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Chapter 4 Modulation and Demodulation > 4.5 Error Detection and Correction - Pg. 273

4.5 Error Detection and Correction 273 Input signal w 0 t w 1 t w 2 t w 3 t w 4 Summer Output signal Figure 4.12 A transversal filter, a commonly used structure for equalization. The output (equalized) signal is obtained by adding together suitably delayed versions of the input signal, with appropriate weights. a linear effect, and hence the effect of the channel on the pulse, due to dispersion, can be modeled by the response of a filter with transfer function H D (f ). Hence, in -1 principle, by using the inverse of this filter, say, H D (f ), as the equalization filter, this effect can be canceled completely at the receiver. This is what an equalization filter attempts to accomplish. The effect of an equalization filter is very similar to the effect of dispersion