doc.: ieee 802.11-15/1056r1 submission clarifying link level simulator assumptions sept 2015 1 date:...

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doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital) N am e A ffiliations A ddress Phone em ail K om e O teri InterD igital Com m unication Inc. 9710 Scranton Road, San D iego,CA , 92121 858 210 4826 [email protected] Nirav Shah Frank La Sita RobertO lesen D aew on Lee N ew racom 9008 Research D r Irvine,C A 92618 678 294 2598 daew on.lee atnew racom .com M inho Cheong m inho.cheong atnew racom .com

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Page 1: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

Clarifying Link Level Simulator Assumptions

Sept 2015

1

Date: 2015-09-13

Authors:

Kome Oteri (InterDigital)

Name Affiliations Address Phone email Kome Oteri

InterDigital Communication Inc.

9710 Scranton Road, San Diego, CA, 92121

858 210 4826 [email protected]

Nirav Shah

Frank La Sita

Robert Olesen

Daewon Lee Newracom

9008 Research Dr Irvine, CA 92618

678 294 2598 daewon.lee at newracom.com

Minho Cheong minho.cheong at newracom.com

Page 2: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 2

Motivation• The simulation assumptions of the different types of system level simulators

have been well defined in the Evaluation Methodology document [1].– The results have also been calibrated in [2].

• Link level simulation results obtained may vary widely based on the simulation assumptions and impairments such as the CFO, phase noise and timing offset models.– We would like to clarify the assumptions used for various link level

simulator parameters, impairments, assumptions and models. – We would like to update the 802.11ac assumptions and impairments found

in [3] to reflect the requirements for 802.11ax and place these in the evaluation methodology document.

Sept 2015

Kome Oteri (InterDigital)

Page 3: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 3Internal Confidential: Internal Use Only – InterDigital Confidential and Proprietary

Current 802.11ac Impairments [3]

• PA non-linearity• Carrier Frequency Offset :

– DL [-20,20] ppm– UL MU-MIMO [-2,2] kHz

• Timing acquisition/preamble detection on a per-packet basis• Phase Noise : Uses pole zero model at both Tx and Rx• Noise Figure : 10 dB• Antenna Configuration : ULA with ½ lambda separation• Fluorescent Lighting : Not considered• Timing : UL MU from [-100 to 100] ns

Sept 2015

Kome Oteri (InterDigital)

Page 4: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 4Internal Confidential: Internal Use Only – InterDigital Confidential and Proprietary

Simulation Assumption Examples in 802.11ax• DC tone design [4]

– 40 ppm CFO before frequency correction• SISO 1x1, 20 MHz results [4]

– Channel estimation, CFO estimation, phase tracking all real, initial phase noise added

• SISO 1x1, 80 MHz results [5]– Channel estimation real, CFO estimation real, phase tracking is assumed

present• UL OFDMA, 20 MHz: [4]

– Frequency offset of each user is uniformly distributed over +/- 235KHz and +/-100KHz

• UL MU-MIMO, 20 MHz [6]– Frequency offset of each user distributed over 400 Hz

Kome Oteri (InterDigital)

Sept 2015

Page 5: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 5Internal Confidential: Internal Use Only – InterDigital Confidential and Proprietary

Typical TGax Link Level Simulations

• We will show how typical TGax link level simulator results can change based on differing assumptions– Some of the assumptions can be clearly inferred from the 802.11ac

assumptions [3] and the latest 80211ax specification framework [10]– Some of the assumptions need to be further defined

Sept 2015

Kome Oteri (InterDigital)

Page 6: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 6

Clearly Defined Assumptions

Sept 2015

Kome Oteri (InterDigital)

Page 7: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

Assumptions to be Clarified

• These parameters may result in widely varying link level performances

Sept 2015

Kome Oteri (InterDigital)7

Parameter Value

CFO Model Residual / CFO Compensation & Tracking

PPM / kHz

Randomly distributed within [x, y] over a uniform distribution, x and y undefined

Integrated Phase Noise None / Model [3]

