CN1561599A - Blind transport format detection using soft decision monitoring - Google Patents
Blind transport format detection using soft decision monitoring Download PDFInfo
- Publication number
- CN1561599A CN1561599A CN 02819450 CN02819450A CN1561599A CN 1561599 A CN1561599 A CN 1561599A CN 02819450 CN02819450 CN 02819450 CN 02819450 A CN02819450 A CN 02819450A CN 1561599 A CN1561599 A CN 1561599A
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- China
- Prior art keywords
- change
- decision
- amplitude
- transformat
- data
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- 238000012544 monitoring process Methods 0.000 title claims description 16
- 238000001514 detection method Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 claims description 12
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 20
- ZIIRLFNUZROIBX-UHFFFAOYSA-N 2,3,5-trichlorobenzene-1,4-diol Chemical compound OC1=CC(Cl)=C(O)C(Cl)=C1Cl ZIIRLFNUZROIBX-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0046—Code rate detection or code type detection
-
- 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
Abstract
A device for receiving blind transport format data and estimating the transport format of the data including a soft decision power monitor and a power change detector. The power monitor monitors the magnitude of soft decisions in the data over time. The detector detects changes in the magnitude of the monitored soft decisions, the detected changes representing characteristics of the transport format or representing characteristics of the transport format.
Description
Technical field
The present invention relates to a kind of transformat of estimating transmission channel, i.e. the method and apparatus that stops of the initial sum of data.
Background technology
In mobile communication system, a plurality of transmission channels can be multiplexed on the single channel as you know.Yet, need a kind of method, be used in data by behind this single channel, it is relevant to distinguish in which data and a plurality of transmission channels which.In some cases, finish by send additional control information with these data, this additional control information indicates any data to belong in a plurality of transmission channels which.Such control information is called as transformat combination indication (TFCI), and wherein this transformat combination (TFC) is multiplexed data flow.For example, the single channel of multiplexed a plurality of transmission channels is divided into a plurality of frames of length-specific, and these frames are divided into a plurality of time cycles, each time cycle is relevant with one of described a plurality of transmission channels.Can send the part of this TCFI as this frame, it is relevant how frame to be divided in a plurality of time cycles and which time cycle and a plurality of transmission channels which with indication.
Yet, in some systems, do not send the TFCI control information.So, must discern transformat by different way.This will be called as blind (blind) transport format detection (BTFD).This need be in the fixed position or the cycle each transmission channel is multiplexed on the single channel.In addition, at least one in the transmission channel can have been added the Cyclic Redundancy Check word.
In this case, the known Viterbi traceback (Viterbi traceback) of following of making by CRC check.In order to discern this transformat, this comprises the tediously long analysis to whole channel.Such operation is not only consuming time, and needs sizable power consumption.
Summary of the invention
According to a first aspect of the invention, a kind of device that is used to receive the blind transport format data and estimates the transformat of these data has been proposed, this device comprises: soft decision magnitude/power monitor is used for monitoring along with the past of time the amplitude or the power of this data soft-decision; With power or magnitude change detector, be used to detect the change of the amplitude of monitoring soft-decision, the high probability that the position that changes is represented the characteristic of this transformat or represented the representing characteristic of this transformat that detects.Preferably, these blind transport format data comprise Cyclic Redundancy Check.
Should recognize that the present invention can cause transformat identification faster, and need not to make the Viterbi traceback that all are followed by CRC check.The CRC position of at first verification is represented in the position that power/amplitude changes.This also has the advantage that needs lower power consumption, thus extending battery life, or allow the use than the low capacity battery of equal battery life.
According to a second aspect of the invention, proposed a kind of method that is used to estimate the transformat of the blind transport format data that received, this method comprises: the amplitude (power) of monitoring soft-decision in these data along with the past of time; With the change of the amplitude that detects monitoring soft-decision, the high probability that the position that changes is represented the characteristic of this transformat or represented the representing characteristic of this transformat that detects.
Description of drawings
To describe the present invention by example with reference to the accompanying drawings, and the figure shows the single channel of a plurality of transmission channels multiplexed, this single channel is divided into the TrCH cycle, and along with associated soft-decision power level of the past of time.
