Robust MIMO-OFDM design for CMMB systems based on LMMSE channel estimation

Employing MIMO-OFDM architecture in the next generation of CMMB systems offers the potential to obtain higher spectral efficiency as well as diversity gain. In particular, a low-complexity effective strategy for transmission scheme based on parallel SFBC design is realized, while the data rate is the same as the traditional SFBC system. At the receiver, the time-frequency joint LMMSE wiener filtering channel estimation is proposed to accurately track the MIMO channel variation, whereby time-domain synchronizing signal is used for path delays estimation, while the MIMO path gains are acquired by the differential pilots without interference cancellation. Finally, the simulation results demonstrate the performance advantages of the proposed robust design.