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GPS give location but also you can obtain TIME.
A very precise time reference to be exact since
the satellites make use an atomic clock. All GPS
receivers provide an output for 1 PPS(one pulse
per second) signal. Usually is this signal which is
used for synchronizaton of the network.
Sorry I post quite off topic, but why high precision synchronization with GPS or Cesium is needed in SDH and also Wimax?
This synchronization is to avoid the necessity of clock recovery at reception - physical level, or something at higher levels? Why clock recovery isn't used (I guess for SDH by definition it's synchronous and clock recovery at Gb/s would be hard, but why not for Wimax)?
The time synchronization is needed because the base station are
transmitting the whole bandwidth in different time. So if they do
not know exactly the time alotted(TDD) they will colide, interfering each
other.
Clock recovery is a different situation. Or should we say phase syn
chronization?..Even if the BS does not have time reference by GPS still
needs to recover the phase for coherent detection.
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