How to mitigate pilot contamination in massive MIMO by using the pilot reuse factor in order to improve spectral efficiency?

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Emil Björnson

This is explained in detail in Chapter 6 of the book "Fundamentals of Massive MIMO".

You can also check out the paper "Massive MIMO for Maximal Spectral Efficiency: How Many Users and Pilots Should Be Allocated?", http://arxiv.org/pdf/1412.7102

My book is now available for free: https://massivemimobook.com/