mmwave testbeds and prototypes...ni.com mmwave testbeds and prototypes opportunities and challenges...
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ni.com
mmWave Testbeds and PrototypesOpportunities and Challenges
Ian C. Wong, Ph.D.
Senior Manager, Advanced Wireless Research
Challenges to mmWave Prototyping
Hardware
Performance
Flexibility/Scalability
Availability
Cost
Software
Skills gap / learning curve
Training and support
Longevity
Real-time reference design availability
NI mmWave Transceiver System (MTS)
MTS
• 2 GHz Real-
Time Bandwidth
• SISO & MIMO
• Modular BB, IF,
mmWave
• Frequency
options: 28GHz,
73GHz, 60GHz
Shipping LU Availability
NR Phase 1 IP
<40GHz
• CP-OFDM V5G
& NR
• 8x100MHz
Component
Carriers
• SISO & MIMO
• 3rd Party
Phased Array
• Bidirectional
TDD
Shipping
LabVIEW
• Unified ADE
for X86 &
FPGA
• Increased
abstraction for
rapid
development
• 3rd party
integration
LU Availability
NR Phase 2 IP
>40GHz
• Single Carrier
• 2 GHz Real-
Time Bandwidth
• Supports 2x2
MIMO
• Fully
Bidirectional
TDD Uplink &
Downlink
Modes
Partner Solution
Channel Sounding
• AOA/AOD,
Doppler
Spread, CIR
etc..
• Flexible
Configuration
• Leverages
MTS HW
MTS Configurations28GHz mmWave Head 60GHz SiBeam
RFIC
E-Band Custom Front – End
RFIC or Head
Frequency Coverage 27.5-29.5GHz 60.48GHz
62.64GHz
71 – 76GHz Customer Defined
BW 2GHz 1.76GHz 2GHz 2GHz BB BW
BB/IF Configuration BB with IF Stage BB IQ Only BB with IF Stage BB with IF Stage
BB Only
Head Type TX / RX/ TRX RFIC Transceiver TX / RX Customer Defined
Antenna Type Coax Connectivity
3rd Party Horns or
Phased Array
12x12 Phased Array Waveguide WR-12
3rd Party Horns or
Phased Array
Customer Defined
MIMO Order 2x2 or Higher SISO Only 2x2 or Higher Customer Defined
SW Options 2 GHz Single Carrier, 800 MHz OFDM, Channel Sounding
Notes High Performance
mmwave Head
Analog Beam
Forming in IC
High Performance
mmwave Head
IF: 8.5 to 13.5GHz
ADC/DAC
3.072GS/s
Availability Today Today (Limited) Today Today (custom)
Systems and Subsystems:
So Much to Measure
2
mmWave
Transistor and
NL-Device
Measurements
mmWave Signal
Characterization
Channel
Measurement
and Modeling
Massive MIMO
and Over-the-Air
Test
The Measurement Elephant in the Room
3
On-Wafer to OTA – No connectors to test:• Efficiency
• Distortion
• Troubleshooting stages
What is the answer??
Some Questions for Discussion
Devices and Materials:
What are prospects for large-signal network analysis at mmWave frequencies?
What are issues tuning mmWave harmonics?
What is the role of materials measurements in future wireless?
Signal characterization:
How to handle issues with cascading non-ideal, distortion-inducing instruments (similar to Additive EVM)?
How do you see the role of traceability in waveform measurements?
Channel measurements:
Why is it more important to decouple the antenna from the channel measurement?
Will errors in channel sounders be more important at mmWave frequencies?
Antennas and Massive MIMO:
How does one generate a known test field for multiple-element antenna arrays?
What is the role of statistics in testing arrays that operate in more states than you can count?
What are issues with distributed array timing and synchronization?
The Elephant in the Room:
How to merge on-wafer and OTA test to verify performance?
4
mmWave Testbeds
Robb Shimon, PhD
TLO Signal Conditioning Strategy
19 Jul 2017
Page
New Radio Design
cabled / OTA test
environment
UE / BS design
NR specifications
channel model
– NR < 6GHz: good channel models, cabled testing
– NR at mmWave: need OTA, but what are requirements?
© Keysight Technologies, Inc 2
Page
mmWave OTA Challenges
RF demod RRM
measurementsin-band and out-of-band
signal characteristicsthroughput
search, acquisition, tracking,
handoff, …
channel model basic, line of sight 3D spatial3D spatial, multi-signal,
dynamic
challenges
radiated requirements?
• frequency bands
• number of CA combinations
• UE: 3D rotation
• UE: head/hand blocking
• …
no baseline
measurement system
• accuracy of channel model?
• generation of verifiable
spatial fields?
no baseline
measurement system
© Keysight Technologies, Inc
– mobility and the challenge of directional antennas
• learn to stand – fixed wireless
• learn to walk – low-speed mobility
• learn to run – high-speed mobility
3
Page
mmWave OTA Testbeds
1. Understand the spatial characteristics of the mmWave propagation channel.
• Do we?
2. Determine performance characteristics of testbed.
• Characterization or emulation?
• Use cases?
3. Design a dynamic, interoperable testbed.
• Interfaces: world-hardware, hardware-software, software-user?
• Calibration?
• Protect IP, yet ability to ‘share’ results?
4. Implement the design.
• Industry-academia partnership?
• Custom or COTS?
© Keysight Technologies, Inc 4
Page
Keysight 5G Testbed
© Keysight Technologies, Inc
89600 VSA softwareSignal Studio software
Signal Optimizer software
SystemVue ESL software
phased-array beam-forming kit
5
Page
Demonstration 32-Element 5G Phased Array
© Keysight Technologies, Inc
Prof. Rebeiz, U. California, San Diego
Key Performance Characteristics:
• 3 GHz Instantaneous Bandwidth
• 1.6 Gb/s at 300 m demonstrated*
• 1.0 Gb/s at +/- 50 degree E-Plane*
• Supports up to 256 QAM for 6 Gb/s*
IC Fabrication Provided by TowerJazz
* Results without FEC or Equalization
6
Page
Demonstration 64-Element 5G Phased Array
© Keysight Technologies, Inc
Anokiwave and Ball Aerospace
7
60 GHz Software Radio Platforms for Prototyping
mmWave Networking/Sensing Systems
Xinyu Zhang
Assistant Prof.@UW-Madison Associate Prof.@UC San Diego
http://xyzhang.ece.wisc.edu/wimi
Open-source 60 GHz mmWave software-radios
1 GHz
57-64GHz
horn/phased-array
$15k-20k
OpenMili, 2016
Baseband BW
Carrier freq
Antenna
Cost
245 MHz
57-64GHz
horn
$25k
WiMi, 2014 OpenMili 2.0,
expected 2017
100 MHz or 1 GHz
57 GHz-64 GHz
< $10k
phased-array
Check: http://xyzhang.ece.wisc.edu/wimi
OR Google: 60 GHz software radio
OpenMili phased-array
Transition
Power
divider
network
Phase-shift
network
Microstrip patch
antenna array
11mm
UCSD’s 32-element phased-array (60 GHz)
2×2 TRX
Chip
Bias/
digital
control
Antenna
feeds
2:1 Wilkinson
4:1 Wilkinson
5 mm (0.5 λ)
6.3 mm
(0.63 λ)
1 cm
(From: Prof. Gabriel Rebeiz)