Six time- and frequency- selective empirical channel models for vehicular wireless LANs

Acosta-Marum, Guillermo; Ingram, M.A.

doi:10.1109/mvt.2008.917435

Cited by 272 publications

(52 citation statements)

References 8 publications

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“…Empirical channel models in [26,27] reveal how maximum delay spread varies depending on different propagation models and traffic environments. For example, the RTV model for suburban street, urban canyon, and expressway have maximum excess delays of 700, 501, and 401 ns, respectively [26]. For the V2V model, measurements in [27] reveal that the 90% largest delay spread (found in urban areas) is near 600 ns, which is equivalent to 6 samples.…”

Section: 11p Signal and Channel Modelsmentioning

confidence: 99%

“…To avoid ISI, the maximum length of the FIR filter is derived by taking into account the guard interval and the CIR. By assuming that the delay spread of the vehicular channel is constrained to a maximum of 600 ns (as discussed in Section 2) based on the results stated in [26,27], the CIR is equivalent to 6 samples of the 802.11p guard interval (the sampling frequency of 802.11p is 10 MHz). Therefore, a remaining effective guard interval of 10 samples is available for filtering.…”

Section: Image Spectrum Cancellation By Fir Filtermentioning

confidence: 99%

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Spectrally efficient emission mask shaping for OFDM cognitive radios

Pham

Fahmy

McLoughlin

2016

Digital Signal Processing

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Orthogonal Frequency Division Multiplexing has been widely adopted in recent years due to its inherent spectral efficiency and robustness to impulsive noise and fading. For cognitive radio applications in particular, it can enable flexible and agile spectrum allocation, yet suffers from spectral leakage in the form of large side lobes, leading to inter-channel interference, unless mitigated carefully. Hence, recent OFDM-based standards such as 802.11p for vehicular communication and 802.11af for TV whitespace impose strict spectrum emission mask limits to combat adjacent channel interference. Stricter masks allow channels to operate closer together, improving spectral efficiency at the cost of implementation difficulty. Meeting the strict limits is a significant challenge for implementing both 802.11p and 802.11af, yet remains an important requirement for enabling cost-effective systems. This paper proposes a novel method that embeds baseband filtering within a cognitive radio architecture to meet the specification for the most stringent 802.11p and 802.11af masks, while allowing ten 802.11af sub-carriers to occupy a single basic channel without violating SEM specifications. The proposed method, performed at baseband, relaxes otherwise strict RF filter requirements, allowing the RF subsystem to be implemented using much less stringent 802.11a designs, allowing cost reductions.

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Section: 11p Signal and Channel Modelsmentioning

confidence: 99%

Section: Image Spectrum Cancellation By Fir Filtermentioning

confidence: 99%

Spectrally efficient emission mask shaping for OFDM cognitive radios

Pham

Fahmy

McLoughlin

2016

Digital Signal Processing

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“…According to the measurement results of [24] for the characterization of vehicular physical channels, in the carried out tests, we assume frequency-flat block-type Ricean fadings, with K Rice = 6.5 (dB) being the Ricean factor of the considered access channels, and N v ( j) (Watt/Hz) and l = 2 being the level of the receive noise power density spectrum and the path loss exponent of the j-th access channel, respectively. Finally, N v ( j) is tuned so as to have an average SNR j E{ h j 2 }/N v ( j) of 20 (dB) at the VC-to-RSU distance of 15.5 (m).…”

Section: Simulated Client Mobility Primary Activity Pattern Faded Amentioning

confidence: 99%

“…Data fusion phase: each VC(k), k ∈ C i (t) sends to the serving RSU(i) the set of probabilities in (24). Then, RSU(i) computes P i L (t) as in (26) and broadcast it over the served VCs.…”

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confidence: 99%

Distributed and adaptive resource management in Cloud-assisted Cognitive Radio Vehicular Networks with hard reliability guarantees

Cordeschi

Amendola

Shojafar

et al. 2015

Vehicular Communications

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“…Seit mehr als fü nf Jahren werden Funksysteme fü r ITS, sowohl in Ö sterreich als auch international, aktiv erforscht (Sen, Matolak, 2008;Renaudin, 2008;Paier et al, 2009;Kunisch, Pamp, 2008;Cheng et al, 2007;Acosta-Marum, Ingram, 2007;. Dieser Beitrag gibt eine allgemeine Einfü hrung in die Eigenschaften des Fahrzeugfunkkanals und beschreibt offene zukü nftige Forschungsfragen.…”

Section: Introductionunclassified

Funkkommunikation für intelligente Verkehrssysteme – Status und Ausblick

Zemen

Czink

Bernadó

et al. 2011

Elektrotech. Inftech.

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Dieser Beitrag gibt einen Ü berblick zur Funkkommunikation in intelligenten Verkehrssystemen (intelligent transport systems, ITS) und bietet einen Einblick in den IEEE 802.11p Standard. Die Ergebnisse umfangreicher Funkkanalmessungen von Fahrzeug zu Fahrzeug und von Fahrzeug zur Infrastruktur werden vorgestellt und die speziellen nicht stationä ren Eigenschaften des Schwundprozesses in der Fahrzeugkommunikation erklä rt. Neben den Messungen werden numerische Simulationsergebnisse iterativer Kanalsch€ atzmethoden fü r den Fahrzeugfunkkanal vorgestellt. Zusä tzlich durchgefü hrte Ü bertragungsexperimente auf Ö sterreichs Autobahnen zeigen den aktuellen Entwicklungsstand des IEEE 802.11p Standards. Basierend auf diesen Erkenntnissen gibt der Beitrag einen Ausblick auf mö gliche Weiterentwicklungen des IEEE 802.11p Standards, um eine verlä ssliche Kommunikation in zukü nftigen ITS zu gewä hrleisten. Schlü sselwö rter: Fahrzeugfunkkanal-Messungen und -Charakterisierung; IEEE 802.11p; zeitvariante Kanalschä tzung; Ü bertragungsexperimente Wireless communications for intelligent transport systems -current status and outlook.This article provides an overview of the current status of wireless communication systems for intelligent transport systems (ITS) and gives an introduction to the IEEE 802.11p standard. We present results from channel sounding experiments between two vehicles and from the vehicle to the infrastructure. Specifically, the non-stationary properties of the fading process in vehicular communication channels are explained. Additionally, we also present numerical simulation results of iterative channel estimation algorithms for the vehicular communication channel. Transmission experiments carried out on Austrians motorways exemplify the challenges faced by the IEEE 802.11p standard. Based on these insights we give an outlook on the future development potential of the IEEE 802.11p standard, such that dependable communication can be guaranteed for ITS systems of the next generation.

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Six time- and frequency- selective empirical channel models for vehicular wireless LANs

Cited by 272 publications

References 8 publications

Spectrally efficient emission mask shaping for OFDM cognitive radios

Spectrally efficient emission mask shaping for OFDM cognitive radios

Distributed and adaptive resource management in Cloud-assisted Cognitive Radio Vehicular Networks with hard reliability guarantees

Funkkommunikation für intelligente Verkehrssysteme – Status und Ausblick

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