160 citations · 178 across the 10 of their papers we have counts for
11 papers
Random Pilot and Data Access in Massive MIMO for Machine-type Communications
Elisabeth de Carvalho, Emil Björnson, Jesper H. Sørensen +2
A massive MIMO system, represented by a base station with hundreds of antennas, is capable of spatially multiplexing many devices and thus naturally suited to serve dense crowds of…
Delay Minimization in Real-time Communications with Joint Buffering and Coding
Jesper H. Sørensen, Petar Popovski, Jan Østergaard
We present a closed-form expression for the minimal delay that is achievable in a setting that combines a buffer and an erasure code, used to mitigate the packet delay variance. Th…
Random Access Protocols for Massive MIMO
Elisabeth de Carvalho, Emil Björnson, Jesper H. Sørensen +2
5G wireless networks are expected to support new services with stringent requirements on data rates, latency and reliability. One novel feature is the ability to serve a dense crow…
Coded Pilot Access: A Random Access Solution for Massive MIMO Systems
Jesper H. Sørensen, Elisabeth de Carvalho, Čedomir Stefanović +1
We present a novel access protocol for crowd scenarios in massive MIMO (Multiple-input multiple-output) systems. Crowd scenarios are characterized by a large number of users with i…
A Random Access Protocol for Pilot Allocation in Crowded Massive MIMO Systems
Emil Björnson, Elisabeth de Carvalho, Jesper H. Sørensen +2
The Massive MIMO (multiple-input multiple-output) technology has great potential to manage the rapid growth of wireless data traffic. Massive MIMO achieves tremendous spectral effi…
Massive MIMO for Crowd Scenarios: A Solution Based on Random Access
Jesper H. Sørensen, Elisabeth de Carvalho, Petar Popovski
This paper presents a new approach to intra-cell pilot contamination in crowded massive MIMO scenarios. The approach relies on two essential properties of a massive MIMO system, na…
Pilot Decontamination Through Pilot Sequence Hopping in Massive MIMO Systems
Jesper H. Sørensen, Elisabeth de Carvalho
This work concerns wireless cellular networks applying massive multiple-input multiple-output (MIMO) technology. In such a system, the base station in a given cell is equipped with…
Coded Splitting Tree Protocols
Jesper H. Sørensen, Cedomir Stefanović, Petar Popovski
This paper presents a novel approach to multiple access control called coded splitting tree protocol. The approach builds on the known tree splitting protocols, code structure and…
Analysis of LT Codes with Unequal Recovery Time
Jesper H. Sørensen, Petar Popovski, Jan Østergaard
In this paper we analyze a specific class of rateless codes, called LT codes with unequal recovery time. These codes provide the option of prioritizing different segments of the tr…
On the Role of Feedback in LT Codes
Jesper H. Sørensen, Petar Popovski, Jan Østergaard
This paper concerns application of feedback in LT codes. The considered type of feedback is acknowledgments, where information on which symbols have been decoded is given to the tr…
Design and Analysis of LT Codes with Decreasing Ripple Size
Jesper H. Sørensen, Petar Popovski, Jan Østergaard
In this paper we propose a new design of LT codes, which decreases the amount of necessary overhead in comparison to existing designs. The design focuses on a parameter of the LT d…