Cumulative impact of multiple impairments on JT performance

Septemb er 2019 doc.: IEEE 802.11-19/1597r0 Cumulative impact of multiple impairments on JT performance Date: 2019-09-15 Authors: Name Affiliations Ron Porat Broadcom Srinath Puducheri Broadcom Submission Address Phone email [email protected]

Slide 1 Ron Porat (Broadcom) Septemb er 2019 doc.: IEEE 802.11-19/1597r0 Abstract In this contribution we update the our JT results from [1] (simulation configuration r1) to include the impact of additional impairments Submission Slide 2 Ron Porat (Broadcom) Septemb er 2019 doc.: IEEE 802.11-19/1597r0 Impairments (1)

Relative phase offset (deg) of slave AP w.r.t master during joint TX: Models phase drift due to residual CFO: this is a worst case assumption since phase drift typically builds up over time (i.e., not static). We consider phase drifts of and degrees, arising from a residual CFO of 10Hz over 1.1 and 2.2 ms respectively. Relative timing offset (s) of slave AP w.r.t master during joint TX: Models variation in relative TX timing of slave AP w.r.t master AP between sounding and joint data TX We assume ns based on our simulation results (14.4 degrees across the entire BW). TX gain offset (dB): dB difference in relative TX power of slave APs w.r.t master AP between sounding and joint data TX (also modeled in [2]). We assume = 0.5dB Magnitude of phase, timing and TX gain offsets assumed to be same across slave APs. However, signs are chosen independently per slave AP. Further, signs for each parameter are picked

independent of the others. Submission Slide 3 Ron Porat (Broadcom) Septemb er 2019 doc.: IEEE 802.11-19/1597r0 Impairments (2) STA channel drift with common-phase tracking on pilots: Phase drift (of slave APs relative to master) during joint TX, results in the channel seen by STA during payload changing versus the initial estimate (from preamble) as explained in [3]. Modeled as static channel error at STA (worst-case assumption), with common phase estimation and removal done using pilots. Joint NDP [4] channel estimation error: SNR for NDP assumed to be same as for joint TX; no channel-smoothing assumed.

Tx EVM on master and slave APs: assumed at a level needed for 256QAM Submission Slide 4 Ron Porat (Broadcom) Septemb er 2019 doc.: IEEE 802.11-19/1597r0 Other Assumptions as in [1] Channel: 11nD, 80MHz, -30dBc channel aging Baseline : TDMA across different BSS, each with AP =4 ant., STA = [2 2] ant., Nss = [2 1], DL MUMIMO per BSS Path-loss matrix (common to baseline and JT): each STA sees 0dB from own-BSS AP and X dB from remaining APs; X = 10, 20dB Joint TX (JT):

AP-STA SNR in all plots (x-axis) refers to own-BSS SNR Per-AP tx power = 1.0; 2AP: AP = [4 4] ant., STA = [2 2 2 2] ant., Nss = [2 1 2 1] Total tx power boosted by 3dB 4AP: AP = [4 4 4 4] ant., STA = [2 2 2 2 2 2 2 2] ant., Nss = [2 1 2 1 2 1 2 1] Total tx power boosted by 6dB Metrics: Submission Ideal gain: Gain of ideal JT over ideal baseline (i.e., no impairments for either) Impaired gain: Gain of JT with specified impairments over baseline. Channel aging present for both cases Slide 5 Ron Porat (Broadcom)

Septemb er 2019 doc.: IEEE 802.11-19/1597r0 Simulation results: 2AP Submission Slide 6 Ron Porat (Broadcom) Septemb er 2019 doc.: IEEE 802.11-19/1597r0 Simulation results: 4AP Submission Slide 7 Ron Porat (Broadcom) Septemb er 2019

doc.: IEEE 802.11-19/1597r0 Conclusions As observed in [1], X=20 is insensitive to phase/timing impairments. Gains are: X=10 shows an impact of 8d on performance. Gains @ 30dB SNR: 2AP: 1.9 4AP: 3.5 2AP: 1.85 for 4d, 1.75 for 8d 4AP: 3.15 for 4d, 2.6 for 8d Overall even with higher phase drift and all other impairments included substantial gains with JT are still possible. Submission

Slide 8 Ron Porat (Broadcom) Septemb er 2019 doc.: IEEE 802.11-19/1597r0 References 1. 2. 3. 4. Comparison of CBF and JT, IEEE 802.11-19/0799 Joint Transmissions: Backhaul and Gain State Issues, IEEE 802.11-19/1089 Joint Beamforming Simulations, IEEE 802.11-19/1094 Joint Sounding for Multi-AP Systems IEEE 802.11-19/1593 Submission Slide 9 Ron Porat (Broadcom)

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