CN1744747A - Method for restrainting down in-phase channel interference of adjacent community for wireless cellular network - Google Patents
Method for restrainting down in-phase channel interference of adjacent community for wireless cellular network Download PDFInfo
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Abstract
When each base station or sector in cellular system sends data to each user, bit interleave is inserted between encoding process and modulation process. Different interleave patterns are adopted for different base stations or different sectors. Receiving end of cellular system determines intensity of interference signal in same channel of adjacent base stations. If intensity is larger than prearranged threshold value, then multi user combined detection is carried out and interleave patterns for distinguishing different subzones are utilized. If intensity is smaller than prearranged threshold value, then single user reception is carried out. Using interleave patterns, the invention distinguishes different subzones so as to restrain influence of interference of adjacent subzones effectively. Features are: avoiding complicated scheme for managing wireless resources, and saving system overhead.
Description
Technical field
The present invention relates to the method that a kind of descending cochannel of inhibition adjacent cell that is used for wireless cellular network disturbs, belong to wireless communication technology field.
Background technology
The honeycomb notion is an important breakthrough that solves frequency deficiency and user capacity problem, and the cellular cell structure is the basic structure of present mobile communication system.In the down link of cellular cell structure, adjacent sub-district cochannel disturbs (adjacent cell takies the interference that the down link of same time frequency unit causes) that the raising of power system capacity and spectrum utilization efficiency has been produced very big influence.
For the cochannel that overcomes adjacent sub-district disturbs, in TDMA/FDMA (TDMA/FDMA) system, the main method that adopts is to increase the cellular cell frequency reuse, for example the most frequently used frequency reuse is 7 cell structure, the cochannel that can avoid adjacent with it sub-district to introduce fully disturbs, but such way has also significantly reduced the spectrum utilization efficiency (1/7) of overall system.Increase the system spectrum utilization ratio if desired, then can reduce the multiplexing coefficient of system frequency (for example 4,3,2,1), but the cochannel of just having introduced adjacent sub-district like this disturbs, and has paid and has disturbed the cost that increases.
The another kind of method that effectively reduces adjacent area interference when not increasing the cell frequency multiplex coefficient is to adopt directional antenna, utilizes directional antenna to suppress the influence that adjacent sub-district cochannel disturbs for the differentiation in space.
Overcoming on the problem of multi-user interference, verdu has proposed to be applied to the Multiuser Detection structure of spread spectrum system, its basic conception is exactly the employed frequency expansion sequence of signal of the priori receiver utilization sends to(for) all users, not that other user is disturbed as noise processed, but utilize some linear process, itself and useful signal are detected together, simultaneously can also utilize some nonlinear processing (for example Interference Cancellation or the like) to improve the detection performance, under certain conditions, can reach the performance (just having removed multi-user interference fully) that single user receives.And poor combines chnnel coding and Multiuser Detection, introduces the turbo iteration structure simultaneously, has just obtained the structure of coding Multiuser Detection, and it can have compromise preferably aspect systematic function and the Multiuser Detection complexity.
The notion of interlacing multi-address is proposed by Li Ping the earliest, and its substance comprises: transmitting terminal inserts bit interleaver between encoder and modulator, and makes different users use different interlacing patterns.At receiving terminal, then to disturb the strong and weak coding Multiuser Detection of selecting whether to use according to the cochannel that is subjected to, disturb weak situation to use the demodulation of single user's detection method, decoding data to cochannel; Cochannel is disturbed strong situation, then use the method for coding Multiuser Detection.
Traditional employing increases the cell frequency multiplex coefficient and overcomes the spectrum utilization efficiency that method that adjacent sub-district cochannel disturbs has influenced system greatly, and adopt directional antenna to distinguish the method for sector, on the basis that does not increase the cell frequency multiplex coefficient, effectively reduced the influence that cochannel disturbs on the one hand, on the other hand, increased the expense that travelling carriage switches, the influence that also can not avoid cochannel to disturb simultaneously fully.Simultaneously, in order to reduce the impression that cochannel disturbs preferably, in general, system all must adopt comparatively complicated radio resource management scenarios to guarantee that the user of the close together of neighbor cell does not share same channel or the like.
