doc.: IEEE 802.11-13/1367r0

Submission

Nov 2013

Mingguang Xu, et. Al.Slide 1

Tx EVM for MCS-10 in 802.11ah

Date: 2013-11-10Authors:

Name Affiliations Address Phone email Mingguang Xu Marvell 5488 Marvell Lane,

Santa Clara, CA 95054 mxu@marvell.com

Hongyuan Zhang Marvell Hongyuan@marvell.com

Yakun Sun Marvell yakunsun@marvell.com

Sudhir Srinivasa Marvell sudhirs@marvell.com

Hui-Ling Lou Marvell hlou@marvell.com

Eldad Perahia Intel Corp. eldad.perahia@intel.com

Shahrnaz Azizi Intel Corp. shahrnaz.azizi@intel.com

Tom Tetzlaff Intel Corp. thomas.a.tetzlaff@intel.com

Thomas Kenney Intel Corp. thomas.j.kenney@intel.com

Yongho Seok LG Electronics LG R&D Complex Anyang-Shi, Kyungki-Do, Korea

+82-31-450-1947 yongho.seok@lge.com

Jinsoo Choi LG Electronics

Jeongki Kim LG Electronics

Hangyu Cho LG Electronics

Vinko Erceg Broadcom verceg@broadcom.com

Ron Porat Broadcom rporat@broadcom.com

Nihar Jindal Broadcom

Jun Zheng Broadcom

Rojan Chitrakar Panasonic Rojan.Chitrakar@sg.panasonic.com

Ken Mori Panasonic mori.ken1@jp.panasonic.com

Harya Wicaksana Panasonic Harya.Wicaksana@sg.panasonic.com

doc.: IEEE 802.11-13/1367r0

Submission

Nov 2013

Mingguang Xu, et. Al.Slide 2

Name Affiliations Address Phone email

Sameer Vermani Qualcomm svverman@qti.qualcomm.com

Eugene Baik Qualcomm

Lin Yang Qualcomm

Tao Tian Qualcomm

Bin Tian Qualcomm

Hemanth Sampath Qualcomm

Richard Van Nee Qualcomm

Allert Van Zelst Qualcomm

VK Jones Qualcomm

Sun, Bo ZTE sun.bo1@zte.com.cn

Lv, Kaiying ZTE lv.kaiying@zte.com.cn

Huai-Rong Shao Samsung hr.shao@samsung.com

Chiu Ngo Samsung chiu.ngo@samsung.com

Minho Cheong ETRI 138 Gajeongno, Yuseong-gu, Dajeon, Korea

+82 42 860 5635 minho@etri.re.kr

Jae Seung Lee ETRI jasonlee@etri.re.kr

Hyoungjin Kwon ETRI kwonjin@etri.re.kr

Jaewoo Park ETRI parkjw@etri.re.kr Sok-kyu Lee ETRI Sk-lee@etri.re.kr

Sayantan Choudhury Nokia 2075 Allston Way, Suite 200, Berkeley, CA 94704

+1 510 599 9268 sayantan.choudhury@nokia.com

Klaus Doppler Nokia

doc.: IEEE 802.11-13/1367r0

Submission

Nov 2013

Mingguang Xu, et. Al.Slide 3

Name Affiliations Address Phone email Shoukang Zheng I2R 1 Fusionopolis Way, #21-01

Connexis Tower, Singapore 138632

+65-6408 2000 skzheng@i2r.a-star.edu.sg

Haiguang Wang I2R hwang@i2r.a-star.edu.sg Wai Leong Yeow I2R wlyeow@i2r.a-star.edu.sg Zander Lei I2R leizd@i2r.a-star.edu.sg Jaya Shankar I2R jshankar@i2r.a-star.edu.sg Anh Tuan Hoang I2R athoang@i2r.a-star.edu.sg Joseph Teo Chee Ming I2R cmteo@i2r.a-star.edu.sg George Calcev Huawei Rolling Meadows,

IL USA George.Calcev@huawei.com

Osama Aboul Magd Huawei Osama.AboulMagd@huawei.com

Young Hoon Kwon Huawei Younghoon.Kwon@huawei.com

Betty Zhao Huawei Betty.Zhao@huawei.com

David Yangxun Huawei David.Yangxun@huawei.com

Bin Zhen Huawei ZhenBin@huawei.com

ChaoChun Wang MediaTek chaochun.wang@mediatek.com

James Wang MediaTek james.wang@mediatek.com

Jianhan Liu MediaTek jianhan.liu@mediatek.com

James Yee MediaTek james.yee@mediatek.com

Thomas Pare MediaTek thomas.pare@mediatek.com

Kiran Uln MediaTek kiran.uln@mediatek.com

Anna Pantelidou Renesas Mobile

Juho Pirskanen Renesas Mobile

Timo Koskela Renesas Mobile

George Vlantis STMicroelectronics

doc.: IEEE 802.11-13/1367r0

Submission Slide 4

CID 2004 for 11ah D1.0Nov 2013

Mingguang Xu, et. Al.

