CN101984696B - Detection method and detection device for different format frames in wireless local area network - Google Patents
Detection method and detection device for different format frames in wireless local area network Download PDFInfo
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Abstract
The invention provides a signal detection method for different format frames in a wireless local area network and a device thereof. The method comprises the following steps: selecting the effective data from the received data; respectively judging the effective data so as to obtain a corresponding judgment result; and weighting each judgment result by utilizing the corresponding channel information and the step of synthesizing each result after weighting to obtain the final judgment result. Because the data judgment is weighted and the final judgment result is obtained by utilizing the channel information, the detection device has excellent property even under low signal to noise ratio in a task group n (TGn) standard channel and is especially suitable to be applied to the identification of an 802.11n frame format.
Description
Technical field
The present invention relates to detection method/device in a kind of WLAN, relate in particular to and be applicable to that being used among the similar 802.11n distinguish the method and apparatus of L-SIG and HT-SIG.
Background technology
802.11n as the newest standards among the WLAN, it has not only improved carrier wave efficient, and has improved the stability of system greatly.802.11n when guaranteed performance promotes, also guaranteed and the compatibility of previous version (comprise g).
802.11n middle OFDM frame comprises three kinds of forms: i.e. NON-HT, HT-mixed, HT-greenfield.Distinguish three kinds of different forms for ease, the 802.11n agreement has been stipulated the unique data structure of three kinds of different-format frames, and concrete structure is as shown in Figure 1.The difference of these three kinds of different-formats is mainly accomplished by HT-SIG field among Fig. 1, because this field has adopted special modulation system, the constellation point that is about to BPSK has been rotated pi/2 with respect to the constellation point of L-SIG.The energy that is to say HT-SIG mainly concentrates on the imaginary part, and the energy of L-SIG mainly concentrates on the real part.Therefore, in the prior art,, distinguish the data segment of HT-SIG and L-SIG, HT-SIG and BPSK modulation usually with the energy size of contrast real part and imaginary part, judge different frame formats with this at receiving terminal.This is effective under usual conditions.But than under the low signal-to-noise ratio, the false drop rate of this scheme will become a bottleneck of receiving sensitivity.Therefore be necessary to look for a kind of more high-precision signal detecting mode that has.
Summary of the invention
The object of the invention is to provide a kind of checkout gear that can discern the detection method of different-format frame effectively and adopt this detection method.
In order to achieve the above object, the technological means that the present invention adopts is: the detection method of different-format frame in a kind of WLAN, and it may further comprise the steps:
The first step is selected valid data from the data that receive, described valid data are the data of giving up after pilot tone and the unloaded wave datum;
Second step, described valid data are adjudicated respectively, obtain corresponding court verdict;
In the 3rd step, each court verdict is carried out weighting with corresponding channel information;
In the 4th step, comprehensively the result after each weighting draws final court verdict.
Further, the selection valid data described in the first step are meant and do not comprise pilot data and unloaded wave datum simultaneously through the frequency domain data behind the frequency domain equalization.
In second step valid data are carried out the real part that decision method is each data of comparison and the size of imaginary part absolute value respectively, if the real part absolute value greater than the imaginary part absolute value, then the court verdict of these data is 1, otherwise is 0.Described valid data are 48 at most.
Result after described comprehensive each weighting in the 4th step adds up the court verdict after each weighting, if the result who adds up greater than preset threshold value, then is low rate SIGNAL, otherwise is two-forty SIGNAL.
Said preset threshold value is that corresponding channel information is added up, with accumulated value 1/2 as threshold value.
The present invention also provides the checkout gear of different-format frame in a kind of WLAN, and it comprises,
Data are selected module, and it is used for selecting valid data from the data that receive, and described valid data are the data of giving up after pilot tone and the unloaded wave datum;
The data decision module, it selects the output of module to be connected with data, is used for described valid data are adjudicated respectively;
The data weighting module, its output with the data decision module is connected, and it has a channel information input, and described data weighting module receives each court verdict of data decision module output and carries out weighting with the respective channel information that receives;
The aggregation of data module, it is connected with data weighting module output, and described aggregation of data module adds up according to the weighted results of above-mentioned each data, and compares with preset threshold value, to obtain final court verdict.
Further, described data select module and data decision module to realize through comparator, and described data weighting module is realized that by multiplier described aggregation of data module realizes through accumulator and comparator.
