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Where an interferer transmits at a frequency that lies outside the nominal pass-band of the wanted signal, the level of interference experienced is a function of a) the interferer’s spectral leakage, as defined by its emission power spectral density, and b) the frequency response of the filtering {XE "Filtering"} at the receiver. These two effects can be characterised by the interferer’s adjacent-channel leakage ratio (ACLR) {XE "ACLR"} and the receiver’s adjacent channel selectivity (ACS) {XE "ACS"} respectively, as illustrated in Figure 455.
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The combination of these two parameters, in the form of
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