Differential detection using rotated QPSK with transmit diversity

摘要

A differential space-time block code (DSTBC) proves to be attractive alternative to the coherent space-time block code (STBC) due to providing blind detection. This paper proposes a novel blind detection of orthogonal STBC (OSTBC) scheme using rotated QPSK constellation for four transmit antennas. The proposed encoder is represented by a super trellis diagram. At the receiver side, the Viterbi algorithm is applied without channel state information (CSI). Simulation results demonstrate the good performance of the proposed method.