Channel Characteristics of MIMO-WLAN Communications at 60GHz for Various Corridors

[[abstract]]A comparison of 4 × 4 multiple-input multiple-output wireless local area network wireless communication characteristics for six different geometrical shapes is investigated. These six shapes include the straight shape corridor with rectangular cross section, the straight shape corridor with arched cross section, the curved shape corridor with rectangular cross section, the curved shape corridor with arched cross section, the L-shape corridor, and the T-shape corridor. The impulse responses of these corridors are computed by applying shooting and bouncing ray/image (SBR/Image) techniques along with inverse Fourier transform. By using the impulse response of these multipath channels, the mean excess delay, root mean square (RMS) delay spread for these six corridors can be obtained. Numerical results show that the capacity for the rectangular cross section corridors is smaller than those for the arched cross section corridors regardless of the shapes. And the RMS delay spreads for the T-and the L-shape corridors are greater than the other corridors.[[notice]]補正完畢[[incitationindex]]SCI[[incitationindex]]EI[[booktype]]紙本[[booktype]]電子

Capacity Analysis of MIMO-WLAN Systems with Single Co-Channel Interference

[[abstract]]In this paper, channel capacity of multiple-input multiple-output wireless local area network (MIMO-WLAN) systems with single co-channel interference (CCI) is calculated. A ray-tracing approach is used to calculate the channel frequency response, which is further used to calculate the corresponding channel capacity. The ability to combat CCI for the MIMO-WLAN simple uniform linear array (ULA) and polarization diversity array (PDA) are investigated. Also the effects caused by two antenna arrays for desired system and CCI are quantified. Numerical results show that MIMO-PDA is better than those of MIMO-ULA when interference is present.[[notice]]補正完畢[[incitationindex]]EI[[booktype]]紙本[[booktype]]電子

Analysis of DVB-H network coverage with the application of transmit diversity

This paper investigates the effects of the Cyclic Delay Diversity (CDD) transmit diversity scheme on DVB-H networks. Transmit diversity improves reception and Quality of Service (QoS) in areas of poor coverage such as sparsely populated or obscured locations. The technique not only provides robust reception in mobile environments thus improving QoS, but it also reduces network costs in terms of the transmit power, number of infrastructure elements, antenna height and the frequency reuse factor over indoor and outdoor environments. In this paper, the benefit and effectiveness of CDD transmit diversity is tackled through simulation results for comparison in several scenarios of coverage in DVB-H networks. The channel model used in the simulations is based on COST207 and a basic radio planning technique is used to illustrate the main principles developed in this paper. The work reported in this paper was supported by the European Commission IST project—PLUTO (Physical Layer DVB Transmission Optimization)

Indoor MIMO Channel Sounding at 3.5 GHz

International audienceThis paper presents a measurement campaign carried out at 3.5 GHz. The objective is to characterize the electromagnetic waves propagation in indoor environment. A double directional channel sounder was used to perform these measurements. The collected data were then processed with a high resolution algorithm to extract the multipath parameters. A comparison between measurement results and a ray tracing tool is done to interpret the propagation mechanisms in this environment. The aim of these measurement campaigns is to obtain realistic MIMO channel models

Modélisation de la propagation indoor an milieu domestique à 60 GHz

National audienc

Double Directional Channel Characterization on Board Ships

Abstract — Due to the metallic structure of decks, bulkheads and watertight (WT) doors, wireless communications are a serious challenge in the particular environment of ships. In order to deploy reliable shipboard wireless networks, wireless devices (access points, routers, sensor nodes, etc) must be located at strategic locations ensuring full radio coverage and network connectivity. Strategic locations can be determined from the identification of the main propagation directions of electromagnetic (EM) waves within a ship. This paper presents the results of a radio propagation measurement campaign performed on board a ship. A dual-band Multiple-Input Multiple-Output (MIMO) channel sounder and antenna arrays have been used. Measurement data have been processed with a classic beamforming technique and a high resolution algorithm to extract dominant paths. A ray-tracing based simulation tool has been used to understand measurement results. Obtained results are used for optimal placement of radio devices when deploying shipboard wireless networks. Keywords-propagation; channel sounding; ray-tracing; ships I

Analysis of DVB-H network coverage with the application of transmit diversity

This paper investigates the effects of the Cyclic Delay Diversity (CDD) transmit diversity scheme on DVB-H networks. Transmit diversity improves reception and Quality of Service (QoS) in areas of poor coverage such as sparsely populated or obscured locations. The technique not only provides robust reception in mobile environments thus improving QoS, but it also reduces network costs in terms of the transmit power, number of infrastructure elements, antenna height and the frequency reuse factor over indoor and outdoor environments. In this paper, the benefit and effectiveness of CDD transmit diversity is tackled through simulation results for comparison in several scenarios of coverage in DVB-H networks. The channel model used in the simulations is based on COST207 and a basic radio planning technique is used to illustrate the main principles developed in this paper. The work reported in this paper was supported by the European Commission IST project—PLUTO (Physical Layer DVB Transmission Optimization)

Comparison of measurements and simulations in indoor environments for wireless local networks at 60 GHz

International audienc