Proceedings ArticleDOI
Indoor channel measurements and capacity evaluation with directional antennas
Xiaoya Zuo,Ding Wang +1 more
- pp 257-258
TLDR
UWB indoor channels extracted from practical measurements with omnidirectional antenna are combined with circular horn antenna to evaluate the channel capacity in the line of sight (LOS) environments and in the non-line of Sight (NLOS) environments.Abstract:
Recently UWB beamforming attracts significant research attention to obtain spatial gain in the form of antenna array. It is commonly believed that directional antenna based communication could improve the system performance. In order to further make clear the relationship between system performance and the antenna radiation pattern, UWB indoor channels extracted from practical measurements with omnidirectional antenna are combined with circular horn antenna to evaluate the channel capacity. In the line of sight (LOS) environments, the channel capacity increases with the antenna beamwidth decreasing and is always larger than that of omnidirectional antenna. However in the non-line of sight (NLOS) environments, the capacity is not always better with directional antenna. And the change consistency between the capacity and the antenna beamwidth disappears. This reminds us that when antenna beamforming is used to obtain array gain, the beamwidth should be carefully designed to obtain optimal performance, especially in the NLOS environments.read more
References
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Proceedings ArticleDOI
The effects of antenna directivity on path loss and multipath propagation in UWB indoor wireless channels
TL;DR: In this paper, the effects of antenna directivity on path loss and multipath propagation in the ultra wideband (UWB) indoor channel are analyzed for different transmitter/receiver (Tx/Rx) antenna combinations in the 2 GHz to 6 GHz frequency band.
Journal ArticleDOI
FDTD Characterization of UWB Indoor Radio Channel Including Frequency Dependent Antenna Directivities
Yan Zhao,Yang Hao,Clive Parini +2 more
TL;DR: In this paper, the authors present a modeling of the ultrawideband (UWB) indoor radio channel using the finite-difference time-domain (FDTD) method.
Proceedings ArticleDOI
FDTD Characterisation of UWB Indoor Radio Channel Including Frequency Dependent Antenna Directivities
Yan Zhao,Yang Hao,Clive Parini +2 more
TL;DR: In this article, the authors presented a modeling of the UWB indoor radio channel using the Finite Difference Difference Time Domain (FDTD) method by dividing the frequency band (3 - 11 GHz) into 8 sub-bands, the conventional FDTD method is applied to calculate the channel impulse responses (CIRs) at different subbands at the centre frequency of each sub-band, measured frequency dependent dielectric constant/loss factor of different indoor materials are used and antenna patterns are taken into account by applying the equivalence principle with the total field/scattered field
Proceedings ArticleDOI
Space-Time-Frequency Characterization of 3D Non-Isotropic MIMO Multicarrier Propagation Channels Employing Directional Antennas
TL;DR: A new model for multiple-input multiple-output (MIMO) multicarrier channels in a 3D scattering medium describes the cross-correlation function (CCF) between two sub-channels of an outdoor MIMO channel employing directional antennas in the presence of non-isotropic wave propagation in the 3D space.
Journal ArticleDOI
Space-Time-Frequency Characterization of 3D Nonisotropic MIMO Multicarrier Propagation Channels Employing Directional Antennas
TL;DR: This paper proposes a new model for multiple-input multiple-output (MIMO) multicarrier propagation channels in a three-dimensional (3D) environment and describes the cross-correlation function (CCF) between two subchannels of an outdoor MIMO channel employing directional antennas and in the presence of nonisotropic wave propagation in 3D space.
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