CN102255833B - A kind of analytical method of uplink wideband interference and device - Google Patents
A kind of analytical method of uplink wideband interference and device Download PDFInfo
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- CN102255833B CN102255833B CN201010179899.XA CN201010179899A CN102255833B CN 102255833 B CN102255833 B CN 102255833B CN 201010179899 A CN201010179899 A CN 201010179899A CN 102255833 B CN102255833 B CN 102255833B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/26—Monitoring; Testing of receivers using historical data, averaging values or statistics
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Abstract
The invention discloses the analytical method of a kind of uplink wideband interference, comprising: the subframe determining the up link of carrying out broad-band interference analysis; Add up the noise power of each subcarrier that each empty slot takies in each subframe, and calculate the average noise power of subcarrier; Make an uproar value in the end of average noise power computing system according to subcarrier; The theoretical end of value of being made an uproar at the end of the system calculated and system value of making an uproar compares, and obtains the broad-band interference situation of system; The invention also discloses the analytical equipment of a kind of uplink wideband interference, by the present invention, when there being data service exist and do not stop data service, the broad-band interference of up link can be analyzed accurately.
Description
Technical field
The present invention relates to OFDM (OFDMA) system, refer to the analytical method that a kind of uplink wideband disturbs and device especially.
Background technology
OFDM (OFDMA, Orthogonal Frequency Division Multiple Access) communication system use bandwidth range to be the broadband signal of 1.5M ~ 20M.For broadband system, inevitably broad-band interference can be there is exactly.
The existence of uplink wideband interference, has had a strong impact on the transmission etc. of the normal business foundation of communication system, data.Wideband interferer signal exists in time domain, base station is when receiving data-signal, have received wideband interferer signal simultaneously, when doing fast Fourier transform (FFT), together with interference is just aliasing in the data of actual needs by frequency domain, cause correctly to obtain data when demodulation.But when there being data service to exist, frequency domain is difficult to again the data-signal distinguishing wideband interferer signal and actual needs.So, when communication system is run, how effectively to find and to identify that wideband interferer signal is most important.
In the existing technology of OFDMA system, analytical method for uplink wideband interference is stopped up business, at this moment the signal noise performance number that base station counts on is exactly value of making an uproar the end of system, has then judged whether that broad-band interference exists according to this end value of making an uproar.The drawback of this method will be removed all users exactly from base station, stops the data service of up link, and such to operate in actual application be forbidden.And how to have data service to deposit in case, the broad-band interference of up link is analyzed, never very well, method very accurately.
Summary of the invention
In view of this, the analytical method that main purpose of the present invention is to provide a kind of uplink wideband to disturb and device, when there being data service exist and do not stop data service, can analyze the broad-band interference of up link accurately.
In order to achieve the above object, technical scheme of the present invention is achieved in that
The invention provides the analytical method of a kind of uplink wideband interference, the method comprises:
Determine the subframe of the up link of carrying out broad-band interference analysis;
Add up the noise power of each subcarrier that each empty slot takies in described each subframe, and calculate the average noise power of subcarrier;
Make an uproar value in the end according to the average noise power computing system of described subcarrier;
The theoretical end of value and the system of being made an uproar at the end of the described system calculated value of making an uproar compares, and obtains the broad-band interference situation of system.
The method comprises further:
Last 3 symbols of described each subframe in time domain and 35 sub-channels on frequency domain are divided into the region (PUSC zone) of a parton channel; And all time slots (slot) comprised by described PUSC zone are set to sky slot, do not carry out the transmission of upstream data;
The noise power of each subcarrier that each empty slot in the described PUSC zone in described each subframe takies is added up.
Further, add up the noise power of described each subcarrier, be specially:
PowerSum＝I
2+Q
2；
Wherein, described PowerSum is the noise power of single sub-carrier; Described I is the real part of the frequency domain data from single sub-carrier reception; Described Q is the imaginary part of the frequency domain data from single sub-carrier reception.
