A Design and Implementation Method of 256-Order Quadrature Amplitude Modulation

To implement multiple high modulation in satellite communication, a common design model of a high-order quadrature modulation scheme is presented, which can implement BPSK, QPSK, 16QAM, 64QAM, 256QAM and so on. Based on this model, the design and implementation of 256QAM are emphatically discussed. Some important technologies are solved, which include coding diagram of constellation mapping, generating of the orthogonal digital sine-cosine carriers, aligning the clock edges of the data, etc. Partial test results of 256QAM are given. It is proved that the implementation scheme of 256QAM is correct and practical.