CN107017928B - Preprocessing method for suppressing cross polarization interference based on oblique projection - Google Patents
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- 238000005388 cross polarization Methods 0.000 title claims abstract description 22
- 238000007781 pre-processing Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000010287 polarization Effects 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000001629 suppression Effects 0.000 claims abstract description 5
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- 230000000295 complement effect Effects 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 abstract description 5
- 235000009566 rice Nutrition 0.000 abstract description 5
- 238000005562 fading Methods 0.000 abstract description 4
- 230000011664 signaling Effects 0.000 abstract description 2
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 241000209094 Oryza Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
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Abstract
The invention provides a preprocessing method for suppressing cross polarization interference based on oblique projection, which comprises the following steps: A. determining channel state information at a transmitting end; B. b, establishing an oblique projection operator corresponding to the same polarization channel according to the channel state information in the step A; C. preprocessing a transmission signal by adopting the oblique projection operator, and inhibiting and eliminating cross polarization component interference; D. and sending the preprocessed information. In a large-scale antenna application scenario, due to the large number of antennas at the base station end, the terminal may not be able to completely obtain channel state information, or signaling overhead and computational complexity are too complex, but at this time, the precoding processing of the present invention can be performed in the base station to achieve suppression of interference signals, and high multiplexing gain is achieved on the premise of ensuring high diversity gain. The method of the invention obviously improves the Symbol Error Rate (SER) performance of the whole dual-polarization MIMO system under the condition of Rayleigh fading channel or Rice fading channel.
Description
Technical Field
The invention belongs to the technical field of signal processing, and particularly relates to an oblique projection technology utilizing a channel and a preprocessing method for preprocessing a polarization signal.
Background
In the transmission process of the dual-polarization MIMO system, cross polarization interference is often introduced due to the depolarization effect, that is, signals transmitted by the vertical polarization antenna at the transmitting end are also received by the horizontal polarization antenna at the receiving end, and in the same way, signals transmitted by the horizontal polarization antenna at the transmitting end are also received by the vertical polarization antenna. The conventional method for suppressing cross polarization interference is often implemented by hardware, that is, by designing an array structure of antennas, which often has high limitation requirements for specific application scenarios.
For example, patent document 1 (chinese patent publication No. CN104125180A) discloses a self-interference cancellation method for time-frequency domain and polarization domain processing cascade in full-duplex communication, which includes: the receiving end carries out radio frequency self-interference elimination of a time-frequency domain; the polarized signal after being eliminated by the radio frequency self-interference reaches a baseband through down-conversion, and an oblique projection polarization filtering operator is constructed according to the prior self-interference polarization state and the expected signal polarization state to carry out polarization filtering; and carrying out matched reception of the expected signal according to the principle that the output signal-to-interference-and-noise ratio is maximum. However, in the scheme, the implementation of the decoding process of the receiving end on the interference cancellation effect of the polarization filtering operator depends on the prior interference and the polarization state information of the desired signal to a great extent, and the polarization state information cannot be directly applied to the precoding process of the transmitting end simply. Moreover, this scheme is not suitable for large-scale antenna application scenarios.
Disclosure of Invention
The invention constructs the oblique projection operator of the same polarization channel by utilizing the channel state information acquired at the transmitting end, thereby effectively realizing the inhibition effect on the cross polarization interference component by the algorithm for preprocessing the transmitted signal.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preprocessing method for suppressing cross polarization interference based on oblique projection comprises the following steps:
a: determining channel state information at a transmitting end;
b: b, establishing an oblique projection operator corresponding to the same polarization channel according to the channel state information in the step A;
c: b, preprocessing a sending signal by the oblique projection operator obtained in the step B, and inhibiting and eliminating cross polarization component interference;
wherein, the channel state information in the step A comprises respectively using H in the dual-polarized MIMO systemVV、HVH、HHH、HHVCorrespondingly representing channel state information transmitted from the vertically polarized antenna to the vertically polarized antenna for receiving, transmitted from the horizontally polarized antenna to the horizontally polarized antenna for receiving and transmitted from the vertically polarized antenna to the horizontally polarized antenna for receiving;
the target channel in the step B is a same polarization transmission channel HVVAnd HHH，HVVCorresponding oblique projection operator
Wherein,
representing cross-polarized channel HHVOrthogonal complementary projection of; hHHCorresponding oblique projection operator
Representing cross-polarized channel HVHOrthogonal complementary projection of;
is Nt×NtIdentity matrix of NtThe number of transmit antennas.
