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Axiros Tech Team | Russia Axiros Tech Team | Russia

WiFi: 2.4 GHz vs. 5 GHz

The recent studies carried out by a number of manufacturers of Wi-Fi devices have identified the support for 5 GHz networks as a competitive advantage. But why are such networks better than 2.4 GHz ones, in which many modern routers operate? Let's look into the matter.

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Tech Blog Axiros Tech Team | Russia Tech Blog Axiros Tech Team | Russia

5GHz Interference Issues

Unlike 2.4GHz bands, there are no overlapping channels in 5GHz range, like it was with 1, 2 and 3 channels. For example, within the context of U-NII-1 (see a list of WLAN channels below) only channels 36, 40, 44 and 48 can be selected; by default, each of them occupies 20MHz and nominally does not interfere with neighboring channels.

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Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH

Elliptic Curve Cryptography

There are two main different types of encryption - symmetric encryption, which uses one key to both encrypt and decrypt (e.g. AES), and asymmetric encryption, which uses two different keys (e.g. RSA).

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Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH

Using CSI from WiFi enabled IoT for Authentication

Often, building an authentication system requires some sort of deployment of IoT devices. At worst, every user needs a RFID device (similar to a key) to authenticate themselves. The idea proposed in this paper (Shi et al.) is to use present Wi-Fi infrastructure, which is very widely available (e.g. your local library has it, even the local candle shop likely has Wi-Fi).

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Tech Blog Wolfgang Drost | Axiros GmbH, Partner & Product Manager Tech Blog Wolfgang Drost | Axiros GmbH, Partner & Product Manager

Home Office with AX69 CLOUD and ON-PREMISES

It´s becoming clear that work from home is not just an exceptional situation in times of high Covid 19 incidence anymore. It's accepted now as a working model by many companies outside of the global pandemic context.

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Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH

Green Industrial Internet of Things

I recommend checking it out just because its design is stunning. Of course, the topic is also very interesting - CPEs and Internet of Things (IoT) devices often have very low energy requirements. On the one hand, such devices are inherently small and require less energy.

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Tech Blog Axiros Tech Team | Russia Tech Blog Axiros Tech Team | Russia

Cluster Optimization vs. Auto Channel

The Auto-channel means that a Wi-Fi router selects channels automatically based on the vendor’s algorithms. In this case, only a single device is considered and this can increase interference for the whole system.

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Tech Blog Philipp Mayr | Software Engineer, Axiros GmbH Tech Blog Philipp Mayr | Software Engineer, Axiros GmbH

Python3 Cache Decorator

Repeating computation efforts are very annoying. But even more annoying is it if they take a lot of time. Because that can get nasty quickly. But this is where caches come to save us from a lot of wasted time.
What is a cache?

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Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH

DOCSIS FBC Impairment Algorithms - Adjacency

There are many different Full Band Capture (FBC) impairments, one of the interesting impairments is adjacency because it is often so pronounced on the spectrum. The figures below shows a small adjacency: The channels suddenly jump slightly in their dB level.

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Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH

A Cursory Look At Machine Learning

Since a large set of posts on this blog deal with Machine Learning, I decided to write up a cursory look on the Machine Learning (ML) field. ML is the process of training a model using a training dataset and an optimiziation algorithm such that a certain task is fulfilled.

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Business Consulting Axiros Business Consulting Business Consulting Axiros Business Consulting

Part 1 - Engineers Make The Best Data Scientists!

Data analytics, machine learning and artificial intelligence are already the buzzwords of a revolution. Everything is AI now - every large company has a data analytics strategy, every start-up has ‘AI built-in’ if it seeks funding. The AI revolution has visibility and priority at Board and CEO level, so funding and resources for innovation is plentiful.

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Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH

NQI - One Of Many DOCSIS Health Indicators For Cable Modems In HFC Networks

In their paper "Performance Monitoring Challenges in HFC Networks", Milan et al. say that collecting big data and processing it is integral to calculating the health of the HFC network of operators. Their KPIs include some interesting ones such as Flap List and SNR - let's take a closer look at them.

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Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH Tech Blog Daniel Ratke | Software Engineer, Axiros GmbH

Clustering Downstream SNR Time Series For Better Visualization

The goal of this exercise is to find a smart way to group the SNR data over time of many channels belonging to a single cable modem dynamically to make visualization better: for example, have 24 lines appear as roughly 5-8 grouped lines that can be drilled down on.

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