Investigation on one and two stream BCH MIMO Schemes Document Number: IEEE C80216m-09/0122 Date Submitted: 2009-1-5 Source: Yi Hsuan, Debdeep Chatterjee, Senjie Zhang, Jiacheng Wang, Hujun Yin, Yang-seok Choi Email: {yi.hsuan@intel.com, debdeep.chatterjee@intel.com, senjie.zhang@intel.com, jiacheng.wang@intel.com, hujun.yin@intel.com, yang-seok.choi@intel.com } Intel Corporation Venue: IEEE Session #59, San Diego, US. Re: TGm SDD section 11.7.2.2.4 Base Contribution: N/A Purpose: For TGm discussion and adoption of 802.16m 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/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 >.

Overview The current SDD text on multiple antenna schemes for BCH says “Transmission of PBCH and SBCH as one stream or two streams is FFS”. This contribution is to compare BCH performance using either random beamforming (one stream) or SFBC (two stream).

Evaluated Scenarios Antenna Scheme: Diversity schemes: 2Tx and 2Rx antennas Diversity schemes: Random beamforming (RBF) SFBC Antenna spacing: High correlation Tx antenna case (0.5 lambda antenna spacing) Low correlation Tx antenna case (4 lambda antenna spacing) Rx antenna spacing is 0.5 lambda Traffic model: eITU-PedB 3 km/h eITU-VehA 120 km/h

Additional Simulation Parameters Bandwidth: 10 MHz Carrier frequency: 2.5 GHz Number of information bits: 48 Modulation and Coding: QPSK ½ CC with 8 repetitions Channel estimation: PRU based MMSE Resource: distributed LRU MIMO receiver: MMSE Angle of Departure: -60, -30, 0, 30, 60 degrees Pilots: The two stream pilot pattern in SDD is used for both SFBC and random beamforming. 5 dB pilot boost over data is applied.

Conclusion RBF shows slightly better performance than SFBC when AoD is 0 degree. With AoD other than 0 degree, RBF has significantly more performance degradation than SFBC. Averaged over different AoD values, SFBC has better overall performance than RBF. For BCH transmission, it is critical to maintain the robustness of channel and provide a more uniform coverage of the cell. In that sense, SFBC is superior to random beamforming. We propose to use SFBC for BCH MIMO transmission.

Proposed SDD Text Change: Replace the following sentence on page 92, line 13 and 14 of 11.7.2.2.4 “Transmission of PBCH and SBCH as one stream or two streams is FFS.” with “PBCH and SBCH are transmitted with two stream MIMO schemes.”