The further technical scheme of the invention is as follows: in the step C, a signal C is sentVAnd CHRespectively representing the information originally transmitted by the vertically polarized antenna and the horizontally polarized antenna, and correspondingly converted into P after corresponding pretreatmentVCVAnd PHCH。
The further technical scheme of the invention is as follows: the preprocessing operation is performed in a dual-polarization MIMO system transmission model
The suppression effect of the interference of the cross polarization component is represented as follows:
RV＝HVVPVCV+HVHPHCH+NV＝HVVCV+NV，
RH＝HHVPVCV+HHHPHCH+NH＝HHHCH+NH，
wherein R isVAnd RHRespectively representing the signals received at the receiving end by the vertically and horizontally polarized antennas, NVAnd NHRespectively representing noise interference for a vertically polarized antenna and a horizontally polarized antenna of a receiving end. Therefore, the invention effectively inhibits the cross polarization component interference brought by the cross polarization channel.
The further technical scheme of the invention is as follows: the method further comprises a step D: and sending the preprocessed information.
The invention has the technical effects that: the method of the invention depends on the state information of the channel in the preprocessing process of the transmitting terminal, thereby constructing a corresponding oblique projection operator. In a large-scale antenna application scenario, due to the large number of antennas at the base station end, the terminal may not be able to completely obtain channel state information, or signaling overhead and computational complexity are too complex, but at this time, the precoding processing of the present invention can be performed in the base station to achieve suppression of interference signals, and high multiplexing gain is achieved on the premise of ensuring high diversity gain. The method of the invention obviously improves the Symbol Error Rate (SER) performance of the whole dual-polarization MIMO system under the condition of Rayleigh fading channel or Rice fading channel.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a graph comparing pre-treatment and non-pre-treatment performance simulations.
Detailed Description
The technical solution of the present invention is further illustrated below with reference to specific examples.
As shown in fig. 1, the pre-processing method for suppressing cross polarization interference based on oblique projection of the present invention includes the following steps:
a: determining channel state information at a transmitting end;
b: b, establishing an oblique projection operator corresponding to the same polarization channel according to the channel state information in the step A;
c: b, obtaining an oblique projection operator in the step B, preprocessing a sending signal, and inhibiting and eliminating cross polarization component interference;
d: and sending the preprocessed information.
Wherein, the channel state information in step a may include separately using H in a dual-polarization MIMO systemVV，HVH，HHH，HHVCorrespondingly, the channel state information is transmitted from the vertically polarized antenna to the vertically polarized antenna for receiving, transmitted from the horizontally polarized antenna to the horizontally polarized antenna for receiving and transmitted from the vertically polarized antenna to the horizontally polarized antenna for receiving.
The target channel in the step B is a same polarization transmission channel HVVAnd HHH，HVVThe corresponding oblique projection operator is
Wherein,
representing cross-polarized channel HHVOrthogonal complementary projection of; hHHThe corresponding oblique projection operator is
Representing cross-polarized channel HVHOrthogonal complementary projection of.
Is Nt×NtIdentity matrix of NtThe number of transmit antennas.
In the step C, a signal C is sentVAnd CHRespectively representing the information originally transmitted by the vertically polarized antenna and the horizontally polarized antenna, and correspondingly converted into P after corresponding pretreatmentVCVAnd PHCH. The preprocessing operation is performed in a dual-polarization MIMO system transmission model
The suppression effect of the interference of the cross polarization component is shown as follows:
RV＝HVVPVCV+HVHPHCH+NV＝HVVCV+NV，
RH＝HHVPVCV+HHHPHCH+NH＝HHHCH+NH，
wherein R isVAnd RHRespectively representing the signals received at the receiving end by the vertically and horizontally polarized antennas, NVAnd NHRespectively representing noise interference for a vertically polarized antenna and a horizontally polarized antenna of a receiving end. Therefore, the invention effectively inhibits the cross polarization component interference brought by the cross polarization channel.
