Questions tagged [wireless]

Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (radio-frequent). Distances can be as low as centimeters (e.g. RFID), there's no upper limit.

Filter by
Sorted by
Tagged with
0
votes
0answers
19 views

Series and parallel resonance - influence of resistance [closed]

What effect does the resistance have on series and parallel resonance?
-3
votes
2answers
44 views

Receiver for Internet data [closed]

Can we use the same technology we use for radios to create a receiver which would catch Internet data? Can we build a receiver which would be connected directly to the satellites? And if those are not ...
0
votes
1answer
21 views

Motherboard panel header current

I'm looking to build a little pcb that boots my main PC over wifi with a ESP32. Because yes, no wake on lan or other fancy methods available. Looking through motherboard specs, I couldn't find a ...
0
votes
1answer
27 views

Dependence of wireless channel capacity on the system operating temperature

Does system temperature have any effect on the achievable channel capacity (channel capacity modelled using Shannon's theorem)? If the temperature is tripled or doubled, will it affect the channel ...
0
votes
2answers
87 views

nrf24l01 radio chip seems to return incorrect bytes - am I even talking to the device or I'm just getting pre-existing bytes in SPI_DR?

So I am running into this issue where I try to read something off the radio module but I keep getting the same value, which is 0x1C, and I have no idea why 0x1C in ...
2
votes
1answer
34 views

SyncE over wireless?

Doesn't look like "Synchronous Ethernet" exist over wireless like it does on wired. Is there any technical reason for it not existing? On wired, Synchronous Ethernet transfers a 125 MHz master clock ...
1
vote
0answers
22 views

Bluetooth and Wifi Interference

I have read that bluetooth devices had a built in short range with data rate of 1Mbps with a 2.4 Ghz Frequency, which means that there is possibility of interference between IEEE 802.11b WLANs and ...
0
votes
1answer
16 views

Some questions regarding the SPI configurations to interface with nrf24l01 radio transceiver

I am looking at the product spec of nordic nRF24L01 transceiver module and trying to figure out how I can use with the STM32's SPI. The MCU that I have is STM32F4 nucleo and it's got 4 SPI peripherals ...
0
votes
1answer
24 views

Equivalent baseband communication channel

I was reading on my lecture slides (I do not put them here since they are not in English) this statement about equivalent baseband channel models: In typical wireless applications, communication ...
0
votes
0answers
24 views

Which RF technology can be used between GNSS-based base and rover module?

I am looking for an RF technology/module/modem that is used to send RTK RTCM data from GNSS-based base module, to GNSS-based rover module (one way communication). I have few criteria to be considered ...
0
votes
0answers
19 views

Labeling requirements for equipment using off-the-shelf 900 MHz ISM radio

Can anyone tell me or point me to an authoritative reference as to what external labeling is required for an industrial product that uses an off-the-shelf 900 MHz ISM band radio? I understand that ...
0
votes
1answer
70 views

What is a good method for wireless transmission of images in a ~2km radius?

I am working on a project requiring regular image transmission over a 2km range. This needs to be done in an area with no cellular coverage. Energy efficiency is a factor, however it does not need ...
2
votes
0answers
22 views

How to correctly document wireless network choice for a project?

Disclaimer: I have limited wireless knowledge at the moment, I'm currently following the Certified Wireless Network Administrator study guide. I'm working on an RC car and have the following network ...
0
votes
1answer
23 views

Options for passive long range sensors

What I'd want to do is to use cheap disposable temperature sensors and to read the temperature data wirelessly. The sensors would be set in a medium such as reinforced concrete. Right now I'm using ...
0
votes
1answer
38 views

Suggestions for incorporating wireless capability to a simple sensor based project [closed]

So I have a simple application that involves reading the input over terminal via UART, and then responding accordingly, be it toggling an LED or outputting a sensor reading over I2C. As a step up, I ...
0
votes
1answer
34 views

Coherent and non-coherent detection

Let's say I am simulating something as simple as BFSK. It has two symbols, one entirely on the real plane, and one entirely on the complex plane for representing let's say zero. That is how the ...
0
votes
1answer
36 views

why base stations have 2 receiving antenna and only one transmitter?

