Title: Improvements in System Performance with spatial multiplexing for MBS Document Number: IEEE C802.16m-08/609r1 Date Submitted: 2008 – 10 - 31 Source:

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Title: Improvements in System Performance with spatial multiplexing for MBS Document Number: IEEE C802.16m-08/609r1 Date Submitted: 2008 – Source: Kaushik Josiam, Zhouyue Pi, Farooq Khan Voice: Samsung Telecommunications America 1301 E. Lookout Dr Richardson TX Venue: Session #58, November 2008 Re: TGm SDD: Other, Call for comments on Project m SDD, IEEE C802.16m-08/040 Purpose: Supporting contribution for comment on SDD Text for Downlink MIMO Schemes Notice This document does not represent the agreed views of the IEEE 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 Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. 7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and. 1

Improvements in System Performance with Spatial Multiplexing for MBS Kaushik Josiam, Zhouyue Pi and Farooq Khan Samsung Telecommunications America

Single-Frequency Network (SFN) An SFN operation is realized by transmitting the same information in the same OFDM time-frequency resource from multiple “synchronized” cells: – Cell synchronization within the OFDM symbol cyclic prefix required – A CP of 18.88μs used for E-MBS

Requirements Performance Requirement: 1% average FER Coverage Target: 95% of locations Desired spectral efficiency targets assuming SFN and ignoring overhead [1]: Inter-cell DistanceMin Spectral Efficiency (bps/Hz) 500m4 1500m2

Broadcast Geometry Maximum SINR is capped to 30dB per antenna

MIMO for EBM Baseline is 1x2 configuration Proposed scheme to achieve minimum spectral efficiency targets – 2x2 MIMO with open loop spatial multiplexing. – 2 layers corresponding to two code words. – For this simulation, both code words assumed to have the same MCS. No significant gains from transmit diversity due to sufficient frequency diversity from SFN

System Simulation Parameters Layout19 cells, 3 sectors per cell Operating Frequency2000 MHz Minimum Mobile-to-BS distance35m Test SectorCenter cell, any sector Sector OrientationBore-sight pointing Antenna Pattern70° sectored beam Propagation Model log 10 (d) Shadowing Standard Deviation8dB Shadowing Correlation between BSs0.5 Penetration Loss20dB Rx Noise Figure9dB SFN Combining57 Sectors BS power per sector per antenna43dBm

System Simulation Parameters Bandwidth10 MHz Tone Spacing15 KHz Number of Tones600 Channel ModelComposite Channel comprised of 3 TU-6 channels, 3 Km/h TX antennas1,2 RX antennas2 Spatial CorrelationNone ReceiverMMSE-SIC Link-to-system mappingEESM Pilot and Cyclic Prefix Overhead28% Cyclic Prefix duration18.88μs Channel EstimationPerfect FECInner Turbo Code, no outer code

MCS and Spectral Efficiency MCSSpectral Efficiency (b/s/Hz) (Accounting for pilot and CP overhead) QPSK Rate ½ QAM Rate 1/ QAM Rate ½ QAM Rate 2/ QAM Rate ½ QAM Rate 2/ QAM Rate ¾ QAM Rate 4/53.45

Results: ICD = 500m 100% improvement in spectral efficiency at 95% coverage Max MCS – 64QAM Rate 4/5

Results: ICD = 1000m 50% improvement in spectral efficiency at 95% coverage

Summary For ICD = 500m, we see doubling in spectral efficiency for the same coverage with SFN Increasing ICD, reduces this gain in spectral efficiency – 50% improvement with ICD 1Km

Recommendation Adopt the following text into MIMO for Multi-cast Broadcast Services of the SDD: Open-loop spatial multiplexing schemes as described in Section 11.x shall be supported for MBS. The MBS data shall contain at most two layers and shall contain up to two codewords. The transmission format for multi-codeword transmission shall include a primary codeword and a secondary codeword. The primary and secondary codewords may use different modulation and coding and/or power offsets in order to enable efficient interference cancellation at the mobile station. The pilots for different layers shall be orthogonal and located at different time-frequency positions. The pilots from all the BSs in a MBS zone shall be transmitted using the same time-frequency positions and the same scrambling code. This provides for an overall composite channel estimate for the signal received from multiple base stations transmitting the same content in the broadcast zone.