The beneficial effects achieved by the present invention can be shown in fig. 2, which is a comparative simulation diagram of preprocessing and non-preprocessing performed on a 2 × 1 dual-polarization MIMO transmission system under the conditions of a rayleigh channel and a rice channel (rice factor K is 2), wherein 2 vertical polarization transmitting antennas and 2 horizontal polarization transmitting antennas respectively adopt Alamouti orthogonal space-time block codes, that is:
from fig. 2, it can be seen that the pre-processing algorithm of the present invention significantly improves the SER performance of the whole system, whether under the rayleigh channel or under the rice channel condition.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (2)
1. A preprocessing method for suppressing cross polarization interference based on oblique projection is characterized by comprising the following steps:
a: determining channel state information at a transmitting end;
b: b, establishing an oblique projection operator corresponding to the same polarization channel according to the channel state information in the step A;
c: b, preprocessing a sending signal by the oblique projection operator obtained in the step B, and inhibiting and eliminating cross polarization component interference;
wherein, the channel state information in the step A comprises respectively using H in the dual-polarized MIMO systemVV、HVH、HHH、HHVCorrespondingly representing channel state information transmitted from the vertically polarized antenna to the vertically polarized antenna for receiving, transmitted from the horizontally polarized antenna to the horizontally polarized antenna for receiving and transmitted from the vertically polarized antenna to the horizontally polarized antenna for receiving;
the channel state information in the step B is a same polarization transmission channel HVVAnd HHH，HVVCorresponding oblique projection operator
Wherein,
representing cross-polarized channel HHVOrthogonal complementary projection of; hHHCorresponding oblique projection operator
Representing cross-polarized channel HVHOrthogonal complementary projection of;
is Nt×NtIdentity matrix of NtThe number of transmitting antennas;
the step C of sending signals comprises CVAnd CHRespectively representing the information originally transmitted by the vertically polarized antenna and the horizontally polarized antenna, and correspondingly converted into P after corresponding preprocessingVCVAnd PHCH；
The preprocessing operation is performed in a dual-polarization MIMO system transmission model
The suppression effect of the interference of the cross polarization component is represented as follows:
RV＝HVVPVCV+HVHPHCH+NV＝HVVCV+NV，
RH＝HHVPVCV+HHHPHCH+NH＝HHHCH+NH，
wherein R isVAnd RHRespectively representing the signals received at the receiving end by the vertically and horizontally polarized antennas, NVAnd NHThe noise interference to the vertical polarization antenna and the horizontal polarization antenna of the receiving end is respectively shown, and the cross polarization component interference brought by the cross polarization channel is effectively inhibited.
2. The method of claim 1, wherein: the method further comprises a step D: and sending the preprocessed information.
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| CN108880643B (en) * | 2018-05-30 | 2021-03-23 | 哈尔滨工业大学深圳研究生院 | Large-scale MIMO-NOMA downlink interference elimination method based on oblique projection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101568174A (en) * | 2008-04-24 | 2009-10-28 | 阿尔卡特朗讯 | Method for reducing interference in a radio network equipment and equipment performing the method |
| CN101820097A (en) * | 2009-01-14 | 2010-09-01 | 莱尔德技术股份有限公司 | Dual-polarized antenna modules |
| CN101917218A (en) * | 2010-08-06 | 2010-12-15 | 上海电机学院 | MIMO multi-user system downlink transmission method and system for reducing feedback information |
| US9525475B1 (en) * | 2015-09-14 | 2016-12-20 | Facebook, Inc. | Adaptive dual polarized MIMO for dynamically moving transmitter and receiver |
| CN106452530A (en) * | 2016-10-25 | 2017-02-22 | 北京邮电大学 | Method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under influence of power amplifier nonlinearity based on polarized oblique projection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101568174A (en) * | 2008-04-24 | 2009-10-28 | 阿尔卡特朗讯 | Method for reducing interference in a radio network equipment and equipment performing the method |
| CN101820097A (en) * | 2009-01-14 | 2010-09-01 | 莱尔德技术股份有限公司 | Dual-polarized antenna modules |
| CN101917218A (en) * | 2010-08-06 | 2010-12-15 | 上海电机学院 | MIMO multi-user system downlink transmission method and system for reducing feedback information |
| US9525475B1 (en) * | 2015-09-14 | 2016-12-20 | Facebook, Inc. | Adaptive dual polarized MIMO for dynamically moving transmitter and receiver |
| CN106452530A (en) * | 2016-10-25 | 2017-02-22 | 北京邮电大学 | Method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under influence of power amplifier nonlinearity based on polarized oblique projection |
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