Performance analysis of orthogonal space-time codes applicable to 4G LTE communications

This paper shows the comparison of average symbol error rate (SER) for different orthogonal space time codes. Here error rate is calculated in terms of SER from Moment Generating Function (MGF) for Maximal Ratio Combining (MRC) technique, Orthogonal Space Time Block Code (OSTBC), quasi-OSTBC (QOSTBC), the rotation of the constellation known as rotated QOSTBC and Space Time Trellis Code (STTC) with various space and time diversity methods. The simulation result shows that QOSTBC and rotated QOSTBC perform better than MRC and OSTBC systems. Finally, we have included the response of STTC in our simulations. Result represents that STTC outperforms in terms of coding gain, spectral efficiency, and diversity gain compared to other space time systems discussed in this paper. Moreover, the performance and complexity of STTC depend on the state of the encoder system.