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In Spectrally Efficient Frequency Division Multiplexing systems the inputdata stream is divided into several adjacent subchannels where the distance ofthe subchannels is less than that of Orthogonal Frequency DivisionMultiplexing(OFDM)systems. Since the subcarriers are not orthogonal in SEFDMsystems, they lead to interference at the receiver side. In this paper, aniterative method is proposed for interference compensation for SEFDM systems.In this method a soft mapping technique is used after each iteration block toimprove its performance. The performance of the proposed method is comparableto that of Sphere Detection(SD)which is a nearly optimal detection method.

Iterative Detection with Soft Decision in Spectrally Efficient FDM Systems