Advanced Wireless Broadband Communications in Rural Areas Hajime Suzuki, Ngara Access Project Leader 13 June 2012 CSIRO ICT CENTRE
Summary Darwin
Brisbane
Perth Sydney Adelaide
Melbourne
Hobart
Optical Fibre
100 Mb/s
Fixed Wireless (LTE)
12 Mb/s
Satellite
12 Mb/s
Why there should be a difference in target data rates between cities and rural areas?
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Significant scientific and technical challenges to provide 100 Mb/s in rural areas by fixed wireless and satellite Advanced Wireless Broadband Communications in Rural Areas | Page 6
Significant scientific and technical challenges to provide 100 Mb/s in rural areas by fixed wireless and satellite Advanced Wireless Broadband Communications in Rural Areas | Page 7
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12/1Mb/s
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12/1Mb/s
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12/1Mb/s
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12/1Mb/s
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180/15Mb/s
12/1Mb/s
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180/15Mb/s 50/50Mb/s
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180/15Mb/s 50/50Mb/s
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10/10Gb/s 50/50Mb/s
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Ngara Access
10/10Gb/s 50/50Mb/s
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Ngara Access
10/10Gb/s 50/50Mb/s
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Ngara Backhaul
Ngara Access
10/10Gb/s 50/50Mb/s
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Ngara Backhaul
CSIRO’s WLAN Testbed Carrier: 2.4 GHz, 5.2 GHz, 40 GHz Bandwidth: 125 MHz Time resolution: 8 ns raw, 16 ns after filtering.
BER / FER measurement
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Basics of OFDM
Tx
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Rx
Basics of OFDM Tx
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Rx
Basics of OFDM Tx
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Rx
Basics of OFDM
1
1
0
1
0
0
110100110
110100110 1
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1
0
Basics of OFDM
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Coded OFDM Wireless LAN
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CSIRO’s 4x4 MIMO-OFDM Demonstrator
Multi channel transmitters
Multi channel receivers
World highest combination of data rate (600 Mb/s)
and spectrum efficiency (15 b/s/Hz) in 2005
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Basics of MIMO Rx
r1 r2
x1 x2
h12
rnr r1 r2 rnr
hij h11 h21 hnr 1
h12 h22 hnr 2
ij
e
j
h1nt h2 nt hnr nt
r Hx n Advanced Wireless Broadband Communications in Rural Areas | Page 28
x nt
ij
x1 x2 xnt
n1 n2 n nr
Tx
Basics of MIMO ZF
r Hx n
z = Wr = x + Wn
xˆiZF
arg min zi xˆi Q
Zero-Forcing Detection Advanced Wireless Broadband Communications in Rural Areas | Page 29
- 1
W = (H H) H H
xˆi
H
Example of MIMO-OFDM Device
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Multi-User MIMO Access Point
PHY 600 Mbps
PHY 600 Mbps
PHY 600 Mbps
PC A
PC B
PHY 600 Mbps
PC C
PC D
Each PC can only achieve up to 600 / 4 = 150 Mbps PHY Advanced Wireless Broadband Communications in Rural Areas | Page 31
Multi-User MIMO Access Point
PHY 150 Mbps
PHY 150 Mbps
PHY 150 Mbps
PC A
PC B
PHY 150 Mbps
PC C
PC D
Each PC can achieve 150 Mbps PHY (Tx needs to know the channel) Advanced Wireless Broadband Communications in Rural Areas | Page 32
Multiuser MIMO in Rural Area
GPS
GPS
GPS
GPS
GPS Advanced Wireless Broadband Communications in Rural Areas | Page 33
GPS
Basics of MU-MIMO Uplink AP
UT
Rx
r1 r2
h12
rnr r1 r2 rnr
x1 x2
hij
h11 h21 hnr 1
h12 h22 hnr 2
ij
e
j
x nt
ij
h1nt h2 nt hnr nt
r Hx n
x1 x2 xnt
n1 n2 n nr
Basics of MU-MIMO Uplink ZF Detection
r Hx n
z = Wr = x + Wn
xˆiZF
arg min zi
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- 1
W = (H H) H H
xˆi Q
xˆi
H
Basics of MU-MIMO Downlink UTs
r1 r2 Rx
x1 x2
h12
rnr r1 r2 rnr
hij h11 h21 hnr 1
AP
h12 h22 hnr 2
ij
e
j
h1nt h2 nt hnr nt
r Hx n Advanced Wireless Broadband Communications in Rural Areas | Page 36
x nt
ij
x1 x2 xnt
n1 n2 n nr
Tx
Basics of MU-MIMO Downlink ZF Precoding
r Hx
n x
r
r
1
r
x n
x
n
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1
Wx
HW
I
1st Stage Ngara Access Demonstrator
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1st Stage Ngara Access Demonstrator Parameters • MU-MIMO-OFDM with 6 users and 12 access point antennas • Carrier frequency
641.5 MHz
• Operational bandwidth
7 MHz
• Number of occupied sub-carriers
1705
• Number of data sub-carriers
1680
• Sub-carrier spacing
8 MHz / 2048 3.9 kHz
• OFDM symbol duration (without guard interval) • Cyclic prefix
• OFDM symbol modulation
256 s 64 s
64 QAM
Six User MU-MIMO-OFDM Uplink in Rural Area, 20 bits/s/Hz
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1st Stage Ngara Access Demonstrator Field Trial
ABC news clip
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Adaptive PtoMP Backhaul Project Proposal | Hajime Suzuki | Page 42
