O Samoa Mo Samoa

1895 Words8 Pages
Chapter 1 Overview of Wireless Communication Systems Problems: 1. As storage capability increases, we can store larger and larger amounts of data on smaller and smaller storage devices. Indeed, we can envision microscopic computer chips storing terraflops of data. Suppose this data is to be transfered over some distance. Discuss the pros and cons of putting a large number of these storage devices in a truck and driving them to their destination rather than sending the data electronically. 2. Describe two technical advantages and disadvantages of wireless systems that use bursty data transmission rather than continuous data transmission. 3. Find the round-trip delay of data sent between a satellite and the earth for LEO, MEO, and GEO satellites assuming the speed of light is 3 × 108 m/s. If the maximum acceptable delay for a voice system is 30 milliseconds, which of these satellite systems would be acceptable for two-way voice communication? 4. Figure 1.1 indicates a relatively flat growth for wireless data between 1995 and 2000. What applications might significantly increase the growth rate of wireless data users. 5. This problem illustrates some of the economic issues facing service providers as they migrate away from voice-only systems to mixed-media systems. Suppose you are a service provider with 120KHz of bandwidth which you must allocate between voice and data users. The voice users require 20Khz of bandwidth, and the data users require 60KHz of bandwidth. So, for example, you could allocate all of your bandwidth to voice users, resulting in 6 voice channels, or you could divide the bandwidth to have one data channel and three voice channels, etc. Suppose further that this is a time-division system, with timeslots of duration T. All voice and data call requests come in at the beginning of a timeslot and both types of calls last T seconds.

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