Short Range Propagation Model for a Very Wideband Directive Channel at 5.5 GHZ Band

Ahmed, Bazil Taha; Campillo, David Fernandez; Masa‐Campos, José Luis

doi:10.2528/pier12060509

Cited by 10 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When H − h < 0.6 √ λl v , the near shadowing phenomenon should be considered; when H − h > 0. 6 √ λl v , no near shadowing phenomenon occurs. Figure 4(a) shows the measured received power when the train is in the subway tunnel at 2.4 GHz [13].…”

Section: Statistical Modeling In Near Shadowing Zonementioning

confidence: 99%

“…In order to respond to the growing demand for high-performance radio communication systems in complex environments, a number of contributions have been made to predict the propagation characteristics in the last decades [1][2][3][4][5][6][7][8][9][10][11][12]. As one of the most common environments, a tunnel can generate various specific mechanisms when the electromagnetic wave propagates inside it.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Five-Zone Propagation Model for Large-Size Vehicles Inside Tunnels

Guan¹,

Zhang²,

Ai³

et al. 2013

PIER

View full text Add to dashboard Cite

Abstract-An accurate characterization of the wave propagation inside tunnels is of practical importance for the design of advanced communication systems. This paper presents a five-zone propagation model for large-size vehicles inside tunnels. Compared with existing models, the proposed model considers the influence of the large size of the vehicle, and covers all propagation mechanism zones and their dividing points. When a large-size vehicle is passing the transmitter, the received power suffers a deep fading as the direct wave is blocked by the vehicle itself. This zone is called the near shadowing zone. Then, when the vehicle has moved past the transmitter, the line of sight is recovered. If the vehicle is still close to the transmitter, the free space propagation zone starts. Then, as the distance increases, the vehicle enters the multi-mode propagation zone, where higher order modes are significant. Further away, when high order modes are greatly attenuated, guided propagation is stabilized. Finally, when the vehicle is extremely far from the transmitter, the waveguide effect vanishes because of the attenuation of reflected rays. Two sets of measurements are employed to validate the model. Results show good agreement, and therefore, the model presents an effective way to predict the propagation inside tunnels for large-size vehicles.

show abstract

Section: Statistical Modeling In Near Shadowing Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Five-Zone Propagation Model for Large-Size Vehicles Inside Tunnels

Guan¹,

Zhang²,

Ai³

et al. 2013

PIER

View full text Add to dashboard Cite

show abstract

“…The massive test results on the multipath propagation characteristics of radio signal at indoor and outdoor show that if a transmission terminal transmits a pulse signal through multipath channel, its reception terminal may receive several pulse signals [1][2][3][4][5][6]. The delay-spread of each pulse and the number of pulses are all different; the delay-spread causes the narrowing down of the relevant bandwidth of a channel.…”

Section: Introductionmentioning

confidence: 99%

A Synchronous Wideband Frequency-Domain Method for Long-Distance Channel Measurement

Hu¹,

Zhou²,

Guo³

2013

PIER

View full text Add to dashboard Cite

Abstract-This paper proposes a novel synchronous wideband frequency domain method for measuring time domain response of longdistance channel. Its core consists of: (1) baseband signal generators at the transmission terminal and the reception terminal respectively are used to generate the wideband signal of the same frequency; (2) the two GPS clock frequency reference sources locked on the same satellite are used to yield the high-stability 10 MHz signal as the external reference source of the baseband signal generator so that the initial phases of the wideband signals are basically the same; (3) the pulse per second (PPS) signal generated by the GPS clock frequency reference source is used as trigger signal to ensure that the baseband signal generator and the vector network analyzer (VNA) can transmit and receive signals synchronously; (4) the time domain response of the channel is indirectly obtained through the inverse Fourier transform of amplitude and phase of the frequency domain response. To verify the measurement method, experiments were performed, in which the sea surface evaporation waveguide which is tens of kilometers apart from each other was selected as the channel. The experimental results, given in Figs. 4 and 5, and their analysis show that the measurement method can obtain amplitude and phase of the signal whose band is hundreds of MHz and whose equivalent pulse width reaches 5 ns. The measurement method is used to obtain the time domain response of the long-distance channel, verifying that the measurement method is effective.

show abstract