Journal ArticleDOI
Empirical analysis of a 2 x 2 MIMO channel in outdoor-indoor scenarios for BFWA applications
TLDR
A proposal is made for the use of a 2 times 2 MIMO system in outdoor-indoor scenarios for BFWA applications in metropolitan environments based on the experimentally verified hypothesis that the path loss due to building penetration can be practically compensated for by the diversity gain of 2 times 1 systems.Abstract:
The unquestionable advantages of multiple-input multiple-output (MIMO) systems are having a strong influence on the development of new wireless systems, both in wireless local-area networks (WLANs), and in those designed to offer broadband fixed wireless access (BFWA) services in wireless metropolitan-area networks (WMANs). The MIMO channel characterization in different environments and for different operating frequency bands is a crucial factor in the design of new systems and standards, and for adequate planning of existing systems. This article makes two main contributions. First, the experimental characterization of a 2 times 2 MIMO channel at a frequency of 2.4 GHz in a canonical outdoor-indoor scenario is presented. The channel characterization performed includes the analysis of the spatial correlation between the MIMO system subchannels and its impact on the channel capacity. Second, on the basis of the capacity results obtained, a proposal is made for the use of a 2 times 2 MIMO system in outdoor-indoor scenarios for BFWA applications in metropolitan environments. The proposal is based on the experimentally verified hypothesis that the path loss due to building penetration can be practically compensated for by the diversity gain of 2 times 2 systemsread more
Citations
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Journal ArticleDOI
A Dual-Linearly-Polarized MEMS-Reconfigurable Antenna for Narrowband MIMO Communication Systems
TL;DR: The design and characterization is described of a compact dual-linearly-polarized reconfigurable 2-port antenna, capable of reconfiguring/rotating its polarization base from vertical/horizontal (0°/90°), to slant ±45°, which enables polarization tracking in polarization-sensitive communication schemes.
Journal ArticleDOI
Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited Feedback
TL;DR: The measurements show that at small SNR values, a single antenna transmission often outperforms an Alamouti transmission, and the measured throughput is far from its achievable maximum; the loss is mainly caused by a too simple convolutional coding.
Journal ArticleDOI
Experimental Evaluation of MIMO Capacity and Correlation for Narrowband Body-Centric Wireless Channels
Imdad Khan,Peter Hall +1 more
TL;DR: The capacity and multiple-input multiple-output (MIMO) channel correlation analysis has been performed at 2.45 GHz frequency using planar inverted-F antennas (PIFA) for three on- body channels and the improvement offered by 2 × 2 MIMO over the conventional single-input single-output link for the on-body channels has been discussed.
Book
Multiantenna Systems for MIMO Communications
TL;DR: A comprehensive multiantenna formulation for multiple-input multiple-output systems is presented with a special emphasis on the connection of the electromagnetic and communication principles, paying particular attention to vectorial, directional, and timefrequency characteristics of the wireless communication equation for low- and high-scattering environments.
Journal ArticleDOI
Review of cutting-edge sensing technologies for urban underground construction
TL;DR: In this article, a review of the state-of-the-art sensing technologies for underground infrastructure performance is presented, where fiber optics, photogrammetric, and other advanced sensing technologies are introduced.
References
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A simple transmit diversity technique for wireless communications
TL;DR: This paper presents a simple two-branch transmit diversity scheme that provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas.
Journal ArticleDOI
Capacity of Multi‐antenna Gaussian Channels
TL;DR: In this paper, the authors investigate the use of multiple transmitting and/or receiving antennas for single user communications over the additive Gaussian channel with and without fading, and derive formulas for the capacities and error exponents of such channels, and describe computational procedures to evaluate such formulas.
Journal ArticleDOI
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
G. J. Foschini,M. J. Gans +1 more
TL;DR: In this article, the authors examined the performance of using multi-element array (MEA) technology to improve the bit-rate of digital wireless communications and showed that with high probability extraordinary capacity is available.
Journal ArticleDOI
Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas
TL;DR: This paper addresses digital communication in a Rayleigh fading environment when the channel characteristic is unknown at the transmitter but is known (tracked) at the receiver with the aim of leveraging the already highly developed 1-D codec technology.
Journal ArticleDOI
Fading correlation and its effect on the capacity of multielement antenna systems
TL;DR: It is shown that the fading correlation affects the MEA capacity by modifying the distributions of the gains of these subchannels, which depends on the physical parameters of MEA and the scatterer characteristics.