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Need some Clarification to some Questions (data communication)

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hibiskusi

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Hi folks,
I hope you are doing well.
I have some questions which i need some clarification, so i would appreciate if you could help me. I really need them in urgency.
I am preparing a certification on Data Communication, but the following questions, have different opinion answers and this is the reason why i am asking for your help.

Bipolar line code
The advantage of a bipolar line code is that a bipolar fault (two successive positive or negative pulses, separated by any number of zeros) signals a transmission error to the receiver. Unfortunately, the receiver does not know where this error happened.
The receiver had received the defective sequence. Construct two scenarios (each with a wrongly transmitted signal) that produce the same sequence.

Monitoring security of multiplexing
Accept an unencrypted radio transmission. Which of the three multiplexing methods (time, frequency and / or code multiplexing) offers the highest monitoring security (0.75P)? Why (0.75P)?

Conduct an expression for the baud rate D as a function of a bit rate R for 16QAM using Manchester encoding! Use the maximum number of possible signal changes in Manchester.
 

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