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1024 QAM Proposal

1024 QAM Proposal. Date: 2015-09-14. Authors:. Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Authors (continued). Introduction. This contribution proposes to use 1024 QAM in 11ax

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1024 QAM Proposal

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  1. 1024 QAM Proposal Date: 2015-09-14 Authors: Eunsung Park, LG Electronics

  2. Authors (continued) Eunsung Park, LG Electronics

  3. Authors (continued) Eunsung Park, LG Electronics

  4. Authors (continued) Eunsung Park, LG Electronics

  5. Authors (continued) Eunsung Park, LG Electronics

  6. Authors (continued) Eunsung Park, LG Electronics

  7. Authors (continued) Eunsung Park, LG Electronics

  8. Authors (continued) Eunsung Park, LG Electronics

  9. Introduction • This contribution proposes to use 1024 QAM in 11ax • First part talks about the importance of peak throughput enhancement of 11ax for marketing point of view • Second part provides system level simulations to show average throughput enhancement by 1024QAM • Finally, we discuss feasibility of 1024QAM and propose to use it optionally in 11ax Eunsung Park, LG Electronics

  10. How to appeal 11ax in the market? • We hope 11ax becomes a big success in market • But, ‘average throughput enhancement of 4X’ may not be so appealing to market even if it is very important technically. • 1024 QAM provides a good marketing point on 11ax based on the followings: • WLAN finally achieves 10Gbps (Multi-gigabit)! • New frame structure provides around 15% enhancement of peak throughput (4X FFT with 0.4us CP, More guard/pilot tones used as data) • 1024 QAM provides additional 25% gain, which results in overall 44% gain (6.933Gbps * 1.44 = 9.98Gbps!) • The first wireless technology to use 1K QAM1) • Keep superior to other standards in terms of modulation technology (LTE decided to use 256QAM) Eunsung Park, LG Electronics

  11. How to meet the technical target of 11ax? • Based on our system-level simulation, we have the following observations. • Simulation parameters are described in Appendix A • Observation 1. In most indoor scenarios, 1024 QAM MCS levels are selected with very high probability (see page 5) • We additionally used MCS 10 (1024QAM with 3/4 code rate) and MCS 11 ( 1024QAM with 5/6 code rate) • Observation 2. 1024 QAM provides average throughput gain over 20% in most indoor scenarios (see page 6) Eunsung Park, LG Electronics

  12. MCS Selection Probability with 1024QAM • We simulated SISO, space time block code (STBC), and spatial multiplexing (SM) in each simulation scenario [2] Indoor hotspot Outdoor Residential Enterprise SISO STBC SM Eunsung Park, LG Electronics

  13. Average Throughput Gain with 1024QAM • Average Throughput Gain by including 1024 QAM [Unit : %] Eunsung Park, LG Electronics

  14. Discussion on Feasibility (1/2) • For 1024 QAM application, we need to discuss several issues such as • Required minimum EVM • Non-linearity of power amplifier (PA) • Quantization error of analog-to-digital converter (ADC) • Phase noise and I/Q imbalance of local oscillator (LO) • Residual CFO effect • Constellation design, interleaver design, etc Eunsung Park, LG Electronics

  15. Discussion on Feasibility (2/2) • EVM of -35dBc or even -34dBc give reasonable performance (See Appendix B) • Note that even in 802.11ac MU-MIMO the AP already has to improve its Tx EVM level to about -38dBc, so 1024 QAM should not impose a real new requirement • Assuming future modems will include sophisticated algorithms that will combat Tx EVM sources (phase noise, PA nonlinearities, IQ imbalance), the Tx EVM requirement can be further relieved • Current ADC technology seems to make 1024 QAM feasible • ADC needs 12 bits for quantization at least when using 1024 QAM and it is already possible to implement • CFO may not cause any problem with a proper pilot design • Although a high modulation level such as 1024 QAM is vulnerable to CFO, properly designed pilot can reliably estimate and compensate residual CFO Eunsung Park, LG Electronics

  16. Conclusion • We have showed that using 1024 QAM in 11ax can be appeal to the market and also help to guarantee the technical target of 11ax • by providing peak data rate increase and average throughput enhancement • Also, we have checked the feasibility of 1024 QAM and the current technology seems feasible • Thus, we propose to use 1024 QAM in 11ax Eunsung Park, LG Electronics

  17. Straw poll 1 • Do you agree to use 1024 QAM as an optional feature for SU and MU using resource units equal to or larger than 242 tones in 11ax? • Y/N/A Eunsung Park, LG Electronics

  18. References [1] IEEE 802.11-14/0624r0 - Investigation on 1024 QAM Feasibility in 11ax [2] IEEE 802.11-14/0980r14 - Simulation Scenarios Eunsung Park, LG Electronics

  19. Appendices Eunsung Park, LG Electronics

  20. A. Simulation Parameters Eunsung Park, LG Electronics

  21. B. Effect of TX EVM on RX performance • 4 Tx 2 Rx MIMO 2 streams, 1024 QAM rate 5/6, no channel estimation loss, beamforming SVD, ZF equalizer Eunsung Park, LG Electronics

  22. C. Link Curve • MCS 11 requires about 32dB SNR for PER of 10%. No CFO, no TO channel estimation w/ LS Eunsung Park, LG Electronics

  23. Back up Eunsung Park, LG Electronics

  24. Simulation Results • Channel D, corr=0.7, 4 Tx antennas, 2 Rx antennas Eunsung Park, LG Electronics

  25. Simulation Results • Channel D, corr=0.7, 4 Tx antennas, 2 Rx antennas • EVM = 35 (1024 QAM), 32 (256 QAM) Eunsung Park, LG Electronics

  26. Simulation Results • Channel D, corr=0.3, 4 Tx antennas, 2 Rx antennas Eunsung Park, LG Electronics

  27. Simulation Results • Channel D, corr=0.3, 4 Tx antennas, 2 Rx antennas • EVM = 35 (1024 QAM), 32 (256 QAM) Eunsung Park, LG Electronics

  28. Simulation Results • Channel D, corr=0.7, 3 Tx antennas, 2 Rx antennas Eunsung Park, LG Electronics

  29. Simulation Results • Channel D, corr=0.7, 3 Tx antennas, 2 Rx antennas • EVM = 35 (1024 QAM), 32 (256 QAM) Eunsung Park, LG Electronics

  30. Simulation Results • Channel D, corr=0.3, 3 Tx antennas, 2 Rx antennas Eunsung Park, LG Electronics

  31. Simulation Results • Channel D, corr=0.3, 3 Tx antennas, 2 Rx antennas • EVM = 35 (1024 QAM), 32 (256 QAM) Eunsung Park, LG Electronics

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