Technique scheme can be applicable among the 802.11n; When utilizing said method to detect; Data decision to receiving was divided into for two stages, and the phase I is judged HT-greenfield form or NON-HT or HT-mixed form, if promptly detected data segment is two-forty SIGNAL (HT-SIG); Then be the HT-greenfield form, otherwise be NON-HT or HT-mixed form; Second stage is to judge it is NON-HT form or HT-mixed form, at first the speed of low rate SIGNAL (L-SIG) is analyzed, if speed is not 6M, then can directly judge speed is not the NON-HT form for the frame format of 6M; If the speed of low rate SIGNAL (L-SIG) is 6M, then follow-up data are adjudicated once more according to above-mentioned decision method, when court verdict is two-forty SIGNAL, this correspondence frame format is the HT-mixed form, another is the NON-HT form.
Detection method of the present invention and checkout gear; Because by channel information; Even under low signal-to-noise ratio, also have excellent sensitivity, guaranteed the high accuracy of testing result, it not only can be applied on the 802.11n; All can use other similar wireless systems, have the range of application of broad with a plurality of frame formats.
Description of drawings
Accompanying drawing 1 is three kinds of PPDU forms of 802.11n;
Accompanying drawing 2 is signal detecting method flow chart of the present invention;
Accompanying drawing 3 is signal supervisory instrument theory diagram of the present invention.
Embodiment
To combine accompanying drawing below, execution mode preferred for this invention will be elaborated:
In the present embodiment, we are example with three kinds of frame formats that 802.11n provides, if need discern different frame formats at receiving terminal, detect as follows according to flow process shown in Figure 2:
The first step from the data that receive, is selected valid data, promptly gives up pilot tone valid data afterwards.In the present embodiment, in order to simplify calculating and to reduce time delay, select the half the data of a symbol for use, give up two frequency pilot signs that comprise again, promptly selection 24 data wherein are as valid data;
In second step, adjudicate respectively for the data that are used to adjudicate.Promptly the data of selecting in the first step are adjudicated, the data that order is selected are d
In(n), n=1,2 ..., 23,24; Court verdict is det (n), n=1, and 2 ..., 23,24.Det (n)=(abs (real (d then
In(n)))＞abs (imag (d
In(n)))).Wherein real part is got in real () expression, and imaginary part is got in imag () expression, and abs () representes to take absolute value computing;
In the 3rd step, each court verdict is carried out weighting with corresponding channel information.Order and data d
In(n) corresponding channel information is h (n), and the court verdict after the weighting is det weighted (n).Det weighted (n)=det (n) * h (n) then.Make that decision threshold is threshold, then
In the 4th step, comprehensively the result after each weighting provides final court verdict.With the court verdict after each weighting add up
if sum det＞threshold, the signal that then receives is L-SIG; Otherwise the signal that receives is HT-SIG.
Because the 802.11n agreement has been stipulated three kinds of data formats, according to the result of aforesaid way judgement, if HT-SIG; Then can directly be judged as the HT-greenfield form, if L-SIG then is NON-HT or HT-mixed form; Therefore, also needing further judgement specifically is NON-HT form or HT-mixed form, and concrete deterministic process is: whether the speed of at first reading L-SIG is 6M; Because, according to 802.11n agreement regulation, for the HT-mixed form; The rate value one that contains among its L-SIG is decided to be 6M, and the NON-HT form does not have this special provision.Therefore, be not 6M if judge the rate value that contains among the L-SIG, then can directly judge this frame format is the NON-HT form; If the rate value that contains among the L-SIG is 6M; Then need judge back one data segment again,, then should be the HT-mixed form if back one data segment court verdict is two-forty SIGNAL according to the mode in above-mentioned four steps of the first step to the; If court verdict is low rate SIGNAL; Then should be the NON-HT form, since then, the different frame formats signal that possibly receive at receiving terminal identifies.
Above-mentioned signal detecting method both can be realized by software; Also can realize through hardware; On hardware was realized, we can be divided into functional module as shown in Figure 3 with it, and it comprises data selection module, data decision module, data weighting module and the aggregation of data module that is connected successively; The function that described each functional module is carried out is corresponding with each step of above-mentioned detection method; Data select module, data decision module to be realized by comparator respectively, and the data weighting module is realized that by multiplier the aggregation of data module is then realized by accumulator and comparator.
