WO2005013508A1 - Procede de detection de la puissance du parasitage dans un systeme amdc a creneau temporel - Google Patents
Procede de detection de la puissance du parasitage dans un systeme amdc a creneau temporel Download PDFInfo
- Publication number
- WO2005013508A1 WO2005013508A1 PCT/CN2004/000877 CN2004000877W WO2005013508A1 WO 2005013508 A1 WO2005013508 A1 WO 2005013508A1 CN 2004000877 W CN2004000877 W CN 2004000877W WO 2005013508 A1 WO2005013508 A1 WO 2005013508A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- interference power
- threshold
- signal
- estimation
- estimation result
- Prior art date
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Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
Definitions
- the present invention relates to the field of mobile communication technology, and is a method for measuring interference signal power in a time slot code division multiple access (CDMA) system.
- CDMA time slot code division multiple access
- the receiver uses the channel estimation code (middle code: midamble Code) and the response of the channel estimation window to the channel estimation code to measure the interference signal code power (ISCP: Interference Signal Code Power).
- the response result of the channel estimation window includes a tap with a signal response component and a tap without a signal response component.
- the tap without a signal response component represents a response to interference, and is called an interference response tap.
- the first method is a method for measuring interference power using an idle channel estimation window.
- each channel estimation code obtained by shifting a basic intermediate code (basic ic midamble code) corresponds to each channel estimation window one by one.
- the corresponding channel estimation window is called an idle channel estimation window.
- the idle channel estimation window corresponds to the response of the interference signal.
- the response of the idle channel estimation window can measure the interference power ⁇ consult 2 :
- W represents channel estimation window length of the window
- the first channel estimation result ⁇ obtains the total power of the k m th window (W taps power addition), and then obtains all idle channel estimation window total power (each idle Add the total power of the channel estimation window window) to indicate different idle windows (all k m not used), and then multiply by P and divide by D
- W and the number of all idle channel estimation windows (# of all k m not used ) Average, and the average value of all idle channel estimation windows and all taps is the interference power.
- the base station can know the exact position of the idle channel estimation window, so this method has its advantages for uplink interference power estimation;
- a special channel estimation window is specified in each time slot, and it is always in an idle state, or in a certain frame period position;
- the channel estimation window of the user may also be specified to be in an idle state within the determined frame.
- the above-mentioned methods for obtaining an idle channel estimation window in the downlink all bring certain resource waste, implementation complexity, and immediacy to the system. Judging from the current situation, the existing mobile communication standards cannot support the user terminal to obtain the idle channel estimation window information. Therefore, for the user terminal application, the method of the idle channel estimation window cannot be used to measure the interference power. .
- the second method is to use the signal-to-noise ratio threshold post-processing method for interference power measurement. Threshold processing is performed on the channel response estimation result according to the signal-to-noise ratio threshold, and the signal response and the interference response can be separated.
- the specific method for the post-processing of the signal-to-noise ratio threshold is: judge whether the signal-to-noise ratio of each tap in the original channel estimation result is higher than a specific threshold; if it is higher than the specific threshold, use the channel estimation value on the tap as the signal response; If it is below the specific threshold, the channel estimate at this tap is considered as the response of the interfering signal.
- the specific signal-to-noise ratio threshold s CHE when the interference power used as the threshold reference is ⁇ 2 , the corresponding power threshold is:
- the post-processing interference response is:
- the above formula indicates: reserved when the channel response is less than the interference power threshold, and other discarded (zero). It is assumed that after the post-processing, the number of taps of the interference signal response is W n , and the interference power can be calculated by the following formula: ⁇ réelle, ⁇
- D-W Consump ⁇ 1 ( 5) where D is the noise degradation factor corresponding to the basic intermediate code, which is still calculated using equation (2).
