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1024 QAM Proposal

Learn how implementing 1024 QAM modulation in 11ax boosts data rates by 44% and improves average throughput by 20% in indoor scenarios. Explore the feasibility and benefits of this advanced technology.

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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

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  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 • Do you agree to add the following text to the 11ax SFD: • 1024 QAM is used as an optional feature for SU and MU using resource units equal to or larger than 242 tones in 11ax? 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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