1. UL Pilot Evaluation Results
Document Number: IEEE C802.16m-08/1098
Date Submitted:
Source:
Jiacheng Wang
Huaning Niu
Jong-kae (JK) Fwu
Yuval Lomnitz
Sassan Ahmadi
Hujun Yin
Intel Corp.
Venue:
IEEE Session #57, Kobe, Japan.
Re: PHY: Text; in response to the TGm Call for Contributions and Comments m-08/033 for Session #57
Base Contributions:
None
Purpose:
RE: IEEE m-08/024 Call for Comments on Project m System Description Document (SDD) on the topic of DL pilot.
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2. UL Pilot Evaluation: 6x6 tile

3. Simulation Setting
eITU channel, with half lambda spacing in Tx, 4 lambda spacing at Rx.
MIMO scheme:
2x2 2 streams collaborative MIMO
Pilot boosting is 3dB per stream for all patterns
Same power combined with Null
Noise limited case only
2% subcarrier spacing and +/- 1/8 CP timing offset. Perfect noise estimation

4. Key Observations
Intel, Huawei-D and Cairo University have exactly the same 6x6 pilot pattern.
MediaTek, LGE and Nortel have similar pilot patterns
MeidaTek has same pattern as LGE with the second pair of pilot flipped
MeidaTek used a rotated/shifted version of Nortel 6x6 pilot
For MMSE channel estimation, Samsung's pattern is very unstable since it use 2 pilot per stream.
For MMSE channel estimation, Huawei C, NSN and Postdata (old pattern) have slightly inferior performance than others
All others are good performance.
For MMSE channel estimation, Intel/HuaweiD/CairoU, MediaTek and LGE are among the best

5. eITU PB3, 2x2 SM, MMSE CE

6. eITU PB3, 2x2 SM, MMSE CE

7. eITU VA120, 2x2 SM, MMSE CE

8. eITU VA120, 2x2 SM, MMSE CE

9. Conclusions:
UL 18x6 pilot patterns should reuse the DL 18x6 pilot patterns
Please refer to C80216m-08_847r2.ppt for 18x6 DL pilot performance comparison and summary
UL 6x6:
Pilot patterns from Intel/HuaweiD/CairoU, MediaTek and LGE are among the best (with similar performance) and can be recommended for UL 6x6 pilot design.

10. UL Pilot Proposal : Use same DL pilot pattern + 6x6 pilot
6x6 pilot: TBD

11. Backup Slides

12. UL Pilot Patterns (1)
Samsung
MediaTek (New and Old)
NSN

13. UL Pilot Patterns (2)
Intel
LGE
Nortel
ZTE

14. UL Pilot Patterns (3)
Posdata
Huawei
Cairo University