WO2007069077B1 - A method, an apparatus or a computer program for estimating a signal to noise ratio - Google Patents
A method, an apparatus or a computer program for estimating a signal to noise ratioInfo
- Publication number
- WO2007069077B1 WO2007069077B1 PCT/IB2006/003961 IB2006003961W WO2007069077B1 WO 2007069077 B1 WO2007069077 B1 WO 2007069077B1 IB 2006003961 W IB2006003961 W IB 2006003961W WO 2007069077 B1 WO2007069077 B1 WO 2007069077B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- time
- estimate
- estimating
- computer program
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/08—Closed loop power control
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Noise Elimination (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
A method of estimating a signal to interference ration (SIR) comprising: estimating the signal power of a signal received at a first time estimating the interference power of a signal received at a second time preceding the first time; and combining the signal power estimate at the first time and the interference power estimate at the second time to produce an estimate of the signal to interference ratio at the first time.
Claims
AMENDED CLAIMS (received by the International Bureau on 12 December 2007 (12.12.2007)
1. A method comprising: receiving from a wireless channel at a first time a first signal; equalising the received first signal using a channel estimate for the wireless channel at a third time, preceding the first time; estimating signal power using the equalised first signal; estimating interference power; and combining the signal power estimate and the interference power estimate to produce an estimate of the signal to interference ratio.
2. A method as claimed in claim 1 , wherein the channel estimate used for equalising the first signal is the most recently available channel estimate.
3. A method as claimed in claim 1 or 2, wherein the first signal is a pilot signal.
4. A method as claimed in any one of claims 1 to 3, wherein the first signal comprises pilot symbols of a DPCCH.
5. A method as claimed in any one of claims 1 to 4, wherein the first signal is a subset of a data slot or frame.
6. A method as claimed in any preceding claim, wherein estimating the interference power comprises: receiving from the wireless channel at a second time that precedes the first time, a second signal; equalising the second signal using an estimate for the wireless channel at the second time; and estimating interference power using the equalised second signal.
7. A method as claimed in claim 6, wherein the equalised second signal is used for data acquisition.
18
8. A method as claimed in any one of claims 1 to 5, wherein estimating the interference power comprises: receiving from the wireless channel a second signal; equalising the second signal using an estimate for the wireless channel at a second time preceding the first time; and estimating interference power using the equalised second signal.
9. A method as claimed in claim 6, 7 or 8, wherein the third time is the same as the second time.
10. A method as claimed in claim 6, 7 or 8, wherein the second time precedes the third time.
11. A method as claimed in any one of claims 8 to 10, wherein the second signal is a pilot signal.
12. A method as claimed in any one of claims 8 to 10, wherein the second signal is a common pilot signal.
13. A method as claimed in any preceding claim, wherein the signals are received via a wireless channel and the wireless channel is a physical downlink channel in a cellular radio telecommunications system.
14. A method as claimed in claim 13, wherein the wireless channel is a physical downlink channel for WCDMA.
15. A method as claimed in any preceding claim, wherein the first time is substantially contemporaneous with a current time.
16. An apparatus comprising: receiver circuitry arranged to receive from a wireless channel at a first time a first signal; an equaliser arranged, when solved using a channel estimate for the wireless channel at a third time, preceding the first time, to equalise the received first signal;
19
25. An apparatus as claimed in any one of claims 20 to 24, wherein the second signal is a pilot signal.
26. An apparatus as claimed in any one of claims 20 to 25, wherein the second signal is a common pilot signal.
27. A mobile telephone incorporating the apparatus as claimed in any one of claims 16 to 26.
28. A computer program comprising computer program instructions for: controlling the solution of an equaliser for a channel estimate at a third time; controlling the equalisation of a received first signal, received after the third time, by the equaliser when solved for a channel estimate at a third time, to produce an equalised first signal estimating the signal power using the equalised first signal; estimating the interference power; and combining the signal power estimate and the interference power estimate to produce an estimate of the signal to interference ratio.
