1 Design and Cross Evaluation results for the IEEE 802.16m UL Primary Fast Feedback Channels Document Number: C802.16m-09/0729 Date Submitted: 2009-03-09.

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1 Design and Cross Evaluation results for the IEEE m UL Primary Fast Feedback Channels Document Number: C802.16m-09/0729 Date Submitted: Source: Hongmei Sun, Qinghua Li, Jong-Kae (JK) Fwu, {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 m-09/0012 Target topic: UL PHY Control Base Contribution: N/A Purpose: To be discussed and adopted by TGm for use in m AWD 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.

2 Contributions on Fast Feedback Channel Design LGEC80216m-09_0289.doc ITRIC80216m-09_0225.doc NortelC80216m-09_0294r2.doc SamsungC80216m-09_0346r2.pdf [ ]P-FBCH(Samsung).pptx IntelC80216m-09_0125.ppt C80216m-09_0198.doc Other source:C80216m-UL_Control_DG_AWD_v7r2.doc or updated version

3 Outline Intel’s PFBCH design Sequence Orthogonal Property Comparison on Methods proposed to better performance of PFBCH Design Cross Evaluation Results using evaluation criteria agreed upon in UL PHY Control RG –Samsung, Nortel, LG, ITRI, Intel Summary

4 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, N sub x N sym): 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

5 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^ LGe ITRI Nortel Intel 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^ LGe ITRI Nortel Intel 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^ LGe ITRI Nortel Intel 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

6 PFBCH : Methods proposed to better 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) 1 st FMT: 2) 2 nd FMT: 3) 3 rd 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

7 PFBCH: Methods proposed to better (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 –Should be used for enhanced basic receiver –Low pass filter can be used for advanced receiver

8 Performance Comparison of PFBCH (Samsung, Nortel, ITRI, LGE, Intel)

9 2x6 tile 4bits: Intel, Nortel LGE outperform the rest 5bits/6bits: all results are very similar

10 VA120: 2x6 tile 4bits: Intel, Nortel LGE outperform the rest 5bits/6bits: all results are very similar

11 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

12 Scenarios4-bits Best Performance5/6-bits Best Performance 2x6 tileIntel, LG, NortelAll results are similar 2x6 tileIntel, LG, NortelAll results are similar 2x6 tile(N/A)LG, Intel, Samsung^^ Scenarios4/5-bits Best Performance5/6-bits Best Performance Orthogonal Property Analysis Nortel, Intel, Samsung^ Better orthogonal property implies more consistent performance across various SNR and channel condition Summary 1)Overall Intel, Samsung^^’s design is preferred 2)Sequence Mapping, Permutation, Subcarrier shifting are good candidates to better 3)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

13 Backup Slides

14 Simulation Setting Channel Bandwidth10MHz Over-sampling Factor28/25 FFT Size1024 Cyclic prefix (CP) ratio1/8 Channel conditionPB3, VA120, VA350 The number of antennasTx:1, Rx:2 ModulationBPSK/QPSK Channel estimation2-D MMSE Tile size2x6, 6x2, 6x3 Block size6x6 ReceiverPFBCH: non-coherent detection, MLD SFBCH: coherent detection, MLD

15 PFBCH: Methods proposed to better -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