Assigments2009

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Assigments2009

  1. 1. Sir Syed University of Engineering & Technology, Karachi Department of Computer Science Wireless Application Protocol Assignment#1 Last Date: 15 /03/12 ______________________________________________________________________________.Q#1 Compare and contrast a circuit-switched network and a packet-switched network.Q#2 Assume that a voice channel occupies a bandwidth of 4 kHz. We need to combine three voice channels into a link with a bandwidth of 12 kHz, from 20 to 32 kHz. Show the configuration, using the frequency domain. Assume there are no guard bands.Q#3 Five channels, each with a l00-kHz bandwidth, are to be multiplexed together. What is the minimum bandwidth of the link if there is a need for a guard band of 10kHz between the channels to prevent interference?Q#4 Discuss following four types of wireless networks, with examples. PAN, LAN, MAN, and WANQ#5 Define spread spectrum and its goal. Explain two spread spectrum techniquesQ#6 Assume that a voice channel occupies a bandwidth of 4 kHz. We need to multiplex 10 voice channels with guard bands of 500 Hz using FDM. Calculate the required bandwidth.Q#7 Describe two technical advantages and disadvantages of wireless systems that use bursty data transmission rather than continuous data transmission.Q#8 Describe three disadvantages of using a wireless LAN instead of a wired LAN. For what applications willthese disadvantages be outweighed by the benefits of wireless mobility. For what applications will the disadvantages override the advantages.

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