CN101478329B - Method, apparatus and system for selecting path - Google Patents
Method, apparatus and system for selecting path Download PDFInfo
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- CN101478329B CN101478329B CN2009100084839A CN200910008483A CN101478329B CN 101478329 B CN101478329 B CN 101478329B CN 2009100084839 A CN2009100084839 A CN 2009100084839A CN 200910008483 A CN200910008483 A CN 200910008483A CN 101478329 B CN101478329 B CN 101478329B
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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 of selecting path.
Background technology
In communication system, there is multipath in microwave signal in transmitting procedure, the equipment such as wireless communication receiver need to do to received signal Multipath searching, then utilize the multipath in Search Results to carry out the processing such as AFC (Automatic Frequency Control, automatic frequency is controlled) and demodulation.
Because Multipath searching is to carry out to received signal statistical observation with the output multipath within a search cycle, yet the multipath that Multipath searching draws not is all moment within 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 occured within a search cycle, process if the footpath that will seriously decline offers AFC reconciliation circuit demodulation circuit, will reduce the performance of AFC and demodulation.
Therefore, offer before AFC reconciliation circuit demodulation circuit processes at the multipath that will search out, for guaranteeing the performance of AFC and demodulation, need to filter out effective diameter, and then after screening, effective diameter offers AFC reconciliation circuit demodulation circuit.The method of existing selecting path is all 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 a thresholding correspondence system fixing in prior art, thereby also can only satisfy wide in range performance requirement in AFC and demodulation process process, and can't further improve the performance of AFC and demodulation.
Summary of the invention
The embodiment of the present invention provides a kind of method, Apparatus and system of selecting path, 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 selecting path, comprising:
Filter out effective diameter in 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 of selecting path, comprising:
The screening module is used for arranging current thresholding, filters out effective diameter in multipath by current thresholding;
Performance detection module, the effective diameter that is used for described screening module is filtered out carries out Performance Detection, obtains performance test results;
The thresholding administration module, the performance test results that is used for obtaining according to described performance detection module is upgraded the current thresholding that described screening module arranges.
On the one hand, provide a kind of communication system, comprising:
The wireless signal dispensing device is used for sending wireless signal;
Wireless signal receiver is used for the multipath of the described wireless signal of search carrying, filters out effective diameter in 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.
The method of the selecting path that the embodiment of the present invention provides, Apparatus and system, under changeable channel circumstance, the effective diameter that current thresholding is filtered out carries out Performance Detection, upgrade (or dynamically adjust/arrange) current thresholding according to performance test results, provide guarantee for filtering out more rational footpath by more rational thresholding is set, thereby further improved the performance of AFC and demodulation.
Description of drawings
The method flow diagram of the selecting path that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of travelling carriage selecting path in the concrete scene that Fig. 2 provides for the embodiment of the present invention;
The structure drawing of device of the selecting path that Fig. 3 provides for the embodiment of the present invention;
The structure chart of the communication system that Fig. 4 provides for the embodiment of the present invention.
Embodiment
For further improving the performance of AFC and demodulation, the embodiment of the present invention provides a kind of method, Apparatus and system of selecting path.Method, the Apparatus and system of the selecting path that the embodiment of the present invention is provided below in conjunction with accompanying drawing are described in detail.
Embodiment one
At first the present invention provides a kind of method of selecting path, as shown in Figure 1, comprising:
S101 filters out effective diameter in multipath by current thresholding.
This multipath can be the multipath that directly searches through Multipath searching, can be also the substantially satisfactory 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.
The method of the selecting path that the embodiment of the present invention provides, Apparatus and system, under changeable channel circumstance, the effective diameter that current thresholding is filtered out carries out Performance Detection, upgrade (or dynamically adjust/arrange) current thresholding according to performance test results, provide guarantee for filtering out more rational footpath by more rational thresholding is set, thereby further improved the performance of AFC and demodulation.
Embodiment two
The below is applied in the method for selecting path of the present invention in concrete scene.
