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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 Frequency). Distances can be as low as centimeters (e.g. RFID); there's no upper limit.

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Cannot decode IR signals using IRRemote Library

I'm using RC5 encoding for my project. I'm sending signals using RC5 Protocol. The transmitter is sending the signals correctly. But on the receiver node, when I decode the signals, Library is unable ...
Tauseef_Ahmed's user avatar
1 vote
1 answer
30 views

expected dwell time

I am trying to calculate the dwell time of a mobile user in a UAV coverage. So if \$x_\text{start}\$ and \$y_\text{start}\$ are the initial positions and \$x_\text{end}\$ and \$y_\text{end}\$ are the ...
user7341333's user avatar
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1 answer
37 views

P2P communication: maximum range for low power & low bandwidth

I've started a little side project with the goal of tracking my cat's location in real time. To transmit the GPS-data, it seems like I have two options: I can either use cellular communication or (...
bns's user avatar
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0 answers
36 views

Modifying modulation parameters in RC5 [closed]

I am a computer science student working on a research project that uses IRRemote library for IR communication. I'm using RC5 modulation and the system is working. However, for the next part of this ...
Tauseef_Ahmed's user avatar
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0 answers
37 views

Is there an equivalent to the 902-928 MHz ISM band for Europe?

Is there a band for Europe that is similar to the North/South American ISM band (902 MHz - 928 MHz) where custom short-range wireless signals (~100m or less, under 10 dBm) can be used without any ...
plu's user avatar
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1 answer
49 views

DAC and ADC Clipping, Headroom before Clipping, Peak and RMS confusion

If I wanted to calculate the back off or headroom of a signal before clipping in an ADC, should this be the difference between the ADC peak full scale and the RMS of my signal or should it be the ...
cesar's user avatar
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0 answers
30 views

Can you do a TDoA/PDoA localization between a Qorvo DWM1000 and an iPhone?

I would like to build a system for a school project where I need to get the distance and direction from an object to my phone inside a room, so UWB would be best suited for this case. It’s my first ...
Benjamin Soulas's user avatar
0 votes
1 answer
53 views

How to specify the p1 dB of an amplifier?

I am measuring the gain of a class AB power amplifier vs its output power and I see that in the linear region its gain is a steady 14 dB When it approaches the nonlinear region there is an increase in ...
cesar's user avatar
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0 votes
3 answers
122 views

Why is there a greater lag in Bluetooth headphones compared to wired?

The Usual Answers and Responses: Encoding, Compression, and Buffering The typical answer to this on the internet is because Bluetooth headphones require the conversion of one form of data information ...
Curious Layman's user avatar
1 vote
1 answer
217 views

Digital Beamforming performance issues - ADC and DAC clipping

Digital Beamforming when compared with analog beamforming provides many benefits in terms of performance and flexibility. It is however more complex and each antenna will have its own frontend and own ...
cesar's user avatar
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1 answer
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Rx digital beamforming

I am using Rx digital beamforming with independent ADCs . These ADCs introduce quantization noise which I am trying to calculate and model. I am not sure though if that quantization noise adds in ...
cesar's user avatar
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1 answer
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How do half-wave RF rectifiers manage efficiencies above 50%?-A theory

First off, this exact question was directly asked here EDAboard and I think it was hinted at in atleast two other posts on this exchange programmingEnthusiast, frick, by Andy AKA, who mentioned a 100% ...
Ne612we's user avatar
2 votes
2 answers
68 views

Switching from time domain to frequency domain and vice versa in signal processing using FFT

I have a problem dealing with a real signal in time domain or in frequency domain when I need to do some processing on it in the dual or other domain via FFT or IFFT. I find myself dealing with a ...
cesar's user avatar
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0 votes
1 answer
70 views

Average energy efficiency is very high

I am computing the energy efficiency of a wireless system, given by the ratio of how many bits are received over how many energy is consumed. $$EE=\dfrac{bits}{joules}$$ For a given scenario, I have ...
zdm's user avatar
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What is the best way to understand if nRF24L01+ still works properly?

I continuously transmit some data from one nRF24L01+ (nRF) to another one. After a long transmission time, I often experience that the transmitter stops its transmission at a random time for no reason....
adba's user avatar
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1 answer
48 views

How many independent test transceiver modules are truly required for MIMO testing?

In most if not all of the app notes I have ever seen from the major test equipment vendors, such as R&S and Keysight, it is strongly implied if not explicitly stated that in order to do an NxN ...
user12345's user avatar
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0 answers
26 views

Can I simulate wireless charging on PLECS?

