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Design and Cross Evaluation results for the IEEE 802.16m UL Primary Fast Feedback Channels

Document Number: C802.16m-09/0729Date Submitted: 2009-03-09Source: Hongmei Sun, Qinghua Li, Jong-Kae (JK) Fwu, Email: {hongmei.sun, changlong.xu, jong-kae.fwu }@ intel.com Changlong Xu, Eddie Lin, Yuan Zhu, Hujun Yin, Roshni Srinivasan, Rath Vannithamby, Sassan Ahmadi Intel Corporation Re: Call for Comments on Amendment Working Document, IEEE 802.16m-09/0012 Target topic: UL PHY ControlBase Contribution:

N/A

Purpose: To be discussed and adopted by TGm for use in 802.16m AWD

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/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

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Contributions on Fast Feedback Channel Design

LGE C80216m-09_0289.doc

ITRI C80216m-09_0225.doc

Nortel C80216m-09_0294r2.doc

Samsung C80216m-09_0346r2.pdf

[20090305]P-FBCH(Samsung).pptx

Intel C80216m-09_0125.ppt

C80216m-09_0198.doc

Other source: C80216m-UL_Control_DG_AWD_v7r2.doc or updated version

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Outline

• Intel’s PFBCH design• Sequence Orthogonal Property Comparison @PFBCH• Comparison on Methods proposed to better performance of

PFBCH@VA350• PFBCH Design Cross Evaluation Results using evaluation criteria

agreed upon in UL PHY Control RG– Samsung, Nortel, LG, ITRI, Intel

• Summary

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Intel’s PFBCH design

• Information Content– 4~6 bits payload

• Wideband CQI, RI, BW indicator, etc.

• Multiplexing:– PFBCH is FDM-ed with UL data and other control channels– Multiple users are FDM/TDM-ed within PCQICH

• PHY Structure– FMT (Feedback Mini-Tile, Nsub x Nsym): 2x6

– Each logical PCQICH occupies 3 FMTs– Each PRU (18x6) can accommodate 3 PCQICH– Coding: binary semi-orthogonal sequence with BPSK, w. repetition 3

• Support payload bits up to 6• cross-correlation distance: 0, 4

• Non-coherent detection

6 OFDM sysmbols2 subcarries

Tile structure of 2x6 (PCQICH)

Intel_PFBCH_Sequces

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PFBCH: Sequence Orthogonal Property Comparison　 Number of different correlation distance (information bits = 4) sum

Number of correlations = 0

Number of correlations = 2

Number of correlations = 4

Number of correlations = 6

Samsung^ 96 0 24 0 120LGe 48 64 8 0　 120ITRI 23 31 49 17 120Nortel 96 0 24 0 120Intel 96 0 24 0 120　 Number of different correlation distance (information bits = 5) sum

Number of correlations = 0

Number of correlations = 2

Number of correlations = 4

Number of correlations = 6

Samsung^ 256 0 240 0 496LGe 128 224 112 32 496ITRI 89 179 176 52 496Nortel 256 0 240 0 496Intel 256 0 240 0 496　 Number of different correlation distance (information bits = 6) Sum

Number of correlations = 0

Number of correlations = 2

Number of correlations = 4

Number of correlations = 6

Samsung^ 768 0 1248 0 2016LGe 512 768 480 256 2016ITRI 434 726 679 177 2016Nortel 768 0 1248 0 2016Intel 768 0 1248 0 2016

• Sequence Orthogonal Property:– Max. Correlation distance<=4: Samsung, Nortel, Intel

– 6bits: Samsung^, Nortel, Intel are among the best

– 4 & 5bits: Samsung^, Nortel, Intel are among the best

• Overall: Samsung^, Nortel, Intel are among the best

Samsung^: Latest coding sequence from Hwasun on March 5

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PFBCH: Methods proposed to better performance@VA350

• Permutation (LG,09/0289)

• Subcarrier Shifting (Samsung, 09/0346r2)– The subcarrier modulation sequence of primary FFBCH is cyclic-shifted by 4 and mapped to 3

UL FMTs

• Sequence Mapping (Intel, 09/0125)– Map each message to a group of codewords or code sequences and put each of the

codewords to one FMT of the logical PCQICH channel Ex, 6bits information, code sequence index of each FMT can be 1) 1st FMT: 2) 2nd FMT: 3) 3rd FMT:

