Title: Evaluation of DL MIMO Schemes: OL SU Spatial Multiplexing with 2-D MMSE channel estimation

Document Number: IEEE C802.16m-08/1043r2Date Submitted: 2008 – 09 - 16

Source:

Kaushik Josiam, Zhouyue Pi, Bruno Clerckx, David Mazzarese Voice:+972 761-7000

kjosiam@sta.samsung.comSamsung Telecommunications America1301 E. Lookout DrRichardson TX 75082

Venue: Session #57, 16-19 September 2008

Re: PHY: MIMO; in response to the TGm Call for Contributions and Comments 802.16m-08/033 for Session 57 Purpose: Supporting contribution for comment on SDD TextNoticeThis 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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Simulation ParametersParameter Value

Modulation QPSK, 16-QAM, 64-QAM

Coding Rate 1/3, 1/2 , 2/3, ¾

Receiver Function 2-D MMSE Channel Estimator , MMSE receiver

Sub-frame Duration 0.617ms

Transmission BW 10MHz

Usable Subcarriers 54

CP Length 11.4286µs

PRU Size 18 tones, 1 sub-frame

Block Size FEC Block fills up 3 PRUs

Turbo Decoding Max-Log, 8 iterations

Turbo Code LTE

Number of OFDM symbols per sub-frame 6

Channel Model TU-6

Precoding Unitary , optimized Samsung codebook with cycling per RB 2

4 - Transmit 2-Receive Antennas QPSKChannel Estimation is done per PRU. Dedicated pilots used. Codebook optimized with 4 codewords chosen for good distance properties. One codeword is applied per PRU.

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4 - Transmit 2-Receive Antennas 16-QAMChannel Estimation is done on a per PRU. Dedicated pilots used. Codebook optimized with 4 codewords chosen for good distance properties. One codeword is applied per PRU.

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4 - Transmit 2-Receive Antennas 64-QAMChannel Estimation is done on a per PRU. Dedicated pilots used. Codebook optimized with 4 codewords chosen for good distance properties. One codeword is applied per PRU.

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4-Transmit 2 – Receive Antennas MSE of 2D- MMSE Channel EstimatorDedicated pilots used on a TU-6 channel. The pilot pattern for Rank -2 transmission is shown on the right for a PRU.

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COMPARISON WITH ANTENNA HOPPING FOR 4X2 FULL RANK SM

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4 - Transmit 2-Receive Antennas QPSK with Channel Estimation2 out of 4 transmit antennas chosen randomly for Antenna Hopping.

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4 - Transmit 2-Receive Antennas 16-QAM with Channel Estimation2 out of 4 transmit antennas chosen randomly for Antenna Hopping.

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4 - Transmit 2-Receive Antennas 64-QAM with Channel Estimation2 out of 4 transmit antennas chosen randomly for Antenna Hopping.

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4 - Transmit 2-Receive Antennas QPSK rate 1/2 with Channel EstimationAntenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots

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4 - Transmit 2-Receive Antennas 16-QAM rate ½ with Channel Estimation

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Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots

4 - Transmit 2-Receive Antennas QPSK rate 1/2 Goodput with Channel EstimationAntenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots

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4 - Transmit 2-Receive Antennas 16-QAM rate ½ Goodput with Channel Estimation

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Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots

Observations• BLER Performance of precoder cycling is identical to antenna hopping

with channel estimation when hopping is done over a PRU– But antenna hopping can have power imbalance that can be avoided

by using precoders.• Goodput Performance of precoder cycling per PRU with dedicated pilots is

better than antenna hopping per tone with common pilots.• Recommendations to TGm

– Keep the current baseline text in section 11.8.2.1.1.2 of the SDD. – Remove SM + Antenna Hopping from the items for FFS in the SDD.

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