The various functional blocks necessary for the design and development of embedded wireless systems are illustrated and analyzed. Criticalities in the design process are also clarified and possible solutions for solving these problems are suggested
Material in the form of a lecture slide provided by the teacher
Learning Objectives
Analysis of wireless systems mainly oriented to embedded applications. Identification of the main design choices and critical aspects related to the development of wireless systems
Prerequisites
For a good understanding of the issues addressed within this course, it is useful for the student to be familiar with the basic principles of analog electronics, even at high frequency, radiopropagation and electromagnetic fields.
Type of Assessment
The final examination consists of an oral examination in which, through a deep discussion with the teacher, the level of confidence achieved in the lecture topics will be assessed.
Course program
Program
Wireless communication systems.
Impact of the channel in the design of a wireless communication system and effects of propagation and multipath in indoor and outdoor environments on the functionality of the system
The choice of the type of antenna to be used in a wireless system. Reference parameters: radiation pattern, directivity, antenna efficiency, antenna gain, sidelobes and antenna impedance
Transmitters and receivers: description of the different architectures including heterodyne, super heterodyne, image rejection mixer, zero IF and low IF, low IF transmitters, direct conversion transmitters indirect conversion transmitters Advantages, disadvantages, problems and fields of application.
Effects of non-linarites in transmission and receiver chains. The effects of compression, desensitization, blocking and intermodulation. The figures of merit for the characterization of non-linear phenomena: 1-dB Compression Point and IP3 and their propagation in the reception and transmission chains.
Effects of the choice of modulation in the development of a wireless system. The problems of analog modulations and digital modulations. Critical analysis with particular reference to ASK, FSK and PSK, QPSK, QAM
Sensitivity of a receiver its correlation with noise. Importance of noise in reception chains.
Coding techniques aimed at increasing the robustness of communication. The basics of CDMA, Direct Sequence Spread Spectrum and Frequency Hopping techniques
Description and critical analysis of some commercial transceivers: Chipset in the 433 - 868 Mhz band, Chipset in the 2.45 GHz band, Chipset in the 5.8 GHz band.
Solutions based on the System on a chip and Wide band transceiver approach with particular reference to Chipset-based solutions in the 300Mhz - 6 Ghz band and Chipset in the 800Mhz - 4 GHz band
Applications based on some standards for the development of embedded systems. 802.15.4 standard, LoRa standard
Millimeter wave solutions for the implementation of embedded systems and home automation
Internet of Thing solutions based on 5G technologies