CN103379500B - Co-frequency interference elimination method and equipment based on dual carrier downlink system - Google Patents
Co-frequency interference elimination method and equipment based on dual carrier downlink system Download PDFInfo
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- CN103379500B CN103379500B CN201310132583.9A CN201310132583A CN103379500B CN 103379500 B CN103379500 B CN 103379500B CN 201310132583 A CN201310132583 A CN 201310132583A CN 103379500 B CN103379500 B CN 103379500B
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Abstract
Embodiments of the present invention provide a kind of co-frequency interference elimination method and equipment based on dual carrier downlink system.This method includes：Adjacent cell list is received from network side；The wireless signal of identical frequency is synchronously received in downlink corresponding with main carrier and downlink corresponding with secondary carrier；In downlink corresponding with secondary carrier, interfered cell is detected from adjacent cell list in each time slot；The information of interfered cell is supplied to downlink corresponding with main carrier；And in downlink corresponding with main carrier, the information based on interfered cell carries out co-channel interference elimination.The co-frequency interference elimination method and equipment based on dual carrier downlink system according to the embodiment of the present invention, it can realize that the co-channel interference for substantially all services time slot eliminates in real time under single carrier connection mode, so as to improve terminal Cochannel interference performance.
Description
Technical field
Embodiments of the present invention are related to the communications field, more particularly to the co-channel interference based on dual carrier downlink system
Removing method and equipment.
Background technology
In UMTS (such as TD-SCDMA and WCDMA) system, generally disappeared using the interference cancellation algorithm of joint-detection
Except co-channel interference.Interference cancellation algorithm requires the information of input serving cell and interfered cell.If input interfered cell and
Actual interfered cell information is inconsistent, and interference cancellation algorithm is then difficult to obtain gratifying effect, so as to influence terminal
Receptivity.Such as in TD-SCDMA system external field environment, terminal may be subject to the co-channel interference from different districts, and
The interfered cell of each business time-slot may be different, and interfered cell may also change in same business time-slot.Therefore,
Effectively detection interfered cell is the key for improving user equipment downlink demodulation performance in real time.
At present, dual carrier technology is introduced respectively in TD-SCDMA and WCDMA system, to improve the appearance of downlink
Amount.Fig. 1 shows the schematic block diagram of dual carrier downlink (DLDC) system.As shown in Figure 1, dual carrier downlink system
10 include primary antenna 101 and auxiliary antenna 102.Primary antenna 101 is used for the wireless signal for receiving downlink corresponding with main carrier,
Auxiliary antenna 102 is used for the wireless signal for receiving downlink corresponding with secondary carrier.
Dual carrier downlink system 10 is usually operated under two kinds of connection modes：Dual carrier connection mode and single carrier connect
Connect pattern.When terminal carries out data service, dual carrier downlink system 10 is operated under dual carrier connection mode, passes through master
Antenna 101 and auxiliary antenna 102 receive down link signal at the same time.When terminal standby or progress speech business, under dual carrier
Line link (DLDC) system 10 is operated under single carrier connection mode, and downlink corresponding with main carrier is received by primary antenna 101
The wireless signal of link, auxiliary antenna 102 are in idle condition.
When dual carrier downlink system is operated under single carrier connection mode, in downlink corresponding with main carrier
Middle progress co-channel interference, which eliminates, generally requires the following operation of execution：
(1) interfered cell is searched for, which generally includes：Calculate the signal of each cell in adjacent cell list under current time slots
Feature vector, and the signal characteristic vector according to each cell calculated, determine multiple interfered cells that may be present；
(2) information configuration of interfered cell is subjected to interference elimination into demodulation module, wherein, make always in current time slots
With the interfered cell information determined in step (1)；
(3) step (1) is returned to after current time slots terminate, re-searches for the interfered cell in next time slot.
