User's Manual

ICS Repeater for Mobile WiMAX
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1. Operating Description
The JI43-W2.5G-U/L is designed to amplify between multiple UEs and BTS in a WiMAX System.
The Unit consists of a filter and amplifier chain in the downlink and a filter and amplifier chains in
the uplink. The uplink and downlink paths are connected via a band pass filter on both ends of
each path.
1.1. Down Link
figure 1- 1 Downlink path
In the downlink path, a signal originating from the BTS is separated from the uplink signal in the
FEU(Front End Unit) switch by switching controller. It is forwarded to the ICU(interference
cancellation unit) by FEU switch. The ICU down-converts the signal to base-band, digital filters it
amplifies it and the up-converts it. In addition the interference cancellation system algorithm (ICS
algorithm) is implemented in the ICU.
Finally, the signal is sent to the final amplifier by FEU switch and is separated from the uplink
input signal in the FEU switch.