Uplink Training for Downlink Multi-User MIMO in IEEE 802.11-16/1264r1
"Explore the innovative approach of uplink training in DL MU-MIMO systems, addressing challenges of time consumption and beam accuracy. Learn about channel reciprocity calibration and efficient training procedures for enhanced performance."
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September 2016 Uplink Training for Downlink Multi-User MIMO Date: 2016-09-12 Authors: doc.: IEEE 802.11-16/1264r1 Name Dzevdan Kapetanovic Affiliations Address Ericsson Phone +46- 107146951 email dzevdan.kapetanovic@eri csson.com Mobilv gen 1 22 362 Lund Sweden Mobilv gen 1 22 362 Lund Sweden Mobilv gen 1 22 362 Lund Sweden bo.lincoln@ericsson.com Bo Lincoln Ericsson andres.reial@ericsson.co m Andres Reial Ericsson Submission Slide 1 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Introduction Training with Tx/Rx beam sectorization is the current training method for DL MU-MIMO in 802.11ay This method is transparent to any uplink-downlink channel differences Problems: time consuming (as much training as number of sectors), beam accuracy can be low (more accuracy -> more training overhead) This method is presented as Myth #3 in [1]: it does not exploit the full potential of Massive MIMO systems Submission Slide 2 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Introduction Alternative approach: perform uplink training Pros: Less training overhead, superior beam accuracy, not sensitive to LOS assumption Cons: UL/DL channel reciprocity not guaranteed -> possibly requires calibration Submission Slide 3 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Calibration for Channel Reciprocity AP has Tx and Rx chain gain imbalances ??? and ??? (diagonal matrices) ? AP calibration estimates ?????? AP calibration is well-known and well-studied, and it works [2] Calibration of STAs not necessary for DL transmission Submission Slide 4 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Uplink Training Procedure Assuming calibration has been performed 1. AP transmits an uplink training trigger frame to a specific group of STAs 2. Each STA in the group transmits a training packet 3. AP estimates (jointly) the received channel (or any transformation of the channel) 4. AP uses the estimated channel for downlink transmission Submission Slide 5 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Uplink Training Procedure Trigger Frame Beamformed Data Estimate CSI AP Training Packet STA 1 Training Packet STA 2 These packets are short! Submission Slide 6 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Massive MIMO Deployment (2.3 GHz) 0.5 m between UEs, 40-50 m between BS and UE, 8 m linear array Submission Slide 7 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Performance TDD significantly better than hybrid beamforming and FDD Submission Slide 8 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Summary Proposed an uplink training procedure for beamforming construction Pros: Significantly less training overhead, enables superior beamforming Cons: Possibly calibration assumptions (although verified in practice to work) Submission Slide 9 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 References [1] E. Bj rnsson, E. G. Larsson, T. Marzetta, Massive MIMO: Ten Myths and One Critical Question , IEEE Comm. Mag., Feb. 2016 [2] J. Vieira et. al., Reciprocity Calibration for Massive MIMO: Proposal, Modeling and Validation , IEEE Trans. Wire. Comm., 2016 Submission Slide 10 Dzevdan Kapetanovic et al., Ericsson
September 2016 doc.: IEEE 802.11-16/1264r1 Straw Poll Do you believe the uplink training mechanism presented here is worth considering for further study? Y/N/A: Submission Slide 11 Dzevdan Kapetanovic et al., Ericsson
