Investigating Pilot Tone Allocations in IEEE 802.11-24 for Phase Tracking Optimization

may 2024 n.w
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Explore the impact of pilot structure and tone allocation on phase tracking performance in IEEE 802.11-24. Comparisons between clustered and distributed pilot tones are analyzed. The proposed hierarchical structure for Distributed Resource Units (DRUs) aims to ensure effective pilot tone distribution for improved performance.

  • Pilot Tone Allocation
  • Phase Tracking
  • IEEE 802.11-24
  • DRU
  • Performance Optimization
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  1. May 2024 doc.: IEEE 802.11-24/0769r0 On the Pilot Tone Allocations in DRU Date: 2024-05-06 Authors: Name Affiliations Address 1000 Sherbrooke West, Montr al, QC, H3A 3G4 Canada Phone email mahmoud.kamel@Interdigital .com Mahmoud Kamel Mrugen Deshmukh InterDigital Communication Inc 111 West 33rd Street New York, NY 10120 USA Ying Wang Hanqing Lou Rui Yang Submission Slide 1 Mahmoud Kamel, InterDigital

  2. May 2024 doc.: IEEE 802.11-24/0769r0 Abstract In this contribution, we investigate how the pilot structure and pilot tone allocation may impact the performance of phase tracking. In essence, we compare the PER performance of clustered vs distributed pilot tones. Submission Slide 2 Mahmoud Kamel, InterDigital

  3. May 2024 doc.: IEEE 802.11-24/0769r0 Background It was agreed that [1]: 11bn supports hierarchical pilot structure for DRU where pilot locations of a larger DRU is a subset of pilot locations of smaller component DRUs within the same PPDU BW The number of pilot tones for the same size DRU and RRU (regular RU) is the same Design methods to guarantee sufficiently distributed pilot tones in all DRUs were proposed in [2] High level criteria for the selection of pilot tones and a hierarchical pilot structure were proposed in [3] Throughout this contribution, the DRU notation xDRUy for a DRU of x-tones distributed over a y MHz distribution bandwidth will be used [4] Submission Slide 3 Mahmoud Kamel, InterDigital

  4. May 2024 doc.: IEEE 802.11-24/0769r0 Structure of Pilot Tones in RRU Recall that in Regular RU (RRU) the pilots are evenly distributed within the RRU bandwidth Pilot tones Submission Slide 4 Mahmoud Kamel, InterDigital

  5. May 2024 doc.: IEEE 802.11-24/0769r0 Structure of Pilot Tones in DRU The selection of pilot structure in DRU may result in the pilots being clustered or distributed. Clustered Pilots Distributed Pilots 106DRU20 106DRU20 Submission Slide 5 Mahmoud Kamel, InterDigital

  6. May 2024 doc.: IEEE 802.11-24/0769r0 Hierarchical Structure of DRUs Either Option 1 or Option 2 can be applied to form larger DRUs from smaller DRUs for any of the pilot designs in the next slides. Option 1 Option 2 Submission Slide 6 Mahmoud Kamel, InterDigital

  7. May 2024 doc.: IEEE 802.11-24/0769r0 Clustered Pilot Structure Distribution Bandwidth = 20 MHz By applying option 1 of the hierarchal structure in the previous slide, the larger DRUs (e.g., 52DRU20 or 106DRU20) will have its pilots clustered. 52DRU20_1 Submission Slide 7 Mahmoud Kamel, InterDigital

  8. May 2024 doc.: IEEE 802.11-24/0769r0 Clustered Pilot Structure Distribution Bandwidth = 40 MHz 52DRU20_1 Submission Slide 8 Mahmoud Kamel, InterDigital

  9. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 1 (Distribution Bandwidth = 20 MHz) [2] 52DRU20_1 Submission Slide 9 Mahmoud Kamel, InterDigital

  10. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 1 (Distribution Bandwidth = 40 MHz) 52DRU20_1 Submission Slide 10 Mahmoud Kamel, InterDigital

  11. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 2 ( Distribution Bandwidth = 20 MHz) [2] Submission Slide 11 Mahmoud Kamel, InterDigital

  12. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 2 ( Distribution Bandwidth = 40 MHz) Submission Slide 12 Mahmoud Kamel, InterDigital

