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QPSK Receiver

QPSK Receiver. QPSK Receiver. Integrate & Dump MF. 2 stufiger Prozess. Phasor diagram. We can represent the BPSK signal using a phasor diagram which shows the two possible BPSK states. This is referred to as a signal constellation. 90 ˚. 180 ˚ = binary 0. 0 ˚ = binary 1. 180 ˚. 0 ˚.

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QPSK Receiver

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  1. QPSK Receiver

  2. QPSK Receiver Integrate & Dump MF 2 stufiger Prozess

  3. Phasor diagram • We can represent the BPSK signal using a phasor diagram which shows the two possible BPSK states. • This is referred to as a signal constellation. 90˚ 180˚ = binary 0 0˚ = binary 1 180˚ 0˚ 270˚

  4. 90˚ 180˚ 0˚ 270˚ 90˚ 180˚ 0˚ 270˚ Noise effects - BPSK 20 dB SNR 10 dB SNR 90˚ 180˚ 0˚ 270˚ 2 dB SNR

  5. QPSK Receiver

  6. 0˚ = binary 000 45˚ = binary 001 90˚ 90˚ = binary 011 135˚ = binary 010 180˚ = binary 110 180˚ 0˚ 225˚ = binary 111 270˚ = binary 101 315˚ = binary 100 270˚ M-ary PSK • In order to increase the data rate without increasing bandwidth, we can further increase the number of bits per symbol. • In the 8-PSK constellation below, 8 possible phase shifts allow 3 bits to be transmitted by each symbol.

  7. 90˚ 10 dB SNR 180˚ 0˚ 270˚ Noise effects (8-PSK) • What is the relative likelihood of an error?

  8. Lowpass Filter Squaring Device Frequency Divider Bandpass Filter Limiter (or PLL) Squaring loop • Recover frequency using squaring

  9. Costas Loop 180 Grad Unsicherheit engl. „Phase Ambiguity“ Bekannte Präambel notwendig

  10. Baseband LPF VCO LPF -90 Phase shift Baseband LPF Costas loop • Goal of Costas loop: e0

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