Hongyuan Zhang 336.23 24.3.17.4.3

TBD needs to be filled up

will bring proposal

Counter, propose TxEVM to be -4dB for MCS10, see document 11-xxxx-r0

doc.: IEEE 802.11-13/1367r0

Submission Slide 5

Introduction: Tx EVM• To ensure that the TX signal quality does not significantly limit the

overall link performance.• Tx EVM requirement for MCS-10 is currently not specified in [1].• The slopes of PER curves are consistent between different MCS’s.

– No fading, 1x1, 1 MHz, 256 bytes/packet, no impairments.

Nov 2013

Mingguang Xu, et. Al.

doc.: IEEE 802.11-13/1367r0

Submission Slide 6

“Criterions” for Setting Tx EVM Requirement

• Impact of Tx EVM to PER should be more or less consistent between MCS’s.– “Delta” between Tx EVM requirement and Rx sensitivity

requirement should be similar for all MCS’s.

• Performance degradation due to Tx constellation error at the EVM requirement point should be relatively small (e.g., <2 dB).

• There is no significant incremental performance improvement on PER beyond the Tx EVM requirement point.

Nov 2013

Mingguang Xu, et. Al.

doc.: IEEE 802.11-13/1367r0

Submission

Tx EVM Requirement for 11ah• Previously increased ~6 dB for every 4x in QAM order.• Propose -4 dB for BPSK ½ rep2 (MCS-10).

Nov 2013

Slide 7 Mingguang Xu, et. Al.

MCS bits/subcarrier Tx EVM(in dB)

SNR for 10% PER (in dB)

Difference, “Delta”

BPSK ½ rep2 0.25 -4 -2.4 -6.4

BPSK ½ 0.5 -5 0.0 -5.0

QPSK ½ 1 -10 3.0 -7.0

QPSK ¾ 1.5 -13 6.0 -7.0

16QAM ½ 2 -16 8.3 -7.7

16QAM ¾ 3 -19 12.4 -6.6

64QAM +2/3 4 -22 16.7 -5.3

64QAM ¾ 4.5 -25 18.1 -6.9

64QAM +5/6 5 -27 18.7 -8.3

256QAM ¾ 6 -30 23.5 -6.5

256QAM+5/6 6.7 -32 24.0 -8.0

6

6

6

5.7

5.3

5.4

Avg.-6.5

5 5.4

A B A+B

doc.: IEEE 802.11-13/1367r0

Submission Slide 8

PER v.s. Tx EVMNov 2013

Mingguang Xu, et. Al.

• The loss@EVM=-4 dB w.r.t. no constellation error is about 1.2 dB. • Starting from EVM=-4 dB, the PER performance improvement of

each 0.5 dB increment on Tx EVM is marginal (<0.2 dB).

doc.: IEEE 802.11-13/1367r0

Submission

Conclusions• We studied the Tx EVM requirement for MCS-10 in 802.11ah, and

suggested to specify it to be -4 dB.

Nov 2013

Mingguang Xu, et. Al.Slide 9

doc.: IEEE 802.11-13/1367r0

Submission

Editorial Instruction• TGah Editor: In Table 24-30 on Page 336, in the second row,

please fill up the “TBD” with “-4”.

Nov 2013

Mingguang Xu, et. Al.Slide 10

doc.: IEEE 802.11-13/1367r0

Submission

Straw Poll• Do you support to specify the Tx EVM requirement for MCS-10 in

802.11ah to be -4 dB as the editor’s instruction in Slide 10? – Yes– No– Abstain

Nov 2013

Mingguang Xu, et. Al.Slide 11

doc.: IEEE 802.11-13/1367r0

Submission

Appendix (1)• MCS-0: the specified requirement is -5 dB.• The loss w.r.t. no constellation error is about 1.6 dB, and the

marginal gain beyond EVM=-5 dB is less than 0.2 dB.

Nov 2013

Mingguang Xu, et. Al.Slide 12

doc.: IEEE 802.11-13/1367r0

Submission

Appendix (2)• MCS-1: the specified requirement is -10 dB.• The loss w.r.t. no constellation error is about 1.0 dB, and the

marginal gain beyond EVM=-10dB is less than 0.2 dB.

Nov 2013

Mingguang Xu, et. Al.Slide 13

doc.: IEEE 802.11-13/1367r0

Submission

References

[1] IEEE P802.11ah™/D1.0, October 2013.

Nov 2013

Mingguang Xu, et. Al.Slide 14