Abstract:   A simple system model of multiuser O FDM with adaptive resources allocation is given, which can get the optimal access algorithm in theory. But the optimal scheme isn 't realizable, so we present an realizable suboptimal algorithm that is based on the instantaneous characteristics of all the subchannels, it makes locally optimal choices at each step in the hope that these choices will produce a globally optimal solution or a close one. The results of simulation show that our proposed algorithm outperforms multiuser O FDM systems with static FDMA or CDMA techniques.

Key words: multiuser OFDM system, multiple access technology, adaptive resources allocate