  13. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 3 ( Distribution Bandwidth = 20 MHz) Submission Slide 13 Mahmoud Kamel, InterDigital

  14. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 3 ( Distribution Bandwidth = 40 MHz) Submission Slide 14 Mahmoud Kamel, InterDigital

  15. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 4 (Distribution Bandwidth = 20 MHz) Submission Slide 15 Mahmoud Kamel, InterDigital

  16. May 2024 doc.: IEEE 802.11-24/0769r0 Distributed Pilot Structure Design 4 (Distribution Bandwidth = 40 MHz) Submission Slide 16 Mahmoud Kamel, InterDigital

  17. May 2024 doc.: IEEE 802.11-24/0769r0 Simulation Environment Simulation Parameters Channel Bandwidth = 20 MHz / 40 MHz LDPC Coding, MCS = 0, 3, 7, 9 SISO with Channel Model D SNR is defined as the average SNR per user. Packet Size = 100 bytes Pilot Positions: Pilot Design Clustered Design 1 Design 2 Design 3 Design 4 DRU Index -65, -64, 59, 60 -94, -34, 31, 91 -103, -52, 22, 73 -87, -30, 38, 95 -103, -23, 22, 102 106DRU20_1 -60, -59, 64, 65 -91, -31, 34, 94 -73, -22, 52, 103 -95, -38, 30, 87 -102, -22, 23, 103 106DRU20_2 -151, -144, 115, 122 -187, -72, 60, 175 -207, -108, 40, 139 -180, -59, 67, 188 -207, -50, 40, 197 106DRU40_1 -150, -143, 116, 123 -186, -71, 61, 176 -186, -89, 61, 158 -199, -76, 48, 171 -206, -49, 41, 198 106DRU40_2 -142, -134, 124, 131 -185, -70, 62, 177 -167, -70, 80, 177 -171, -48, 76., 99 -198, -41, 49, 206 106DRU40_3 -141, -133, 125, 132 -184, -69, 63,178 -148, -49, 99, 198 -188, -67, 59,180 -197, -40, 50, 207 106DRU40_4 The average PER is considered Option 1 in slide 6 is applied for the clustered pilot design and option 2 is applied for the distributed pilot designs Submission Slide 17 Mahmoud Kamel, InterDigital

  18. May 2024 doc.: IEEE 802.11-24/0769r0 Distribution Bandwidth = 20 MHz All distributed pilot designs perform the same, slightly better than the clustered pilot design. The performance of the distributed pilot designs approaches that of the clustered pilot design as the MCS gets higher. Submission Slide 18 Mahmoud Kamel, InterDigital

  19. May 2024 doc.: IEEE 802.11-24/0769r0 Distribution Bandwidth = 20 MHz The performance of the distributed pilot designs becomes similar to the clustered pilot design at higher MCSs. Submission Slide 19 Mahmoud Kamel, InterDigital

  20. May 2024 doc.: IEEE 802.11-24/0769r0 Distribution Bandwidth = 40 MHz Similar behavior for larger distribution bandwidths. Submission Slide 20 Mahmoud Kamel, InterDigital

  21. May 2024 doc.: IEEE 802.11-24/0769r0 Distribution Bandwidth = 40 MHz , with a slight difference between the performance of the distributed and clustered pilot designs at high MCS. Submission Slide 21 Mahmoud Kamel, InterDigital

  22. May 2024 doc.: IEEE 802.11-24/0769r0 Conclusions The PER performance of different designs for pilot structure is compared All distributed pilot designs (regardless of the specifics of the design) perform the same Distributed pilot designs perform slightly better than clustered pilot design. The performance is better for lower MCSs and larger distribution bandwidths In terms of complexity, the discussed designs in this contribution are fairly similar. A criteria to distinguish the best pilot design is required. Other methods to combine smaller DRUs to form larger DRUs may be also recommended[4]. Submission Slide 22 Mahmoud Kamel, InterDigital

  23. May 2024 doc.: IEEE 802.11-24/0769r0 References [1] 11-24/0209r1, Specification Framework for TGbn [2] 11-24/0402r1, 20 MHz Tone Plan and Pilot Design for DRU [3] 11-24/0501r2, Pilot design considerations for dRU [4] 11-24/0520r1, Discussion on DRU Submission Slide 23 Mahmoud Kamel, InterDigital

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