Summary of the invention
The objective of the invention is, in order to improve the spectrum utilization efficiency of system, cellular system need use lower frequency reuse, like this, just there is shared frequency range neighbor cell or sector, and therefore the influence that has inevitably brought cochannel to disturb in neighbor cell the present invention proposes the method that a kind of descending cochannel of inhibition adjacent cell that is used for wireless cellular network disturbs, introduce interlacing multi-address and coding Multiuser Detection, disturb with the cochannel that suppresses neighbor cell.
The method that the descending cochannel of the inhibition adjacent cell that is used for wireless cellular network that the present invention proposes disturbs comprises the steps:
(1) Bit Interleave is inserted in each base station in the cellular system or sector between coding and modulated process when the user sends data, and different interlacing patterns is adopted in different base stations or sector;
(2) travelling carriage of cellular system is judged the interference signal intensity from one or several main cochannel interference source of adjacent base station or sector, some signal strength signal intensities of disturbing are greater than setting threshold, then carry out multi-user association and detect reception, use the different base station of interlacing pattern difference, if intensity less than setting thresholding, is then carried out single user and is received.
The method of the Bit Interleave described in above-mentioned is: in each base station or the sector when each travelling carriage sends data, between channel encoder and modulator, the operation of insertion Bit Interleave adopts the specific interlacing pattern in this base station or sector to interweave to coded-bit.
In the said method, the method that multi-user association detects may further comprise the steps:
(1) travelling carriage of cellular system receives the signal from base station or sector, after carrier wave demodulation and data demodulates, carry out Multiuser Detection according to the co-channel signal of the signal, the characteristic of channel, adjacent base station or the sector that receive and the data flow of following step (4) output, obtain sending the posteriority likelihood ratio of coded-bit in the signal;
(2) above-mentioned posteriority likelihood ratio is carried out the corresponding bit deinterleaving of Bit Interleave used when sending with affiliated data flow;
(3) data flow that obtains according to above-mentioned bit deinterleaving, the corresponding channel decoding of using when carrying out of chnnel coding, and the posteriority likelihood ratio of the preceding data of delivery channel coding with this data flow transmission;
(4) with the posteriority likelihood ratio of data before the above-mentioned chnnel coding according to data flow under it, carry out chnnel coding and Bit Interleave identical when sending with this data flow, the data flow that obtains is sent in the Multiuser Detection process of step (1);
(5) adjudicate according to the posteriority likelihood ratio of the data that step (3) is obtained repeating step (1)～(4), obtains the data flow that travelling carriage needs.
In the said method, single user's detection method may further comprise the steps:
(1) travelling carriage of cellular system receives the signal of base station or sector, after carrier wave demodulation and data demodulates, pick the needed data flow of this travelling carriage by matched filtering, and will share the interference signal of same frequency range or time frequency unit as noise processed with this travelling carriage;
(2) according to the needed data flow of this travelling carriage that detects after the above-mentioned matched filtering, corresponding channel decoding of Bit Interleave, chnnel coding and the bit deinterleaving used when carrying out respectively, and judgement dateout with this data flow transmission.
