In the Ietter the correlation properties of extended m-sequences are t
reated and compared to those of m-sequences. Extended m-sequences are
obtained from m-sequences inserting an additional element per period y
ielding periods 2n, where n is an integer. It turns out that extended
m-sequences provide good autocorrelation but poor crosscorrelation pro
perties. This behaviour is similar to that of m-sequences.