CN100589334C - Co-channel adjacent cell channel estimating method at the time of multi-cell union detection in TD SCDMA system - Google Patents
Co-channel adjacent cell channel estimating method at the time of multi-cell union detection in TD SCDMA system Download PDFInfo
- Publication number
- CN100589334C CN100589334C CN200710089289A CN200710089289A CN100589334C CN 100589334 C CN100589334 C CN 100589334C CN 200710089289 A CN200710089289 A CN 200710089289A CN 200710089289 A CN200710089289 A CN 200710089289A CN 100589334 C CN100589334 C CN 100589334C
- Authority
- CN
- China
- Prior art keywords
- tap
- window
- channel estimating
- exit window
- data division
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
A method for estimating the same frequency-adjacent cell channel of multiple cell united detection in TD-SCDMA system includes obtaining estimations of channel in local cell and channel in adjacent cell for obtaining an initial variable of local cell and for confirming a tap of adjacent cell, confirming position of one tap over said threshold in adjacent cell from taps at its existed window and position of code wheel in said window, judging whether there is data contribution corresponding to window position in initial variable or not and confirming whether said tap is out off window or not based on said judgment result.
Description
Technical field
The present invention relates to a kind ofly when in the TD-SCDMA base station, using the multi-plot joint detection algorithm, the signal of co-frequency neighbor cell portable terminal emission is carried out the method for channel estimating.Use the TD-SCDMA portable terminal of multi-plot joint detection algorithm also can use this method that transmitting of co-frequency neighbor cell base station carried out channel estimating, so that these interference signals are suppressed.
Background technology
The TD-SCDMA system uses the midamble sign indicating number to carry out channel estimating.Each sub-district is determined a basic midamble sign indicating number.Homogeneous frequency adjacent area has different basic midamble sign indicating numbers.Each portable terminal in the same sub-district under mode of operation is by the different up midamble sign indicating number of system assignment.These up midamble sign indicating numbers are the cyclic shifts by the basic midamble sign indicating number of this sub-district.The K value of system is 8 o'clock, and a unit length of translation is 16 chips.Below we all to equal 8 with system's K value be example.
The detection window of channel estimating is 128 chips, is divided into 8 windows, and each window length is 16 chips.The basic midamble sign indicating number translation that different windows is corresponding different.Corresponding relation as shown in Figure 1.
Shown among Fig. 1 that K equals 8 o'clock channel estimating detection window, wherein j window is corresponding to j midamble sign indicating number. and (1＜=j＜=8)
We claim with k the adjacent window of window be the adjacent window of k window, and the 8th window and the 1st the adjacent each other window of window.
The user of this sub-district and the base station synchronization of this sub-district are good.TD-SCDMA system cell radius is little.Generally speaking, the portable terminal channel impulse response time delay of this sub-district is less than 16 chips.At this moment the tap of the channel impulse response of this cell mobile terminal all drops in this window of distributing to this portable terminal midamble correspondence.
If but the TD-SCDMA base station uses multi-plot joint to detect to suppress the interference of co-frequency neighbor cell, the base station also needs to estimate the channel impulse response of co-frequency neighbor cell portable terminal interference signal.The base station synchronization of the sub-district at the portable terminal of each co-frequency neighbor cell and their places, and not necessarily with the base station synchronization of this sub-district.The Channel Detection window at some tap places of the channel impulse response of co-frequency neighbor cell portable terminal may not be the Channel Detection window of the midamble sign indicating number correspondence of this portable terminal like this.Just these taps that is not judged to other portable terminal in the tap of the Channel Detection window of this portable terminal may be caused channel estimation error during channel estimating, reduce inhibition that co-frequency neighbor cell is disturbed and the demodulation performance of this cell mobile terminal.We claim that this misjudgment phenomenon is the exit window problem of channel impulse response.
The TD-SCDMA portable terminal also faces similar tap exit window problem when the signal of co-frequency neighbor cell base station is carried out channel estimating.
