My Summary in Advanced Telecommunication Engineering Course

Fajar Purnama
7 min readJan 13, 2021

My Impression on This Class

My undergraduate is in electrical engineering in the field of telecommunications but I knew only a little of telecommunications and excels at programming and computer network. Back then I was unfortunate in taking a short electromagnetic wave course that the course was until before maxwell equation which is why I did not know about maxwell equation. In the end I’m very weak on that field and finds it hard to study antennas. Thanks to this masters course I was able to learn more of my field and cover some of my weaknesses. If I could give suggestion of this course, I would suggest the use of computer simulations such as Octave to demonstrate electromagnetic waves and polarization, Splat for RF propagation, or nec2c for antenna design simulation which will make the course more interesting. These are opensource softwares. This assignment except the images has never been published anywhere and I, as the author and copyright holder, license this assignment customized CC-BY-SA where anyone can share, copy, republish, and sell on condition to state my name as the author and notify that the original and open version available here.

What is the difference between the LOS and NLOS environment?

  • LOS stands for line of sight where in propagation the transmitter and receiver can physically see each other, while NLOS stands for non line of sight, the opposite of LOS where the transmitter and receiver cannot physically see each other.
  • In a LOS environment we mainly examine the link budget. The link budget in general consist of three factors which are (1) the power generated at the transmitter, (2) free space loss, (3) the power can be receive on the receiver. On the transmitter and receiver side there is the electrical power generated, cable loss of the transmission line, and the gain of the antenna which is mainly affected by the directivity. The 2 main factors that affects the free space loss are the frequency of the signal and the distance between the transmitter and the receiver.
  • However there are more factors to be considered in a NLOS environment, eventhough it also exist on LOS environment but not as strong. On Figure 1 shows a comparison illustration between LOS and NLOS where basically daisy chain, penetration, reflection, and diffraction usually occurs on NLOS. On the penetration side not all the radio waves…
Fajar Purnama

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