Take the mobile LTE mobile phone as an example: LTE RAM dump refers to storing the FM decoded baseband signal data of mobile network information in RAM memory, so as to reduce the pressure on the cache space inside the CPU and release more internal CPU resources for other applications of the mobile phone! For details, please refer to the excerpt of the paper "Research and Implementation of Data Transmission Technology in TD-LTE System": The test platform of TD-LTE wireless terminal is based on FPGA DSP ARM, and the downlink baseband OFDM signal of TD-LTE system is generated and processed in FPGA. Considering that FPGA has to deal with other algorithms and logic control, and its internal storage capacity is limited, after the large-capacity baseband OFDM signal is generated, it needs to be stored in DDR2 SDRAM and then sent by radio frequency.