engleski

Signal processing algorithm for OFDM channel with impulse noise

Orthogonal frequency division multiplexing (OFDM) has received a considerable attention for realisation of high-speed communication systems. Digital data is transmitted on N subchannels simultaneously, and the frequency responses of the subchannels are overlapping and orthogonal. To avoid interference between adjacent channels, the guard interval in frequency domain is used. Impulse noise is bursty, high amplitude, low probability noise, taking the form of the time domain impulse. Such impulses of very short duration contain spectral components on all subchannels, and thus impact the decision of symbols transmitted on all subcarriers. The receiver detects the presence and the position of the impulse within the OFDM symbol by combining the power calculation in time and frequency domain. Samples corrupted by impulse noise are reconstructed by using redundancy of the guard band in the frequency domain. Simulation results for moderate Signal-to-Noise-Ratios are reported.

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