Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Exploiting Diversity for Coverage Extension of Bluetooth-Based Mobile Services | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 78954 Pages 1-9 DOI WCN 2006 78954 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 IEIIT-BO CNR University of Bologna Viale Risorgimento 2 Bologna 40136 Italy 2 WiLab 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 .
