Software Radio Course


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Presentation on the software radio course and platform by Dr. Kalle Ruttik

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Software Radio Course

  1. 1. A! “Software Radio” course Special session SNhANCE Study Tour Kalle Ruttik Department of Communications and Networking School of Electrical Engineering Aalto University
  2. 2. A! Content  Course information  Background, target group …  Course structure  Content of the course  Gnu radio platform  Research projects around the used platform  Demo
  3. 3. A! History of the course  ”Software radio” is a new laboratory works based course that is introduced in fall 2013  Current bachelor level laboratory works are build for illustrating and validating the communication theory  It repeats the content of “theory” courses  New laboratory works course  Strengthen students software skills  Build a bridge between communication theory and programming  Show how to apply theory in practice
  4. 4. A! Basic courses (70 op) Aalto-studies + obligatory (10 op) Program defines(60 op) Major (60 op) Program main course Degree program subject related courses Bachelor degree (10 op) Minor (25 op) Elective (25 op) Bachelor degree • Basic studies (70 op) - Aalto-courses + obligatory courses - Courses definded by the program • Major (60 op) - Basic courses of the program - Bachelor thesis (10 op) • Minor (25 op) - Minor subject courses offered by schools of Aalto. • Elective courses (25 op) - Additonal course in major and minor subject - Strengthening minor (mobility) - Short minor 4
  5. 5. A! Information theory (IT), major 60 cr Elective studies, Special courses (25 cr) Select 5 courses: • Applied signal processing 5 cr (SA) • Random processes in telecommunications 5 cr (SA) • Basics of Internet technology 5 cr (TLV) • Application programming 5 cr (TLV) • Transmission methods 5 cr (TLV) • Software radio (Ohjelmistoradio) 5 cr (TLV) • Bachelor thesis and seminar 10 op • Basics of information theory, 5 cr (TLV+SA) • Basics of automatics and system analysis, 5 cr (AS) • Information theory, 5cr (TLV) • Digital signal processing and filtering, 5 cr (SA) • Modeling and analysis of communication networks, 5 cr (TLV) • Elective studies 25 op
  6. 6. A! Elective courses 25 CR •Basics of information theory, 5 cr (TLV) •Information theory, 5cr (TLV) •Digital signal processing and filtering, 5 cr (SA) •Modeling and analysis of communication networks, 5 cr (TLV) •Signals and systems (TLV) 5 cr •Applied signal processing 5 cr (SA) •Random processes in telecommunication 5 cr (SA) •Basics of Internet technology 5 cr (TLV) •Application programming 5 cr (TLV) •Transmission methods 5 cr (TLV) •Software radio (Ohjelmistoradio) 5 cr (TLV) Information theory (IT), minor 25 cr
  7. 7. A! Background information  The course belongs into bachelor degree program of Communication engineering  Course combines theory and experiments  About 50 -60 students per year  Prerequisites  “Signals and Systems”  “Transmission methods”  The laboratory works also explores and explains system level issues not treated in any other bachelor level course in our curriculum.
  8. 8. A! The structure of the course
  9. 9. A! Educational aspects of laboratory works  Learning outcomes specific to Laboratory works  experimental skills  real world experience  experience for constructing actual systems  discovering the results predicted by the theory  familiarization with equipments  motivation due to the clear practical results  teamwork  networking with outsides, searching information from different sources and contacts  communication skills.  Broader educational targets  investigation of a phenomena  practicing problem solving skills  practicing inquiring about the phenomenas.
