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Preamble for HIPERLAN -2

Preamble for HIPERLAN -2. Jamshid Khun-Jush, Ericsson Coordinator of HIPERLAN type 2 & Chair of Physical Layer Technical Specification Group. dynamic boundary. Random access channel. Broadcast CHannel. Frame control CHannel. User data. uplink. downlink.

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Preamble for HIPERLAN -2

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  1. Preamble for HIPERLAN-2 Jamshid Khun-Jush, Ericsson Coordinator of HIPERLAN type 2 & Chair of Physical Layer Technical Specification Group Jamshid Khun-Jush, Ericsson

  2. dynamic boundary Random access channel Broadcast CHannel Frame control CHannel User data uplink downlink dynamic boundary Preamble PDU user burst consisting of n PDUs user data PDU: Protocol Data Unit (54 bytes) HIPERLAN-2/MMAC-WATM MAC Frame Jamshid Khun-Jush, Ericsson

  3. RA16 A16 RA16 IA16 B16 B16 B16 B16 IB16 C A16 C32 C64 C64 Downlink Preamble • BCH Preamble • Other Downlink Channels Preamble (FCH,SCH,LCH) Jamshid Khun-Jush, Ericsson

  4. Symbol Contents • A16/RA16 Symbol • The sign reversal of every second A16 symbol is automatically achieved by the specified subcarrier loading. • B16 Symbol (subcarrier loading as S-26…26 symbol in PLCP) • C64 Symbol: the same content as T1/T2 in 802.11a PLCP Jamshid Khun-Jush, Ericsson

  5. Detection-Failure and False-Alarm Rates-1 • Auto-Correlation (AC) Receiver Structure • Correlation delay Dac = 16 • Moving Average (MAV) window size of AC = 48 Jamshid Khun-Jush, Ericsson

  6. Detection-Failure and False-Alarm Rates-2 • Detector-1 only takes the absolute value of the A-field correlation peak (as well as the phase at the peak position to verify the peak belonging to the BCH A-field) and compares it with a defined threshold • Detector-2 takes into account both peaks (A-field and B-field) being above a certain threshold. Jamshid Khun-Jush, Ericsson

  7. Symbol PAPR and Dynamic Range Current 802.11a symbol S-26...26, PAPR = 3.00 dB B16-26...26 symbol, PAPR = 2.24 dB Jamshid Khun-Jush, Ericsson

  8. B16 B16 B16 IB16 B16 B16 B16 C C32 C64 C64 B16 B16 B16 B16 B16 B16 B16 IB16 Uplink Preamble • Short Preamble • Long Preamble (very similar to 802.11a PLCP preamble) Jamshid Khun-Jush, Ericsson

  9. Sign Inversion of the Last Repetition • Beneficial for • improving timing detection accuracy (sharper auto-correlation peak) • increasing the receiver implementation flexibility (e.g. auto-correlation based or cross-correlation based) • providing unique identification possibilities of the last short symbol repetition Jamshid Khun-Jush, Ericsson

  10. improving timing detection accuracy • Sharper auto-correlation peak Jamshid Khun-Jush, Ericsson

  11. Auto-Correlation Peak Jamshid Khun-Jush, Ericsson

  12. Detection Accuracy Jamshid Khun-Jush, Ericsson

  13. Cross-Correlation Receiver Jamshid Khun-Jush, Ericsson

  14. Cross-Correlation for A16 Jamshid Khun-Jush, Ericsson

  15. Cross-Correlation for A16 Jamshid Khun-Jush, Ericsson

  16. Spectrum Issues - 1 • Power Spectral Density: left (inverted), right (non-inverted) Jamshid Khun-Jush, Ericsson

  17. Spectrum Issues - 2 • TX signal filtering (FIR filter): only preamble • 8 MHz cut-off frequency, -60 dB stop-bandattenuation Jamshid Khun-Jush, Ericsson

  18. Spectrum Issues - 3 • TX signal filtering (only preamble) Jamshid Khun-Jush, Ericsson

  19. Spectrum Issues - 4 • TX signal filtering: data and preamble Jamshid Khun-Jush, Ericsson

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