Further, the average noise power of described calculating subcarrier, is specially:
Determine the number M of the subcarrier carrying out broad-band interference analysis according to the number of described subframe, according to the noise power of subcarrier and the number M of subcarrier, calculate the noise power that M subcarrier is total
wherein, described n is the sequence number of subcarrier, and M is natural number;
Then the average noise power of subcarrier is:
Further, making an uproar value in the end of described computing system, is specially:
Rssi＝10log(RssiEverySubCarrier×N)；
Wherein, described Rssi is value of making an uproar the end of system; The subcarrier number that the frequency domain symbol that described N is system comprises.
Further, value of being made an uproar at the end of the described system calculated, compares with value of making an uproar of the theoretical end of system, is specially:
The theoretical end of value of being made an uproar at the end of the system calculated and system value (RssiExp) of making an uproar carries out difference operation: RssiInterfere=Rssi-RssiExp;
Making an uproar the difference RssiInterfere of value in the make an uproar theoretical end of value and the system end according to described system, obtains the broad-band interference situation of system.
Further, obtain the broad-band interference situation of system, be specially: determine broad-band interference situation according to the Packet Error Ratio and described RssiInterfere that receive upstream data.
Present invention also offers the analytical equipment of a kind of uplink wideband interference, this device comprises:
Pretreatment module, for determining the subframe of the up link of carrying out broad-band interference analysis;
Statistical module, for adding up the noise power of each subcarrier that each empty slot takies in described each subframe, and calculates the average noise power of subcarrier; Also to make an uproar value for the end of the average noise power computing system according to described subcarrier;
Analysis module, for value of being made an uproar at the end of the described system calculated, compares with value of making an uproar of the theoretical end of system, obtains the broad-band interference situation of system.
Wherein, described pretreatment module, is further used for last 3 symbols of described each subframe in time domain and 35 sub-channels on frequency domain to be divided into a PUSC zone; And all slot that described PUSC zone comprises are set to sky slot;
Accordingly, described statistical module, is further used for adding up the noise power of each subcarrier that each empty slot in the described PUSC zone in described each subframe takies.
Described analysis module, the theoretical end of value and the system value of making an uproar that is further used for the end of the described system calculated to make an uproar carries out difference operation, and to make an uproar the difference of value according to receiving the make an uproar theoretical end of value and system of the Packet Error Ratio of upstream data and the end of described system, determine broad-band interference situation.
The present invention by arranging set, i.e. the PUSC zone of sky slot in the subframe of up link, concentrate and the noise power of each subcarrier that empty slot each in PUSC zone takies is added up, make an uproar value in the end that can obtain whole system, meanwhile, the slot in subframe except PUSC zone may be used to the transmission of upstream data; Then, to make an uproar the difference of value according to the make an uproar theoretical end of value and the system end of the system calculated, can the disturbed condition of certainty annuity middle width strip, so, the present invention when there being data service exist and do not stop data service, can analyze the broad-band interference of up link accurately.
Accompanying drawing explanation
Fig. 1 is the position view of the empty slot of the present invention in a subframe;
Fig. 2 is the analytical method schematic flow sheet of uplink wideband of the present invention interference;
Fig. 3 is the analytical equipment structural representation of uplink wideband of the present invention interference.
Embodiment
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
In OFDMA system, if uplink sub-carrier is not all used, then terminal only can send upstream data again on the subcarrier of specifying, and free time slot (slot) at this moment will be to exist.Slot is the least unit of data in OFDMA system, as shown in Figure 1, when up PUSC, a slot takies 3 symbols, on frequency domain, takies 1 sub-channels in time domain, one of them subchannel comprise 72 subcarriers (24 be pilot sub-carrier, 48 be data subcarrier).
