Outline
RF/Wireless Key Observations and Tradeoffs
Introduction
• Radios everywhere • radio evolution
Spectrum and Power
• Radio power management • Spectrum is precious • Spectrum vs. power efficiency
Frequency vs. Range
• Antenna size vs. frequency
Decibels: You Can Speak dB
Decibels
• motivations for using decibels • exponential scale • arithmetic in the dB system
Approximating dB Conversions
• convert to dB in your head • convert from dB in your head
Special Problems at RF Frequencies
Power Transfer and Reflections
• transmission lines • cables and connectors • mismatches
Radio Waves
• frequency • wavelength • phase
Modulation
• AM, FM • Digital Modulation • ASK, PSK, QAM • fundamental tradeoffs
Radio Wave Propagation
• energy spread • reflections/multipath • fading • doppler
Multiple Access Techniques
Cellular Concept
• frequency re-use with a cellular system
Spectrum Sharing
• FDMA • TDMA • CDMA • OFDMA • MIMO