A statistical model of urban multipath propagation

Turin, G.; Clapp, F.D.; Johnston, T.L.; Fine, S.B.; Lavry, D.

doi:10.1109/t-vt.1972.23492

Cited by 613 publications

(258 citation statements)

References 8 publications

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“…In RT techniques, each ray is considered to be an infinite bandwidth optical ray. This representation of MPCs is also in line with the channel model that was first proposed by Turin [10] and is well suited to describe RF propagation in multipath-rich indoor environments. The general multipath channel can be given as…”

Section: Indoor Propagation and The Proposed Aoa Modelsupporting

confidence: 73%

A Novel Statistical AOA Model Pertinent to Indoor Geolocation

Akgül¹,

Pahlavan²

2010

JGIS

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Abstract:A novel statistical angle-of-arrival (AOA) model for indoor geolocation applications is presented. The modeling approach focuses on the arrivals of the multipath components with respect to the line-of-sight (LOS) path which is an important component especially when indoor geolocation applications are considered. The model is particularly important for indoor applications where AOA information could be utilized for tracking indirect paths to aid in precise ranging in harsh and dense multipath environments where LOS path might be blocked due to obstructions. The results have been obtained by a measurement calibrated ray-tracing (RT) tool.

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Section: Indoor Propagation and The Proposed Aoa Modelsupporting

confidence: 73%

A Novel Statistical AOA Model Pertinent to Indoor Geolocation

Akgül¹,

Pahlavan²

2010

JGIS

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“…is the gamma function [14]. We assume a negative exponentially decaying multipath intensity profile given by [15,16] …”

Section: System Modelmentioning

confidence: 99%

Analytical bit error rate performance of DS-CDMA ad hoc networks using large area synchronous spreading sequences

2007

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The performance of large area synchronous (LAS) direct sequence code division multiple access (DS-CDMA) assisted ad hoc networks is investigated in the context of a single-hop infinite mesh of rectilinearly located ad hoc nodes. It is shown that LAS DS-CDMA exhibits a significantly better performance than the family of traditional spreading sequences used in a quasisynchronous DS-CDMA scenario having a low number of resolvable multipath components and a sufficiently high number of RAKE receiver branches. The benefits of LAS codes in ad hoc networks are multifold: (i) Their performance is noise-limited, rather than interference-limited, provided that the multipath and multi-user interference arrives within their interference free window. (ii) Under the same conditions LAS codes are robust against the 'near -far' effects imposed by ad hoc networks operating without base-station-aided power control, without accurate synchronisation and without implementationally complex interference cancellers. IntroductionThe family of large area synchronous (LAS) [1] spreading codes exhibits an interference free window (IFW), where the off-peak aperiodic auto-correlations and crosscorrelations become zero [2]. These attractive correlation properties assist us in eliminating the effects of both the multipath interference (MPI) and multiple access interference (MAI). Initial comparative studies between LAS-CDMA and traditional code division multiple access (CDMA) were presented, for example in [1]. LAS codes are generated by combining large area (LA) [3,4] codes and loosely synchronous (LS) [4,5] codes. Li [3] proposed various construction schemes for LA codes and analysed the performance of LA-CDMA, which exhibited higher spectral efficiency than traditional CDMA. Stanczak et al. [5] focused their attention on contriving systematic methods for the construction of LS codes. Choi and Hanzo [6] investigated the design of efficient and flexible LAS codes having an increased duty ratio, which resulted in a higher number of codes and hence a higher number of supported users than previous designs. An entire LAS-CDMA network was studied in [7]. For the detailed construction methods of LA, LS and LAS codes please refer to [3 -5].Again, as a benefit of having an IFW, LAS codes have the ability to support asynchronous operation in ad hoc networks, provided that both the propagation delay and the multipath-induced dispersion are limited to the duration of the IFW. If this condition is satisfied, the system's performance becomes essentially noise-limited, rather than interference-limited. Ad hoc networks have been studied for decades and have evolved to sensor networks and mesh networks [8,9], both of which potentially support a large number of nodes in the network. Although the application of LAS codes in cellular networks is limited by the low number of available spreading codes, this impediment is less restrictive in ad hoc networks, since the nodes only communicate with their neighbours. In this paper, we will focus our attention...

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“…Indeed, constant PDPs have been used to study various aspects of spread spectrum systems [24]- [29]. Propagation measurements in urban and suburban environments [30]- [32] and mountainous terrain [33] support such a PDP, since they show that these channels spread the energy over a continuum of arrival times. Thus, this paper employs a basic model to analyze the performance of an acquisition system operating in dense multipath environments.…”

Section: System Modelmentioning

confidence: 99%

On the Performance of Wide-Bandwidth Signal Acquisition in Dense Multipath Channels

Suwansantisuk

Win

Shepp

2005

IEEE Trans. Veh. Technol.

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Abstract-This paper investigates important properties of acquisition receivers that employ commonly used serial-search strategies. In particular, we focus on the properties of the mean acquisition time (MAT) for wide bandwidth signals in dense multipath channels. We show that a lower bound of the MAT over all possible search strategies is the solution to an integer programming problem with a convex objective function. We also give an upper bound expression for the MAT over all possible search strategies. We demonstrate that the MAT of the fixed-step serial search (FSSS) does not depend on the timing delay of the first resolvable path, thereby simplifying the evaluation of the MAT of the FSSS. The results in this paper can be applied to design and analysis of fast acquisition systems in various wideband scenarios.

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A statistical model of urban multipath propagation

Cited by 613 publications

References 8 publications

A Novel Statistical AOA Model Pertinent to Indoor Geolocation

A Novel Statistical AOA Model Pertinent to Indoor Geolocation

Analytical bit error rate performance of DS-CDMA ad hoc networks using large area synchronous spreading sequences

On the Performance of Wide-Bandwidth Signal Acquisition in Dense Multipath Channels

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