Patent ID: 8379694

Claim:
A receiver, for use in a wireless transmit/receive unit (WTRU), configured to receive a spread spectrum signal over a wireless multipath fading channel, the receiver comprising: a code tracking loop (CTL), the CTL comprising: an input sample selector configured to select an on-time, late, and early sample from a plurality of received samples; a late sample pseudo noise (PN) despreader coupled to the input sample selector configured to despread the selected late sample based on a PN sequence known to the receiver; an early sample PN despreader coupled to the input sample selector configured to despread the selected early sample based on the PN sequence known to the receiver; an early and late detector comprising a late power calculator, an early power calculator, and a first summer coupled to the early sample PN despreader and the late sample PN despreader, the early and late detector configured to calculate an error signal based on a despread early sample and a despread late sample; an integrator and dump circuit coupled to the early and late detector, the integrator and dump circuit configured to accumulate N error signals, where N is an integer greater than 1 that indicates a number of error signals calculated in an integration interval; a sign calculator coupled to the integrator and dump circuit configured to calculate the sign but not the magnitude of the accumulated error signals and output the calculated sign as a control signal; and a second summer coupled to the sign calculator and the input sample selector, the second summer configured to: receive the control signal from the sign calculator as a relative timing adjustment and a previous output from the second summer; sum the previous output and the relative timing adjustment to calculate an absolute timing adjustment; and output the absolute timing adjustment to the input sample selector.