Posts

SC-FDMA

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 Yesterday and today I have been reading (and watching videos) about SC-FDMA, or Single Carrier Frequency Division Multiple Access. It's quite fascinating.  One thing that I have been curious about as it pertains to Cellular, especially since I was deep in Wi-Fi for over ten years, was why do UEs (clients) have such a disparity in upload and download speeds? Wi-Fi was never perfectly symmetrical, but what's up with LTE showing about 100DL / 14UL on a perfect signal? That's where SC-FDMA steps in. The issue comes down the the technologies utilized (OFDMA on DM and SC-FDMA on UL) and the power consideratioons. Think of it like this - cellular base stations are large and have a lot of power and muscle at their disposal. Big high-gain antennas, low-loss RF cables and beefy radios in the hut below. Power is conditioned with batteries and UPSes. OFDMA is subject to large variations in power, and thus these aforementioned things are needed for a reliable signal to be transmitted a...
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Books I'm working through

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Good day all! I want to drop a short post on the books I am working through for this Journey (as of now). Note - none of these are affiliated links, I merely am posting a link to get you to the book should you want to buy it. 1) An Introduction to LTE -  Get it here 2) LTE Signaling -  Get it here 3) 5G New Radio in Bullets -  Get it here 4) 5G Core Networks -  Get it here If I end up acquiring new books in the future, I will be sure to list them in a new post.
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Welcome to Cellular Learnings!

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 Hey there, I'm Greg! A good friend of mine once told me that the best way to solidify knowledge of a thing is read a lot of things, and then write it down (whilst condensing it). I figure this would be a great place to write it down. :) I also like to teach, and so I hope that in doing this and walking with me on my journey, it will be helpful to you as well, my friends. I strive for accuracy and clarity, so if you see something inaccurate on here, please make a comment so that I'm not spreading falsehoods - it will be much appreciated.
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