Performance Evaluation of QOSTBC and CR-QOSTBC over Correlated Channel

Space Time Block Code (STBC) schemes are widely used in MIMO systems for link performance improvement. For more than two transmit antenna systems, Quasi Orthogonal STBC (QOSTBC) and Constellation Rotation QOSTBC (CR-QOSTBC) is found to be appropriate. Various proposed STBC schemes are evaluated over Rayleigh fading channels, where there is no consideration for correlation between antennas. Inadequate distance between antennas creates correlated channels. Over this channel the performance of various schemes must be evaluated. This paper shows that the performance of various STBC systems is influenced by correlated channel. We analyze the performance of QOSTBC and CRQOSTBC systems over correlated wideband channels. The effect of correlation over CRQOSTBC and QOSTBC systems is presented by varying antenna spacing parameter in kronecker channel model. The comparison between CRQOSTBC and QOSTBC over correlated and uncorrelated channels is also discussed in this paper on the basis of simulations.