MIMO MULTI-HOP RELAY SYSTEMS

Abstract

Multiple Input Multiple Output (MIMO) systems use multiple transmit and receiveantennas to achieve higher data rates by transmitting multiple independentdata systems. Transmission errors can be reduced by using Hybrid AutomaticRepeat request (HARQ) combining techniques with MIMO systems. In this thesis,the use of HARQ for MIMO multi-hop communication is studied. We proposetwo MIMO HARQ combining methods which are based on using pre-combiningonly and a joint pre and post combining techniques. In addition to conventionalsingle-hop transmission, HARQ schemes for MIMO multi-hop relay systems arealso investigated. A novel approach is proposed to deal with the parallel HARQprocesses in MIMO relay scenario. An information theoretic throughput analysisis performed to evaluate the performance of the relay system by employing varioustransmission techniques for relay-destination link. Evaluation is carried outon the delay involved while employing the relay systems as compared to singlehopsystems. Simulation results show that the proposed system can enhance theoverall throughput performance of MIMO single-hop and multi-hop relay systems.Considering the recent research interest in green radio and requirements ofreduced energy consumption by the wireless networks, we evaluated the energyefficiency of existing and proposed MIMO HARQ techniques for sensor and cellularnetworks. The results show that the proposed scheme is more energy efficientcompared to other schemes in single-hop as well as multi-hop scenarios.

Date of Award	31 Dec 2011
Original language	English
Awarding Institution	The University of Manchester
Supervisor	Daniel Ka Chun So (Supervisor)