8 a) The sequence o{k} =0010} is to be transmitted by binary digital modulation. Sketch the waveforms and I/Q-diagrams f

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8 A The Sequence O K 0010 Is To Be Transmitted By Binary Digital Modulation Sketch The Waveforms And I Q Diagrams F 1 (824.75 KiB) Viewed 44 times

8 a) The sequence o{k} =0010} is to be transmitted by binary digital modulation. Sketch the waveforms and I/Q-diagrams for on-off keying and phase shift keying. [6 marks] b) Consider the following signal X(t) X(t) = e-fu(t) – 2e-2'u(t) where u(t) denotes the unit-step function. Derive the spectrum density of this signal. Hint: for a signal (t) with a>0, its Fourier transform is ergy jo+a [4 marks] C) c) Differential Manchester code has been used in the IEEE 802.5 standard for token ring LANs. Sketch the Manchester code and the differential Manchester code for the bit stream 1010111. [4 marks] d) Explain what you understand by code division multiple access (CDMA), time division multiple access (TDMA) and frequency division multiple access (FDMA) in communications, [6 marks]