Patent ID: 6229843
Filing Date: 2001-05-08
Classification: G06F,H03H,H04B,H04J,H04L,H04N,H04W,Y02D

Abstract:
A pilot vector correlator apparatus a) for receiving a spread signal, b) for collecting signal power from a spread pilot channel which is a component signal of the spread signal wherein the spread signal has a plurality of received multipath signal components to produce a combined despread signal, said spread pilot channel being spread by a predetermined pilot spreading code sequence, and c) for providing a plurality of multipath signal weighting values determined from the spread pilot channel; the apparatus comprising:local pilot code sequence generator means for generating a plurality of local code sequences, each of the code sequences being a code phase-shifted version of the pilot spreading code sequence;a plurality of pilot spreading code correlators, each pilot spreading code correlator correlating a respective one of the local code sequences with the spread signal, each spreading code correlator comprising a first multiplier which multiplies the spread signal by a respective one of the local code sequences to produce a correlated pilot signal value and accumulator means for accumulating the correlated signal for a predetermined period to produce a despread multipath pilot signal component with a carrier signal; wherein each one of the plurality of despread multipath pilot signal components is applied to a respective one of a plurality of low pass filters, to produce a respective one of the plurality of multipath signal weighting values, each multipath signal weighting value corresponding to a carrier signal phase value of the respective received multipath signal component; each one of the plurality of despread multipath pilot signal components and the respective multipath signal weighting value being applied to a respective one of a plurality of multipliers, wherein each multipath pilot signal component is multiplied by the respective weighting value to produce a respective phase rotated pilot signal component of a plurality of second phase rotated pilot signal components having substantially equal carrier phase values; andd) combining means for combining the plurality of phase rotated pilot signal components to produce the combined despread signal.