The method that the descending cochannel of the inhibition adjacent cell that is used for wireless cellular network that the present invention proposes disturbs, the notion that interlacing multi-address is distinguished the user is incorporated in the downlink transfer in the cellular system, use interlacing pattern to distinguish different base station or sector, when if same down channel is shared in adjacent sub-district, the travelling carriage that uses these identical down channels is when receiving, can be according to the power of disturbing, adopt different reception programmes, particularly disturb under the stronger situation at adjacent sub-district cochannel, the method that can adopt the coding multi-user association to detect, the data flow of sharing this channel that will belong to different base station detects respectively, the data flow that keeps this travelling carriage needs, abandon other interfering data, thereby effectively offset the influence that cochannel disturbs, simultaneously, the present invention can also combine with the method for multiplexing coefficient of design frequency in the prior art and introducing directional antenna, the cochannel that can effectively suppress neighbor cell on the one hand (for example disturbs, can adopt the lower system of frequency reuse, and for the user of the overlapped part of adjacent cell spectrum, adopting method of the present invention to overcome cochannel disturbs), on the other hand, can avoid too complicated radio resource management scenarios, and disturb for the unavoidable cochannel of simple radio resource management method institute, can adopt method of the present invention to overcome, thereby save overhead.
Description of drawings
Fig. 1 is a principle schematic of the present invention, is that 2 cellular system is an example with frequency reuse.
Fig. 2 is two adjacent base stations and belong to the structural representation of travelling carriage of the shared same channel (time frequency unit) of these two base stations respectively among Fig. 1.
Fig. 3 is the process of transmitting schematic diagram that base station 1 (BS1) sends signal among Fig. 2 to the travelling carriage 1 (MS1) of being served.
Fig. 4 is the principle schematic that travelling carriage 1 carries out decision process to the received signal.
Fig. 5 is single user's receiving course schematic diagram among Fig. 4.
Fig. 6 is a multi-user association testing process schematic diagram among Fig. 4.
Fig. 7 combines the present invention to suppress the principle schematic that cochannel disturbs with the technology of existing directional antenna differentiation sector.With angle of distribution is that to encourage the antenna structure of three sectors be example for the centers of 120 degree.
Among Fig. 1-Fig. 4,11-base station 1 (BS1); 12-base station 2 (BS2); 13-travelling carriage 1 (MS1); 14-travelling carriage 2 (MS2); 71-travelling carriage 1 (MS1); 72-travelling carriage 2 (MS2); 73: travelling carriage 3 (MS3)
Embodiment
The method that the descending cochannel of the inhibition adjacent cell that is used for wireless cellular network that the present invention proposes disturbs, at first, each base station in the cellular system or sector are when the user sends data, insert Bit Interleave between coding and modulated process, different interlacing patterns is adopted in different base stations or sector; The travelling carriage of cellular system is judged the interference signal intensity from one or several main cochannel interference source of adjacent base station or sector, some signal strength signal intensities of disturbing are greater than setting threshold, then carry out multi-user association and detect reception, use the different base station of interlacing pattern difference, if intensity less than setting thresholding, is then carried out single user and is received.
In the said method, the method of Bit Interleave is: in each base station or the sector when each travelling carriage sends data, between channel encoder and modulator, insert the Bit Interleave operation, adopt the specific interlacing pattern in this base station or sector to interweave to coded-bit.
Fig. 1 provided a frequency reuse be 2 cellular system as an example.In this example the whole available frequency bands of cellular system are labeled as F, it is divided into three frequency range that waits the non-overlapping copies of width: F1/F2/F3.Concrete frequency partition mode is referring to Fig. 1.As can be seen from Figure 1, because neighbor cell has been shared band segment, then the user of neighbor cell might shared same down channel, thereby cause adjacent sub-district cochannel to disturb, in this example, with two mobile station MSs 1 and the MS2 that lay respectively at two cell edges part is example, their shared same channels that is positioned at frequency range F1.Need to prove, clear with statement for convenience, here for example is two base stations and two travelling carriages, but this network does not limit the topology of quantity of unit (being the quantity of the number of adjacent base station and the travelling carriage of being served thereof) and unit (be the relative position of adjacent base station, and the number and the orientation that certain travelling carriage are caused the adjacent cell base station of interference).
Fig. 2 is the mobile station MS 1 of two shared same channels among Fig. 1 and the schematic diagram of MS2 and the base station BS 1/BS2 under them, comprises the schematic diagram of two employed down channels of travelling carriage.As can be seen from the figure, same frequency range that mobile station MS 1 and MS2 are shared is as down channel, thereby caused cochannel each other to disturb.
