low cost? [duplicate]

Why are patch antennas used instead of dipole antennas? If we want our dipole antenna to be more directive ,we can add a ground plane that acts as a reflector or print the dipole on a substrate to ...
0 votes
0 answers
39 views

Manchester encoding where the initial state is low

Is this correct? I thought in Manchester encoding the 0's had to be high-low transition, even if the initial state is assumed to be low and 1's low-high.
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0 votes
1 answer
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Analog telephone circuit and TEA1062 [closed]

I am currently working on an analog telephone project. I have some questions. ICs and Central are below: Central: KX-NS500 (gives 28VDC) DTMF receiver: MT8870 DTMF generator: HT9200B MCU: ...
1 vote
1 answer
112 views

Is there a digital to analog converter module in network cards?

Network cards convert digital bit streams to an analog signal for transmission. Do they have a DAC module? If so, how fast is it?
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2 answers
79 views

CAN-Physical Layer PtP

In a current design i have to form a Point-To-Point communications link in an industrial environment. Based on some research and thinkering i came up with the idea to use a CAN-Physical layer for this....
0 votes
1 answer
80 views

Communicate with 256 nodes over over about 40 meters [closed]

I'm looking for a way to build an 8x8 RGB LED dance floor, each tile about 45x45cm. I was thinking of having each tile of the floor run its own small Arduino board to manage the LEDs and the input ...
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0 answers
101 views

AT+CNBP command for SIM8202G-M2 cellular module

I've been trying to setup this module on CM4 rasberry device. So far I managed to get it setup to boot with the system, the main issue here it only finds LTE network. I used AT commands in order to ...
0 votes
2 answers
97 views

Does a receiving antenna radiate the power received?

Let's consider the case of linear dipole antenna or Hertz dipole. I know that the antenna acts as a transducer and it radiates the E-M waves due to the acceleration and decelaration of the electrons ...
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0 votes
1 answer
101 views

Costas Loop QPSK/4QAM

I can use a Costas Loop, modified for QPSK/4QAM and recover the frequency and phase successfully when using a pattern of all 1s or all 0s or a pattern that is repetitive for each I and Q data rail (in ...
0 votes
0 answers
89 views

Data Read and Write from PCIE End-point (FPGA) to Root Complex (Xavier Jetson) physical memory

We have a PCIe connection between our Jetson Xavier board configured as RC and FPGA board acts as an EP. We write an application for a 64 or 32 bit physical address in memory. We are trying to ...
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0 votes
1 answer
58 views

EtherCAT Communication Testing

I am working on a device that uses EtherCAT. On one side, I have the standard EtherCAT Connector - an RJ45. On the other side, I would like to experiment with different connectors. For starters, I ...
1 vote
0 answers
56 views

How to utilize receive spacial beamforming to allocate beams to different transmitter?

Assume there are 2 Base Stations (BSs) each is equipped with \$M\$ antennas serving 1 User Terminal (UT) simultaneously. Say if the UT has 4\$\times\$4 Uniform Planar antenna array, which means it can ...
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3 votes
2 answers
140 views

Connect multiple devices with USB

Consider a setup with 1 "server" device and 4 "client" devices (all are SBCs with Ubuntu installed). I would like to connect the 4 clients to the server, using USB/serial. Ethernet ...
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0 votes
1 answer
58 views

How would you know if you could read/write from a port in any electronic device? [closed]

It's probably not the right forum to ask but this was the best one I could think of. If you know of a better forum let me know. Maybe raspberry pi or Arduino? It's very long winded what I'm trying to ...
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2 votes
1 answer
92 views

Is "unidirectional" compatible with "full-duplex"?

In UCIe whitepaper, there is one paragraph describing the lanes in a cluster, as below: The unit of construction of the interconnect is a cluster which comprises of N singleended, unidirectional, ...
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Comparing ST5 genetically designed antenna with a generic one - how do they fare?

I have been reading this paper. It describes an antenna generated by a genetic algorithm. I will not go in the detail of that. In any case, they say : ..., our evolved antennas demonstrate several ...
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1 vote
0 answers
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How should I understand this interpretation?

Studying spatial diversity in telecommunication engineering (Fundamentals of Wireless Communication, D. Tse and P. Viswannath), I read this paragraph. $${\text {In}}\,{\|}{\textbf h}{\|}^{2}{\text {...
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1 vote
1 answer
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Sliding window protocol

In the sliding window protocol when the receiver sends RRn to the sender the receiver's window is shifted to the right now starting at the n position correct? Suppose this is the window of the ...
1 vote
2 answers
360 views

PCIe End-Point configuration for communication with Root Complex

I have an ambiguity regarding the PCIe initial configuration which is performed by the root complex (RC) on the end-points (EP). Both devices have their own base address registers (BARs). The RC ...
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0 answers
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Help Deciphering Encoder Pin-Out After Differential Comparator Circuit

I am trying to interface a translation stage with a different non-proprietary motion controller. Trinamic's TMC4671 seemed appealing due to cost and functionality, especially the evaluation kit. ...
1 vote
3 answers
241 views

I2C high speed mode

I am working on a project which requires communication from a central controller and multiple peripheral sensors. Each sensor can push out data at a rate of 4-5KB/s(kilobytes/sec). There are 25-30 of ...
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0 votes
0 answers
27 views

Convolution between bit stream sampled by N number of samples per bit with a channel modeled as low pass filter

I generated a bit stream in MATLAB, from the transmitter to be convoluted by the channel I use MATLAB function "randi" between 0 & 1, so it generates random vectors of 0s & 1s and ...
0 votes
1 answer
103 views

How to get program file from PIC?

I want to get the program file in the pic 18F46K22 from an electronic PCB. There is no code protection or password on the PIC18F46K22. It is a simple card. Is it possible to connect to the card with ...
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