Skip to main content

Top 5 Posts for 2021

It's that time of the year when we look back to see which posts did well and which didn't. Here are the top 5 posts from this year, most popular first.

1. CSI-RS vs SRS Beamforming, March 2021

2. Why Starlink is Already a Gamechanger, March 2021

3. Ericsson Explains Internet of Drones and 3GPP UAV Roadmap, August 2021

4. LTE vs 5G Fixed Wireless Access (FWA), April 2021

5. Cellular Connectivity Technology Landscape and Standards for Industrial IoT, September 2021

Here are three bonus posts that made it to the top 5 but they were posted before 2021:

A. High-level Architecture Introduction of Mobile Cellular Networks from 2G to 5G, August 2019

B. IEEE 802.11be Extremely High Throughput (EHT), a.k.a. Wi-Fi 7, November 2020

C. 5G Connectivity will Enable New Use Cases, May 2020

Related Posts:


Popular posts from this blog

CSI-RS vs SRS Beamforming

In an issue of Signals Flash by Signals Research Group (SRG), they talked about 2 different types of MIMO. Quoting from their journal, "CSI-RS versus SRS. Those operators that have tested or made token use of MU-MIMO leverage a flavor of MU-MIMO that is based on CSI-RS. The MU-MIMO network we tested was based on SRS, which makes it far more likely to observe sixteen spatial layers (versus eight)." I reached out to Emil Bj√∂rnson, Visiting Professor at KTH Royal Institute of Technology and Associate Professor at Link√∂ping University to see if he has explained this in any of his videos. Here is what he said: " I'm not talking about 3GPP terminology in any of my videos. But you can listen to the slides that starts around 12:40 in this video (embedded below) . If you are looking for CSI-RS vs SRS based MU-MIMO, then jump to around 12:40 in this video where you can see CSI-RS being referred to as "grid of beams" and SRS is similar to the other option, which is t

High-level Architecture Introduction of Mobile Cellular Networks from 2G to 5G

Here is an old tutorial explaining high level mobile network architecture, starting from GSM and then looking at GPRS, UMTS, LTE & 5G. Slides and video below High-level architecture of Mobile Cellular Networks from 2G to 5G from 3G4G Related links : Free 2G, 3G, 4G & 5G Training Videos 5G (IMT-2020) Wireless 5G vs 4G: what is the difference?

Laser Inter-Satellite Links (LISLs) in a Starlink Constellation

When we first talked about Starlink back in 2019 , we saw in the video that the concept involved laser communication to communicate between the satellites. While the initially launched satellites did not have the laser communication mechanism built in, it looks like they are being added to the newer ones.  A report from Fast Company in late 2021 said: One of the next big upgrades in telecom will involve satellites firing lasers at each other—to beam data, not blow stuff up. The upside of replacing traditional radio-frequency communication with lasers, that encode data as pulses of light, can be much like that of deploying fiber-optic cable for terrestrial broadband: much faster speeds and much lower latency. “Laser links in orbit can reduce long-distance latency by as much as 50%, due to higher speed of light in vacuum & shorter path than undersea fiber,” SpaceX founder Elon Musk tweeted in July about the upgrade now beginning for that firm’s Starlink satellite constellation. The