Document Number: IEEE C80216m-09_2238 Date Submitted: 2009-11-05 CoFIP Pilot Structure Document Number: IEEE C80216m-09_2238 Date Submitted: 2009-11-05 Source: Padmanabhan M S, Kiran Kuchi, J. Klutto Milleth, Sivakishore Voice: CEWiT, India E-mail: kkuchi@cewit.org.in, klutto@cewit.org.in Venue: Comments on P802.16m/D2 Base Contribution: None Purpose: To discuss and adopt the proposed text in D3 To discuss in TGm for appropriate action. 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 >.

Collision Free Interlaced Pilots (CoFIP)

The CoFIP Pattern for regular sub frames with 6 OFDM symbols P P Pilot pattern Set 1 Pilot pattern Set 2 Pilot pattern Set 0 P denotes pilot tone and 0 denotes null tone Fig 1a, 1b, 1c

The CoFIP Pattern for irregular sub frames with 5 OFDM symbols P P Pilot pattern Set 1 Pilot pattern Set 2 Pilot pattern Set 0 P denotes pilot tone and 0 denotes null tone Fig 2a, 2b, 2c

Proposed text ……………………..Start of Text……………………………………………………….  Section 15.3.5.4.1 page 304 line 41 Rank-1 OL MIMO region shall use Collision Free Interlaced Pilot Structure (CoFIP). In CoFIP mode, null tones shall be introduced in the 1-stream interlaced pilot pattern. Fig 1 shows the CoFIP structure AAI sub-frames consisting of 6 OFDM symbols. The index of the CoFIP PRU type used by a particular BS with Cell_ID=k is denoted by pk. The index of the pilot pattern set used by a particular BS with the Cell_ID=k is denoted by pk. The index of the pilot pattern set is determined by the Cell_ID according to the following equation: pk = mod(k,3). Fig 2 shows the pilot pattern set for AAI sub-frames consisting of 5 OFDM symbols. For AAI sub-frames consisting of 7 OFDM symbols, the first OFDM symbol which contains pilot tones and null tones in each pilot pattern set shown in Fig 1 is added as the 7th symbol ……………………..End of Text……………………………………………………….