Subspace Based Blind Channel Estimation for STBC-OFDM Systems

This paper proposes a subspace-based blind channel estimation method using virtual carriers for STBC-OFDM systems with two transmit and two receive antennas. The proposed method can be applied to STBC-OFDM systems with CP or no CP. No CP can achieve lower systems complexity, and potentially lead to higher channel utilization. A few CPs significantly improve the accuracy of the channel estimation. Simulations show that the proposed method obtains accurate channel estimation and fast convergence.