Subspace based detection in MC-CDMA over dispersive channel

A new blind MMSE detection for multi-carrier CDMA (MC-CDMA) over intersymbol interference (ISI) channels is proposed. The presence of virtual carriers is exploited to give a subspace based blind channel estimator followed by a linear MMSE equalizer. The proposed detector is attractive for its higher spectral efficiency, which is achieved by the elimination of cyclic prefix and training sequences. The complexity of the full dimension subspace detection can be reduced at the cost of some performance degradation. Representative results are provided to show the performance-complexity tradeoffs.