In the communication terminal devices such as travelling carriage, receive the frequency departure (abbreviation frequency deviation) of carrier wave between signal for eliminating base station transmitted signal and travelling carriage, need to calculate and eliminate frequency deviation by the AFC circuit.The AFC circuit manages to make the frequency of travelling carriage this locality approach as much as possible or equate with the frequency of base station, thereby better demodulates 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 by the Multipath searching module many footpaths that Multipath searching can search this signal.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, then signal to noise ratio and this fixed threshold according to this footpath compares, if the signal to noise ratio in the footpath that searches more than or equal to this fixed threshold, tentatively judges this footpath and is substantially satisfactory effective diameter or new footpath effective diameter, otherwise judges that this footpath is invalid footpath.Thereby can filter out substantially satisfactory effective diameter in the Multipath searching process.And then by follow-up screening module and AFC circuit, substantially satisfactory effective diameter is done further Screening Treatment (this processing can filter out more rational footpath within the time of symbol level).
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, according to the current thresholding of this locality, substantially satisfactory effective diameter done further screening.For example: compare according to the signal to noise ratio of substantially satisfactory effective diameter and local current thresholding, the judgement signal to noise ratio is effective diameter more than or equal to the footpath of current thresholding, otherwise judges that this footpath is invalid footpath.Then will 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 screening.Wherein, the embodiment of the present invention also can be carried out 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, arrive corresponding footpath according to the footpath information searching of effective diameter, calculate frequency deviation according to garbled effective diameter, the calculating of frequency deviation also can calculate according to the isometrical information of phase place in relevant footpath, when the frequency deviation that calculates is within the threshold range that arranges (local current frequency approach 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, namely turns down current thresholding; And when receiving the locking frequency point indication, current thresholding is updated to higher thresholding, namely 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 this moment higher thresholding can screen more footpath, 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 the thresholding after adjusting.Thereby make travelling carriage in the process according to this wireless signal demodulation, obtain better demodulation effect, avoid causing the demodulation failure because of the AFC losing lock.Wherein, the screening module also can arrange the independently thresholding footpath information suitable for demodulator circuit filters out, demodulator circuit provides corresponding performance test results (or feedback information) to adjust dynamically thresholding for the screening module to the screening module, thereby final realization arranges 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, provide guarantee for filtering out more rational footpath by more rational thresholding is set, thereby further improved the performance of AFC and demodulation.
Embodiment three
The embodiment of the present invention also provides a kind of device of selecting path, as shown in Figure 3, comprising:
Wherein the described AFC circuit of embodiment two 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 drawing frequency deviation in the threshold range of setting the time when judging unit 333 judgement frequency offset calculation unit 331, obtains the performance test results of locking frequency point; In the time of outside judging unit 333 judgement frequency offset calculation unit 331 draws the threshold range that frequency deviation arranging, obtain the performance test results of frequency losing lock.
The thresholding administration module 35 corresponding with this performance detection module 33 comprises:
The first updating block 351, the current thresholding that will screen module 31 for the performance test results of the frequency losing lock that obtains according to performance test results determining unit 337 is updated to lower thresholding;
The second updating block 353, the current thresholding that will screen module 31 for the performance test results of the locking frequency point that obtains according to performance test results determining unit 337 is updated to higher thresholding.
Wherein, this device can further include:
Multipath searching module 37 is used for receiving wireless signal, and the multipath of the described wireless signal of search carrying offers screening module 31 with the multipath that searches out.Different from the effective diameter that further filters out by screening module 31 is: the multipath of Multipath searching module 37 outputs only is the multipath of basic composite demand.The footpath of the described basic composite demand of the embodiment of the present invention and effective diameter are two different concepts, can corresponding two different grade of service, and follow-up repeating no more.
The device of the selecting path that the 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 adjust/arrange) current thresholding according to performance test results, provide guarantee for filtering out more rational footpath by more rational thresholding is set, thereby further improved the performance of AFC and demodulation.
Embodiment four
The embodiment of the present invention also provides a kind of communication system.
As shown in Figure 4, comprising:
Wireless signal dispensing device 1 is used for sending wireless signal;
In sum, the technical scheme that the embodiment of the present invention provides is simple, can be widely used in the communication equipments such as communication system and mobile terminal.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to complete by computer program, described program can be stored in a 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 store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in 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 (5)
1. the method for a selecting path, is characterized in that, comprising:
Filter out effective diameter in multipath by current thresholding;
Described effective diameter is carried out Performance Detection, obtain performance test results; Comprising: described effective diameter is offered automatic frequency control circuit, and described automatic frequency control circuit calculates frequency deviation according to described effective diameter, judge that described frequency deviation is whether in the threshold range of setting; 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;
Upgrade current thresholding according to described performance test results, comprising: according to the performance test results of described frequency losing lock, current thresholding is updated to lower thresholding; Perhaps
According to the performance test results of described locking frequency point, current thresholding is updated to higher thresholding.
