Method and device for OFDM channel estimation

1. A method for orthogonal frequency division multiplexing (OFDM) transmission, the method comprising the stages of: providing a channel estimation sequence that is characterized by a low peak to average ratio over a significant range of guard to information power ratio, wherein the significant range exceeds 5 db; and transmitting by a transmitting circuitry of an OFDM device the channel estimation sequence over multiple sub-carriers, whereas the stage of providing involves utilizing a certain frequency domain sequence that comprises at least the following elements: (1+j)*(1, 1, −1, 1, −1, −1, 1, −1, 1, −1, 1, 1, −1, −1, −1, 1, 1, −1, 1, −1, 1, 1, 1, −1, 1, 1, 1, −1, −1, 1, 1, 1, 1, −1, −1, 1, −1, 1, 1, 1, −1, −1, 1, 1, −1, −1, 1, −1, 1, 1, 1, 1, 1, −1, 1, 1, −1, −1, −1, −1, −1), whereas j is the square root of minus one.

2. The method of claim 1 whereas the utilizing comprises performing a frequency domain to time domain conversion.

3. The method of claim 1 whereas the utilizing comprises performing an inverse Fourier transform.

4. The method of claim 1 whereas the utilizing comprises applying a weighting function.

5. The method of claim 1 whereas the utilizing comprises applying a filtering operation.

6. The method of claim 1 whereas the providing comprises generating a conjunctive sequence.

7. The method of claim 1 whereas the providing further comprises providing guard tones.

8. A method for orthogonal frequency division multiplexing (OFDM) transmission, the method comprising the stage of: defining a channel estimation sequence that is characterized by a low peak to average ratio at a significant guard to information power ratio, wherein the significant range exceeds 5 d; and transmitting by a transmitting circuitry of an OFDM device the channel estimation sequence over multiple over multiple sub-carriers, whereas the stage of defining involves utilizing a certain frequency domain sequence that comprises at least the following elements: (1+j)*(1, 1, −1, 1, −1, −1, 1, −1, 1, −1, 1, 1, −1, −1, −1, 1, 1, −1, 1, −1, 1, 1, 1, −1, 1, 1, 1, −1, −1, 1, 1, 1, 1, −1, −1, 1, −1, 1, 1, 1, −1, −1, 1, 1, −1, −1, 1, −1, 1, 1, 1, 1, 1, −1, 1, 1, −1, −1, −1, −1, −1), whereas j is the square root of minus one.

9. The method of claim 8 whereas the utilizing comprises performing a frequency domain to time domain conversion.

10. The method of claim 8 whereas the utilizing comprises performing an inverse Fourier transform.

11. The method of claim 8 whereas the utilizing comprises applying a weighting function.

12. The method of claim 8 whereas the utilizing comprises applying a filter.

13. The method of claim 8 whereas the providing comprises generating a conjunctive sequence.

14. The method of claim 8 whereas the providing further comprises providing guard tones.

15. An OFDM device, comprising: a first unit, adapted to provide a channel estimation sequence that is characterized by a low peak to average ratio over a significant range of guard to information power ratio, wherein the significant range exceeds 5 d; and a transmitting circuitry, adapted to transmit the channel estimation sequence over multiple sub-carriers, wherein the device is adapted to utilize a certain frequency domain sequence that comprises at least the following elements: (1+j)*(1, 1, −1, 1, −1, −1, 1, −1, 1, −1, 1, 1, −1, −1, −1, 1, 1, −1, 1, −1, 1, 1, 1, −1, 1, 1, 1, −1, −1, 1, 1, 1, 1, −1, −1, 1, −1, 1, 1, 1, −1, −1, 1, 1, −1, −1, 1, −1, 1, 1, 1, 1, 1, −1, 1, 1, −1, −1, −1, −1, −1), whereas j is the square root of minus one.

16. The device of claim 15 adapted to perform a frequency domain to time domain conversion.

17. The device of claim 15 adapted to perform an inverse Fourier transform.

18. The device of claim 15 adapted to apply a weighting function.

19. The device of claim 15 adapted to apply a filtering operation.

20. The device of claim 15 adapted to generate a conjunctive sequence.

21. The device of claim 15 further adapted to provide guard tones.