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AD9361 FAST AGC

Thread Summary

The user is experiencing slow AGC convergence (250-300 samples) in a TDD burst system with an OFDM signal and a 128-sample guard interval. The recommended solution is to use the Fast Lock AGC algorithm and increase the ClkRF to 122.88 MHz to speed up AGC operation. The user is also facing signal disturbance and errors at -50 dBm signal power, likely due to AGC settings. Configuration parameters include gain update interval of 1000 us and various overload and threshold settings.
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Hi,

 

I am using fast AGC in a TDD burst system.

The convergence time of the AGC is too slow for my signal which is an OFDM signal with GI of 128 (convergence takes about 250-300 samples). How can I make it much faster?

 

Another problem is that if I increase the signal power up to about -50dBm then the RSSI (probably due to the AGC) jumps suddenly up to about -35dBm and the signal gets disturbed in such a way that errors start on the link. What can be the problem?

 

Thanks,

Y

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