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Partial Proposal: 11n Physical Layer

This partial proposal discusses the VISA-based MIMO processing, PLCP frame structure, and 2 and 4 Tx antenna MIMO in the 11n physical layer. It also explores the reuse of 11a coding and modulation blocks.

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Partial Proposal: 11n Physical Layer

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  1. Partial Proposal:11n Physical Layer Michiharu Nakamura and Wladimir Bocquet Fujitsu Laboratories Limited Fujitsu Laboratories Ltd.

  2. Summary • VISA based MIMO processing • PLCP frame structure • 2 and 4 Tx antenna MIMO • Keep .11a Coding and Modulation • Reuse .11a blocks (FFT, coding, Puncturing, Interleave) Fujitsu Laboratories Ltd.

  3. Supported modes • # of Rx antenna > # of Tx antenna Fujitsu Laboratories Ltd.

  4. Signal (a) (a) Power-Minimizing (b) • RLS or LMS with zero reference • Does not require • regeneration of the reference • nor synchronization Zero-Amplitude Subcarrier VISA Principle • Basic idea VISA: VIrtual Subcarrier Assignment Fujitsu Laboratories Ltd.

  5. Signal (a) FFT Signal (b) VISA Weight Calculation Weights to suppress signal (b) on this subcarrier w w w S Pre-FFT VISA • General principle The weights is not applicable to whole band Because the channel is frequency dependent (11-03/940r4) Fujitsu Laboratories Ltd.

  6. Signal (a) FFT FFT FFT Signal (b) VISA Weight Calculation w w w S Post-FFT VISA • General principle Perform Null Steering processing through all the subcarriers Fujitsu Laboratories Ltd.

  7. 2nd LP 2nd LP 2nd LP 1st SP 1st LP SIGNAL 2nd SP Ant 1 2nd SP 2nd LP 2nd LP 2nd LP Ant 2 Ant 3 2nd SP 2nd LP 2nd LP 2nd LP Ant 4 2nd SP 2nd LP 2nd LP 2nd LP Proposed Frame Format • 1st SP and 1st LP: Same as .11a SP and LP • SIGNAL : Same as .11a except for RATE field • 2nd SP and 2nd LP (ANT 1): Same as .11a • 2nd SP and 2nd LP (ANT 2,3,4) : Phase rotation of ANT1 Fujitsu Laboratories Ltd.

  8. RATE Field • IEEE 802.11a/g based modes Fujitsu Laboratories Ltd.

  9. RATE Field (cont’d) • MIMO-OFDM modes Fujitsu Laboratories Ltd.

  10. 2nd LP 2nd LP 2nd LP 1st SP 1st LP SIGNAL 2nd SP Ant 1 2nd SP 2nd LP 2nd LP 2nd LP Ant 2 Ant 3 2nd SP 2nd LP 2nd LP 2nd LP Ant 4 2nd SP 2nd LP 2nd LP 2nd LP Second Short Preamble (2nd SP) • Need to perform AGC for MIMO receiver • One example is given 11-04/087r0 • Codeword representation: 0 means the same polarity, 1 means the opposite polarity. Fujitsu Laboratories Ltd.

  11. 2nd LP 2nd LP 2nd LP 1st SP 1st LP SIGNAL 2nd SP Ant 1 2nd SP 2nd LP 2nd LP 2nd LP Ant 2 Ant 3 2nd SP 2nd LP 2nd LP 2nd LP Ant 4 2nd SP 2nd LP 2nd LP 2nd LP Second Long Preamble (2nd LP) • Antenna 1: same as .11a LP • Antenna 2: based on LP(Ant1) • Antenna 3: based on LP(Ant1) • Antenna 4: based on LP(Ant1) • Yet to find good LP configuration Fujitsu Laboratories Ltd.

  12. 11a coding block DATA ANT1 PSDU S/P DATA ANT2 11a coding block DATA ANT3 11a coding block Channel Coding and Interleaving • Keep as the Same as 11a/g coding block • SERVICE, TAIL, PAD • Scrambling, Conv. Code, Interleave • Per antenna processing / No spatial coding Fujitsu Laboratories Ltd.

  13. PMD function (Modulation) • Identical to that of .11a Fujitsu Laboratories Ltd.

  14. Simulation Setup Fujitsu Laboratories Ltd.

  15. Simulation Results Tx=2, Rx=4 with frequency domain visa processing Fujitsu Laboratories Ltd.

  16. MAC Layer Support • Supported Rates element • Extended Supported Rates element • Rates in 500kbps unit • Msb(bit7) to indicate BSSBasicRateSet • 63.5Mbps is the maximum specifiable in current .11a/g • No designation of Antenna modes To use pre-defined table for .11n use Fujitsu Laboratories Ltd.

  17. MAC Layer Support Example of the definition of the information octet of Supported Rates element Fujitsu Laboratories Ltd.

  18. Thank you! • For your attention. Fujitsu Laboratories Ltd.

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