APPARATUS AND METHOD FOR MODIFYING AN M-SEQUENCE WITH ARBITRARY PHASE SHIFT

摘要

An embodiment of the invention described in the specification and drawings is an apparatus and method of generating a phase shifted maximum length pseudo-random sequence noise (PN) sequence without resorting to complicated counters and clocking schemes. The apparatus includes a linear feedback shift register (LFSR) (120) that has N stages and the ability to generate a first PN sequence at an output of its last stage. The LFSR is coupled to a first mask circuit (130a) and a second mask circuit (130b) for generating a second PN sequence and a third PN sequence. The apparatus further includes logic for selectively outputting bits form the second and third PN sequence to form a fourth PN sequence, which has a phase shift relative to the first PN sequence.