JOINT SYNCHRONIZATION AND MODIFICATION OF THE COEFFICIENTS OF AN ADAPTIVE EQUALIZER FOR A CDMA RECEIVER

摘要

A method is disclosed for joint syncronization and modification of the coefficients of an adaptive linear equalizer (350) operating at chip-rate or higher in a CDMA system. A tacking module (340) estimates from the timing position and received energies of the Rake fingers the barycenter of the channel impulse response. This value is used to determine a delay offset at which the data is read out from the input buffer (310). If the delay offset has increased one chip (less delay) compared to the previous time slot, the equalizer coefficients of the adaptive equalizer are shifted to the right (more delay) compared to the previous time slot, the equalizer coefficients of the adaptive equalizer are shifted to the left (less delay). In this way the old coefficients of the previous slot can still be used for LMS adaption and the adaption accuracy is increased.