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Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template...

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Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date Submitted: 2009-11-11 Source: Wang Zhen, David Mazzarese, Sangheon Kim, [email protected] Heewon Kang, Hokyu Choi Samsung Electronics Venue: IEEE 802.16m Session#64, Atlanta, USA LB30a Base Contribution: IEEE C80216m-09_2253 Purpose: Discussion and approval 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 >.
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Page 1: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Performance Evaluation of Pilots for MIMO Mode 5 (CDR)

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE S80216m-09_2253Date Submitted:

2009-11-11Source:

Wang Zhen, David Mazzarese, Sangheon Kim, [email protected] Kang, Hokyu Choi Samsung Electronics

Venue:IEEE 802.16m Session#64, Atlanta, USA LB30a

Base Contribution:IEEE C80216m-09_2253

Purpose:Discussion and approval

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 >.

Page 2: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Introduction

• Problem statement– 1-stream pilot pattern for CDR (MIMO mode 5) in the

open-loop region is missing– 1-stream pilot pattern of Fig 489 or 491 is not appropriate

because CDR needs an even number of tones between two pilot positions in the same OFDM symbol

• Proposed candidates– CoFIP pilots have been proposed in S80216m09_2238– We propose to reuse the 2-stream interlaced pilot pattern

by assigning both pilot indices 1 and 2 to a single stream

Page 3: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

0 P 0 0 P 0

0 P 0P 0 0

0 0 P 0 0 P

P denotes pilot tone and 0 denotes null tone

P 0 0 P 0 0

0 0 P0 P 0

0 P 0 0 P 0

0 0 P 0 0 P

P 0 00 0 P

P 0 0 P 0 0

Pilot pattern Set 0 Pilot pattern Set 1 Pilot pattern Set 2

CoFIP (S80216m09_2238)

Page 4: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

This Proposal (12 pilots)

Page 5: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Comparison of the 2 proposals

CoFIP (pilots on pilots, pilots on null tones, data on data)

12 pilots (pilots on pilots, pilots on data , data on data)

Channel estimation

6 pilots per stream, interference from pilots of sector with same interlace

12 pilots per stream, interference from all sectors (pilots and data)

Interference estimation

Direct MMSE Rx: worst-case estimate on null tones, miss interference on desired pilot

Indirect MMSE Rx: exact interference on data after cancellation of desired pilot

4x4 Interference covariance matrix for CDR

Reuse 1 pilot tone and its conjugate for covariance matrix of interference: noise correlation

Use 2 adjacent pilot tones for covariance matrix of interference on actual CDR pair of data tones

CQI estimation

On null tones, not capturing interference on same interlace

On data over desired pilots, averaged over the OL region in time domain

Throughput 108-18 = 90 108-12 = 96

Not straightforward to guess which one is better

Assumption: 2 receive antennas at AMS

Page 6: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Simulation parameters

1. 2Tx antenna – 2Rx antenna, one stream CDR transmission

2. Channel: Modified Ped B, 3 km/h

3. Thermal noise level is 10 dB below the power of the desired signal

4. QPSK ½ CTC , four 18x6 PRUs forms a channel coding block.

5. 2D-MMSE channel estimation. All estimation done within a PRU

6. The CoFIP and a newly proposed pilot pattern are used for CDR

6

Page 7: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Receiver structure• CoFIP

– Estimate the signal channel in pilot position and the interference channel in null-tone position

– Generate IC (interference correlation) matrix by stacking the estimated channel on one pilot tone and its conjugate

– Use Direct MMSE receive filter to combine the received signal

• 12 pilots– Estimate the signal channel in each pair of pilot tones (totally 6

pairs)– Generate IC matrix by subtracting the estimated pilot signal

from the received signal for each pair of pilot tones– Use Indirect MMSE receiver filter to combine the received signal

Page 8: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Full data transmission

• 3cells (1 serving cell & 2 interference cells)

Cell index Power profile Pilots trans Data trans

0 1 on on

1 1 on on

2 1 on on

Page 9: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

FER with 1 serving cell & 2 interference cells

-10 -8 -6 -4 -2 0 2 4 6 8 1010

-3

10-2

10-1

100

SINR (dB)