Although do not send upstream data on empty slot, but the radio-frequency (RF) Receiving Device of network side is when receiving upstream data, these skies slot still has data to exist, these data are exactly the noise signal of surrounding environment, the power (referred to as noise power) of the present invention to the noise signal of each subcarrier that these skies slot takies is added up, just can obtain making an uproar at the bottom of the system of whole bandwidth value (Rssi), judge whether to there is broad-band interference with this.
Based on above-mentioned thought, technical scheme of the present invention is achieved in that as shown in Figure 2, comprises the steps:
Step 201, determines the subframe of the up link of carrying out broad-band interference analysis.
Suppose the analysis needing to carry out up continuous N=2,000,000 subcarrier broad-band interference in a measurement period, because upstream data is in units of subframe, and subframe takies 35 sub-channels on frequency domain, a channel comprises 72 subcarriers, namely a subframe takies 35 × 72=2520 subcarrier on frequency domain, then need to analyze about 2000000 ÷ 2502 ≈ 794 subframes; In OFDMA system, a subframe is 5ms, then an above-mentioned measurement period is approximately 794 × 5ms=4s.
In the application of reality, first can determine the number of sub-frames of adding up as required, then subcarrier number M=number of sub-frames × 2520.
In addition, the present invention repeatedly can also carry out the analysis of broad-band interference according to the above-mentioned measurement period determined.
Step 202, arranges PUSC zone based on each subframe.
In order to reduce the complexity of sub-carrier noise power statistics, the present invention arranges an empty slot set in the subframe of each statistics, the i.e. region (PUSC zone) of parton channel, as shown in Figure 1, a subframe takies 15 symbols in time domain, frequency domain takies 35 sub-channels, last 3 symbols of a subframe in time domain and 35 sub-channels are divided into PUSC zone, then this PUSC zone comprises 35 slot, each slot takies 72 subcarriers, in the present invention, these 35 slot are all set to sky slot, namely the PUSC zone setting a subframe does not send upstream data, but other slot can be used for the transmission of upstream data in this subframe.
Because PUSC zone does not send upstream data, then its 35 empty slot comprised just do not have corresponding modulation coding mode, and the value of so each empty slot corresponding modulating coded system is 0.
Step 203, adds up the noise power of each subcarrier that each empty slot takies.
As can be seen from Figure 1, an empty slot takies 72 subcarriers, and the noise power of the present invention to each subcarrier that each empty slot takies is added up.The statistics of this noise power is the frequency domain data based on each subcarrier, comprise real part (I) and imaginary part (Q) two parts data, wherein: when the radio-frequency (RF) Receiving Device of network side is from some subcarrier reception data of an empty slot, by the frequency domain data of acquisition 1 32bit, comprising the real part (I) of 16bit and the imaginary part (Q) of 16bit, imaginary part represents the phase place of this subcarrier, and the modulus value of real part and imaginary part represents the amplitude of this subcarrier).
So noise power PowerSum=I of this subcarrier
2+ Q
2.
Adopt the method to carry out repeating query to each empty slot in PUSC zone in each subframe needing to add up, an empty slot is needed to the noise power of statistics 72 subcarriers, need altogether the noise power counting M subcarrier.
Step 204, calculates the average noise power of subcarrier.
The noise power of the M a counted subcarrier is carried out add up, namely
wherein n is the sequence number of subcarrier, and M is natural number, and then divided by the number M of subcarrier, just can obtain the average noise power of subcarrier, the i.e. end of each subcarrier to make an uproar value:
Step 205, makes an uproar value in the end of computing system.
The sub-carrier number N that the average noise power of M subcarrier and frequency domain symbol in OFDMA system comprise is multiplied (when system bandwidth is 10M, N=1024; When bandwidth is 10M during 5M, N=512), make an uproar value: Rssi=10log (RssiEverySubCarrier × N) at the end that just can obtain system.
Step 206, the theoretical end of value of being made an uproar at the end of the system calculated and system value of making an uproar compares, and obtains the broad-band interference situation of system.
