July 2012 doc IEEE 802 11 120833 r

July 2012 Submission doc. : IEEE 802. 11 -12/0833 r 1 Slide 2 Eugene

July 2012 Submission doc. : IEEE 802. 11 -12/0833 r 1 Slide 3 Eugene

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Abstract • Proposal for

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Background for Cyclic Shift

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Framework for CSD Application

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Framework Summary for CSDs

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 CSD Evaluation Metric •

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 CSD Evaluation Metric (cont.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 and 2 MHz

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Optimal >=2 MHz Short

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Optimal >=2 MHz Long

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz - 2

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Optimal 1 MHz Frame

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #1 • Do

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #2 • Do

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #3 • Do

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #4 • Do

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #1 • Move

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #2 • Move

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #3 • Move

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #4 • Move

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 • Appendix – 1

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz Frame and

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 >=2 MHz Long Frame

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz - 3

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz - 4

Slides: 28

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July 2012 doc. : IEEE 802. 11 -12/0833 r 1 802. 11 ah - CSD Table Values Date: 2012 -07 -16 Authors: Submission Slide 1 Eugene Baik – Qualcomm, Inc.

July 2012 Submission doc. : IEEE 802. 11 -12/0833 r 1 Slide 2 Eugene Baik – Qualcomm, Inc.