Adaptive PtoMP Backhaul Project Proposal | Hajime Suzuki | Page 43
Adaptive PtoMP Backhaul Project Proposal | Hajime Suzuki | Page 44
Adaptive PtoMP Backhaul Project Proposal | Hajime Suzuki | Page 45
Access Point Antenna Array
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AP 12 Element Antenna Array
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Adaptive PtoMP Backhaul Project Proposal | Hajime Suzuki | Page 48
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MU-MIMO-OFDM Downlink Demonstrator AP Antenna Array and Hardware Units
MU-MIMO-OFDM Downlink Demonstrator UT Antenna
1st Stage Ngara Access Real-Time Uplink / Downlink Demonstration
Adaptive PtoMP Backhaul Project Proposal | Hajime Suzuki | Page 54
2nd Stage Ngara Access Demonstrator Parameters • MU-MIMO-OFDM with 12 users and 24 access point antennas • Carrier frequency • Operational bandwidth
638 MHz / 806 MHz 14 MHz per downlink/uplink
• Number of occupied sub-carriers
3456
• Number of data sub-carriers
3348
• Sub-carrier spacing
8 MHz / 2048 3.9 kHz
• OFDM symbol duration (without guard interval) • Cyclic prefix
• OFDM symbol modulation
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256 s 64 s
64 QAM
2nd Stage Ngara Access Demonstrator Access Point
2nd Stage Ngara Access Demonstrator User Terminal
Adaptive PtoMP Backhaul Project Proposal | Hajime Suzuki | Page 58
2nd Stage Ngara Access Demonstrator 18 user MU-MIMO-OFDM uplink and downlink using offline processing successful in laboratory environment, 67 bits/s/Hz spectrum efficiency. 14 user MU-MIMO-OFDM uplink using real-time signal processing successful in laboratory environment, 51 bits/s/Hz spectrum efficiency. Planned minimum 12 user MU-MIMO-OFDM uplink/downlink using real-time signal processing by mid July 2012.
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Summary Darwin
Brisbane
Perth Sydney Adelaide
Melbourne
Hobart
Acknowledgement Alex Grancea radio design Andrew Hellicar project manager (2009-10) Arivoli PHY firmware design Boyd Murray system design Carl Holmsby mechanical design Chang Kyung Sung system concept Craig Russel application design David Humphrey firmware architect David Moreland firmware algorithm Douglas Hayman system concept David Robertson project manager (2010-) Frank Ceccato electrical testing Hajime Suzuki project leader Iain Collings lab director Ivan Kekic mechanical design Jay Guo theme leader Jayasri Joseph PHY firmware design John Matthew MAC firmware design Joseph Pathikulangara DSP hardware
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Juan Tello Keith Bengston Ken Smart Kevin Anderson Les Komarek Nipun Bhaskar Ren Liu Rob Shaw Rod Kendall Steve Barker Steve Broadhurst Tony Cantoni Wei Ni Zhuo Chen
mechanical design system design radio testing radio design radio control design firmware design network analysis radio design PHY firmware design RF systems team leader mechanical design external expert advisor system concept system concept
Science and Industry Endowment Fund Broadcast Australia Circular Head Council Australian Communications & Media Authority Arrayware
Publications Journal paper – I. B. Collings, H. Suzuki, and D. Robertson, “Ngara broadband access system for rural and regional areas,” Telecommunications Journal of Australia, vol. 62, no. 1, Feb 2012 Technical report – Smithton Field Trial (trial date Dec 2010, publication date Feb 2011) Technical Report – http://www.csiro.au/resources/Ngara-Smithton-trial-report.html Patent application – H. Suzuki, D. Hayman, J. Pathikulangara, I. B. Collings, and Z. Chen, “Highly spectrumefficient fixed wireless multiple access,” International Application No PCT/AU2009/101022, August 2009 – H. Suzuki, J. Pathikulangara, and D. Humphrey, “Multi-user MIMO-OFDM communication system,” Australian Application No 2010903932, September 2010
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Publications H. Suzuki, D. Robertson, N. L. Ratnayake, and K. Ziri-Castro, “Prediction and measurement of multiuser MIMO-OFDM channel in rural Australia,” IEEE Vehicular Technology Conference, May 2012 H. Suzuki, J. Pathikulangara, and D. Humphrey, “Solving user-symbol specific phase offset problem for multiuser MIMO-OFDM fixed uplink,” IEEE Asia-Pacific Microwave Conference, Dec 2011 N. Ratnayake, K. Ziri-Castro, and H. Suzuki, “Time variation effects of weather conditions in rural MUSA-MIMO-OFDM channels,” Loughborough Antennas and Propagation Conference, November 2011 A. Hellicar and H. Suzuki, “Circular arrays for SDMA communication system,” European Conference on Antennas and Propagation, April 2011 N. L. Ratnayake, K. Ziri-Castro, and H. Suzuki, “Deterministic diffraction loss modelling for novel broadband communication in rural environments,” Australian Communications Theory Workshop, January 2011 H. Suzuki, D. B. Hayman, J. Pathikulangara, I. B. Collings, Z. Chen, and R. Kendall, “Design criteria of uniform circular array for multi-user MIMO in rural areas,” IEEE Wireless Communications and Networking Conference, April 2010
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