Performance Analysis of Decode and Forward Relaying with Keyhole in Nakagami-m Fading Channels
pawan khadka · KTH Publication Database DiVA (KTH Royal Institute of Technology) · 2012
Fading has always been a major obstacle in the effective transmission of signals from the transmit antenna to the receive antenna. The innovation of multiple-input multiple-output (MIMO) system has led to the regression of the adverse effect of these fading entities and thus provided a higher data rate communication while maintaining the quality of service (QoS). A MIMO system is efficient and reliable but has hardware complexities. Thus, the concept of cooperative technology was put forth with a view to deal with the drawbacks of MIMO system. Cooperative communication comprises of relay terminals placed in between source and destination which then act as a virtual MIMO system and thus maintaining the QoS and reliability. In this thesis, we consider a downlink MIMO decode and forward (DF) relay system with ns antennas at the source S, nr antennas at the relay R and nd antennas at the destination D. An orthogonal space time block code (OSTBC) transmission is applied to the source-destination, source-relay and relay-destination links in order to exploit diversity gain. The transmitted signal from the source supposedly passes through a keyhole Nakagami-m fading channel. We then obtain the moment generating function (MGF) of the overall system which leads to the derivation of an analytical expressions for symbol error rate (SER) applying M-ary phase shift keying (MPSK) in a MIMO DF relay system. We then, as per our objective, obtain and analyse the outputs of the MIMO relay systems for different antenna pairs and fading severity parameters on the keyhole affected Nakagami-m channel. We analyse the effects of the MIMO DF relay system over the keyhole Nakagami-m channel.