University of Oulu

High reliability downlink MU-MIMO with new encoded OSTBC approach and superposition modulated side information

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Author: Boulaioune, Nora1
Organizations: 1University of Oulu, Faculty of Information Technology and Electrical Engineering, Communications Engineering
Format: ebook
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
Pages: 55
Persistent link:
Language: English
Published: Oulu : N. Boulaioune, 2019
Publish Date: 2019-05-17
Thesis type: Master's thesis (tech)
Tutor: Rajatheva, Rajatheva
Reviewer: Rajatheva, Rajatheva
Pirinen, Pekka


The promise of Fifth Generation Mobile Network (5G) heralded 5G-era with apparently unlimited potential outcomes. It resulted in the emergence of new paradigms of thought, better approaches to lead business, new innovative solutions, services and products, and is expected to transform the world as we know it. With the advent of some of those new technologies and use cases which deviate from the traditional human-centric, delay tolerant applications, the need for Ultra-Reliable Low-Latency Communications (URLLC) in the 5G wireless network has become indispensable.

In this thesis we investigate how to improve the reliability of a downlink multiuser (MU) MIMO transmission scheme with the use of a new approach of orthogonal space time block codes (OSTBC) and network coding with superposition modulated system and side information. The main advantage here is that we show multiple users can be accommodated with the same resource. This is quite useful in a wireless system where resources are always restricted. This therefore is a combination of two techniques to further enhance reliability. Orthogonality is useful in terms of resolving different signals from multiple antennas in a reduced complexity configuration. Superposition modulation with side information is important as it facilitates the recovery of symbols while still keeping the energy normalized. Thus we carried out a detailed analysis with the new OSTBC approach. It is shown that the performance of a multiuser (MU) MIMO system can be improved significantly in terms of bit, block and frame error rates (BER, BLER and FER) as reliability measures. By accommodating a reasonable number of multiple users, high reliability is achieved at the expense of bringing down the rate. To compensate for the low rate, conventional OSTBC is considered as well, where, as a penalty to pay, multiple orthogonal resources are required.

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Copyright information: © Nora Boulaioune, 2019. This publication is copyrighted. You may download, display and print it for your own personal use. Commercial use is prohibited.