Carrying out difference operation, i.e. RssiInterfere=Rssi-RssiExp by adding up the end of system the obtained theoretical end of value and the system value RssiExp that makes an uproar that makes an uproar, being judged the broad-band interference situation of system by difference RssiInterfere.
General when not having broad-band interference, for OFDMA system, the theoretical end of the system obtained by emulation and the actual test value RssiExp that makes an uproar is at about-102dB.If there is broad-band interference to exist, then the end of system make an uproar value Rssi will be bigger than normal, exceed-102dB.
The present invention, according to receiving the Packet Error Ratio of upstream data and the value of RssiInterfere, obtains broad-band interference situation, carries out grade classification to bandwidth interference situation, such as, broad-band interference situation is divided into 8 grades:
1, when RssiInterfere≤10, think without broad-band interference, can not normal data traffic be affected;
2, when 10≤RssiInterfere≤20, think there is slight broad-band interference, may there is bag by mistake in transmitting uplink data, Packet Error Ratio can within 1%;
3, when 20 < RssiInterfere≤30, think that the broad-band interference having general degree, transmitting uplink data may exist less mistake bag, Packet Error Ratio can within 5%;
4, when 30 < RssiInterfere≤40, think there is moderate broad-band interference, may there is a small amount of mistake bag in transmitting uplink data, Packet Error Ratio can within 10%;
5, when 40 < RssiInterfere≤50, think there is serious broad-band interference; May be there is more mistake bag in transmitting uplink data, Packet Error Ratio can within 50%;
6, when 50 < RssiInterfere≤60, think there is more serious broad-band interference, may there is very many mistake bags in transmitting uplink data, Packet Error Ratio can within 70%;
7, when 60 < RssiInterfere≤70, think there is very serious broad-band interference, may there is a large amount of mistake bags in transmitting uplink data, Packet Error Ratio can within 90%;
8, as RssiInterfere > 70, at this moment the system noise power supersaturation received is described, exceeding can the performance boundary of demodulation, and think that upstream data substantially can not normal transmission, Packet Error Ratio reaches 100%.
Based on above-mentioned grade classification, the present invention can analyze accurately to the broad-band interference of up link.
The division of above-mentioned 8 grades is a kind of embodiment, certainly, according to the actual needs, can also carry out more accurate grade classification according to the reception Packet Error Ratio of upstream data and the value of RssiInterfere to the disturbed condition in broadband.
In order to realize above-mentioned analytical method, the invention provides the device that a kind of broad-band interference is analyzed, as shown in Figure 3, comprising:
Pretreatment module 10, for determining the subframe of the up link of carrying out broad-band interference analysis;
Statistical module 20, for adding up the noise power of each subcarrier that each empty slot takies in each subframe, and calculates the average noise power of subcarrier; Also for value of making an uproar according to the end of average noise power computing system of subcarrier;
Analysis module 30, for value of being made an uproar at the end of the system calculated, compares with value of making an uproar of the theoretical end of system, obtains the broad-band interference situation of system.
Wherein, pretreatment module 10, is further used for last 3 symbols of each subframe in time domain and 35 sub-channels on frequency domain to be divided into a PUSC zone; And all slot comprised by PUSC zone are set to sky slot, do not carry out the transmission of upstream data;
Accordingly, statistical module 20, is further used for adding up the noise power of each subcarrier that each empty slot in the PUSC zone in each subframe takies.
Analysis module 30, the theoretical end of be further used for the end of the system calculated to make an uproar value and system value of making an uproar carries out difference operation, and to make an uproar the difference of value according to receiving the make an uproar theoretical end of value and system of the Packet Error Ratio of upstream data and the end of system, determines broad-band interference situation.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (10)
1. an analytical method for uplink wideband interference, it is characterized in that, the method comprises:
Determine the subframe of the up link of carrying out broad-band interference analysis;
Add up the noise power of each subcarrier that each empty slot takies in described each subframe, and calculate the average noise power of subcarrier;
Make an uproar value in the end according to the average noise power computing system of described subcarrier;
The theoretical end of value and the system of being made an uproar at the end of the described system calculated value of making an uproar compares, and obtains the broad-band interference situation of system.
