CN101478329A - Method, apparatus and system for selecting path - Google Patents
Method, apparatus and system for selecting path Download PDFInfo
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- CN101478329A CN101478329A CNA2009100084839A CN200910008483A CN101478329A CN 101478329 A CN101478329 A CN 101478329A CN A2009100084839 A CNA2009100084839 A CN A2009100084839A CN 200910008483 A CN200910008483 A CN 200910008483A CN 101478329 A CN101478329 A CN 101478329A
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Abstract
The embodiment of the invention provides a method, a device and a system for filtering paths, relates to the communication technology field, and aims to satisfy higher performance requirements of AFC and demodulation. The method comprises the steps as follows: effective paths are filtered from multiple paths through a current threshold; the effective paths are processed through performance testing to obtain a performance testing result; and the current threshold is refreshed according to the performance testing result. The technical proposal provided by the embodiment can be widely applied to communication equipment such as a communication system, a mobile terminal, etc.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method, Apparatus and system that screens the footpath.
Background technology
In communication system, there is multipath in microwave signal in transmission course, equipment such as wireless communication receiver then need to do to received signal Multipath searching, utilize the multipath in the Search Results to carry out processing such as AFC (Automatic Frequency Control, automatic frequency control) and demodulation then.
Because Multipath searching is to carry out statistical observation to received signal with the output multipath in a search cycle, yet the multipath that Multipath searching draws not is all moment in a search cycle all to keep signal preferably.In wireless channel, when the channel circumstance of Multipath searching in the cycle changes, can cause the symbol in some footpath that serious decline took place in a search cycle, handle, will reduce the performance of AFC and demodulation if the footpath that will seriously decline offers AFC reconciliation circuit demodulation circuit.
Therefore, offer before AFC reconciliation circuit demodulation circuit handles,, need filter out effective diameter, and then will screen the back effective diameter and offer AFC reconciliation circuit demodulation circuit for guaranteeing the performance of AFC and demodulation at the multipath that will search out.The method in existing screening footpath all is to filter out effective diameter by a fixing thresholding.Yet, the inventor is in realizing process of the present invention, find wide in range performance requirement of the only corresponding system of thresholding fixing in the prior art, thereby also can only satisfy wide in range performance requirement in AFC and the demodulation process process, and can't further improve the performance of AFC and demodulation.
Summary of the invention
The embodiment of the invention provide a kind of screen the footpath method, Apparatus and system, with satisfy AFC and demodulation higher performance requirement.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, provide a kind of method of screening the footpath, comprising:
Filter out effective diameter in the multipath by current thresholding;
Described effective diameter is carried out Performance Detection, obtain performance test results;
Upgrade current thresholding according to described performance test results.
On the one hand, provide a kind of device that screens the footpath, comprising:
The screening module is used to be provided with current thresholding, filters out effective diameter in the multipath by current thresholding;
Performance detection module is used for the effective diameter that described screening module filters out is carried out Performance Detection, obtains performance test results;
The thresholding administration module is used for upgrading the current thresholding that described screening module is provided with according to the performance test results that described performance detection module obtains.
On the one hand, provide a kind of communication system, comprising:
The wireless signal dispensing device is used to send wireless signal;
The wireless signal receiving system is used to search for the multipath of the described wireless signal of carrying, filters out effective diameter in the multipath by current thresholding, and described effective diameter is carried out Performance Detection, obtains performance test results, upgrades current thresholding according to described performance test results.
Method, the Apparatus and system in the screening footpath that the embodiment of the invention provides, under changeable channel circumstance, the effective diameter that current thresholding is filtered out carries out Performance Detection, upgrade (or dynamically adjustment/setting) current thresholding according to performance test results, then provide guarantee by more rational thresholding is set, thereby further improved the performance of AFC and demodulation for filtering out more rational footpath.
Description of drawings
The screening method flow diagram directly that Fig. 1 provides for the embodiment of the invention;
The schematic diagram in travelling carriage screening footpath in the concrete scene that Fig. 2 provides for the embodiment of the invention;
The screening structure drawing of device directly that Fig. 3 provides for the embodiment of the invention;
The structure chart of the communication system that Fig. 4 provides for the embodiment of the invention.
Embodiment
For further improving the performance of AFC and demodulation, the embodiment of the invention provides a kind of method, Apparatus and system that screens the footpath.Below in conjunction with accompanying drawing screening method, the Apparatus and system directly that the embodiment of the invention provides done detailed description.
