Digital radio
From The Art and Popular Culture Encyclopedia
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Digital radio is the use of digital technology to transmit or receive across the radio spectrum. Digital transmission by radio waves includes digital broadcasting, and especially digital audio radio services.
Two-way digital radio standards
The key breakthrough or key feature in digital radio transmission systems is that they allow lower transmission power, they can provide robustness to noise and cross-talk and other forms of interference, and thus allow the same radio frequency to be reused at shorter distance. Consequently, the spectral efficiency (the number of phonecalls per MHz and base station, or the number of bit/s per Hz and transmitter, etc.) may be sufficiently increased. Digital radio transmission can also carry any kind of information whatsoever — just as long at it has been expressed digitally. Earlier radio communication systems had to be made expressly for a given form of communications: telephone, telegraph, or television, for example. All kinds of digital communications can be multiplexed or encrypted at will.
- Digital cellular telephony (2G systems and later generations):
- Digital Mobile Radio:
- Wireless networking:
- Military radio systems for Network-centric warfare
- Amateur packet radio:
- Digital modems for HF:
- Satellite radio:
- Wireless local loop:
- Broadband wireless access:
