Diversity and outage performance in space–time block coded Ricean MIMO channels

The goal of this paper is to assess the impact of real-world propagation conditions on the maxi-mum achievable diversity performance of communication over Ricean MIMO (Multiple-Input Multiple-Output) channels. To this end, we examine a MIMO channel employing Orthogonal Space-Time Block Codes (OSTBCs) and study the diversity behavior of the resulting effective SISO (Single-Input Single-Output) channel. The performance criteria employed are symbol error rate, outage capacity, and wide-band spectral efficiency. For general propagation conditions, we establish key quantities which determine performance irrespective of the performance criterion used. Furthermore, we discuss the relation between the notion of diversity order related to the slope of the average error probability vs. signal-to-noise ratio (SNR) curve, and diversity order related to the slope of the outage probability vs. SNR curve. For Ricean fading MIMO channels we demonstrate the existence of an SNR-dependent critical rate, Rcrit, below which signaling with zero outage is possible, and hence the fading channel behaves like an AWGN channel. For SISO channels, Rcrit is always zero. In the MIMO case, Rcrit is a simple function of the angle between the vectorized Ricean component of the channel and the subspace spanned by the vectorized Rayleigh fading component

Introduction to space-time wireless communications / Arogyaswami Paulraj, Rohit Nabar, Dhananjay Gore.

Includes bibliographical references (p. 254-270) and index.Book fair 2012.xxx, 277 p.

An Overview of MIMO Communications: A Key to Gigabit Wireless

High data rate wireless communications, nearing 1 Gigabit/second (Gbps) transmission rates, is of interest in emerging Wireless Local Area Networks (WLANs) and home Audio/Visual (A/V) networks. Designing very high speed wireless links that offer good Quality-of-Service (QoS) and range capability in Non-Line-of-Sight (NLOS) environments constitutes a significant research and engineering challenge. Ignoring fading in NLOS environments, we can, in principle, meet the 1Gbps data rate requirement with a single-transmit single-receive antenna wireless system if the product of bandwidth (measured in Hz) and spectral efficiency (measured in bps/Hz) is equal to 10 9. As we shall outline in this paper, a variety of cost, technology and regulatory constraints make such a brute force solution unattractive if not impossible. The use of multiple antennas at transmitter and receiver, popularly known as multiple-input multiple-output (MIMO) wireless is an emerging cost-effective technology that offers substantial leverages in making 1Gbps wireless links a reality. This paper provides an overview of MIMO wireless technology covering channel models, performance limits, coding, and transceiver design