Embodiment one
The present invention at first provides a kind of method of screening the footpath, as shown in Figure 1, comprising:
S101 filters out effective diameter in the multipath by current thresholding.
This multipath can be the multipath that directly searches through Multipath searching, also can be the satisfactory substantially effective diameter through obtaining after other Screening Treatment in the Multipath searching process.
S102 carries out Performance Detection to effective diameter, obtains performance test results.
S103 upgrades current thresholding according to performance test results.
Method, the Apparatus and system in the screening footpath that the embodiment of the invention provides, under changeable channel circumstance, the effective diameter that current thresholding is filtered out carries out Performance Detection, upgrade (or dynamically adjustment/setting) current thresholding according to performance test results, then provide guarantee by more rational thresholding is set, thereby further improved the performance of AFC and demodulation for filtering out more rational footpath.
Embodiment two
The method of below the present invention being screened the footpath is applied in the concrete scene.
In communication terminal devices such as travelling carriage,, need calculate and eliminate frequency deviation by the AFC circuit for eliminating the frequency departure (abbreviation frequency deviation) of carrier wave between base station transmit signals and the travelling carriage received signal.The frequency that the AFC circuit manages to make travelling carriage this locality and the frequency of base station as much as possible near or equate, thereby better demodulate the signal of base station transmission.In the present embodiment, carry out the described step of S102 by the AFC circuit.
As shown in Figure 2, this travelling carriage mainly comprises Multipath searching module, screening module, AFC reconciliation circuit demodulation circuit; Wherein, the AFC circuit is used for current effective diameter execution performance by the screening module is detected, and obtains performance test results, and this performance test results is fed back to the screening module again.Specifically comprise:
After travelling carriage receives wireless signal, do many footpaths that Multipath searching can search this signal by the Multipath searching module.Wherein, in the Multipath searching process, also can carry out simple preliminary treatment to the footpath that searches, for example: a fixing thresholding is set, signal to noise ratio and this fixed threshold according to this footpath compares then, if the signal to noise ratio in the footpath that searches, judges tentatively then that this directly is satisfactory substantially effective diameter or new footpath effective diameter more than or equal to this fixed threshold, otherwise judges that this directly is invalid footpath.Thereby in the Multipath searching process, can filter out satisfactory substantially effective diameter.And then satisfactory substantially effective diameter is done further Screening Treatment (this processing can filter out more rational footpath in the time of symbol level) by follow-up screening module and AFC circuit.
Be provided with the thresholding of the more rational effective diameter of screening in the screening module of travelling carriage, after the screening module receives the effective diameter indication, satisfactory substantially effective diameter done further screening according to the current thresholding of this locality.For example: compare according to the signal to noise ratio of satisfactory substantially effective diameter and local current thresholding, judge that signal to noise ratio is an effective diameter more than or equal to the footpath of current thresholding, otherwise judge that this directly is invalid footpath.To send to the AFC circuit by the indication of AFC effective diameter by the footpath information (can find the wireless signal in corresponding footpath according to footpath information) of the effective diameter after the screening then.Wherein, the embodiment of the invention also can be carried out the setting and the Screening Treatment of thresholding according to other footpath information such as phase place of effective diameter.
After the AFC circuit receives the effective diameter indication, footpath information searching according to effective diameter arrives corresponding footpath, calculate frequency deviation according to garbled effective diameter, the calculating of frequency deviation also can draw according to the isometrical information calculations of phase place in relevant footpath, when the frequency deviation that calculates is within the threshold range that is provided with (local current frequency near or equal to expect frequency), sends locking frequency point and indicate; When the frequency deviation that calculates is outside the threshold value of setting, send the indication of frequency losing lock.
The screening module is upgraded current thresholding according to the performance test results (locking frequency point/losing lock indication) of AFC again.For example: when receiving the indication of frequency losing lock, current thresholding is updated to lower thresholding, promptly turns down current thresholding; And when receiving the locking frequency point indication, current thresholding is updated to higher thresholding, promptly heighten current thresholding.Wherein, when the AFC non-locking, it is subject matter that AFC restrains as early as possible, and at this moment, the footpath of adopting lower thresholding to screen is less, the AFC converges faster; And after the AFC locking, enter AFC for fear of noise path and cause the AFC losing lock, adopt higher thresholding can screen more footpath this moment, thereby guarantee that AFC locks steadily and surely, do not disturbed by weak footpath.