July 2012 Submission doc. : IEEE 802. 11 -12/0833 r 1 Slide 3 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Abstract • Proposal for CSD framework and CSD table values for 802. 11 ah 1 MHz and >=2 MHz Tx. Submission Slide 4 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Background for Cyclic Shift Delays (CSDs) • Fixed and periodic STF sequence transmitted across multiple spatial streams/antennas can have effect of being unintentionally beamformed – Rx. AGC is set according to power measurement on STF – AGC setting will determine quantization/saturation effects for the ADC • Can negatively affect SIG/Data field decoding performance – CSDs across spatial streams/antennas reduce Rx. Power fluctuations during STF Submission Slide 5 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Framework for CSD Application in 11 ah • CSD design criteria for 11 ah should follow that used for 11 ac: – See Appendix for detailed information on Frame-specific Tx Structures • Defined frame formats for 11 ah: – 1 MHZ Preamble, >=2 MHz Short Preamble • 1 set of CSDs applied for entire frame – >=2 MHz Long Preamble • Separate STFs means different sets of CSDs can be used for Omni and Data portions Data Portion Submission Slide 6 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Framework Summary for CSDs • Use per-space-time-stream CSD tables for – 1 MHz frame format – >=2 MHz Short frame format – >=2 MHz Long frame format, Data portion • Restart CSD application afresh for each user’s space time streams (Same as in 11 ac). • For >=2 MHz Long frame format, Omni Portion: – Use per-antenna CSD table • Construct table of CSDs for each case that minimizes unintentional beamforming effect: – Nested structure constraint desirable if no impact on performance • 3 Tx case shares 2 of its CSDs with the 2 Tx case, and the 4 Tx case shares 3 CSDs with the 3 Tx case. • Facilitates cleaner implementation in hardware Submission Slide 7 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 CSD Evaluation Metric • To minimize quantization/saturation at ADC, difference between measured STF and Data (or SIG) power should be low, and CDF of metric should be tight. • • STF is fixed periodic sequence, same for each stream 1 MHz STF and 2 MHz STF – CSD values from 11 n/11 ac (2 MHz) were chosen w. r. t. D-NLOS channel. • Re-examine CSD choice with SCM UMa also taken into consideration – 1 MHz STF is no longer simple downclock of 20 MHz 11 n/11 ac STF, therefore perform full search to find best CSD choices Submission Slide 8 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 CSD Evaluation Metric (cont. ) Saturation Quantization • Example: – 1 MHz, 2 Tx Streams – CSD = [0 -3]μs – Consider 95 th%-tile • AWGN (rand phase), • DNLOS (stretched), • SCM Urban Macro • Choose CSD that minimizes following metric: ABS(MIN(5 th ptile)) + ABS(MAX(95 th ptile)) Where MAX and MIN look over the channel models being considered 5 th%-tile Metric is sum of dotted RED distances Submission Slide 9 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 and 2 MHz CSD Selection • Simluation Setup – 1 and 2 MHz Channel Bandwidths • Estimate STF Rx. Power over STF field duration • Estimate Data Rx. Power (BPSK modulated) over same duration – Num. Tx. Streams = [2: 4], w/ Rand. Phase Offsets {0, π} per stream – 2 x 2, 3 x 3, 4 x 4 Channel Models: • AWGN (i. e. flat w/ random phase) • D-NLOS (stretched) • SCM Urban Macro – CSD values range from -[0 : 1 : 7]μs for 1 MHz, -[0 : 0. 5 : 7. 5]μs for 2 MHz. • Unique value used for each Tx stream • 1 st stream has no CSD offset (i. e. 0 us) • Example: 1 MHz 4 Tx Stream case has 35 possible CSD combinations – Search across all CSD combinations to select best CSD according to metric. Submission Slide 10 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Optimal >=2 MHz Short Frame, Long (Data Portion) Frame CSD Tables (CSD values listed in absolute time (μs) rather than BW-dependent samples) • Specified per-Tx-Stream • Results show scaled 11 n/11 ac values are also best choice for 11 ah >=2 MHz in SCM UMa. T_cs(n) for >=2 MHz, Short Frame Format and Data portion of Long Frame Format Total Cyclic shift (for Tx Stream n) (μs) number of spacetime 1 2 3 4 streams 1 0 2 0 -4 3 0 -4 -2 4 0 -4 -2 -6 – STF pattern remains same Submission Slide 11 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Optimal >=2 MHz Long (Omni Portion) Frame CSD Tables (CSD values listed in absolute time (μs) rather than BW-dependent samples) • Specified per-Tx. Antenna: T_cs(n) for >=2 MHz, Omni Portion of Long Frame Format Cyclic shift (for Tx Antenna n) (μs) Total number of Tx antennas 1 2 3 4 1 0 2 0 -4 3 0 -4 -2 4 0 -4 -2 -6 – SIG is replicated across Tx. Antennas – Same shift values as >=2 MHz Long (Data portion) Frame table Submission Slide 12 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz - 2 Tx Stream Case Simulations CSDs for 2 Tx Antenna: SCM UMa Channel • [0 -4]us is best choice across all channel models for 2 Tx Antenna CSD – Clearly do want to use some CSD (i. e. not [0 0]us) – SCM UMa is the worst-case: 5 -to-95%-tile spread approx. 