Performance evaluation of a QOMOE multiuser detectorfor turbo coded CDMA systems in frequency-selective fading environment

The paper analyzes the performance of the quasi-orthogonal minimum output energy (QOMOE) multiuser detector (MuD) for a turbo coded CDMA systems in additive white Gaussian noise (AWGN) with frequency selective fading environment. The QOMOE multiuser detector minimizes the output variance with respect to the component equivalent to the quasi-orthogonal component to the desired user´s signature waveform, then the solution is the linear minimum mean square error (LMMSE) transformation. The QOMOE receiver employs maximal-ratio combiner (MRC) for detecting the desired user. A comparison is made among QOMOE-MRC, matched filter (MF-MRC), decorrelator-MRC, LMMSE-MRC and blind adaptive-MRC receivers, in a frequency selective fading channel. Analysis and simulation results show that the QOMOE-MRC can obtain better performance than that of other considered receivers