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Category IETF

Posts: 10
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LTE: Hierarchical to Flat IP Mobile Architectures (Part 2)

John Sobanski | Sat 25 June 2022

This month's blog post continues to discuss the evolution from hierarchical to Flat Internet Ptotocol (IP) Architectures for mobile networks. Be sure to read Part One if you have not already. This post briefly discusses the components of mobile...

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LTE: Hierarchical to Flat IP Mobile Architectures (Part 1)

John Sobanski | Sat 28 May 2022

I wrote this white paper a while back. This paper discusses the evolution from hierarchical to Flat IP Architectures for mobile networks. This information may be of interest to mobile network architects, especially in light of the emergence of...

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Forward Error Correction Visualized - Convolutional Codes

John Sobanski | Sat 26 February 2022

Over the air communications, such as text messages, satellite radio, walkie talkies and WiFi need to deal with the unpredictable effects of noise in the channel. Coding theory attempts to make noisy channels more reliable by bringing the noise...

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Forward Error Correction (FEC) Visualized - Block Codes

John Sobanski | Sat 29 January 2022

Engineers face the reality of imperfect and noisy channels when designing digital communication systems (DCS). The engineers must account for signal degradation to ensure that a receiver receives the message that the transmitter intended....

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Adaptive Forward Error Correction (AFEC) for the Ka band

John Sobanski | Sat 31 July 2021

Satellite system engineers consider the narrow beams (which lend themselves to frequency reuse) and high data rates of Ka band channels attractive for communication systems [Khan 2]. As a result, the satellite community witnessed a great increase...

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Signals, Random Variables, Digital Messages and Equalization

John Sobanski | Sat 29 September 2018

This blog post summarizes the first three chapters of Bernard Sklar's Digital Communication - Fundamentals and Applications textbook. Signals A Digital Communication System (DCS) transmitter (XMT) sends a waveform selected from a finite set of...

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Internet Scale Reliable Multicast (Part 4): The Gotchas

John Sobanski | Sat 19 August 2017

Freshlex LLC (should) architect the reliable multicast infrastructure for the putative John Carmack biopic, which will hit the Internet in December of 2018. The first blog post discusses two of the enabling technologies, FCAST and ALC. The second...

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Internet Scale Reliable Multicast (Part 3): Architecture

John Sobanski | Sat 14 January 2017

Freshlex LLC (should) architect the reliable multicast infrastructure for the putative John Carmack biopic, which will hit the Internet in December of 2018. The first blog post discusses two of the enabling technologies, FCAST and ALC. The second...

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Internet Scale Reliable Multicast (Part 2): LCT, WEBRC, FEC

John Sobanski | Sat 17 December 2016

Freshlex LLC (should) architect the reliable multicast infrastructure for the putative John Carmack biopic, which will hit the internet in December of 2018. The first blog post discusses two of the enabling technologies, FCAST and ALC. This blog...

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Internet Scale Reliable Multicast (Part 1): FCAST and ALC

John Sobanski | Sat 15 October 2016

Reliable multicast?!? How on earth can you guarantee transport using a unidirectional, asynchronous delivery method? Could you scale your solution to support ten million downstream users, each with a different capacity, varying from dial up to...

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