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Performance of a random OFDMA system for mobile communications

In this paper we consider the uplink performance of an OFDMA (orthogonal frequency division multiple access) system for mobile communications. We describe the random OFDMA system which is based on MC-FDMA (multicarrier FDMA), and where each user has a set of randomly selected subchannels. We also analyze the problem of block synchronization in an OFDM transmission. Then we describe three different system implementations depending on the underlying level of the block synchronization. We define the considered performance criteria and discuss the influence of the different system implementations. Finally, we show some simulation results for the performance of the different system implementations.