Jeija

28 ms·

1.
by Jeija 2y ago
See https://github.com/espressif/esp-idf/issues/9843
2.
by Jeija 2y ago
Every WiFi chip needs to be able to synchronize to the received signal down to a few I/Q samples (the remaining synchronization error is accounted for by the cyclic prefix of OFDM). For example, with 40MHz of bandwidth, there is an I&#
3.
by Jeija 2y ago
Most wireless standards transmit some kind of pilot sequence next to the payload. A pilot is a sequence that is well-known to both TX and RX, and which allows the receiver to estimate the effect that the propagation has on the signal. The c
4.
by Jeija 2y ago
I'm currently experimenting with ESP32-C5 engineering samples provided by Espressif, so hopefully some future ESPARGOS revision will be 5GHz-capable :) But yeah, as far as I can tell, the chip can only extract CSI from WiFi (unless the
5.
by Jeija 2y ago
Oops, never tested the website on Safari / iOS. I will look into this at some point, opened a GitHub issue for myself so that I will remember: https://github.com/ESPARGOS/espargos.github.io/issues/1
6.
Channel Charting – Mapping the Radio Environment(dichasus.inue.uni-stuttgart.de)
4 points by Jeija 4y ago|0 comments
7.
by Jeija 6y ago
I've been pondering over the idea of offering the option to use physical device, like e.g. a Bluetooth bracelet, for contact tracing in addition to apps. For contact tracing to have an impact at all, we need a quite large percentage of
8.
by Jeija 7y ago
Citing from the paper: We refer the frequency shift satisfying the above requirements as artificial Doppler shift, implying that it has minimal impact on existing systems just like Doppler shifts caused by normal movements. So they'r
9.
Sigfox opens radio specifications(sigfox.com)
4 points by Jeija 8y ago|0 comments