Summary of the invention
Purpose of the present invention, be solve to be the TD-SCDMA base station to the signal of co-frequency neighbor cell portable terminal emission carry out channel estimating the time, the tap of channel estimating is offset to the erroneous judgement problem that adjacent window causes.This is a channel impulse response exit window problem normal appearance and that need solution.And tap departs from more exit window problem, though exist in the reality, because it is such co-frequency neighbor cell distance is often far away from this sub-district, less to the interference of this sub-district.
The tap exit window problem that another object of the present invention is the TD-SCDMA portable terminal that solve to use the multi-plot joint detection algorithm to the signal of co-frequency neighbor cell base station may face when carrying out channel estimating.
The object of the invention to solve the technical problems realizes by the following technical solutions.Determine the method for co-frequency neighbor cell channel estimating tap exit window in a kind of TD-SCDMA system that proposes according to the present invention, comprising:
A. obtain the channel estimating of this sub-district and the channel estimating of described co-frequency neighbor cell;
B. utilize the channel estimating of described this sub-district, obtain an initializing variable;
C. determine tap above all described co-frequency neighbor cell channel estimating of a thresholding;
D. to a tap in the tap of the described described co-frequency neighbor cell channel estimating that surpasses thresholding, determine the position of window at its place and the position of the chip in this window;
E. judge the contribution that whether has in the data division corresponding in the described initializing variable with the corresponding data division of the window's position with described chip position;
F. according to the result of described judgement, determine whether exit window of a described tap.
In a specific embodiment of the present invention, described step e comprises:
The data division that described and described chip position is corresponding be described initializing variable midamble part, with the vector of 16 values compositions of the beginning of the corresponding data division of described chip position; And
The described data division corresponding with the window's position is the vector of forming with preceding 16 chips of the corresponding midamble sign indicating number of described the window's position.
In a specific embodiment of the present invention, described step F comprises:
The step e judged result is that "Yes" judges that then a described tap is not the exit window tap as described, and the step e judged result is that "No" judges that then a described tap is the exit window tap as described.
In one embodiment of the invention, said method of the present invention further comprises:
G. for an exit window tap of having judged, judge in the described data division corresponding adjacent data part before with described chip position, whether the contribution of the data of a m position in the described initializing variable is arranged, if "Yes" then be judged to be preceding exit window then is judged to be the back exit window as "No"; M=(sequence number of system K value-described the window's position) wherein.
In a specific embodiment of the present invention, the data division described adjacent data before that described and described chip position is corresponding partly is the vector that the value of 16 chips before the described chip position is formed; And the data of described m position are the vector that preceding 16 chips of m midamble sign indicating number are formed.
In one embodiment of the invention, said method of the present invention further comprises: deduct the contribution of the midamble sign indicating number in the pairing footpath of described exit window tap from initializaing variable.
By technique scheme, a kind of method of co-frequency neighbor cell channel estimating had following advantage and beneficial effect at least when multi-plot joint detected in the TD-SCDMA of the present invention system: it can solve main channel estimating exit window problem, raising is to the accuracy of co-frequency neighbor cell channel estimating, thereby can improve the TD-SCDMA base station or portable terminal carries out the performance that multi-plot joint detects.
Description of drawings
Fig. 1 is the channel estimating detection window.Wherein n window is corresponding to n midamble sign indicating number.
Fig. 2 is tap position and three kinds of possible midamble situations that receive of channel estimating.
Embodiment
We at first analyze the characteristics of the midamble of the adjacent cell mobile terminal emission when the exit window problem takes place.
Fig. 2 has shown the midamble sign indicating number in the uplink service time slot of the adjacent community user that this sub-district receives.It is asynchronous with this cell base station that this user transmits, and its tap exit window causes the base station erroneous judgement.
Can see that from Fig. 2 just to differ a window between No. two midamble sign indicating numbers of judging by accident in actual midamble sign indicating number that receives in this sub-district and base station long, i.e. 16 chips.
