Method and apparatus of pilot signal synchronization verifier

1. A method comprising:

verifying synchronization of a first and a second demodulated received symbols of a pilot signal pattern during a frequency acquisition by comparing a sliding sum of a real part of a sum of differential products of the first and second demodulated received symbols over one or more iterations of the frequency acquisition to an adaptive threshold which includes a metric of verification threshold values; and

repeating acquisitioning the frequency until the adaptive threshold is exceeded.

2. The method of claim 1 , further comprising:

adapting the adaptive threshold according to a sum of energies of the first and the second demodulated received symbols.

3. The method of claim 1 , further comprising:

transmitting the pilot signal pattern by a transmitting antenna; and

receiving the pilot signal pattern by a receiving antenna.

4. The method of claim 3 , further comprising:

transmitting two pilot signal patterns by two transmitting antennas; and

receiving the two pilot signal patterns by the receiving antenna.

5. The method of claim 1 , further comprising:

calculating the sum of differential product over pairs of consecutive demodulated received symbols, wherein the differential products of the transmitted pilot signal at a first time index and at a second consecutive time index of the demodulated received symbols comprise substantially equal values for the pilot signal pattern.

6. The method of claim 1 , wherein verifying synchronization further comprises:

comparing an absolute value of the sum of differential products of the first and the second demodulated received symbols to the adaptive threshold.

7. The method of claim 1 , wherein acquisitioning the frequency comprises:

estimating a frequency offset according to a sum of differential products of verified demodulated received symbols; and

adjusting a frequency according to the estimated frequency offset.

8. The method of claim 7 , wherein acquisitioning the frequency further comprises:

repeating acquisitioning the frequency until the frequency offset becomes smaller than a convergence threshold fox one or more repetitions.

9. The method of claim 8 , wherein acquisitioning the frequency further comprises:

aborting acquisitioning the frequency when an estimated frequency error becomes larger than a frequency divergence threshold for one or more repetitions.

10. A wireless communication system comprising:

a base station having two antennas wherein the base station is adapted to transmit two pilot signal patterns;

a mobile station adapted to verify synchronization of a first and a second demodulated received symbols of a pilot signal pattern during a frequency acquisition by comparing a sliding sum of a real part of differential products of the first and second demodulated received symbols over one or more iterations of the freguency acquisition to an adaptive threshold which includes a metric of verification threshold values; and

repeating acquisitioning the frequency until the adaptive threshold exceeded.

11. The wireless communication system of claim 10 , wherein the mobile station further comprises:

an energy accumulator to adjust the adaptive threshold according to the sum of energies of the demodulated received symbols.

12. The wireless communication system of claim 10 , wherein the mobile station further comprises:

a frequency acquisition module to provide a frequency correction signal according to an estimated frequency offset.

13. A wireless communication device comprising:

a verifier to verify synchronization to a pilot signal pattern by comparing a real part of a sum of differential products of a demodulated received symbols over two or more iterations of a frequency acquisition to an adaptive threshold which includes a metric of verification threshold values, and repeating the frequency acquisition until the adaptive threshold is exceeded; and

a flash memory device operably coupled to the verifier.

14. The wireless communication device of claim 13 , comprising:

an energy accumulator to adjust the adaptive threshold according to the sum of energies of the demodulated received symbols.

15. The wireless communication device of claim 14 , wherein the pilot signal pattern comprises two pilot signal patterns.

16. The wireless communication device of claim 13 , comprising:

a frequency acquisition module to provide a frequency correction signal according to an estimated frequency offset estimated according to a sum of differential products of a verified demodulated received symbol.

17. An apparatus comprising:

a frequency offset estimator to estimate an offset frequency according to a first differential metric at a transient mode and adapted to estimate the offset frequency according to a second differential metric at a steady state mode;

a frequency verification calculator to calculate a sliding sum of a real part of demodulated received symbols; and

a controller to provide a frequency correction signal according to the estimated frequency offset.

18. The apparatus of claim 17 , further comprising:

a first comparator to compare the estimated frequency offset to a convergence threshold; and wherein the controller is adapted to repeat a frequency acquisition until the frequency offset becomes smaller than the convergence threshold.

19. The apparatus of claim 18 , further comprising:

a second comparator to compare the sliding sum of real part of demodulated received symbols to frequency verification threshold ; and wherein the controller is adapted to repeat the frequency acquisition until the sliding sum exceeds the frequency verification threshold.

20. An article comprising a storage medium having stored thereon instructions, that, when executed by a computing platform, results in:

comparing a real part of the sum differential products of demodulated received symbols over two iterations of a frequency acquisition to a metric of verification threshold values; and

repeating the frequency acquisition until threshold is exceeded.

21. The article of claim 20 , wherein the instructions further result in:

repeating the frequency acquisition until the frequency offset becomes smaller than a convergence threshold.

22. The article of claim 21 , wherein the instructions further result in:

aborting the frequency acquisition when an estimated frequency error becomes larger than a frequency divergence threshold.

23. The article of claim 22 , wherein the instructions further result in:

estimating a frequency offset according to a sum of differential product of a verified demodulated received symbols; and

correcting a frequency according to an estimated frequency offset.