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In telecommunications, inter-symbol interference is a form of signal distortion that causes the previously transmitted symbol to affect the symbol currently received. This is in principle an unwanted effect because the effect of the preceding character acts as noise, which makes communication less reliable. There are solutions to reduce inter-symbol interference, for example the Viterbi algorithm, OFDM and OFDMA.
On a radio-mobile channel, inter-symbol interference resulting from multi-path propagation is not necessarily harmful. Indeed, it brings diversity in reception that can be exploited by different equalization mechanisms.
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