CN103379500A - Method and apparatus for eliminating co-frequency interference based on dual carrier downlink system - Google Patents
Method and apparatus for eliminating co-frequency interference based on dual carrier downlink system Download PDFInfo
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- CN103379500A CN103379500A CN2013101325839A CN201310132583A CN103379500A CN 103379500 A CN103379500 A CN 103379500A CN 2013101325839 A CN2013101325839 A CN 2013101325839A CN 201310132583 A CN201310132583 A CN 201310132583A CN 103379500 A CN103379500 A CN 103379500A
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Abstract
The invention provides a method and an apparatus for eliminating the co-frequency interference based on a dual carrier downlink system. The method comprises the steps of receiving the list of neighbor cells from a network side; receiving wireless signals of the same frequency from a downlink corresponding to main carriers and a downlink corresponding to auxiliary carriers synchronously; in the downlink corresponding to auxiliary carriers, detecting interference cells among the list of neighbor cells at each time slot; providing the information of the neighbor cells to the downlink corresponding to main carriers; and eliminating the co-frequency interference based on the information of the neighbor cell. By means of the method and the apparatus for eliminating the co-frequency interference based on a dual carrier downlink system, the co-frequency interference at almost all time slots can be eliminated in real time, so that the co-frequency interference resistance of a terminal is improved.
Description
Technical field
Embodiments of the present invention relate to the communications field, relate in particular to co-channel interference removing method and equipment based on two carrier wave downlink system.
Background technology
In UMTS (for example TD-SCDMA and WCDMA) system, generally adopt the interference cancellation algorithm of joint-detection to eliminate co-channel interference.Interference cancellation algorithm requires the information of input Serving cell and interfered cell.If the interfered cell information of the interfered cell of input and reality is inconsistent, interference cancellation algorithm then is difficult to obtain gratifying effect, thereby affects the receptivity of terminal.For example 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, even interfered cell also may change in same business time-slot.Therefore, effectively detecting in real time interfered cell is the key that improves the descending demodulation performance of terminal.
At present, in TD-SCDMA and WCDMA system, two ZAP have been introduced respectively, to improve the capacity of down link.Fig. 1 shows the schematic block diagram of two carrier wave down link (DLDC) systems.As shown in Figure 1, two carrier wave downlink system 10 comprise main antenna 101 and auxiliary antenna 102.Main antenna 101 is used for receiving the wireless signal of the down link corresponding with main carrier, and auxiliary antenna 102 is used for receiving the wireless signal of the down link corresponding with auxiliary carrier wave.
Two carrier wave downlink system 10 are usually operated under two kinds of connection modes: two carrier wave connection modes and single carrier connection mode.When terminal was carried out data service, two carrier wave downlink system 10 were operated under two carrier wave connection modes, by main antenna 101 and 102 while of auxiliary antenna receiving downlink signal.When terminal standby or when carrying out speech business, two carrier wave down links (DLDC) system 10 is operated under the single carrier connection mode, receives the wireless signal of the down link corresponding with main carrier by main antenna 101, and auxiliary antenna 102 is in idle condition.
When two carrier wave downlink system are operated in single carrier connection mode lower time, in the down link corresponding with main carrier, carry out co-channel interference and eliminate and generally need to carry out following the operation:
(1) search interfered cell, this operation generally includes: calculate under the current time slots signal characteristic vector of each residential quarter in the adjacent cell list, and according to the signal characteristic vector of each residential quarter that calculates, determine a plurality of interfered cells that may exist;
(2) information configuration of interfered cell is disturbed elimination in demodulation module, wherein, use the interfered cell information of determining in the step (1) in current time slots always;
(3) after current time slots finishes, turn back to step (1), again search for the interfered cell in next time slot.
Because above step is all carried out in the down link corresponding with main carrier, thereby there is following problem in this scheme:
A, in the process of search interfered cell owing to will travel through the interfered cell that may exist, the interference cancellation algorithm module is inputted actual non-existent residential quarter and is not inputted in esse interfered cell and be difficult to avoid.This has just had a strong impact on the demodulation performance in the search procedure.
B, search the interfered cell information that uses after the interfered cell can not upgrade in some cycles, if disturbed condition changes, then the Interference Cancellation performance can seriously reduce.
Although problem B can solve by shortening the search cycle, can increase like this number of times of search, thereby so that problem A is more serious.
