中文摘要：

为了能在满足空时分组码完全分集的同时尽可能降低译码复杂度，提出了准正交空时分组码的自适应设计方案．在准正交空时分组码的编码结构上添加自适应系数，根据当前信道状态信息计算自适应系数的具体数值．设计的目的是保证传输的数据符号之间相互正交，彼此没有干扰，从而实现完全分集，并能采用复杂度低的单符号译码方法．仿真结果表明，准正交空时分组码自适应方案的误码率性能要明显好于采用星座旋转的准正交空时分组码方案，只需要采用有限反馈的方法就能实现近似理想反馈的误码率性能．

英文摘要：

To achieve full diversity and decrease decoding complexity, an adaptive design for quasi-orthogonal space-time block codes is proposed. Known of channel state information, the adaptive parameter can be calculated, and the input symbols can be coded in the designed structure. With the particular space-time codes structure, symbols on different antenna are orthogonal to each other, and the received symbols can be single-symbol decoded. Simulation shows that the adaptive scheme has obvious advantage compared with constellation rotation scheme. The limited feedback scheme is feasible and has almost the same optimal performance as the ideal full feedback scheme.