1 / 19

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.

russellethomas
Download Presentation

Preamble for HIPERLAN -2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related