Method of operating a message receiver

1. A method of operating a message receiver for a message that is present as a burst allocated to a time slot which includes at least a training sequence and useful data, said training sequence including at least a first partial sequence and a second partial sequence, and said first partial sequence comprising periodic data, said method comprising stepwise synchronizing said receiver to said burst as said burst is received by performing the steps of:

in a first synchronizing stage, using said first partial sequence to determine a clock frequency of said message and at least one of a phase position of a carrier frequency of said burst and the carrier frequency of said burst, and

in a second synchronizing stage, using said second partial sequence to synchronize said receiver to said time slot of said burst, said second synchronizing stage occurring after said first synchronizing stage.

2. The method according to claim 1 , and calculating a channel impulse response and a gain control factor (AGC) during the second synchronizing stage.

3. The method according to claim 1 , wherein the receiver is synchronized during the second synchronizing stage with the carrier frequency of the burst.

4. The method according to claim 1 , wherein the receiver is synchronized during the second synchronizing stage with a phase position of the carrier frequency.

5. The method according to claim 1 , wherein the receiver is synchronized with a phase and a frequency of a carrier frequency tracking after the first synchronizing stage or during or after the second synchronizing stage.

6. The method according to claim 5 , wherein the tracking takes place when the message is decoded.

7. The method according to claim 5 , wherein the tracking and decoding take place by means of a Viterbi decoder and according to Viterbi & Viterbi algorithms.

8. The method according to claim 1 , wherein at least one of the two partial sequences includes a symbol sequence, which enables alignment of the time slot of the burst and calculation of channel impulse response, the phase position, gain control factor (AGC) as well as transmission power.

9. The method according to claim 1 , wherein one of the two partial sequences includes pilot signals.

10. The method according to claim 1 , wherein at least one of the two partial sequences includes at least pseudo noise sequences.

11. The method according to claim 1 , wherein the useful data of the message is statistically evaluated for the second synchronizing stage.

12. The method according to claim 1 , wherein the training sequence comprises a constant duration or number of symbols.

13. The method according to claim 1 , and detecting an incoming burst in the receiver by means of power detection.

14. The method according to claim 1 , wherein the time slot has a structure which is determined when the burst arrives.

15. The method according to claim 1 , and calculating a channel impulse response by cross correlation of the burst and the second partial sequence.

16. The method according to claim 15 , wherein, during the cross correlation, the training sequence is shifted by a pre-definable number of symbols, in order to determine a corresponding number of multipath propagation echoes.

17. The method according to claim 16 , wherein the phase position and amplitude of each multipath propagation is determined from the echoes.

18. The method according to claim 17 , and determining the gain control factor from the phase position and the amplitude.

19. The method according to claim 17 , and determining a constant phase position for each of the multipath propagation.

20. The method according to claim 1 , and evaluating a periodic partial sequence in time domain.

21. The method according to claim 20 , and evaluating the second partial sequence within a complex number range.

22. The method according to claim 1 , and adding the training sequence as a preamble to the useful data.