CDT Industrial mtg 27th July
LOS Throughput Measurements in Real-Time with a 128-Antenna
Massive MIMO TestbedPaul HarrisSiming Zhang, Mark Beach, Evangelos
Mellios, Andrew Nix, Simon Armour, Angela Doufexi, Karl Nieman,
Nikhil KundargiCommunication Systems and Networks Group University
of Bristol, Bristol, UK
http://www.bristol.ac.uk/engineering/research/csn/
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.1
SummarySystem Overview
Measurement Setup
Experimental Results
Conclusions
Ongoing Work2
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.The Massive MIMO Concept3
Ultimate Spatial ResolutionIncreased spectral efficiency and
network capacityAccurate spatial multiplexing
Time
Space
UplinkDownlinkUplinkUplinkUplinkDownlinkDownlinkDownlink
Cellular View
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.NI Based BIO Massive MIMO
test-bed4128 Programmable Radio Heads (4 racks of 32 radios)
TD-LTE like PHY (20 MHz BW)
1.2 6.0GHz Carrier (3.51GHz used)
Centralised MMSE, ZF and MRC/MRT MIMO Processing
Supports up to 12 User Clients (Full FPGA Processing)
24 user clients (decimated processing)
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Functional Overview5
Distributed FPGA Processing with PCIe links
Compact Computer
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Linear Decoding/Precoding
6
MGS Full QR Decomposition
Partial parallel systolic array
One detection matrix per 12 subcarrier resource block
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.MIMO ProcessorWide Data Path 128 x 12
Linear DetectorComputes 128 x 12 by 128 x 1 matrix vector multiply
in 160 ns24 Million times per second7
12 x 128128 x 112 x 1 32 x 1 (4) 12 x 32 (4)
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Frame Schedule
8
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Initial Indoor Deployment9
5.4m Linear Array with half-wavelength spacing
Client Separation 2.5 6
Equal and fixed UE Tx Gains
LOS Conditions
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Initial Indoor Deployment10
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.CDF Plots of SVS
11Scenario 1-3 in ascending order of LOS distance. 200ms capture
interval for 3 minutes. Averaged across frequency.
Exploitation of azimuth spreadClosest scenario is the worst for
32 elements
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
12Scenario 2 (12.5m Straight Line). 200ms capture interval for 3
minutes. Averaged across frequency and time.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Real-Time Channel Information13
Eigen StructureIndividual Spatial Stream Rx MagnitudePower Delay
profilesFrequency Domain profiles
Fading over the array caused by stairwell
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.12 Streams of 256-QAM
14
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.2nd Phase Deployment (11th May
2016)15
24.8m
3.51 GHz Patch Array24 UEs2.5 spacingPresented at SiPS 2016,
Dallas.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.22 User Gram Matrix
16
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.22 Streams of 256-QAMWith the same
frame structure as before this equates to 145.6 bits/s/Hz (uncoded
sum rate of 2.915 Gbps)
17
User InactiveUser Inactive
131 bits/s/Hz144 bits/s/Hz145.7 bits/s/Hz
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.ConclusionsAverage ratio of composite
channel gain to inter-user correlation observed to be 10 dB or more
for a ratio of up to 6:1 basestation antennas to users
Azimuth dominated array configurations could improve close range
LOS performance
18
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Ongoing Work19
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Acknowledgements and Thanks toPost
Graduate Students: Wael Boukley Hasan, Siming Zhang, Henry Brice
& Benny Chitambira
Academic Colleagues & post graduates at Lund University:
Steffen Malkowsky, Joao Vieira, Liang Liu, Ove Edfurs & Fredrik
Tufvesson
Academic Colleagues at Bristol: Mark Beach, Andrew Nix,
Evangelos Mellios, Angela Doufexi and Simon Armour
NI Staff: Karl Nieman, Nikhil Kundargi, Ian Wong, Leif Johansson
& James Kimery
20
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.Thank YouAny questions?
Communication Systems and Networks Group University of Bristol,
Bristol, UK http://www.bristol.ac.uk/engineering/research/csn/
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
IEEE Globecom, WCS.10: Channel Measurements and Modeling5th
December 2016, Washington D.C.