I read that a base station is divided up into sectors to accommodate multiple service providers on a single tower. why each sector has two receiving antennas and only one transmitting antenna, As we ...
0
votes
2answers
48 views

Can we get higher internet speeds even with low BW message signals?

Consider a case where i’m listening to a recorded audio on internet.Basically the useful audio Frequency range lies b/w 40hz to 4khz, which has a BW of 4khz which is pretty low ,does that mean the ...
1
vote
3answers
53 views

Does data rate depends on Frequency not on BW?

If we have two RF signals of 900Mhz and 1800Mhz both of equal Bandwidth 20Mhz which one has higher data rate?
0
votes
2answers
37 views

What is meant by downstream bandwidth in lte?

In my phone, it says that the downstream bandwidth of LTE is 10Mhz. But if a carrier frequency of 900Mhz has a bandwidth of 20Mhz, i.e., frequency ranges from 900Mhz to 920Mhz, then I have almost half ...
0
votes
1answer
37 views

What is the relation between bandwidth and data rate?

If I have a 20Mhz bandwidth provided by my 2.4ghz router then will my internet speed will be 20M symbols per sec which is equal to 20×4= 80Mbps (considering 16 qam modulator with 4 bits per symbol) Is ...
0
votes
4answers
95 views

I want to reprograme my wirelss mouse so that it shall generate a nudge if it is on and inactive for 30s, is this possible? [closed]

My problem is that my work computer locks up if there is no activity for only a few minutes. One simple solution is to buy a wireless mouse (or even a wired mouse) that automatically sends a small ...
1
vote
1answer
35 views

How to plot BER Vs SNR of a received signal

I am using USRP to transmit and received MIMO frames similar to Wi-Fi standard that I created on my own. After receiving the signal, it is processed as described in the standard. While I plot the ...
1
vote
1answer
48 views

How to calculate the total signal strength and phase shift of multiple signals in a reciever

I have a simulation to make where I have an array of transmitters that transmit the same signal. At a random point, which I have to consider as a receiver I have to measure the phase shift of the ...
0
votes
0answers
14 views

Do all random access procedures and packet transmission in NB-IoT happen during one Nprach-periodicity?

I have two questions about random access procedures of NB-IoT In NB-IoT, Nprach-Periodicity is the amount of time between two consecutive random access transmission attempts. Random Access procedures ...
4
votes
2answers
543 views

What kind of oscillator circuit technology is used for 5G technology?

In particular, are 5G oscillators found in cellphones using some kind of SMT/fabricated Gunn diode or Impatt diode(on a chip)? The frequency bands(K band) are beyond the range of crystal oscillators. ...
1
vote
2answers
50 views

What is the difference between signal and symbol in wireless communications?

What are the definitions of signal and symbol in wireless communications, respectively? Often when I read books and papers I see things like "transmitted signal" and "transmitted symbol". Is there a ...
1
vote
1answer
49 views

Bluetooth and Wifi range onboard a boat

On my sailboat the range of wifi and Bluetooth appears to be very much shorter than in my home - I can't figure out why. ex1: At home I can stream video with Miracast from my basement to a room ...
1
vote
1answer
131 views

COVID-19 Human to Human 'Proximity' Logger

In the midst of the Corona Pandemic we are looking to develop a wearable sensor that when within approximately 2m of another (of the same type) of wearable sensor will log an event. The ideal would ...
0
votes
2answers
35 views

How to mitigate change in amplitude when transmitting signal from coil?

I connected 2 equal coils, one from a function generator and the other to an oscilloscope. The signal is transmitted OK, but the amplitude varies with frequency. How can I mitigate this change in ...
0
votes
1answer
66 views

How do I emit an arbitrary 2.4GHz radio wave

I'm looking to create a microcontroller that would allow me to drive my ceiling lamp that is controlled by 2.4GHz remote. The end goal is to integrate it with home automation tools, and forget about ...
0
votes
0answers
46 views

Transmitting sinewave from function generator wirelessly

I am trying to transmit wirelessly a sine wave signal of frequency from 50 to 200kHz. This signal is coming from a dedicated laboratory function generator. How can I transmit this signal and how can I ...
1
vote
0answers
35 views

Using RF 433 MHz Transmitter in Basement

Electronics beginner here. I am making a robot controlled by Arduino that drives around in a basement car park with obstacles ---> like this. I need to transmit and receive radio signals from it ...
0
votes
1answer
24 views

CADENCE wireless connection

I would like to know if you have a way to call without needing a line of communication at CADENCE? See the example in the PROTEUS software image, at the time I made the connections without needing ...
0
votes
0answers
15 views

MIMO degrees of freedom

Is the number of degrees of freedom in a spatial multiplexing MIMO system equivalent to the multiplexing gain? I.e. suppose we have a 4X4 (4 transmit and 4 receive antennas), the max multiplexing gain ...
3
votes
1answer
51 views

Why does probe request signal varies significantly in the same second?

