Performance analysis of multi-band OFDM UWB communications based on IEEE 802.15.3a system model

Abstract

In this paper, Multi-Band (MB) OFDM system for Ultra -wideband communication is analysed. Among the many Channel models described in the literature, S-V model is considered for propagation of the MB-OFDM system. The authors have found that complete analysis of the system was not done in the literature. Different code rates were considered as per the implementation of practical systems and the performance was studied with two modulation schemes, QPSK and 4-QAM.Index Terms-Ultra wide band (UWB), WPAN, IEEE 802.15.3a, Channel Model, and OFDM. I. INTRODUCTIONThe UWB system can be defined as a wireless application technology for achieving high transfer rate, low power consumption; low cost, wireless link for short range, low complexity , good order of location and tracking applications and co-existence with the existing narrowband technologies with minimum interference. The UWB works at frequency of 3.1 GHz to 10.6 GHz, an unlicensed spectrum, given by FCC in February 2002. This has led to new standards as IEEE802.15.3a developing high speed short range communication system for personal area network.Another exciting feature of UWB is that this technology allows data rates that can range from a data rate of 55 Mbps at a distance of 10m up to rate of 480 Mbps at a distance of 2m realistic multi-path environments, consuming very less power.The classical UWB systems had the main disadvantage of very wide bandwidth [1] which enhances the problem of building analog and RF circuits with large bandwidth, high speed ADCs for processing the signal and complex circuitry to deal the multi-path energy in multipath path environments. This problem was overcome by pulsed multi-band [2] approach which divides the spectrum into smaller sub bands more than 500 MHz or comparative excess 0.2. Single carrier Hashibul Alam is M-tech student in