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What is relation between roll off factor bandwidth and bit rate?
Wiki User
∙ 11y ago
The roll-off factor of a digital filter defines how much more bandwidth the filter occupies than that of an ideal "brick-wall" filter, whose bandwidth is the theoretical minimum Nyquist bandwidth.
The Nyquist bandwidth is simply the symbol rate expressed in Hz:
Nyquist Bandwidth (Hz) = Symbol Rate (Sym/s)
However, a real-world filter will require more bandwidth, and the excess over the Nyquist bandwidth is expressed by the roll-off factor. Suppose a filter has a Nyquist bandwidth of 100 MHz but actually occupies 120 MHz; in this case its roll-off factor is 0.2, i.e. the excess bandwidth is 0.2 times the Nyquist bandwidth and the total filter pass-bandwidth is 1.2 times the Nyquist bandwidth.
Wiki User
∙ 11y ago
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