Seminar Date and Time: Thursday 28^th of May, at 1:00PM.

Venue: Sackville Street Building, B29

Seminar Title: Linear Precoding and Interference Exploitation in Wireless Communication Systems

Speaker: Dr Christos Masouros

Abstract:  In modern wireless communications systems the issue of computational and hardware complexity as well as power consumption of the mobile unites (MUs) within cellular networks is becoming more and more prominent. Towards this end, the current trend is to transfer the signal enhancement processing to the base stations (BSs) of the cellular networks. This is done by employing receiver multi-user detection at uplink transmission when the BS is receiving and transmitter based precoding at downlink when the BS is transmitting.

     The precoding techniques can be separated into two main categories, linear and non-linear. Further categorization of the precoding techniques can be based on the multi-access mode used, i.e. code division multi-access (CDMA), orthogonal frequency division multi-access (OFDMA), multiple input multiple output (MIMO) ect. For all types of precoding the aim is to provide bit error rate (BER) and capacity performance that is comparable to the performance of receiver based detection. The challenge for precoding is the requirement for limited transmission power from the BS which hinders the mitigation of interference.

     This seminar will present an overview of the linear precoding techniques for CDMA and MIMO systems, focusing on their principles and mathematical modelling. The processing of various techniques will be discussed with particular focus on the differences between them. The basic linear precoding techniques will also be compared in terms of performance and complexity and it will be shown that they can provide comparable performance to receiver based techniques while offering the advantage of simpler MU processing.

    The major degrading factor to the performance of wireless system is interference in its various forms. The seminar will further analyse and evaluate the different types of interference and introduce the separation between constructive and destructive interference providing illustrative examples and mathematical models. The talk will conclude by presenting new linear precoding techniques that take advantage of the constructive interference in order to provide improved performance without increasing the transmitted power.

Short Biography of the Speaker: Chris received his Diploma in Electrical & Computer Engineering from the University of Patras, Patras, Greece, in 2004 and MSc by research and PhD in Electrical & Electronic Engineering from the University of Manchester, Manchester, UK in 2006 and 2009, respectively. His research interests lie in the field of wireless communications and signal processing with particular focus on interference mitigation techniques for CDMA, multicarrier and MIMO communications.

This event is organised by the MACS Research Group.