Method and circuit arrangement for calibration of a sampling control signal which influences the sampling time of a received signal from a sampling phase selection element

1. A method for calibration of a discrete sampling control signal that influences a sampling time of a received signal in a mobile radio receiver, from a sampling phase selection element by definition of quantization intervals for a sampling time error signal, wherein each quantization interval is allocated a predetermined value of the discrete sampling control signal, comprising in the mobile radio receiver:

a) shifting a received signal in the signal path upstream of the sampling phase selection element through a series of time shifts τ i ;

b) measuring values e i of the sampling time error signal that are associated with the respective time shifts τ i ; and

c) determining the quantization intervals of the sampling time error signal using the time shifts τ i and the measured values e i obtained in act b).

2. The method of claim 1 , wherein shifting the received signal through the series of time shifts τ i is performed in a signal path within the mobile radio receiver.

3. The method of claim 1 , further comprising determining an SINR value associated with the time shift is determined for each time shift τ i by means of an SINR measurement.

4. The method of claim 1 , wherein the sampling phase selection element is configured to perform an interpolation process on the received signal as a function of the discrete sampling control signal.

5. The method of claim 1 , wherein a signal source for the received signal is set to a fixed signal delay time in order to carry out the calibration process.

6. The method of claim 1 , wherein the calibration process is performed only once.

7. The method of claim 1 , wherein the calibration process is performed two or more times during a time period in which the mobile radio receiver is in use.

8. The method of claim 1 , wherein the time shifts of the series of time shifts τ i are predetermined time shifts.

9. A circuit arrangement for calibration of a discrete sampling control signal that influences a sampling time of a received signal in a mobile radio-receiver, from a sampling phase selection element by definition of quantization intervals for a sampling time error signal, wherein each quantization interval is allocated a predetermined value of the discrete sampling control signal, comprising in the mobile radio receiver:

a time shifting element in a signal path upstream of the sampling phase selection element, and configured to delay a received signal through a series of time shifts τ i ,

a time error measurement device configured to measure a sampling time error signal e i , for each of the time shifts τ i ; and

an evaluation device configured to calculate the quantization intervals of the sampling time error signal using the measured sampling time error signals e i and the series of time shifts τ i .

10. The circuit arrangement of claim 9 , wherein the sampling phase control element comprises an interpolator that keys the sampled received signal.

11. The circuit arrangement of claim 9 , wherein the time error measurement device comprises an early-late correlator.

12. The circuit arrangement of claim 9 , wherein the evaluation device comprises a digital signal processor.

13. The circuit arrangement of claim 10 , wherein the digital mobile radio receiver comprises a RAKE receiver.

14. The circuit arrangement of claim 13 , wherein the RAKE receiver comprises a plurality of fingers, and wherein each RAKE finger in the RAKE receiver comprises a sampling phase selection element.

15. The method of claim 1 , further comprising:

d) calibrating the discrete sampling control signal by allocating a predetermined value of the discrete sampling control signal to each quantization interval.

16. The circuit arrangement of claim 9 , wherein the time shifts of the series of time shifts τ i are predetermined time shifts.

17. A method for calibration of a discrete sampling control signal that influences a sampling time of a received signal in a mobile radio receiver, from a sampling phase selection element by definition of quantization intervals for a sampling time error signal, wherein each quantization interval is allocated a predetermined value of the discrete sampling control signal, comprising in the mobile radio receiver:

a) shifting a received signal in the signal path upstream of the sampling phase selection element through a series of time shifts τ i ;

b) measuring values e i , of the sampling time error signal that are associated with the respective time shifts τ i ; and

c) determining the quantization intervals of the sampling time error signal from the relationship between the time shifts τ i and the measured values e i obtained in act b), wherein determining the quantization intervals comprises:

c1) determining an optimum sampling time τ i — opt from the time shifts τ i ; and

c2) determining the quantization intervals relating to discrete time shifts that are associated with the optimum sampling time τ i — opt and to which the sampling phase selection element is set by evaluating measured values e i between each of the time shifts.

18. The method of claim 17 , wherein determining the optimum sampling time τ i — opt in c1) comprises:

determining a minimum value e i min of the measured values e i ; and

determining the optimum sampling time τ i — opt as a time shift τ i min associated with the minimum value e i min .

19. The method of claim 17 , wherein determining the optimum sampling time τ i — opt in c1) comprises:

detecting at different time shifts τ i a pilot signal contained in the received signal that is known at the receiver; and

determining the optimum sampling time τ i — opt as a time shift τ i max at which the pilot signal is detected with a maximum magnitude.

20. The method of claim 17 , wherein determining the quantization interval for the sampling time error signal in c2) comprises:

determining a mean value τ i mean k between two predetermined time shifts; and

determining a first interval boundary, which governs the quantization interval, as the measured value e i mean k that is associated with the mean value τ i mean k , with a second interval boundary of the respective quantization interval coinciding with a first interval boundary of the adjacent quantization interval.

21. The method of claim 17 , wherein the time shifts of the series of time shifts τ i are predetermined time shifts.

22. A mobile radio receiver including a circuit arrangement for calibration of a discrete sampling control signal that influences a sampling time of a received signal in a mobile radio receiver, from a sampling phase selection element by definition of quantization intervals for a sampling time error signal, wherein each quantization interval is allocated a predetermined value of the discrete sampling control signal, comprising in the mobile radio receiver:

a time shifting element configured to shift a received signal in the signal path upstream of the sampling phase selection element through a series of time shifts τ i ,

a time error measurement device configured to measure values e 1 of the sampling time error signal that are associated with the respective time shifts τ i ; and

an evaluation device configured to determine the quantization intervals of the sampling time error signal from the relationship between the time shifts τ i and the measured values e i , obtained in act b), wherein determining the quantization intervals comprises:

c1) determining an optimum sampling time τhd i — opt from the time shifts τ i ; and

c2) determining the quantization intervals relating to discrete time shifts that are associated with the optimum sampling time τ i — opt and to which the sampling phase selection element is set by evaluating measured values e i between each of the time shifts.