Quasi-Static Channel Estimation for Multiuser STBC-OFDM Systems

This paper proposes multiuser channel estimation techniques for Space Time Block Coded-Orthogonal Frequency Division Multiplexing (STBC-OFDM) systems based on simple blocked pilot grid. The estimation of multiuser channels is based on Least Square (LS) and Minimum Mean Square Estimation (MMSE) schemes. Simulation results, for a slowly faded quasi-static channel, reveal that the estimated characteristics closely agree with the actual channel characteristics. Comparison of LS and MMSE performance for various number of users is performed and different Doppler fading effects on MMSE performance are also presented.