Collaborative uplink MIMO techniques for IEEE 802.16m
Document Number:
C80216m-08/638r2
Date Submitted:
2008-07-07
Source:
Mohamed Abdallah
Mohammed Nafie
Cairo University, Cairo, Egypt
Venue:
IEEE 802.16m-08/024 “Call for Contributions on Project 802.16m System Description Document (SDD)”, In response to the following topics:
“Uplink MIMO schemes”
Session #56: Denver, USA
Target topic: .
Uplink MIMO.
Base Contribution:
C80216m-08/638
Purpose:
For discussion and approval by IEEE 802.16m group.
Notice:
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.
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• 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 802.16e)
• 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.

A
 
1

• Precoding techniques can be applied at the MS for the
CSM.
– Improve the performance of the CSM.
• At each MS, a precoding 2x2 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.

– 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 2x2 matrix V is properly selected to separate the 2 streams of each MS efficiently at the 4 ant. BS.