Modified pilot patterns for 8 data streams

IEEE 802.16 Presentation Submission Template (Rev. 9)Document Number: IEEE C80216m-09/1724Date Submitted: 2009-08-27Source:

Chung-Lien Ho, Yan-Xiu Zheng, Yu-Chuan Fang, E-mail: clho@itri.org.twChang-Lan Tsai, ITRI

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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)

Number of data streams Mt

Per stream power on data subcarriers

Per stream pilot power

Per stream pilot boosting level, dB

1 - 2

1/Mt

100.2 2 + 10*log10(Mt)

3 - 4 1 0 + 10*log10(Mt)

5 - 8 1 0 + 10*log10(Mt)

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 patterns36

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(a) (c)(b)

• Pilot boosting level– Based on Table X, per stream pilot booting level is

10*log10(Mt) = 6.9897, 7.7815, 8.4510, 9.0309 (dB) 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*log10(4) = 6.0206 dB

Modified pilot patterns for 8 data streams

• Pilot patterns36

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(a) (c)(b)

12

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• Pilot boosting level– Based on Table X, per stream pilot booting level is

10*log10(Mt) = 6.9897, 7.7815, 8.4510, 9.0309 (dB) 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 16m frame structure (10 MHz, 1024 subcarriers)

OFDM symbols/subframe 6

Permutation None (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) = 6.0206 dB for original patterns• 10*log10(8) = 9.0309 dB for modified patterns

MIMO scheme 8 x 8 spatial multiplexing (8-stream)

Channel coding scheme 16e CTC

Detection scheme Linear 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 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 P802.16m/D1, “DRAFT Amendment to IEEE Standard for Local and metropolitan area networks, Part 16: Air Interface for Broadband Wireless Access Systems,” July 2009.

[2] IEEE 802.16m-09/0034, “IEEE 802.16m System Description Document (SDD),” July 27, 2009.

[3] IEEE 802.16m-09/0010r2, “IEEE 802.16m Amendment Working Document (AWD),” June 1, 2009.

[4] IEEE C802.16m-09/1681, “Proposed Changes to DL Pilot Patterns Boosting Values (15.3.5.4.1) for the IEEE 802.16m/D1,”

Proposed Text

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

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(a) (c)(b)