如何在USRP上以非常高的采样频率降低带宽

I am using USRP with DBSRX daughter board. I need a very high sample frequency. Currently, the USRP can give me maximum sample frequency of 64M/8 in I and Q, and the data type is short, which takes 2 bytes.I am using USRP with DBSRX daughter board. I ne