Radioeng Numerical Study on Indoor Wideband Channel 201312 (original) (raw)
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Antennas and Wireless Propagation Letters, 2000
This paper presents a modelling of Ultra-Wideband (UWB) indoor radio channel using the Finite-Difference Time-Domain (FDTD) method. By dividing the frequency band (3 -11 GHz) into eight sub-bands, the conventional FDTD method is applied to calculate the channel impulse responses (CIRs). At the centre frequency of each sub-band, measured frequency dependent dielectric constant/loss factor of different indoor materials are used and antenna patterns are taken into account by applying the equivalence principle with the total-field/scatteredfield approach. Radio channel modelling results show that the basestation antenna pattern variations at different frequencies can considerably influence the channel behaviour in a UWB indoor environment.
FDTD modeling and characterization of the indoor radio propagation channel in the 434 MHz ISM band
17th International Conference on Applied Electromagnetics and Communications, 2003. ICECom 2003., 2003
In this paper the fundamental aspects of indoor radio propagation are presented and the possibility to characterize a dynamic channel by means of a static model based on the Finite Difference Time Domain method (FDTD) is examined. A 3D office environment is simulated in the 434 MHz ISM band for the characterization of channel operation according to the dominating distortions. The obtained results, which are in agreement with the theoretical values, verify that the channel operation is slow flat fading with No ISI making the application of the spatial diversity the most appropriate scheme.
Measuring, modeling, and characterizing of indoor radio channel at 5.8 GHz
IEEE Transactions on Vehicular Technology, 2001
Wide-band indoor radio channel characterization for broadband radio access networks and unlicensed national information infrastructure has been performed at 5.8 GHz, and results are given in this paper. Delay spreads of 8.8 and 17.2 ns and coherence bandwidths of 9.6 and 4 MHz have been found for line-of-sight (LoS) and obstructed line-of-sight (OLoS) situations, respectively. Results have been compared with predictions made using a ray-tracing tool. To get accurate predictions, a good description of the electromagnetic properties of the obstacles present in the environment is needed. Several experiments were made in order to characterize the electromagnetic parameters of six typical building materials. Transmission and reflection coefficients were measured using the free-space technique. A multiple successive internal reflection model was used to estimate the permittivity and conductivity by comparing the measured and predicted values of the coefficients. Several samples of each material were measured, and the results vary from sample to sample. This variation has been characterized by the calculation of confidence bands for the parameters. The influence of both the dielectric parameters and the order of reflections considered in the ray-tracing tool has been analyzed. The effect is reduced on narrow-band predictions but is more important on wide-band parameters as the delay spread. It is shown that the measured delay spread cumulative distribution function falls within the band predicted using the measured maximum and minimum values of permittivity
2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2016
This paper demonstrates the application of the Finite-Difference Time-Domain method for dispersive media to indoor ultra-wideband channel modeling. A new description of the frequency dispersion of building materials, based on a partial-fraction approach, is proposed, utilizing experimentally measured data on complex permittivity values reported in the literature. The analytical dispersion model for a series of building materials is estimated through the Vector Fitting technique and the through-the-wall penetration is calculated for indicative cases. Finally, a small two-dimensional office environment is studied and several channel characteristics are calculated demonstrating the flexibility and robustness of the proposed formulation in communication modeling. The proposed FDTD implementation covers all the bandwidth in a single run instead of running simulations for every frequency or subband.
IJERT-A Novel Construction Technique for Reduction of Multipath Effects in Indoor Channels
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/a-novel-construction-technique-for-reduction-of-multipath-effects-in-indoor-channels https://www.ijert.org/research/a-novel-construction-technique-for-reduction-of-multipath-effects-in-indoor-channels-IJERTV3IS061639.pdf In this report the ultra wide band signals are more affected due to EM waves propagated through irregular shaped bodies such as walls, buildings and hill areas multipath effects, too. MPCs are analyzed for various cases with several antenna heights and distances. Path delays (due to propagation through walls and various paths of direct and reflected rays) and the ringing (similar to UWB propagation through wall) can be clearly observed and analyzed. This paper provides a new proposal where an antenna is used in (40-60GHz) frequency range to reduce the effect of Multipath path fading coefficients.
