Cellular Radio
paging systems
- one way, ~ 30 bytes
- 1 Mb/s satellite can handle 240,000/minute
cellular phones (analog but going digital)
- advanced mobile phone system (AMPS)
- 10-20 km diameter cells, 0.6-3 watt xmitters
- 832 (30Khz) send channels in 824-849Mhz
- 832 (30Khz) receive channels in 869-894Mhz
- control, paging, signaling, data channels
- half each to an A carrier and to a B carrier
- 21 control and 45 data channels per cell
- phone scans control channels for strongest
- sends 32 bit serial # & 34 bit phone # /15 min
- mobile, base stations, mobile switching office