One of the best Massive MIMO books, a must read.
It is from 2017, and now they are preparing a Second Edition - and you can help! 
How to help?
If you have read the book and found anything that can be corrected, the author is willing to fix. Simply contact him through his Linkedin Emil Björnson.
You can also see Emil’s message here: Have you read my textbook “Massive MIMO networks” from 2017? I’m now in the process of correcting typos in the manuscript and prepare a new PDF. Have you found anything that can be corrected? Please… | Emil Björnson | 13 comments
How to Download?
If you still haven’t read this amazing Book, you can get a free PDF from massivemimobook.com.
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Emil Björnson Linköping University
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Jakob Hoydis Bell Labs, Nokia
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Luca Sanguinetti University of Pisa