Massive MIMO
Beyond the Cellular Paradigm: Cell-Free Architectures with Radio Stripes
Tue, 10 Mar 2020 16:37:00 +0000
I just finished giving an IEEE Future Networks Webinar on the topic of Cell-free Massive MIMO and radio stripes. The webinar is more technical than my previous popular-science video on the topic, but it can anyway be considered an overview on the basics and the implementation of the technology using radio stripes. If you missed … Continue reading Beyond the Cellular Paradigm: Cell-Free Architectures with Radio Stripes
Rician Fading – a Channel Model Often Misunderstood
Mon, 02 Mar 2020 13:53:12 +0000
Line-of-sight channels normally contain many propagation paths, whereof one is the direct path and the others are paths were the signals are scattered on different objects. The interaction between these paths lead to fading phenomena, which is often modeled statistically using Rician fading (sometimes written as Ricean fading). The main assumption is that the complex-valued … Continue reading Rician Fading – a Channel Model Often Misunderstood
Infinitely Large Arrays?
Thu, 20 Feb 2020 21:59:27 +0000
A defining factor for the early Massive MIMO literature is the study of communication systems where the number of base station antennas goes to infinity. Marzetta’s original paper considered this asymptotic regime from the outset. Many other papers derived rate expressions for a finite value, and then studied their behavior as . In these papers, … Continue reading Infinitely Large Arrays?
Two Roles of Deep Learning in Massive MIMO
Thu, 30 Jan 2020 10:04:57 +0000
The hype around machine learning, particularly deep learning, has spread over the world. It is not only affecting engineers but also philosophers and government agencies, which try to predict what implications machine learning will have on our society. When the initial excitement has subsided, I think machine learning will be an important tool that many … Continue reading Two Roles of Deep Learning in Massive MIMO
Intelligent Reflecting Surfaces: On Use Cases and Path Loss Model
Thu, 09 Jan 2020 20:21:50 +0000
Emerging intelligent reflecting surface (IRS) technology, also known under the names “reconfigurable intelligent surface” and “software-controlled metasurface”, is sometimes marketed as an enabling technology for 6G. How do they work, what are their use cases and how much will they improve wireless access performance at large? The physical principle of an IRS is that the … Continue reading Intelligent Reflecting Surfaces: On Use Cases and Path Loss Model
Revitalizing the Research on Wireless Communications in a New Decade
Thu, 02 Jan 2020 10:03:43 +0000
In the last decade, the research on wireless communications has been strongly focused on the development of 5G. Plenty of papers have started with sentences of the kind: “We consider X, which is a promising method that can greatly improve Y in 5G.” For example, X might be Massive MIMO and Y might be the spectral efficiency. We now … Continue reading Revitalizing the Research on Wireless Communications in a New Decade
Dynamic Cooperation Clusters
Thu, 28 Nov 2019 13:37:03 +0000
By deploying many distributed antennas instead of a few multi-antenna base stations, a more uniform communication performance can be achieved over a coverage area. The peak rates might go down but there is a much higher chance of getting a decent rate with 95% probability. This is the main motivation behind Cell-free Massive MIMO, which … Continue reading Dynamic Cooperation Clusters
Cell-free Massive MIMO and Radio Stripes
Sat, 16 Nov 2019 14:25:42 +0000
I have recorded a popular science video that explains how a cell-free network architecture can provide major performance improvements over 5G cellular networks, and why radio stripes is a promising way to implement it: If you want more technical details, I recommend our recent survey paper “Ubiquitous Cell-Free Massive MIMO Communications“. One of the authors, … Continue reading Cell-free Massive MIMO and Radio Stripes
Centralized Versus Distributed Processing in Cell-Free Massive MIMO
Mon, 04 Nov 2019 08:59:52 +0000
The new Cell-Free Massive MIMO concept has its roots in the classical Network MIMO concept, and has also been given many other names over the years (e.g., coordinated multipoint). When I started my research on the topic in 2009, the standard assumption was that a set of base stations were jointly transmitting to a set … Continue reading Centralized Versus Distributed Processing in Cell-Free Massive MIMO
Is the Pathloss Larger at mmWave Frequencies?
Tue, 29 Oct 2019 07:51:35 +0000
The range of mmWave communication signals is often said to be lower than for signals in the conventional sub-6 GHz bands. This is usually also the case but the reason for it might not be the one that you think. I will explain what I mean in this blog post. If one takes a look … Continue reading Is the Pathloss Larger at mmWave Frequencies?

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