CN1917378A - Method for restraining same frequency interference in wireless communication system - Google Patents
Method for restraining same frequency interference in wireless communication system Download PDFInfo
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- CN1917378A CN1917378A CN 200510091503 CN200510091503A CN1917378A CN 1917378 A CN1917378 A CN 1917378A CN 200510091503 CN200510091503 CN 200510091503 CN 200510091503 A CN200510091503 A CN 200510091503A CN 1917378 A CN1917378 A CN 1917378A
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Abstract
The method comprises: the orthogonal state between the main signals desired by radio receiving system and the preamble of interference signals in same frequency is used to calculated the same frequency signals power strength in order to discriminate those same frequency signals and further to receive the main signals. The radio receiving system can also figures out the relative bearing information and transmits it to the radio transmitting system; the radio transmitting system can enhance the main signal strength and makes the interference source to reduce the strength of interference signal strength.
Description
Technical field
The invention relates to a kind of method that suppresses co-channel interference, refer to especially a kind ofly be applicable to that one uses the method that suppresses co-channel interference in the wireless telecommunication system of preamble.
Background technology
Communication system is in the human lives of present stage, occupy very important one seat, the communication system of every mobile phone, networking or various wire and wireless, all inseparable with life, especially wireless communication system, as: IEEE 802.16, UWB... etc., one of core of future development especially.In above-mentioned no communication system, co-channel interference is a known extremely important problem of needing solution badly that influence receives.
Co-channel interference be meant receive auspicious when receiving auspicious certain set specific frequency signal launched of emission, also received the same frequency signal that contiguous interference source is launched simultaneously, because the two frequency is identical, the filter of demodulating process can not separate the two, so just in case the signal of interference source is too powerful, cause receiving terminal again can not differentiate the signal of transmitting terminal probably, and then cause the puzzlement in the communication.Generally speaking, can handle transmitting in existing systems with the STC coding techniques, be reduced into original signal so that decode, or add that at receiving terminal eqalizing cricuit goes to carry out signal processing at receiving terminal.Yet this is when the interference source signal is too powerful, and the effect of above-mentioned means just can decline to a great extent, that is error rate can significantly rise, and makes that whole communication system can't normal operation.
Summary of the invention
The objective of the invention is to, a kind of method that suppresses co-channel interference in the wireless telecommunication system is provided, it can effectively suppress co-channel interference in the wireless telecommunication system, improves signal noise ratio, and promotes communication quality.
Another object of the present invention is to, a kind of method that suppresses co-channel interference in the wireless telecommunication system is provided, and it can obtain the relative position of wireless receiving system, and promote toward the counterparty to main signal emissive porwer, with the raising signal noise ratio, and promote communication quality.
The present invention includes a kind of method that suppresses co-channel interference in the wireless telecommunication system, is to be used for a wireless receiving system, it is characterized in that this method is may further comprise the steps:
Receiving step frequently together, be to receive plural set specific frequency signal, these set specific frequency signals are to include a main signal and an at least one interference signal, this main signal is sent by a wireless transmitting system, and include at least one preamble, and this at least one preamble of this main signal be with this at least one interference signal be orthogonal;
One power level calculation procedure is the power level that calculates these set specific frequency signals according to the preamble of these set specific frequency signals respectively;
One power level comparison step is in order to compare the power level of these set specific frequency signals; And
One filtration step is to select to be higher than a preset value person as this main signal in the power level of these set specific frequency signals, and filters this at least one interference signal.
It also comprises:
One computer azimuth information step is an azimuth information that goes out this wireless transmitting system according to this main calculated signals; And
One back coupling information step is to send an echo message, and wherein this echo message is to comprise this azimuth information.
It comprises that also one strengthens signals step, is when this wireless transmitting system receives this echo message, strengthens azimuthal this main signal emissive porwer of past this wireless receiving system according to this azimuth information.
It also comprises a notice interference source step, be this azimuth information to be sent at least one interference source by this wireless transmitting system, wherein, this at least one interference source is to send this at least one interference signal, and this at least one interference source is azimuthal this at least one interference signal emissive porwer that weakens past this wireless receiving system according to this azimuth information.
It also comprises and weakens the interference step, is when at least one interference source that sends this at least one interference signal receives this this echo message, weakens azimuthal this interference signal emissive porwer toward this wireless receiving system according to this azimuth information.
The present invention also comprises a kind of method that suppresses co-channel interference in the wireless telecommunication system, is to be used for a wireless transmitting system, it is characterized in that this method is may further comprise the steps:
The main signals step of one emission is emission one main signal to a wireless receiving system, and this main signal is to include at least one preamble, and uses a characteristic frequency;
One receives the echo message step, is to receive by the echo message that this wireless receiving system sent, and this echo message is to include an azimuth information, and it is to be the result of this wireless receiving system according to this main calculated signals; And
One strengthens signals step, is azimuthal this main signal emissive porwer of strengthening past this wireless receiving system according to this azimuth information.
