Feasible resource allocation with partial channel information for grouped MC-CDMA systems

This paper puts forward two novel user-grouping algorithms for grouped MC-CDMA systems. The adaptive assignment for user-grouping plays an important role for link quality. We formulate the capacity-maximizing problem of user-grouping and analysis the optimal criterion for it. The derived optimal criterion has a similar form with signal to noise plus interference (SINR), with unassigned power included. Thus the unassigned power leads to an unpractical usage. We then investigate user´s equivalent SINR for minimum mean square error (MMSE) detection serving as assignment criterion, and propose two kinds of user-grouping algorithms. In these algorithms, only partial channel information is needed at the base station, which saves a large part of bandwidth occupying by feedback information. The proposed algorithms are evaluated by computer simulations to be prior to the conventional algorithm at both BER performance and data rate. Meanwhile, they have a lower implementation complexity for practical reality.