With the development of software-defined radio digital communication systems, taking the field-programmable gate array (FPGA) as the control core has become a hotspot of the study on digital communication systems. In a high precision BDPSK communication system, the traditional way of acquiring a carrier based on the Costas loop can consume a large number of resources of FPGA devices. We introduce an improved Costas loop structure which can reduce the number of multipliers and adders and improve operation speed. In this 14-bit high precision intermediate frequency transmitting-receiving system, all basic units are integrated on a single FPGA chip, which can improve the integration degree of the system and its reliability. Meanwhile, all parameters and output data width of the system are programmable, which has good application prospects.

 

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