Open Source SDR Frontend and Measurements for 60-GHz Wireless Experimentation

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Ingénierie

Open Source SDR Frontend and
Measurements for 60-GHz Wireless
Experimentation
Laureando:
Andrea Driutti
Relatore:
Prof. Massimiliano Comisso
Anno accademico 2019-2020
Dipartimento di Ingegneria e Architettura
Corso di Laurea Triennale in Ingegneria Elettronica e Informatica
Curriculum Elettronica
Autori: Per Zetterberg,
Ramin Fardi
Informazioni di pubblicazione:
IEEE Access, March 30, 2015

Millimeter waves
Why?
1. Global bandwidth shortage facing wireless
carriers
2. 5G future applications
Differences
1. Larger communication bandwidths
2. Narrower beamwidths
3. Multi Gb/s
What?
Mm-waves refers to the frequency spectrum [30,300] GHz,
corresponding to wavelength of 10 to 1 mm.
Thus the mm-wave spectrum lies between the microwaves and infrared portions.
Relazione: 𝜆*f=c

Main goal
Experimentations in the 60-GHz wireless band
How?
Open Source SDR front-end design
model that
encourages open
collaboration
radio devices
based on software
instead of
hardware (USRP)
Universal Software Radio Peripheral
(USRP N210)
User-program
interface

Differences with other platforms
Disadvantages
1. indirect observation of the communication channel (throughput or RSSI)
2. not much experimentation on new interfaces
Open Source SDR Frontend design
Schematics, software
Hittite chips, FR4
SECTIONS
1. The front-end
2. Connection to USRP and other
platforms
3. Beamsteering
4. Measurements

1. The front-end
Target
Furnish specific details on the PCB
Design
• TX Board
• RX Board
• CLK Board
TX Board

USRP N210
How?
Through BasicRX and BasicTX boards
Hardware
TX-BasicTX and RX-BasicRX
Software
C++ classes, Matlab/Octave functions
2. Connection to USRP and other
platforms
OTHER PLATFORMS
Vector signal generator + spectrum analyzer

What?
It means changing the direction of the
main lobe (which contains the higher power)
to serve different users
3a. Beamsteering
Antenna beams
(normal behaviour)
Problem
Small size of the board (sidelobes ≅ mainlobes)
How?
Switching antenna elements
Changing phases of RF signals

Solution
Boards with multiple chips or
connected to an external antenna
3b. Beamsteering

4. Measurements
Why?
To characterize the performance of the
platform in different scenarios
Which?
1. Transmit power
2. Receiver sensitivity
3. Carriage leakage
4. Phase noise
5. MIMO 2x2
Power received by the spectrum analyzer

Conclusion
Open resources
• Software
• Measurements and instructions
• Hardware design files
• Files to control the board
Main utilization
• Demonstrate the usefulness of algorithms
• Proof of concept demonstrations

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