Measurements of reflection and transmission characteristics of interior structures of office building in the 60 GHz band

Sato, Kei; Manabe, Tetsuya; Ihara, T.; Saito, Hideki; Ito, Shinji; Tailaka, T.; Sugai, K.; Ohmi, Norichika; Murakami, Yasushi; Shibayama, Masashi; Konishi, Yoshihiko; Kimura, Tsuneto

doi:10.1109/pimrc.1996.567504

Cited by 29 publications

(29 citation statements)

References 7 publications

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“…Due to the discretized receiver positions, there are several receiver positions occupied by humans that cannot be covered, so the lower bound of outage probability is not equal to zero. The confidence intervals of the data are not (6,16,10,20) plotted in the figure for the sake of clarity, but the widest 95 % confidence interval is [−2.65, 1.93], which suggests acceptable accuracy. For all scenarios, a single isotropic antenna cannot provide sufficient signal strength to cover the entire room for a large range of SNR thresholds.…”

Section: Blanket and Selective Transmission Strategiesmentioning

confidence: 99%

“…It is reported in [6] that the visibility probability can be significantly improved by only two APs. A similar result is also found in our analysis of DAS systems with a small number of RAUs.…”

Section: The Number Of Rausmentioning

confidence: 99%

“…One practical solution is to transport the signals through reflective paths induced by large surfaces like walls. Although the reflective paths will introduce more attenuation, typically 15-20 dB [5] or even lower for some reflective materials [6], beamforming may be used to compensate this loss. But there is also the possibility that no reflective paths can be found since the reflections strongly depend on the physical environment, like the reflectivity of the walls and furniture.…”

Section: Introductionmentioning

confidence: 99%

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Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Wang

Debbarma

et al. 2014

Wireless Pers Commun

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The 60 GHz unlicensed frequency band has been adopted to support high data rate WLAN applications. The problem of this frequency band is that the wireless signal is vulnerable to the shadowing of objects. Especially in indoor scenarios, humans may frequently block the signal paths that cause disconnections of devices. This problem can be mitigated by using multiple antennas that can create rich signal paths between the devices. The idea presented in this paper is to employ a distributed antenna system (DAS) architecture enabled by radio-over-fiber technology to alleviate the shadowing problem. In the DAS architecture, multiple remote antenna units (RAUs), each of them equipped with an antenna array, are connected with the same WLAN access points via optical fibers. But there are questions that need to be answered, including the beamforming strategy with multiple RAUs, and the placement and the required number of the RAUs. These questions are related to factors like room size, population density, etc. We discuss these questions in this paper and present our findings through theoretical models and extensive simulations, which can be referred to for practical implementations. We find that the proposed 60 GHz DAS can significantly improve the link connectivity. Even when only two RAUs are used, the signal coverage can be improved to an acceptable percentage in heavy shadowing scenarios.

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Section: Blanket and Selective Transmission Strategiesmentioning

confidence: 99%

Section: The Number Of Rausmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Wang

Debbarma

et al. 2014

Wireless Pers Commun

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“…It was shown in [10] that the penetration loss of 9.6, 28.8 and 57.6 GHz waves increased by 25 dB to 50 dB when the glass surface was metal coated. The research in [10,11] also shows that no signal was detected through brick pillars throughout the mmWave signals, yet signals through a hollow plasterboard wall resulted in a penetration loss ranging between 5.4 dB and 8.1 dB. To overcome these loss mechanisms, higher gain, i.e., directional antennas, are necessary.…”

Section: Introductionmentioning

confidence: 99%

Improved Cell Search for mmWave Cellular Networks Using Deterministic Scanning Algorithm with Directional Array Antenna

2017

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Millimeter Wave (mmWave) communication is considered as an enabling technology for the next generation of cellular networks because it offers much larger bandwidth and higher data rate than the current lower-frequency cellular systems to satisfy the exponential growth of mobile data demand. High gain directional antennas are needed to overcome high propagation losses in mmWave bands. However, the reliance on highly directional antennas will result in a more complicated initial cell search procedure since both base station and mobile device have to look for each other over a large space to establish the link. This paper focuses on analyzing the performance of the directional cell search procedure where the base stations periodically transmit signals in a set of optimal directional patterns to scan the coverage area. The mobile terminals detect the signals from the base station using the Generalized Likelihood Ratio Test (GLRT). The results show that with an appropriate scanning scheme, the use of directional antennas can outperform their omnidirectional counterparts in terms of signal detection performance as well as total time required.

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“…In recent years there has been a growing interest in the development of potentially mass-producible application systems using millimeter waves, such as wireless LAN (local area networks) systems [1]. To develop millimeter-wave wireless LAN systems, however, we need to know the reflection and transmission characteristics in millimeter-wave bands so that we can evaluate indoor multipath propagation characteristics and the interactions of millimeter waves with various objects.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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Original scientific paperIn 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.Key words: MIMO-WLAN, Single CCI, Ray-tracing Approach, Channel Capacity Analiza kapaciteta MIMO WLAN sustava s jednom istokanalnom interferencijom. U ovom radu je izraču-nat kapacitet kanala bežične lokalne računalne mreže s više ulaza i više izlaza te jednom istokanalnom interferencijom. Pristup praćenja zrake je korišten za proračun frekvencijskog odziva kanala iz kojega je potom dobiven njegov kapacitet. Za svladavanje istokanalne interferencije za više-ulazno više-izlaznu bežičnu lokalnu računalnu mrežu istražena je mogućnost korištenja jednostavnog jednoliko rasporeîenog polja i polja s polarizacijskom različitosti. Takoîer su kvantificirani efekti prouzročeni dvama poljima antena za razmatrani sustav i istokanalnom interferencijom. Numerički rezultati pokazuju kako je polje s polarizacijskom različitosti bolji izbor od jednoliko rasporeîenog polja, uz prisutnu interferenciju.Ključne riječi: više-ulazno više-izlazna bežična lokalna računalna mreža, istokanalna interferencija, pristup praćenja zrake, kapacitet kanala

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Measurements of reflection and transmission characteristics of interior structures of office building in the 60 GHz band

Cited by 29 publications

References 7 publications

Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Improved Cell Search for mmWave Cellular Networks Using Deterministic Scanning Algorithm with Directional Array Antenna

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

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