2. the analytical method of uplink wideband interference according to claim 1, it is characterized in that, the method comprises further:
Last 3 symbols of described each subframe in time domain and 35 sub-channels on frequency domain are divided into the region (PUSC zone) of a parton channel;
And all time slots (slot) comprised by described PUSC zone are set to sky slot, do not carry out the transmission of upstream data;
The noise power of each subcarrier that each empty slot in the described PUSC zone in described each subframe takies is added up.
3. the analytical method of uplink wideband interference according to claim 2, is characterized in that, add up the noise power of described each subcarrier, be specially:
PowerSum＝I
2+Q
2；
Wherein, described PowerSum is the noise power of single sub-carrier; Described I is the real part of the frequency domain data from single sub-carrier reception; Described Q is the imaginary part of the frequency domain data from single sub-carrier reception.
4. the analytical method of uplink wideband interference according to claim 3, it is characterized in that, the average noise power of described calculating subcarrier, is specially:
Determine the number M of the subcarrier carrying out broad-band interference analysis according to the number of described subframe, according to the noise power of subcarrier and the number M of subcarrier, calculate the noise power that M subcarrier is total
wherein, described n is the sequence number of subcarrier, and M is natural number;
Then the average noise power of subcarrier is:
5. the analytical method of uplink wideband interference according to claim 4, is characterized in that, making an uproar value in the end of described computing system, is specially:
Rssi＝10log(RssiEverySubCarrier×N)；
Wherein, described Rssi is value of making an uproar the end of system; The subcarrier number that the frequency domain symbol that described N is system comprises.
6. the analytical method of uplink wideband interference according to claim 5, is characterized in that, value of being made an uproar at the end of the described system calculated, and compares, be specially with value of making an uproar of the theoretical end of system:
The theoretical end of value of being made an uproar at the end of the system calculated and system value (RssiExp) of making an uproar carries out difference operation: RssiInterfere=Rssi-RssiExp;
Making an uproar the difference RssiInterfere of value in the make an uproar theoretical end of value and the system end according to described system, obtains the broad-band interference situation of system.
7. the analytical method of uplink wideband interference according to claim 6, is characterized in that, obtain the broad-band interference situation of system, be specially: determine broad-band interference situation according to the Packet Error Ratio and described RssiInterfere that receive upstream data.
8. an analytical equipment for uplink wideband interference, it is characterized in that, this device comprises:
Pretreatment module, for determining the subframe of the up link of carrying out broad-band interference analysis;
Statistical module, for adding up the noise power of each subcarrier that each empty slot takies in described each subframe, and calculates the average noise power of subcarrier; Also to make an uproar value for the end of the average noise power computing system according to described subcarrier;
Analysis module, for value of being made an uproar at the end of the described system calculated, compares with value of making an uproar of the theoretical end of system, obtains the broad-band interference situation of system.
9. the analytical equipment of uplink wideband interference according to claim 8, it is characterized in that, described pretreatment module, is further used for last 3 symbols of described each subframe in time domain and 35 sub-channels on frequency domain to be divided into a PUSC zone; And all slot that described PUSC zone comprises are set to sky slot;
Accordingly, described statistical module, is further used for adding up the noise power of each subcarrier that each empty slot in the described PUSC zone in described each subframe takies.
