Runlength limited codes and sequences for binary asymmetrical channels

Sequences And A New Code With Spectral Nulls at Rational Submultiples Of The Symbol Frequency

“…Thus the above Theorem is a special case where by just choosing the correct runlength constraints it is possible to obtain spectral nulls at rational submultiples of the symbol frequency. As an illustration of this Theorem the write spectrum for maxentropic (1,2,3,2), (1, 3, 5, 3) and (2, 5, 4, 5) sequences is given in Fig. 1.…”