Computer sciences and Information technology

Communication Systems

1. Explain the differences in terms of required bandwidth and transmission data rate between binary modulation schemes and multilevel (M-ary) modulation schemes. Comment on the error performance of each of these classes of modulation schemes and describe a specific application where these schemes can be used.
2. Discuss contention techniques used for Multiple Access giving a specific example of application of each of your contention techniques.
3. Describe the component parts of a satellite communication link employing a Geostationary satellite transmitting to satellite dish and associated receiver that is situated in any Northern European city of your choice. Then based on your outline system calculate a link budget (given that the receiver sensitivity is -80dBm and the link operates at 170 MHz) in order to determine the required transmitted power taking into account all relevant losses. Make and justify suitable assumptions for antenna gains.
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