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Doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 1 Reuse of 802.11b Preambles with HRb OFDM Mark Webster.

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Presentation on theme: "Doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 1 Reuse of 802.11b Preambles with HRb OFDM Mark Webster."— Presentation transcript:

1 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 1 Reuse of 802.11b Preambles with HRb OFDM Mark Webster and Steve Halford Intersil Corporation

2 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 2 802.11b Backward Compatibility Requirement Must maintain all 802.11b signaling timelines. Must reuse long preamble. Can reuse short preamble option. Must maintain SIFS, PIFS, DIFS, EIFS Must maintain slot times. Must maintain CCA reaction times. Minimal MAC impact. INTERSIL’s HRb PHY proposal meets all these requirements.

3 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 3 INTERSIL’s HRb OFDM Meets the 802.11b 10 usec SIFS time

4 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 4 Compatibility with 802.11b SIFS Using Existing Short/Long Preambles Common Problem for HRb Proposals 802.11b SIFS Time of 10 usecs may be a bit too short

5 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 5 Compatibility with 802.11b SIFS Using Existing Short/Long Preambles 10 usecs SIFS 16 usecs SIFS 802.11b 802.11a OFDM Data ACK Extra 6 usecs required for FFT De-interleave Decoder flush EXAMPLE: 802.11b SIFS time of 10 usecs is too short for the more sophisticated 802.11a which has a 16 usecs SIFS. Why?

6 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 6 Compatibility with 802.11b SIFS Using Existing Short/Long Preambles 802.11 DSSS SIFS 10 usecs 802.11b SIFS 10 usecs 802.11 HRb SIFS 10 usecs Inherit Complexity/ Latency Note: Can trade latency for increased design complexity and higher speed clocks. Receiver Sophistication

7 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 7 Compatibility with 802.11b SIFS Advanced Codeword Transforms Extended CCK Advanced Gold codes Equalizers FFT/FEQ Viterbi Equalizer Linear equalizer DFE De-interleaver Combat impulse noise FEC Viterbi (flush) Reed Solomon Matched Filters Channel matched filter Whitened matched filter 802.11 DSSS SIFS 10 usecs 802.11b SIFS 10 usecs 802.11 HRb SIFS 10 usecs Inherit HRb Proposals Have More Advanced Demodulators

8 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 8 Compatibility with 802.11b SIFS aSIFSTime = aRxRFDelay + aRxPLCPDelay + aMACPrcDelay + aRxTxTurnaroundTime SIFS TIME BUDGET Rx PLCP Delay Impacted by FEC Decoder Deinterleaver Equalizers Codeword transforms Reading/Writing Data Buffers

9 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 9 Achieving Compatibility with 802.11b SIFS with Signal Extension 802.11 HRb Signal HRb Data ACK 10 usecs SIFS Signal Extension Maintain 802.11b air interface Create flush-processing margin via packet signal extension. Extend to integer # of usecs consistent with length field in Barker preamble header Maintains CCA energy Proposed Common Solution Length usecs Read Length usecs Start Receiver Flush Processing BARKER SYNC BARKER HEADER

10 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 10 Compatibility with 802.11b SIFS. Pattern HRb after 802.11a’s Behavior. 802.11a OFDM Uses Last-Symbol Data Extension. Propose doing something similar for HRb. Symbol Last Symbol 4 usecs 802.11a Rate Mbps Bytes/Symbol 6 3 9 4.5 12 6 18 9 24 12 36 18 48 24 54 27 802.11a Has a Mismatch between 1. Packet length and 2. Data Rate & Number of Bytes OFDM Symbol Contains Multiple Data Bytes Data bytes may not fill last OFDM symbol Last symbol extended with scrambled zeros

11 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 11 Compatibility with 802.11b SIFS HRb Signal w/o Extension HRb Data Length usecs Length usecs HRb Signal w/ Extension Packet Energy Not Integer # of usecs BARKER SYNC BARKER SYNC BARKER HEADER BARKER HEADER HRb Data Read Length usecs With Extension This Signal Extension Also Provides On-the-Air Packet-Length Consistency

