¥A baseband signal is any signal which transmits data in
the form of the amplitude of the signal voltage. The bandwidth of a baseband signal is
measured from zero frequency upwards to fmax .
¥A modulated signal transmits data by modifying the
amplitude, frequency, or phase of a carrier signal. The bandwidth of a modulated signal is
measured from the minimum frequency fmin (below the carrier frequency) upwards to fmax (above the carrier frequency).
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¥The full bandwidth of a signal is the frequency range that
includes all spectrum lines of the signal.
¥The absolute bandwidth (ABW) of a
signal is the width of the spectrum that contains 98% of the signalÕs total power.
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¥The effective
bandwidth (EBW) (bandwidth) of a signal is
the width of the spectrum that contains at least 50% of the signalÕs total
power. This is the part of the
signal whose power is within 3 dB of the complete signal.