一种新型半定松弛的多符号相移键控（MPSK）差分检测算法

he maximum-likelihood multiple-symbol differential detector (ML-MSDD) allows for power-efficient transmission without requiring channel state information at the receiver. The complexity of ML-MSDD quickly becomes intractable as the observation window size grows. A new semi-definite relaxation quasi-maximum-likelihood multiple-symbol differential detection (SDR-QML-MSDD) has been proposed, which can gain a better performance with considering reduced complexity. Now, this approach is used in system only based on differential QPSK modulation. In this paper, we solve the problem used differential MPSK modulation with SDR-QML-MSDD method.