A binary data stream needs to be transmitted at 5 Mbit/s by means of binary signaling. To minimize ISI, a duobinary puls

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A Binary Data Stream Needs To Be Transmitted At 5 Mbit S By Means Of Binary Signaling To Minimize Isi A Duobinary Puls 1 (490.52 KiB) Viewed 11 times

A binary data stream needs to be transmitted at 5 Mbit/s by means of binary signaling. To minimize ISI, a duobinary pulse will be used. The differential encoding duobinary signaling can be generated using the scheme shown in Figure 1. Precoder Pk ak bi y(0) Message bits 1 + Polar line code Σ Zero-ISI pulse generator + Delay T Delay T. Duobinary pulse generator Figure 1 Differential duobinary Encoder 5 5 4 4 a) Determine the minimum required bandwidth for this transmission. b) To make the data more random, a scrambler is inserted before the differential duobinary encoder. Figure 2a shows the scrambler structure. Consider a random binary sequence is S= 10110111100100000011, find the output of the scrambler T c) The output of scrambler is applied into the differential duobinary encoder, specify the differential encoder output sequence Pk, polar line code output ak, and the sampled duobinary transmission signal yk = (kTb). d) Assume there is no noise, the received signal is y(kTo) = bk. And the receiver decision is 2 – ly(kto | Ik 2 Calculate the receiver output sequence Ik . The output sequence is then applied to the descrambler of Figure 2b. Verify that the output of the descrambler is the correct sequence. 3 3 2. 2 1 1 S T T R Clock recovery (a) Scrambler (b) Descrambler Figure 2 Scrambler and Descrambler Diagram