ECE 445S Real-Time Digital Signal Processing Laboratory - Lecture 15 - Announcements

Prof. Brian L. Evans

Announcements: Analog/RF Front Ends

Wireless transmitters and receivers consist of
- discrete-time digital baseband processing
- analog intermediate-frequency (IF) circuits
- RF circuits and antennas
Antenna diversity
- Part 1: Challenges -- how many antennas on a Boeing 787 airplane?
- Part 2: Planar Inverted-F Antenna
- Part 3: The Yagi Antenna
Design decisions about what processing to perform in RF, analog and digital.
- RF impairments due to the RF circuits, antennas and wireless propagation.
- Analog IF and digital baseband processing compensate RF impairments
- Communication performance vs. power consumption, area/volume, cost
"RF Chain" performs analog/RF processing on one RF signal
- Transmitter (lecture slide 1-27)
  - RF chain takes a discrete-time digital baseband signal and converts it to an RF transmission
  - data conversion, modulation, bandpass filtering, power amplification, and antenna
- Receiver (lecture slide 1-29)
  - RF chain converts RF signal to a digital discrete-time baseband signal
  - antenna, low-noise amplification, bandpass filtering, demodulation, and data converstion
- QAM has in-phase (I) and quadrature (Q) components
  - Two data converters -- one for the I component and the other for the Q component
  - QAM modulation/demodulation has I-Q paths

Last updated 04/19/23. Send comments to (Mailbox) bevans@ece.utexas.edu