Considerations on Simulation Assumptions on DL pilot patterns

Considerations on Simulation Assumptions on DL pilot patterns Document Number: IEEE C 802. 16 m-08/496 Date Submitted: 05 -10 -2008 Source: Zhang Lianbo Qu Hongyun Fang Huiying Xu Ling zhang. lianbo@zte. com. cn qu. hongyun@zte. com. cn fang. huiying@zte. com. cn xu. ling@zte. com. cn ZTE Corp. Venue: IEEE Session #55, Macau. Base Contributions: None Purpose: Call for Contributions on Project 802. 16 m System Description Document (SDD): DL Pilot Structures 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 >. 1

Introduction • Purpose: – The power constrain should be considered, when the performance of DL dedicated pilot pattern is evaluated. 2

Power Constraint(1) • For simulation comparison, the most important thing is that transmission power should keep the same for each DL pilot pattern. Assume average power is 1 for each sub-carrier in RB, then the average SNR(ASNR) is ( is noise power). • Assume that in one symbol of RB, the number of pilot subcarrier and data subcarrier is a and b, respectively, the power constraint is, a. PP+b. PD≤NFS (1) Where PP is pilot sub-carrier power, and PD is data sub-carrier power, NFS is the sub-carrier number of RB. 3

Power Constraint(2) l l For the symbol of RB has not pilot, then the power constraint for the data sub-carrier is, NFS PD≤NFS (2) Define pilot boosting is, R =PP/PD (3) Generally, R≥ 1. 4

Power Constraint(3) • Here is an example to show the consideration of power constraint. • Assume average power is 1 for each sub-carrier , so the power constraint for symbol #0, #5 of RB is as follows, 18 PD≤ 18 • Power constraint for symbol #1, #4 of RB is, 12 PD＋3 PP≤ 18 • Power constraint for symbol #2, #3 of RB is, 14 PD＋4 PP≤ 18 • To efficiently use the power and with the condition of R≥ 1, PD =18/(14+4 R)，PP =18 R/(14+4 R). if R<1, PD =1, PP=R。 5

Pilot Patterns Examples in this Contribution Affiliation Contribution Intel C 802. 16 m-08/121 r 1 Motorola C 802. 16 m-08/123 LGE C 802. 16 m-08/153 Media. Tek C 802. 16 m-08/139 r 2 Samsung C 802. 16 m-08/188 r 2 6

Power Constraint Example Pilot pattern for 2 streams Intel Power Constraint if R≥ 1, PD =18/(16+R)，PP =18 R/(16+R). Motorola if R≥ 2, PD =18/(12+3 R)，PP =18 R/(12+3 R). if 1≤R<2, PD =1, PP=R. LGE if R≥ 2, PD =18/(12+3 R)，PP =18 R/(12+3 R). if 1≤R<2, PD =1, PP=R. Media. Tek if R≥ 1, PD =18/(15+3 R)，PP =18 R/(15+3 R). Samsung if R≥ 1, PD =18/(16+R)，PP =18 R/(16+R). 7

The Effect on Boosting Considering Power Constraint • As the above curve shows, pilot patterns of Intel and Samsung have the more potential to 8 boost the pilot power

Suggested Text Proposal • 11. 5. 3. 2 Dedicated Pilot Structure • To add the following simulation assumption when to compare the performance of DL pilot patterns. – 8. To use the best pilot boosting value while the transmission power is limited in one resource block. 9