Efficient Design of Polar Coded STTD Systems over Rician MIMO Channels

In this paper, a polar coded space-time transmit diversity (STTD) scheme is proposed in order to improve the performance of MIMO system. In Rician fading MIMO channels, the corresponding polar coded STTD system can be equivalent to a single transmission channel for each polar code bit. Density evolutions for the polar coded STTD systems are proposed based on the analyses of the single transmission channel. The proposed density evolutions provide preferable guidance to construct polar codes for the polar coded STTD systems. Simulation results show that the BER performance of polar coded STTD system is significantly improved as the number of antennas increases. The proposed 2 x 2 polar coded STTD system can provide better FER performance than LDPC-based system under low and mid code rates.