FE

R

Full data transmit

CDR CoFIP 3cell full

CDR 12pilot 3cell full

CoFIP is good for CDR when there is no interference pilot on the desired pilot, especially at higher SNR

Page 10: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Goodput with 1 serving cell & 2 interference cells

-10 -8 -6 -4 -2 0 2 4 6 8 1010

20

30

40

50

60

70

80

90

100

SINR (dB)

Goo

dput

Goodput

CoFIP 3cell full

12Pilot 3cell full

The channel estimation advantage is not leveraged in the goodput due to the overhead of null tones

Page 11: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Full data transmission

• 4cells (1 serving cell & 3 interference cells)

Cell index Power profile Pilots trans Data trans

0 1 on on

1 1 on on

2 1 on on

3 0.5 on on

Page 12: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

FER with 1 serving cell & 3 interference cells

-10 -8 -6 -4 -2 0 2 4 6 8 1010

-3

10-2

10-1

100

SINR (dB)

FE

R

Full data transmit

CDR CoFIP 4cell full

CDR 12pilot 4cell full

CoFIP is not as good for CDR when there is interference pilot on the desired pilot, but both patterns are similar with 3 interferers

Page 13: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Goodput with 1 serving cell & 3 interference cells

-10 -8 -6 -4 -2 0 2 4 6 8 100

10

20

30

40

50

60

70

80

90

100

SINR (dB)

Goo

dput

Goodput

CoFIP 4cell full

12Pilot 4cell full

With the same channel and interference estimation quality, goodput is better without null tones

Page 14: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Full data transmission

• 7cells (1 serving cell & 6 interference cells)

Cell index Power profile Pilots trans Data trans

0 1 on on

1 1 on on

2 1 on on

3 0.5 on on

4 0.5 on on

5 0.5 on on

6 0.1 on on

Page 15: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

FER with 1 serving cell & 6 interference cells (full interference)

-10 -8 -6 -4 -2 0 2 4 6 8 1010

-3

10-2

10-1

100

SINR (dB)

FE

R

Full data transmit

CDR CoFIP 7cell full

CDR 12pilot 7cell full

No more advantage of CoFIP with 6 interferers, which is still under-estimating the real-world situation

Page 16: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Goodput with 1 serving cell & 6 interference cells (full interference)

-10 -8 -6 -4 -2 0 2 4 6 8 100

10

20

30

40

50

60

70

80

90

100

SINR (dB)

Goo

dput

Goodput

CoFIP 7cell full

12Pilot 7cell full

Clear goodput advantage of proposed 12 pilots pattern

Page 17: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Empty data transmission

• 7cells (1 serving cell & 6 interference cells)

Cell index Power profile Pilots trans Data trans

0 1 on on

1 1 on on

2 1 on off

3 0.5 on on

4 0.5 on off

5 0.5 on on

6 0.1 on on

Page 18: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

FER with 1 serving cell & 6 interference cells (partial interference)

-10 -8 -6 -4 -2 0 2 4 6 8 1010

-3

10-2

10-1

100

SINR (dB)

FE

R

Full data VS empty data transmit

CDR CoFIP 7cell 2empty

CDR 12pilot 7cell 2empty

No more advantage of CoFIP with 6 interferers, which is still under-estimating the real-world situation

Page 19: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Goodput with 1 serving cell & 6 interference cells (partial interference)

-10 -8 -6 -4 -2 0 2 4 6 8 100

10

20

30

40

50

60

70

80

90

100

SINR (dB)

Goo

dput

Goodput

CoFIP 7cell 2empty

12Pilot 7cell 2empty

Clear goodput advantage of proposed 12 pilots pattern

Page 20: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Conclusion

• 12 pilots pattern is better than CoFIP in terms of FER in real-world scenarios where– The number of interferers is greater than 3– No data is transmitted by some neighbouring ABS

• 12 pilots pattern is better than CoFIP in terms of goodput– In all cases

Page 21: Performance Evaluation of Pilots for MIMO Mode 5 (CDR) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-09_2253 Date.

Text Proposal

• Adopt the proposal in the base contribution C80216m-09_2253


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