6Security for Cell‐free Massive MIMO Networks
Tiep M. Hoang1, Hien Quoc Ngo2, Trung Q. Duong2 and Hoang D. Tuan3
1Queen's University Belfast, UK
2School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, UK
3School of Electrical and Data Engineering, University of Technology, Sydney, Australia
Cell‐free massive MIMO, where many access points (APs) distributed in a wide area coherently serve many users in the same time/frequency resource, is one of the most promising technologies for the next generation of wireless systems. While many aspects regarding resource allocations, pilot designs, and performance analysis of cell‐free massive MIMO have been intensively investigated, physical layer security in cell‐free massive MIMO has not been exploited. In this chapter, we first provide some basic concepts of cell‐free massive MIMO. Then the security aspect of cell‐free massive MIMO under a pilot spoofing attack is investigated. To deal with this attack, we present a simple counterattack scheme, which is based on the power allocation at the APs.
6.1 Introduction
Massive multi‐input multi‐output (MIMO) is one of the key technologies for next generation wireless networks. Massive MIMO systems can be classified into two types based on the geometric setting of antennas: (i) collocated massive MIMO systems and (ii) distributed massive MIMO systems. The first type can be described as the use of a large number of antennas in a small area, for example, ...
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