CN1992564A - Apparatus and method for interference suppression in a wireless communication system - Google Patents
Apparatus and method for interference suppression in a wireless communication system Download PDFInfo
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- CN1992564A CN1992564A CNA2005100974211A CN200510097421A CN1992564A CN 1992564 A CN1992564 A CN 1992564A CN A2005100974211 A CNA2005100974211 A CN A2005100974211A CN 200510097421 A CN200510097421 A CN 200510097421A CN 1992564 A CN1992564 A CN 1992564A
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- 238000004891 communication Methods 0.000 title claims abstract description 7
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- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
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Abstract
This invention provides an interference suppression equipment and method used in the wireless communication system, in which the said method includes the following steps: (1) the base station detects the uplink interference and the noise power; (2) based on the detection results, determine whether there is interference, and if interference and noise power over system tolerance threshold, there is interference; (3) if there is interference, the base station automatically adjusts its own receiving sensitivity; (4) by the closed-loop power control of the base station, adjust the terminal's transmission power. This invention can improve the system interference suppression capability, particularly more significant for the capacity upgrade and application environment expansion of the CDMA system whose system capacity is limited by itself interference restriction.
Description
Technical field
The present invention relates to a kind of Apparatus and method for that in wireless communication system, disturbs inhibition.
Background technology
Radio wave can be subjected to the electromagnetic interference of different electronics such as dissimilar radio transmitters or high pressure arc discharge, power equipment in the free space propagation.In the performance of disturbing the system that to have a strong impact under the more intense situation.
Therefore need in wireless communication system, suppress, to improve the interference rejection capability of system to interference.
Summary of the invention
Purpose of the present invention can realize by equipment that this equipment comprises following assembly:
An antenna for base station;
A power splitter that links to each other with antenna for base station;
A base band receiver/sender that links to each other with described power splitter;
The modulus that links to each other with sender with a described base band receiver/digital-to-analogue conversion interface;
One with fader that described modulus/the digital-to-analogue conversion interface links to each other;
A base station baseband processing unit that links to each other with described fader;
An extra receiver/sender links to each other with described power splitter;
An extra modulus/digital-to-analogue conversion interface links to each other with described extra receiver/sender;
Extra and the described extra fader that modulus/the digital-to-analogue conversion interface links to each other;
And an extra baseband processing unit, link to each other with described extra fader and base station baseband processing unit.
Utilize the said equipment to disturb when suppressing, may further comprise the steps:
(1) base station is detected uplink interference and noise power;
(2) judged whether to disturb existence according to testing result, interference and noise power surpass the tolerance thresholding of system, then think to exist and disturb;
(3) if there is interference, the base station is regulated the receiving sensitivity of self automatically;
(4) by the closed power control of base station, adjust the transmitting power of terminal, so just can improve the up signal to noise ratio of system.
Suppose that the transmitting power of disturbing is Pi, the transmitting power of terminal is Pu, wherein Pi is not controlled by system, but the power of Pu can be implemented control to it by the power control techniques of SCDMA, so Pu=Pb*a is arranged, wherein Pb is the reference power of terminal emission, and a is the power control factor of base station to terminal.The interference power that this moment, received the base station is: Pir=Pi*k1*G1, and wherein k1 is the interference power path loss, G1 is the base station receiving gain; The terminal power that receive the base station is: Pur=Pb*a*k2*G1, and wherein K2 is the terminal power path loss, G1 is the base station receiving gain.After the receiving sensitivity of base station descended, G1 reduced a doubly, so Pir can descend a doubly thereupon, but the uplink power control of SCDMA mechanism can be adjusted a, and Pur is remained unchanged, and has so just improved online user's up signal to noise ratio, and interference is suppressed.The base station signal interference ratio is: SIR=Pur/Pir=Pb*a*k2/Pi*K1, SNR have improved a doubly.
Use the present invention, can improve the interference rejection capability of system, especially the capacity of CDMA system that is subjected to the interference-limited of system self for power system capacity promotes and the expansion of applied environment has even more important meaning.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is the present device schematic diagram;
Fig. 2 is the disturbance restraining method flow chart of one embodiment of the present of invention;
Fig. 3 is the flow chart of adjustment base station sensitivity of the disturbance restraining method of one embodiment of the present of invention.
