Doc.: IEEE 802.11-13/1367r0 Submission Nov 2013 Mingguang Xu, et. Al.Slide 1 Tx EVM for MCS-10 in 802.11ah Date: 2013-11-10 Authors:

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Tx EVM for MCS-10 in ah Date: Authors: Nov 2013

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doc.: IEEE /1367r0 Submission Nov 2013 Mingguang Xu, et. Al.Slide 1 Tx EVM for MCS-10 in ah Date: Authors:

doc.: IEEE /1367r0 Submission Nov 2013 Mingguang Xu, et. Al.Slide 2

doc.: IEEE /1367r0 Submission Nov 2013 Mingguang Xu, et. Al.Slide 3

doc.: IEEE /1367r0 SubmissionSlide 4 CID 2004 for 11ah D1.0 Nov 2013 Mingguang Xu, et. Al. Hongyuan Zhang TBD needs to be filled up will bring proposal Counter, propose TxEVM to be -4dB for MCS10, see document 11-xxxx- r0

doc.: IEEE /1367r0 SubmissionSlide 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 /1367r0 SubmissionSlide 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 /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 7Mingguang Xu, et. Al. MCSbits/subcarrierTx EVM (in dB) SNR for 10% PER (in dB) Difference, “Delta” BPSK ½ rep BPSK ½ QPSK ½ QPSK ¾ QAM ½ QAM ¾ QAM +2/ QAM ¾ QAM +5/ QAM ¾ QAM+5/ Avg A B A+B

doc.: IEEE /1367r0 SubmissionSlide 8 PER v.s. Tx EVM Nov 2013 Mingguang Xu, et. Al. The 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 /1367r0 Submission Conclusions We studied the Tx EVM requirement for MCS-10 in ah, and suggested to specify it to be -4 dB. Nov 2013 Mingguang Xu, et. Al.Slide 9

doc.: IEEE /1367r0 Submission Editorial Instruction TGah Editor: In Table on Page 336, in the second row, please fill up the “TBD” with “-4”. Nov 2013 Mingguang Xu, et. Al.Slide 10

doc.: IEEE /1367r0 Submission Straw Poll Do you support to specify the Tx EVM requirement for MCS-10 in ah 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 /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 /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 /1367r0 Submission References [1] IEEE P802.11ah™/D1.0, October Nov 2013 Mingguang Xu, et. Al.Slide 14