JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.30, no.3, pp.371-380, 2015 (SCI-Expanded)
Wireless Personal Area Networks (WPANs) are computer networks used for data transmission among devices such as computers, telephones and industrial devices. These networks are operated in short ranges using low data rates and low-power radio signals. IEEE 802.15.4 protocol is a common standard used in these networks. Each packet is spitted into symbols including four data bits, and each of these symbols translated to thirty two bits Pseudo Noise(PN) chip sequences in physical layer of IEEE 802.15.4 protocol. In this paper, it is aimed to find the best data chip sequences to obtain maximum data transfer in a time unit for different wireless channel types for IEEE 802.15.4 protocol. To accomplish this, an adaptive data sequence generator mechanism is proposed. Performance analyses of IEEE 802.15.4 protocol with traditional and proposed PN sequences are made. The proposed method increased the packet transmission success by adjusting the lenght of chip sequences. These sequences considerably increase data throughput compared to standart IEEE 802.15.4 sequences. The success of the proposal is illustarated in tables and graphs showing comparative performance results.