- This method performs better in the estimation of interference power, but the premise of its use is that it must be There is an interference power that is used as a threshold reference in advance, that is, ⁇ ⁇ in formula (3), and what is required by formula (5) is exactly this interference power ⁇ . In the absence of this prior value or the error of this prior value, When it is large, it does not make sense to estimate the interference power by this method. Therefore, when the interference power is actually measured, this method cannot be used alone, unless it is matched with the method of the idle channel estimation window, it can be used in some cases without the idle channel estimation window.
- the existing measurement methods of the interference signal code power are difficult to meet the requirements for downlink terminal receiving applications.
- the normal operation of the system requires the end user to be able to measure the interference signal code power of the downlink working time slot and the non-working time slot. Therefore, an effective method that can be used to measure the power of the interference signal code of the downlink user terminal must be given.
- the purpose of the present invention is to propose a method for measuring interference power of a time slot code division multiple access system, which can be applied to user terminal for measuring interference signal code power, including interference signal code power measurement for downlink working time slots and non-working time slots. .
- a method for measuring interference power of a time slot CDMA system includes:
- the signal-to-noise ratio threshold post-processing method is used to perform threshold processing on the original channel response estimation result to obtain an accurate measurement result of the interference power.
- the interference power measurement method of the present invention mainly includes two steps: first perform a rough estimation of the interference power, and then use the coarse estimation result of the interference power to obtain an accurate measurement result of the interference power. fruit. Since the taps are taken out according to a given number of taps threshold when performing rough estimation, when the signal-to-noise ratio threshold processing method is used for accurate estimation, the signals are processed according to the signal-to-noise ratio threshold and the obtained rough estimation of the interference power, and it is not necessary to know the free channel The position of the estimation window does not need to depend on the prior value of the interference power as a threshold reference. After two steps of processing, an accurate measurement value of the interference power can be obtained.
- the present invention When performing accurate measurement of interference power, the present invention also compensates for possible errors in rough estimation of interference power, obtains a compensated power threshold according to a set signal-to-noise ratio threshold, and then uses the power threshold to Threshold processing is performed on the channel estimation result to obtain the response of the interference signal, and the interference signal code power is estimated by using the response of the interference signal.
- the method proposed by the present invention can be used to measure interference power in a time slot code division multiple access mobile communication system. This method does not need to know the position of the idle channel estimation window and the prior value of the interference power as a threshold reference.
- the downlink of the slot code division multiple access mobile communication system can reliably measure the interference signal code power. Therefore, the method provided by the present invention is particularly applicable to the measurement of interference power in the downlink of the time slot CLA system.
- the method itself can also be used to measure the interference power of the uplink of the time slot CDMA system.
- FIG. 1 is a flowchart of a method for measuring a power of an interference code signal according to the present invention. Mode of Carrying Out the Invention
- the present invention proposes a method for measuring interference power of a time slot code division multiple access mobile communication system, especially for application to a user terminal in a time slot code division multiple access mobile communication system.
- the embodiment further explains the interference power measurement method for the specific application of the method of the present invention to a user terminal of a 3GPP TDD system.
- FIG. 1 a method for measuring an interference signal code power according to the present invention is shown, which reflects an implementation process from the rough estimation to the accurate estimation for completing the method of the present invention.
- Step 11 Use the channel estimation code to perform channel estimation on the input received signal, and obtain the channel response results of all users in the cell, that is, the estimation results of the original channel;
- Step 12 Process the original channel estimation result according to the set tap number gate value, and give a rough estimation result of the interference signal power.
- the specific processing is: from the result of the entire original channel estimation, take out the weaker taps according to the set tap threshold (the weaker power is ⁇ 1
- the taps can be selected from the weakest taps, such as the weakest, second weakest, total, or Wi taps with relatively weak power can be selected in other orders), and their channel estimation results are retained.
- the remaining taps are discarded.
- the threshold value of the number of taps Wi ' should be less than the number of interference response taps that can actually be obtained.
- the threshold value of the number of taps can also be preset according to the channel environment and system configuration.
- the tap number threshold ⁇ can range from 50 to 90. In this embodiment, the tap number threshold ⁇ is 80.