10. the analytical equipment of uplink wideband interference according to claim 8, it is characterized in that, described analysis module, the theoretical end of value and the system value of making an uproar that is further used for the end of the described system calculated to make an uproar carries out difference operation, and to make an uproar the difference of value according to receiving the make an uproar theoretical end of value and system of the Packet Error Ratio of upstream data and the end of described system, determine broad-band interference situation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010179899.XA CN102255833B (en) | 2010-05-20 | 2010-05-20 | A kind of analytical method of uplink wideband interference and device |
| PCT/CN2010/077686 WO2011143892A1 (en) | 2010-05-20 | 2010-10-12 | Method and device for analyzing uplink broadband interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010179899.XA CN102255833B (en) | 2010-05-20 | 2010-05-20 | A kind of analytical method of uplink wideband interference and device |
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| CN102255833B true CN102255833B (en) | 2015-08-12 |
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| WO (1) | WO2011143892A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102421123B (en) * | 2011-11-30 | 2014-07-30 | 合肥东芯通信股份有限公司 | Method and device for detecting neighbor cell bandwidth in LTE (Long Term Evolution) system |
| CN105519019B (en) * | 2013-05-27 | 2017-07-21 | 华为技术有限公司 | A kind of method and device for detecting interference signal |
| CN105517169B (en) * | 2014-09-26 | 2019-05-17 | 成都鼎桥通信技术有限公司 | It is a kind of for evading the dispatching method of interference |
| CN112543507B (en) * | 2019-09-23 | 2022-09-13 | 成都鼎桥通信技术有限公司 | Carrier selection method, device, base station and storage medium based on uplink interference |
| CN111447020B (en) * | 2020-06-05 | 2021-10-29 | 国网信息通信产业集团有限公司 | Interference processing method and system applied to power wireless private network |
| CN114189297B (en) * | 2021-11-23 | 2024-05-28 | 上海移为通信技术股份有限公司 | Wireless communication device and interference detection method thereof |
| CN114726410B (en) * | 2022-03-07 | 2022-09-30 | 山东大学 | Non-uniform wave beam space modulation method and system suitable for multi-antenna communication perception integration |
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| CN1462121A (en) * | 2002-05-31 | 2003-12-17 | 上海贝尔有限公司 | Device and method for estimating signal noise ratio of upper link in broad band CDMA mobile communication system |
| CN1650543A (en) * | 2002-03-26 | 2005-08-03 | 英特尔公司 | Method for selecting weight in multiple channel receiver |
| CN1885961A (en) * | 2005-06-23 | 2006-12-27 | 华为技术有限公司 | Uplink load controlling method |
| KR20090034552A (en) * | 2007-10-04 | 2009-04-08 | 삼성전자주식회사 | Apparatus and method for selecting candidate terminal of uplink interference control in broadband wireless communication system |
| US20090103446A1 (en) * | 2007-10-22 | 2009-04-23 | Samsung Electronics Co. Ltd. | Apparatus and method for estimating noise and interference on ranging channel in a broadband wireless communication system |
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2010
- 2010-05-20 CN CN201010179899.XA patent/CN102255833B/en not_active Expired - Fee Related
- 2010-10-12 WO PCT/CN2010/077686 patent/WO2011143892A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1650543A (en) * | 2002-03-26 | 2005-08-03 | 英特尔公司 | Method for selecting weight in multiple channel receiver |
| CN1462121A (en) * | 2002-05-31 | 2003-12-17 | 上海贝尔有限公司 | Device and method for estimating signal noise ratio of upper link in broad band CDMA mobile communication system |
| CN1885961A (en) * | 2005-06-23 | 2006-12-27 | 华为技术有限公司 | Uplink load controlling method |
| KR20090034552A (en) * | 2007-10-04 | 2009-04-08 | 삼성전자주식회사 | Apparatus and method for selecting candidate terminal of uplink interference control in broadband wireless communication system |
| US20090103446A1 (en) * | 2007-10-22 | 2009-04-23 | Samsung Electronics Co. Ltd. | Apparatus and method for estimating noise and interference on ranging channel in a broadband wireless communication system |
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| CN102255833A (en) | 2011-11-23 |
| WO2011143892A1 (en) | 2011-11-24 |
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