We propose a MC-CDMA (Multi-Carrier CDMA) system with MD (multi-detector). Due to unknown functional form of noise in wireless channel environments, it is not easy to design a detector through estimating the functional form of noise. Instead, we design a MD, which is based on DGT (Data Grouping Technique) and quantiles estimated through RMSA (Robbins-Monro Stochastic Approximation) algorithm. The system suggested here, MC-CDMA with MD, has the ability to alleviate problems associated with various noise components. To clarify the validity of our proposed system, the computer simulations have been performed under various channel environments.