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Abdul-Aziz .M Al- Yami Khurram Masood

Abdul-Aziz .M Al- Yami Khurram Masood. Case Study: Phase III Transmitter Receiver Simulation. Physical Layer (PHY). The standard specifies the following four PHYs: An 868/915 MHz direct sequence spread spectrum (DSSS) PHY employing binary phase-shift keying (BPSK) modulation

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Abdul-Aziz .M Al- Yami Khurram Masood

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  1. Abdul-Aziz .M Al-YamiKhurramMasood Case Study: Phase III Transmitter Receiver Simulation

  2. Physical Layer (PHY) • The standard specifies the following four PHYs: • An 868/915 MHz direct sequence spread spectrum (DSSS) PHY employing binary phase-shift keying (BPSK) modulation • An 868/915 MHz DSSS PHY employing offset quadrature phase-shift keying (O-QPSK) modulation • An 868/915 MHz parallel sequence spread spectrum (PSSS) PHY employing BPSK and amplitude shift keying (ASK) modulation • A 2450 MHz DSSS PHY employing O-QPSK modulation

  3. Frequency bands and data rates

  4. Frequency bands and data rates

  5. PHY – 2.4 GHz Mode • Each symbol (i.e. 4 bits) is represented by one of 16 32-chip sequences • First 8 sequences are cyclic shifts of one 32-chip sequence, last 8 are cyclic shifts of another sequence (see next slide)

  6. PHY – 2.4 GHz Mode … …

  7. PHY – 2.4 GHz Mode • Chip modulation is offset-QPSK, in which the Q-branch signal is delayed by one chip period (Tc) with respect to the I-branch signal • Pulse shape is half-sine with period 2Tc

  8. PHY – 2.4 GHz Mode Offset-QPSK with half-sine pulse shaping

  9. PHY – 868/915 MHz Mode • Raw bits are differentially encoded • XOR between current bit and the previous encoded bit • Each coded bit mapped to a 15-chip PN sequence • Zero to 1 1 1 1 0 1 0 1 1 0 0 1 0 0 0 • One to 0 0 0 0 1 0 1 0 0 1 1 0 1 1 1 (zero’s complement) • BPSK modulation with raised cosine pulse shaping with roll-off = 1.0 (100 % excess bandwidth)

  10. 2450 MHz DSSS PHY with O-QPSK • A 2450 MHz DSSS PHY employing O-QPSK modulation provides • 250 kbps data rate

  11. BER vs SNR

  12. 869/915 MHz DSSS PHY with BPSK • 868/915 MHz BPSK PHY, provides • 20 kb/s in the 868 MHz band and • 40 kb/s in the 915 MHz band

  13. BER vs SNR

  14. Semi-analytic Simulation (No ISI) Delay Estimation

  15. Semi-analytic Simulation (No ISI) Eye diagram

  16. Semi-analytic Simulation (No ISI) Noise estimation

  17. Semi-analytic Simulation (No ISI) BER vs SNR

  18. Semi-analytic Simulation (with ISI) Delay Estimation

  19. Semi-analytic Simulation (with ISI) Eye diagram

  20. Semi-analytic Simulation (with ISI) Noise estimation

  21. Semi-analytic Simulation (with ISI) BER vs SNR

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