Self-Successive Interference Canceller for Uplink OFDMA with Carrier Frequency Offsets

In OFDMA, the total available subcarriers are assigned to different users for simultaneous transmission. In case of an unsynchronized uplink OFDMA, each user has a different carrier frequency offset (CFO), which results in loss of orthogonality among subcarriers and causes severe intercarrier interference. In this paper, a self- successive interference canceller (self-SIC) algorithm is proposed for uplink OFDMA systems to mitigate both the self-intercarrier interference and multiuser interference resulting from carrier frequency offsets. We show that for a carrier allocation with larger blocksizes, the proposed compensation algorithm significantly reduces the implementation complexity without performance degradation.