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In this paper, the authors propose a channel estimation algorithm based on incremental pilots. These are pilots additionally inserted after puncturing the modulated Orthogonal Frequency Division Multiplexing (OFDM) symbols to enhance channel estimation performance without lowering bandwidth efficiency. A low-density parity-check code puncturing scheme is also proposed to prevent the performance degradation due to the codeword bit loss caused by punctured OFDM symbols. For the channel estimation in coherent Orthogonal Frequency Division Multiplexing (OFDM) system, conventional pilot-aided schemes are widely used in practice because they decouple symbol detection from channel estimation.
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