Impact of the radio channel on the performance of digital mobile communication systems

Abstract-This paper describes a comprehensive statistical model for UWB propagation channels that is valid for a frequency range from 3-10 GHz. It is based on measurements and simulations in the following environments: residential indoor, office indoor, built-up outdoor, industrial indoor, farm environments, and body area networks. The model is independent of the used antennas. [7] developed the concept of time-hopping impulse radio (TH-IR) systems. In 2002, the frequency regulator in the USA allowed unlicensed UWB transmission (subject to the fulfillment of a spectral masks), and other countries are expected to follow suit. One of the most promising applications for UWB are sensor networks, where the good ranging and geolocation capabilities of UWB [8] are particularly useful. The data rates for those applications are typically low (<1 Mbit/s). Recognizing these developments the IEEE has established the standardization group 802.15.4a, which is currently in the process of developing a standard for these applications.The ultimate performance limits of any communications system are determined by the channel it operates in. For a UWB system, this is the UWB propagation channel, which differs from conventional (narrowband) propagation in many respects. The performance of a system thus can only be evaluated when realistic channel models are available. A number of UWB channel models have been proposed in the past: [9] suggested a model for the frequency range below 1 GHz (this model was adopted by the 802.15.4a group for testing of low-frequency UWB systems). The IEEE 802.15.3a group developed a channel model [10] that is valid from 3 − 10 GHz, but is designed only for indoor residential and office environments, and the distance between transmitter and receiver is restricted to < 10 m.

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“…We define the frequency-dependent path gain (related to wideband path gain [16], [17]) in a UWB channel as…”

Section: B Pathgainmentioning

confidence: 99%

A comprehensive model for ultrawideband propagation channels

Molisch¹,

Balakrishnan²,

Cassioli³

et al. 2005

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

108

116

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“…It thus makes sense to define a frequency-dependent pathloss (related to wideband pathloss suggested in Refs. [1], [2])…”

Section: A Pathloss -Preliminary Commentsmentioning

confidence: 99%

Positioning Method of Mobile Nodes Supported by Anchors Outside of Walls

Ahn¹,

Kang²,

Seol³

2019

kics

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This is a discussion document for the IEEE document of the IEEE 802.15.4a channel modeling subgroup. It provides models for the following frequency ranges and environments: for UWB channels dovering the frequency range from 2 to 10 GHz, it covers indoor residential, indoor office, industrial, outdoor, and open outdoor environments (usually with a distinction between LOS and NLOS properties). For the frequency range from 2 to 6 GHz, it gives a model for body area networks. For the frequency range from 100 to 900 MHz, it gives a model for indoor office-type environments. Finally, for a 1MHz carrier frequency, a narrowband model is given. The document also provides MATLAB programs and numerical values for 100 impulse response realizations in each environment. in Appendix B, and general procedures for the measurement and the evaluation of the data, as recommended by the modeling subgroup are contained in Appendix C. B. Environments From the "call for applications", we derived a number of environments in which 802.15.4a devices should be operating. This list is not comprehensive, and cannot cover all possible future applications; however, it should be sufficient for the evaluation of the model: 1) Indoor residential: these environments are critical for "home entworking", linking different applicances, as well as danger (fire, smoke) sensors over a relatively small area. The building structures of residential environments are characterized by small units, with indoor walls of reasonable thickness. 2) Indoor office: for office environments, some of the rooms are comparable in size to residential, but other rooms (especially cubicle areas, laboratories, etc.) are considerably larger. Areas with many small offices are typically linked by long corridors. Each of the offices typically contains furniture, bookshelves on the walls, etc., which adds to the attenuation given by the (typically thin) office partitionings. 3) Industrial environments: are characterized by larger enclosures (factory halls), filled with a large number of metallic reflectors. This is ancticipated to lead to severe multipath. 4) Body-area network (BAN): communication between devices located on the body, e.g., for medical sensor communications, "wearable" cellphones, etc. Due to the fact that the main scatterers is in the nearfield of the antenna, and the generally short distances, the channel model can be anticipated to be quite different from the other environments. 5) Outdoor. While a large number of different outdoor scenarios exist, the current model covers only a suburban-like microcell scenario, with a rather small range. 6) Agricultural areas/farms: for those areas, few propagation obstacles (silos, animal pens), with large dististances in between, are present. Delay spread can thus be anticipated to be smaller than in other environments Remark 1: another important environments are disaster areas, like propagation through avalanches in the model, for the recovery of victims. Related important applications would include propagation through rubble...

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“…Fuente: Modern Wireless Communications [16]. (7) En donde V es la amplitud del voltaje de la envolvente compleja desvanecida en el trayecto y 2 = P 0 /2, entonces el valor eficaz…”

Section: (6)unclassified

“…Periódicamente el grupo de soporte 802.15.4a del Instit uto de Ingenieros Eléctricos y Electrónicos (Institute of Electrical and Electronics Engineers, IEEE) realiza recomendaciones sobre el modelado de las pérdidas de señal en el canal de comunicaciones, en las bandas de frecuencia del estándar IEEE 802.15.4 [6]. Los modelos de pérdidas básicamente están definidos en función de la distancia, la frecuencia y el entorno [7], [8].…”

Section: Introductionunclassified

Análisis de cobertura de redes basadas en el estándar 802.15.4

2013

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El artículo presenta un análisis de las pérdidas de señal en redes inalámbricas soportadas en el estándar 802.15.4, este análisis se basa en el concepto de balance de potencia, el modelo simplificado de pérdidas y las funciones de distribución de probabilidad de Gauss y Rayleigh. El estudio se realiza a un conjunto de medidas de intensidad de señal recibida, tomadas en una red de prueba en la banda de frecuencia de 2400 MHz, en un ambiente tipo oficina, con el objetivo de determinar modelos matemáticos que describan las pérdidas de señal y, con éstos poder realizar la correcta planificación de este tipo de redes al determinar el radio de cobertura de un transmisor.Palabras clave: modelos, pérdidas de señal, telecomunicación, ZigBee.

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Impact of the radio channel on the performance of digital mobile communication systems

Cited by 8 publications

References 6 publications

A comprehensive model for ultrawideband propagation channels

A comprehensive model for ultrawideband propagation channels

Positioning Method of Mobile Nodes Supported by Anchors Outside of Walls

Análisis de cobertura de redes basadas en el estándar 802.15.4

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