Block Faded Channel Estimation for Multiuser STBC-OFDM Systems

Accurate channel estimation is necessary to gain the advantage of space time coding for decoding purposes. Most of the previous work on Orthogonal Frequency Division Multiplexed (OFDM) channel estimation focused on single user systems. Hence, they are inappropriate in the multiuser communication systems. In this paper, we proposed a novel multiuser channel estimation technique based on simple blocked pilot grid for Space Time Block Coded (STBC)-OFDM systems. We simulated the proposed scheme for slowly faded quasi-static channel. LS and MMSE estimator performance for different number of users are also analyzed.