Patent ID: 7142585
Filing Date: 2006-11-28
Classification: H04B

Abstract:
1. Rake receiver for spread spectrum signals comprising a plurality of rake fingers each rake finger being adapted to receive a signal being part of a multipath signal and associated with a path of the multipath, said signal having a delay relative to an other signal associated with an other path of the multipath signal, a summation unit communicatively coupled to said plurality of rake fingers for generating a summation signal based on the signals received from at least some of the rake fingers, said summation signal having an improved signal to noise ratio (SNR) if compared with the signal to noise ratio (SNR) of at least one of the rake fingers, a timing error detector coupled to each rake finger for detecting an error of a delay (τ) of the signal of a rake finger and for generating a timing error signal which is sent to a unit for compensating the error of the respective delay (τ), and is based on the signals associated with paths of the multipath signal of more than one rake finger, wherein unit for compensating the error of the respective delay (τ) feeds signals to a detection path and to a synchronization path of each of the rake fingers, the synchronization path comprises a plurality of correlators in each of the rake fingers for a correlation of early and late signals received at each of the rake fingers, the signals being early or late with respect to signals on the detection path, wherein the timing error detector generates a timing error signal based on a weighted average value of the correlated signals.