Thereby the invention provides a kind of signal detecting method and checkout gear that recognition performance preferably has degree of precision that under low low signal-to-noise ratio, have; It is applicable to the channel circumstance of various complicacies; According to said disclosed embodiment, those skilled in the art can realize or use the present invention.Above-described embodiment is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be within protection scope of the present invention.
Claims (7)
1. the detection method of different-format frame in the WLAN, it may further comprise the steps:
The first step is selected valid data from the data that receive, described valid data are the data of giving up after pilot tone and the unloaded wave datum;
Second step, described valid data are adjudicated respectively, obtain corresponding court verdict;
In the 3rd step, each court verdict is carried out weighting with corresponding channel information;
The 4th step; Result after comprehensive each weighting draws final court verdict: the result after described comprehensive each weighting adds up the court verdict after each weighting, if the result who adds up is greater than preset threshold value; Then be low rate SIGNAL, otherwise be two-forty SIGNAL.
2. the detection method of different-format frame in the WLAN according to claim 1; It is characterized in that: the selection valid data described in the first step are meant through the data on the frequency domain data subcarrier behind the frequency domain equalization, promptly do not comprise pilot data and unloaded wave datum.
3. the detection method of different-format frame in the WLAN according to claim 1 and 2; It is characterized in that: the method that valid data are adjudicated employing respectively in second step is the size of the real part and the imaginary part absolute value of each data of comparison; If the real part absolute value is greater than the imaginary part absolute value; Then the court verdict of these data is 1, otherwise is 0.
4. the detection method of different-format frame in the WLAN according to claim 3, it is characterized in that: the valid data that are used to adjudicate that adopted are 48 at most.
5. the detection method of different-format frame in the WLAN according to claim 1 is characterized in that: said preset threshold value is that corresponding channel information is added up, with accumulated value 1/2 as threshold value.
6. the checkout gear of different-format frame in the WLAN is characterized in that: it comprises,
Data are selected module, and it is used for selecting valid data from the data that receive, and described valid data are the data of giving up after the pilot tone;
The data decision module, it selects the output of module to be connected with data, is used for described valid data are adjudicated respectively;
The data weighting module, its output with the data decision module is connected, and it has a channel information input, and described data weighting module receives each court verdict of data decision module output and carries out weighting with the respective channel information that receives;
The aggregation of data module, it is connected with data weighting module output, and described aggregation of data module adds up according to the weighted results of above-mentioned each data, and compares with preset threshold value, to obtain final court verdict.
7. the checkout gear of different-format frame in the WLAN according to claim 6; It is characterized in that: described data select module and data decision module to realize through comparator; Described data weighting module is realized that by multiplier described aggregation of data module realizes through accumulator and comparator.
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| WO2008067123A2 (en) * | 2006-11-07 | 2008-06-05 | Nxp B.V. | Base station, system and method for notifying the presence of a first non-conforming device between beacon signal transmissions |
| CN101729481A (en) * | 2008-10-14 | 2010-06-09 | 索尼株式会社 | Wireless communication apparatus, wireless communication method, and computer program |
| CN101729203A (en) * | 2008-10-28 | 2010-06-09 | 索尼株式会社 | Wireless communication apparatus, wireless communication method, and computer program |
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| WO2008067123A2 (en) * | 2006-11-07 | 2008-06-05 | Nxp B.V. | Base station, system and method for notifying the presence of a first non-conforming device between beacon signal transmissions |
| CN101729481A (en) * | 2008-10-14 | 2010-06-09 | 索尼株式会社 | Wireless communication apparatus, wireless communication method, and computer program |
| CN101729203A (en) * | 2008-10-28 | 2010-06-09 | 索尼株式会社 | Wireless communication apparatus, wireless communication method, and computer program |
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Address after: 215021 Science and Technology Plaza 9A, Phase III, International Science and Technology Park, 1355 Jinjihu Avenue, Suzhou Industrial Park, Jiangsu Province Patentee after: Kweifa Semiconductor (Suzhou) Co., Ltd. Address before: 215021 Science and Technology Plaza 9A, Phase III, International Science and Technology Park, 1355 Jinjihu Avenue, Suzhou Industrial Park, Jiangsu Province Patentee before: Suzhou Granville Semiconductor Co. Ltd. |
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