Fig. 3 is the processing procedure that base station BS 1 sends data among Fig. 2 to the mobile station MS 1 of being served.In this process, the data that need transmit to MS1 are at first through a channel encoder, the coded identification that obtains is sent into the superfine interleaver of the specific encoding ratio in base station then again through a spread spectrum and scrambling unit, sends into the generation of modulation and carrier multiplication unit after interweaving and transmits.Equally, base station BS 2 is identical to the delivery plan that the own mobile station MS of being served 2 transmits data, repeats no more.
The basic characteristics of this delivery plan just are the front end in data-modulated, have added a bit interleaver, and the interlacing pattern of this interleaver is determined by the base station, that is to say that in this figure, BS1 is different with the employed interlacing pattern of BS2.In addition, other unit is not restrictive.For example, if what this system adopted is the CDMA access mode, need pass through the spectrum-spreading and scrambling unit through the symbol behind the channel encoder, if but adopt other access way (for example TDMA/FDMA mode), might not need the spectrum-spreading and scrambling unit, same, if employing is the access mode of IFDMA, may also need one to cut general repetition (chip-repetition) unit in the spectrum-spreading unit back, and then the specific interleaver of access base station.Equally, through behind the interleaver, the Signal Processing unit neither be limited by Fig. 3, and Fig. 3 has just provided the example of a single-carrier system, if this system applies is on the OFDM platform, the bit symbol after interweaving also needs through a series of OFDM modulating units such as subcarrier mapping and modulation.
Generally speaking, Fig. 3 is the delivery plan of travelling carriage of oneself service as the base station, and basic characteristics just are that adjacent base station shares same time frequency unit, and the specific coded-bit interleaver of modulator front end increase simultaneously comes distinguishing cell by interlacing pattern.And without limits for concrete access mode and modulation system.
Fig. 4 is when travelling carriage BS1 receives from signal of base station among Fig. 2, the flow chart of the decision process process of being done.Travelling carriage can switch between two kinds of reception programmes (single user's detection/multi-user association detects).The standard of switching is from the control information (this control information can be sent by the base station, also can be judged voluntarily by travelling carriage) about adjacent sub-district cochannel interference strength.
Fig. 5 is the structural representation that single user detects among Fig. 4, when the close center of housing estate of travelling carriage, when perhaps travelling carriage is arranged in an isolated environment (for example focus environment or indoor environment), cochannel from adjacent sub-district disturbs less, this moment, travelling carriage can adopt this structure to receive, for the signal that obtains after the demodulation, directly it is carried out and the employed specific corresponding deinterleaving that interweaves of this cell base station, for example, the signal of MS1 after with demodulation sent into the corresponding deinterleaver of interleaver that uses with BS1, carry out operations such as despreading decoding then, the co-channel signal that adjacent sub-district (BS2) sends simply is used as the interference processing.
Fig. 6 is the structural representation that multi-user association detects among Fig. 4, and when the cochannel from adjacent sub-district disturbs when strong, travelling carriage adopts this structure to receive, and this structure to concrete multi-access mode and modulation system without limits.Each travelling carriage all detects the co-channel signal that all adjacent sub-districts send respectively, in this figure, just means that mobile station MS 1 all detects the source information that two base stations send, and keeps to send to own data flow.Because in the iterative detection process, adjacent sub-district cochannel disturbs and rebuiltly to come out and removed, rather than simply as noise processed, has therefore suppressed the cochannel interference intensity greatly.
It should be noted that these two kinds receive structures also to the quantity of concrete multi-access mode, interference and modulation system without limits.The basic structure of two reception programmes is:
Single user detects: with the single user matched filter reception programme of cochannel interference in adjacent sub-district as noise processed.
Multi-user association detects: the characteristics of utilizing the different interlacing pattern of use between the co-channel signal, iterative detection structure by the coding multi-user, adjacent sub-district co-channel signal and the useful signal of oneself are detected jointly, and preserve the reception programme of useful signal.