Since above step carries out in downlink corresponding with main carrier, thus there are problems with for the program：
A, during interfered cell is searched for, due to travel through interfered cell that may be present, interference cancellation algorithm mould
The cell that block input not actually exists is difficult to avoid without the interfered cell for inputting physical presence.This is just seriously affected
Demodulation performance in search procedure.
B, searching the interfered cell information used after interfered cell in some cycles will not update, if interference feelings
Condition changes, then Interference Cancellation performance can be reduced seriously.
Although problem B can be solved by shortening the search cycle, it can so increase the number of search, so that
Problem A is more serious.
The content of the invention
Embodiments of the present invention provide a kind of co-frequency interference elimination method based on dual carrier downlink system and
Equipment, to solve or alleviate the above-mentioned problems in the prior art at least in part.
In the first aspect, embodiments of the present invention provide a kind of same frequency based on dual carrier downlink system and do
Disturb removing method.This method includes：Adjacent cell list is received from network side；Downlink corresponding with main carrier and with auxiliary load
The wireless signal of identical frequency is synchronously received in the corresponding downlink of ripple；In downlink corresponding with secondary carrier,
Each time slot detects interfered cell from adjacent cell list；The information of interfered cell is supplied to downlink chain corresponding with main carrier
Road；And in downlink corresponding with main carrier, the information based on interfered cell carries out co-channel interference elimination.
In an illustrative embodiments, interfered cell is detected from adjacent cell list in each time slot may include：Base
In interference cancellation algorithm, calculate under current time slots, current frequency, the signal characteristic vector of each cell in adjacent cell list；And
Based on signal characteristic vector, the cell of predetermined quantity is selected from adjacent cell list as interfered cell.
In an illustrative embodiments, the small of predetermined quantity is selected from adjacent cell list based on signal characteristic vector
Area may include as interfered cell：According to the mould order from high to low of signal characteristic vector to each cell in adjacent cell list
It is ranked up；And the mould of selection signal feature vector is higher than the cell of predetermined threshold as interfered cell.
In an illustrative embodiments, interfered cell is detected from adjacent cell list in each time slot may include：Base
In interference cancellation algorithm, calculate under current time slots, current frequency, the signal characteristic vector of each cell in adjacent cell list；And
Based on signal characteristic vector and the correlation of each minizone is combined, the cell of predetermined quantity is selected from adjacent cell list as dry
Disturb cell.
It is small the step of detection interfered cell and based on disturbing from adjacent cell list in an illustrative embodiments
The step of information progress co-channel interference elimination in area, performs in identical time slot.
In an illustrative embodiments, in downlink corresponding with main carrier and downlink chain corresponding with secondary carrier
The wireless signal of identical frequency is synchronously received in road may include：In downlink corresponding with main carrier and corresponding with secondary carrier
Downlink at the same time receive identical time slot, the wireless signal of identical frequency.
In an illustrative embodiments, in downlink corresponding with main carrier, the information based on interfered cell
Carrying out co-channel interference elimination may include：For different time slots, the information for being based respectively on interfered cell carries out co-channel interference elimination.
In second aspect, embodiments of the present invention provide a kind of same frequency based on dual carrier downlink system and do
Disturb abatement apparatus.The co-channel interference abatement apparatus includes：Adjacent cell list reception device, for receiving adjacent cell row from network side
Table；First wireless signal receiver and second wireless singal reception device, for respectively in downlink chain corresponding with main carrier
The wireless signal of identical frequency is synchronously received in road and downlink corresponding with secondary carrier；Interfered cell detection device, is used
In in downlink corresponding with secondary carrier, interfered cell is detected from adjacent cell list in each time slot；Believe interfered cell
Breath provides device, for the information of interfered cell to be supplied to downlink corresponding with main carrier；And co-channel interference eliminates
Device, in downlink corresponding with main carrier, the information based on interfered cell to carry out co-channel interference elimination.
In an illustrative embodiments, which may include：First signal characteristic vector calculates
Device, for based on interference cancellation algorithm, calculating under current time slots, current frequency, the signal of each cell is special in adjacent cell list
Sign vector；And the first interfered cell selection device, for based on signal characteristic vector, predetermined number to be selected from adjacent cell list
The cell of amount is as interfered cell.