Embodiment
Fig. 1 shows the annexation between equipment of the present invention and the assembly.This equipment comprises:
An antenna for base station;
A power splitter that links to each other with antenna for base station;
A base band receiver that links to each other with described power splitter;
An analog-to-digital conversion interface that links to each other with sender with described base band receiver;
A fader G1 who links to each other with described analog-to-digital conversion interface;
A base station baseband processing unit that links to each other with described fader G1;
One the 9th sender links to each other with described power splitter;
A digital-to-analogue translation interface links to each other with described the 9th sender;
A fader G2 who links to each other with described digital-to-analogue conversion interface;
And one the 9th tape handling unit, link to each other with fader G2 and base station baseband processing unit.
Wherein our power loss that the A point is ordered to B is called CABLE_LOSS.
The method that the SCDMA system realize to disturb suppresses may further comprise the steps: Interference Detection, and the adding up of interference power, the calculating of CABLE_LOSS adjustment amount realizes the adjustment of system's receiving sensitivity and the adjustment of terminal transmit power by the calibration process of smart antenna.
1, Interference Detection
Specify a code channel m at the base station end, code channel m will not distribute to user's use in system's running.Be that code channel m is idle all the time, be specifically designed to Interference Detection.Interference Detection early stage is identical with the actual processing method that takies code channel to idle code channel processing method.The base station respectively is being offset about uplink synchronous point on common 2*n+1 the synchronous points of n chip (chip) idle code channel, carry out despreading respectively, ask the weights (Weight value) of every antenna, and it is synthetic to carry out array signal according to the weights of the every antenna that obtains, and obtains symbol (Symbol) power.
2, interference power adds up
Fig. 2 shows the flow chart that adds up of interference power.Because may there be bursty interference, in for a long time, just can occur once, this interference is very little to the influence of system, so there is no need this interference is suppressed, so need add up to interference power, the average effect in a period of time is disturbed in observation, if it is too high at the average interference power of this section in the time, the tolerance thresholding that has surpassed system, the interference average power is: Noise_power, the tolerance thresholding position of system to disturbing: Noise_therehold is if Noise_power＞Noise_therehold then need the receiving sensitivity of Adjustment System disturbs inhibition.
One of ordinary skill in the art will appreciate that, interference power is not averaged and also can realize purpose of the present invention.
3, the calculating of CABLE_LOSS adjustment amount
Fig. 3 shows the calculation procedure of CABLE_LOSS adjustment amount.The SCDMA system is by adjusting the receiving sensitivity that calibration that CABLE_LOSS carries out smart antenna array then comes Adjustment System.When the base station detects interference power greater than base station interference tolerance thresholding, make Delta=Noise_power-Noise_therehold, make CABLE_LOSS=CABLE_LOSS+Delta then.The 9th baseband processing unit is delivered to new CABLE_LOSS in the base station then.Start the calibration process of smart antenna then, adjust the base station receiving sensitivity.
4, antenna calibration
The calibration flow process of smart antenna please refer to the real-time automatic calibrating method of radio base station array channel in the SCDMA system and system (200410069343.X) by reducing the receiving sensitivity of system after the calibration about the calibration of smart antenna, disturbs this moment the power that arrives the base station to reduce.
5, the adjustment of terminal transmit power
The transmitting power of terminal is adjusted by the uplink closed loop system of SCDMA in the base station, makes the transmitting power of terminal still remain on original power level, and the up signal to noise ratio of system will get a promotion like this.The assurance system still can operate as normal under the strong jamming situation.The transmitting power of adjusting terminal by the uplink closed loop system belongs to prior art, does not repeat them here.
During concrete enforcement, the base station receives that the interference of system suppresses the order back and starts and disturb inhibit feature, finishes Interference Detection by the base station baseband processing unit, the interference power statistics that adds up, CABLE_LOSS adjustment amount computing function is issued the 9th baseband processing unit with new CABLE_LOSS then.