- the interference response result is used to obtain a rough estimation result of the interference power, which is expressed by the formula (7):
- Formula (7) is the same as formula (5), except that the number of taps W n is replaced by W and 2 is replaced by the formula.
- the period of the channel estimation code (total window length) P 128.
- Step 13 using the rough estimated value of the interference power and the set signal-to-noise ratio threshold value ⁇ :
- the original channel estimation result is processed according to the signal-to-noise ratio threshold 3 ⁇ 4 ⁇ , and an accurate measurement result of interference power is obtained.
- a signal-to-noise ratio threshold method is used, so the signal-to-noise ratio threshold C HE needs to be set, and a threshold reference value of interference power needs to be given. Because the interference power obtained by the rough estimation in the first step is often smaller than the actual interference power, and its error will vary with the environment and system working conditions.
- the rough estimated power is used as the reference value of the interference power after compensation, and then the signal-to-noise ratio threshold is processed according to a given signal-to-noise ratio threshold ⁇ to obtain an accurate measurement result of the interference power.
- the power threshold after compensation should be taken as:
- the interference response obtained after the signal-to-noise ratio threshold processing is:
- Formula (9) is the same as formula (4), and the channel response is kept smaller than the interference power threshold r c / ffi , and the others are discarded (zero). Only after the signal-to-noise ratio threshold processing, the number of taps corresponding to the interference response is W 2 , and the interference power can be calculated by the following formula: Formula (10) is the same as formula (5). In this way, after two steps of processing, we get an accurate measurement of the interference power.
- the interference power measurement method of the present invention is made for the application of a time slot code division multiple access mobile communication system, especially in a downlink receiving device.
- the method can perform multi-time slot code division without the idle channel estimation window information. Reliable and accurate measurement of interference power in mobile communication systems.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mobile Radio Communication Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Stereo-Broadcasting Methods (AREA)
- Noise Elimination (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04762015T ATE498956T1 (de) | 2003-08-05 | 2004-07-28 | Störleistungs-detektionsverfahren in einem zeitschlitz-cdma-system |
EP20040762015 EP1653633B1 (en) | 2003-08-05 | 2004-07-28 | A interference power detection method in time-slot cdma system |
JP2006515274A JP4269186B2 (ja) | 2003-08-05 | 2004-07-28 | タイムスロットcdmaシステムにおいて干渉パワーを測定する方法 |
US10/561,094 US7864833B2 (en) | 2003-08-05 | 2004-07-28 | Method for measuring interference power in time-slot CDMA system |
DE200460031431 DE602004031431D1 (de) | 2003-08-05 | 2004-07-28 | Störleistungs-detektionsverfahren in einem zeitschlitz-cdma-system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN03149766.7 | 2003-08-05 | ||
CNB031497667A CN100534014C (zh) | 2003-08-05 | 2003-08-05 | 时隙cdma系统干扰功率测量方法 |
Publications (1)
Publication Number | Publication Date |
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WO2005013508A1 true WO2005013508A1 (fr) | 2005-02-10 |
Family
ID=34109572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/CN2004/000877 WO2005013508A1 (fr) | 2003-08-05 | 2004-07-28 | Procede de detection de la puissance du parasitage dans un systeme amdc a creneau temporel |
