Dynamic frequency selection in OFDMA

In an OFDM system, dynamic frequency selection is an approach to efficiently improve the spectrum usage. According to the channel magnitude response, each user selects the subcarriers with the highest channel gain. The existing algorithm divides the whole subcarriers into partitions, and each user selects one for simplicity. To get better performance, a larger number of partitions with less subcarriers is needed. The existing algorithm is modified by increasing the successful allocation probability to allocate more partitions to each user. And to guarantee cooperation among users, the higher priority to allocate is given to the user which has the largest amount of deep fading partitions