I want to check the voltage fluctuation according to the separation distance of the transmitting/receiving coil on PLECS. So I used the following block. I made it through this block as follows. With ...
kogyu's user avatar
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Understanding the nature and the impact of gain flatness on EVM of a transmit signal

I have a signal which has a quite a steep slope in frequency domain (or gain non-flatness), in fact 3 dB. This signal will go through an amplifier and it is going to be operated in the saturation ...
cesar's user avatar
  • 369
1 vote
1 answer
30 views

LNA operating in its roll off region, filtering action of a strong interferer

I have an LNA and a strong interferer hitting it. Knowing the in band input IP3 and input P1 dB of the LNA, that strong interferer would saturate the amplifier if it were in band. However the ...
cesar's user avatar
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1 vote
2 answers
130 views

How can it be possible that I hear people's voices from my computer speaker? [closed]

I searched on the web and found it can apparently be due to truck drivers communicating on citizen's band radio which is around 20 MHz. Apparently this communication may cause interference with the ...
allexj's user avatar
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1 vote
0 answers
74 views

BLE interference from DC motors

The problem: I am making a remote control car. The car is being run with a Raspberry Pi Pico W. The power source is a 11.1 V Li-po. The power to the Pico is being stepped down with a 5 V regulator. I ...
thrandale's user avatar
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0 answers
46 views

BLE Connection Issues with RN4870/RN4871 Bluetooth Module

For a project, I want to connect my Laptop to a dsPIC microcontroller via BLE through a Microchip RN4871 module to read some data from a board. I can discover the chip and connect to it, but the ...
Roysten R.'s user avatar
1 vote
1 answer
67 views

What exactly does the limiter do in FSK demodulators?

I wonder what exactly the limiter does in FSK demodulators. What are the advantages? Could it be just a saturation in ADC or fixed-pointing stages?
Ali's user avatar
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1 answer
118 views

How do I convert a differential RF signal to a single ended signal? [closed]

I'm using an RF transceiver that has a differential pair output. I want to route it to an SMA connector. How do I convert the differential signal to a single ended signal?
Gonzalo García's user avatar
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0 answers
41 views

Is my rough design of wireless powered leds with a capacitance touch sensor reasonable?

Disclaimer: I am not an engineer, but I have a background in physics, so theoretically I should know most of this stuff, but in reality, I might have made some very basic and dumb mistakes. The ...
Tue's user avatar
  • 101
1 vote
2 answers
132 views

Is BPSK better than QPSK in any way?

I wonder why there are still some modems using BPSK as their modulation. Is there any benefit over QPSK (power, bandwidth, synchronization techniques, etc.)? I have been searching and found these: ...
Ali's user avatar
  • 33
0 votes
1 answer
119 views

Making a USB connection over WIFI [closed]

I have been using wired Carplay/Android Auto in my car. I checked a few existing wireless auto solutions and realised the present solution has a complete system inside to handle the connection. This ...
Raj Rohit Yadav's user avatar
0 votes
0 answers
129 views

Help with exploring the possibiltiy of "long distance" wireless charging

I have a question regarding the possibility of wireless charging (via coils and pads.) Essentially, I am trying to develop a product that will require charging from a car's battery and will be placed ...
Matheus's user avatar
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0 answers
48 views

Why do we get increase in BER with increase in Eb/N0 of the signal?

I'm working on a problem of MSK modulation scheme. I have passed my modulated signal through SUI channel Models and AWGN. But As I want to do analysis on the performance of SUI channels I'm getting ...
Fatima Ismail's user avatar
2 votes
2 answers
267 views

How to compute the energy efficiency in bits/s/watt

The energy efficiency (EE) in wireless communications is usually calculated as the ratio of data rate to power consumption: how many data (in bits per second) are delivered per consumed power (in ...
zdm's user avatar
  • 125
0 votes
0 answers
267 views

Can I connect my own hardware to a universal 2.4GHz RF wireless receiver?

I built a USB keyboard for PC with a microcontroller, and it works great. The next challenge is to do it wirelessly. I have seen that sell universal 2.4GHz RF to USB wireless receivers, similar to ...
Fabián Romo's user avatar
0 votes
2 answers
154 views

Whats the point of the feedhorn on a dish antenna, why cant the dish just have a matching network attached to the dish directly?

Apologies if any thing i have said is incorrect. But, in the context of antennas, an unmatched feedpoint often leads to reflections, impacting both transmission and reception. It appears that if the ...
George kirby's user avatar
0 votes
1 answer
31 views

Wireless programming of MCU in liquid [closed]

Which methods can be used to program the device in a liquid reservoir (high voltage insulating oil) wirelessly quickly and safely? There will be a distance of 3-5cm between the programmer block and ...
blackmatter's user avatar
0 votes
0 answers
84 views

Designing a circuit for wireless interrogation of a temperature SAW sensor

I'm currently working on a SAW-based temperature sensor. The gist of how it works is this: when the external temperature changes, the resonance frequency of the SAW resonator shifts. To detect the ...
Adrian's user avatar
  • 113
0 votes
0 answers
59 views

