Aalto University School of Electrical Engineering. ELEC-E4750 Radiowave Propagation and Scattering Session 1: Prerequisite

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1 ELEC-E4750 Radiowave Propagation and Scattering Session 1: Prerequisite ELEC-E

2 Course Implementation Responsible teacher: Katsuyuki Haneda, teachers: Usman Virk and Suzan Miah The course is organized in 12 topics, one topic per week All face-to-face sessions are devoted to help students learn through solving exercises There are threshold Students submit exercise solutions in MyCourses deadlines, which is set once or on a paper and discuss with a teacher in every four-week Tuesday sessions, 14:15-16:00 Two exercise problems and reading materials introduced for a new topic; motivation session If a student is done with a topic earlier than the deadline, they can proceed to the next topic Thursday sessions, 12:15-14:00 A Clicker lecture given by the teacher concerning the new topic and exercise problems Before the threshold deadlines, students fill in self-evaluation sheets about achievements Students activities during the contact sessions Solving exercise problems, reading related chapters of the books Attending clicker lectures Asking help from the teachers when needed Collecting exercise points by themselves based on example solutions Discussing with a teacher to justify their points (teachers challenge students for their suggested points) for every submission of exercise answers 2

3 Deadlines Three threshold deadlines October 13 th : target topics 1-4 November 17 th : target topics 5-8 December 15 th : target topics 9-12 It is required for getting a credit, to complete at least four exercise problems within the target topics. For example, you are required to complete at least four exercise problems in topics 5-8 by the deadline of November 17 th Overall deadline of exercise problem completion December 15 th for topics You can get points out of exercise problems of any topics if you complete them until this deadline. IMPORTANT! The exercise points are valid ONLY AFTER you discuss with a teacher about your exercise answers in the contact sessions. Only submitting the answers through, e.g., MyCourses, and not having discussions with teachers do NOT entitle you to get points! 3

4 Books, Topics and Exercises Books Main books S. Saunders, Antennas and Propagation for Wireless Communication Systems, Chapters 3, 5, 6-8, 10, 12 15, Wiley. H. L. Bertoni, Radio propagation for modern wireless systems, Chapters 2-6, Prentice Hall. A.. Molisch, Wireless Communications, Chapters 1, 5 and 8, Wiley. John A. Richards, Radio wave propagation, an introduction or the non-specialist, Chapter 3, Springer. Hardcover or paperback copies of both books are available in AaltoELEC and main library. Supplemental books: D. M. Pozar, Microwave Engineering, Chapter 1, Wiley. Topic 1: prerequisite (Saunders Ch. 5 and Bertoni Ch. 4) Exercise 1: Free space pathloss Exercise 2: Link budget Topic 2: reflection and transmission (Ch. 3, Ch. 3) Exercise 1: Signal incidence and boundary conditions Exercise 2: Simulation of reflection and transmission 4

5 Schedule Wk Date Location New topics, lectures and deadlines Tue. 13 Sep. R037/TU Introduction; Topic 1: prerequisite Thu. 15 Sep. R037/TU Clicker lecture 1 Tue. 20 Sep. R037/TU Topic 2: reflection and transmission Thu. 22 Sep. R037/TU Clicker lecture 2 Tue. 27 Sep. R037/TU Topic 3: diffraction Thu. 29 Sep. R037/TU Clicker lecture 3 Tue. 04 Oct. R037/TU Topic 4: scattering and two-ray model; Thu. 06 Oct. R037/TU Clicker lecture 4 by Jan; Katsu away Tue. 11 Oct. R037/TU Topic 5: Terrestrial links; Katsu away Thu. 13 Oct. R037/TU Clicker lecture 5; threshold deadline of topics 1-4 Tue. 18 Oct. R037/TU Topic 6: Terrestrial and satellite links Thu. 20 Oct. R037/TU Clicker lecture 6 5

6 Friis Free-Space Transmission Formula Transmit antenna P t x G 1 z O φ R θ R Receive antenna A 2 P r Receive antenna aperture y S avg = P tg 1 4π R 2 G 2 = 4π A 2 λ 2 P r = S avg A 2 Power spectral density Output power from receive antenna 2 λ = P t G 1 G 2 4π R

7 Q1a: Assume an isotropic lossless radiator. The power spectral density at a field observa<on point depends on the radio frequency. A. True B. False

8 Friis Free-Space Transmission Formula Transmit antenna P t x G 1 z O φ R θ R Receive antenna A 2 P r Receive antenna aperture y S avg = P tg 1 4π R 2 G 2 = 4π A 2 λ 2 P r = S avg A 2 Power spectral density Output power from receive antenna 2 λ = P t G 1 G 2 4π R