The example that provides in Fig. 1, the present invention can also combine with the Resource Management Algorithm of sectorization, directional antenna and high level in the sub-district, suppresses the influence that adjacent cell channel disturbs jointly.Wherein the sector dividing mode can adopt:
(1) use a multiangular center excited cells to be subdivided into N sector; Perhaps
(2) use a multiangular corner excited cells to be subdivided into N sector.
Different frequency ranges can be distributed with the sector in different base stations, also can share all or part of frequency range.
Certain Resource Management Algorithm can be used in the base station simultaneously, according to certain optimization criterion channel is distributed, and guarantees that the travelling carriage of the close together of neighbor cell is not shared identical channel, to suppress the influence that cochannel disturbs.
The base station also can use directional antenna that travelling carriage is carried out transfer of data, directional antenna can be adjusted the deflection of wave beam, make it to point to current travelling carriage of serving reducing the interference that other user is caused, travelling carriage can use omnidirectional or directional antenna to receive to reduce other user to its interference that causes.
Fig. 7 is the technology principle of combining schematic diagram with the present invention and directional antenna differentiation sector.With angle of distribution is that to encourage the antenna structure of three sectors be example the centers of 120 degree, and the spendable bandwidth that system is total is divided into three frequency range: F1/F2/F3, and the frequency allocation plan of whole system as shown in the figure.As can be seen from the figure, use such directional antenna and frequency spectrum distributing method, travelling carriage also adopts certain directional antenna to make the peak value of received signal point to the respective antenna of home base stations simultaneously, can guarantee that the suffered cochannel of user only disturbs by non-conterminous sub-district is produced (though for example MS1 and MS3 are the user and the shared same frequency range of neighbor cell, also can not cause the phase mutual interference).
Simultaneously, the influence of disturbing for the cochannel of taking said method still to fail to eliminate fully (interference that the down channel that the MS1 among the figure uses causes for the reception of MS2), adopt method of the present invention further to suppress, transmitting terminal uses different interlacing pattern distinguishing cells, mobile station side adopts single receiver user or Multiuser Detection scheme to detect reception according to the power of disturbing.The description of concrete details reference Fig. 1-Fig. 6 that sends and receive.
The radical that the present invention and combining of above-mentioned technology are not stipulated the base station configuration directional antenna, azimuthal setting of directional antenna and concrete frequency spectrum, method for channel allocation or the like.
Claims (4)
1, a kind of method that is used for the descending cochannel interference of inhibition adjacent cell of wireless cellular network is characterized in that this method comprises the steps:
(1) Bit Interleave is inserted in each base station in the cellular system or sector between coding and modulated process when the user sends data, and different interlacing patterns is adopted in different base stations or sector;
(2) travelling carriage of cellular system is judged the interference signal intensity from one or several main cochannel interference source of adjacent base station or sector, some signal strength signal intensities of disturbing are greater than setting threshold, then carry out multi-user association and detect reception, use the different base station of interlacing pattern difference, if intensity less than setting thresholding, is then carried out single user and is received.
2, the method for claim 1, the method that it is characterized in that wherein said Bit Interleave is: in each base station or the sector when each travelling carriage sends data, between channel encoder and modulator, the operation of insertion Bit Interleave adopts the specific interlacing pattern in this base station or sector to interweave to coded-bit.
