Collaborative uplink MIMO techniques for IEEE 802 16
Collaborative uplink MIMO techniques for IEEE 802. 16 m IEEE C 802. 16 m-08/638 r 4 Document Number: IEEE C 802. 16 m-08/638 r 4 Date Submitted: 2008 -07 -14 Source: Mohamed Abdallah Mohammed Nafie Cairo University, Cairo, Egypt Re: IEEE 802. 16 m-08/024: Call for Contributions on Project 802. 16 m System Description Document (SDD) Uplink MIMO Abstract : This contribution proposes coding schemes to be included in the SDD Purpose: For discussion and approval by TGm Note: 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/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.
Collaborative MIMO IEEE C 802. 16 m-08/638 r 4 • Mobile stations (MS) can transmit at the same time in the same frequency – Improve system throughput by employing collaborate spatial multiplexing (CSM) • Rate 2 by using 2 BS ant. x 1 MS ant. configuration. (adopted by IEEE 802. 16 e) • Rate 4 by using 4 BS ant. x 2 MS ant. configuration. – Interference mitigation can be provided at the BS by • Proper selection of the MSs based on channel conditions. • Applying Precoding techniques at the MS.
Open Loop CSM IEEE C 802. 16 m-08/638 r 4 • 2 (M. S) x 4 (BS) OL collaborative spatial multiplexing (CSM) can achieve system throughput of rate 4 • Matrix A used at each MS • At the BS, the 4 streams can be separated given that the two MSs are chosen properly.
Closed Loop CSM IEEE C 802. 16 m-08/638 r 4 • Precoding techniques can be applied at the MS for the CSM. – Improve the performance of the CSM. • At each MS, a precoding 2 x 2 matrix V is chosen from a codebook such that the mutual interference at the BS is eliminated given a proper receiver. • Due to the limited power constraint at the MS – The precoding matrix V should limit the power transmitted per antenna.
Proposed SDD Text IEEE C 802. 16 m-08/638 r 4 • 11. x. x. MU MIMO – For open loop CSM mode, two MS with 2 transmit antenna can cooperate together by sending their data using matrix A to a 4 receive antennas at the BS. – For closed loop CSM mode, precoding is applied at each MS where the 2 x 2 matrix V is properly selected to separate the 2 streams of each MS efficiently at the 4 ant. BS.
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