Wireless LAN Comes of Age: Understanding the IEEE 802.11n Amendment

Paul, Thomas; Ogunfunmi, Tokunbo

doi:10.1109/mcas.2008.915504

Cited by 166 publications

(107 citation statements)

References 9 publications

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“…However, it can be generalized using the theory of orthogonal designs [21] to larger numbers of transmit antennas; for example four transmit antennas as in the IEEE 802.11n standard [22]. We start by developing a space time block coding (STBC) scheme for ZP-OFDM systems.…”

Section: Extension To Mimo-ofdm Systemsmentioning

confidence: 99%

A Sparsity-Aware Approach for NBI Estimation in MIMO-OFDM

Gomaa

Al-Dhahir

2011

IEEE Trans. Wireless Commun.

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Abstract-In this paper, we present a novel approach based on compressive sensing theory to estimate and mitigate asynchronous narrow-band interference (NBI) in orthogonal frequency division multiplexing systems with multiple transmit and/or multiple receive antennas. We consider the practical scenarios where one or multiple asynchronous NBI signals experience fast fading and/or frequency-selective fading channels. Furthermore, we propose a novel technique for estimating the desired signal's channel in the presence of unknown NBI. Our approach does not require any prior information about the NBI. Simulation results demonstrate the effectiveness of our proposed techniques in mitigating NBI and approaching the interferencefree performance limit over practical ranges of NBI power levels, spectral widths, and mobility levels.Index Terms-Narrow-band interference (NBI), OFDM, compressive sensing, sparsity, MIMO.

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Section: Extension To Mimo-ofdm Systemsmentioning

confidence: 99%

A Sparsity-Aware Approach for NBI Estimation in MIMO-OFDM

Gomaa

Al-Dhahir

2011

IEEE Trans. Wireless Commun.

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“…On the other hand, enabling the desired standards with the devices produced for specific purposes and fields leads to the necessity of providing suitable and safe wireless networks for users. The desire of users to connect to a network constantly makes activation of the wireless access points necessary [1]. In the university campuses, in many public spaces, workplaces and houses, it is quite possible to come across with wireless networks.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Improment Application in Computer Networks Installed in Historical Places

Albayrak¹,

Özalp²

2015

A P J Eng Sci

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ÖzetGünümüz bilgi toplumunda, bilgiye hızlı ve güvenli bir şekilde ulaşmak temel amaçtır. Bilgisayar ağları bilginin paylaşılmasında en sık kullanılan yoldur. Erişim ve paylaşım isteklerinin artması kullanıcıları yeni arayışlara götürmüştür. Artık insanlar mobilitenin sonucu olarak bilgisayar ağlarının bir parçası olmuştur. Son yıllarda ortaya çıkan IoE (her şeyin interneti) kavramı ile de bu durum pekiştirilmiştir. Her şeyin interneti dünyasında, günümüzdeki öğelerin %99'undan fazlasının bir bilgisayar ağına bağlı olmaması, gelecekte bilgisayar ağlarının önemini göstermektedir. Kablosuz ağlar, bu yapıda önemli bir rol oynamaktadır. Bilgisayar ağlarının fiziksel olarak yapılandırılamadığı ortamlarda, kablosuz teknolojiler kullanılmaktadır. Özellikle tarihi ve turistik mekânlarda yapılandırılan teknik alt yapı çalışmalarının zorlukları, kablosuz ağların vazgeçilmezliğini gösterir. Tarihi konaklar, hanlar, müze olarak kullanılan tarihi mekânlar, kaleler vb. ortamlarda yapılandırılacak olan bilgisayar ağlarında, kablosuz teknolojilerin kullanılması zorunluluğu, kullanılan topolojilerin verimliliğinin arttırılması noktasında önemlidir. Bu çalışmada dünya miras kenti, tarihi Safranbolu'da kurulan kablosuz mesh ağ ile verimlilik ve kullanılabilirlik çalışması yapılmıştır. AbstractIn today's information society, reaching information fast and safely is the primary purpose. Computer networks are the mostly used way to share information. The increase in access and sharing demands has caused the users to look for new things. Today, people have become a part of computer networks as a result of mobility. With the IoE (internet of everything) concept that has appeared in recent years, this perception has been reinforced. In the internet of everything world, 99% of the components are not connected to a computer network and this shows how important computer networks will be in the future. Wireless networks have an important role to play in this structure. In the environments where computer networks cannot be structured physically, wireless technologies are used. Particularly, the difficulties of setting up a technical infrastructure in historical and touristic settings show the necessity of wireless networks. In computer networks installed in historical mansions, inns, historical places used as museums, castles and such kind of places, the necessity of using wireless technologies is important in respect to the increase in the efficiency of the topology used. In this study, with wireless mesh network installed in historical Safranbolu, efficiency and usability study has been performed.

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“…802.11n has theoretical data rates up to 600 Mbps and a throughput between 20 Mbps to 200 Mbps in practice [2]. 802.11n has an increased range of reception due to reduced signal fading [2].…”

Section: Introductionmentioning

confidence: 99%

“…802.11n has an increased range of reception due to reduced signal fading [2]. The reduced fading is achieved partially through the use of improvement in coverage and capacity.…”

Section: Introductionmentioning

confidence: 99%

“…The reduced fading is achieved partially through the use of improvement in coverage and capacity. This is achieved through the use of Multiple Input and Multiple Output (MIMO) technology and Orthogonal Frequency Division Multiplexing (OFDM) [2]. OFDM converts a frequency-selective channel into a parallel collection of frequency flat sub-channels, and the receiver recovers the original signal by comparing all the sub-channels.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation on the Use of Itu-R P.1411-7 in 802.11N Path Loss Modelling

Priya¹,

Pillay²,

Saargunawathy³

et al. 2014

PIER Letters

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Abstract-Free space path loss modelling is a model used to model path loss propagation for Wireless Local Area Networks. In some cases, the estimation of path loss by the FSL model can be inaccurate as it does not take into account the effects of multipath propagation. The International Telecommunication Union Recommendation, ITU-R P.1411-7 provides prediction methods for the planning of short-range outdoor radio communication systems and radio local area networks in the frequency range of 300 MHz to 100 GHz. This recommendation further proposes a location variability correction, ρ, which models the standard deviation of field strength due to small scale fading. This paper investigates the feasibility of using the ITU-R P.1141-7 Recommendation to estimate the path loss for 802.11n signals experienced by pedestrians in a suburban environment. Received signal strengths were collected from field experiments, and the measured path loss was compared with estimated path loss values. The results show that for areas with high levels of small scale fading, the ITU-R P.1141-7 was able to estimate the path loss for IEEE 802.11n signals with a higher accuracy of 10 dB than the FSL model.

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Wireless LAN Comes of Age: Understanding the IEEE 802.11n Amendment

Cited by 166 publications

References 9 publications

A Sparsity-Aware Approach for NBI Estimation in MIMO-OFDM

A Sparsity-Aware Approach for NBI Estimation in MIMO-OFDM

Efficiency Improment Application in Computer Networks Installed in Historical Places

An Investigation on the Use of Itu-R P.1411-7 in 802.11N Path Loss Modelling

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