Frequency domain OFDM symbol generation method and preamble symbol generation method
Frequency domain OFDM symbol generation method and preamble symbol generation method
 CN 105,024,963 A
 Filed: 05/05/2014
 Published: 11/04/2015
 Est. Priority Date: 04/30/2014
 Status: Active Application
First Claim
1. a generation method for frequencydomain OFDM symbol, is characterized in that, comprise the steps:
 Frequency domain generates fixed sequence program and signaling sequence respectively;
Fixed sequence program and signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence;
Null sequence subcarrier is filled respectively to form the frequencydomain OFDM symbol of predetermined length in described effective subcarrier both sides.
Chinese PRB Reexamination
Abstract
The invention discloses a frequency domain OFDM symbol generation method and a preamble symbol generation method. The frequency domain OFDM symbol generation method comprises the steps of: generating fixed sequences and signaling sequences in a frequency domain respectively; filling the fixed sequences and the signaling sequences which are arranged in an odd even interleaving manner to an effective subcarrier; and filling zerosequence subcarriers on both sides of the effective subcarrier to form a frequency domain OFDM symbol with a preset length. According to the technical scheme provided by the invention, the frequency domain OFDM symbol generation method and preamble symbol generation method prevent the generated signaling sequences from having a property of circular shift or circular shift plus phase shift in a time domain, solves the degradation problem of channel estimation performance of the frequency domain, and further ensures that a receiving end can process and receive signals when carrier frequency deviation ranges from 500kHz to 500kHz.

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22 Claims

1. a generation method for frequencydomain OFDM symbol, is characterized in that, comprise the steps:

Frequency domain generates fixed sequence program and signaling sequence respectively; Fixed sequence program and signaling sequence are filled on effective subcarrier, and the arrangement in oem character set between described fixed sequence program and signaling sequence; Null sequence subcarrier is filled respectively to form the frequencydomain OFDM symbol of predetermined length in described effective subcarrier both sides.


2. the generation method of frequencydomain OFDM symbol as claimed in claim 1, is characterized in that, frequency domain generates signaling sequence and comprises:

Determine length and the number of signaling sequence; Determine that CAZAC sequence generates the root value in formula based on the length of described signaling sequence and number;
Wherein, the length of signaling sequence is less than or equal to root value, and root value is greater than or equal to the twice of the number of signaling sequence;Select different q values to produce CAZAC sequence, wherein the number of q value equals the number of signaling sequence, and any two q value sums are not equal to root value;
And the CAZAC sequence produced needs through cyclic shift, the figure place of cyclic shift is determined by corresponding root value and q value;Number according to determined signaling sequence chooses described signaling sequence from all CAZAC sequences.


3. the generation method of frequencydomain OFDM symbol as claimed in claim 2, is characterized in that, described signaling sequence length is 353, the number of signaling sequence is 128, root value is 353;
The value of q value is all numerical value in following form;

4. the generation method of frequencydomain OFDM symbol as claimed in claim 1, is characterized in that, frequency domain generates signaling sequence and comprises:

Determine length and the number of signaling sequence; Determine that CAZAC sequence generates several root values in formula based on the length of described signaling sequence and number;
Wherein, the length of signaling sequence is less than or equal to the minimum value in several selected root values, and several selected root value sums are greater than or equal to the twice of the number of signaling sequence;For each root value, select different q values to produce CAZAC sequence, wherein the number of q value is less than or equal to 1/2 of corresponding root value, and any two q value sums are not equal to corresponding root value;
And the CAZAC sequence produced needs through cyclic shift, the figure place of cyclic shift is determined by corresponding root value and q value;Number according to determined signaling sequence chooses described signaling sequence from each the CAZAC sequence obtained.


5. the generation method of frequencydomain OFDM symbol as claimed in claim 4, is characterized in that, for each root value, select the number of q value different, and the number summation of these q values equals the number of signaling sequence.

6. the generation method of frequencydomain OFDM symbol as claimed in claim 4, it is characterized in that, a root value in several root values is chosen for the length of signaling sequence.

7. the generation method of frequencydomain OFDM symbol as claimed in claim 6, it is characterized in that, the described length according to determined signaling sequence is chosen described signaling sequence and is comprised from each the CAZAC sequence obtained:
 determine described signaling sequence according to the CAZAC sequence that the root value of the length being chosen for signaling sequence produces.