In an illustrative embodiments, the first interfered cell selection device can be configured to：According to signal
The order of the mould of feature vector from high to low is ranked up each cell in adjacent cell list；And selection signal feature vector
Mould higher than predetermined threshold cell as interfered cell.
In an illustrative embodiments, interfered cell detection device may include：Secondary signal feature vector calculates dress
Put, for based on interference cancellation algorithm, calculating under current time slots, current frequency, the signal characteristic of each cell in adjacent cell list
Vector；And the second interfered cell selection device, for based on signal characteristic vector and combining the correlation of each minizone, from neighbour
The cell of predetermined quantity is selected in cell list as interfered cell.
In an illustrative embodiments, interfered cell detection device and co-channel interference cancellation element can further by with
It is set to：Perform the operation that interfered cell is detected from adjacent cell list and the letter based on interfered cell respectively in identical time slot
Breath carries out the operation of co-channel interference elimination.
In an illustrative embodiments, the first wireless signal receiver and second wireless singal reception device can be into
One step is configured as：When receiving identical at the same time in downlink corresponding with main carrier and downlink corresponding with secondary carrier
The wireless signal of gap, identical frequency.
In an illustrative embodiments, co-channel interference cancellation element can be configured to：For it is different when
Gap, the information for being based respectively on interfered cell carry out co-channel interference elimination.
The co-frequency interference elimination method and equipment based on dual carrier downlink system according to the embodiment of the present invention,
It can realize that the co-channel interference for substantially all services time slot eliminates in real time under single carrier connection mode, so as to improve end
Hold Cochannel interference performance.
Brief description of the drawings
Fig. 1 shows the schematic block diagram of dual carrier downlink (DLDC) system；And
Fig. 2 shows the co-channel interference elimination side based on dual carrier downlink system according to the embodiment of the present invention
The flow chart of method.
Embodiment
In the first aspect, embodiments of the present invention provide a kind of same frequency based on dual carrier downlink system and do
Disturb removing method.As it was previously stated, dual carrier downlink system is under single carrier connection mode, base station only by with main carrier pair
The downlink answered sends wireless signal to terminal, and downlink corresponding with secondary carrier is in idle condition.According to the present invention
Embodiment co-frequency interference elimination method, when dual carrier downlink system is under single carrier connection mode, pass through
The receiver of terminal is configured so that terminal is in downlink corresponding with main carrier and downlink chain corresponding with secondary carrier
The wireless signal of identical frequency is synchronously received in road, is detected in downlink corresponding with secondary carrier dry under each time slot
Cell is disturbed, and the information of the interfered cell detected is informed into downlink corresponding with main carrier；Corresponding with main carrier
The information based on interfered cell carries out co-channel interference elimination in downlink, and substantially all services time slot is directed to so as to realize
Co-channel interference eliminate in real time.
Fig. 2 shows the co-channel interference elimination side based on dual carrier downlink system according to the embodiment of the present invention
The flow chart of method.As shown in Fig. 2, in step S201, adjacent cell list is received from network side, as interfered cell that may be present
Source.Next, in step S202, in downlink corresponding with main carrier and downlink corresponding with secondary carrier synchronously
Receive the wireless signal of identical frequency.For example, by the way that the receives frequency of auxiliary antenna to be configured to the receives frequency phase with primary antenna
Together, so as to receive identical time slot, phase at the same time in downlink corresponding with main carrier and downlink corresponding with secondary carrier
The wireless signal of same frequency.