In the present embodiment, can also directly be used for filtering out rational footpath for demodulator circuit through adjusted thresholding.Thereby make travelling carriage in process, obtain better demodulation effect, avoid causing the demodulation failure because of the AFC losing lock according to this wireless signal demodulation.Wherein, the screening module also can be provided with independently, and thresholding comes to filter out suitable footpath information for demodulator circuit, demodulator circuit provides corresponding performance test results (or feedback information) to adjust thresholding dynamically for the screening module to the screening module, thereby final realization is provided with moderate thresholding demodulation performance is totally improved.
In the present embodiment, the AFC circuit of travelling carriage carries out Performance Detection to the effective diameter that current thresholding filters out, the screening module is updated to more rational thresholding according to this performance test results with current thresholding again, then provide guarantee by more rational thresholding is set, thereby further improved the performance of AFC and demodulation for filtering out more rational footpath.
Embodiment three
The embodiment of the invention also provides a kind of device that screens the footpath, as shown in Figure 3, comprising:
Wherein embodiment two described AFC circuit can be deployed in this performance detection module 33.Further, performance detection module 33 comprises:
Frequency offset calculation unit 331 is used for calculating frequency deviation according to the effective diameter that screening module 31 filters out;
Performance test results determining unit 335 is used for obtaining the performance test results of locking frequency point when judging unit 333 judges that frequency offset calculation unit 331 draw in the threshold range that frequency deviation is being provided with; When judging unit 333 judges that frequency offset calculation unit 331 draw outside the threshold range that frequency deviation is being provided with, obtain the performance test results of frequency losing lock.
The thresholding administration module 35 corresponding with this performance detection module 33 comprises:
Wherein, this device can further include:
The device in the screening footpath that present embodiment provides, under changeable channel circumstance, the effective diameter that 33 pairs of current thresholdings of performance detection module filter out carries out Performance Detection, screening module 31 is upgraded (or dynamically adjustment/setting) current thresholding according to performance test results, then provide guarantee by more rational thresholding is set, thereby further improved the performance of AFC and demodulation for filtering out more rational footpath.
Embodiment four
The embodiment of the invention also provides a kind of communication system.
As shown in Figure 4, comprising:
Wireless signal dispensing device 1 is used to send wireless signal;
Wireless signal receiving system 3, (this multipath can be to screen the multipath that preliminary treatment directly searches through not doing behind the Multipath searching to be used for the multipath of search carrying wireless signal (this wireless signal by wireless signal dispensing device 1 transmissions), also can be satisfactory substantially effective diameter in the Multipath searching process) through obtaining after other screening preliminary treatment, filter out effective diameter in the multipath by current thresholding, effective diameter is carried out Performance Detection, obtain performance test results, upgrade current thresholding according to performance test results.
Wireless signal receiving system 3 in this system can be a screening device directly shown in Figure 3, and concrete internal structure and function distributing reference example three repeat no more.Under changeable channel circumstance, the effective diameter that 3 pairs of current thresholdings of the wireless signal receiving system of this system filter out carries out Performance Detection, upgrade (or dynamically adjustment/setting) current thresholding according to performance test results, then provide guarantee by more rational thresholding is set, thereby provide guarantee for the performance in the signal processing such as the AFC of wireless signal receiving system 3 this locality and demodulation for filtering out more rational footpath.
In sum, the technical scheme that the embodiment of the invention provides is simple, can be widely used in the communication equipments such as communication system and portable terminal.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of method of screening the footpath is characterized in that, comprising:
Filter out effective diameter in the multipath by current thresholding;
Described effective diameter is carried out Performance Detection, obtain performance test results;
Upgrade current thresholding according to described performance test results.
2, according to the method in the described screening footpath of claim 1, it is characterized in that, described described effective diameter carried out Performance Detection, obtain performance test results and comprise:
Described effective diameter is offered automatic frequency control circuit;
Described automatic frequency control circuit detects described effective diameter execution performance, obtains performance test results.
3, according to the method in the described screening of claim 2 footpath, it is characterized in that described automatic frequency control circuit detects described effective diameter execution performance, obtains performance test results and comprises:
Calculate frequency deviation according to described effective diameter;
Judge that described frequency deviation is whether in the threshold range that is provided with;
When described frequency deviation is in the threshold range of setting, obtain the performance test results of locking frequency point; When described frequency deviation is outside the threshold range of setting, obtain the performance test results of frequency losing lock.
