Modified pilot patterns for 8 data streams IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE C80216m-09/1724 Date Submitted: Source: Chung-Lien Ho, Yan-Xiu Zheng, Yu-Chuan Fang, Chang-Lan Tsai, ITRI * Venue: IEEE Session #63, Jeju, Korea Re: IEEE m-09/0037, “Call for Contributions on Project m Amendment Content” Base Contribution: N/A Purpose: To be discussed and adopted by TGm for the IEEE P802.16m/D1 Draft. 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.

Introduction Pilot patterns for 8 data streams in [1]-[3] are designed without considering pilot boosting issue Suggested DL power settings for data and pilot subcarriers (harmonized with some companies through discussion) Number of data streams M t Per stream power on data subcarriers Per stream pilot power Per stream pilot boosting level, dB /M t *log10(M t ) *log10(M t ) *log10(M t ) Table X: DL power settings for data and pilot subcarriers for different number of data streams [4]

Original pilot patterns for 8 data streams Pilot patterns

Pilot boosting level –Based on Table X, per stream pilot booting level is 10*log10(M t ) = , , , (dB) for M t = 5, 6, 7, 8 This may cause OFDM symbol-by-symbol power fluctuation OFDM symbol-by-symbol power fluctuation can be avoided only when M t = 8 and pilot booting level = 10*log10(4) = dB

Modified pilot patterns for 8 data streams Pilot patterns

Pilot boosting level –Based on Table X, per stream pilot booting level is 10*log10(M t ) = , , , (dB) for M t = 5, 6, 7, 8 No OFDM symbol-by-symbol power fluctuation for M t = 5, 6, 7, 8

Performance Results Simulation parameters ParameterValue Frame Structure16m frame structure (10 MHz, 1024 subcarriers) OFDM symbols/subframe6 PermutationNone (CRU) Channel model [16m EMD] Ped-B with 3 km/h Veh-A with 30 km/h Channel estimation (CE) 2D-MMSE (CE over 2 CRUs or 4 CRUs), delay spread perfectly known but actual power delay profile unknown Power boosting for level 10*log10(4) = dB for original patterns 10*log10(8) = dB for modified patterns MIMO scheme8 x 8 spatial multiplexing (8-stream) Channel coding scheme16e CTC Detection schemeLinear MMSE MCS Set [1] QPSK-101/256, QPSK-171/256, 16QAM-128/256, 64QAM-135/256, 64QAM-181/256, 64QAM-225/256, 64QAM-237/256 Number of CRUs2 CRUs or 4 CRUs with rate matching

Simulation results –Ped-B 3 km/h, CE over 2 CRUs

–Ped-B 3 km/h, CE over 4 CRUs

–Veh-A 30 km/h, CE over 2 CRUs

–Veh-A 30 km/h, CE over 4 CRUs

References [1]IEEE P802.16m/D1, “DRAFT Amendment to IEEE Standard for Local and metropolitan area networks, Part 16: Air Interface for Broadband Wireless Access Systems,” July [2]IEEE m-09/0034, “IEEE m System Description Document (SDD),” July 27, [3]IEEE m-09/0010r2, “IEEE m Amendment Working Document (AWD),” June 1, [4]IEEE C802.16m-09/1681, “Proposed Changes to DL Pilot Patterns Boosting Values ( ) for the IEEE m/D1,”

Proposed Text Replace Figures 422 in [1], 47 in [2] and 462 in [3] by following figures