5. (a) Describe how coherent detection affects the signal to noise ratio in Amplitude Modulation (AM)...
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5. (a) Describe how coherent detection affects the signal to noise ratio in Amplitude Modulation (AM) demodulation. [8 marks] (b) A digital stream 1000110110 is to be modulated using the Quadrature Phase Shift Keying (QPSK) modulation scheme. Sketch the in-phase and quadrature amplitudes for the digital stream against time. [6 marks] (c) Sketch the constellation diagram of the Offset QPSK (OQPSK) scheme and explain how it differs from QPSK modulation. [5 marks] (d) Figure Q5(d) shows a waterfall graph for a variety of digital modulation schemes. A wireless communication system is required that uses a modulation scheme with a minimum Bit Error Rate (BER) of 1e-5. With reference to bandwidth efficiency, power efficiency and resistance to noise, compare the performance of the QPSK and 32-PSK schemes in figure Q5(d) if they were used in the required communication system. [6 marks] Synbol Error Probability, Ps 1 0,1 0,01 0.001 1e-04 1e-85 1e-06 0 Symbol Error rate for various nodulation schenes 5 10 15 20 Es/No, dB Figure Q5(d) 25 BPSK 4PAM QPSK 16QAM 16PSK 64QAM 32PSK 30 35 5. (a) Describe how coherent detection affects the signal to noise ratio in Amplitude Modulation (AM) demodulation. [8 marks] (b) A digital stream 1000110110 is to be modulated using the Quadrature Phase Shift Keying (QPSK) modulation scheme. Sketch the in-phase and quadrature amplitudes for the digital stream against time. [6 marks] (c) Sketch the constellation diagram of the Offset QPSK (OQPSK) scheme and explain how it differs from QPSK modulation. [5 marks] (d) Figure Q5(d) shows a waterfall graph for a variety of digital modulation schemes. A wireless communication system is required that uses a modulation scheme with a minimum Bit Error Rate (BER) of 1e-5. With reference to bandwidth efficiency, power efficiency and resistance to noise, compare the performance of the QPSK and 32-PSK schemes in figure Q5(d) if they were used in the required communication system. [6 marks] Synbol Error Probability, Ps 1 0,1 0,01 0.001 1e-04 1e-85 1e-06 0 Symbol Error rate for various nodulation schenes 5 10 15 20 Es/No, dB Figure Q5(d) 25 BPSK 4PAM QPSK 16QAM 16PSK 64QAM 32PSK 30 35
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When we consider the much more realistic situation when we have a channel that introduces attenuation and noise we can make use of the justdescribed receivers linear nature to directly derive the rece... View the full answer
Related Book For
Probability and Random Processes With Applications to Signal Processing and Communications
ISBN: 978-0123869814
2nd edition
Authors: Scott Miller, Donald Childers
Posted Date:
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