Next, in step S203, in downlink corresponding with secondary carrier, in each time slot from adjacent cell list
Detect interfered cell.According to one embodiment, interference cancellation algorithm can be based on, is calculated under current time slots, current frequency, it is adjacent small
The signal characteristic vector of each cell in area's list, then arranges adjacent cell according to the mould order from high to low of signal characteristic vector
Each cell in table is ranked up, and the mould of selection signal feature vector is higher than the cell of predetermined threshold as interfered cell.According to
Another embodiment, can be based on interference cancellation algorithm, calculate under current time slots, current frequency, each cell in adjacent cell list
Signal characteristic vector, be then based on signal characteristic vector and combine each minizone correlation, selected from adjacent cell list
The cell of predetermined quantity is as interfered cell.For example, the difference between the mould of the signal characteristic vector of two cells is less
In the case of, the weaker cell of correlation is selected as interfered cell.
Afterwards, in step S204, the information of interfered cell is supplied to downlink corresponding with main carrier.The interference
Time delay between ID and interfered cell of the information of cell for example including interfered cell.Then, under corresponding with main carrier
In line link, the information based on the interfered cell provided by downlink corresponding with secondary carrier carries out co-channel interference elimination.
It is appreciated that in step S203, in downlink corresponding with secondary carrier, if in some time slot not from adjacent small
Interfered cell is detected in area's list, then does not perform step S204 and S205.For example, in some time slot, if based on interference
The mould of the signal characteristic vector for each cell that cancellation algorithms calculate is below predetermined threshold, then shows not examine under current time slots
Measure interfered cell.Thus, the information of interfered cell is not provided to downlink corresponding with main carrier, it is corresponding with main carrier
Downlink operates so as to also be eliminated without co-channel interference.
Co-frequency interference elimination method according to the embodiment of the present invention, in each time slot, corresponding with secondary carrier
Interfered cell detection operation is performed both by downlink, so as to detect interfered cell that may be present in real time.Once inspection
Interfered cell is measured, the information of interfered cell is just supplied to downlink corresponding with main carrier, is disappeared with carrying out co-channel interference
Remove so that the interfered cell information in downlink corresponding with main carrier can obtain timely updates, so as to improve terminal
Downstream modulation performance and Cochannel interference performance.
In second aspect, embodiments of the present invention provide a kind of same frequency based on dual carrier downlink system and do
Disturb abatement apparatus.The co-channel interference abatement apparatus includes：Adjacent cell list reception device, for receiving adjacent cell row from network side
Table；First wireless signal receiver and second wireless singal reception device, for respectively in downlink chain corresponding with main carrier
The wireless signal of identical frequency is synchronously received in road and downlink corresponding with secondary carrier；Interfered cell detection device, is used
In in downlink corresponding with secondary carrier, interfered cell is detected from adjacent cell list in each time slot；Believe interfered cell
Breath provides device, for the information of interfered cell to be supplied to downlink corresponding with main carrier；And co-channel interference eliminates
Device, in downlink corresponding with main carrier, the information based on interfered cell to carry out co-channel interference elimination.
In an illustrative embodiments, which includes：First signal characteristic vector calculates dress
Put, for based on interference cancellation algorithm, calculating under current time slots, current frequency, the signal characteristic of each cell in adjacent cell list
Vector；And the first interfered cell selection device, for based on signal characteristic vector, predetermined quantity to be selected from adjacent cell list
Cell as interfered cell.
In an illustrative embodiments, the first interfered cell selection device is configured to：It is special according to signal
The order of sign vector field homoemorphism from high to low is ranked up each cell in adjacent cell list；And selection signal feature vector
Mould is higher than the cell of predetermined threshold as interfered cell.
In an illustrative embodiments, interfered cell detection device includes：Secondary signal feature vector computing device,
For based on interference cancellation algorithm, calculating under current time slots, current frequency, in adjacent cell list the signal characteristic of each cell to
Amount；And the second interfered cell selection device, for based on signal characteristic vector and combining the correlation of each minizone, from adjacent small
The cell of predetermined quantity is selected in area's list as interfered cell.
In an illustrative embodiments, interfered cell detection device and co-channel interference cancellation element are further configured
For：Perform the operation that interfered cell is detected from adjacent cell list and the information based on interfered cell respectively in identical time slot
Carry out the operation of co-channel interference elimination.