6 d. B • Quantitative results of CSD combinations for {2, 3, 4} Tx Stream shown in Appendix. Submission Slide 13 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Optimal 1 MHz Frame CSD Tables (CSD values listed in absolute time (μs) rather than BW-dependent samples) • Specified per-Tx. Stream Total number of spacetime streams 1 2 3 4 – Different from >=2 MHz per-Tx-stream CSDs because 1 MHz STF is new. Submission Slide 14 T_cs(n) for 1 MHz Frame Format Cyclic shift (for Tx Stream n) (μs) 1 0 0 2 -4 -4 -4 3 -1 -1 4 -5 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #1 • Do you agree with the application of CSDs on a: – Per-space-time-stream basis for the 1 MHz and >=2 MHz Short frame formats? – Per-space-time-stream basis for the Data portion of the >=2 MHz Long frame format? – Per-antenna basis for the Omni portion of the >=2 MHz Long frame format? – Y – N – A Submission Slide 15 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #2 • Do you agree to adopt the following CSD table (reproduced below) for the Short frame format and Data portion of the Long frame format for >= 2 MHz Long Frame Format, >=2 MHz modes? – Y – N – A Data Portion T_cs(n) for >=2 MHz, Short Frame Format and Data portion of Long Frame Format Total Cyclic shift (for Tx Stream n) (μs) number of spacetime 1 2 3 4 streams 1 0 2 0 -4 3 0 -4 -2 4 0 -4 -2 -6 Submission Slide 16 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #3 • Do you agree to adopt the following CSD table (reproduced below) for the Omni portion of >=2 MHz Long frame format? – Y – N – A Long Frame Format, >=2 MHz Data Portion T_cs(n) for >=2 MHz, Omni Portion of Long Frame Format Cyclic shift (for Tx Antenna n) (μs) Total number of Tx antennas 1 2 3 4 1 0 2 0 -4 3 0 -4 -2 4 0 -4 -2 -6 Submission Slide 17 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Strawpoll #4 • Do you agree to adopt the following CSD table (reproduced below) for the 1 MHz Short frame format? – Y – N – A Short Frame Format, 1 MHz Total number of spacetime streams 1 2 3 4 Submission T_cs(n) for 1 MHz Frame Format Cyclic shift (for Tx Stream n) (μs) 1 0 0 Slide 18 2 -4 -4 -4 3 -1 -1 4 -5 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #1 • Move to define the application of CSDs on a: – Per-space-time-stream basis for the 1 MHz and >=2 MHz Short frame formats? – Per-space-time-stream basis for the Data portion of the >=2 MHz Long frame format? – Per-antenna basis for the Omni portion of the >=2 MHz Long frame format? – Y – N – A Submission Slide 19 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #2 • Move to adopt the following CSD table (reproduced below) for the Short frame format and Data portion of the Long frame format, for >= 2 MHz modes? – Y – N – A Long Frame Format, >=2 MHz Data Portion T_cs(n) for >=2 MHz, Short Frame Format and Data portion of Long Frame Format Total Cyclic shift (for Tx Stream n) (μs) number of spacetime 1 2 3 4 streams 1 0 2 0 -4 3 0 -4 -2 4 0 -4 -2 -6 Submission Short Frame Format, >=2 MHz Slide 20 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #3 • Move to adopt the following CSD table (reproduced below) for the Omni portion of >=2 MHz Long frame format? – Y – N – A Long Frame Format, >=2 MHz Data Portion T_cs(n) for >=2 MHz, Omni Portion of Long Frame Format Cyclic shift (for Tx Antenna n) (μs) Total number of Tx antennas 1 2 3 4 1 0 2 0 -4 3 0 -4 -2 4 0 -4 -2 -6 Submission Slide 21 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 Motion #4 • Move to adopt the following CSD table (reproduced below) for the 1 MHz frame format? – Y – N – A 1 MHz Frame Format Total number of spacetime streams 1 2 3 4 Submission T_cs(n) for 1 MHz Frame Format Cyclic shift (for Tx Stream n) (μs) 1 0 0 Slide 22 2 -4 -4 -4 3 -1 -1 4 -5 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 • Appendix – 1 MHz Frame, 2 MHz Short Frame Tx Structure – >=2 MHz Long Frame Tx Structure – 1 MHz CSD Search Data Submission Slide 23 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz Frame and 2 MHz Short Frame Tx Structure • Same CSD values applied to entire Short packet, according to value of N_sts Submission Slide 24 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 >=2 MHz Long Frame Tx Structure Can use per-Tx-Antenna CSDs as there is no Q-Matrix involved. CSD application prior to Q-Matrix is performed per-Tx. Stream. Choice of Q-Matrix is up to implementer, hence don’t specify per-antenna CSDs Submission Slide 25 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz - 2 Tx Stream CSD Rankings -0. 62 -1. 23 -1. 26 -2. 42 -1. 21 -1. 27 -2. 49 5 th ptile 0. 83 1. 25 1. 27 1. 81 1. 24 1. 27 1. 85 95 th ptile AWGN • • -1. 12 -1. 44 -1. 45 -2. 06 -3. 46 -3. 51 -2. 09 5 th ptile 1. 05 1. 31 1. 61 2. 06 2. 08 1. 63 95 th ptile DNLOS (stretched) -1. 76 -1. 81 -3. 08 -2. 63 -3. 36 -3. 51 5 th ptile 1. 45 1. 58 1. 60 2. 11 1. 94 2. 09 2. 25 95 th ptile SCM Urban Macro 1. 45 1. 58 1. 60 2. 11 2. 06 2. 09 2. 25 -1. 76 -1. 81 -3. 08 -3. 46 -3. 51 3. 21 3. 39 3. 41 5. 19 5. 52 5. 59 5. 76 MAX of MIN of 5% 95% of of abs(MAX) Channel + Models abs(MIN) [0 4] [0 3] [0 5] [0 2] [0 7] [0 1] [0 6] CSD Vector CSD Metric = STF Pwr/Data Pwr 5 th and 95 th percentile points of CDF of Metric Values in d. B Ranking by abs(MAX) + abs(MIN) metric Submission Slide 26 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz - 3 Tx Stream CSD Rankings -1. 17 -1. 14 -1. 18 -1. 15 -1. 19 -1. 14 -1. 68 -3. 02 5 th ptile 1. 44 1. 40 1. 42 1. 46 1. 47 1. 44 1. 94 1. 55 95 th ptile AWGN -2. 46 -2. 41 -2. 47 -2. 45 -2. 39 -2. 68 -2. 03 5 th ptile 1. 80 1. 79 1. 82 1. 83 1. 84 1. 82 2. 00 1. 58 95 th ptile DNLOS (stretched) -2. 39 -2. 61 -2. 04 -1. 96 -2. 70 -2. 66 -2. 20 5 th ptile 1. 94 1. 84 2. 02 2. 13 1. 95 2. 08 2. 13 1. 85 95 th ptile SCM Urban Macro 1. 94 1. 84 2. 02 2. 13 1. 95 2. 08 2. 13 1. 85 -2. 46 -2. 61 -2. 47 -2. 70 -2. 66 -2. 68 -3. 02 4. 40 4. 45 4. 49 4. 61 4. 64 4. 74 4. 81 4. 87 MAX of MIN of 5% 95% of of abs(MAX) Channel + Models abs(MIN) [0 1 4] [0 3 7] [0 1 5] [0 3 4] [0 4 5] [0 4 7] [0 5 7] [0 3 5] CSD Vector • Ranking by abs(MAX) + abs(MIN) metric – Top 8 CSD choices shown for 3 Tx Streams Submission Slide 27 Eugene Baik – Qualcomm, Inc.

