Adaptive tone-reservation PAPR technique with optimal subcarriers allocation awareness for multi-user OFDMA systems

In this paper, an adaptive tone reservation technique with optimal subcarrier allocation awareness for multi-user OFDMA systems is investigated. In general, a variety of approaches have been proposed to cope with the PAPR problem in OFDM systems. A tone reservation (TR) is an effective technique for reducing PAPR, in which it does not need to transmit any side information and there is no distortion on the data-transmitting carriers. However, there is no rule to reserve the tone in the TR technique. In this paper, we propose to use a non-selected tone resulted from the optimal subcarrier allocation algorithm, based on the subcarrier´s channel gain approach, as a reserved tone. This proposed technique could enhance the throughput while reducing PAPR of the OFDMA systems. Simulation results show that the proposed TR method with optimal subcarrier allocation in OFDMA systems achieves better PAPR reduction and throughput performance than the conventional TR without subcarrier allocation systems.