Modified pilot patterns for 8 data streams IEEE

Modified pilot patterns for 8 data streams IEEE 802. 16 Presentation Submission Template (Rev. 9) Document Number: IEEE C 80216 m-09/1724 Date Submitted: 2009 -08 -27 Source: Chung-Lien Ho, Yan-Xiu Zheng, Yu-Chuan Fang, Chang-Lan Tsai, ITRI E-mail: clho@itri. org. tw *<http: //standards. ieee. org/faqs/affiliation. FAQ. html> Venue: IEEE Session #63, Jeju, Korea Re: IEEE 802. 16 m-09/0037, “Call for Contributions on Project 802. 16 m Amendment Content” Base Contribution: N/A Purpose: To be discussed and adopted by TGm for the IEEE P 802. 16 m/D 1 Draft. Notice: This document does not represent the agreed views of the IEEE 802. 16 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 802. 16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.

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 email discussion) Table X: DL power settings for data and pilot subcarriers for different number of data streams [4] Number of data streams Mt Per stream power on data subcarriers 1 -2 3 -4 5 -8 1/Mt Per stream pilot power Per stream pilot boosting level, d. B 100. 2 2 + 10*log 10(Mt) 1 0 + 10*log 10(Mt)

Original pilot patterns for 8 data streams • Pilot patterns

• Pilot boosting level – Based on Table X, per stream pilot booting level is 10*log 10(Mt) = 6. 9897, 7. 7815, 8. 4510, 9. 0309 (d. B) for Mt = 5, 6, 7, 8 • This may cause OFDM symbol-by-symbol power fluctuation • OFDM symbol-by-symbol power fluctuation can be avoided only when Mt = 8 and pilot booting level = 10*log 10(4) = 6. 0206 d. B

Modified pilot patterns for 8 data streams • Pilot patterns 1 5 2 6 5 1 6 2 3 7 4 8 7 3 8 4

• Pilot boosting level – Based on Table X, per stream pilot booting level is 10*log 10(Mt) = 6. 9897, 7. 7815, 8. 4510, 9. 0309 (d. B) for Mt = 5, 6, 7, 8 • No OFDM symbol-by-symbol power fluctuation for Mt = 5, 6, 7, 8

Performance Results • Simulation parameters Parameter Value Frame Structure 16 m frame structure (10 MHz, 1024 subcarriers) OFDM symbols/subframe 6 Permutation None (CRU) Channel model [16 m EMD] • Ped-B with 3 km/h • Veh-A with 30 km/h Channel estimation (CE) 2 D-MMSE (CE over 2 CRUs or 4 CRUs), delay spread perfectly known but actual power delay profile unknown Power boosting for level • 10*log 10(4) = 6. 0206 d. B for original patterns • 10*log 10(8) = 9. 0309 d. B for modified patterns MIMO scheme 8 x 8 spatial multiplexing (8 -stream) Channel coding scheme 16 e CTC Detection scheme Linear MMSE MCS Set [1] QPSK-101/256, QPSK-171/256, 16 QAM-128/256, 64 QAM-135/256, 64 QAM-181/256, 64 QAM-225/256 , 64 QAM-237/256 Number of CRUs 2 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 P 802. 16 m/D 1, “DRAFT Amendment to IEEE Standard for Local and metropolitan area networks, Part 16: Air Interface for Broadband Wireless Access Systems, ” July 2009. [2] IEEE 802. 16 m-09/0034, “IEEE 802. 16 m System Description Document (SDD), ” July 27, 2009. [3] IEEE 802. 16 m-09/0010 r 2, “IEEE 802. 16 m Amendment Working Document (AWD), ” June 1, 2009. [4] IEEE C 802. 16 m-09/1681, “Proposed Changes to DL Pilot Patterns Boosting Values (15. 3. 5. 4. 1) for the IEEE 802. 16 m/D 1, ”

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