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Orthogonal frequency division multiplexing (OFDM) system performance degrades due to symbol misalignment. We propose a symbol synchronization scheme based on channel estimation (CE). We applied linear interpolation in time domain and Winner filter in frequency domain to implement CE. The first path time delay of channel determines symbol timing offset. We perform inverse fast Fourier transform (IFFT)...
Low-density parity-check (LDPC) codes are widely applied in modern communication system for its capability of approaching channel capacity at low complexity. We design an efficient encoding scheme based on LU decomposition for China mobile multimedia broadcasting (CMMB). We search for element with lightest row-multiplying-column weight from the k th row and k th column, and exchange it with diagonal...
In this paper, we research the impulsive noise rejection in BPSK modulated OFDM symbol which is commonly used to transmit frame control information in physical layer frame. At this condition, the OFDM symbol in time domain is symmetry. We propose a new algorithm to mitigate the impulsive noise affect based on this symmetry. An impulsive noise model and an OFDM simulation platform are built for testing...
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