EC2043 WIRELESS NETWORKS UNIT I PHYSICAL AND WIRELESS MAC LAYER ALTERNATIVES PART – A (2 Marks) 1. Name five design consideration in selecting a modulation scheme for a wireless networks. 2. Why is out of band of radiation an important issue in designing modulation scheme? 3. Why is PPM used with IR communication instead of PAM? 4. Name four space diversity techniques. 5. What are the advantages of high efficiency voice band modems
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infiltrations. However‚ much of the commonly used security precautions are woefully inadequate. They seem to detract the casual sniffer‚ but are unable to stop the powerful adversary. In this article‚ we look into the technology and the security schemes in IEEE 802.11‚ cellular and Bluetooth wireless transport protocols. We conclude that the only reliable security measure for such networks is one hat is based on application level security such as using a VPN. 1. Introduction The use of wireless communication
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point-to-point and point-to-multipoint remote wireless bridge‚ Ethernet to wireless bridge‚ and wireless gate. However‚ infrastructure is the most commonly used with an access point connected to a wired infrastructure. The second step is to select the IEEE wireless network type 802.11a/b/g/n depending on what type of applications will be used and what speeds are needed to the size of the area to be covered you could also use a AP that can combine two or more of the 802.11 types. The third step is to
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the operation‚ and the pros and cons of this device. I chose the Cisco Valet Plus Router Based on the specifications listed on the products exterior package. What caught my attention were the Data Link Protocol; Ethernet‚ Gigabit Ethernet‚ IEEE 802.11b‚ IEEE 802.11n‚ IEEE802.11g‚ Fast Ethernet‚ and the data transfer rate 300 Mbps. In today’s day and age it seems the speed and efficiency is very necessary and takes priority in our daily lives. The frequency band is 2.4 GHz. A feature that I have
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knowledge of the principal foundation of phenomena and observable facts. BIBLIOGRAPHY Online Resources Haidar‚ M. (November 2007). “Load Balancing and Channel Assignment in IEEE 802.11 Wireless Local Area Networks”. Retrieved last August 20‚ 2008 from http:// ualr.edu/mxhaidar/Dissertation/MH_dissertation_final.pdf IEEE. (June 2008). “802.11”. Article posted to http://www.ieee802.org/11. Mitchell‚ B. (©2008). “802.11”. Article posted to http://compnetworking.about. com/od/wireless80211/g/bldef_80211x
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Diversity‚ IEEE trans. Commun‚ Volume 37‚ no. 3‚ pp. 200-210. * Andrew Miceli (2003) Wireless technician ’s handbook‚ Artech House Publishers‚ pp.292. * A.P.Godse andU.A.Bakshi(2008) Basics of Electrical and Electronics Engineering Technical publishers‚ pp.822. * Banelli‚ P. (2003) Theoritical Analysis and Performance of OFDM Signals in Nonlinear Fading Channels‚ IEEE transactions on wireless communications‚ Vol. 2‚ Issue 2‚ pp. 284-293. * Blachman N. M. (1964) Bandpass nonlinearities‚ IEEE Trans
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Check Your Understanding 1. Fill in IEEE 802.11 B‚ 802.11 G‚ 802.11 A‚ or 802.11 and in the blank to match the description. 802.11b Specifies data rates of 1‚ 2‚ 5.5‚ in 11 Mbps do two different sized spreading sequences specified in the DSSS modulation technique. 802.11g Uses the 802.11 MAC‚ but with higher data rates in the 2.4 GHz ISN band by using the OFDM modulation technique. 802.11a Uses the 5.7 GHz band with less interference‚ but obstructions can affect performance and limit range
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and home equipment without wires will finally become a reality. In this paper we present a low cost‚ low power and high broadband chip‚ which will be vital in enabling the digital economy of the future. INTRODUCTION: Wi-Fi (ieee-802.11b) and WiMax (ieee-802.16e) have
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closet in the middle of the space. Which of the following is true about the distance limitations in this LAN? C. All Ethernet user devices can be up to 100 meters away (but no farther)‚ while WLAN devices must typically be closer than 100 meters. 2. IEEE 802.11 standards define a maximum speed for an individual transmission‚ with some variables that affect 802.11n speeds. Assuming that 802.11n uses the narrower 20-MHz channel and a single stream‚ which of the following answers matches a particular
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Chapter 1 1.What is the range of transmission for a WPAN? 10 feet 2.At what rate is the number of wireless hostpots increasing each year? 350% 3.Which of the following technologies came first chronologically? leased transmission lines 4.A Bluetooth network that contains one master and at least one slave device forms a ____. piconet 5.If an organization s data processing center becomes inoperable‚ it can move all data processing operations to a ____‚ often within an hour. Hot site 6____ give team-based
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