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 ...
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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 ...
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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 (...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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% ...
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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 ...
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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 ...
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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....
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