An Iterative Interference Cancellation Approach for OFDMA Uplink System

In this paper, the issue of carrier frequency offset compensation in orthogonal frequency division multiple access (OFDMA) uplink system is investigated. To mitigate the effect of the multiple access interference (MAI) caused by the carrier frequency offset (CFO) of different users, a new iterative compensation algorithm is proposed. However, this scheme has unaffordable complexity. To tackle this problem, an efficient iterative implementation is developed in this paper based on a banded interference matrix approximation. Simulations illustrate that the proposed algorithm obtains good performance, at the same time has much lower computational complexity.