Patent ID: 7251269
Filing Date: 2007-07-31
Classification: H04B

Abstract:
1. An apparatus for tracking the optimum sampling time for a series of received, spread-coded data in a radio receiver, where the received data have been spread-coded at a transmitter end using a spreading sequence which is known at a receiver end, comprising: means for channel estimation which use a training sequence known at the receiver end to ascertain a channel impulse response for the transmission channel, means for convoluting the channel impulse response with the spreading sequence known at the receiver end, means for early/late correlation which correlate the training sequence data known at the receiver end at an early time and at a late time with the correlation sequence obtained by the convolution, and also, means for generating a tracking signal, which take the correlation ascertained at the early time and the correlation ascertained at the late time as a basis for generating a tracking signal for tracking an optimum sampling time.