Semi-Blind CoMP System With Multiple-CFO Estimation and ICA Based Equalization

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The authors propose an Orthogonal Frequency Division Multiplexing (OFDM) based semi-blind Coordinated Multi-Point (CoMP) system, with a low complexity estimation approach for multiple Carrier Frequency Offsets (CFOs), and an equalization structure based on the Independent Component Analysis (ICA). Their work is different in that a small number of well-designed pilot symbols are employed to kill two birds with one stone. On the one hand, using the structure of pilots, a complex multidimensional search for multiple CFOs is divided into a series of low-complexity mono-dimensional searches. On the other hand, the cross-correlation between the transmitted and the received pilot symbols is explored to allow elimination of the remaining ambiguity in the ICA equalized signals.