自己设计的QDPSK调制解调程序。内容包括产生随机码元，绝对码转换为相对码，载波调制，解调，判决，相对码转换为绝对码。(QDPSK modulation and demodulation program designed by myself. The contents include generating random symbols, converting absolute codes into relative codes, carrier modulation, demodulation, and converting relative codes into absolute codes.)