In an illustrative embodiments, the first wireless signal receiver and second wireless singal reception device are into one
Step is configured as：When receiving identical at the same time in downlink corresponding with main carrier and downlink corresponding with secondary carrier
The wireless signal of gap, identical frequency.
In an illustrative embodiments, co-channel interference cancellation element is configured to：For different time slots,
The information for being based respectively on interfered cell carries out co-channel interference elimination.
The illustrative embodiments of the present invention are described above by reference to attached drawing.Those skilled in the art should manage
Solution, the example that the above embodiment is merely for illustrative purposes and enumerates, rather than for being limited.It is all in the present invention
Teaching and claims under made any modification, equivalent substitution etc., should be included in claimed
In the range of.
Claims (14)
1. a kind of co-frequency interference elimination method based on dual carrier downlink system, including：
Adjacent cell list is received from network side；
The nothing of identical frequency is synchronously received in downlink corresponding with main carrier and downlink corresponding with secondary carrier
Line signal；
In the downlink corresponding with secondary carrier, based on interference cancellation algorithm, arranged in each time slot from the adjacent cell
Interfered cell is detected in table；
The information of the interfered cell is supplied to the downlink corresponding with main carrier；And
In the downlink corresponding with main carrier, the information based on the interfered cell carries out co-channel interference elimination.
2. according to the method described in claim 1, interfered cell bag is wherein detected from the adjacent cell list in each time slot
Include：
Based on the interference cancellation algorithm, calculate under current time slots, current frequency, the signal of each cell in the adjacent cell list
Feature vector；And
Based on the signal characteristic vector, select the cell of predetermined quantity small as the interference from the adjacent cell list
Area.
3. according to the method described in claim 2, wherein selected based on the signal characteristic vector from the adjacent cell list
The cell of predetermined quantity includes as the interfered cell：
Each cell in the adjacent cell list is ranked up according to the mould order from high to low of the signal characteristic vector；
And
The mould of selection signal feature vector is higher than the cell of predetermined threshold as the interfered cell.
4. according to the method described in claim 1, interfered cell bag is wherein detected from the adjacent cell list in each time slot
Include：
Based on the interference cancellation algorithm, calculate under current time slots, current frequency, the signal of each cell in the adjacent cell list
Feature vector；And
Based on the signal characteristic vector and the correlation of each minizone is combined, predetermined quantity is selected from the adjacent cell list
Cell as the interfered cell.
5. according to the method described in claim 1, the step of interfered cell is detected wherein from the adjacent cell list and base
Performed the step of the information of the interfered cell carries out co-channel interference elimination in identical time slot.
6. according to the method described in claim 1, wherein downlink corresponding with main carrier and it is corresponding with secondary carrier under
The wireless signal of identical frequency is synchronously received in line link to be included：Downlink corresponding with main carrier and with secondary carrier pair
In the downlink answered while receive identical time slot, the wireless signal of identical frequency.
7. according to the method described in claim 1, wherein in downlink corresponding with main carrier, based on the interfered cell
Information carry out co-channel interference eliminate include：For different time slots, the information for being based respectively on the interfered cell is carried out with frequency
Interference eliminates.
8. the co-channel interference abatement apparatus based on dual carrier downlink system, including：
Adjacent cell list reception device, for receiving adjacent cell list from network side；
First wireless signal receiver and second wireless singal reception device, for respectively in downlink chain corresponding with main carrier
The wireless signal of identical frequency is synchronously received in road and downlink corresponding with secondary carrier；
Interfered cell detection device, in the downlink corresponding with secondary carrier, based on interference cancellation algorithm, every
A time slot detects interfered cell from the adjacent cell list；
Interfered cell information provides device, for the information of the interfered cell to be supplied to the downlink corresponding with main carrier
Link；And
Co-channel interference cancellation element, in the downlink corresponding with main carrier, the letter based on the interfered cell
Breath carries out co-channel interference elimination.
