mmWave in smartphones: how Qualcomm made the impossible possible

mmWave in smartphones: how Qualcomm made the impossible possible 3r3122.  
3r3122.  
Qualcomm recently unveiled the world's first fully integrated 5G NR (mmWave) and sub-6 GHz RF modules for mobile devices. Until now, mmWave signals have not been used for mobile communication due to numerous technical difficulties. Therefore, many in the industry were convinced that this is simply impossible. How the difficulties were overcome and what effect the millimeter range will have on 5G - in our review below. 3r3122.  
3r311. 3r3119. 3r3122.  
3r3122.  
By 202? mobile data transmission traffic around the world will grow 30 times compared to 2014 and will be ...
+ 0 -

Losses in mismatched line

In the literature described approximate formulas for calculating additional heat losses in uncoordinated transmission lines (cables, waveguides) due to standing waves. The limitation of such formulas is that the own losses of the matched cable should be up to 2 dB. Today, high-loss cables are increasingly used for microwave frequencies above 1 GHz. Broadband antennas often have a CWS 1. To find a compromise between the length of the line (for example, the antenna's suspension height), its cost, to estimate losses in a deliberately mismatched line (for example, 75 Ohm cable in 50 Ohm systems)...
+ 0 -

Notes IoT provider. Case: we make a LoRa network for a fuel dispenser in Chelyabinsk

 3r33333. 3r3-31.
Hello, dear lovers of the Internet of Things. 3r33333. 3r33350.  3r33333.
I will continue the series of articles about our network LoRaWAN. Today I will tell you about the real case. This is a project for the largest shopping and entertainment complex in Chelyabinsk. I will share with you the figures and decisions on the project. 3r33333. 3r33350.  3r33333.
At the end of the article I will explain why we chose the LoRa transmission protocol, and not the zigbee. Perhaps someone will argue with that. The more interesting the discussion will be. 3r33333. 3r33350.  3r33333. 3r314...
+ 0 -

Expansion of the network capabilities of the programmable relay with WI-FI

How it all started


 
It all began with the development of algorithms for the programmable relay PR20? and often required the visualization or input of information from the computer, for this it is necessary to use the operator panel or SCADA system, but it is not always convenient, and whether it is necessary for simple systems. The solution was found quickly, and over time I tried to improve as much as possible and facilitate my work in this direction, which of these turned out to be read further.
 
It's about the WI-FI network card and its capabilities.
 
 
Expansion of the network capabilities of the programmable relay with WI-FI
 
 
Since th...[/h]
+ 0 -

How to bypass SMS identification when connecting to public Wi-Fi networks?

In 201? RF Government Decree No. 758 No. 80? which obliges owners of public WiFi networks to set up routers, identifies users via passport data, sms or state portal. services. Unwillingness of cafe owners to spend for Captive portal 's contributed to some providers in the distribution of their access points with paid SMS-authorization. I had a desire to check whether such a sms-authorization can be bypassed.
 
 
How to bypass SMS identification when connecting to public Wi-Fi networks?
 
here .
 
 
sudo -s # will work with super user rights
ifconfig # look at the name of the adapter that we want to use

 
We get the conclusion:
 
 
+ 0 -

On the digital economy, fires and the Internet

August 26 in the nearest suburbs, namely in the neighborhood Jubilee, Korolev, there was a fire in the apartment building (you can go in google to dial "Korolev fire at Leninskaya 4"): showed on all central and non-central television channels. No one expected that the roof and the upper flats would burn over the entire length of the house, but it happened. It did not help to extinguish all day, not even a helicopter.
 
But I wanted to tell you about something else. There was a misfortune, people lost their apartments. My friend burned EVERYTHING. And yet I'm not talking about this. In the ...
+ 0 -

Overview of the reader PocketBook 627: middle class with backlight, Wi-Fi and cloud service

Overview of the reader PocketBook 627: middle class with backlight, Wi-Fi and cloud serviceHello!
 
 
Recently in the official blog PocketBook on "Habr" came review the youngest model of the line of the end of 2018 - PocketBook 616. Now the reader has come, which is in the table of ranks on the line above. It's about PocketBook 627 . This is a mid-range model with a set of options, which, in my opinion, will be enough for about 90% of users of readers. Yes, there is a PocketBook 63? which is even steeper, but it a) will appear on sale only towards the end of September and b) it is intended for especially violent perfectionists. Well, that is, there is in it everything that ...
+ 0 -

Messengers with the function of Walkie-Talkie (Push-To-Talk, walkie-talkie)

Messengers with the function of Walkie-Talkie (Push-To-Talk, walkie-talkie)
 
Immediately I would like to clarify that the functionality of Walkie-Talkie or Push-To-Talk is not the same as sending audio messages in regular messengers.
 
 
Moreover, none of the popular messengers - WhatsApp, Skype, Viber, Telegram, etc., does not have this capability.
 
 
The main advantage of PTT is the ability to listen to voice messages via hands-free in the real-time, without touching the smartphone and at the same time being in touch with a large number of users.
 
Voxer - one of the very first applications of the Internet radio, was founded in 2007 under ...
+ 0 -

Seamless Wi-Fi-roaming: theory in practice

We deal with the technologies of roaming (Handover, Band steering, IEEE ???k, r, v) and conduct a couple of visual experiments demonstrating their work in practice.
 
 
Seamless Wi-Fi-roaming: theory in practice  
switch , to which both access points participating in the experiment are connected. Frames from one access point fell into one network card of the traffic collection system, the frames from the second to the second one. In the received dumps, only voice traffic was selected. The delay in switching can be considered as the time interval elapsed from the moment of traffic loss through one network interface, and before it appears on ...
+ 0 -

All you wanted to know about testing Wi-Fi adapters, but were afraid to ask

All you wanted to know about testing Wi-Fi adapters, but were afraid to ask
 
 
One of these days our company will be 20 years old. The last 15 years of these 20 we are making programs for the analysis of Wi-Fi networks. Part of this work is the development of drivers for Wi-Fi adapters, and in this article I will describe how the development team is testing the products of its work, and how the testing process has evolved over these 15 years along with the evolution of standards and adapters. There will be many pictures (what is called "geek porn") and technical details.
 
Bplus Technology , which, among a large assortment of very interesting ...
+ 0 -