Studentische Arbeiten

Titel: Implementation and Evaluation of Beam Tracking Algorithm for Hybrid-MIMO
  • Masterarbeit
Status: offen


One of the key aspects of the upcoming WiFi standards is going to be migration to 60GHz spectrum. To overcome new challenges like huge pathloss and spatial sparsity of these channels, the concept of Hybrid-MIMO will be a key aspect. It allows to form narrow spatial beams in order to transmit multiple data streams over the channel, while keeping the hardware costs low. This on the one hand allows to produce cheap consumer products but also places new challenges on digital and analog signal processing. One of these challenges is tracking of spatial beams over changes of the channel which might be causes ba user mobility.


To build up a reliable communication channel between a wireless LAN station (STA) and an access point (AP), both sides perform a beam training procedure initially. After this initial link setup has happened, multiple environmental influences like blockage by obstacles, mobility of the STA or changes in the environment might influence the channels quality or even disrupt the communication link which would force the participants to perform time consuming initial link setup again.

To avoid strong fluctuations of link quality, both STA and AP might track changes of the channel continuously and adapt their beams respectively. There have been proposed multiple methods to perform this tracking with the goal of minimizing tracking overhead while providing maximum stability of link quality [1].

THe focus of this thesis is the implementation of one of these methods which was originally proposed for Single-Input-Single-Output (SISO) systems and extend it to Hybrid Multiple-Input-Multiple-Output (MIMO), using an existing ray tracing based 60GHz channel model. In the course of the thesis, the topic might even be extended to cover additional aspects like Multi-User-MIMO or the usage of environmental information for beam tracking.


The scope of this work encompasses:

  • study of available literature on beam tracking algorithms for Hybrid Beamforming
  • getting familiar with the channel model framework
  • implementation of a mobility model (translatory and angular mobility)
  • systematic analysis of cluster movements for different mobility scenarios
  • implementation and verification of beam tracking algorithms

This work can be done in German or English language.

 [1] Beampattern-Based Tracking for Millimeter Wave Communication Systems, online arXiv:1612.05306 [cs.IT] .



  • MIMO Communications basics
  • Knowledge of signal processing
  • Good Matlab skills