After the 9th baseband processing unit is received new CABLE_LOSS, begin to calibrate, fix in order to guarantee the power output that B is ordered, adjust the gain of G2, then the power output of ordering at A becomes big, but the actual power dissipation of ordering to B from the A point does not change, thus the base station receive accept calibrating signal and can become big, then can adjust the gain of G1, thereby reduce the sensitivity of accepting of base station.
To the inhibition of disturbing, improve the signal to noise ratio of calling user, after the receiving sensitivity of base station descends, base station receiving gain G1 reduces a doubly, therefore Pir can descend a doubly thereupon, but the uplink power control of SCDMA mechanism can be adjusted a, and Pur is remained unchanged, so just improved online user's up signal to noise ratio, interference has been suppressed.The base station signal interference ratio is: SIR=Pur/Pir=Pb*a*k2/Pi*K1, SNR have improved a doubly.
One of ordinary skill in the art will appreciate that method of the present invention is not limited to have the SCDMA system of smart antenna, but can be used for any wireless communication system that has calibration function.
Implementation procedure of the present invention is simple, and principle is clear.The interference rejection capability of raising system.Promote and the expansion of applied environment has even more important meaning for the capacity of the CDMA system of interference-limited (power system capacity is subjected to the interference-limited of system self).
Claims (7)
1. an equipment that disturbs inhibition in wireless communication system is characterized in that, comprises following assembly:
An antenna for base station;
A power splitter that links to each other with antenna for base station;
A base band receiver/sender that links to each other with described power splitter;
The modulus that links to each other with a described base band receiver/sender/digital-to-analogue conversion interface;
One with fader that described modulus/the digital-to-analogue conversion interface links to each other;
A base station baseband processing unit that links to each other with described fader;
An extra receiver/sender links to each other with described power splitter;
An extra modulus/digital-to-analogue conversion interface links to each other with described extra receiver/sender;
Extra and the described extra fader that modulus/the digital-to-analogue conversion interface links to each other;
And an extra baseband processing unit, link to each other with described extra fader and base station baseband processing unit.
2. one kind is utilized the described equipment of claim 1 to carry out disturbance restraining method, it is characterized in that, may further comprise the steps:
(1) base station is detected uplink interference and noise power;
(2) judged whether to disturb existence according to testing result, interference and noise power surpass the tolerance thresholding of system, then think to exist and disturb;
(3) if there is interference, the base station is regulated the receiving sensitivity of self automatically;
(4), adjust the transmitting power of terminal by the closed power control of base station.
3. method as claimed in claim 2, it is characterized in that, the described detection of step (1) specifically comprises: specify an idle code channel m who is specifically designed to Interference Detection at the base station end, the base station respectively is being offset about uplink synchronous point on common 2n+1 the synchronous points of n chip idle code channel m, carry out despreading respectively, ask the weights of every antenna, and it is synthetic to carry out array signal according to the weights of the every antenna that obtains, and obtains symbol power, i.e. uplink interference and noise power.
4. method as claimed in claim 2 is characterized in that, described step (2) also comprises a step of in a period of time uplink interference and noise power being averaged before.
5. method as claimed in claim 4 is characterized in that, interference and noise power described in the step (2) are the mean value in uplink interference and noise power a period of time.
6. method as claimed in claim 2 is characterized in that, step (3) also comprises the step of the calibration of carrying out smart antenna before.
