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中文摘要：
针对传统基于PSK调制的幅度相位双差分空时码（Amplitude—phase Double Differential Space—Time Codes）在信息传输速率提高时会带来性能严重下降以及每次只能传输奇数个比特的缺点，提出了一种适合于高阶PSK调制的改进的幅度相位双差分空时码方案。与传统幅度相位双差分空时码相比，通过引入多电平调制幅度系数的办法，提高信息传输速率，新方案对误比特性能和信息传输速率进行了一个较好的折中。而与基于PSK调制的单幅值差分空时码DSTC（Differential Space—Time Coding）相比，则是在相同的传输速率下提高了性能。
英文摘要：
The increase of bits rate would seriously decrease the performance of traditional amplitude-phase differential space-time codes and system can only transmit odd bits information. To ameliorate these disadvantages we proposed an improved amplitude-phase differential space-time codes scheme based on MPSK modulation. Compared with traditional amplitude-phase double differential space-time codes, this scheme well balanced error-bit rate and data rate to enhance the bits rate through introducing an amplitude coefficient of multi-level modulation. Under same bits rate comparing proposed scheme with DSTC （Differential Space- Time Codes）, the performance is enhanced.
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