LMDS
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LMDS is a **DS family technology but it uses much higher frequencies - K-band, Ka-band (20 - 40 GHz).
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LMDS is a **DS family technology but it uses much higher frequencies - K-band, Ka-band (20 - 40 GHz). It offers much wider frequncy range, which means more TV channels. Also, due to relatively short wavelengths, the physical dimensions of the transmitting/receiving equipment are small. In addition 20 - 40 GHz frequency range usually is unloaded. But it has several disadvantages: expensive, because of the high cost of subscriber receiver; RF equipment is not so widespread and available as lower frequency one. But it useful or even irreplaceable in some situations.
| Parameter | LMDS (K-band, Ka-band) |
|---|---|
| Operation frequency range, GHz | 20.0 - 30.0 |
| Broadcasting standards | DVB-S/S2 or DVB-T |
| Modulation types | QPSK, 8PSK or COFDM |
| Coverage zone with one transmitter | up to 5km |
| Repeater Hops without regeneration | none |
| Repeater Hops with reregeration | unlimited |
| Cost of user's equipment | Expensive, because of the high cost of subscriber receiver |
| A possible way to receive | collective |
For typical solutions see: MVDS/MITRIS .