Wherein, also include a notice interference source step after this reception echo message step, be that this azimuth information is sent at least one interference source, this at least one interference source is to send at least one interference signal, and this at least one interference source is azimuthal this at least one interference signal emissive porwer that weakens past this wireless receiving system according to this azimuth information.
Description of drawings
For further specifying concrete technology contents of the present invention, below in conjunction with embodiment and accompanying drawing describes in detail as after, wherein:
Fig. 1 is the system schematic of a preferred embodiment of the present invention.
Fig. 2 is the receiving system operation workflow figure of a preferred embodiment of the present invention.
Fig. 3 is the emission system operation workflow figure of a preferred embodiment of the present invention.
Embodiment
The present invention can be applicable in the wireless telecommunication system that uses preposition synchronizing signal, Fig. 1 then is the system schematic of a preferred embodiment of the present invention, wherein, each communication individuality in the system all disposes a unique orthogonal preamble (Preamble), to allow communication the other side be able to finish physical layer signal Synchronization with this communication individuality by this preamble.As shown in the figure, wireless transmitting system, that is base station 10, emission one main signal 101 to one wireless receiving systems, that is mobile phone 20, interference source in this example then is another base station 30, the interference signal 301 of the same frequency that base station 30 is launched, and another is equally all received by mobile phone 20 through reflection interference signal 302, because main signal 101 and interference signal 301,302 all use identical frequency, so general mobile phone 20 is difficult to the emerald green solely main signal 101 of taking-up and produces co-channel interference, therefore must utilize other modes interference signal 301,302 to be filtered or strengthens the transmitting power of main signal 101.
Be this routine wireless receiving system operation workflow figure with reference to Fig. 2 in the lump please, at first, mobile phone 20 can receive the main signal 101 of same frequency, and interference signal 301,302 (S201), because main signal 101 and interference signal 301,302 employed preambles are orthogonal, therefore mobile phone 20 can be calculated main signal 101 respectively by these orthogonal preambles, and interference signal 301,302 signal power strength, and compare the signal power strength (S202) of above-mentioned each signal, because generally speaking the signal power strength that main signal 101 is calculated all can be bigger than remaining interference signal 301,302 signal power strength, so mobile phone 20 can be set an adjustable predetermined threshold value, the signal power strength that makes main signal 101 be calculated can surpass above-mentioned predetermined threshold value, and interference signal 301,302 signal power strength can be lower than above-mentioned predetermined threshold value.Therefore mobile phone 20 can be utilized the preamble of main signal 101, and then the reception spatial filter of calculating (Spatial Filter) itself, as wisdom antenna (Smart Antenna) (scheming not formula) weight, so that main signal 101 is set bigger power gain, and to interference signal 301,302 set less power gain, further main signal 101 are separated according to this, and are filtered all the other interference signals 301,302 (S203).Therefore, mobile phone 20 can be taken out required main signal 101 smoothly, and in addition demodulation, can improve signal noise ratio, reduce error rate.And owing to may have multi-path transmission in the radio channel, this can cause the situation of the people having the same aspiration and interest (Coherent) signal, and have a strong impact on the usefulness of aerial array, when therefore in the S203 step, calculating the weight of aerial array, can be according to the number of antennas number, the processing that adds space smoothing (Spatial Smoothing) solves the problem of coherent signal.
Yet, mobile phone 20 more can calculate relative orientation information (S204) with base station 10 by main signal 101, and send an echo message, in echo message, comprised above-mentioned azimuth information (S205), and base station 20 can be strengthened just toward the signal power strength of the main signal 101 in mobile phone 20 orientation after receiving.In addition, if interference source (base station 30) is also received above-mentioned echo message, then can weaken toward the signal power strength (S206) of the interference signal 301,302 in mobile phone 20 orientation, so the signal noise ratio of whole communication system more can effectively promote.
Fig. 3 then is this routine wireless transmitting system operation workflow figure, as shown in the figure, base station 10 can be launched a main signal 101 and give mobile phone 20 (S301), and mobile phone 20 receives main signals 101 and calculate azimuth information with base station 10 after, mobile phone 20 will be sent an echo message that comprises azimuth information and give base station 10 (S302), base station 10 can be strengthened the main signal 101 power emission intensity (S303) of past mobile phone 20 directions according to this azimuth information, and reinforms the interference signal 301 that interference source (base station 30) weakens past mobile phone 20 directions, 302 power emission intensity.Therefore, the signal noise ratio of communication system can effectively improve and promote communication quality.
The foregoing description only is to give an example for convenience of description, and the interest field that the present invention advocated should be as the criterion so that claim is described certainly, but not only limits to above-mentioned
Embodiment.
