The natural binary code, Gray code and the relations between them are introduced. The differential encoding methods of the natural binary code and Gray code in 4DPSK system are discussed, and two examples are given.
彭燕妮.四相差分相移键控的编码[J].重庆工商大学学报(自然科学版),1999,(2): Peng Yanni. The Encoding Rules in 4 Differential Phase-shift Keying System[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),1999,(2):