I’m doing a crowdsensing experiment and I'm capturing a handful of probe requests packets in my Raspberry Pi 3B in my vehicle. To test them, I capture a handful of packets of my own phone. Whenever I ...
1
vote
2answers
68 views

What is the relation between beamforming design and user scheduling in massive MIMO systems?

This may seem like a basic question, but since I am a nonexpert trying to do some collaboration with people working in this field, I need to understand the two concepts. As I understand, beamforming ...
0
votes
0answers
29 views

Wireless Audio transmission (single TX -> single RX): Clock synchronisation/recovery

I am searching for a way to stream an audio signal to a single speaker in the living room. (I do NOT need brodcast to multiple receivers / multiroom) Audio quality is a major concern, since the ...
0
votes
0answers
41 views

BLE Connection Issue with Metal Case

I am working on an IoT project which using BLE (Bluetooth Low Energy). The Device Case is Metal Body. In our testing we have found that without the Metal Body the Device BLE is working absolutely fine ...
0
votes
0answers
104 views

What’s this slim rectangular box on my utility pole?

It’s the silver box on the utility pole here:
2
votes
0answers
42 views

Is it possible to transfer a bluetooth signal via something else?

Problem: For example, I have 2 devices communicating with each other via bluetooth. But there is a thick metal wall between these devices and this makes a difficulty between them. To fix it, can I ...
0
votes
3answers
55 views

Circuit for another circuit proximity detection [closed]

I just want to ask for some ideas, are there any known low-current circuits to detect direct proximity (max 1-3 cm) of another specially designed device? Must be difficult to "trick" by any other ...
2
votes
0answers
34 views

What is the “short-range outdoor model (ITU-1411) with a distance-dependent path-loss” mentioned in this paper?

I am reading the paper Graph Embedding Based Wireless Link Scheduling with Few Training Samples, and trying to reproduce some of its results. This paper aims to solve the wireless link scheduling ...
0
votes
0answers
34 views

Dimensioning of a simple Wireless energy transfer system

For a personal project, I want to design an electronic circuit to transfer (electrical) energy wirelessly to power a miniature pump. The constraints are as follows: distance between the coils (for ...
0
votes
0answers
52 views

Selective wireless power transfer

It is possibile to power on a single led (in a led panel) using wireless powering? I know the possibility to transfer power by wireless, but, is there a way to transfer power with high precision (1mm) ...
2
votes
0answers
53 views

Time Synchronization between stations over WIFI 802.11n

I'm working on a wireless (2.4Ghz WiFi 11n) project where multiple nodes (ESP32) send very small data to the AP, something like 40 bytes every minute or so. I need to maintain an accurate coordinated ...
0
votes
1answer
46 views

Which LTE band should I use?

Background I am designing a basic IIoT device. When the sensor detects the parameter of interest, it transmits a message using an LTE modem. The modem is capable of Cat-M1 and NB-IoT, and I want to ...
0
votes
0answers
45 views

Designing a wireless network of sensors

I'm designing a network of wireless sensors for an outdoor enviroment. It will consist of aprox. 30 sensors powered by battery (6 months autonomy), taking measurements with a low frequncy (max 10 ...
0
votes
1answer
32 views

Individual Digital Control Of LED Array

I am working to create a portable educational element display (about 2 meters wide) along the lines of this one at Griffith Observatory: http://www.griffithobservatory.org/exhibits/...
0
votes
0answers
42 views

nRF24L01+ radio module - IRQ problem

I have a problem with IRQ interrupts. After successful transmission, the nRF24L01+ sets the IRQ pin low (about 19 ms), but sometimes doesn't return to high: After every packet transmission (tx ...

1
2 3 4 5
20