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Doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 1 of 22 Frequency Domain Modulators for 802.11b Mark Webster Intersil Corporation.

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Presentation on theme: "Doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 1 of 22 Frequency Domain Modulators for 802.11b Mark Webster Intersil Corporation."— Presentation transcript:

1 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 1 of 22 Frequency Domain Modulators for 802.11b Mark Webster Intersil Corporation July 2000 This Microsoft Powerpoint presentation has notes attached. Please expand to Notes Page View mode.

2 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 2 of 22 Overview Examine frequency domain modulator for 802.11 1 and 2 Mbps Barker signaling. Examine frequency domain modulator for 5.5 and 11 Mbps CCK signaling. Examine frequency domain modulator for 5.5 and 11 Mbps PBCC signaling. Compare 802.11b frequency domain modulators to OFDM modulator. Cyclic extensions for Barker or CCK transmissions (non 802.11b variant). This Microsoft Powerpoint presentation has notes attached. Please expand to Notes Page View mode.

3 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 3 of 22 1 and 2 Mbps BARKER Mode: Time Domain Modulator 1 Mbps: BPSK 2 Mbps: QPSK time Time Domain Multiply Narrow Sinc Spectrum Wide Sinc Spectrum

4 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 4 of 22 +1 Barker Code Viewed in Discrete Domain 11 Chip BARKER Code DFT SPECTRUM

5 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 5 of 22 +1 Chip Pulse time Periodically Extended Barker Samples Periodically Extended Barker Chips convolution Barker Code Spreading Detail Pulse Shape Envelop

6 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 6 of 22 Barker Mode Signaling Revisited 1 Mbps: BPSK 2 Mbps: QPSK time Time Domain Multiply Equals Frequency Domain Convolution time Composite

7 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 7 of 22 Pulse Shape Envelop Constituent Stacked Carriers Spread Spectrum: Stacked Carriers Composite

8 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 8 of 22 phzFreqRespDeg 40.4941 -24.9605 -90.4150 57.6877 138.6759 0 -138.6759 -57.6877 90.4150 24.9605 -40.4941 ampFreqResp 1.0000 0.2887 1.0000 freqMHz -5 -4 -3 -2 0 1 2 3 4 5 Sub-Carrier Amplitude/Phase

9 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 9 of 22 11 pt. IFFT Compute Amp/Phz of each Subcarrier P/S Barker Spectrum BPSK/QPSK Rotation Info Bit(s) 1 and 2 Mbps BARKER Mode: Frequency Domain Modulator Constellation Mapper -5-4-3-2012345 Freq (MHz) A 1 e j 1 A 2 e j 2 A 3 e j 3 A 5 e j 5 A 4 e j 4 A 6 e j 6 A 11 e j 11 A 7 e j 7 A 8 e j 8 A 10 e j 10 A 9 e j 9 11 1

10 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 10 of 22 2 Mbps Subcarrier Constellations All Subcarriers carry QPSK at their respective phase tilt.

11 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 11 of 22 5.5 Mbps CCK Mode: Time Domain Modulator QPSK time Time Domain Multiply time 4 Spreading Codes

12 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 12 of 22 5.5 Mbps Codeword Subcarrier Spectrums

13 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 13 of 22 8 pt. IFFT Compute Amp/Phz of each Subcarrier P/S 4 Codeword Spectrums QPSK Rotation 2 Info Bits 5.5 Mbps CCK Mode: Frequency Domain Modulator Constellation Mapper 8 81 2 Info Bits A 1 e j 1 A 2 e j 2 A 3 e j 3 A 5 e j 5 A 4 e j 4 A 6 e j 6 A 7 e j 7 A 8 e j 8 1 2 3 4 5 6 7 8

14 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 14 of 22 5.5 Mbps Subcarrier Constellations 3 unique QAM constellations to within a phase tilt. QPSK8 QAM QPSK 5 QAM 8 QAM

15 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 15 of 22 11 Mbps CCK Mode: Time Domain Modulator QPSK time Time Domain Multiply time 64 Spreading Codes

16 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 16 of 22 8 pt. IFFT Compute Amp/Phz of each Subcarrier P/S 64 Codeword Spectrums QPSK Rotation 2 Info Bits 11 Mbps CCK Mode: Frequency Domain Modulator Constellation Mapper 8 81 6 Info Bits A 1 e j 1 A 2 e j 2 A 3 e j 3 A 5 e j 5 A 4 e j 4 A 6 e j 6 A 7 e j 7 A 8 e j 8 1 2 3 4 5 6 7 8

17 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 17 of 22 11 Mbps Subcarrier Constellations Sub-Carriers 1, 3, 5, 7 Sub-Carriers 2, 4, 6, 8 QAM Constellations 9 QAM24 QAM

18 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 18 of 22 8 pt. IFFT Compute Amp/Phz of each Subcarrier P/S 8 Info Bits 11 Mbps PBCC Mode: Frequency Domain Modulator Constellation Mapper Exists, but is Complicated 8 A 1 e j 1 A 2 e j 2 A 3 e j 3 A 5 e j 5 A 4 e j 4 A 6 e j 6 A 7 e j 7 A 8 e j 8 1 2 3 4 5 6 7 8

19 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 19 of 22 Scrambler Viterbi Encoder Interleaver Constellation Mapper IFFT Add Cyclic Extension 802.11A OFDM MODULATOR BLOCK DIAGRAM Data Sub-Carrier Constellations BPSK: 6, 9 Mbps QPSK: 12, 18 Mbps 16 QAM: 24, 36 Mbps 64 QAM: 48, 54 Mbps OFDM DIRECTLY EMBRACES FREQUENCY DOMAIN SIGNALING Used to Eliminate the Need for IBI Equalizer BPSK Pilot Subcarriers Cyclically Extends Sub-Carriers

20 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 20 of 22 16 Samples 64 Samples IFFT/FFT SPAN Cyclic Extend 4 usecs OFDM Symbol 312.5 KHz Tone Spacing 52 Subcarriers... frequency time 802.11a OFDM Symbol 20 MHz x 4 usecs = 80 samples ~16.25 MHz Equivalent to 64 Chip Codewords

21 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 21 of 22 Cyclic Extensions Can Be Used on Any Codeword Original Codeword Cyclically- Extended Codeword 1 2 3 4 5 6 7 8 9 10 11 10 11 1 2 3 4 5 6 7 8 9 10 11 Smoothly Extends Sub-Carriers in Time

22 doc.: IEEE 802.11-00/202r1 Submission July 2000 Mark Webster, IntersilSlide 22 of 22 Summary 1 and 2 DSSS Barker code modulation is actually OFDM with 11 sub-carriers. Each sub-carrier uses phase-tilted QPSK. All sub-carriers are equal amplitude, but the center. 802.11b 5.5 Mbps CCK is actually OFDM with 8 sub- carriers. Two sub-carriers carry QPSK. Two sub-carriers carry 5 QAM. Four sub-carriers carry 8 QAM. 802.11b 11 Mbps CCK is actually OFDM with 8 sub- carriers. Four sub-carriers carry 9 QAM. Four sub-carriers carry 24 QAM. Cyclic extensions can be added to all these signals to eliminate the need for inter-block interference (IBI) equalization.

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