Title Evaluation of DL MIMO Schemes OL SU

Title: Evaluation of DL MIMO Schemes: OL SU Spatial Multiplexing with 2 -D MMSE channel estimation Document Number: IEEE C 802. 16 m-08/1043 r 2 Date Submitted: 2008 – 09 - 16 Source: Kaushik Josiam, Zhouyue Pi, Bruno Clerckx, David Mazzarese Voice: +972 761 -7000 kjosiam@sta. samsung. com Samsung Telecommunications America 1301 E. Lookout Dr Richardson TX 75082 Venue: Session #57, 16 -19 September 2008 Re: PHY: MIMO; in response to the TGm Call for Contributions and Comments 802. 16 m-08/033 for Session 57 Purpose: Supporting contribution for comment on SDD Text 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/sect 67. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and 1 <http: //standards. ieee. org/board/pat >.

Simulation Parameters Parameter 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. 617 ms Transmission BW 10 MHz 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 QPSK Channel Estimation is done per PRU. Dedicated pilots used. Codebook optimized with 4 codewords chosen for good distance properties. One codeword is applied per PRU. 3

4 - Transmit 2 -Receive Antennas 16 -QAM Channel 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. 4

4 - Transmit 2 -Receive Antennas 64 -QAM Channel 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. 5

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

COMPARISON WITH ANTENNA HOPPING FOR 4 X 2 FULL RANK SM 7

4 - Transmit 2 -Receive Antennas QPSK with Channel Estimation 2 out of 4 transmit antennas chosen randomly for Antenna Hopping. 8

4 - Transmit 2 -Receive Antennas 16 -QAM with Channel Estimation 2 out of 4 transmit antennas chosen randomly for Antenna Hopping. 9

4 - Transmit 2 -Receive Antennas 64 -QAM with Channel Estimation 2 out of 4 transmit antennas chosen randomly for Antenna Hopping. 10

4 - Transmit 2 -Receive Antennas QPSK rate 1/2 with Channel Estimation Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C 802. 16 m-08/1193 r 1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots 11

4 - Transmit 2 -Receive Antennas 16 -QAM rate ½ with Channel Estimation Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C 802. 16 m-08/1193 r 1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots 12

4 - Transmit 2 -Receive Antennas QPSK rate 1/2 Goodput with Channel Estimation Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C 802. 16 m-08/1193 r 1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots 13

4 - Transmit 2 -Receive Antennas 16 -QAM rate ½ Goodput with Channel Estimation Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C 802. 16 m-08/1193 r 1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots 14

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. 15