According to top analysis, we use interference eliminated to add that the principle of coherent detection invented a kind of new algorithm.A specific embodiment of this algorithm comprises:
Step S1. obtains initial this cell channel estimation H with the basic midamble sign indicating number of the part of the midamble among the acute data of number that receives a subframe and this sub-district;
Step S2. compares these taps and a predetermined thresholding, obtains this cell channel and estimates H ';
Step S3. does convolution algorithm with this cell channel estimation H ' and this sub-district midamble sign indicating number, obtains the signal M of first this sub-district midamble sign indicating number of estimating that receives;
Step S4. deducts the contribution of the signal M of this sub-district midamble sign indicating number of just estimating that receives with the data data of the subframe that receives among the step S1, and obtain initializing variable A, that is: A=data-M. (this be the vector subtraction, align by structure of time slot);
Step S5. carries out channel estimating to adjacent sub-district, and the power of all taps of crossing thresholding by their correspondences is sorted from big to small;
Step S6. makes j=0;
Step S7. establishes on its i chip in k window j tap.If k equals 1, we allow m equal 8, otherwise allow m equal k-1;
The contribution of the vector of whether forming by preceding 16 chips of k midamble sign indicating number in the vector that the midamble of step S8. test initialization variables A part is formed since 16 values of i position;
If the detection court verdict of the top step S8 of step S9. is a "Yes", then j tap is not the exit window tap, otherwise j tap is the exit window tap;
Step S10) if. j tap is the exit window tap, again further 16 chips (not comprising i position) before the i position of test initialization variables A if the vector of value composition the contribution of the vector whether formed by preceding 16 chips of m midamble sign indicating number. "Yes", then be preceding exit window, otherwise be the back exit window;
Step S11). the contribution of the midamble sign indicating number in the footpath of j tap correspondence among the initializing variable A is deducted. this is the subtraction of vector, align by structure of time slot;
Step S12). judge whether judgement has all been done in all taps, if "Yes" then algorithm finish. otherwise allow j=j+1, forward step S7 to).
Top scheme is to use the previous section of the midamble part that receives to carry out the exit window situation and detects, and similarly, we also can use the aft section of the midamble part that receives to carry out the exit window situation and detect.
Claims (5)
1. determine the method for co-frequency neighbor cell channel estimating tap exit window when multi-plot joint detects in the TD-SCDMA system, it is characterized in that may further comprise the steps:
A. obtain the channel estimating of this sub-district and the channel estimating of described co-frequency neighbor cell;
B. utilize the channel estimating of described this sub-district, obtain an initializing variable;
C. determine tap above all described co-frequency neighbor cell channel estimating of a thresholding;
D. to a tap in the tap of the described described co-frequency neighbor cell channel estimating that surpasses thresholding, determine the position of window at its place and the position of the chip in this window;
E. judge the contribution that whether has in the data division corresponding in the described initializing variable with the corresponding data division of the window's position, if judge that then a described tap is not an exit window, otherwise judge that a described tap is the exit window tap with described chip position;
F. according to the result of described judgement, determine whether exit window of a described tap.
2. the method for claim 1 is characterized in that wherein said step e comprises:
The data division that described and described chip position is corresponding be described initializing variable midamble part, with the vector of 16 values compositions of the beginning of the corresponding data division of described chip position; And
The described data division corresponding with the window's position is the vector of forming with preceding 16 chips of the corresponding midamble sign indicating number of described the window's position.
3. the method for claim 1 is characterized in that further comprising:
G. for an exit window tap of having judged, judge in the described data division corresponding adjacent data part before whether the contribution of the data of a m position in the described initializing variable is arranged with described chip position; If "Yes" then be judged to be preceding exit window then is judged to be the back exit window as "No"; M=(sequence number of system K value-described the window's position) wherein.
4. method as claimed in claim 3 is characterized in that wherein:
The data division described adjacent data before that described and described chip position is corresponding partly is the vector that the value of 16 chips before the described chip position is formed; And
The data of described m position are the vector that preceding 16 chips of m midamble sign indicating number are formed.
