| |
| This paper considers the optimal resource allocation for MIMO-OFDM systems in multi-user downlink scenario. By using zero-forcing based SDMA scheme, the multi-user MIMO channels are converted to several SISO channels, which facilitate the proposed bit loading algorithm with the objective of minimizing the system bit error rate (BER). We provide the general mathematical formulation of the optimization problem which includes multi-user interference cancellation, multi-user diversity, bits and power allocation. We consider only the case that the total power and rate are defined by a system. Thus, our proposed algorithm can be expressed through a closed form equation, and it has very low complexity comparing with the iterative ones. |
|
| Keywords:MIMO; OFDM; multi-user; Zero-forcing; adaptive bit and power allocation |
|
