Resource allocation algorithm for multi-user MIMO-OFDM downlink with correlated channels

Abstract

To minimize transmitting power, an adaptive resource allocation algorithm is proposed for multi-user multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) downlink with correlated channels, which, based on the user’s grouping according to their spatial correlations, combines the shared manner and the exclusive manner to allocate sub-carriers. Between different groups the shared manner with a null steering method based on group marginal users is applied, whereas within a group the exclusive manner is applied. The simulations show that the power efficiency and spectral efficiency are improved; the base station transmitting antenna number and the computational complexity is decreased.

Keywords

MIMO-OFDM / multi-user / adaptive resource allocation / co-channel interference (CCI) / null steering