(a) Consider a communications system required to transmit binary data at a rate of 100 M bits s¹. A single AC-coupled tr

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A Consider A Communications System Required To Transmit Binary Data At A Rate Of 100 M Bits S A Single Ac Coupled Tr 1 (173.48 KiB) Viewed 30 times

(a) Consider a communications system required to transmit binary data at a rate of 100 M bits s¹. A single AC-coupled transmission line is available which must be used for both the data and used to derive a clock signal to recover the data. (i) Suggest a suitable line code that meets the requirements, explaining why you have selected it and how the clock can be recovered. (ii) For your line code from (i), sketch the transmitted waveform in the time domain waveform for the binary sequence 1 0 1 1 1 1 0 0 1 0 0. (iii) Sketch the power spectral density of your chosen line code and describe its key features. (b) Why is non-linear quantization often used in the digital transmission of speech? Briefly explain how "A-law" companding can be used to encode speech quality audio using 8-bit pulse code modulation (PCM). (c) A baseband 4-level polar rectangular pulse signal is used to transmit data. The total voltage deviation of the output ranges from +0.2 V to -0.2 V. (i) Assuming the receiver presents a load of 100 , what are the peak and average transmitted powers? State any assumptions you make. (ii) If the maximum permissible probability of a symbol error P₂ = 4 x 10-5s, what is the maximum allowable RMS noise voltage? (iii) If binary (2-level) polar is used with the same voltage deviation and the noise voltage found in (ii), what would the bit error probability be? (iv) What are the advantages of using 4-level polar signaling over 2-level signaling?