Wideband impulse response measurements at 900 MHz and 1.7 GHz

Raekken, R.H.; Langaas, H.; Lovnes, G.; Paulsen, S.E.

doi:10.1109/glocom.1991.188580

Cited by 5 publications

(1 citation statement)

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“…The non-line-of-sight (NLOS) radio-frequency (RF) channel for ground communications in mountainous terrain exhibits multipathed and delayed behavior, causing intersymbol interference and equalization issues at the receiving station (Chuang 1987;Breton and Arcone 2015). Bistatic travel time between a transmitter (Tx) and receiver (Rx) is oftentimes tens of microseconds (de Weck et al 1988;Driessen 1990Driessen , 1991Driessen , 1992Driessen , 2000Raekken et al 1991;Mohr 1993;Sousa et al 1994) and can even exceed 100 µs in mountainous terrain (Driessen 1990;Raekken et al 1991). Typical forms of infrastructure, such as repeaters or cell towers, may not provide complete coverage, if such infrastructure exists at all, a common scenario encountered in areas of military conflict or in the backcountry.…”

Section: Introductionmentioning

confidence: 99%

Measuring the non-line-of-sight ultra-high-frequency channel in mountainous terrain : a spread-spectrum, portable channel sounder

Streeter¹,

Breton²,

Corgan³

2018

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The U.S. Army Engineer Research and Development Center (ERDC) solves the nation's toughest engineering and environmental challenges. ERDC develops innovative solutions in civil and military engineering, geospatial sciences, water resources, and environmental sciences for the Army, the Department of Defense, civilian agencies, and our nation's public good. Find out more at www.erdc.usace.army.mil. To search for other technical reports published by ERDC, visit the ERDC online library at http://acwc.sdp.sirsi.net/client/default.

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Section: Introductionmentioning

confidence: 99%

Measuring the non-line-of-sight ultra-high-frequency channel in mountainous terrain : a spread-spectrum, portable channel sounder

Streeter¹,

Breton²,

Corgan³

2018

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Delay spread measurements for the digital cellular channel in Toronto

Sousa

Jovanovic

Daigneault

1994

IEEE Trans. Veh. Technol.

138

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This paper describes a set of measurements performed in the Toronto area, in order to assess the impact of multipath propagation on the performance of the TIA IS-54 digital standard. Five existing cells were systematically surveyed: two in downtown Toronto, two in the suburbs, and one in a suburbanlrural area. A sweeping correlator apparatus with a 0.1 p s resolution and 910 MHz carrier frequency, and an omnidirectional antenna was used. In one of the cells, the measurements were repeated with a 60 degree beamwidth directional antenna. A fairly sophisticated thresholding technique was applied in order to reduce the impact of noise. Generally, the measurements with the omnidirectional antenna exhibit multipath propagation with considerably smaller excess delays than some reported recently, but are consistent with earlier results obtained in the U.S. and Europe. Sectorization was found to considerably reduce the multipath effects. Very large delay components appear to be due mostly to the combination of large transmitter-receiver distances and a large degree of shadowing, and could probably be avoided to a large extent by standard cellular engineering techniques. In view of these results, it seems that the long delay (high selectivity) problem has been somewhat overemphasized in the past, at least for areas like Toronto. Problems associated with short delays (flat fading), on the contrary, appear to have been underestimated in the case of dense urban environments.

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Modeling and performance evaluation of different CDMA schemes for terrestrial and satellite communication systems

Fantacci

Pazzaglia

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)

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Absrran -This paper deals with the modeling and performance evaluation of different Code Division Multiple Access schemes suitable for applications in terrestrial and satellite mobile communication networks. The paper is focused on the use of particular propagation channel models and the relative sensitivity of different demodulation schemes to their parameters. The main goal is to analyze how the increased interference level, typical of a multipath environment, can influence different demodulator architectures in different propagation conditions. Some issues concerning the characterization of the propagation channel models in the case. of the RAKE receiver are also investigated and discussed.

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Wideband impulse response measurements at 900 MHz and 1.7 GHz

Abstract: and 1.7 GHz have been performed i n l a r g e cells i n r u r a l and urban t e r r a i n , using a frequency sweep technique and correlation i n the receiver. S t a t i s t i c a l d i s t r i b u t i o n s of instantaneous mean delay, delay spread, delay window and delay i n t e r -

Cited by 5 publications

References 0 publications

Measuring the non-line-of-sight ultra-high-frequency channel in mountainous terrain : a spread-spectrum, portable channel sounder

Measuring the non-line-of-sight ultra-high-frequency channel in mountainous terrain : a spread-spectrum, portable channel sounder

Delay spread measurements for the digital cellular channel in Toronto

Modeling and performance evaluation of different CDMA schemes for terrestrial and satellite communication systems

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