12 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 12 INTERSIL’s OFDM Proposal Achieves Compatibility with 802.11b SIFS 802.11 HRb OFDM OFDM Data ACK 10 usecs SIFS Signal Extend ~ 6 usecs BARKER HEADER BARKER SYNC Length usecs Read Length usecs Start Receiver Flush: FFT, De-interleave, FEC Decode Maintain 802.11b air interface Create flush-processing margin by packet signal extension. Extend to integer # of usecs consistent with length field in Barker preamble header Maintains CCA energy

13 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 13 PLME-TXTIME.Confirm Primitive Calculation for Long/Short Preambles TXTIME (usecs) = PreambleLength +PLCPHeaderTime + Ceiling( OfdmSync + + OfdmSigField + 4 *(16 + 8*LENGTH + 6 )/ N DBPS )*20/22 + SignalExtension) Flush Processing Margin Length of PSDU in Octets Number of Data Bits Per OFDM Symbol Clock Rate Conversion 802.11a: 20 MHz HRb: 22 MHz FEC Flush Bits Scrambler State & Full-Rate Service Field Representative Calculation

14 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 14 INTERSIL’s HRb OFDM Proposal Reuses 802.11b’s Long/Short Preamble/Header

15 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 15 HRb Long/Short Preamble Definition HEADER 48 BITS @ 2 Mbps PREAMBLE 72 BITS @ 1 Mbps PSDU SELECTABLE @ 2, 5.5 OR 11 Mbps HEADER 48 BITS @ 1 Mbps PREAMBLE 144 BITS @ 1 Mbps PSDU SELECTABLE @ 1, 2, 5.5 OR 11 Mbps 802.11b LONG PREAMBLE 802.11b SHORT PREAMBLE 96 usecs 192 usecs 1 and 2 Mbps uses 11 chip BARKER codes. 5.5 and 11 Mbps uses 8 chip CCK codes. Chipping is at 11 MHz. Data Payload CURRENT 802.11b PREAMBLES

16 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 16 HEADER 48 BITS @ 2 Mbps PREAMBLE 72 BITS @ 1 Mbps HEADER 48 BITS @ 1 Mbps PREAMBLE 144 BITS @ 1 Mbps 802.11 HRb LONG PREAMBLE 802.11 HRb SHORT PREAMBLE 96 usecs 192 usecs Data Payload OFDM SYNC OFDM SYNC 10.9 usecs Service Field Bit Denotes Switch to OFDM Service Field Bit Denotes Switch to OFDM PSDU SELECTABLE OFDM Symbols @ 6.6, 9.6, 13.2, 19.8, 26.4, 39.3, 52.8 or 59.4 Mbps PREAMBLES for 802.11 HRb: Reuse 802.11b preambles PSDU SELECTABLE OFDM Symbols @ 6.6, 9.6, 13.2, 19.8, 26.4, 39.3, 52.8 or 59.4 Mbps Fine-Tune SYNC

17 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 17 HEADER 48 BITS 4 bits to denote extended data rates 4 bits of 5 to identify # bytes in last OFDM symbol. SIGNAL 8 BITS SERVICE 8 BITS LENGTH 16 BITS CRC 16 BITS HRb SHORT/LONG-PREAMBLE HEADER DETAIL Unchanged 1 bit to denote OFDM mode. 1 bit of 5 to identify # bytes in last OFDM symbol. Unchanged. The Length Field is adequate, since measured in usecs. OFDM proposal uses PSDU length in an integer number of usecs.

