Part Number: TCI6630K2L
We are using the K2L EVM with AFE7500 (IQNet interface).
We are presently exploring the IQNet configurations for aligning the received IQNet frame with the Over-The-Air LTE DL Frame.
To explain the scenario in more detail:
- IQNet PktDMA will be initially configured to receive un-aligned LTE DL samples
- LTE DL Synchronization is done in SW which will give us the Frame offset for LTE DL frame. Let's call that as DL_FRAME_OFFSET.
- We want to configure this DL_FRAME_OFFSET in the IQNet so that we can receive aligned LTE DL OFDM Symbols/Slots/Sub-frames through the PktDMA interface.
- We also plan to configure the IQNet interface to compensate for the DL Sample Drifts which can arise due to mismatch in eNB/UE clocks, so as to ensure Frame alignment.
We have done some experiments with limited success.
Experiments done:
- Successfully programmed the BCN Offset which resulted in an equivalent jump in the BCN Frame Event. But this did not have any effect on the RADT Symbol/Slot events through which IQ samples were reveived/transmitted with PktDMA.
- Manipulated the BCN Comparator for a specific RADT instance, but we didn't observe any change in the timing of the Symbol/Slot events.
To summarize, we need a way to configure the alignment of the received radio frames in LTE using the IQNET interface.
