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: Research Article Coexistence Mechanism for Colocated HDR/LDR WPANs Air Interfaces | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 473534 11 pages doi 2010 473534 Research Article Coexistence Mechanism for Colocated HDR LDR WPANs Air Interfaces Marco Monti 1 Mauro De Sanctis 1 Ernestina Cianca 1 Marina Ruggieri 1 and Ramjee Prasad2 1 Department of Electronic Engineering University of Rome Tor Vergata Rome Italy 2 Center for TeleInfrastruktur Aalborg University Aalborg Denmark Correspondence should be addressed to Marco Monti Received 2 December 2009 Revised 5 August 2010 Accepted 22 September 2010 Academic Editor Geert Leus Copyright 2010 Marco Monti 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. This paper addresses the issues of interference management among Low Data Rate LDR and High Data Rate HDR WPAN air interfaces that are located in close-proximity up to 10 cm and eventually on the same multimode device. After showing the noticeable performance degradation in terms of Bit Error Rate BER and goodput due to the out-of-band interference of an HDR air interface over an LDR air interface the paper presents a novel coexistence mechanism named Alternating Wireless Activity AWA which is shown to greatly improve the performance in terms of goodput of the most interference vulnerable air interface . the LDR air interface . The main difference of the proposed mechanism with respect to other collaborative mechanisms based on time-scheduling is that it synchronizes the transmission of the LDR and HDR WPANs at the superframe level instead of packet level. Advantages and limitations of this choice are presented in the paper. Furthermore the functionalities of the AWA mechanism are positioned in a common protocol layer over the Medium Access Control MAC sublayers of the HDR and LDR devices