Claims (7)
1. a method that suppresses co-channel interference in the wireless telecommunication system is to be used for a wireless receiving system, it is characterized in that this method is may further comprise the steps:
Receiving step frequently together, be to receive plural set specific frequency signal, these set specific frequency signals are to include a main signal and an at least one interference signal, this main signal is sent by a wireless transmitting system, and include at least one preamble, and this at least one preamble of this main signal be with this at least one interference signal be orthogonal;
One power level calculation procedure is the power level that calculates these set specific frequency signals according to the preamble of these set specific frequency signals respectively;
One power level comparison step is in order to compare the power level of these set specific frequency signals; And
One filtration step is to select to be higher than a preset value person as this main signal in the power level of these set specific frequency signals, and filters this at least one interference signal.
2. the method for co-channel interference in the inhibition wireless telecommunication system as claimed in claim 1 is characterized in that it also comprises:
One computer azimuth information step is an azimuth information that goes out this wireless transmitting system according to this main calculated signals; And
One back coupling information step is to send an echo message, and wherein this echo message is to comprise this azimuth information.
3. the method for co-channel interference in the inhibition wireless telecommunication system as claimed in claim 2, it is characterized in that, it comprises that also one strengthens signals step, be when this wireless transmitting system receives this echo message, strengthen azimuthal this main signal emissive porwer of past this wireless receiving system according to this azimuth information.
4. the method for co-channel interference in the inhibition wireless telecommunication system as claimed in claim 3, it is characterized in that, it also comprises a notice interference source step, be this azimuth information to be sent at least one interference source by this wireless transmitting system, wherein, this at least one interference source is to send this at least one interference signal, and this at least one interference source is azimuthal this at least one interference signal emissive porwer that weakens past this wireless receiving system according to this azimuth information.
5. the method for co-channel interference in the inhibition wireless telecommunication system as claimed in claim 2, it is characterized in that, it also comprises and weakens the interference step, be when at least one interference source that sends this at least one interference signal receives this this echo message, weaken azimuthal this interference signal emissive porwer of past this wireless receiving system according to this azimuth information.
6. a method that suppresses co-channel interference in the wireless telecommunication system is to be used for a wireless transmitting system, it is characterized in that this method is may further comprise the steps:
The main signals step of one emission is emission one main signal to a wireless receiving system, and this main signal is to include at least one preamble, and uses a characteristic frequency;
One receives the echo message step, is to receive by the echo message that this wireless receiving system sent, and this echo message is to include an azimuth information, and it is to be the result of this wireless receiving system according to this main calculated signals; And
One strengthens signals step, is azimuthal this main signal emissive porwer of strengthening past this wireless receiving system according to this azimuth information.
7. the method for co-channel interference in the inhibition wireless telecommunication system as claimed in claim 6, it is characterized in that, wherein, also include a notice interference source step after this reception echo message step, be that this azimuth information is sent at least one interference source, this at least one interference source is to send at least one interference signal, and this at least one interference source is azimuthal this at least one interference signal emissive porwer that weakens past this wireless receiving system according to this azimuth information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510091503 CN1917378A (en) | 2005-08-18 | 2005-08-18 | Method for restraining same frequency interference in wireless communication system |
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| CN 200510091503 CN1917378A (en) | 2005-08-18 | 2005-08-18 | Method for restraining same frequency interference in wireless communication system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217801B (en) * | 2008-01-08 | 2011-12-21 | 北京天碁科技有限公司 | A same frequency interference selection method applied in N frequency point networking system |
| CN101286786B (en) * | 2007-04-11 | 2013-03-20 | 中兴通讯股份有限公司 | Method for inhibiting interference during identical networking by scheduling |
| CN111405651A (en) * | 2020-03-27 | 2020-07-10 | 北京小米移动软件有限公司 | Method, device and medium for dynamically adjusting transmitting power |
| WO2021087759A1 (en) * | 2019-11-05 | 2021-05-14 | 深圳市大疆创新科技有限公司 | Co-frequency interference suppression method, linear frequency modulation continuous wave radar, mobile platform, and storage medium |
-
2005
- 2005-08-18 CN CN 200510091503 patent/CN1917378A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101286786B (en) * | 2007-04-11 | 2013-03-20 | 中兴通讯股份有限公司 | Method for inhibiting interference during identical networking by scheduling |
| CN101217801B (en) * | 2008-01-08 | 2011-12-21 | 北京天碁科技有限公司 | A same frequency interference selection method applied in N frequency point networking system |
| WO2021087759A1 (en) * | 2019-11-05 | 2021-05-14 | 深圳市大疆创新科技有限公司 | Co-frequency interference suppression method, linear frequency modulation continuous wave radar, mobile platform, and storage medium |
| CN111405651A (en) * | 2020-03-27 | 2020-07-10 | 北京小米移动软件有限公司 | Method, device and medium for dynamically adjusting transmitting power |
| CN111405651B (en) * | 2020-03-27 | 2023-12-26 | 北京小米移动软件有限公司 | Method, device and medium for dynamically adjusting transmitting power |
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