2. the method for selecting path according to claim 1, is characterized in that, describedly also comprises before filtering out effective diameter in multipath by current thresholding:
Receive wireless signal, the multipath of the described wireless signal of search carrying.
3. the device of a selecting path, is characterized in that, comprising:
The screening module is used for arranging current thresholding, filters out effective diameter in multipath by current thresholding;
Performance detection module, the effective diameter that is used for described screening module is filtered out carries out Performance Detection, obtains performance test results; Wherein, 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 for threshold value is set, and judge that frequency deviation that described frequency offset calculation unit draws is whether in the threshold range of setting;
The performance test results determining unit is used for drawing frequency deviation in the threshold range of setting the time when the described frequency offset calculation of described judgment unit judges unit, obtains the performance test results of locking frequency point; In the time of outside the described frequency offset calculation of described judgment unit judges unit draws the threshold range that frequency deviation arranging, obtain the performance test results of frequency losing lock;
The thresholding administration module, the performance test results that is used for obtaining according to described performance detection module is upgraded the current thresholding that described screening module arranges, and wherein, described thresholding administration module comprises:
The 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;
The 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.
4. the device of selecting path according to claim 3, is characterized in that, also comprises:
The Multipath searching module is used for receiving wireless signal, and the multipath of the described wireless signal of search carrying offers described screening module with described multipath.
5. a communication system, is characterized in that, comprising:
The wireless signal dispensing device is used for sending wireless signal;
Wireless signal receiver is used for the multipath of the described wireless signal of search carrying, filters out effective diameter in 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;
Wherein, described wireless signal receiver comprises:
The Multipath searching module is used for receiving wireless signal, and the multipath of the described wireless signal of search carrying offers the screening module with the multipath that searches out;
The screening module is used for arranging current thresholding, filters out effective diameter in multipath by current thresholding;
Performance detection module, the effective diameter that is used for described screening module is filtered out carries out Performance Detection, obtains performance test results;
The thresholding administration module, the performance test results that is used for obtaining according to described performance detection module is upgraded the current thresholding that described screening module arranges;
Wherein, described performance detection module comprises:
The frequency offset calculation unit is used for calculating frequency deviation according to the effective diameter that the screening module filters out;
Judging unit is used for threshold value is set, and judge that frequency deviation that described frequency offset calculation unit draws is whether in the threshold range of setting;
The performance test results determining unit is used for drawing frequency deviation in the threshold range of setting the time when the described frequency offset calculation of described judgment unit judges unit, obtains the performance test results of locking frequency point; In the time of outside the described frequency offset calculation of described judgment unit judges unit draws the threshold range that frequency deviation arranging, obtain the performance test results of frequency losing lock;
Described thresholding administration module comprises:
The 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;
The 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.
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| 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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| CN101478329B true CN101478329B (en) | 2013-06-05 |
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|---|---|---|---|---|
| CN1469655A (en) * | 2002-06-20 | 2004-01-21 | 株式会社Ntt都科摩 | Project for selecting threshold to realize path selection with optimum path in radio communication |
| CN1588834A (en) * | 2004-09-16 | 2005-03-02 | 北京天碁科技有限公司 | Frequency deviation evaluation device and method |
| CN101018225A (en) * | 2006-12-19 | 2007-08-15 | 北京创毅视讯科技有限公司 | OFDM symbol and frequency synchronization and channel style estimating method |
| CN101026408A (en) * | 2007-01-19 | 2007-08-29 | 重庆重邮信科股份有限公司 | Frequency fine correction method and device for time division-synchronous CDMA system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1469655A (en) * | 2002-06-20 | 2004-01-21 | 株式会社Ntt都科摩 | Project for selecting threshold to realize path selection with optimum path in radio communication |
| CN1588834A (en) * | 2004-09-16 | 2005-03-02 | 北京天碁科技有限公司 | Frequency deviation evaluation device and method |
| CN101018225A (en) * | 2006-12-19 | 2007-08-15 | 北京创毅视讯科技有限公司 | OFDM symbol and frequency synchronization and channel style estimating method |
| CN101026408A (en) * | 2007-01-19 | 2007-08-29 | 重庆重邮信科股份有限公司 | Frequency fine correction method and device for time division-synchronous CDMA system |
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