7. as claim 5, one of 6 described methods, it is characterized in that, when the base station is regulated the receiving sensitivity of self automatically in the step (3), described extra modulus/digital-to-analogue conversion interface is adjusted into to antenna for base station power loss CABLE_LOSS, the difference of the tolerance thresholding of uplink interference and noise power and system and CABLE_LOSS sum, extra baseband processing unit is delivered to adjusted CABLE_LOSS in the base station then.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2005100974211A CN1992564A (en) | 2005-12-28 | 2005-12-28 | Apparatus and method for interference suppression in a wireless communication system |
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| CNA2005100974211A CN1992564A (en) | 2005-12-28 | 2005-12-28 | Apparatus and method for interference suppression in a wireless communication system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867423A (en) * | 2010-06-22 | 2010-10-20 | 中兴通讯股份有限公司 | Method and device for detecting spatial thermal noise at the location of base station antenna |
| CN102498742A (en) * | 2009-09-15 | 2012-06-13 | 高通股份有限公司 | Systems and methods for over the air load indicator for wireless scheduling |
| CN102550091A (en) * | 2009-10-01 | 2012-07-04 | 三星电子株式会社 | LTE-A system and uplink power control method thereof |
| CN102946632A (en) * | 2011-08-15 | 2013-02-27 | 中兴通讯股份有限公司 | Uplink power control method of multiple-antenna system, and user terminal |
| US8868091B2 (en) | 2010-01-18 | 2014-10-21 | Qualcomm Incorporated | Methods and apparatus for facilitating inter-cell interference coordination via over the air load indicator and relative narrowband transmit power |
| CN107801235A (en) * | 2016-09-02 | 2018-03-13 | 马维尔国际贸易有限公司 | Echo or interference in communication system eliminate power and save management system and method |
| CN113439476A (en) * | 2019-02-15 | 2021-09-24 | Lg 电子株式会社 | Method for transmitting uplink data through preconfigured uplink resource in wireless communication system and apparatus therefor |
-
2005
- 2005-12-28 CN CNA2005100974211A patent/CN1992564A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102498742A (en) * | 2009-09-15 | 2012-06-13 | 高通股份有限公司 | Systems and methods for over the air load indicator for wireless scheduling |
| CN102498742B (en) * | 2009-09-15 | 2015-12-16 | 高通股份有限公司 | For the system and method for the aerial load designator of wireless dispatching |
| CN102550091A (en) * | 2009-10-01 | 2012-07-04 | 三星电子株式会社 | LTE-A system and uplink power control method thereof |
| US8731596B2 (en) | 2009-10-01 | 2014-05-20 | Samsung Electronics Co., Ltd | LTE-A system and uplink power control method thereof |
| CN102550091B (en) * | 2009-10-01 | 2015-03-25 | 三星电子株式会社 | LTE-A system and uplink power control method thereof |
| US8868091B2 (en) | 2010-01-18 | 2014-10-21 | Qualcomm Incorporated | Methods and apparatus for facilitating inter-cell interference coordination via over the air load indicator and relative narrowband transmit power |
| CN101867423A (en) * | 2010-06-22 | 2010-10-20 | 中兴通讯股份有限公司 | Method and device for detecting spatial thermal noise at the location of base station antenna |
| CN101867423B (en) * | 2010-06-22 | 2014-04-09 | 中兴通讯股份有限公司 | Method and device for detecting spatial thermal noise at position of antenna |
| WO2011160399A1 (en) * | 2010-06-22 | 2011-12-29 | 中兴通讯股份有限公司 | Method and device for detecting spatial thermal noise at the position of base station antenna |
| CN102946632A (en) * | 2011-08-15 | 2013-02-27 | 中兴通讯股份有限公司 | Uplink power control method of multiple-antenna system, and user terminal |
| CN107801235A (en) * | 2016-09-02 | 2018-03-13 | 马维尔国际贸易有限公司 | Echo or interference in communication system eliminate power and save management system and method |
| CN107801235B (en) * | 2016-09-02 | 2022-03-18 | 马维尔亚洲私人有限公司 | Echo or interference cancellation power saving management system and method in a communication system |
| CN113439476A (en) * | 2019-02-15 | 2021-09-24 | Lg 电子株式会社 | Method for transmitting uplink data through preconfigured uplink resource in wireless communication system and apparatus therefor |
| CN113439476B (en) * | 2019-02-15 | 2024-02-06 | Lg 电子株式会社 | Method for transmitting uplink data through preconfigured uplink resources in wireless communication system and apparatus therefor |
| US11974237B2 (en) | 2019-02-15 | 2024-04-30 | Lg Electronics Inc. | Method for transmitting uplink data through preconfigured uplink resource in wireless communication system, and apparatus therefor |
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Open date: 20070704 |