Exploiting Diversity for Coverage Extension of Bluetooth-Based Mobile Services
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Exploiting Diversity for Coverage Extension of Bluetooth-Based Mobile Services Barbara M. Masini,1 Andrea Conti,2 Davide Dardari,1 and Gianni Pasolini1 1 WiLab, 2 WiLab,
IEIIT-BO/CNR, University of Bologna, Viale Risorgimento 2, Bologna 40136, Italy ENDIF, University of Ferrara, Via Saragat 1, Ferrara 44100, Italy
Received 21 October 2005; Revised 25 July 2006; Accepted 16 August 2006 Recommended for Publication by Athina Petropulu This paper investigates the impact of diversity reception techniques on the performance of Bluetooth (BT) packet transmission in wireless channels with fast fading and shadowing to improve the coverage extension. We firstly derive a tight parametric exponential approximation for the instantaneous bit error probability (BEP) in additive white Gaussian noise with parameters dependent on GFSK modulation format according to the BT standard. Then, from this expression, we derive the mean block error probability (BLEP) for DH packets transmission in Rayleigh fading channel by adopting different diversity reception techniques, such as selection diversity (SD) and maximal ratio combining (MRC). In particular, the joint impact of the diversity order, the combining techniques and the block length on the BLEP, is shown. For both MRC and SD schemes, we also obtain a tight and invertible bound on the BLEP, that enables us to analytically evaluate the quality of service expressed in terms of outage probability in channel affected by fading and shadowing and, as a consequence, the impact of multiple antennas on the system coverage. Copyright © 2006 Barbara M. Masini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
1.
INTRODUCTION
In the last years, one of the main challenges faced by wireless networks is to offer new services for mobile virtual immersive communication in order to support context-aware applications in heterogeneous environments exchanging information with users (several national projects on immersive systems are under development in the last years. For instance, we are involved in the virtual immersive communications (VICOM) project [1]). Immersive and context-aware communication services, offered by islands of wireless nodes in indoor and outdoor environments, are going to play an important role in beyond 3G multimedia mobile communications requiring the development of reliable radio communication technologies, wireless networks, and mobile devices replacing cables and serving real-time processes. In such a scenario, bluetooth (BT) wireless technology is assuming an increasing importance over the years, supporting a large number of possible applications and services, which may be used in industrial and medical fields, mobile e-commerce, home networking, localization, and so forth. In fact, the BT system represents the most recent development in the direction of reliable, low cost, and efficient short
range radio comm
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