HARQ 1-bit Feedback Design IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-09/0223 Date Submitted: 2009-1-7 Source:

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HARQ 1-bit Feedback Design IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-09/0223 Date Submitted: Source: Zheng Yan-Xiu, Yu-Chuan Fang, Chang-Lan Tsai, Chung-Lien Ho, Hsi-Min Hsiao, Ren-Jr Chen, Richard Li, ITRI Venue: IEEE Session #59, San Diego. Base Contribution: N/A Re: IEEE m-08/053r1, “Call for Comments and Contributions on Project m Amendment Working Document”. Target topic: “ PHY Structure”. Purpose: To be discussed and approval by IEEE m TG 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.

Motivation This contribution proposes a 1-bit HARQ feedback This feedback is compatible with HARQ joint coding method proposed in contribution C80216m- 09_0046r1 The proposed design can provide better performance in high mobility

Existing Design and New Design An existing design –IEEE C80216m-08_1057r2 –12 orthogonal sequences –6 for ACK and 6 for NACK –6 independent HARQ channels for 6 users –Distribute the code on three 2x6 or 6x2 resource tile –Non-coherent detection is used to detect code sequence New design –Each HARQ channel chooses two sequences S i and S j from these 12 sequences to construct a new sequence –ACK= –NACK= No.orthogonal Sequence S1S S2S S3S S4S S5S S6S S7S S8S S9S S S S

Performance Comparison Similar performance is achieved at 3km/hr and 120km/hr When mobility is 350km/hr, around 2dB performance gain be achieved at detection error rate=10 -4 Channel Bandwidth10MHz Over-sampling Factor28/25 FFT Size1024 Cyclic prefix (CP) ratio1/8 Channel conditionPB3, VA120, VA350 The number of antennasTx:1, Rx:2 ModulationPAM FMT size6x2 Block size6x6 ReceiverHARQ FB: non-coherent detection, MLD

Conclusion The proposed method is robust for mobility. Text proposal is in C802.16m-09/0225