Questions tagged [communication]

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

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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....
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Dynamic routing how devices find their position in the network [closed]

Suppose we have a network of routers A , B , C , D and none of A,B,C,D know where they are in the network,they dont know how many neighbours they have or what is the delay between themselves and ...
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The influence of fiber length stability in coherent fiber communication

The length of optical fiber tend to change along with the environment. I wonder how do the coherent optical fiber communication (like QAM, QPSK, etc.) successfully recover the phase of the signal, ...
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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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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 ...
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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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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 ...
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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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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 ...
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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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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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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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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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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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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 ...
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1 vote
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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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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. ...
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3 answers
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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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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 ...
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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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How can I handle Overrun and Framing errors in UART transmissions on PIC16 devices?

I am transmitting and receiving data over UART between two PIC16 devices using interrupts, but at random times, one of them seems to block its receiver and it stays stuck in that position permanently. ...
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Can I reconstruct the channel impulse response from OFDM least square channel estimation?

I'm working on a successive interference cancellation (SIC) project for an OFDM system. I used pilots and least square channel estimation to estimate the channel frequency response (CFR.) It works ...
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1 vote
1 answer
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Proof of Shannon capacity theorem

I was looking for a formal proof of the Shannon capacity theorem, which states the condition which is the maximum data rate possible between two wireless channels. I could not find the proof. Does it ...
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Algorithm for compressing a stream of 12-bit ADC data in a Cortex M0 microcontroller

In my application, a Cortex M0 microcontroller currently samples an ADC signal at 10 kHz and sends the result via a USB serial cable to a computer. I want to now increase the sampling rate to over 100 ...
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Getting 45.6 Ω when it should be 60 or 120 Ω on CAN bus

We have a 2011 Chrysler 6.1L Hemi SRT. We can not get any diagnostic reading at the DLC or OBDII port. We have checked all the wiring, fuses etc. Our readings at the DTC connector are as follows: CAN ...
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Are there any noise cancellation algorithm used in wireless communication? if so in which layer?

I understand that there are 7 layers in the OSI model. I would like to know is there any noise cancellation algorithm used in wireless communication? If so in which layer is it used? I am looking for ...
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30 votes
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How can the GPS position update rate be 10 Hz?

Based on stuff on the web (Wikipedia and others) the GPS navigation message bit rate is 50 bit/s. That includes all data needed for user position calculation (time, ephemeris, almanac, etc.) It seems ...
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Calculate the minimum data rate required for transmission of EEG signals (0.4-64.4Hz)

I'm a little bit confused here. I assumed that the transmission is going to be PCM, so I calculated this way: I assumed number of bits (n) and sampling frequency (64.4 * 2) then I said that the ...
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9 votes
8 answers
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How can the same radio signal be received by 100s of receivers without any loss in it?

In power supply, each house connected to the grid consumes a certain amount of power which leaves less power to be consumed for the rest of the houses. Similar to that, when a radio station broadcasts ...
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What is the difference between Antenna gain and Channel gain? [closed]

I have a fairly simple question that I've written in the title but just writing this body to meet stack's 'quality standards' What is the difference between Antenna gain and Channel gain?
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USB Device Intermittent Disconnects

I have Xilinx Eval Board(SP605) with USB-UART bridge(SI CP210x). The board is connected to Win10 Computer USB port. The USB communication is failing intermittently when running tests. Observation so ...
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1 vote
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Isolated UART communication with optocouplers

I want to create a universal PCB for projects requiring galvanic isolation. I'm not in need of fast baud rates, 9600 should suffice. My most common use will be with Arduino 5V/3V3. I want to ask if ...
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3 votes
3 answers
62 views

Power Consumption for Open Drain Communication

When using an open drain communication scheme, like I2C, it seems that the majority of power consumption comes from the sinking of current through the pull up resistor when a logic 0 is transmitted. ...
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1 vote
2 answers
151 views

Advantages of I and Q receiver over "real" signals receivers

I wanted to know better which are the main advantages of using an I and Q receiver like that: rather than a simple demodulator whose output is a real signal like that: Here some advangages are ...
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Spi in interrupt mode for transmission and reception in PIC microcontroller

I am using spi in pic16f877a, for m95320 eeprom. Using interrupt for communication, Everything is working fine. However I have to tweak something which is confusing me, of using interrupt. ...
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1 vote
1 answer
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How does send and receive work in Ethernet over power and what standard describes this?

From what I understand in 100/1000BASE-TX Ethernet, two pairs are adopted; one for transmitting and the other for receiving. What I'm wondering is how Ethernet over power works given that it's ...
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1 vote
2 answers
253 views

RS485 ESP32 half-duplex communication

I have a question, so I have two identical devices that I would like to communicate via RX / TX (RS485). Both devices are exactly the same component, but as far as I know this is half-duplex mode, ...
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1 answer
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USB 2.0 Externally Powered by 5V Supply

I was wondering if the following is possible: I was hoping to be able to do the above with my USB 2.0 10m active extension cable as I cannot find a Y version of the same cable, to simply cut the male ...
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Can MAX485 be connected to SN75176 for RS485 communication?

In one side I have an SN75176 and the other side is MAX485. Can both be connected for RS485 communication?
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What trouble will I get into if I use a headphone jack for serial communication between two arduinos?

I have a project that requires two arduinos to exchange some information when connected together via wire. When the connection is made, Arduino A should start sending a message. When Arduino B has ...
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3 answers
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Bandwidth of signal

What exactly do we mean the signal bandwidth is the range of frequencies the signal is made of?Is this referring to the Fourier transform of the signal in the frequency domain?
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10 votes
4 answers
2k views

What is the purpose of a carrier signal in communication technology?

What is the carrier signal for when we actually do not care about this but only about the other signal (the useful signal?) Why isn't only the useful signal used instead of mixing it with the carrier?...
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1 vote
1 answer
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Frequency Modulation - Why don't we modulate the carrier by multiplying message signal m(t) directly with f_car?

I am master student of computer science and I have got a problem/question from the domain of communication engineering. So: I'm listening to a lecture that's about Layer 1 stuff, and recently we ...
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2 votes
2 answers
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How to make a multupoint RS422 connection for serial communication?

I need an RS422 multipoint connection. When I tried connecting it as shown in the image the communication didn't work, but when I connected all the devices' pins T+, R+, T-, and R- i.e T+ of one ...
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1 vote
2 answers
111 views

Adding two termination resistors on the same node?

Can someone please explain to me why this is the wrong way to set up a CAN bus? When I measure the resistance between CANH and CANL I get 60Ω, so why must I put the termination resistor on node 2 when ...
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JTAG Communication Failure in ARRIA 10 FPGA

Has anyone bricked an ARRIA 10 FGPA (or any FPGA) and successfully unbricked it? I have an ARRIA 10 that uses an EPCQ-L256 external memory to configure the FPGA. When I uploaded some code, I think I ...
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Simple FM Radio Tuning Mechanisms

I am prototyping a simple FM radio; I have this so far but I am looking for a way to tune to specific stations and block out AM frequencies. Any time I try to add filtering between the FM Source and ...
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1 vote
1 answer
132 views

How to send out signal on two wires

I have two wires for a DALI communication bus. The voltage between them is 16V and I want to send out commands on the two wires from the bus. My guess would be to have a simple transistor between the ...
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0 votes
4 answers
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Rs485 A & B Labels being used inconsistently

I would like to know if there is an official standard with regards to rs-485 terminals being labelled A & B. I have always believed: A=> + (positive) and B=> - (negative) however, I have ...
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