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EE 445S Real-Time Digital Signal Processing Lab Fall 2013

EE 445S Real-Time Digital Signal Processing Lab Fall 2013. Additional recitation slides for Lab 6 Quadrature Amplitude Modulation (QAM) Debarati Kundu. Additional Constellation diagrams. Quadrature Phase Shift-Keying (QPSK) Phase Shift Keying: 8-state Phase Shift-Keying (8-PSK)

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EE 445S Real-Time Digital Signal Processing Lab Fall 2013

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  1. EE 445S Real-Time Digital Signal Processing LabFall 2013 Additional recitation slides for Lab 6Quadrature Amplitude Modulation (QAM) Debarati Kundu

  2. Additional Constellation diagrams • Quadrature Phase Shift-Keying (QPSK) • Phase Shift Keying: • 8-state Phase Shift-Keying (8-PSK) • 16-state Phase Shift-Keying (16-PSK) • 32-state Phase Shift-Keying (32-PSK)

  3. QPSK • Constellation points: Subset of 16-QAM constellation. • Not a unique representation, but popular. • Constellation points lie in a circle. (“Constant envelope”). • Gray coding employed. • Bandwidth unchanged compared to BPSK. Constellation diagram for QPSK

  4. 8-PSK • Three bits per symbol. • Constellation points lie on a circle. • More data packed in at the same bandwidth, hence, more spectral efficiency. Constellation diagram for 8-PSK

  5. Even more spectral efficiency Constellation diagram for 16-PSK Constellation diagram for 32-PSK

  6. An engineering tradeoff • Higher constellation indicates higher data rate. • But the points to come closer to each other. • At the receiver, higher SNR required at the same error performance. • Tradeoff between spectral efficiency and signal quality.

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