3, the method for claim 1 is characterized in that the method that wherein said multi-user association detects may further comprise the steps:
(1) travelling carriage of cellular system receives the signal from base station or sector, after carrier wave demodulation and data demodulates, carry out Multiuser Detection according to the co-channel signal of the signal, the characteristic of channel, adjacent base station or the sector that receive and the data flow of following step (4) output, obtain sending the posteriority likelihood ratio of coded-bit in the signal;
(2) above-mentioned posteriority likelihood ratio is carried out the corresponding bit deinterleaving of Bit Interleave used when sending with affiliated data flow;
(3) data flow that obtains according to above-mentioned bit deinterleaving, the corresponding channel decoding of using when carrying out of chnnel coding, and the posteriority likelihood ratio of the preceding data of delivery channel coding with this data flow transmission;
(4) with the posteriority likelihood ratio of data before the above-mentioned chnnel coding according to data flow under it, carry out chnnel coding and Bit Interleave identical when sending with this data flow, the data flow that obtains is sent in the Multiuser Detection process of step (1);
(5) adjudicate according to the posteriority likelihood ratio of the data that step (3) is obtained repeating step (1)～(4), obtains the data flow that travelling carriage needs.
4, the method for claim 1 is characterized in that wherein said single user's detection method may further comprise the steps:
(1) travelling carriage of cellular system receives the signal of base station or sector, after carrier wave demodulation and data demodulates, pick the needed data flow of this travelling carriage by matched filtering, and will share the interference signal of same frequency range or time frequency unit as noise processed with this travelling carriage;
(2) according to the needed data flow of this travelling carriage that detects after the above-mentioned matched filtering, corresponding channel decoding of Bit Interleave, chnnel coding and the bit deinterleaving used when carrying out respectively, and judgement dateout with this data flow transmission.
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| WO2009067919A1 (en) * | 2007-11-12 | 2009-06-04 | Huawei Technologies Co., Ltd. | Data transmitting/receiving method and device in mimo system |
| CN101442752B (en) * | 2007-11-21 | 2010-11-03 | 上海贝尔阿尔卡特股份有限公司 | Method and apparatus for controlling interference between neighboring districts in base station and user terminal |
| CN101951275A (en) * | 2010-09-29 | 2011-01-19 | 山东大学 | Cell co-frequency networking method combining IDMA and OVCDMA |
| CN101969357A (en) * | 2010-09-29 | 2011-02-09 | 山东大学 | Cell same-frequency networking system combining interleave division multiple access (IDMA) and overlapped code division multiple access (OVCDMA) and method thereof |
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| CN101518114B (en) * | 2006-09-20 | 2012-03-21 | 日本电气株式会社 | Carrier assignment method for cellular system, cellular system, base station, and mobile station |
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| US8548027B2 (en) | 2007-11-02 | 2013-10-01 | Huawei Technologies Co., Ltd. | Multi-ary error-correcting code transmitting and receiving apparatuse, data transmission system, and relevant method |
| WO2009067919A1 (en) * | 2007-11-12 | 2009-06-04 | Huawei Technologies Co., Ltd. | Data transmitting/receiving method and device in mimo system |
| CN101442752B (en) * | 2007-11-21 | 2010-11-03 | 上海贝尔阿尔卡特股份有限公司 | Method and apparatus for controlling interference between neighboring districts in base station and user terminal |
| CN101969357A (en) * | 2010-09-29 | 2011-02-09 | 山东大学 | Cell same-frequency networking system combining interleave division multiple access (IDMA) and overlapped code division multiple access (OVCDMA) and method thereof |
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| CN102223685A (en) * | 2011-06-08 | 2011-10-19 | 中国人民解放军国防科学技术大学 | Admission control method in multi-hop wireless network |
| CN102223685B (en) * | 2011-06-08 | 2013-06-12 | 中国人民解放军国防科学技术大学 | Admission control method in multi-hop wireless network |
| CN105281864A (en) * | 2014-05-30 | 2016-01-27 | 华为技术有限公司 | Data transmission method and device |
| CN105281864B (en) * | 2014-05-30 | 2018-10-19 | 华为技术有限公司 | A kind of data transmission method and device |
| CN108462551A (en) * | 2017-02-17 | 2018-08-28 | 瑞昱半导体股份有限公司 | Demodulation method and reception device |
| CN108462551B (en) * | 2017-02-17 | 2020-10-23 | 瑞昱半导体股份有限公司 | Demodulation method and receiving apparatus |
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