PhD defence by Néstor Hernández


22.12.2016 kl. 13.00 - 16.00


“Network Coding for Cooperation in Wireless Networks”

Mobile users in wireless networks generate a large demand in high-quality data services that is expected to grow dramatically in the following years. This is critical in scenarios with a very high density of users where the radio resources are insufficient to deliver a good Quality of Experience (QoE). Considering network coding techniques that better use the available resources by exploiting short-range communication, e.g. WiFi or D2D in LTE-A, that allow cooperation between users is at the crux of delivering the necessary QoE. In this thesis we focused on the design, analysis and simulation of cooperation techniques based on Random Linear Network Coding (RLNC) for wireless networks. First, we investigated the operational regimes where cooperative cellular networks perform better than broadcast cellular networks in terms of data rate and energy costs, amount of cooperating devices and code constructions that indicate when and how to cooperate between the devices to offload the network. Second, we evaluated two transmission policies and a Medium Access Control (MAC) mechanism in decentralized Wireless Local Area Network (WLAN). To achieve this, we developed a software framework that allows to analyze these policies in a simple way using the C++11 Kodo library and the ns-3 simulator which is publicly available to the research community as a major contribution. Our coding schemes and techniques address key challenges in state of the art wireless networks to enhance the throughput and reduce the energy consumption at the cellular Base Station (BS) and the mobile devices while keeping the total overhead to the minimum.

Assessment Committee
Professor Frank Li, University of Agder, Norway
Associate Professor Ming Xiao, Royal Institute of Technology, KTH, Sweden
Assoc. Prof. Troels B. Sørensen, Aalborg University, Denmark (Chairman)

Assoc. Prof. Daniel Enrique Lucani Roetter, Aalborg University, Denmark
Professor Frank Fitzek, Aalborg University, Denmark

Assoc. Prof. Rasmus L. Olsen, Aalborg University, Denmark

After the defence there will be a reception in room A1-112 at Fredrik Bajers Vej 7A
Please feel welcome to join


Free of charge


Department of Electronic Systems, Wireless Communication Networks Section


Fredrik Bajers Vej 7 – room A4-108, Aalborg University


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