A comparison of uplink channel estimation techniques for MC/JD-CDMA transmission systems

The problem of MIMO (multiple input multiple output) uplink channel estimation in MC/JD-CDMA (multi-carrier joint detection code division multiple access) systems is dealt with. Two different estimation approaches are proposed. The first approach is capable of directly estimating the desired samples of the so-called combined impulse response while the second approach relies on the well-known concept of estimating the samples on an unknown channel impulse response. In the course of the paper, the two approaches are discussed indicating both their advantages and drawbacks. Finally, simulation results are presented to facilitate a comparison of two approaches using a realistic channel model.