This paper proposes a low complexity partial parallel interference cancellation (LC-PPIC) scheme for an uplink multi-carrier direct sequence code division multiple access (MC-DS-CDMA) system.Specifically the proposed algorithm utilizes the results of channel estimation to classify users as reliable

invalid or ordinary in every subscriber.Reliable users are first subtracted after performing partial parallel interference cancellation (PPIC)

while

thereafter

the same process is executed among ordinary users

and invalid users are ignored.Finally

maximal ratio combining (MRC) is carried out for reliable and ordinary users to come up with the final detection results.It is worth noting that the algorithm takes advantage of channel estimation and frequency diversity

achieving improved performance with only a little increase in implementation complexity.Simulation results show that the proposed LC-PPIC detector outperforms both the after-MRC PPIC detector and the before-MRC detector

especially in a high system load and high signal to noise ratio (SNR) case.