Send wireless signal from a wireless relay to turn a wireless lamp on

I have this wireless relay: The receiver is connected to a pump which is on the 1st floor of our house and can be controlled from the 3rd floor of our house. We have a neighbor (my sister) who can ...
user1764381's user avatar
2 votes
1 answer
69 views

Non-contact powering of LED indicator from a high voltage cable

We manufacture fireproof power plugs for high-voltage transformers used in mines. The way it works is we take the incoming single-phase cable and epoxy it into the plug and attach it to the ...
Mark Coetzee's user avatar
0 votes
1 answer
69 views

What is optical wireless communication? [closed]

What is the term optical wireless communication? According to my point of view, in optical communication there msut be a medium so the refractive index should be capable of keeping the wave inside the ...
Madara Thalpavila's user avatar
0 votes
0 answers
101 views

Adalm Pluto SDR - Second RX channel signal issues

I have a Pluto SDR rev c, on which I just enable the second TX and RX channel. I am sending a simple sinusoidal signal at a specific frequency (fc), but different phase and amplitude, using the two TX ...
Roby's user avatar
  • 1
0 votes
0 answers
24 views

Inductor based or switched capacitor DC-DC converter for given load parameters for mouse's headstage

For my master's thesis project, which focuses on designing a control loop for a DC-DC converter in the receiver of a resonant inductive coupling system to handle significant and unpredictable ...
Kwok's user avatar
  • 113
0 votes
2 answers
63 views

Small Wireless RGB LED Controller

We want to make a wearable accessory with at least one color-changing rgb led that you can set the color of by connecting to it wirelessly from a phone or computer. As this would be something to wear, ...
Pengu's user avatar
  • 1
0 votes
0 answers
77 views

NRF24L01+ questions

Hello I have bought 2 NRF24L01+ (for instance: https://www.addicore.com/products/nrf24l01-pa-lna-with-antenna-2-4ghz-wireless-transceiver) in order to make a link between 2 Arduino. I am searching ...
5Volts's user avatar
  • 175
3 votes
0 answers
135 views

Resonant Coupling for Optimal Power Transfer

I am trying to read the following paper: B. L. Cannon, J. F. Hoburg, D. D. Stancil and S. C. Goldstein, "Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple ...
ELec's user avatar
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0 votes
0 answers
61 views

How to shield a wireless microphone receiver from hdmi cables running under it?

We have some wireless microphones set up with the receivers in a confined space. After adding some HDMI cables (for streaming purposes) we now have an interference problem. While the transmitter is ...
Louis Somers's user avatar
0 votes
2 answers
67 views

What's wrong with the tx circuit?

Whenever I connect the power source, the transformer heats up, measures 0v AC and rectifier doesn't measure any voltage in DC. I feel there are components I need to add to the tx circuit. I'm trying ...
Afolayan mosopefoluwa's user avatar
1 vote
0 answers
83 views

What is the maximum relative speed at which wireless protocols can operate? (Doppler shift)

Let's take Wi-Fi and UWB. What determines in these standards their robustness to Doppler shift? The most obvious is the range of carrier frequency tolerance. But in both standards this range is ...
Dj Obsidian's user avatar
0 votes
0 answers
178 views

Untraceable datasheets of DC-DC buck converter (5 pin SOT23-5 IC) used in TP-LINK WiFi Router TL-WR720N V2

I am trying to search the datasheets of DC-DC buck converters used in the TP-LINK WiFi Router TL-WR720N V2. LD5AX and TR5XF A couple of years ago, an above mentioned router, belonging to one of my ...
Zahid's user avatar
  • 1
1 vote
2 answers
310 views

Need advice on achieving 1 km non-line-of-sight wireless communication without internet

I'm currently working on a project that involves establishing a reliable non-line-of-sight wireless communication link with a range of 1 kilometer or more. The project does not have internet access, ...
Lakshmi Vara Prasad Guduru's user avatar
2 votes
0 answers
37 views

What is the ideal wireless protocol that is best suited for wireless nerve impulse transmission? [closed]

I am working to develop a way to transmit nerve impulses wirelessly (or wired) past a break in the spinal cord. What would be the ideal protocol to effectively relay the signal? Even if the device was ...
Lunatic Radio's user avatar
0 votes
1 answer
57 views

How to enable short distance data transmission between two devices without BLE or infrared communication capabilities [closed]

I have two devices, neither of them have BLE (Bluetooth Low Energy) or infrared communication capabilities, but I would like to be able to transfer data between them over short distances. I know we ...
FredMorgan's user avatar
4 votes
1 answer
299 views

Sensing an object’s motion using a motion sensor inside the object?

I am considering making a mouse that you can essentially use in the air. It would be wirelessly connected to a computer/laptop, and you could move it through the air to track motion in the mouse. It’s ...
tt_16_123's user avatar

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