Efficient antenna selection schemes for MIMO systems

Multiple input multiple output (MIMO) refers to the use of multiple antennas both at the transmit and receive ends of a wireless link. MIMO techniques can improve data throughput, link range, and reliability of a radio system. A major limiting factor in MIMO systems is the physical limitation of wireless devices and the cost of the multiple radio frequency (RF) chains. Antenna selection is considered as a low-cost low-complexity alternative. In this thesis, we focus on the antenna selection schemes to capture the advantages of MIMO systems such as diversity gain and spatial multiplexing gain with reduced RF hardware complexity. Furthermore, we apply the MIMO techniques to radar systems in order to improve the detection and resolution performances.;To begin with, we investigate two efficient join transmit and receive antenna selection algorithms to maximize the channel capacity. The proposed channel state information (CSI) based and channel correlation information (CCI) based schemes can achieve near optimal selection capacity performance with a much lower computational complexity compared to the optimal fully search scheme both in practical uncorrelated and correlated scenarios.;Based on the error rate selection criterion, we develop antenna selection algorithms and performance analysis for a spatial multiplexing (SM) system with linear receivers and space-time block coded (STBCed) systems with single-symbol maximum likelihood detection. Since practical systems usually need both multiplexing and diversity advantage, we combine adaptive transmit antenna selection with adaptive modulation for a SM system to maximize the throughput for a given bit error rate constraint and to lower the hardware complexity. In addition, we present performance analysis for STBCed systems with complex orthogonal designs (CODs) and generalized coordinate interleaved orthogonal designs (GCIODs). We then use these results to develop antenna selection algorithms. These are either based on minimizing error rate or maximizing the received SNR criterion.;At last, we extend the MIMO concept to radar systems and investigate the potential gains of a MIMO radar. Two system models are studied to explore the spatial diversity gain and resolution gain, respectively. With proper design of the transmitted signals and antenna configuration, MIMO radar systems result in higher performance in target detection, range resolution and angular resolution.