the block(interfering signal） is larger than the desired signal up to 30dB,eg，block：-20dBm，desired signal：-50dBm。how can i set the gain? i want to get the P-1 before the LPF.but i can't find the exact index from the datasheet.how can i estimate
As this being a integrated transceiver there is no spec defined for each block.
You can use AGC with a required threshold to make sure signal chain is not saturated, from your requirement it looks like the difference b/w interfere and signal is 30dB which is well covered by dynamic range of signal chain.
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