  10. 10. A! Observed problems with laboratory works  Course organization related problems  Students have different studying styles,  strict instructions vs “playing around” with equipments  Course assessment related problems  Students drive to get “right answers”  Too much freedom does not lead to good learning  Need of feedback from “authority”  Practical experiments implementation related issues  The course too extensive, too much time spend on practical measurements  The equipments are not reliable  Student groups may malfunction
  11. 11. A! Challenges  Mismatch between the teacher intention and students perception of the experimental work targets  Students just measure and do not understand what is going on  Provide experiments with open ended questions  Students tend to follow only the measurement instructions  Use wider set of assessment methods  Not only assessments on measurement reports
  12. 12. A! Guidelines  Plan inquiry type laboratory exercises  Balance between the type of experiments  Open ended questions  Strict instructed measurements  Balance between the work in small groups and larger class based events
  13. 13. A! Structure of a lab work  Preliminary exercises  Student learn the background material  First class  Students plan the measurements  Laboratory measurements  Done in two person teams  Measurements can be done during certain days, no strict time limits  Follow up class  Analysis of the experiment results  What was done, what can be concluded
  14. 14. A! Teaching objectives  Transceiver related topic  After this course, you know how a radio transceiver is constructed. You understand how the practical receiver differs from the theoretical models. You know how to model a non-ideal transceiver and how to measure the errors produced by the non- ideal behavior of the transceiver.  Software project  You understand the structure of a software project and you are able to participate in a large software project with multiple programmers. You know the basics of problem solving methods and you are able to apply those methods in your own projects.  Communication systems related issues  You understand what the interference is. You can predict how the interference impacts radio links and radio communication systems in general.
  15. 15. A! Core content Complementary knowledge Specific knowledge Scientific skills Measurements: planning, implementation and analyze. Modeling of radio systems. Modeling and analyzing of errors Interference concept and modeling. Problem solving strategies. Impact of radio environment and transceiver implementation errors on a design of a radio system. Professional skills Programming of radio transceivers. Software management with version control systems. Testing of software radios Knowledge about measurement equipments use in testing of radio systems. How large are the errors in existing systems.
  16. 16. A! Course structure  The course contains four laboratory works and an independent project. The laboratory works use software radios that are implanted by using the universal software radio platform (USRP) and GNU-radio framework.  During the course, the students study the performance of the software radio transceiver. They learn how the radio performance is described and how it is measured.  By using GNU-radio as an example, students learn how to structure a software project, how to handle version control and how to create and add new functions to the software based transceiver chain.
  17. 17. A! Topics of the lab exercises  Study of a transceiver chain  Visualizing the theory taught on previous theory courses  Tranceiver performance measurements  Learning about non-ideal behavior of the  Radio communication system measurements  Interference and its impact  Software project management  Cooperation with other programmers and software version control  Learning problem solving methods  Problem solving strategies and their use in small personal project
  18. 18. A! Assessment method  Assessment based on the reports per group  2 person groups  Preliminary exercises: 30 points  Measurement plans: 20 points  Measurement reports: 50 point
  19. 19. A! Students workload Laboratory work Load Introduction to a transceiver chain 25 h Transceiver performance measurements 25 h Interference in a radio environment 25 h Implementing a function for a software radio 25 h Independent project 33,5 h One labwork Load Preliminary exercises 10 h Contact teaching 2 h Measurements 3 h Measurements reports 10 h
  20. 20. A! Workload  Lectures/contact hrs 0 h  Exercise/contact hrs 0 h  Laboratory works hrs 40 h  Independent study 90 h  Examination 0 h
  21. 21. A! Teachers workload In a week Total Teacher 24 h 108 h Assistent 21 h 84 h Teacher  Preliminary reports: 1x20 min total 30x20 10 h  Measurement reports: 1x20 min total 30x20 10 h  Lectures: 4x2 = 8 h  Preparation for a lectures 4x2 = 8h  Independet project: 2+4 h seminar time Assistant  Prearation for labworks: 4x3 = 12 h  Measurements: 4 x 18 = 72 h
