Double DAGC (Digital Automatic Gain Control) factor compression and decompression device and method of LET (Long Term Evolution) CPRI (Common Public Radio Interface)

The invention provides a double DAGC (Digital Automatic Gain Control) factor compression and decompression device and method of an LET (Long Term Evolution) CPRI (Common Public Radio Interface); a compression terminal comprises a compression module and a CPRI transmitting terminal, wherein the compression module is used for compressing original I path data and Q path data and generating double DAGC factors; the compression module comprises an I path FIFO (First In First Out), a Q path FIFO, a maximum value search module, an effective Bit acquisition module and a quantitative interception module; the CPRI transmitting terminal is used for coding and framing the compressed I path data, Q path data and the double DAGC factors and transmitting the I path data, the Q path data and the double DAGC factors to a decompression terminal through an optical link; the decompression terminal comprises a CPRI receiving terminal and a decompression module; the CPRI receiving terminal is used to complete decoding and decoding frame and resolve the compressed I path data, Q path data and the double DAGC factors; the decompression module is used to restore the compressed I path data and Q path data according to the double DAGC factors.