Uplink 6x6 Pilot Pattern Comparison Document Number: IEEE C802.16m-08/1036r2 Date Submitted: Source: Chih-Yuan Lin

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Presentation transcript:

Uplink 6x6 Pilot Pattern Comparison Document Number: IEEE C802.16m-08/1036r2 Date Submitted: Source: Chih-Yuan Lin Pei-Kai Liao ), Yu-Hao Chang Ciou-Ping Wu and Paul Cheng MediaTek Inc. No.1, Dusing Road 1, Science-Based Industrial Park, Hsinchu, Taiwan 300, R.O.C. Pangan Ding, Richard Li ITRI Re: PHY: SDD Session 56 Cleanup; in response to the TGm Call for Contributions and Comments m-08/033 for Session 57. Purpose: Propose to be discussed and adopted by TGm for the use in Project m SDD Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

Simulation Parameters (1/2) 2-by-2 spatial multiplexing MIMO MMSE detector for recovering data 2-D MMSE channel estimator –Channel delay spread matches 5 us –Doppler frequency matches mobile speed 100 km/hr 4 MCS levels –QPSK ½, QPSK ¾,16QAM ½, 16QAM ¾

Simulation Parameters (2/2) Pilot power boosting: 5 dB

Simulation Results (1/7) Synchronization error scenario –Each subframe is divided into two groups of tiles Each group has a random frequency offset (between 0.02 subcarrier spacing and  0.02 subcarrier spacing)

PB 3 km/hr (throughput) Simulation Results (2/7)

VA 120 km/hr (throughput) Simulation Results (3/7)

Simulation Results (4/7) All pilot patterns have reasonably good performances Intel, Mediatek, and LG perform closely and are among the best In the following, we further compare PER performances of the three companies under large channel delay spread

Simulation Results (5/7) PB channel model with 3 km/hr speed (16QAM ¾ ) Three companies have quite similar performances –At high SNR region, Mediatek/LG have slightly better performance Coherent bandwidth of PB channel model is about 4~5 subcarriers –In frequency direction, one- subcarrier flipping in pilot pattern is impossible to lead to a large performance gap since channels between two adjacent subcarriers are highly similar

Simulation Results (6/7) “VA long” channel model with 30 km/hr speed (16QAM ½ ) –“VA long” has 10 us delay spread –Three companies also have similar performances

Simulation Results (7/7) ITRI’s simulation results –PB channel model, 3 km/hr, and 64QAM ½ Intel

Summary (1/2) Simulation summary –Low mobility case From PER simulation, Mediatek, LG, Intel perform quite similarly in low to medium SNR region Mediatek and LG perform relatively better in high SNR region because in high SNR region synchronization error would dominate performance –High mobility case Mediatek, Intel, and LG performs similarly but Intel has slightly better performance –In SRD document, system performance should be optimized in low-mobility case and thus synchronization error should be taken into consideration

Summary (2/2) Conclusion –Mediatek’s pilot pattern is recommended as UL pilot pattern for DRU

Text Proposal (1/2) Pilot Structure For 6-by-6 UL tile, the UL pilot pattern for DRU is shown in Figure x. Figure x. UL DRU tile structure.

Text Proposal (2/2) For irregular subframe, Figures Y and Z are used for 1 and 2 data streams UL DRU. Figure Y. UL DRU tile structure for five-symbol subframe. Figure Z. UL DRU tile structure for seven-symbol subframe..

Appendix (1/2) Companies’ proposals

Appendix (2/2) Companies’ proposals (continued)