  22. 22. A! Content of individual labworks  How the ”analog” equations are implemented in digital computers  Each laboratory work contains  Communication theory  Software radio implementation related issues  Software radio development process
  23. 23. A! Topics of the lab exercises  Study of a transceiver chain  Visualizing the theory taught on previous theory courses  Transceiver performance measurements  Learning about non-ideal behavior of the  Radio communication system measurements  Interference and its impact  Software project management  Cooperation with other programmers and software version control  Learning problem solving methods  Problem solving strategies and their use in small personal project
  24. 24. A! Lab1: Transceiver chain  Communication theory  3dB bandwidth, signal power measurements, SNR estimation  FM modulation  OFDM transmission  Students plan: AM and FM signal SNR measurements  Software radio implementation  Students will look and comment on implementation of software radio blocks  Code development process  Read and comment on GNU radio development process eConcepts
  25. 25. A! Transceiver performance measurements  Communication theory  Signal constellation and Error Vector magnitude (EVM)  SINR estimation by using EVM, SNR estimation from signal power.  BER measurements  Student planned measurements: Transmitter linearity estimation and measurements  Software radio: adding and compiling a new block  Gr-modtool: Students compile their own block  Doxygen  Using doxygen for documenting the code
  26. 26. A! Radio communication system measurements  Communication theory  Interference: co-channel, adjacent channel  Channel coding gain  Students planned measurements: Pathloss and attenuation in the radio channel  Software radio  Students add functionality to a ready software radio block.  Noise generation block: adds noise to the input signal  Code development process  Coding style quide  de_impl
  27. 27. A! Software project management  Communication theory  Generation and using of CRC  Software radio  Test driven programming  Code development process  Using git version control system for managing the code
  28. 28. A! Learning problem solving methods  Individual project where the students have to use the learned skills  Review of problem solving strategies  Students have to document their problem solving process and describe each step in the light of the problem solving strategies
  29. 29. Platform
  30. 30. A! Transceiver Tx software Running PC USRP Rx software Running in PC USRP Air interfaceTransmitter Receiver
  31. 31. A! Our System
  32. 32. Software
  33. 33. A! Software with USRP  Support software  NI Labview   MathWorks   GNU radio
  34. 34. A! GNU radio  GNU radio is an open source software development kit  Hierarchical structure  High level blocks in Python  Signal processing in C++  Primary a simulation tool.
  35. 35. A! Gnu radio  Software radio  Core concept of GNUradio alsCoreConcepts  Beginners guide oUse  Tutorial of how to write a new block TreeModules
  36. 36. A! Under active development  Academic papers from GNU radio webpage ine/projects/gnuradio/ wiki/AcademicPapers
  37. 37. Hardware USRP
  38. 38. A! Hardware
  39. 39. A! USRP
  40. 40. A! RF daughterboards xcvr2450  2.4-2.5 GHz and 4.9-5.9 GHz  Half Duplex Only  TX output power  100 mW  Single synthesizer shared between Rx and Tx  RSSI measurement that can be read from software SBX  400 MHz to 4.4 GHz  TX output power  16 to 20 dBm,  with 32dB of power control range  Dual synthesizers for independent Tx and Rx  NF  < 3GHz: 5-7 dB  3 – 4 GHz: 7 -10 dB  4 – 4.4 GHz: 10 – 13 dB
  41. 41. A! Devices linearity 0 0.2 0.4 0.6 0.8 1 -80 -60 -40 -20 0 20 Input level MeasuredOutputPower[dBm] USRP2 N200 Ouput im3 0 0.2 0.4 0.6 0.8 1 -80 -60 -40 -20 0 20 Input level MeasuredOutputPower[dBm] USRP2 N200 Ouput im3
  42. 42. A! Linearity II input 0.1 USRP2 N200
  43. 43. A! USRP related research  Radio transmission in TV white/black space  Y. Beyene “TV Black-space Spectrum Access for Wireless Local Area and Cellular Networks”, master thesis, Aalto.  Performance study of overlay transmission on TV signal Y. Beyenne, K. Ruttik, R. Jäntti, “Effect of Secondary transmission on Primary Pilot Carriers in Overlay Cognitive Radios”, submitted to CrowCom 2013.  H. Tewodros, “Testing a Simple Algorithm for LTE Synchronization and Cell Search”, master thesis, Aalto.  Study of the impact of delay on overlay transmission • Synchronization schemes for cognitive BS K.G. Vishnu, “Network Time Synchronization in Time Division - LTE systems”, diploma thesis Feb.2013. • Implementation of the time synchronization in TDD network • MIMO transmission in USRP platform G.C. Moreno, “Communication over USRP by using multiple antennas”
  44. 44. Thanks