Adaptive resource allocation for OFDMA systems under peak power constraint

The conventional adaptive resource allocation schemes for Orthogonal Frequency Division Multiple Access (OFDMA) systems cannot guarantee that the peak power of its time-domain modulated signal shall not exceed the transmitter peak power limit. When such a limit is exceeded, the transmitter creates extra in-band and adjacent-band interferences that were not considered by the conventional resource allocation algorithms, and thus invalidate the optimality of resource allocation. We therefore propose a novel optimization strategy in resource allocation under the peak power constraint. An adaptive iterative resource allocation scheme is developed that maximizes the system throughput and does not create any extra in-band and adjacent-band interferences. In addition a joint scheme of resource allocation and peak power reduction is developed for further throughput improvement.