9. equipment according to claim 8, wherein the interfered cell detection device includes：
First signal characteristic vector computing device, for based on the interference cancellation algorithm, calculating current time slots, current frequency
Under, the signal characteristic vector of each cell in the adjacent cell list；And
First interfered cell selection device, for based on the signal characteristic vector, being selected from the adjacent cell list predetermined
The cell of quantity is as the interfered cell.
10. equipment according to claim 9, wherein first interfered cell selection device is configured to：
Each cell in the adjacent cell list is ranked up according to the mould order from high to low of the signal characteristic vector；
And
The mould of selection signal feature vector is higher than the cell of predetermined threshold as the interfered cell.
11. equipment according to claim 8, wherein the interfered cell detection device includes：
Secondary signal feature vector computing device, for based on the interference cancellation algorithm, calculating current time slots, current frequency
Under, the signal characteristic vector of each cell in the adjacent cell list；And
Second interfered cell selection device, for the correlation based on the signal characteristic vector and each minizone of combination, from institute
State and the cell of predetermined quantity is selected in adjacent cell list as the interfered cell.
12. equipment according to claim 8, wherein the interfered cell detection device and the co-channel interference cancellation element
It is configured to：Perform operation and the base that interfered cell is detected from the adjacent cell list respectively in identical time slot
Information in the interfered cell carries out the operation of co-channel interference elimination.
13. equipment according to claim 8, wherein first wireless signal receiver and the second wireless singal
Reception device is configured to：In the downlink corresponding with main carrier and the downlink chain corresponding with secondary carrier
Identical time slot, the wireless signal of identical frequency are received in road at the same time.
14. equipment according to claim 8, wherein the co-channel interference cancellation element is configured to：For not
Same time slot, the information for being based respectively on the interfered cell carry out co-channel interference elimination.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| US201261624923P | 2012-04-16 | 2012-04-16 | |
| US61/624,923 | 2012-04-16 |
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| CN105472763B (en) * | 2014-08-12 | 2019-08-09 | 中国电信股份有限公司 | A kind of data processing method and mobile terminal of mobile terminal |
| CN105792222B (en) * | 2014-12-23 | 2020-02-11 | 中兴通讯股份有限公司 | Method for eliminating co-channel interference, detection method and device and base station |
Citations (3)
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|---|---|---|---|---|
| CN101145826A (en) * | 2006-09-13 | 2008-03-19 | 大唐移动通信设备有限公司 | A multi-carrier networking method and radio network controller, base station and terminal |
| CN101345970A (en) * | 2007-07-09 | 2009-01-14 | 中兴通讯股份有限公司 | Method for measuring neighbor community interference of multi-carrier wave reinforced ascending access system |
| CN102165716A (en) * | 2008-09-19 | 2011-08-24 | 延世大学工业学术合作社 | Synchronization method of femtocell base station and femtocell base station using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050265467A1 (en) * | 2004-05-25 | 2005-12-01 | Texas Instruments Incorporated | Intercarrier interference cancellation algorithm |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145826A (en) * | 2006-09-13 | 2008-03-19 | 大唐移动通信设备有限公司 | A multi-carrier networking method and radio network controller, base station and terminal |
| CN101345970A (en) * | 2007-07-09 | 2009-01-14 | 中兴通讯股份有限公司 | Method for measuring neighbor community interference of multi-carrier wave reinforced ascending access system |
| CN102165716A (en) * | 2008-09-19 | 2011-08-24 | 延世大学工业学术合作社 | Synchronization method of femtocell base station and femtocell base station using the same |
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Effective date of registration: 20200429 Address after: Ford street, Grand Cayman, Cayman Islands Patentee after: Kaiwei international Co. Address before: Hamilton, Bermuda Patentee before: Marvell International Ltd. Effective date of registration: 20200429 Address after: Singapore City Patentee after: Marvell Asia Pte. Ltd. Address before: Ford street, Grand Cayman, Cayman Islands Patentee before: Kaiwei international Co. |
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Granted publication date: 20180413 |