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Submission doc.: IEEE 11-13/1440r0 November 2013 Clayton Shepard, Rice UniversitySlide 1 Argos | Practical Massive-MIMO Date: 2013-11-12 Authors:

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Presentation on theme: "Submission doc.: IEEE 11-13/1440r0 November 2013 Clayton Shepard, Rice UniversitySlide 1 Argos | Practical Massive-MIMO Date: 2013-11-12 Authors:"— Presentation transcript:

1 Submission doc.: IEEE 11-13/1440r0 November 2013 Clayton Shepard, Rice UniversitySlide 1 Argos | Practical Massive-MIMO Date: Authors:

2 Submission doc.: IEEE 11-13/1440r0 November 2013 Clayton Shepard, Rice UniversitySlide 2 Abstract We present a practical architecture for massive-MIMO and show early results from a real-world prototype. We suggest a small modification to ac to enable implicit channel sounding, which is critical for the practicality of massive-MIMO.

3 Submission doc.: IEEE 11-13/1440r0 Clayton Shepard, Rice UniversitySlide 3 Massive-MIMO Benefits Huge improvements in spectral capacity Reduced inter-AP interference Reduced STA power Increased range November 2013

4 Submission doc.: IEEE 11-13/1440r0 Clayton Shepard, Rice UniversitySlide 4 Scalability Challenges 1)Acquire CSI M pilots, then MK feedback 2)Calculate Weights O(MK 2 ), non-parallelizable, centralized data 3)Apply Linear Precoding O(MK), then O(M) data transport November 2013

5 Submission doc.: IEEE 11-13/1440r0 Argos’ Solutions Slide 5Clayton Shepard, Rice University November )Acquire CSI New reciprocal calibration method 2)Calculate Weights Novel distributed beamforming method 3)Apply Linear Precoding Carefully designed scalable architecture O(MK) → O(K) O(MK 2 ) → O(K)* O(MK) → O(K) * Ref: [1]

6 Submission doc.: IEEE 11-13/1440r0 Argos Architecture Clayton Shepard, Rice University November 2013 Slide 6

7 Submission doc.: IEEE 11-13/1440r0 Argos Implementation Slide 7Clayton Shepard, Rice University November 2013

8 Submission doc.: IEEE 11-13/1440r0 Clayton Shepard, Rice University November 2013 Slide 8

9 Submission doc.: IEEE 11-13/1440r0 9 WARP Modules Central Controller Argos Hub Clock Distribution Ethernet Switch Sync Distribution Argos Interconnects Clayton Shepard, Rice University November 2013

10 Submission doc.: IEEE 11-13/1440r0 Slide 10Clayton Shepard, Rice University November 2013 Ref: [3]

11 Submission doc.: IEEE 11-13/1440r0 Clayton Shepard, Rice University November 2013 Slide 11

12 Submission doc.: IEEE 11-13/1440r0 ArgosHub Slide 12Clayton Shepard, Rice University November 2013

13 Submission doc.: IEEE 11-13/1440r0 ArgosMobile Clayton Shepard, Rice University November 2013 Slide 13

14 Submission doc.: IEEE 11-13/1440r0 Results Without Considering Overhead CE Transmit Comp Clayton Shepard, Rice University November 2013 Slide 14

15 Submission doc.: IEEE 11-13/1440r0 Capacity vs. AP Antennas with 15 STAs Linear Gains as # AP Antennas Increases Clayton Shepard, Rice University November 2013 Slide 15 Ref: [1]

16 Submission doc.: IEEE 11-13/1440r0 Capacity vs. # of STAs, 64 AP antennas Linear Gains as # of STAs Increases Clayton Shepard, Rice University November 2013 Slide 16

17 Submission doc.: IEEE 11-13/1440r0 Capacity vs. # of STAs, 16 AP antennas Scaling # of STAs with 16 AP Antennas Clayton Shepard, Rice University November 2013 Slide 17

18 Submission doc.: IEEE 11-13/1440r0 Zero-forcing vs. Conjugate Slide 18 November GHz10 GHz Conjugate Adaptive Precoding Zero-forcing Faster Processing More Antennas or Higher Mobility Ref: [2] Clayton Shepard, Rice University

19 Submission doc.: IEEE 11-13/1440r0 Massive-MIMO in Slide 19Clayton Shepard, Rice University November 2013 TDD Low Mobility High Frequency (5.8 GHz) CSMA Expensive Large Form-Factor

20 Submission doc.: IEEE 11-13/1440r0 Current ac Sounding Slide 20Clayton Shepard, Rice University November 2013 NDPANDPA ackackCSICSI ackackCSICSI DataDataNDPNDP ackackCSICSI Rx A Tx Rx B Rx C Transmission Procedure 1.Select transmission group (NDPA) 2.Send channel sounding training sequence (NDP) 3.Receive channel state feedback (CSI) from each receiver serially 4.Construct steering weights and transmit data 5.Acknowledge transmission <<

21 Submission doc.: IEEE 11-13/1440r0 Modified Implicit Sounding Slide 21Clayton Shepard, Rice University November 2013 NDPANDPA ackackNDPNDP ackackNDPNDP DataData ackackNDPNDP Rx A Tx Rx B Rx C Transmission Procedure 1.Select transmission group (NDPA) 2.Group serially transmits implicit sounding training sequence (NDP) 3.Construct steering weights and transmit data 4.Acknowledge transmission

22 Submission doc.: IEEE 11-13/1440r n Implicit Sounding High-overhead Required inter-STA cooperation for calibration Slide 22Clayton Shepard, Rice University November 2013 Ref: [4,5,6,7]

23 Submission doc.: IEEE 11-13/1440r0 Conclusions Massive-MIMO can be practical Massive-MIMO requires implicit sounding to be feasible Implicit sounding is easily enabled in Slide 23Clayton Shepard, Rice University November 2013

24 Submission doc.: IEEE 11-13/1440r0November 2013 Clayton Shepard, Rice UniversitySlide 24 References [1] Clayton Shepard, Hang Yu, Narendra Anand, Erran Li, Thomas Marzetta, Richard Yang, Lin Zhong. "Argos: Practical Many-Antenna Base Stations," in Proc. ACM Int. Conf. Mobile Computing and Networking (MobiCom), August [2] Clayton Shepard, Narendra Anand, and Lin Zhong. "Practical Performance of MU-MIMO Precoding in Many-Antenna Base Stations," in Proc. ACM workshop on Cellular networks (CellNet), June [3] Clayton Shepard, Hang Yu, and Lin Zhong. "ArgosV2: A Flexible Many-Antenna Research Platform," Extended Abstract for demonstration in Proc. ACM Int. Conf. Mobile Computing and Networking (MobiCom), October [4] 04/1404r2, Enhancements for : Features and Performance, John Ketchum. [5] 04/1449r1, High-Throughput Enhancements for : PHY Supplement, John Ketchum. [6] 05/0414r1, Response to “No” Vote Comments on Calibration, John Ketchum. [7] IEEE n-2009 [8] 13/1046r1, Discussion on Massive MIMO for HEW, Zhigang Wen.


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