Embodiment
In the description of above prior art, multiplexed with reference to a plurality of transmission channels on single channel.In Fig. 1, the single channel of the frame of the rectangular expression at top is multiplexed three transmission channels.This single channel is divided into three time cycles in time, and each time cycle is filled from the data of one of a plurality of transmission channels or be partially filled.In each frame, this cycle is identical size or duration.Starting point and terminal point at Fig. 1 define this cycle with bold vertical lines, thereby should begin at the Far Left of Fig. 1 the period 1, and finish before the second Cyclic Redundancy Check word just.Data in cycle needn't be filled up this cycle.For example, in this cycle very first time, data are filled the major part in this cycle, only stay about sixth in this cycle for empty at terminal point.At least one of transport channel data can have been added the Cyclic Redundancy Check word.The terminal point of this transmission channel of location recognition of this CRC word is because it is positioned at the terminal point of this channel data.In Fig. 1, have the CRC word from the data of this first transmission channel (TrCH 0) at the terminal point of these data, but before this time cycle terminal point.Therefore in this second transmission channel (TrCH 1), do not have data in the transmission channel, and the CRC word appears at the starting point of this time cycle.In the 3rd time cycle, this CRC word appears before terminal point.The CRC word and should the time cycle terminal point between time cycle in, do not send data.
Receive data with the form of soft-decision from transmission channel (TrCH0-2).The use of soft-decision represents that the probability of data bit is+1 or-1, rather than a plurality of 1 and a plurality of 0.For example, the signal of certain bits can be+0.82, represents this to be+1 high probability.Place value replacedly ,-0.71 has shown that this position is-1 high probability.At the reception period of real data rather than DTX, probability is high, thus with the power of these signal associations also be height, shown in the chart of Fig. 1 during the cycle that is expressed as " the deduction TF of TrCH 0 ".During the terminal point of second time cycle sent this second (CRC) word, level also was high.And during sending the data and CRC word related with the 3rd transmitting channel (TrCH2), level is high.Yet, during the rest period of this time, after the terminal point of each transmitting channel has sent the CRC word, but before next transmitting channel begins, send the DTX position with zero energy, and the reception of power level that then can be lower, as shown in Figure 1.By in detection power image duration, the final position of each transmission channel can be identified or be reduced at least.Identification power descends and needn't represent accurate transformat length, but will discern a plurality of possible positions of the terminal point of transformat length.Certainly, the starting point of known transmission form length always is because they are fixed.
Under the situation of high s/n ratio, enough oneself identification this accurate dimension and transformats, thereby this transformat combination of deducibility and need not this CRC word of verification.Under these circumstances, if the CRC word only is used to discern transformat combination, then can wholely from signal omit them, because the present invention is with oneself identification TFC.
Under the situation than low signal-to-noise ratio, because noise, the starting point of transformat and the exact position of terminal point will become difficult and detect.To detect than the saltus step of physical presence more power.This is no problem, because then will be for the existence of the terminal point in cycle or starting point and test each of these positions.This method is significantly dwindled the position of (narrow down) cycle starting point and terminal point, and causes being used to discerning the minimizing of highly significant of the workload of transformat.
Be not difficult to realize the detection of power saltus step.Measured, the monitoring of this power, and be fed in the edge detector.This edge detector one of can be in many ways work.Can detect power saltus step greater than a certain size, or when power is crossed the threshold value that presets, can arrange to be used to discern this threshold value during sending data normal power value and send the CRC word and should the cycle terminal point between time cycle during the normal power value of DTX soft-decision between where.
Can utilize effective algorithm to carry out such rim detection, a plurality of edges exist.
By discerning transformat immediately from the power saltus step, if or the data of using channel-decoding to encode to be used for error checking purposes, then most probable position by discerning this cycle terminal point or that CRC word of at first verification carried out priority arrangement and that transformat that will decode is carried out priority arrangement, utilize the present invention, the speed that blind transport format detection takes place significantly increases.
The present invention is applied to depend on any system of blind transport format detection, and wherein multiplexed data are positioned at the fixed position cycle, for example in 3G UMTS standard or the GSM standard, thus the data that correctly demultiplexing received.
Claims (14)
1. device that is used to receive the blind transport format data and estimates the transformat of these data, this device comprises:
The soft-decision power monitor is used for monitoring along with the past of time the amplitude of this data soft-decision; With
Power change detector is used to detect the change of the amplitude of monitoring soft-decision, and the change that is detected is represented the characteristic of this transformat or represented the high probability of the representing characteristic of transformat.
2. device according to claim 1 is wherein arranged this detector reducing with the amplitude that detects monitoring soft-decision.
3. device according to claim 1 and 2, wherein this detector is an edge detector, arranges to be used to detect the change greater than the amplitude of the monitoring soft-decision of scheduled volume.
4. device according to claim 1 and 2, wherein this detector is a threshold dector, is used for detecting when it crosses predetermined power threshold the change of the amplitude of monitoring soft-decision.
