1. Document Number: IEEE C80216m-09_2238 Date Submitted: 2009-11-05
CoFIP Pilot Structure
Document Number: IEEE C80216m-09_2238
Date Submitted:
Source:
Padmanabhan M S, Kiran Kuchi, J. Klutto Milleth, Sivakishore Voice:
CEWiT, India
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:
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2. Collision Free Interlaced Pilots (CoFIP)

3. The CoFIP Pattern for regular sub frames with 6 OFDM symbolsP 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

4. The CoFIP Pattern for irregular sub frames with 5 OFDM symbolsP 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

5. Proposed text
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 Section 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
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