【資料名稱】：MIMO Channel Modelling

【資料作者】：Faisal Darbari, Robert W. Stewart and Ia

【資料日期】：2013

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

Introduction

Multiple antenna communications technologies offer significant advantages over single antenna systems. These advantages include extended range, improved reliability in fading environments and higher data throughputs. If multiple antennas are provided only at the
transmitting end of a link then the system is referred to as multiple input single output (MISO). If multiple antennas are provided only at the receiving end of a link then the system is referred to as single input multiple output (SIMO). If multiple antennas are provided at both ends of a link then the system is referred to as multiple input multiple output (MIMO).

Multiple antenna systems can be divided into two classes depending on the signal processing employed. These are: (i) smart antennas and (ii) spatial multiplexors.

Smart antennas provide increased signal-to-noise-and-interference ratio (SNIR) via diversity gain, array gain and/or interference suppression. Each transmit antenna radiates, to within a simple gain and delay difference, the same signal. Similarly, each receive antenna
contributes its signal to a gain and delay weighted sum. By setting transmit and receive gains and delays appropriately, improved SNIR is achieved which may be used to realise greater spectral efficiency (and, therefore, greater channel capacity), greater range and/or
decreased latency (due to a reduced requirement for channel coding).

Spatial multiplexors can provide increased channel capacity directly. Each transmit antenna radiates an independent signal sub-stream. With N transmit and N receive antennas, for example, an N-fold increase in data-rate is possible (in principle) over that achievable with a single input single output (SISO) antenna system (without any increase in total transmitted power).

In this chapter a theoretical framework for describing MIMO channels is presented followed by a brief outline of MIMO channel modelling principles [P. Almer et. al., 2007]. The rest of the chapter describes a selection of widely adopted MIMO channel models, their capabilities and limitations, in the context of specific standards.
InTech-Mimo_channel_modelling.pdf (2.15 MB)