Analysis of DSSS – CDMA System for Varying Number of Users

Performance of Direct sequence spread spectrum code division multiple Access (DSSS – CDMA) under the presence of multiple users is addressed in this Engineering report.  A system model for DSSS – CDMA, Quasi-orthogonal spreading code is developed.  This Engineering report shows that as more access the system simultaneously, the noise level and hence the error rate increases, only gradual does the system degrade to the point of an unacceptable error rate increases, only gradual does the system degrade to the point of an unacceptable error rate.  This property makes it more desirable than frequency Division multiple Access and Time Division multiple Access in cellular network that most have a fixed number of users

A COMPARATIVE ANALYSIS OF 802.11b AND 802.11g NETWORK

Recent advances in wireless technology has led to the introduction of new devices utilizing the 2.4GHz industrial scientific and medical (ISM) unlicensed band traditionally used by Wireless LANS (WLAN). The increasing demand of higher data rate in WLANs has prompted the continual emergence of different 802.11 protocols with increased performance. Interoperability and coexistence between these networks become key issues and must be catered for, to guarantee satisfactory performance of both networks. 802.11 refer to a family of specifications developed by the International Institute of Electrical Electronics Engineering (IEEE) for wireless LAN technology. IEEE accepted the specification for 802.11 in 1997. Wireless Local Area Network (WLAN) has become popular in the home due to ease of installation, and the increasing popularity of laptop computers. WLAN is based on IEEE 802.11 standard and is also known as Wireless Fidelity (Wi-Fi) [1]. In this paper, the comparative analysis of IEEE 802.11b and IEEE 802.11g networks are x-rayed. KEYWORDS: 802.11b, 802.11g, WLAN, IEEE, OFDM, LRWPANS, Wireless Fidelity, Wireless Medium Access Control, Physical Layer