Summary of the invention
Embodiments of the present invention provide a kind of co-channel interference removing method and equipment based on two carrier wave downlink system, to solve or to alleviate at least in part the above-mentioned problems in the prior art.
In first aspect, embodiments of the present invention provide a kind of co-channel interference removing method based on two carrier wave downlink system.The method comprises: receive adjacent cell list from network side; The down link corresponding with main carrier and with down link corresponding to auxiliary carrier wave in synchronously receive the wireless signal of same frequency; In the down link corresponding with auxiliary carrier wave, from adjacent cell list, detect interfered cell at each time slot; The information of interfered cell is offered the down link corresponding with main carrier; And in the down link corresponding with main carrier, carry out co-channel interference based on the information of interfered cell and eliminate.
In an illustrative embodiments, detecting interfered cell at each time slot from adjacent cell list can comprise: based on interference cancellation algorithm, calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the adjacent cell list; And based on signal characteristic vector, from adjacent cell list, select the residential quarter of predetermined quantity as interfered cell.
In an illustrative embodiments, select the residential quarter of predetermined quantity can comprise as interfered cell from adjacent cell list based on signal characteristic vector: the mould order from high to low according to signal characteristic vector sorts to each residential quarter in the adjacent cell list; And select the mould of signal characteristic vector to be higher than the residential quarter of predetermined threshold as interfered cell.
In an illustrative embodiments, detecting interfered cell at each time slot from adjacent cell list can comprise: based on interference cancellation algorithm, calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the adjacent cell list; And based on signal characteristic vector and in conjunction with the correlation of each minizone, from adjacent cell list, select the residential quarter of predetermined quantity as interfered cell.
In an illustrative embodiments, from adjacent cell list, detect the step of interfered cell and carry out the step that co-channel interference eliminates based on the information of interfered cell and in identical time slot, carry out.
In an illustrative embodiments, with down link corresponding to main carrier and with down link corresponding to auxiliary carrier wave in synchronously receive same frequency wireless signal can comprise: with down link corresponding to main carrier and with down link corresponding to auxiliary carrier wave in receive simultaneously the wireless signal of identical time slot, same frequency.
In an illustrative embodiments, in the down link corresponding with main carrier, carry out co-channel interference based on the information of interfered cell and eliminate and to comprise: for different time slots, carry out co-channel interference based on the information of interfered cell respectively and eliminate.
In second aspect, embodiments of the present invention provide a kind of co-channel interference abatement apparatus based on two carrier wave downlink system.This co-channel interference abatement apparatus comprises: the adjacent cell list receiving system is used for receiving adjacent cell list from network side; The first wireless signal receiver and the second wireless signal receiver are used for respectively synchronously receiving the wireless signal of same frequency at the down link corresponding with main carrier with down link corresponding to auxiliary carrier wave; The interfered cell checkout gear is used at the down link corresponding with auxiliary carrier wave, detects interfered cell at each time slot from adjacent cell list; The interfered cell information generator is used for the information of interfered cell is offered the down link corresponding with main carrier; And the co-channel interference cancellation element, be used at the down link corresponding with main carrier, carry out co-channel interference based on the information of interfered cell and eliminate.
In an illustrative embodiments, this interfered cell checkout gear can comprise: first signal characteristic vector calculation element, be used for based on interference cancellation algorithm, and calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the adjacent cell list; And the first interfered cell choice device, be used for based on signal characteristic vector, from adjacent cell list, select the residential quarter of predetermined quantity as interfered cell.
In an illustrative embodiments, the first interfered cell choice device can further be configured to: the mould order from high to low according to signal characteristic vector sorts to each residential quarter in the adjacent cell list; And select the mould of signal characteristic vector to be higher than the residential quarter of predetermined threshold as interfered cell.
In an illustrative embodiments, the interfered cell checkout gear can comprise: secondary signal characteristic vector calculation element, be used for based on interference cancellation algorithm, and calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the adjacent cell list; And the second interfered cell choice device, be used for from adjacent cell list, selecting the residential quarter of predetermined quantity as interfered cell based on signal characteristic vector and in conjunction with the correlation of each minizone.
In an illustrative embodiments, the interfered cell checkout gear can further be configured to the co-channel interference cancellation element: carry out respectively the operation that detects interfered cell from adjacent cell list and the operation of carrying out the co-channel interference elimination based on the information of interfered cell in identical time slot.
