Performance Analysis of MIMO Systems: Transmit Antenna Selection, Cooperative Communications and Spatial Modulation

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It is well known that multiple input multiple output (MIMO) systems improve transmission capacities and performance of wireless systems. But, with the increasing number of antennas, the required computation for detection at the receiver and the hardware at both the transmitter and the receiver ends becomes highly complex. To deal with this, MIMO systems that activate single antenna at a time were proposed namely transmit antenna selection (TAS) and spatial modulation (SM). TAS can achieve full diversity order. SM is a MIMO technique which can improve spectral efficiency up to a certain level. In this thesis, we consider TAS with maximal ratio combining at receiver (TAS/MRC), cooperative communications (CC) and SM aspects integrated with MIMO systems. Performance analysis of TAS/MRC MIMO systems is carried out over k −m and h −m fading channels. It may be noted that k −m and h −m fading distributions are better fit to practical fading conditions for line of sight and non line of sight conditions respectively. We derived closed form expressions for outage probability and infinite series expressions for SER and capacity of TAS/MRC MIMO systems. The expressions derived in this thesis for TAS/MRC systems are also applicable to TAS with selection combining at receiver (TAS/SC) systems. Simple expressions in the form of elementary functions are derived for approximate SER of SM MIMO systems over k −m and h −m fading channels. The expressions are also given for other fading channels as special cases of k −m and h −m fading channels. The application of TAS on two hop CC systems and SM MIMO systems have also been studied. Expressions for BER of TAS CC systems are derived using the analysis of TAS/MRC systems. Finally, closed form expression for outage probability is derived for SM MIMO systems with TAS over Rayleigh fading channels. All the expressions derived in the thesis are validated by Monte Carlo simulation results. It is also shown that the infinite series expressions are converging fast enough to achieve sufficient accuracy by truncating them up to practically computable number of terms.
Supervisor: Rakhesh Singh Kshetrimayum