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Frequency bands above 6GHz are receiving great attention for 5G mobile radio communications due to the potential availability of enormous channel bandwidths. Various multi-carrier and single-carrier waveforms are being considered as potential candidates for 5G radio interface. When evaluating the waveform performance at high carrier frequency and large bandwidths, the inclusion of realistic hardware...
Large absolute channel bandwidths at millimeter wave (mmWave) frequencies and more directional antenna gains may lead to quasi-deterministic (less random) channel fading behavior. Randomness in the cross polarization discrimination (XPD) is an attribute related to the channel fading behavior. In narrow-band channels, it is usually modeled as a log-normal random variable. From channel modeling perspectives,...
A wireless channel is always composed of both deterministic and stochastic multi-path components. A high Rician K-factor increases the contribution of deterministic channel components, thereby reducing the significance of stochastic parts of a channel. This paper focus at the investigative analysis of K-factor and fading depth to analyze the deterministic behavior of a channel under a certain bandwidth...
In the present paper we evaluate the performance of a hybrid digital/analog multi-beam beam-forming architecture with polarization and delay compensation using time reversal (TR). Double-directional, ultra wideband dual-polarized channel measurements at 70 GHz in a conference room have been used to emulate the channel. The use of multiple beams to mitigate human shadowing has been evaluated and the...
In the present paper we analyse small-scale fading of reflections at 60 GHz using different antennas and bandwidths. The aim is to investigate the deterministic property of the channel in view of modelling and deployment of systems with larger bandwidths and higher directivity. We have investigated the scattering effect of a reflection on a wall emulating a beam-former in a NLOS condition. The results...
If a channel is frequency dependent then Uncorrelated Scattering (US) (a narrow-band assumption) don't hold. This has a significant impact at the considered channel modeling methodology as delay and angular dispersion of waves can no longer be studied independently because the small scale fading of individual multipath components become correlated. In this paper, we investigate the frequency dependence...
Millimeter-wave frequencies between 6 and 100 GHz provide orders of magnitude larger spectrum than current cellular allocations and allow usage of large numbers of antennas for exploiting beamforming and spatial multiplexing gains. In this article, we describe the main design concepts when integrating mmWave RANs into 5G systems, considering aspects such as spectrum, architecture, and backhauling/fronthauling...
This paper gives a review of important aspects and current developments in 60 GHz broadband communication. We present channel measurement results for a conference room and analyze the channel capacity. The results clearly demonstrate the capability of the 60 GHz approach. Finally, we outline a concept for a wireless 60 GHz in-flight entertainment system.
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