In an illustrative embodiments, the first wireless signal receiver can further be configured to the second wireless signal receiver: with down link corresponding to main carrier and with down link corresponding to auxiliary carrier wave in receive simultaneously the wireless signal of identical time slot, same frequency.
In an illustrative embodiments, the co-channel interference cancellation element can further be configured to: for different time slots, carry out co-channel interference based on the information of interfered cell respectively and eliminate.
According to the embodiment of the present invention co-channel interference removing method and equipment based on two carrier wave downlink system, under the single carrier connection mode, can realize eliminating in real time for the co-channel interference of nearly all business time-slot, thereby improve the anti-co-channel interference performance of terminal.
Description of drawings
Fig. 1 shows the schematic block diagram of two carrier wave down link (DLDC) systems; And
Fig. 2 shows the flow chart based on the co-channel interference removing method of two carrier wave downlink system according to the embodiment of the present invention.
Embodiment
In first aspect, embodiments of the present invention provide a kind of co-channel interference removing method based on two carrier wave downlink system.As previously mentioned, two carrier wave downlink system are under the single carrier connection mode, and the base station only sends wireless signal by the down link corresponding with main carrier to terminal, and the down link corresponding with auxiliary carrier wave is in idle condition.Co-channel interference removing method according to the embodiment of the present invention, when two carrier wave downlink system are in single carrier connection mode lower time, be configured by the receiver to terminal, so that terminal the down link corresponding with main carrier and with down link corresponding to auxiliary carrier wave in synchronously receive the wireless signal of same frequency, in the down link corresponding with auxiliary carrier wave, detect the interfered cell under each time slot, and with the information notification down link corresponding with main carrier of the interfered cell that detects; In the down link corresponding with main carrier, carry out co-channel interference based on the information of interfered cell and eliminate, thereby can realize eliminating in real time for the co-channel interference of nearly all business time-slot.
Fig. 2 shows the flow chart based on the co-channel interference removing method of two carrier wave downlink system according to the embodiment of the present invention.As shown in Figure 2, at step S201, receive adjacent cell list from network side, as the interfered cell source that may exist.Next, at step S202, the down link corresponding with main carrier and with down link corresponding to auxiliary carrier wave in synchronously receive the wireless signal of same frequency.For example, be configured to by the receive frequency with auxiliary antenna identical with the receive frequency of main antenna, thereby with down link corresponding to main carrier and with down link corresponding to auxiliary carrier wave in receive simultaneously the wireless signal of identical time slot, same frequency.
Next, at step S203, in the down link corresponding with auxiliary carrier wave, from adjacent cell list, detect interfered cell at each time slot.According to an embodiment, can be based on interference cancellation algorithm, calculate under current time slots, the current frequency, the signal characteristic vector of each residential quarter in the adjacent cell list, then the mould order from high to low according to signal characteristic vector sorts to each residential quarter in the adjacent cell list, selects the mould of signal characteristic vector to be higher than the residential quarter of predetermined threshold as interfered cell.According to another embodiment, can be based on interference cancellation algorithm, calculate under current time slots, the current frequency, the signal characteristic vector of each residential quarter in the adjacent cell list, then based on signal characteristic vector and in conjunction with the correlation of each minizone, from adjacent cell list, select the residential quarter of predetermined quantity as interfered cell.For example, in the less situation of the difference between the mould of the signal characteristic vector of two residential quarters, select the weak residential quarter of correlation as interfered cell.
Afterwards, at step S204, the information of interfered cell is offered the down link corresponding with main carrier.The information of described interfered cell for example comprises the ID of interfered cell and the time of delay between interfered cell.Subsequently, in the down link corresponding with main carrier, carry out co-channel interference based on the information of the interfered cell that is provided by the down link corresponding with auxiliary carrier wave and eliminate.
Be appreciated that at step S203, in the down link corresponding with auxiliary carrier wave, if from adjacent cell list, do not detect interfered cell at certain time slot, then not execution in step S204 and S205.For example, in certain time slot, if the mould of the signal characteristic vector of each residential quarter that calculates based on interference cancellation algorithm all is lower than predetermined threshold, then show under current time slots not detect interfered cell.Thereby, the information of interfered cell is not provided to the down link corresponding with main carrier, thereby also not carrying out co-channel interference, the down link corresponding with main carrier eliminate operation.
