jxj

4 ms·

1.
by jxj 3y ago
To my understanding, the main difficulties are: 1. The investment needed for a real "free" Wi-Fi chip is much higher than most people's (FPGA, DIY, enthusiast and garage guys) imagination. I won't go through all the comp
2.
by jxj 3y ago
We do even further. If we use openwifi as a router in home, it can fuzz the CSI and destroy those sensing method: https://github.com/open-sdr/openwifi/blob/master/doc/app_not...
3.
by jxj 6y ago
"free software", "for any purpose", beautiful target. But maybe it can not be achieved in one step. People select a license for purpose. No matter what is the purpose, the developer is free to choose, the user is free to
4.
by jxj 6y ago
Ok. Actually I never (and don’t know who) call AGPL software a free software. Let’s just call it AGPL software! Problem solved. Just curious, if AGPL is so evil, who made it for what kind of purpose from the beginning? You give me an impres
5.
by jxj 6y ago
If you are saying AGPL's virus like behavior is much more severe than the GPL's virus like behavior, I am not professional on this aspect. Not sure. If I understand correctly, the open source action is only required when you &quot
6.
by jxj 6y ago
But in the MongoDB case (when it was still using AGPLv3), those companies who violated AGPLv3 did have a solution: pay a fee for a commercial license of MongoDB instead of AGPLv3 which is free. In this way, those companies don't need t
7.
by jxj 6y ago
So GPL doesn’t have this character? Like the GPLv2 taken by Linux kernel. I have an impression that AGPL only add “A” to GPL to adapt itself to the cloud era. Because a cloud/service deployment is not treated as redistribution in GPL,
8.
by jxj 6y ago
How so?
9.
by jxj 6y ago
2000USD? Not really. Following two options are less than 1000USD: 1. zed board + fmcomms4 = 883 USD https://www.digikey.com/product-detail/en/digilent-inc/410-2... https://www.digikey.com/prod
10.
by jxj 6y ago
A short answer: yes you can. A bit longer answer: Basically Linux gives packet to our driver, and then our driver gives the packet to our FPGA for further processing (queuing, modulation, CSMA, etc). So you can compose your packet in the
11.
by jxj 6y ago
Good and tough question. So far, we are not very successful to find enough funding to bring the design to the next mature level and tape out it. Working on it, but difficult. No one can decide to pay 200~300k euro in a minute with very unce
12.
by jxj 6y ago
Indeed, not only the viterbi but also many basic building blocks in the Xilinx and Analog Devices reference design which is the starting point of our openwifi project. Viterbi won't be an issue, we know how to write our own viterbi dec
13.
by jxj 6y ago
8bit I/Q definitely can be used for WiFi. I used HACKRF to send and capture Wifi packet without an issue (offline, use Matlab to process the captured I/Q samples). Low resolution I/Q (8bit) will impact the RX sensitivity and
14.
by jxj 6y ago
I like this sentence "nothing works until just about everything is working". Actually the first ping worked in the end of 2018 to the beginning of 2019. But like you also realize, it is complicated, and actually well beyond my ori
15.
by jxj 6y ago
Hello, This is the author Xianjun. When communicate with commercial device, tcp can achieve ~30M, UDP can achieve ~38M in 20MHz 11a/g non MIMO mode. We are still working hard to optimize the whole design, because we know it is not matu