Analysis of the RMS delay spread of indoor radio propagation channels

Hashemi, H.; Tholl, D.

doi:10.1109/icc.1992.268160

Cited by 32 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the proposed model in does not contain the information about the antenna height. The RMS delay spread ( τ rms ) is a linear function of the path loss ( PL ), which has been shown in Refs . A path‐loss model with antenna‐height dependence was studied in our previous work .…”

Section: Modeling and Validationmentioning

confidence: 88%

Antenna‐height‐dependent delay spread model under indoor stair environment for small cell deployment in future mobile communications

Liu

et al. 2015

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

A novel measurement-based antenna-height-dependent statistical root-mean-square (RMS) delay spread model under indoor stair environment is proposed. In this model, the RMS delay spread is described as a log-normal random variable with antennaheight-dependent parameters in both line-of-sight (LOS) and the non-LOS (NLOS) areas. The environmental independence of the RMS delay spread distribution is shown first. Then, the parameters of the proposed model are extracted using least-squares and maximum likelihood estimation. The accuracy of the proposed model is verified by the extensive measured data, and the mean values of the RMS delay spread are compared with those in other related works. Finally, the interdependence of RMS delay spread and the coherence bandwidth is investigated. The proposed model can be applied to the physical layer designs of small cells in future 5G and ubiquitous mobile communication systems.

show abstract

Section: Modeling and Validationmentioning

confidence: 88%

Antenna‐height‐dependent delay spread model under indoor stair environment for small cell deployment in future mobile communications

Liu

et al. 2015

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

show abstract

“…The time characteristics of channel profiles have been used in literature for variety of applications [14][15][16]. RMS delay spread and mean excess delay are being used to determine the data-rate in the communication systems.…”

Section: B Time Metricsmentioning

confidence: 99%

Neural Network Assisted Identification of the Absence of Direct Path in Indoor Localization

Heidari

Akgül

Alsindi

et al. 2007

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference

View full text Add to dashboard Cite

Time of Arrival (TOA) based indoor positioning systems are considered to be the high precision alternatives to other positioning systems employing received signal strength (RSS) or Angle of Arrival (AOA). However, such systems suffer from the blockage of the direct path (DP) and occurrence of undetected direct path (UDP) condition and their performance degrades drastically in such conditions. Erroneous detection of the other multipath components (MPCs) as DP, which is the indicator of the true distance between the transmitter and the receiver, will introduce substantial ranging and localization errors into the system. Therefore, identification of the occurrence of large ranging errors and absence of DP from the received radio signal is our subsequent concern. After identification, the second step is to remedy the ranging errors in such UDP conditions. In this paper we present a methodology, based on an application of artificial neural network (ANN) design, to identify the UDP conditions and mitigate the ranging error using statistics extracted from wideband frequency domain indoor measurements conducted in a typical office building. The system bandwidth used for the frequency domain measurement was 500 MHz centered around 1 GHz.

show abstract

“…The time characteristics of channel profiles have been used in literature for variety of applications in communication field [21][22][23]. RMS delay spread and mean excess delay are being used to determine the data-rate of the communication systems in indoor and outdoor environment.…”

Section: Time Metricsmentioning

confidence: 99%

Identification of the Absence of Direct Path in ToA-Based Indoor Localization Systems

Heidari

Pahlavan

2008

Int J Wireless Inf Networks

View full text Add to dashboard Cite

Ultra-wideband (UWB) indoor positioning systems based on time of arrival (ToA) techniques are considered to be the high precision alternatives to those employing received signal strength (RSS) or angle of arrival (AoA) due to their superior time-domain resolution. However, the performance of such systems may easily be degraded by the blockage of the direct path (DP) and occurrence of undetected direct path (UDP) condition. By erroneous detection of the other multipath components (MPCs) as DP, which is the indicator of the true distance between the transmitter and the receiver, substantial localization errors will be introduced into the system. Hence, detection of DP categorizes the receiver locations into two main classes of detected direct path (DDP) and undetected direct path (UDP). The real challenge is to be able to identify the class of the receiver location; therefore, to remedy the ranging measurement in UDP condition. In this paper we propose a methodology to identify and mitigate the UDP conditions, which can substantially improve the overall indoor positioning accuracy.

show abstract

Analysis of the RMS delay spread of indoor radio propagation channels

Cited by 32 publications

References 14 publications

Antenna‐height‐dependent delay spread model under indoor stair environment for small cell deployment in future mobile communications

Antenna‐height‐dependent delay spread model under indoor stair environment for small cell deployment in future mobile communications

Neural Network Assisted Identification of the Absence of Direct Path in Indoor Localization

Identification of the Absence of Direct Path in ToA-Based Indoor Localization Systems

Contact Info

Product

Resources

About