Co-channel interference removing method according to the embodiment of the present invention in each time slot, is all carried out interfered cell and is detected operation, thereby can detect in real time the interfered cell that may exist in the down link corresponding with auxiliary carrier wave.In case detect interfered cell, just the information with interfered cell offers the down link corresponding with main carrier, eliminate to carry out co-channel interference, so that the interfered cell information in the down link corresponding with main carrier can in time obtain renewal, thereby descending demodulation performance and the anti-co-channel interference performance of terminal have been improved.
In second aspect, embodiments of the present invention provide a kind of co-channel interference abatement apparatus based on two carrier wave downlink system.This co-channel interference abatement apparatus comprises: the adjacent cell list receiving system is used for receiving adjacent cell list from network side; The first wireless signal receiver and the second wireless signal receiver are used for respectively synchronously receiving the wireless signal of same frequency at the down link corresponding with main carrier with down link corresponding to auxiliary carrier wave; The interfered cell checkout gear is used at the down link corresponding with auxiliary carrier wave, detects interfered cell at each time slot from adjacent cell list; The interfered cell information generator is used for the information of interfered cell is offered the down link corresponding with main carrier; And the co-channel interference cancellation element, be used at the down link corresponding with main carrier, carry out co-channel interference based on the information of interfered cell and eliminate.
In an illustrative embodiments, this interfered cell checkout gear comprises: first signal characteristic vector calculation element, be used for based on interference cancellation algorithm, and calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the adjacent cell list; And the first interfered cell choice device, be used for based on signal characteristic vector, from adjacent cell list, select the residential quarter of predetermined quantity as interfered cell.
In an illustrative embodiments, the first interfered cell choice device further is configured to: the mould order from high to low according to signal characteristic vector sorts to each residential quarter in the adjacent cell list; And select the mould of signal characteristic vector to be higher than the residential quarter of predetermined threshold as interfered cell.
In an illustrative embodiments, the interfered cell checkout gear comprises: secondary signal characteristic vector calculation element, be used for based on interference cancellation algorithm, and calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the adjacent cell list; And the second interfered cell choice device, be used for from adjacent cell list, selecting the residential quarter of predetermined quantity as interfered cell based on signal characteristic vector and in conjunction with the correlation of each minizone.
In an illustrative embodiments, the interfered cell checkout gear further is configured to the co-channel interference cancellation element: carry out respectively the operation that detects interfered cell from adjacent cell list and the operation of carrying out the co-channel interference elimination based on the information of interfered cell in identical time slot.
In an illustrative embodiments, the first wireless signal receiver further is configured to the second wireless signal receiver: with down link corresponding to main carrier and with down link corresponding to auxiliary carrier wave in receive simultaneously the wireless signal of identical time slot, same frequency.
In an illustrative embodiments, the co-channel interference cancellation element further is configured to: for different time slots, carry out co-channel interference based on the information of interfered cell respectively and eliminate.
Abovely with reference to accompanying drawing illustrative embodiments of the present invention is described.It should be appreciated by those skilled in the art that above-mentioned execution mode only is the example of enumerating for purposes of illustration, rather than be used for limiting.All any modifications of under instruction of the present invention and claim protection range, doing, be equal to replacement etc., all should be included in the scope of protection of present invention.
Claims (14)
1. co-channel interference removing method based on two carrier wave downlink system comprises:
Receive adjacent cell list from network side;
The down link corresponding with main carrier and with down link corresponding to auxiliary carrier wave in synchronously receive the wireless signal of same frequency;
In the described down link corresponding with auxiliary carrier wave, from described adjacent cell list, detect interfered cell at each time slot;
The information of described interfered cell is offered the described down link corresponding with main carrier; And
In the described down link corresponding with main carrier, carry out co-channel interference based on the information of described interfered cell and eliminate.
2. method according to claim 1, wherein detect interfered cell at each time slot and comprise from described adjacent cell list:
Based on interference cancellation algorithm, calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the described adjacent cell list; And
Based on described signal characteristic vector, from described adjacent cell list, select the residential quarter of predetermined quantity as described interfered cell.
3. method according to claim 2, wherein from described adjacent cell list, select the residential quarter of predetermined quantity to comprise as described interfered cell based on described signal characteristic vector:
Mould order from high to low according to described signal characteristic vector sorts to each residential quarter in the described adjacent cell list; And
Select the mould of signal characteristic vector to be higher than the residential quarter of predetermined threshold as described interfered cell.