5. method as claimed in claim 4 is characterized in that further comprising:
From initializing variable, deduct the contribution of the midamble sign indicating number in the pairing footpath of described exit window tap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710089289A CN100589334C (en) | 2007-03-20 | 2007-03-20 | Co-channel adjacent cell channel estimating method at the time of multi-cell union detection in TD SCDMA system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710089289A CN100589334C (en) | 2007-03-20 | 2007-03-20 | Co-channel adjacent cell channel estimating method at the time of multi-cell union detection in TD SCDMA system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101022285A CN101022285A (en) | 2007-08-22 |
| CN100589334C true CN100589334C (en) | 2010-02-10 |
Family
ID=38709956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710089289A Expired - Fee Related CN100589334C (en) | 2007-03-20 | 2007-03-20 | Co-channel adjacent cell channel estimating method at the time of multi-cell union detection in TD SCDMA system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100589334C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100296489A1 (en) * | 2007-12-18 | 2010-11-25 | Zte Corporation | Method of Uplink Multi-Cell Joint Detection in a Time Division-Synchronous Code Division Multiple Access System |
| CN101640549B (en) * | 2008-07-29 | 2012-10-03 | 中兴通讯股份有限公司 | Method for detecting activation of terminal code channel of TD-SCDMA system |
| CN102123113B (en) * | 2010-01-11 | 2013-07-03 | 鼎桥通信技术有限公司 | Method for transmitting public channel signal in high-speed rail cell |
| CN103517289B (en) * | 2012-06-21 | 2016-08-17 | 大唐联诚信息***技术有限公司 | The method and apparatus determining window channel impulse response in TD-SCDMA system common frequency multi-cell |
| CN109150773A (en) * | 2018-07-26 | 2019-01-04 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Radio channel characteristic estimating system |
-
2007
- 2007-03-20 CN CN200710089289A patent/CN100589334C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101022285A (en) | 2007-08-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103220707B (en) | A kind of detection method of antenna port number in LTE system | |
| CN101316115B (en) | Detection method, equipment and system of pilot frequency sequence signal | |
| EP1210803B1 (en) | Determination of data rate, based on power spectral density estimates | |
| CN100589334C (en) | Co-channel adjacent cell channel estimating method at the time of multi-cell union detection in TD SCDMA system | |
| US7394873B2 (en) | Adaptive channel estimation for orthogonal frequency division multiplexing systems or the like | |
| CN104378316A (en) | Doppler frequency offset estimation method and device | |
| JP2003318779A (en) | Device and method for measuring sir | |
| CN101808350B (en) | Common-frequency cell determining method and device | |
| CN101604990A (en) | Frequency bias compensation method and device | |
| CN103428122A (en) | User equipment and method for radio link monitoring | |
| CN102347918B (en) | Fine frequency offset method of estimation and device | |
| CN202721698U (en) | Successive interference cancellation joint detection apparatus | |
| CN101459455B (en) | Channel estimation method, signal detection method and apparatus | |
| CN101072046A (en) | Multi-path selecting method and receiver | |
| CN102404044B (en) | Frame synchronization detecting method for uplink signals in digital wireless trunking communication system based on TDMA (Time Division Multiple Access) technology and frame synchronization detecting device | |
| CN102833190B (en) | Edge detection method and device for constant envelope same frequency interference | |
| CN104980184A (en) | Method and equipment for cell search of TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system | |
| CN1925470B (en) | Multi-path judging method for time-division duplex mobile communication system | |
| CN102347808A (en) | Method and device for eliminating known interference on wireless communication node | |
| CN101902250A (en) | Method and equipment for determining length of smooth window in channel estimation | |
| CN105848200B (en) | Upgoing energy measurement method and device in a kind of TD-SCDMA system | |
| CN105703850B (en) | Based on short-time Fourier transform according to chain signal edge detection method | |
| CN103888388B (en) | UHF RFID reader frequency offset estimation and frame synchronization method | |
| CN103947148B (en) | Discrete transmission detecting device and method | |
| CN103095610A (en) | Frequency offset estimation method and device and communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151118 Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong high tech Industrial Park, ZTE building Patentee after: ZTE Corporation Patentee after: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong high tech Industrial Park, ZTE building Patentee before: ZTE Corporation |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20170320 |