1. Preamble Requirements in IEEE802.16m IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/485 Date Submitted: 2008-05-05 Source: Chris Williams, Kevin Power, Sunil Vadgama Fujitsu Laboratories of EuropeE-mail:{chris.williams,kevin.power,sunil.vadgama}@uk.fujitsu.com * http://standards.ieee.org/faqs/affiliationFAQ.html Re:IEEE 802.16m-08/0016 Call for Contributions on Project 802.16m SDD; Topic - Preambles Purpose: For discussion at TGm and adoption within Project 802.16m SDD 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: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Basic Requirements Role of the Preamble –Synchronization (time/frequency) –Cell search (discriminate segments) –C/I estimation –Channel estimation –Determine location of FCH Require rapid acquisition and low PAPR

3. Further Requirements Support MIMO channel estimation –Up to 4 antenna support –Preamble for each antenna must cover entire bandwidth Large cell ID set to support femto/pico base stations –19 macroBS x 3 sector x 30 fBS/sector = around 1700

4. Legacy (16e) Preamble Single symbol per frame Meets basic requirements: Supports 3 segments with distinct preamble sequences by subcarrier offset Sequence based on cell ID, and permutation is derived from it Only single antenna solution Only 114 distinct cell IDs Modulates 1 subcarrier in 3, which gives time domain structure useful for initial acquisition

5. 16m Preamble Required to meet additional requirements –MIMO –Expanded set (> factor 15) Not significantly increase complexity –Not expand search space by much Exploit superframe structure

6. MIMO Support (examples) Trade frequency sampling and mobility against overhead Need to define requirements Still use offset to discriminate between segments Initial acquisition based on first preamble, information in FCH signals presence and location of other preambles

7. Supporting Expanded Sequence Set Large search space with single preamble not ideal Suggest using multiple preamble symbols One of these could be from the legacy system –First preamble is in 16m superframe header (SFH) –Further preamble to coincide with legacy preamble Can use 2 preambles for other functions, such as MIMO support

8. Summary 16m should exploit superframe structure to enhance preamble functionality MIMO channel estimation would support enhanced MIMO functionality (low mobility) Require more sequences for cell ID, combining multiple preamble symbols limits complexity

9. Text Proposal Insert into SDD -----------------Text Start---------------- The first preamble is contained in the superframe header and is used for initial acquisition. Further preambles may be transmitted within the superframe in order to support enhanced functionality, such as MIMO channel estimation and an expanded cell ID set. -----------------Text Start----------------