18 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 18 Signal Field Bit Definitions b0b1b2b3b4b5b6b7 802.11b Signal Field New 802.11 HRb OFDM Signal Field b0b1b2b3b4b5b6b7 Data Rate Mbps = 0.1 Mbps x ( b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 ) base 2 Rate 6.6 Mbps 9.9 13.2 19.8 26.4 39.6 52.8 59.4 b0-b3 1101 1111 0101 0111 1001 1011 0001 0011 25.5 Mbps maximum Last Sym Bytes Resolve Bit 0 Last Sym Bytes Resolve Bit 1 Last Sym Bytes Resolve Bit 2 Last Sym Bytes Resolve Bit 3

19 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 19 Service Field Bit Definitions Reserved b0 Reserved b1 Locked Clock Bit 0 = not 1 = Locked b2 Mod. Selec- tion Bit 0 = CCK 1 = PBCC b3 Reserved b4 Reserved b5 Reserved b6 Length Extension Bit b7 b0b1b2b3 Reserved b4b5 Reserved b6b7 Mod. Selec- tion Bit 0 = not 1 = OFDM Locked Timing/Carrier Clocks Mandatory 802.11b Service Field New 802.11 HRb OFDM Service Field Last Sym Bytes Resolve Bit 4 ReservedLocked Clock Bit 0 = not 1 = Locked Mod. Selec- tion Bit 0 = CCK 1 = PBCC Reserved

20 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 20 Resolve Last-OFDM-Symbol Number-of-Bytes OFDM Symbol Contains Multiple Data Bytes Data bytes may not fill last OFDM symbol Last symbol extended with scrambled zeros 802.11b Rate Mbps Bytes/Symbol 6.6 3 9.9 4.5 13.2 6 19.8 9 26.4 12 39.6 18 52.8 24 59.4 27 Symbol Last Symbol 3.64 usecs Signal Extension How Many Information Bytes? 5 bits Needed to Resolve 0 thru 27 Bytes in Last Symbol for 59.4 Mbps

21 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 21 Is Some Type of OFDM SYNC Desirable? HEADER 48 BITS @ 2 Mbps PREAMBLE 72 BITS @ 1 Mbps HEADER 48 BITS @ 1 Mbps PREAMBLE 144 BITS @ 1 Mbps 802.11 HRb LONG PREAMBLE 802.11 HRb SHORT PREAMBLE 96 usecs 192 usecs Data Payload OFDM SYNC ? OFDM SYNC ? ? usecs PSDU SELECTABLE OFDM Symbols @ 6.6, 9.6, 13.2, 19.8, 26.4, 39.3, 52.8 or 59.4 Mbps PSDU SELECTABLE OFDM Symbols @ 6.6, 9.6, 13.2, 19.8, 26.4, 39.3, 52.8 or 59.4 Mbps Fine Tune Demod

22 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 22 Function of 802.11a OFDM SYNC PSDU SELECTABLE @ 6, 9, 12, 18, 24, 36, 48 or 54 Mbps SIGNAL SYMBOL OFDM SYNC 16 usecs4 usecs 802.11a Packet Structure 8 usecs Short SYNC Long SYNC Data Rate # bytes of data Data Payload Signal Detect AGC Coarse Frequency Timing Sync (FFT alignment) Fine Frequency Channel Estimation

23 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 23 Is a SSYNC Desirable for Barker-to-OFDM Transition? What is SSYNC used for in 802.11a? AGC pull-in, etc Coarse frequency estimate Signal Detect Time synchronization (FFT alignment) Not Necessary for HRb OFDM Long/Short Preambles

24 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 24 Is a SSYNC Desirable for Barker-to-OFDM Transition? Pulse Shaping Filter Multipath Channel 802.11b Long/Short Pream/HDR HRb OFDM Symbols 0 freq TX Spectrum 0 freq TX Spectrum Diversity loss for OFDM Pulse shape for preamble? CIR Estimator Guard Interval Align T  Timing Align Barker-to-OFDM Transition Barker CIR time OFDM CIR

25 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 25 Is an SSYNC Desirable for Barker-to-OFDM Transition?.... YES Propose using SSYNC Enables different pulse-shaping options in transmitter. (Performance enhancement) Allows independent guard interval alignment (Performance enhancement) Only 4 usecs needed (5 short syncs) for sufficient SNR.

