An limited feedback based QOSTC scheme in Rayleigh fading channel

The QOSTBC(Quasi-Orthogonal Space Time Block Code) using feedback channel to improve the system performance. Due to the increased amount of feedback, the space-time code has higher complexity and loses their own advantages. Aiming at the above problem, this paper proposed an improved limited feedback quasi orthogonal space-time code scheme, based on the diagonalized reconstruction of encoding matrix and rotation of equivalent sub-channels. Therefore, this method reduces the system complexity and increases the equivalent channel gain and also improves the performance of the system. The simulation results demonstrate the effectiveness of the proposed scheme.