1 Uplink MIMO Proposal for IEEE 802.16m Document Number: S80216m-08/744 Date Submitted: July 16, 2008 Source: shaohua Nokia Siemens.

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1 Uplink MIMO Proposal for IEEE m Document Number: S80216m-08/744 Date Submitted: July 16, 2008 Source: shaohua Nokia Siemens Peter Wang Qi xin Kang jianfeng Wei chao Zexian Li Venue: IEEE m-08/024 “Call for Comments and Contributions on Project m System Description Document (SDD)” in response to the following topic: “Uplink MIMO” Base Contribution: IEEE C802.16m-08/744 Purpose: Discussion and Approval 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.

2 Outline Design Criteria and Requirements MIMO Architecture Single-user MIMO Collaborative MIMO CSI acquired for UL MIMO Conclusions and Recommendations SDD Text

3 Design Criteria and Requirements Improve coverage and increase the throughput Low system complexity and lower power consumption Support limited antenna configuration ½ lambda (1 or 2 Tx for each mobile)

4 MIMO Architecture Notation: Only SCW is supported When only one transmit antenna is configured, MIMO encoder and precoder are not present in the above figure.

5 Single-user MIMO Open-loop –antenna Hopping Antenna hopping is simple in transmitter. It only needs few RFs, but antenna switch is necessary. It will cause some power imbalance. –STBC/SFBC/SM STBC/SFBC can get better performance compared with antenna hopping –CDD+STBC/SFBC/SM It is not suitable to be used due to the limit number of transmit antennas. Closed-loop –Antenna selection With antenna selection, fewer RFs are needed, but antenna switch is still needed. –precoding Good performance Precoding based on unitary codebook has good power balance property. We propose to use STBC/SFBC/SM and precoding based on unitary codebook for OL/CL to improve the performance.

6 Collaborative MIMO Closed-loop –linear precoding can be used The mapping from the steams to transmit antennas can be defined using z = Px P : Nt x Mt weighting matrix x: Vector with the output from the space-time coding Nt: The number of actual transmit antennas Mt: The number of streams at the output of the space-time coding scheme. –P is signaling by BS Open-loop –Transmission mode is decided by BS, and P may be used and it can be determined by MSs based on preamble and common pilots for TDD system. Constraint on Collaborative MIMO –In the same resource unit (RU), the number of streams, Mt, shall be same for collaborative users

7 CSI acquired for UL MIMO For TDD frame structure –CSI can be acquired based on Downlink preamble and common pilots –CSI can also be acquired by uplink sounding, and it is signaling by BS based on unitary codebook For FDD frame structure –Unitary codebook is used for signaling CSI information

8 Conclusion

9 SDD text Please refer to C80216m-08_744.doc