Abstract:

With the goal of minimizing the transmit power, an adaptive resource allocation algorithm is proposed for multiuser multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) downlink with correlated channels. Based on the users’ grouping according to their spatial correlations, the algorithm joints a shared manner and an exclusive manner. In different groups, the shared manner with a null steering method based on the group marginal users is applied. And in the same group, the exclusive manner is applied. The simulations show that the power and the spectral efficiency are improved; the base station antenna number and the computational complexity are decreased.

Key words: multiple input multiple output-orthogonal frequency division multiplexing, multiuser, adaptive resource allocation, cochannel interference, null steering