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The problem of blind channel estimation for multiple single-antenna Orthogonal Frequency Division Multiplexing (OFDM) systems coexisting in the same band is considered. Based on the previous work on linear precoding for blind channel estimation for OFDM systems, a new precoder design based on zero-hole matrices is proposed and optimal design is derived. Numerical results show the validity of their design. The proposed method can be used to design precoders to separate and estimate the channels from multiple basestations to a terminal station in cell edge even in case of colliding pilot tones in full frequency reuse.
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