9 Q1b: Assume an isotropic lossless radiator. The power spectral density at a field observa<on point depends on the radio frequency. A. True B. False

10 Q2a: Assume an isotropic lossless transmit radiator. The output power from an ideal receive antenna with a fixed physical aperture size does not depend on the radio frequency. A. True B. False

11 Friis Free-Space Transmission Formula Transmit antenna P t x G 1 z O φ R θ R Receive antenna A 2 P r Receive antenna aperture y S avg = P tg 1 4π R 2 G 2 = 4π A 2 λ 2 P r = S avg A 2 Power spectral density Output power from receive antenna 2 λ = P t G 1 G 2 4π R

12 Q2b: Assume an isotropic lossless transmit radiator. The output power from an ideal receive antenna with a fixed physical aperture size does not depend on the radio frequency. A. True B. False

13 Q3a: 200 mw corresponds to A. 100 dbm. B. 23 dbm. C. -7 dbw. D dbw. log 10 2 = 0.30, log 10 3 = 0.47

14 Q3b: 200 mw corresponds to A. 100 dbm. B. 23 dbm. C. -7 dbw. D dbw. log 10 2 = 0.30, log 10 3 = 0.47

15 Q4a: What is the link margin (db) of the following radio link? Transmitter 20 mw output Perfect matching A. 11 db B. 7 db C. 4 db Transmit antenna 5 dbi gain D. None of above Cable loss 3 db log 10 2 = 0.30, log 10 3 = 0.47 Free space loss 90 db Receive antenna 5 dbi gain Cable loss 3 db Matching loss 3 db Receiver 100dBm Noise level s Minimum required SNR 20 db

16 Q4b: What is the link margin (db) of the following radio link? Transmitter 20 mw output Perfect matching A. 11 db B. 7 db C. 4 db Transmit antenna 5 dbi gain D. None of above Cable loss 3 db log 10 2 = 0.30, log 10 3 = 0.47 Free space loss 90 db Receive antenna 5 dbi gain Cable loss 3 db Matching loss 3 db Receiver 100dBm Noise level s Minimum required SNR 20 db

17 Q5a: the noise temperature of the en<re receiver is A. T A + T R B. kg (T A + T R ) B C. G (T A + T R ) D. T A + GT R Receive antenna noise temperature T A k: Boltzmann constant Receiver Noise temperature T R Bandwidth B Gain G Noise figure F

18 Q5b: the noise temperature of the en<re receiver is A. T A + T R B. kg (T A + T R ) B C. G (T A + T R ) D. T A + GT R Receive antenna noise temperature T A k: Boltzmann constant Receiver Noise temperature T R Bandwidth B Gain G Noise figure F

19 Contact Sessions for Topic 1 earning outcomes of the present exercise problems are to Be aware of the assumptions behind the Friis free-space transmission formula (problem 1) Be able to analyze the link budget (problem 2) During the contact sessions, you are solving the exercise problems by referring to relevant parts of the course books. A limited number of course books are available in the room. encouraged to discuss with other students and teachers. asked to contact a teacher once your solutions are ready. If you prepare exercise solutions in an electronic format (recommended), upload the solution to MyCourses first and then contact a teacher. asked to propose points for your ready solutions to a teacher. not given exercise points without discussing with a teacher. The discussions MUST happen in the contact sessions. reminded that the threshold deadline of Topic 1-4 is October 13 th.

20 Schedule Wk Date Location New topics, lectures and deadlines Tue. 13 Sep. R037/TU Introduction; Topic 1: prerequisite Thu. 15 Sep. R037/TU Clicker lecture 1 Tue. 20 Sep. R037/TU Topic 2: reflection and transmission Thu. 22 Sep. R037/TU Clicker lecture 2 Tue. 27 Sep. R037/TU Topic 3: diffraction Thu. 29 Sep. R037/TU Clicker lecture 3 Tue. 04 Oct. R037/TU Topic 4: scattering and two-ray model; Thu. 06 Oct. R037/TU Clicker lecture 4 by Jan; Katsu away Tue. 11 Oct. R037/TU Topic 5: Terrestrial links; Katsu away Thu. 13 Oct. R037/TU Clicker lecture 5; threshold deadline of topics 1-4 Tue. 18 Oct. R037/TU Topic 6: Terrestrial and satellite links Thu. 20 Oct. R037/TU Clicker lecture 6 20

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