Timing Acquisition Ideal / Per-packet-basis

Timing offset Uniform over users, [0,…, Tmax], Tmax undefined

I/Q Imbalance model Not specified

Page 8: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 8

No Impairments Slide 17 from 11-15/0569r1 [7]Slide 42 from 11-15/0330r5 [4]

Simulator 1 Results

No CFOResidual CFO

CFO & Phase noise with CFO, time and phase trackingSlide 33 from 11-15/0349r2 [5]

Sept 2015

Kome Oteri (InterDigital)

Page 9: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 9

Simulator 2 Assumptions

Sept 2015

Kome Oteri (InterDigital)

RU Size

242 RU (234/8 data/pilot) 996 RU (980/16 data/pilot)

MCS 9 (256QAM, 5/6) 9 (256QAM, 5/6)

Tx/Rx Ant. 1x1 1x1

Channel Est. real real

Initial CFO None / 20 kHz None / 20 kHz

CFO Compensation & Tracking None / Real None / Real

Phase Noise(both at Tx and Rx) None / 11n None / 11n

Channel Model Ch.D Ch.D

APEP_LENGTH 1000 Byte 1000 Byte

Coding BCC LDPC (25 iterations)

Time Synchronization Ideal / Real Ideal / Real

Receiver Linear receiver Linear receiver (Exact LLR)

Page 10: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission 10

Simulator 2 Results

Sept 2015

Kome Oteri (InterDigital)

20 22 24 26 28 30 32 34 36 38 40

SNR per Data Tone [dB]

10-2

10-1

100

PE

R

SISO 1x1 ChD, BCC 242 RU

No Impairments

With Impairments

24 26 28 30 32 34 36 38 40 42

SNR per Data Tone [dB]

10-2

10-1

100

PE

R

SISO 1x1 ChD, LDPC 996 RU

No Impairments

With Impairments

Page 11: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

Conclusion

• We show that the link level results may vary widely based on impairment assumptions such as CFO Model and phase noise model

• We would like these assumptions to be specified in the 802.11ax evaluation methodology document

Sept 2015

Kome Oteri (InterDigital)11

Page 12: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

Straw Poll #1

Do you agree to the following?• Link level simulator assumptions and impairments shall be clarified

for 802.11ax and changes from 802.11ac shall be identified

• Y/N/A

Kome Oteri (InterDigital)12

Sept 2015

Page 13: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

Straw Poll #2

Do you agree with the following?• A table listing PHY impairments for 802.11ax shall be added to the

EM document

• Y/N/A

Sept 2015

Kome Oteri (InterDigital)13

Page 14: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

References

1. 11-14-0571-10-00ax-evaluation-methodology.docx

2. 11-15-0125-04-00ax-box-1-and-box-2-calibration-results.xlsx

3. 11-09-0451-16-00ac-tgac-functional-requirements-and-evaluation-methodology.doc

4. 11-15-0330-05-00ax-ofdma-numerology-and-structure.pptx

5. 11-15-0349-02-00ax-he-ltf-proposal.pptx

6. 11-15-0602-04-00ax-he-ltf-squence-for-ul-mu-mimo.pptx

7. 11-15-0569-01-00ax-performance-of-1x-2x-and-4x-he-ltf.pptx

8. 11-14-0882-04-00ax-tgax-channel-model-document.docx

9. 11-15-0580-01-00ax-11ax-coding-discussion.pptx

10. 11-15-0132-07-00ax-spec-framework.docx

Sept 2015

Kome Oteri (InterDigital)14

Page 15: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

PHY Impairments for 802.11ac [3]

Sept 2015

Kome Oteri (InterDigital)15

Page 16: Doc.: IEEE 802.11-15/1056r1 Submission Clarifying Link Level Simulator Assumptions Sept 2015 1 Date: 2015-09-13 Authors: Kome Oteri (InterDigital)

doc.: IEEE 802.11-15/1056r1

Submission

PHY Impairments for 802.11ac (ctd) [3]

Sept 2015

Kome Oteri (InterDigital)16