A novel wideband dynamic directional indoor channel model based on a Markov process

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Modified UWB Spatio-Temporal Channel Simulation Including Pulse Distortion and Frequency Dependence

A modified simulation of ultra-wideband (UWB) multipath channels, combined with cluster classification and physics based pulse distortion mechanisms, is proposed in this letter. Spatiotemporal characteristics of multipath clusters are specifically generated based on 3 x 3 planar array systems with regard to scenario types and are simulated over ten frequency subbands (2–11 GHz). Thus, frequency-dependent characteristics of the propagation channels are also investigated and compared between each scenario. Finally, the probability of the bit-error rate is determined to quantify distortion effects on UWB multipath channels for all frequency subbands.</p

Characterization, modeling and simulation of the MIMO propagation channel

International audienceThis article deals with several aspects relative to the MIMO propagation channel. Based on simulations and/or measurements, different approaches are used to model the propagation channel. These models are useful for the MIMO system design. Several studies are performed in order to realize realistic simulation of MIMO channel. Different measurement techniques are used in characterizing the propagation channel in various environments. Measurement campaigns made in different situations have been analyzed to obtain the relevant statistical parameters of the channel. Simulation of MIMO channel is then presented. Measurement and simulation results provide an evaluation of the capacity of MIMO channel. Obtained results show feasibility in the integration of MIMO techniques in practical wireless communication systems.Cet article traite de plusieurs aspects relatifs au canal de propagation MIMO. Différentes approches, basées sur des simulations et des mesures, utilisées pour modéliser le canal sont d’abord présentées. Ensuite, les différentes techniques de mesure utilisées dans le but de caractériser le canal de propagation dans divers milieux sont décrites. Des campagnes de mesures effectuées dans différents environnements sont analysées pour obtenir les paramètres statistiques du canal. Quelques problématiques liées à la simulation du canal MIMO sont évoquées notamment en lien avec une simulation réaliste dans des milieux complexes. Les résultats obtenus, en simulation comme en mesure, permettent une évaluation de la capacité du canal MIMO. Ces résultats permettent de discuter de l’intégration des techniques MIMO dans des systèmes de communication sans fil

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

On mm-Wave Multi-path Clustering and Channel Modeling

Efficient and realistic mm-wave channel models are of vital importance for the development of novel mm-wave wireless technologies. Though many of the current 60 GHz channel models are based on the useful concept of multi-path clusters, only a limited number of 60 GHz channel measurements have been reported in the literature for this purpose. Therefore, there is still a need for further measurement based analyses of multi-path clustering in the 60 GHz band. This paper presents clustering results for a double-directional 60 GHz MIMO channel model. Based on these results, we derive a model which is validated with measured data. Statistical cluster parameters are evaluated and compared with existing channel models. It is shown that the cluster angular characteristics are closely related to the room geometry and environment, making it infeasible to model the delay and angular domains independently. We also show that when using ray tracing to model the channel, it is insufficient to only consider walls, ceiling, floor and tables; finer structures such as ceiling lamps, chairs and bookshelves need to be taken into account as well

Der 60 GHz Indoor-Funkkanal - Herausforderungen menschlicher Abschattung

Driven by the ever increasing capacity of storage devices and HD video streaming applications, there will be a strong demand for wireless multi-Gbps consumer applications soon. Due to its large available bandwidth and the high allowed transmit power, the unlicensed frequency range around 60 GHz is proving ideal for the realization of such systems. During the development process of 60 GHz multi-gigabit wireless systems, a detailed knowledge of the radio channel is essential. Taking into account research gaps, this dissertation makes a significant contribution to knowledge in the field of 60 GHz channel characterization. The focus is on human shadowing and its influence on the channel characteristics, which leads to a high and time-variant path loss. In order to provide realistic results, sophisticated radio channel models are required for the 60 GHz range. In particular, they should include information in the spatial domain at the receiver and the transmitter as well as take into account time-varying human shadowing. The angular information is necessary in this case to evaluate smart antenna systems. Such comprehensive models are not yet available and therefore represent the major outcome of this dissertation.Wegen seiner großen verfügbaren Bandbreite und der hohen erlaubten Sendeleistung erweist sich der unlizensierte Frequenzbereich um 60 GHz als hervorragend geeignet für die Realisierung drahtloser Multi-Gigabit-Kommunikationssysteme. Während des Entwicklungsprozesses solcher Systeme ist eine detaillierte Kenntnis des Funkkanals unerlässlich. Unter Berücksichtigung offener Fragestellungen leistet die vorliegende Dissertation einen wesentlichen Beitrag zum Wissensstand auf dem Gebiet der 60-GHz-Kanalcharakterisierung. Im Vordergrund steht dabei die Abschattung durch Personen, die bei Trägerfrequenzen um 60 GHz zu einer hohen und gleichzeitig zeitvarianten Funkfelddämpfung führt. Um realistische Ergebnisse zu liefern, sind im 60-GHz-Bereich komplexe Funkkanalmodelle erforderlich, die insbesondere Winkelinformationen am Sender und Empfänger enthalten und die zeitvariante Abschattung durch Personen berücksichtigen sollten. Beides ist notwendig, um intelligente Antennensysteme evaluieren zu können. Solche umfassenden Modelle sind bisher nicht verfügbar und stellen deshalb das wesentliche Ziel dieser Dissertation dar

Der 60 GHz Indoor-Funkkanal - Herausforderungen menschlicher Abschattung

Driven by the ever increasing capacity of storage devices and HD video streaming applications, there will be a strong demand for wireless multi-Gbps consumer applications soon. Due to its large available bandwidth and the high allowed transmit power, the unlicensed frequency range around 60 GHz is proving ideal for the realization of such systems. During the development process of 60 GHz multi-gigabit wireless systems, a detailed knowledge of the radio channel is essential. Taking into account research gaps, this dissertation makes a significant contribution to knowledge in the field of 60 GHz channel characterization. The focus is on human shadowing and its influence on the channel characteristics, which leads to a high and time-variant path loss. In order to provide realistic results, sophisticated radio channel models are required for the 60 GHz range. In particular, they should include information in the spatial domain at the receiver and the transmitter as well as take into account time-varying human shadowing. The angular information is necessary in this case to evaluate smart antenna systems. Such comprehensive models are not yet available and therefore represent the major outcome of this dissertation.Wegen seiner großen verfügbaren Bandbreite und der hohen erlaubten Sendeleistung erweist sich der unlizensierte Frequenzbereich um 60 GHz als hervorragend geeignet für die Realisierung drahtloser Multi-Gigabit-Kommunikationssysteme. Während des Entwicklungsprozesses solcher Systeme ist eine detaillierte Kenntnis des Funkkanals unerlässlich. Unter Berücksichtigung offener Fragestellungen leistet die vorliegende Dissertation einen wesentlichen Beitrag zum Wissensstand auf dem Gebiet der 60-GHz-Kanalcharakterisierung. Im Vordergrund steht dabei die Abschattung durch Personen, die bei Trägerfrequenzen um 60 GHz zu einer hohen und gleichzeitig zeitvarianten Funkfelddämpfung führt. Um realistische Ergebnisse zu liefern, sind im 60-GHz-Bereich komplexe Funkkanalmodelle erforderlich, die insbesondere Winkelinformationen am Sender und Empfänger enthalten und die zeitvariante Abschattung durch Personen berücksichtigen sollten. Beides ist notwendig, um intelligente Antennensysteme evaluieren zu können. Solche umfassenden Modelle sind bisher nicht verfügbar und stellen deshalb das wesentliche Ziel dieser Dissertation dar