Propagation Channel Interpolation for Fingerprint-Based Localization of Illegal Radios

Azril HANIZ  Gia Khanh TRAN  Ryosuke IWATA  Kei SAKAGUCHI  Jun-ichi TAKADA  Daisuke HAYASHI  Toshihiro YAMAGUCHI  Shintaro ARATA  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.12   pp.2508-2519
Publication Date: 2015/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.2508
Type of Manuscript: PAPER
Category: Sensing
propagation channel,  frequency interpolation,  spatial interpolation,  urban environment,  illegal radio,  localization,  fingerprint,  

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Conventional localization techniques such as triangulation and multilateration are not reliable in non-line-of-sight (NLOS) environments such as dense urban areas. Although fingerprint-based localization techniques have been proposed to solve this problem, we may face difficulties because we do not know the parameters of the illegal radio when creating the fingerprint database. This paper proposes a novel technique to localize illegal radios in an urban environment by interpolating the channel impulse responses stored as fingerprints in a database. The proposed interpolation technique consists of interpolation in the bandwidth (delay), frequency and spatial domains. A localization algorithm that minimizes the squared error criterion is employed in this paper, and the proposed technique is evaluated through Monte Carlo simulations using location fingerprints obtained from ray-tracing simulations. Results show that utilizing an interpolated fingerprint database is advantageous in such scenarios.