CDMA Frequency Band and calculation

CDMA technology is available is 450 Mhz, 800 Mhz and 1900 Mhz band. Out of these we are using 800 Mhz in current system.

The band is having two electromagnetic channels. One for Base Station to Mobile Station communication (called the FORWARD LINK or the DOWN LINK) and another for Mobile Station to Base Station communication (called the REVERSE LINK or the UP LINK).

In 800 MHz Cellular these two duplex 1.25 MHz bands are 45 MHz apart

In 1900 MHz PCS these two duplex 5 MHz bands are 80 MHz apart

In 450MHz, they are 10MHz apart

CDMA Frequency calculation

450MHz

BS receiver(Uplink): 450.00+0.025(N-1)

BS sender(downlink): 460.00+0.025(N-1)

800MHz

BS receiver(Uplink): 825.00+0.03N

BS sender(downlink):870.00+0.03N

1900MHz

BS receiver(Uplink): 1850.00+0.05N

BS sender(downlink):1930.00+0.05N