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hw2sol_2014 - EE 284 F Tobagi Autumn 2014-2015 EE284...

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EE 284 F. Tobagi Autumn 2014-2015 EE284 Homework Assignment No. 2 SOLUTIONS Total Points: 33 Problem 1: Encoding Techniques (10 points) 1. Nonreturn to Zero Level (NRZ-L): a) [0.5 points] The signal resulting from encoding the data sequence 011011100101 is shown in Figure 1 below. b) [0.5 points] The signal resulting from encoding the data sequence 10101010... is shown in Figure 2 below. The resulting ratio of the signalling rate to the data rate is 1. c) [0.5 points] Data sequence for minimum signalling rate is all 0’s or all 1’s For either of these sequences, the ratio of the signalling rate to the data rate = 0. d) [0.5 points] Data sequence for maximum signalling rate is 101010... For this sequence, the ratio of the signalling rate to the data rate = 1. 0 1 NRZ-L 1 1 0 1 0 1 0 1 1 0 Figure 1: NRZL Signal for Data Sequence 011011100101 (question a)) 0 1 NRZ-L 1 0 1 0 1 0 1 1 0 Figure 2: NRZL Signal for Data Sequence 10101010 . . . (question b)) 1
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2. Nonreturn to Zero, Invert on Ones (NRZI): 0 1 NRZ-I 1 1 0 1 0 1 0 1 1 0 Figure 3: NRZI Signal for Data Sequence 011011100101 (question a)) 0 1 NRZI 1 0 1 0 1 0 1 1 0 Figure 4: NRZI Signal for Data Sequence 10101010 . . . (question b))
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