8. the generation method of the frequencydomain OFDM symbol as described in claim 2 or 4, is characterized in that, described root value is prime number.

9. the generation method of frequencydomain OFDM symbol as claimed in claim 3, is characterized in that, the generation of described fixed sequence program calculates based on the signaling sequence produced.

10. the generation method of frequencydomain OFDM symbol as claimed in claim 9, it is characterized in that, described fixed sequence program is:

11.
The generation method of 11. frequencydomain OFDM symbols as claimed in claim 1, it is characterized in that, the length of described fixed sequence program is equal with the length of described signaling sequence, and this length is less than 1/2 of described predetermined length.

12.
The generation method of 12. frequencydomain OFDM symbols as claimed in claim 1, it is characterized in that, fill null sequence subcarrier respectively in described effective subcarrier both sides and comprise with the frequencydomain OFDM symbol forming predetermined length:  fill the null sequence subcarrier of equal length respectively in described effective subcarrier both sides to form the frequencydomain OFDM symbol of predetermined length.

13.
The generation method of 13. frequencydomain OFDM symbols as claimed in claim 8, is characterized in that, the length of the null sequence subcarrier that every side is filled is greater than critical length value, and this critical length value is determined by systematic sampling rate, symbol rate and predetermined length.

14.
The generation method of 14. frequencydomain OFDM symbols as claimed in claim 1, it is characterized in that, described predetermined length is 1024.

15.
The generation method of 15. frequencydomain OFDM symbols as claimed in claim 1, it is characterized in that, described fixed sequence program and signaling sequence are permanent mode sequence.

16.
The generation method of 16. frequencydomain OFDM symbols as claimed in claim 1, it is characterized in that, described fixed sequence program is identical with the average power of signaling sequence or different.

17. In 17. 1 kinds of physical frames, the generation method of leading symbol, is characterized in that, comprise the steps:

Generation method according to frequencydomain OFDM symbol according to claim 1 obtains the frequencydomain OFDM symbol of predetermined length; Change to obtain timedomain OFDM symbol as inverse discrete Fourier transform to the frequencydomain OFDM symbol of this predetermined length; Determine circulating prefixlength; The timedomain OFDM symbol of described circulating prefixlength is intercepted as Cyclic Prefix from described timedomain OFDM symbol; Timedomain OFDM symbol based on the described circulating prefixlength of abovementioned intercepting generates modulation signal; Leading symbol is generated based on described Cyclic Prefix, described timedomain OFDM symbol and described modulation signal.


18.
In 18. physical frames as claimed in claim 17, the generation method of leading symbol, is characterized in that, also comprises after the timedomain OFDM symbol of the described described circulating prefixlength based on abovementioned intercepting generates modulation signal: 
Determine the length of described modulation signal; Based on the length of this modulation signal, for intercepting in the part timedomain OFDM symbol of Cyclic Prefix in described timedomain OFDM symbol, by selecting different original position command transmitting information.


19.
The generation method of leading symbol in 19. physical frames as claimed in claim 18, it is characterized in that, described signaling information comprises hook information, transmitter flag information or other transformation parameters.

20.
The generation method of leading symbol in 20. physical frames as claimed in claim 17, is characterized in that, described predetermined length is 1024, the length of described circulating prefixlength and described modulation signal is 512.

21.
In 21. physical frames as claimed in claim 17, the generation method of leading symbol, is characterized in that, the timedomain OFDM symbol of the described described circulating prefixlength based on abovementioned intercepting generates modulation signal and comprises: 
A frequency displacement sequence is set; The timedomain OFDM symbol of the timedomain OFDM symbol of described circulating prefixlength or the described circulating prefixlength of part is multiplied by described frequency displacement sequence to obtain described modulation signal.


22.
In 22. physical frames as claimed in claim 17, the generation method of leading symbol, is characterized in that, described based on described Cyclic Prefix, described timedomain OFDM symbol and described modulation signal generate leading symbol comprise: Using the splicing of described Cyclic Prefix in the front portion of timedomain OFDM symbol as protection interval, and using described modulation signal splicing at the rear portion of timedomain OFDM symbol as frequency modulation part to generate leading symbol.
Specification(s)