An Investigation on the Effects of Wall Parameters on the Indoor Wireless Propagations
2007 5th Student Conference on Research and Development, 2007
The type of the construction materials of the interior walls of the indoor environments plays a great role in the propagation of the transmitted signals inside the buildings. A comparison of calculated and simulated Fresnel reflection and transmitted coefficients at 2.4 GHz and 900 MHz for a variety of typical exterior building surfaces has been achieved. The effect of the different types of wall on the path loss prediction had been conducted by using a ray tracing program with real time reflection and refraction phenomena.
Measured wideband characteristics of indoor channels at centimetric and millimetric bands
EURASIP Journal on Wireless Communications and Networking, 2016
Accurate characterization of spatial multipath channels at millimeter wave bands has gained significant interest both in industry and academia. A channel measurement was conducted at three different frequency bands, i.e. 2−4 GHz, 14−16 GHz and 28−30 GHz in a line-of-sight (LOS) and an obstructed-LOS (O-LOS) scenarios in an empty room environment. A vector network analyzer connected to a virtual uniform circular array and to a rotational directional horn antenna was used in the measurements, respectively. Angle-of-arrivals and delay-of-arrivals of the multipath components were obtained from the measurements for the three frequency bands. Room electromagnetics properties for the three different frequencies at different propagation scenarios were investigated as well. Index Terms millimeter wave channel measurements, spatio-temporal channel modeling, room electromagnetics, angle of arrival estimation
Time dispersion analysis and capacity for ultra wideband channel in indoor environment
International Journal of Information and Communication Technology, 2017
In this paper, the ultra wideband (UWB) channel characterisation based on time dispersion analysis is presented. The UWB channel behaviour is different from narrowband and wideband channels due to the large bandwidth, which is the major concern for the channel capacity. In addition, the large bandwidth leads to increased channel variation. The channel characteristics and analysis are important to track the behaviour of UWB channel. The channel measurements were conducted in an indoor environment for UWB system in line-of-sight (LOS) scenario. Time dispersion parameters, namely, root mean squared (RMS) delay spread and mean excess (MN.EX) delay, are analysed based on these measurements. The effectiveness of multipath components is also investigated by means of the multipath gain (MG) and channel capacity. The presented results show that there is a correlation between RMS delay spread and transmitter-receiver (TX-RX) separation distance. The results also show that the best fitting for the RMS delay spread is the Weibull model and the maximum MG is 4.1 dB, which is calculated at the maximum TX-RX separation distance. The channel capacity of multipath components outperforms the capacity of the LOS path by 0.3 bps/Hz.
Characteristics of the indoor propagation channel in 1.9 GHz band
This paper presents results of propagation measurements carried out in the frequency range 1 8 2 0 1 8 2 0 1 8 2 0 GHz inside a building, using network analyser. Wideband properties of the channel, described through mean delay and delay spread, and a narrowband local statistics of the received power have been presented. For each transmitter and receiver antennas location two propagation cases have been considered, line of sight (LOS) and obstructed line of sight (NLOS) -the direct path component was attenuated by radio absorbing mat near the receiver.
Wide-band frequency domain measurement and modeling of indoor radio channels at 5GHz for future HIPERLAN system are presented. Vector Network Analyzer is used to measure the frequency response of the channel. Impulse response profiles a r e obtained by using inverse Fourier Transform. Empirical values of the RMS delay spread and number of multipath are tested for normal distribution using Anderson-Darling goodness of fit test and the statistics are presented. For most of the cases, RMS deIay spread d u e s showed good fit t o normal distribution, where as the number of multipath values rejected the null-hypothesis that it follows normal distribution. Statistics of the RMS delay spread, number of multipath and the coherence bandwidth are also presented.