1. Investigation on one and two stream BCH MIMO Schemes
Document Number: IEEE C80216m-09/0122
Date Submitted:
Source:
Yi Hsuan, Debdeep Chatterjee, Senjie Zhang, Jiacheng Wang, Hujun Yin, Yang-seok Choi }
Intel Corporation
Venue:
IEEE Session #59, San Diego, US.
Re: TGm SDD section
Base Contribution:
N/A
Purpose:
For TGm discussion and adoption of m SDD text.
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2. 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).

3. 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

4. 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.

5. 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.

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