Gi-fi ( the next wireless technology)

what is baseband frequency used in gigabytes technology? or in Gi-fi?

on what factors we can say Gi-fi is quick deployed?

A typical baseband extends from DC (or close to DC) to several GHz if you want to transmit gigabits per second. This spectrum can be transmitted over a coaxial cable, by an optical fiber, or by a radio system. To transmit by radio, the spectrum bandwidth is reduced from 2x baseband width to a narrower one, by applying e.g. BPSK, QPSK or other "higher" vector modulation, also OFDM is used.

suppose I'm transmitting data in 5gaps in 7ghz spectrum . then what will be that maximum frequency that I can choose?

To transmit a 5gbps baseband , you will need ~ 3-3.5 GHz bandwidth to get no distortion. What do you mean by "7 GHz spectrum"?