Country Status (8)
Country | Link |
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US (1) | US7864833B2 (zh) |
EP (1) | EP1653633B1 (zh) |
JP (1) | JP4269186B2 (zh) |
KR (1) | KR100653413B1 (zh) |
CN (1) | CN100534014C (zh) |
AT (1) | ATE498956T1 (zh) |
DE (1) | DE602004031431D1 (zh) |
WO (1) | WO2005013508A1 (zh) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US7738848B2 (en) | 2003-01-14 | 2010-06-15 | Interdigital Technology Corporation | Received signal to noise indicator |
CN100423602C (zh) * | 2005-05-17 | 2008-10-01 | 上海原动力通信科技有限公司 | 应用于同频组网的波束赋形实现方法 |
FI20065699A0 (fi) * | 2006-11-06 | 2006-11-06 | Nokia Corp | HARQ-vastaanotto moniradiolaitteessa |
EP3203642B1 (en) * | 2011-04-05 | 2019-02-20 | BlackBerry Limited | Method of interference cancellation and method of detection of erroneous neighbour cell measurements |
CN114205197B (zh) * | 2022-02-15 | 2022-06-28 | 高拓讯达(北京)科技有限公司 | 一种信道估计平滑方法及装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10190522A (ja) * | 1996-12-25 | 1998-07-21 | N T T Ido Tsushinmo Kk | 直接拡散cdma伝送方式の受信機 |
DE19952949A1 (de) * | 1999-11-03 | 2001-05-10 | Siemens Ag | Verfahren zur Leistungs- und/oder Interferenz-Schätzung in einem TD/CDMA-basierten Funk-Kommunikationssystem |
US6477161B1 (en) * | 1998-12-21 | 2002-11-05 | Nortel Networks Limited | Downlink beamforming approach for frequency division duplex cellular systems |
US20030072277A1 (en) * | 2001-08-07 | 2003-04-17 | Parvathanathan Subrahmanya | Adaptive pilot filter for a wireless communication system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7372825B1 (en) * | 1999-07-13 | 2008-05-13 | Texas Instruments Incorporated | Wireless communications system with cycling of unique cell bit sequences in station communications |
US6816470B2 (en) * | 2001-09-18 | 2004-11-09 | Interdigital Technology Corporation | Method and apparatus for interference signal code power and noise variance estimation |
-
2003
- 2003-08-05 CN CNB031497667A patent/CN100534014C/zh not_active Expired - Lifetime
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2004
- 2004-07-28 US US10/561,094 patent/US7864833B2/en active Active
- 2004-07-28 KR KR1020057024648A patent/KR100653413B1/ko active IP Right Grant
- 2004-07-28 EP EP20040762015 patent/EP1653633B1/en active Active
- 2004-07-28 DE DE200460031431 patent/DE602004031431D1/de active Active
- 2004-07-28 AT AT04762015T patent/ATE498956T1/de not_active IP Right Cessation
- 2004-07-28 WO PCT/CN2004/000877 patent/WO2005013508A1/zh active IP Right Grant
- 2004-07-28 JP JP2006515274A patent/JP4269186B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10190522A (ja) * | 1996-12-25 | 1998-07-21 | N T T Ido Tsushinmo Kk | 直接拡散cdma伝送方式の受信機 |
US6477161B1 (en) * | 1998-12-21 | 2002-11-05 | Nortel Networks Limited | Downlink beamforming approach for frequency division duplex cellular systems |
DE19952949A1 (de) * | 1999-11-03 | 2001-05-10 | Siemens Ag | Verfahren zur Leistungs- und/oder Interferenz-Schätzung in einem TD/CDMA-basierten Funk-Kommunikationssystem |
US20030072277A1 (en) * | 2001-08-07 | 2003-04-17 | Parvathanathan Subrahmanya | Adaptive pilot filter for a wireless communication system |
Also Published As
Publication number | Publication date |
---|---|
ATE498956T1 (de) | 2011-03-15 |
CN1581752A (zh) | 2005-02-16 |
CN100534014C (zh) | 2009-08-26 |
EP1653633A1 (en) | 2006-05-03 |
EP1653633B1 (en) | 2011-02-16 |
JP4269186B2 (ja) | 2009-05-27 |
DE602004031431D1 (de) | 2011-03-31 |
US7864833B2 (en) | 2011-01-04 |
KR100653413B1 (ko) | 2006-12-04 |
JP2007507117A (ja) | 2007-03-22 |
KR20060054201A (ko) | 2006-05-22 |
EP1653633A4 (en) | 2009-01-14 |
US20070201538A1 (en) | 2007-08-30 |
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