Drift elimination in system identification using binary m sequences

It is shown that, by crosscorrelating over two periods only of the output when using msequences to identify linear time-invariant systems, the elimination of the effect of drift up to the (N ¿ 2)th power in the power-series representation of the distrubrance is possible, where N¿ is the period of the sequence. The method is more complex than that proposed by Brown.