Method and a processing unit for processing a data signal
View Patent ↗The method includes receiving a data signal, the data signal including two training sequences, performing a first evaluation of the data signal based on a first training sequence of the two training sequences, performing a second evaluation of the data signal based on a second training sequence of the two training sequences, and processing the data signal based on a result of the first and second evaluations.
1. A method for processing a received data signal, the method comprising:
receiving a data signal by using a Voice services over Adaptive Multi-user channels on One Slot (VAMOS) receiver, the data signal comprising two training sequences;
performing a first evaluation of the data signal based on a first training sequence of the two training sequences;
performing a second evaluation of the data signal based on a second training sequence of the two training sequences; and
processing the data signal based on a result of the first and second evaluations;
wherein processing the data signal comprises burst synchronization.
2. The method according to claim 1 , further comprising:
performing a first evaluation comprising performing a first correlation between the data signal and the first training sequence and determining a first correlation maximum thereof;
performing a second evaluation comprising performing a second correlation between the data signal and the second training sequence and determining a second correlation maximum thereof; and
comparing the first correlation maximum with the second correlation maximum.
3. The method according to claim 1 , further comprising:
performing a first burst synchronization based on the first training sequence and performing a second burst synchronization based on the second training sequence; and
utilizing the result of one of the first and second burst synchronizations or an average thereof based on a result of the first and second evaluations.
4. The method according to claim 3 , further comprising:
utilizing the result of the first burst synchronization if the first correlation maximum is greater than the second correlation maximum, and
utilizing the result of the second burst synchronization if the second correlation maximum is greater than the first correlation maximum.
5. The method according to claim 1 , further comprising:
performing a first channel estimation based on the first training sequence and at the same time performing a second channel estimation based on the second training sequence; and
utilizing the result of one of the first and second channel estimations or an average thereof dependent on a result of the first and second evaluations.
6. The method according to claim 5 , further comprising:
utilizing the result of the first channel estimation if the first correlation maximum is greater than the second correlation maximum, and
utilizing the result of the second channel estimation if the second correlation maximum is greater than the first correlation maximum.
7. The method according to claim 6 , further comprising:
utilizing an average of the results of the first and second channel estimations if the first and second correlation maxima are equal or differ from each other by less than a pre-defined factor.
8. The method according to claim 1 , further comprising:
receiving as an information signal a rotational angle of the data signal.
9. The method according to claim 8 , further comprising:
de-rotating the received signal based on the rotational angle.
10. A method for processing a received data signal, the method comprising:
receiving a data signal, the data signal comprising two training sequences;
performing a first correlation between the data signal and a first training sequence of the two training sequences and determining a first correlation maximum thereof;
performing a second correlation between the data signal and a second training sequence of the two training sequences and determining a second correlation maximum thereof; and
processing the data signal based on a comparison between the first and second correlation maxima,
wherein processing the data signal comprises one or more of burst synchronization and channel estimation;
performing a first channel estimation based on the first training sequence and performing a second channel estimation based on the second training sequence; and
utilizing the result of the first channel estimation if the first correlation maximum is greater than the second correlation maximum;
utilizing the result of the second channel estimation if the second correlation maximum is greater than the first correlation maximum; and
utilizing an average of the results of the first and second channel estimations if the first and second correlation maxima are equal or differ from each other by less than a pre-defined factor.
11. The method according to claim 10 , further comprising:
performing a first burst synchronization based on the first training sequence and performing a second burst synchronization based on the second training sequence; and
utilizing the result of one of the first and second burst synchronizations or an average thereof based on a result of the first and second correlation maxima.
12. The method according to claim 11 , further comprising:
utilizing the result of the first burst synchronization if the first correlation maximum is greater than the second correlation maximum, and
utilizing the result of the second burst synchronization if the second correlation maximum is greater than the first correlation maximum.
13. The method according to claim 10 , wherein receiving the digital signal comprises receiving the data signal by using a Voice services over Adaptive Multi-user channels on One Slot, VAMOS, receiver.
14. The method according to claim 10 , further comprising:
receiving as an information signal a rotational angle of the data signal.
15. The method according to claim 14 , further comprising:
de-rotating the received signal based on the rotational angle.
16. A processing unit, the processing unit comprising:
a first correlator configured to perform a first correlation between a received data signal and a first training sequence and determine a first correlation maximum thereof;
a second correlator configured to perform a second correlation between the received data signal and a second training sequence and determine a second correlation maximum thereof;
a comparator configured to compare the first and second correlation maxima with each other and output a respective information signal in response thereto;
a first burst synchronization unit configured to perform a first burst synchronization based on the first training sequence;
a second burst synchronization unit configured to perform a second burst synchronization based on the second training sequence; and
a burst synchronization decision unit comprising a first input connected with an output of the first burst synchronization unit, a second input connected with an output of the second burst synchronization unit, and a third input connected with an output of the comparator.
17. The processing unit according to claim 16 , further comprising:
a first channel estimation unit configured to perform a first channel estimation based on the first training sequence; and
a second channel estimation unit configured to perform a second channel estimation based on the second training sequence.
18. The processing unit according to claim 17 , further comprising:
a channel estimation decision unit comprising a first input connected with an output of the first channel estimation unit, a second input connected with an output of the second channel estimation unit, and a third input connected with an output of the comparator.