4. method according to claim 1, wherein detect interfered cell at each time slot and comprise from described adjacent cell list:
Based on interference cancellation algorithm, calculate under current time slots, the current frequency signal characteristic vector of each residential quarter in the described adjacent cell list; And
Based on described signal characteristic vector and in conjunction with the correlation of each minizone, from described adjacent cell list, select the residential quarter of predetermined quantity as described interfered cell.
5. method according to claim 1 wherein detects the step of interfered cell and carries out the step that co-channel interference eliminates based on the information of described interfered cell and carry out in identical time slot from described adjacent cell list.
6. method according to claim 1, wherein with down link corresponding to main carrier and with down link corresponding to auxiliary carrier wave in synchronously receive same frequency wireless signal comprise: with down link corresponding to main carrier and with down link corresponding to auxiliary carrier wave in receive simultaneously the wireless signal of identical time slot, same frequency.
7. method according to claim 1, wherein in the down link corresponding with main carrier, carrying out the co-channel interference elimination based on the information of described interfered cell comprises: for different time slots, carry out co-channel interference based on the information of described interfered cell respectively and eliminate.
8. based on the co-channel interference abatement apparatus of two carrier wave downlink system, comprising:
The adjacent cell list receiving system is used for receiving adjacent cell list from network side;
The first wireless signal receiver and the second wireless signal receiver are used for respectively synchronously receiving the wireless signal of same frequency at the down link corresponding with main carrier with down link corresponding to auxiliary carrier wave;
The interfered cell checkout gear is used at the described down link corresponding with auxiliary carrier wave, detects interfered cell at each time slot from described adjacent cell list;
The interfered cell information generator is used for the information of described interfered cell is offered the described down link corresponding with main carrier; And
The co-channel interference cancellation element is used at the described down link corresponding with main carrier, carries out co-channel interference based on the information of described interfered cell and eliminates.
9. equipment according to claim 8, wherein said interfered cell checkout gear comprises:
First signal characteristic vector calculation element is used for based on interference cancellation algorithm, calculates under current time slots, the current frequency signal characteristic vector of each residential quarter in the described adjacent cell list; And
The first interfered cell choice device is used for based on described signal characteristic vector, selects the residential quarter of predetermined quantity as described interfered cell from described adjacent cell list.
10. equipment according to claim 9, wherein said the first interfered cell choice device further is configured to:
Mould order from high to low according to described signal characteristic vector sorts to each residential quarter in the described adjacent cell list; And
Select the mould of signal characteristic vector to be higher than the residential quarter of predetermined threshold as described interfered cell.
11. equipment according to claim 8, wherein said interfered cell checkout gear comprises:
Secondary signal characteristic vector calculation element is used for based on interference cancellation algorithm, calculates under current time slots, the current frequency signal characteristic vector of each residential quarter in the described adjacent cell list; And
The second interfered cell choice device is used for selecting the residential quarter of predetermined quantity as described interfered cell from described adjacent cell list based on described signal characteristic vector and in conjunction with the correlation of each minizone.
12. equipment according to claim 8, wherein said interfered cell checkout gear further is configured to described co-channel interference cancellation element: carry out respectively the operation that detects interfered cell from described adjacent cell list and the operation of carrying out the co-channel interference elimination based on the information of described interfered cell in identical time slot.
13. equipment according to claim 8, wherein said the first wireless signal receiver further is configured to described the second wireless signal receiver: with described down link corresponding to main carrier and with described down link corresponding to auxiliary carrier wave in receive simultaneously the wireless signal of identical time slot, same frequency.
14. equipment according to claim 8, wherein said co-channel interference cancellation element further is configured to: for different time slots, carry out co-channel interference based on the information of described interfered cell respectively and eliminate.
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| 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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| CN103379500A true CN103379500A (en) | 2013-10-30 |
| CN103379500B CN103379500B (en) | 2018-04-13 |
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| CN201310132583.9A Expired - Fee Related CN103379500B (en) | 2012-04-16 | 2013-04-08 | Co-frequency interference elimination method and equipment based on dual carrier downlink system |
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| WO2016101471A1 (en) * | 2014-12-23 | 2016-06-30 | 中兴通讯股份有限公司 | Common-frequency interference elimination method, detection method and device, and base station |
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| CN105472763A (en) * | 2014-08-12 | 2016-04-06 | 中国电信股份有限公司 | Data processing method of mobile terminal, and mobile terminal using same |
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| 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 |
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