4, according to the method in the described screening footpath of claim 3, it is characterized in that, describedly upgrade current thresholding according to described performance test results and comprise:
Performance test results according to described frequency losing lock is updated to lower thresholding with current thresholding; Perhaps
Performance test results according to described locking frequency point is updated to higher thresholding with current thresholding.
According to the method in the described screening of claim 1 footpath, it is characterized in that 5, the described effective diameter that filters out in the multipath by current thresholding also comprises before:
Receive wireless signal, the multipath of the described wireless signal of search carrying.
6, a kind of device that screens the footpath is characterized in that, comprising:
The screening module is used to be provided with current thresholding, filters out effective diameter in the multipath by current thresholding;
Performance detection module is used for the effective diameter that described screening module filters out is carried out Performance Detection, obtains performance test results;
The thresholding administration module is used for upgrading the current thresholding that described screening module is provided with according to the performance test results that described performance detection module obtains.
7, according to the device in the described screening of claim 6 footpath, it is characterized in that described performance detection module comprises:
The frequency offset calculation unit, the effective diameter that is used for filtering out according to described screening module calculates frequency deviation;
Judging unit is used to be provided with threshold value, judges that frequency deviation that described frequency offset calculation unit draws is whether in the threshold range that is provided with;
The performance test results determining unit is used for drawing frequency deviation in the threshold range that is provided with the time when the described frequency offset calculation of described judgment unit judges unit, obtains the performance test results of locking frequency point; When the described frequency offset calculation of described judgment unit judges unit draws frequency deviation outside the threshold range that is provided with the time, obtain the performance test results of frequency losing lock.
8, according to the device in the described screening of claim 7 footpath, it is characterized in that described thresholding administration module comprises:
First updating block, the performance test results that is used for the frequency losing lock that obtains according to described performance test results determining unit is updated to lower thresholding with the current thresholding of described screening module;
Second updating block, the performance test results that is used for the locking frequency point that obtains according to described performance test results determining unit is updated to higher thresholding with the current thresholding of described screening module.
9, according to the device in the arbitrary described screening of claim 6 to 8 footpath, it is characterized in that, also comprise:
The Multipath searching module is used to receive wireless signal, and the multipath of the described wireless signal of search carrying offers described screening module with described multipath.
10, a kind of communication system is characterized in that, comprising:
The wireless signal dispensing device is used to send wireless signal;
The wireless signal receiving system is used to search for the multipath of the described wireless signal of carrying, filters out effective diameter in the multipath by current thresholding, and described effective diameter is carried out Performance Detection, obtains performance test results, upgrades current thresholding according to described performance test results.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100084839A CN101478329B (en) | 2009-02-03 | 2009-02-03 | Method, apparatus and system for selecting path |
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| CN2009100084839A CN101478329B (en) | 2009-02-03 | 2009-02-03 | Method, apparatus and system for selecting path |
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| CN101478329A true CN101478329A (en) | 2009-07-08 |
| CN101478329B CN101478329B (en) | 2013-06-05 |
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| CN2009100084839A Expired - Fee Related CN101478329B (en) | 2009-02-03 | 2009-02-03 | Method, apparatus and system for selecting path |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013023367A1 (en) * | 2011-08-17 | 2013-02-21 | 深圳市英威腾电气股份有限公司 | Method and device for photovoltaic inverter correction and driving |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4242606B2 (en) * | 2002-06-20 | 2009-03-25 | 株式会社エヌ・ティ・ティ・ドコモ | Communication control system, communication control method, mobile station and base station |
| CN100364254C (en) * | 2004-09-16 | 2008-01-23 | 北京天碁科技有限公司 | Frequency deviation evaluation device and method |
| CN101018225B (en) * | 2006-12-19 | 2010-04-07 | 北京创毅视通科技有限公司 | Ofdm symbol and frequency synchronization method |
| CN101026408B (en) * | 2007-01-19 | 2011-10-05 | 重庆重邮信科通信技术有限公司 | Frequency fine correction method and device for time division-synchronous CDMA system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013023367A1 (en) * | 2011-08-17 | 2013-02-21 | 深圳市英威腾电气股份有限公司 | Method and device for photovoltaic inverter correction and driving |
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| CN101478329B (en) | 2013-06-05 |
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Granted publication date: 20130605 Termination date: 20170203 |