26 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 26 Comparing 802.11a SSYNC to Long/Short Preamble HRb SSYNC 8 usecs 802.11a SSYNC 12345678910 4 usecs 802.11 HRb Long/Short Preamble SSYNC 12345

27 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 27 Is an LSYNC Desirable for Barker-to-OFDM Transition? What is LSYNC used for in 802.11a? Fine frequency estimate FEQ design (CIR estimate) Not Necessary for HRb OFDM Long/Short Preambles

28 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 28 Channel Estimation: Comparing 802.11b’s and 802.11a’s Spectrum Pulse Shaping Filter Multipath Channel 802.11b TX Signal CIR Estimator Multipath Channel 802.11a TX Signal CIR Estimator 0 freq Guard Interval Align Affects Sub-carrier Phase TX Spectrum TX Spectrum Root Nyquist Like Flat 802.11b 802.11a

29 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 29 HRb Channel Estimation: OPTION with Barker/OFDM CIR Discontinuity Pulse Shaping Filter Multipath Channel 802.11b Long/Short Pream/HDR HRb OFDM Symbols 0 freq TX Spectrum 0 freq TX Spectrum Diversity loss for OFDM Pulse shape for preamble? CIR Estimator Guard Interval Align Affects Sub-carrier Phase This option requires a separate channel estimate for OFDM

30 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 30 Is an LSYNC Desirable for Barker-to-OFDM Transition?.... YES Propose using LSYNC Enables different pulse-shaping options in transmitter. (Performance enhancement) Provides freedom from maintaining strict gain/phase continuity in transmitter. (Simplification) Frees receiver from maintaining strict gain/phase continuity during transition. (Simplification) Allows reuse of 802.11a channel estimation algorithms. (Reuse) Avoids total dependence upon channel estimation using Barker codes. (Simplification) Allows independent guard interval alignment without extra compensation circuit. (Simplification) 8 usecs still needed for SNR enhancement.

31 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 31 Carrier Offset Retain +/- 25 PPM transmit or receive accuracy. Long and short preambles provide plenty of time for carrier recovery before OFDM portion of packet occurs. Essentially no performance loss.

32 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 32 Timing Offset Intersil proposes mandatory use of locked oscillators for all 802.11 HRb radios. Timing offset then becomes a trivial tracking of the carrier offset. Either polyphase filtering or FFT time- stepping can be used. Essentially no performance loss.

33 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 33 Antenna Diversity The 802.11b preambles are sufficiently long to support antenna diversity with low- complexity AGC’s.

34 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 34 Summary of Proposed Packet Structure Reusing 802.11b Long/Short Preambles PREAM/HDR 72 BITS @ 1 Mbps PREAMBLE/HEADER 802.11 HRb LONG PREAMBLE 802.11 HRb SHORT PREAMBLE 96 usecs 192 usecs Data Payload 10.9 usecs PSDU SELECTABLE OFDM Symbols @ 6.6, 9.6, 13.2, 19.8, 26.4, 39.3, 52.8 or 59.4 Mbps PSDU SELECTABLE OFDM Symbols @ 6.6, 9.6, 13.2, 19.8, 26.4, 39.3, 52.8 or 59.4 Mbps OFDM SYNC OFDM SYNC 10.9 usecs ~6 usecs Signal Extension ~6 usecs Signal Extension

35 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 35 Throughput Impact (100 byte packet) 802.11b Long Preamble 802.11b Short Preamble 802.11 HRb Short Preamble 802.11 HRb Long Preamble

36 doc.: IEEE 802.11-00/390 Submission November 2000 Mark Webster and Steve Halford, IntersilSlide 36 Throughput Impact (1000 byte packet) 802.11b Long Preamble 802.11b Short Preamble 802.11 HRb Short Preamble 802.11 HRb Long Preamble

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