Wideband radio channel measurement system at 2 GHz

Kivinen, J.; Korhonen, Timo; Aikio, P.; Gruber, R. P.; Vainikainen, P.; Haggman, S.-G.

doi:10.1109/19.755057

Cited by 86 publications

(52 citation statements)

References 15 publications

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“…Out of the recorded channels for each TX position, the 2300 to be used in simulations (all TX positions, having a dynamic range more than 6 dB in the measurement, are used) were randomly selected. For single-user simulations nulling is utilized according to (9) with and have set a noise level to dB.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Since the DL interferer is unknown to the AP and generally not the same as in UL, nulling cannot be used in DL. In UL, nulling according to (9) is shown to provide a gain of about 1-2 dB for array sizes up to eight antennas. However, a strong interferer can in some cases manifest itself in the desired-user channel estimate even after nulling.…”

Section: Link-level Simulationsmentioning

confidence: 99%

“…Such measurements were performed at 5.3 GHz in two office buildings in the Helsinki area and at the Helsinki airport, during office hours, using the channel sounder of Helsinki University of Technology (HUT), Institute of Radio Communications (IRC) [9]. The environment, antenna configuration, settings of the sounder, as well as measurement and data-processing procedures are described in [10] for the first building (Ruoholahti) with a measurement area of about 40 m in diameter.…”

Section: Measured Indoor Radio Channelsmentioning

confidence: 99%

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Smart-antenna operation for indoor wireless local-area networks using OFDM

Alastalo

Kahola

2003

IEEE Trans. Wireless Commun.

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Abstract-This paper reports link-level Monte Carlo simulations for a system that is compatible with the physical layer of the 5-GHz IEEE 802.11a wireless-local-area network and utilizes an adaptive antenna array at the access point for single-user smart-antenna operation, as well as for space-division multiple access (SDMA). For the spatial indoor radio propagation channel, complex impulse-response recordings are used. These are obtained in wideband channel-sounder measurements in three different buildings at 5.3 GHz. Thus, no unrealistic assumptions about channel conditions are involved. The paper studies how the packet-error-rate performance for downlink (DL) is affected by time evolution of the radio channel that takes place after the uplink operation in which channel estimation is performed, and before DL operation in which the estimated channel information is utilized. Based on simulations two-user SDMA is possible with four-antenna elements under indoor propagation conditions and with six antennas three users can simultaneously be served. Delay spreads, coherence bandwidths, and correlation properties (in space, frequency, and polarization) of the radio channels obtained in the measurements are also discussed. The results suggest that indoor time-division-duplex systems with access-point-controlled scheduling are desirable communication systems which can benefit from SDMA.Index Terms-Adaptive arrays, indoor radio communication, radio propagation, space-division multiplexing, wireless local-area network (LAN).

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Link-level Simulationsmentioning

confidence: 99%

Section: Measured Indoor Radio Channelsmentioning

confidence: 99%

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Smart-antenna operation for indoor wireless local-area networks using OFDM

Alastalo

Kahola

2003

IEEE Trans. Wireless Commun.

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“…First this was done in [18]- [22], as an approach that introduces urban propagation mechanism based on 3-D high-resolution radio channel measurements carried out in different European cities, particularly in Helsinki (Finland) and Paris (France). This approach has analyzed the propagation mechanism using comprehensive classification of different types of wave propagation in urban scene.…”

mentioning

confidence: 99%

Signal Power Distribution in the Azimuth, Elevation and Time Delay Domains in Urban Environments for Various Elevations of Base Station Antenna

Blaunstein

Toeltsch²,

Laurila³

et al. 2006

IEEE Trans. Antennas Propagat.

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Abstract-We investigate signal power distribution in the azimuth-of-arrival, elevation-of-arrival and time-of-arrival domains for various positions of the base station antenna located below the rooftop as well as at rooftop level. This article is based on a multiparametric stochastic model we introduced in 2004, as combination of a statistical part, describing an array of buildings randomly distributed at the terrain, and a waveguide model, describing a grid of straight streets with buildings along them. Joint signal power distributions in azimuth-time delay and elevation-azimuth planes are obtained and compared to high-resolution 3-D measurements carried out in downtown Helsinki. A good agreement between theoretical predictions and the measurements is obtained basically, and also regarding the wave-guiding effect and antenna height dependencies. A satisfactory physical explanation, which accounts for the character of the specific building topography, the height and tilt of the antennas, is found. Finally, we present a numerical experiment of changing the base station antenna height, its directivity, and tilt. By this we show that the proposed stochastic approach allows to predict and control a-priori main parameters of smart antenna based only on knowledge of specific features of built-up terrain.

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“…For instance, wideband sounder at 2.4 GHz [69], wideband MIMO sounder at 5.8 GHz [70], a parallel receiver channel sounder for spatial and MIMO characterization [71], and a VNA-based MIMO channel sounder has been proposed for indoor measurements at 60 GHz [72]. The commercial sounder systems are also of interest and have been employed in a number of measurements, such as the SIMOCS 2000 produced by Siemens [73] …”

Section: Channel Soundersmentioning

confidence: 99%

Channel Measurement and Modeling in Complex Environments

Zhang¹

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Wideband radio channel measurement system at 2 GHz

Cited by 86 publications

References 15 publications

Smart-antenna operation for indoor wireless local-area networks using OFDM

Smart-antenna operation for indoor wireless local-area networks using OFDM

Signal Power Distribution in the Azimuth, Elevation and Time Delay Domains in Urban Environments for Various Elevations of Base Station Antenna

Channel Measurement and Modeling in Complex Environments

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