Partial Proposal: 11n Physical Layer

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Presentation transcript:

Partial Proposal: 11n Physical Layer August 2004Month 2003 Partial Proposal: 11n Physical Layer Michiharu Nakamura and Wladimir Bocquet Fujitsu Laboratories Limited Fujitsu Laboratories Ltd.

Summary VISA based MIMO processing PLCP frame structure August 2004Month 2003 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.

Supported modes # of Rx antenna > # of Tx antenna Bit Rate (Mbps) August 2004Month 2003 Supported modes Bit Rate (Mbps) Modulation Coding Rate # of Tx antenna 72 16QAM 3/4 2 QPSK 4 96 64QAM 2/3 1/2 108 144 192 216 # of Rx antenna > # of Tx antenna Fujitsu Laboratories Ltd.

VISA Principle Basic idea VISA: VIrtual Subcarrier Assignment August 2004Month 2003 VISA Principle Basic idea (a) (b) Power-Minimizing Signal (a) Zero-Amplitude Subcarrier RLS or LMS with zero reference Does not require regeneration of the reference nor synchronization VISA: VIrtual Subcarrier Assignment Fujitsu Laboratories Ltd.

Pre-FFT VISA General principle August 2004Month 2003 Pre-FFT VISA General principle VISA Weight Calculation w S FFT Signal (a) Signal (b) Weights to suppress signal (b) on this subcarrier The weights is not applicable to whole band Because the channel is frequency dependent (11-03/940r4) Fujitsu Laboratories Ltd.

Post-FFT VISA General principle August 2004Month 2003 Post-FFT VISA General principle VISA Weight Calculation w S FFT Signal (a) Signal (b) Perform Null Steering processing through all the subcarriers Fujitsu Laboratories Ltd.

Proposed Frame Format 1st SP and 1st LP: Same as .11a SP and LP August 2004Month 2003 Proposed Frame Format SIGNAL Ant 1 Ant 2 Ant 3 Ant 4 1st LP 2nd SP 2nd LP 1st SP 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.

RATE Field IEEE 802.11a/g based modes Data Rate (Mbps) Modulation August 2004Month 2003 RATE Field IEEE 802.11a/g based modes Data Rate (Mbps) Modulation Coding Rate # of Tx (R1,R2,R3,R4) 6 BPSK 1/2 1 1101 9 3/4 1111 12 QPSK 0101 18 0111 24 16-QAM 1001 36 1011 48 64-QAM 2/3 0001 54 0011 Fujitsu Laboratories Ltd.

RATE Field (cont’d) MIMO-OFDM modes Data Rate (Mbps) Modulation August 2004Month 2003 RATE Field (cont’d) MIMO-OFDM modes Data Rate (Mbps) Modulation Coding Rate # of Tx (R1,R2,R3,R4) 72 16-QAM 3/4 2 0110 QPSK 4 1110 96 64-QAM 2/3 0100 1/2 1100 108 1010 144 1000 192 0010 216 0000 Fujitsu Laboratories Ltd.

Second Short Preamble (2nd SP) August 2004Month 2003 Second Short Preamble (2nd SP) SIGNAL Ant 1 Ant 2 Ant 3 Ant 4 1st LP 2nd SP 2nd LP 1st 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.

Second Long Preamble (2nd LP) August 2004Month 2003 Second Long Preamble (2nd LP) SIGNAL Ant 1 Ant 2 Ant 3 Ant 4 1st LP 2nd SP 2nd LP 1st SP 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.

Channel Coding and Interleaving August 2004Month 2003 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 PSDU S/P 11a coding block DATA ANT1 ANT2 ANT3 Fujitsu Laboratories Ltd.

PMD function (Modulation) August 2004Month 2003 PMD function (Modulation) Identical to that of .11a Fujitsu Laboratories Ltd.

Simulation Setup Carrier Frequency 2.4 GHz Bandwidth 20 MHz Modulation August 2004Month 2003 Simulation Setup Carrier Frequency 2.4 GHz Bandwidth 20 MHz Modulation BPSK, QPSK, 16-QAM, 64-QAM Channel encoder Convolutional code Coding rate R=1/2 (K=7) and R=3/4 (puncturing) Number of data subcarrier N=48+4 Guard interval length G=16 samples (32 for pilot symbols) Channel model B Channel knowledge Estimated Terminal speed 1 m/s Sample period Ts=0.05μs (Nt,Nr) (2,4) Antenna spacing Transmitter: λ , Receiver: λ/2 Fujitsu Laboratories Ltd.

Simulation Results Tx=2, Rx=4 with frequency domain visa processing August 2004Month 2003 Simulation Results Tx=2, Rx=4 with frequency domain visa processing Fujitsu Laboratories Ltd.

MAC Layer Support Supported Rates element August 2004Month 2003 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.

August 2004Month 2003 MAC Layer Support Example of the definition of the information octet of Supported Rates element Rate (Mbps) Code Transmit Antenna Mode 1 2 18 36 72 110 4 22 44 111 5.5 11 24 48 96 112 6 12 33 66 113 9 108 114 144 115 54 192 116 216 117 Fujitsu Laboratories Ltd.

Thank you! For your attention. August 2004Month 2003 Fujitsu Laboratories Ltd.