This paper studies the problem of sub-carrier grouping in the downlink of multi-carrier code division multiple access (MC-CDMA) systems with linear minimum mean square error (MMSE) receiver. Further, the problem is considered as combinatorial optimization problem. By theoretical analysis, an optimal sub-carrier grouping scheme is proposed. Moreover, the proposed scheme is efficient in computational time. According to the instantaneous channel conditions, the proposed optimal scheme can be applied adaptively sub-carrier grouping to maximize the system capacity. The simulation results show that the proposed scheme outperforms the conventional static schemes and is efficient in improving the system performance.
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