5. according to the described device of aforementioned arbitrary claim, wherein these blind transport format data comprise Cyclic Redundancy Check.
6. device according to claim 5 also comprises the CRC check device, and whether the data that are used for any point of verification are correct CRC.
7. according to the described device of aforementioned arbitrary claim, also comprise prioritising element, be used for according to the likelihood of the representing characteristic of this transformat and each that change of detect is carried out priority arrangement.
8. method that is used to estimate the transformat of blind transport format data that receives comprises:
Monitored the amplitude (power) of soft-decision in these data along with the past of time; With
Detect the change of the amplitude of monitoring soft-decision, the change that is detected is represented the characteristic of this transformat or is represented the high probability of the representing characteristic of this transformat.
9. method according to claim 8 also comprises step: estimate this transformat by the change that is detected.
10. according to Claim 8 or 9 described methods, the change that wherein detects the amplitude of monitoring soft-decision is the detection that this amplitude is reduced.
11. according to Claim 8 to any described method of 10, the change that wherein detects the amplitude of monitoring soft-decision is to the detection greater than the edge of preliminary dimension.
12. to any described method of 10, the change that wherein detects the amplitude of monitoring soft-decision is the detection to the change of crossing predetermined power threshold according to Claim 8.
13., also comprise the data of verification arbitrfary point, whether be the Cyclic Redundancy Check word to discern these data according to Claim 8 to any described method of 12.
14., also comprise according to the likelihood of the representing characteristic of this transformat and each that change of detect carried out priority arrangement according to Claim 8 to any described method of 13.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0124238.7 | 2001-10-09 | ||
| GB0124238A GB2380909A (en) | 2001-10-09 | 2001-10-09 | Blind transport format detection via signal power changes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1561599A true CN1561599A (en) | 2005-01-05 |
Family
ID=9923507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02819450 Pending CN1561599A (en) | 2001-10-09 | 2002-10-09 | Blind transport format detection using soft decision monitoring |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1435147A1 (en) |
| CN (1) | CN1561599A (en) |
| GB (1) | GB2380909A (en) |
| WO (1) | WO2003032559A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106576018A (en) * | 2014-07-28 | 2017-04-19 | 高通股份有限公司 | Cyclic redundancy check (CRC) false detection reduction in communication systems |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366034C (en) * | 2004-11-03 | 2008-01-30 | 东南大学 | Blind transmission format detecting method suitable for broad band CDMA system |
| US8121104B2 (en) | 2006-05-31 | 2012-02-21 | Agere Systems Inc. | Method and apparatus for blind transport format detection using discontinuous transmission (DTX) detection |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1497678A (en) * | 1975-02-21 | 1978-01-12 | Int Computers Ltd | Data processing systems |
| JPS59221047A (en) * | 1983-05-30 | 1984-12-12 | Victor Co Of Japan Ltd | Synchronizing signal detecting circuit for digital signal transmission |
| JPH0622359B2 (en) * | 1987-12-14 | 1994-03-23 | 富士通株式会社 | Frame synchronization method |
| JPH0626343B2 (en) * | 1988-12-16 | 1994-04-06 | 日本電気株式会社 | Modulator / demodulator data transmission rate automatic switching system |
| EP0569688A1 (en) * | 1992-04-29 | 1993-11-18 | Hagenuk Telecom GmbH | Method and apparatus for fading compensation for TDMA-receivers |
| CA2214743C (en) * | 1996-09-20 | 2002-03-05 | Ntt Mobile Communications Network Inc. | A frame synchronization circuit and communications system |
| GB9908863D0 (en) * | 1999-04-20 | 1999-06-16 | Nds Ltd | Multiplexer |
-
2001
- 2001-10-09 GB GB0124238A patent/GB2380909A/en not_active Withdrawn
-
2002
- 2002-10-09 WO PCT/GB2002/004557 patent/WO2003032559A1/en not_active Application Discontinuation
- 2002-10-09 EP EP02765105A patent/EP1435147A1/en not_active Withdrawn
- 2002-10-09 CN CN 02819450 patent/CN1561599A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106576018A (en) * | 2014-07-28 | 2017-04-19 | 高通股份有限公司 | Cyclic redundancy check (CRC) false detection reduction in communication systems |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1435147A1 (en) | 2004-07-07 |
| WO2003032559A1 (en) | 2003-04-17 |
| GB2380909A (en) | 2003-04-16 |
| GB0124238D0 (en) | 2001-11-28 |
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |