METHOD AND APPARATUS FOR IMPROVING CHANNEL ESTIMATION IN PRESENCE OF SHORT SPREADING CODES

摘要

A method and apparatus for estimating a communication channel impulse response h(t) is disclosed. The method comprises the steps of generating com(t) = co(t + mNTcc) for m = 0,1,Lambda , M by correlating a received signal r(t) with a spreading sequence Si of length N (208), wherein the received signal r(t) comprises a chip sequence cj applied to a communication channel characterizable by an impulse response h(t)(204), and wherein the chip sequence ci is generated from a data sequence di spread by the spreading sequence Si (202); generating an estimated communication channel impulse response hM (t) as a combination of com(t) and dm for m = 0,1, Lambda ,M (210); and filtering the first estimated communication channel impulse response hM (t) to generate the estimated communication channel impulse response h(t) with a filter f selected at least in part according to the spreading sequence Si (212).