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研究了超正交空时网格码和超准正交空时网格码的网格图特性,提出了一种基于合并网格传输路径的超正交空时网格编码方法.新方法研究了2×2正交空时分组码和4×4准正交空时分组码之间的结构关系,并利用2-TCM编码器构造出可用于4发射天线条件下的满速率、超正交空时网格码;并将2×2正交空时分组码矩阵结合星座图旋转的方法,使得新方法在获得高的编码增益同时,获得满分集增益.实验结果表明,在相同的条件下,新方法获得的编码增益比现有的基于4发射天线的超准正交空时分组编码方法提高2dB以上.
In this paper, we study the characteristics of grids of hypersurface space-time trellis codes and hyper-quasi-orthogonal space-time trellis codes, and propose a new method of hypersurface space-time trellis coding based on merging grid transmission paths. The structure relationship between 2 × 2 orthogonal space-time block codes and 4 × 4 quasi-orthogonal space-time block codes is constructed and the 2-TCM encoder is used to construct the full-rate, super-orthogonal Space-time trellis code, and the method of 2 × 2 orthogonal space-time block code matrix combined with constellation rotation makes the new method obtain high coding gain and achieve full diversity gain.The experimental results show that under the same conditions , The coding gain obtained by the new method is more than 2dB higher than that of the existing 4-transmit antenna based super-precision orthogonal space-time block coding method.