Y. Liu and W. Mikhael (USA)
Blind Source Separation, Intercarrier Interference, OFDM
Orthogonal Frequency Division Multiplexing (OFDM) has wide applications in wireless communications. Due to frequency offset in a practical system, the orthogonality between the sub-carriers is not maintained. This leads to Intercarrier Interference (ICI) between the sub-carriers, which degrades the system's performance. In this contribution, a new ICI Cancellation method based on Blind Source Separation (ICIC/BSS) is proposed for OFDM systems employing differential modulation (OFDM/DM). In ICIC/BSS, the relative gradient algorithm is employed to estimate the transmitted signals in the sub-carriers. Also, techniques to solve the permutation and gain ambiguities are developed. Computer simulations are given, which confirm the effectiveness of ICIC/BSS. It is shown that the interference cancellation in ICIC/BSS is maintained for a wide range of interference conditions
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