July 2012 doc. : IEEE 802. 11 -12/0833 r 1 1 MHz - 4 Tx Stream CSD Rankings -1. 32 -2. 63 -1. 40 -1. 27 -2. 73 -1. 44 -2. 53 -2. 51 -2. 47 -2. 67 -2. 45 -2. 49 -2. 59 -1. 41 -2. 57 -1. 44 -2. 72 -2. 54 -2. 56 -2. 74 1. 54 1. 77 1. 88 1. 56 1. 90 1. 93 1. 49 1. 77 1. 50 1. 89 1. 50 1. 80 1. 86 1. 79 1. 89 1. 90 1. 79 1. 80 1. 95 5 th ptile 95 th ptile AWGN -2. 63 -2. 48 -2. 70 -2. 64 -2. 61 -2. 75 -2. 83 -2. 59 -2. 71 -2. 61 -2. 76 -2. 77 -2. 91 -2. 69 -2. 80 -2. 76 -2. 68 -2. 86 -2. 84 -3. 25 1. 94 1. 90 2. 02 1. 95 1. 97 2. 09 1. 89 2. 08 1. 97 2. 09 2. 16 2. 06 2. 16 2. 08 1. 92 2. 13 2. 17 2. 36 5 th ptile 95 th ptile DNLOS (stretched) -2. 44 -2. 49 -2. 63 -2. 40 -2. 82 -2. 42 -2. 67 -2. 99 -2. 87 -2. 85 -2. 88 -2. 72 -2. 96 -2. 64 -2. 73 -3. 13 -3. 05 -3. 22 -3. 37 -3. 10 1. 95 1. 98 2. 11 2. 25 2. 14 2. 26 2. 18 2. 02 2. 15 2. 18 2. 15 2. 29 2. 03 2. 50 2. 39 2. 19 2. 38 2. 30 2. 16 2. 26 5 th ptile 95 th ptile SCM Urban Macro 1. 95 1. 98 2. 11 2. 25 2. 14 2. 26 2. 18 2. 02 2. 15 2. 18 2. 15 2. 29 2. 16 2. 50 2. 39 2. 19 2. 38 2. 30 2. 17 2. 36 -2. 63 -2. 70 -2. 64 -2. 82 -2. 75 -2. 83 -2. 99 -2. 87 -2. 85 -2. 88 -2. 77 -2. 96 -2. 69 -2. 80 -3. 13 -3. 05 -3. 22 -3. 37 -3. 25 4. 57 4. 61 4. 89 4. 97 5. 01 5. 02 5. 03 5. 04 5. 05 5. 11 5. 19 5. 20 5. 32 5. 43 5. 52 5. 54 5. 61 [0 1 4 5] [0 3 5 7] [0 2 3 7] [0 3 4 7] [0 1 3 6] [0 1 5 6] [0 1 2 5] [0 2 3 6] [0 3 6 7] [0 3 5 6] [0 1 4 7] [0 3 4 5] [0 1 2 6] [0 4 5 7] [0 2 3 4] [0 1 3 4] [0 2 3 5] [0 4 6 7] [0 4 5 6] [0 1 6 7] MAX of MIN of 5% 95% of of abs(MAX) Channel + Models abs(MIN) CSD Vector • Ranking by abs(MAX) + abs(MIN) metric – Top 20 CSD choices shown for 4 Tx Streams Submission Slide 28 Eugene Baik – Qualcomm, Inc.