1 Performance comparison of Modulation and Coding set for IEEE 802.16m system Document Number: IEEE C802.16m-09/0555r2 Date Submitted: 2009-03-02 Source:

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Presentation transcript:

1 Performance comparison of Modulation and Coding set for IEEE m system Document Number: IEEE C802.16m-09/0555r2 Date Submitted: Source: Hua Zhou, Shengbao Liang, Yuanrong Lan, Jie Zhang, Yuantao Zhang, Jinyin Xue, Jian Wang, Jun Tian Voice: Fujitsu R&D Center. Venue: Call for comment on m amendment working document Comment for the text of “ Channel coding and HARQ ” Base Contribution: C802.16m-08_1425 Purpose: To be discussed and adopted into the m AWD by TGm. 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. Further information is located at and.

2 Introduction FEC&HARQ DG work out the draft proposal for nominal modulation and coding set. But this MCS table is lack of system level simulation result support. Without simulation results, we can not say how it works. We would like to investigate the existing MCS candidate on system level simulation, which can tell us how new MCS table work. In other hand, 4-bit table or 5-bit table should also be evaluated, considering LTE has 29-element MCS table. We might not close the MCS table size discussion until we have enough simulation results.

3 Summary The simulation shows that two MCS tables have almost same performance. However, Fujitsu’s proposal has a little gain over contribution C802.16m-09_0510’s proposal. At least right now, we can not say which MCS table is good through limited simulation evaluation. We propose not to conclude MCS table before we have more time of simulation, for example, with CL-MIMO case, and different simulation scenario.

4 Some explanation With CRU-based AMC, ideal channel estimation, and HARQ, two MCS table have similar performance, since HARQ retransmission might mask the initial MCS selection mismatch. In the other hand, PF scheduler might also hide the link variance by utilizing multi-user selection gain. In order to get insight how MCS table influence system throughput, we need more simulation.

5 Simulation results System level simulation Sector Throughput (Mbps)User Coverage 5%(bps/Hz) MIMO (2x2)MIMO(4x4)MIMO (2x2)MIMO(4x4) 16e MCS table Fujitsu ’ s MCS table C802.16m-09_0510 ’ s MCS table

6 C802.16m-09_0510’s proposal MCS indexModulationCode rate ‘ 0000 ’ QPSK31/256 ‘ 0001 ’ QPSK48/256 ‘ 0010 ’ QPSK71/256 ‘ 0011 ’ QPSK101/256 ‘ 0100 ’ QPSK135/256 ‘ 0101 ’ QPSK171/256 ‘ 0110 ’ 16QAM102/256 ‘ 0111 ’ 16QAM128/256 ‘ 1000 ’ 16QAM155/256 ‘ 1001 ’ 16QAM184/256 ‘ 1010 ’ 64QAM135/256 ‘ 1011 ’ 64QAM157/256 ‘ 1100 ’ 64QAM181/256 ‘ 1101 ’ 64QAM205/256 ‘ 1110 ’ 64QAM225/256 ‘ 1111 ’ 64QAM237/256

7 Fujitsu’s proposal MCS IndexCode RateMod OrderSpectral Efficiency

8 Simulation parameter settings ParametersValues Bandwidth10 MHz FFT size1024 Carrier frequency2.5 GHz Subframe structure18x6 CRU, according to the latest revision of IEEE 80216m-08/003r6 Channel ModelTU channel Mobile speed3 km/h Antenna configuration2x2, 4x4 Receiver algorithmMMSE Channel coding & modulation 16e 11 MCS & new MCS Channel estimationPerfect channel estimation HARQ scheme Synchronous HARQ with Chase Combining, Retransmission delay = 8 TTI with maximum 3 retransmissions and initial target PER of 10% CQI feedback period and delayEvery 8 TTI Scheduling methodPF Cell to cell distance500m BTS power46dbm Shadow fading8dB UE noise figure9dB Link adaptation methodRBIR for MMSE receiver and SISO

9 Proposed MCS table text for IEEE m AWD 15.x.1.3 –Table 15.x.1-1 MCS table for downlink and uplink data channel [TBD]