• Low pass filter based receiver (Intel, 09/0125)Note: All performances results are evaluated using “Freq First” order when mapping each coding sequence to FMT

c0 c1 c2 c3 c4 c5

c6 c7 c8 c9 c10 c11

time

f

Frequency First

S0 S2 S4 S6 S8 S10

S1 S3 S5 S7 S9 S11

S9 S11 S4 S0 S2 S7

S10 S3 S5 S1 S6 S8

S3 S5 S7 S9 S11 S1

S4 S6 S8 S10 S0 S2

OFDM Symbol

Fre

quen

cy

)64,...,3,2,1(),64,21mod(1 jja j

]64,...,3,2,1[0 Idx],,,[ 1

6413

12

111 aaaaIdx

],,,[ 264

23

22

212 aaaaIdx )64,...,3,2,1(),64,42mod(2 jja j

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PFBCH: Methods proposed to better performance@VA350 (cont.)

• Sequence Mapping vs. Permutation vs. Subcarrier shifting (w. Intel’s PFBCH sequences)– PER=0.1: performance similar– PER=0.01: permutation is lightly better than the rest

• Overall: – Above mentioned three methods are good candidates to better performance@VA350– Should be used for enhanced basic receiver– Low pass filter can be used for advanced receiver

4 5 6 7 8 9 10 11 12 13 14

10-2

10-1

100 PCQICH-VA350-1x2-Intel-PCQICH, 6bits, Intel

Eb/No (dB)

PE

R

6bits-Intel(Perm)6bits-Intel(SubcShift)6bits-Intel(SeqMap)6bits-Intel(filtered)

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Performance Comparison of PFBCH

(Samsung, Nortel, ITRI, LGE, Intel)

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PFBCH@PB3: 2x6 tile

• 4bits: Intel, Nortel LGE outperform the rest

• 5bits/6bits: all results are very similar

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PFBCH@ VA120: 2x6 tile

• 4bits: Intel, Nortel LGE outperform the rest

• 5bits/6bits: all results are very similar

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PFBCH@ VA350: 2x6 tile

• 6bits:– Overall: low pass filter based detection outperforms the rest– Enhanced basic receiver:

• PER=0.1: Intel, LGe, Samsung(updated codeword+Perm) are among the best

• PER=0.01: LG (w. permutation), Samsung (updated codeword + perm) outperforms the rest

4 5 6 7 8 9 10 11 12 13 14

10-2

10-1

100

PCQICH-VA350-1x2, 6bits,sequence mapping

Eb/No (dB)

PE

R

6bits-Samsung(subcshift)6bits-LG(Perm)

6bits-Nortel(SeqMap)

6bits-Intel(SeqMap)

6bits-Intel(Perm)

6bits-Intel(filtered)6bits-samsung(updated codeword)(Perm)

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Summary @PFBCH

Scenarios 4-bits Best Performance 5/6-bits Best Performance

PCQICH@PB3, 2x6 tile Intel, LG, Nortel All results are similar

PCQICH@VA120 , 2x6 tile Intel, LG, Nortel All results are similar

PCQICH@VA350, 2x6 tile (N/A) LG, Intel, Samsung^^

Scenarios 4/5-bits Best Performance 5/6-bits Best Performance

Orthogonal Property Analysis

Nortel, Intel, Samsung^ Nortel, Intel, Samsung^

Better orthogonal property implies more consistent performance across various SNR and channel condition

Summary 1) Overall Intel, Samsung^^’s design is preferred2) Sequence Mapping, Permutation, Subcarrier shifting are

good candidates to better performance@VA3503) Low pass filter can be used for advanced receiver

Note: 1) Samsung^: Samsung’s updated code sequence

2) Samsung^^: Samsung’s updated code sequence + permutation

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Backup Slides

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Simulation Setting

Channel Bandwidth 10MHz

Over-sampling Factor 28/25

FFT Size 1024

Cyclic prefix (CP) ratio 1/8

Channel condition PB3, VA120, VA350

The number of antennas Tx:1, Rx:2

Modulation BPSK/QPSK

Channel estimation 2-D MMSE

Tile size 2x6, 6x2, 6x3

Block size 6x6

Receiver PFBCH: non-coherent detection, MLD

SFBCH: coherent detection, MLD

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PFBCH: Methods proposed to better performance@VA350(cont.)-advanced non-coherent receiver (from Qinghua,Yuan)

• Detected CQI sequence

where

is the predefined orthogonal sequence, and r(j) is received signal of j-th subcarrier

• To reduce complexity, R can be predefined by assuming a fixed high speed and a conservative time spread without obvious performance loss

ii

cc

H

Nii

Nipi cc rIRrcr

121

,,1,,10 maxargmaxarg

jcjrjr ii

1c

HhhR E

Tfiii Ncc 1c