29. A computer program as claimed in claim 28, further comprising controlling the equalisation of a second signal, received on or after the third time, by the equaliser when solved for a channel estimate at the third time, to produce an equalised second signal wherein estimating the interference power uses the equalised second signal.
30. A computer program comprising computer program instructions for performing the method of any one of claims 1 to 15.
31. A computer program product embodying the computer program of claim 29 or 30.
32. A method comprising: estimating the signal power of a signal received at a first time; estimating the interference power of a signal received at a second time preceding the first time; and
20
combining the signal power estimate at the first time and the interference power estimate at the second time to produce an estimate of the signal to interference ratio at the first time.
49. A computer program comprising computer program instructions for performing the method of any one of claims 32 to 46.
50. A computer program product embodying the computer program of claim 48 or 49.
51. A method comprising: receiving from a wireless channel at a first time a first signal; equalising the received first signal using a channel estimate for the wireless channel at a second time, preceding the first time; and determining a signal power estimate using the equalised first signal.
52. An apparatus as claimed in any one of claims 16 to 26 and 47, embodied as a chip, chipset, module or device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06848629A EP1941625A2 (en) | 2005-10-28 | 2006-10-27 | A method, an apparatus or a computer program for estimating a signal to noise ratio |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0521983A GB2431825A (en) | 2005-10-28 | 2005-10-28 | Estimating signal to interference ratio in a mobile communications system |
| GB0521983.7 | 2005-10-28 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO2007069077A2 WO2007069077A2 (en) | 2007-06-21 |
| WO2007069077A3 WO2007069077A3 (en) | 2008-01-03 |
| WO2007069077B1 true WO2007069077B1 (en) | 2008-02-28 |
Family
ID=35515881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2006/003961 Ceased WO2007069077A2 (en) | 2005-10-28 | 2006-10-27 | A method, an apparatus or a computer program for estimating a signal to noise ratio |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1941625A2 (en) |
| CN (1) | CN101297496A (en) |
| GB (1) | GB2431825A (en) |
| WO (1) | WO2007069077A2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4924201B2 (en) * | 2007-05-23 | 2012-04-25 | 日本電気株式会社 | Reception quality measuring apparatus and reception quality measuring method |
| CN105828373B (en) * | 2015-01-06 | 2018-05-15 | 中国移动通信集团设计院有限公司 | A kind of method and device for the Signal to Interference plus Noise Ratio SINR for calculating down channel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7330446B2 (en) * | 2001-09-21 | 2008-02-12 | Industrial Technology Research Institute | Closed-loop power control method for a code-division multiple-access cellular system |
| JP4182344B2 (en) * | 2003-06-20 | 2008-11-19 | 日本電気株式会社 | SIR measuring apparatus and method |
| US20050135460A1 (en) * | 2003-12-22 | 2005-06-23 | Hidenori Akita | Method and apparatus for estimating a SIR of a pilot channel in a MC-CDMA system |
| US7251497B2 (en) * | 2003-12-31 | 2007-07-31 | Infineon Technologies Ag | Signal-to-interference ratio estimation for CDMA |
| US20050195886A1 (en) * | 2004-03-02 | 2005-09-08 | Nokia Corporation | CPICH processing for SINR estimation in W-CDMA system |
| KR100657827B1 (en) * | 2004-10-22 | 2006-12-14 | 삼성전자주식회사 | Signal to interference ratio measurement method using signal power attenuation ratio of pilot channel and signal to interference ratio measurement device using same |
-
2005
- 2005-10-28 GB GB0521983A patent/GB2431825A/en not_active Withdrawn
-
2006
- 2006-10-27 WO PCT/IB2006/003961 patent/WO2007069077A2/en not_active Ceased
- 2006-10-27 CN CN 200680039989 patent/CN101297496A/en active Pending
- 2006-10-27 EP EP06848629A patent/EP1941625A2/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP1941625A2 (en) | 2008-07-09 |
| GB0521983D0 (en) | 2005-12-07 |
| GB2431825A (en) | 2007-05-02 |
| WO2007069077A3 (en) | 2008-01-03 |
| WO2007069077A2 (en) | 2007-06-21 |
| CN101297496A (en) | 2008-10-29 |
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