User's Manual

ICS Repeater for Mobile WiMAX
Page
22 of 55
5.1.2. ICS Technology
Rx Antenna
Gain
Adaptive
Channel
Estimator
Selective
Channel
Emulator
Tx Antenna
A
t
Cancellation Quantity
30~40dB
Feedback
BTS
A
t
Feedback Signal
A
Input Signal
t
Input Signal
A
t
Received signal
Input Signal
A
t
Regenerated
Feedback Signal
A
t
Estimated
Feedback Channel
Transmitted Signal
Feedback
Channel Information
figure 5- 2 ICS Repeater operations
• ICS technology uses Digital Feedback Analysis that allows for
an 6 micro-second
cancellation time window and an unlimited number of interfering signals. ICS technology
allows for cancellation of reflections greater than 0.9km away.
5.1.3. Advantages of ICS
• Max. Repeater Gain = Antenna Isolation + 10dB, this is 40dB more than analog RF repeaters
• Interference Cancellation Range of 6 us – Repeater cancels feedback signals from up to
0.9km away.
• Parallel and Multiple digital signal processing – This provides super fast and accurate
interface cancellation, resulting in real time automatic gain adjustments during change of
feedback behavior in multi-path environments.