transmit the letters “ERAU” using the ASCII representation of the letters.
HW # 6 1. I wish to transmit the letters “ERAU” using the ASCII representation of the letters. a. What is the bit level representation of “ERAU” b. Apply 4B5B encoding to the message. What is the encoded message in bits. c. The message will be preceded by at least 20 bits of random data. Generate at least 20 bits of random data and show it here. d. Make a single file that starts with the random data, adds the training pattern of “101010101” which is not 4B/5B encoded, and then the 4B/5B encoded message. Print the contents of the file here. (It should be human readable. i.e. a 1 displays as 1 and a 0 as 0.) e. Save the file as “cdr_data_out.dat”. f. This colab file is designed to find the training sequence, decode the data and print out the received text. Upload your file and verify your encoding was correct. Show the program output. https://colab.research.google.com/drive/1YVgRg-0_JCaczQOPF_eq4FAsayS365K?usp=sharing g. What would happen if the random data contained the training sequence? If this is a problem, how can it be prevented? 2. A Python program that simulates a phase-locked-loop is below. You can run this program on your local machine if you have Python or you can create a colab notebook to run the file. https://drive.google.com/file/d/1fNkPZMuc3qFZV5x76VZqqHmvGAus4rT/view?usp=sharing a. Set the file to use the XOR detector and set the f_input = 25 and the vco_freq=25. The simulation will start with a 90 degree phase error. Copy the plot here and comment on what the XOR detector output plot means in terms of the phase error. b. Change the vco_freq to 25.1. Copy the plot here and comment on the detectors’ ability to achieve phase lock. c. Change the detector to the phase-frequency-detector (PFD). Keep vco_freq=25.1 Copy the plot here and comment on the detectors speed in achieving phase lock. d. Change the vco_freq to 30. Copy the plot here and comment on the detectors’ speed in achieving phase lock.
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