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Adaptive code-tracking receiver for direct-sequence code-division multiple access (CDMA) communications over multipath fading channels and method for signal processing in a rake receiver
Adaptive code-tracking receiver for direct-sequence code-division multiple access (CDMA) communications over multipath fading channels and method for signal processing in a rake receiver
The invention is directed to a method for signal processing in a rake receiver for spread spectrum signals and is directed to a rake receiver for spread spectrum signals including a plurality of rake fingers (9, 10, 11) each rake finger being adapted to receive a signal (7, 8) being part of a multipath signal (2) and associated with a path of the multipath, the signal (7, 8) having a delay (τ) relative to an other signal associated with an other path of the multipath (7, 8), the receiver comprises a summation unit (37) for generating an output signal from the signals received from of at least some of the rake fingers (9, 10, 11), the output signal being a summation signal having and improved signal to noise ratio (SNR) if compared with the signal to noise ratio (SNR) of at least, one of the rake fingers (9, 10, 11), a timing error detector (12) for detecting a delay (τ) between signals of at least two rake fingers (9, 10, 11) and for generating a timing error signal which is sent to a unit (6) for compensating the error of the respective delay (τ); to provide a code-tracking unit for a direct-sequence code division multiple access (DS-CDMA) receiver having an improved tracking performance, especially in cases where delay times of multipath signals are in the order of the chip duration the timing error detector (12) generates a timing error signal (x, 13) based on the signals (7, 8) associated with paths of the multipath of more than one rake finger (9, 10, 11).
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