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Chapter 2 RF Communications (Radio Data Transmission (Line Coding (RZ,…
Chapter 2
RF Communications
RF Spectrum
Range: 10k - 30 GHz
Regulation
Licensed vs. Unlicensed
Domestic (NBTC) vs. International (ITU)
Major 8 Bands: Ex. VHF, UHF
Radio Data
Transmission
Transmission System
Channel Types
Band-pass
Low-pass
Modulation
Analog ( A-to-A)
AM
FM
PM
Digital (D-to-A)
ASK
FSK
PSK
QAM
Line Coding
RZ
NRZ
Manchester
etc.
Transmission Speed
bps
baud rate
Bandwidth Utilization
Narrow-band
Transmission
Wide-band or Spread Spectrum
Transmission
FHSS
DHSS
Radio System
Components
Filter
Low-pass
High-pass
Bandpass
Mixer
Amplifier
Antenna
Radio System Design
Multiple Access
Random Access
CSMA/CA
Channel Partition
(Channelization)
TDMA
CDMA
FDMA
Transmission Direction
(Data Flow)
Half-duplex
Full-duplex
Simplex
Signal Strength
SNR
Multipath Distortion
Use directional antenna
Increase antenna height
Filter noise out
Amplifier
(both transmitter & receiver sides)
Use multiple receivers
Transmit multiple copies
(multiples frequencies)
Standard
Development
Standard Creation Committees
Forums
Government Regulatory Agencies
Types
De Facto
Official
Consortia