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Khurram Masood 200806100

Khurram Masood 200806100. PSK-Based Digital Transmission Systems Chapter 3 of Hiroshi Harada Book. Outlines. BPSK transmission scheme Some instantaneous waveforms BER performance Other PSK transmission schemes QPSK OQPSK MSK GMSK QAM for transmission 16-QAM. BPSK Transmission Scheme.

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Khurram Masood 200806100

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  1. KhurramMasood200806100 PSK-Based Digital Transmission Systems Chapter 3 of Hiroshi Harada Book

  2. Outlines • BPSK transmission scheme • Some instantaneous waveforms • BER performance • Other PSK transmission schemes • QPSK • OQPSK • MSK • GMSK • QAM for transmission • 16-QAM

  3. BPSK Transmission Scheme

  4. Simulated instantaneous waveforms

  5. Theoretical and simulated BER performance

  6. QPSK transmission • BPSK is simple in configuration • QPSK signal is generated by 2 BPSK signals • QPSK has higher frequency utilization efficiency

  7. Simulated instantaneous QPSK waveforms

  8. Theoretical and simulated QPSK BER performance

  9. OQPSK transmission • QPSK transmission may result in a phase change of 180⁰ between two symbols, causing the spectrum to spread • OQPSK avoid origin crossings in the phase • Q-channel is half a symbol delayed from that of I-channel signal

  10. Simulated instantaneous OQPSK waveforms

  11. Theoretical and simulated OQPSK BER performance

  12. MSK transmission • Although OQPSK is good in reducing the big phase changes, the amplitude fluctuates • MSK is used to stabilize the amplitude

  13. Simulated instantaneous MSK waveforms

  14. Theoretical and simulated MSK BER performance

  15. GMSK transmission • In MSK maximum phase transition is limited to pi/2 in phase transition • Fluctuation is not smooth • Used for GSM mobile phone system • Expanded version of MSK • Amplitude is constant like in MSK • Phase transition is smooth as well

  16. Simulated instantaneous GMSK waveforms

  17. Theoretical and simulated GMSK BER performance

  18. QAM transmission • Increased transmission rate with high frequency utilization efficiency

  19. Simulated instantaneous 16QAM waveforms

  20. Theoretical and simulated 16QAM BER performance

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