CN112672416A - Timing synchronization method and device in passive intermodulation interference cancellation - Google Patents
Timing synchronization method and device in passive intermodulation interference cancellation Download PDFInfo
- Publication number
- CN112672416A CN112672416A CN202011582708.4A CN202011582708A CN112672416A CN 112672416 A CN112672416 A CN 112672416A CN 202011582708 A CN202011582708 A CN 202011582708A CN 112672416 A CN112672416 A CN 112672416A
- Authority
- CN
- China
- Prior art keywords
- intermodulation
- signal
- signals
- uplink
- determining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004891 communication Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 238000009499 grossing Methods 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000004422 calculation algorithm Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 101001001645 Homo sapiens Serine/threonine-protein kinase pim-3 Proteins 0.000 description 1
- 102100036119 Serine/threonine-protein kinase pim-3 Human genes 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Landscapes
- Noise Elimination (AREA)
Abstract
The embodiment of the invention relates to the technical field of communication, in particular to a technical scheme for improving nonlinear influence of an antenna and an antenna feed system by a receiver at a wireless communication base station side. More specifically, the method determines the timing position of the PIM interference signal in the uplink received signal by determining the correlation between intermodulation products generated by time domain information of the M downlink transmission signals and the uplink received signal through the relationship between the PIM interference signal and the M downlink signals in the uplink received signal, that is, the PIM interference signal is generated by the M downlink transmission signals, thereby determining the timing relationship.
Description
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a timing synchronization method and a timing synchronization device in passive intermodulation interference cancellation.
Background
In a wireless communication system, especially in the deployment of a wireless communication base station, as the antenna density in a station increases, a need for combining and deploying a plurality of antennas sharing an antenna feeder and a radio frequency channel arises, so that Passive Inter-Modulation (PIM) interference generated becomes an important factor for limiting system capacity and preventing multiplexing of co-station devices. Passive intermodulation in wireless communication systems is caused by the non-linear characteristics of various passive devices (e.g., duplexers, antennas, feed lines, rf line connectors, etc.) in the transmit system. In a transmitter system of wireless communication, due to the high power characteristic, the nonlinear effect of a conventional passive device is highlighted, thereby generating an unexpected interference of a new set of frequencies such as (PIM3, PIM5, PIM7 …) outside the spectrum of an expected transmission signal, or generating a spurious signal-passive intermodulation, if these spurious PIM signals fall within a receiving frequency band, and considering that the strength of a signal at a transmitting end of an FDD system (and its associated interworking derivative signal) is generally much greater than that of a signal at a receiving end, the spurious signals will cause interference to a normal receiver, so that the sensitivity of the receiver is reduced, the uplink throughput and the cell coverage of a radio frequency module are affected, and further the system capacity of the wireless communication system is reduced.
In the passive intermodulation system, the time alignment of the cancellation signal and the uplink receiving signal is also an important step in the passive intermodulation PIM interference cancellation, which needs to be accurate to the sample point level, the prior art determines the timing error by a (complex) correlation of the intermodulation product constructed in real time and the time delay of the corresponding component in the uplink signal, so as to align the time of the uplink receiving signal and the downlink transmission according to the timing error, further realize the time alignment of the cancellation signal and the uplink receiving signal, the scheme generally selects an intermodulation product construction method off-line according to experience, and a situation that the fixed construction scheme selected off-line is difficult to adapt to different hardware characteristics in practical application occurs (namely, the selected construction scheme may be suitable for the equipment A, but not suitable for the equipment B with the hardware physical characteristics in and out, because for the equipment B, another construction scheme is dominant).
Disclosure of Invention
The embodiment of the invention aims to provide a timing synchronization method and a timing synchronization device in passive intermodulation interference cancellation, and solves the problems of large data processing capacity and complex implementation process of the timing synchronization method in PIM interference cancellation in the prior art.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a timing synchronization method in passive intermodulation interference cancellation, including:
acquiring M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
performing nonlinear combination on the time domain information of the M downlink transmitting signals to generate intermodulation products;
determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal.
In a second aspect, an embodiment of the present invention provides a timing synchronization apparatus in passive intermodulation interference cancellation, including:
the signal acquisition module is used for acquiring M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
a component generating module, configured to perform nonlinear combination on the time domain information of the M downlink transmitting signals to generate intermodulation components;
and the timing synchronization module is used for determining the timing position of the PIM interference signal in the uplink receiving signal according to the intermodulation product and the correlation value of the uplink receiving signal.
In a third aspect, an embodiment of the present invention provides a communication system, including:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the passive intermodulation interference cancellation timing synchronization method according to an embodiment of the first aspect of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the passive intermodulation interference cancellation timing synchronization method according to the embodiment of the first aspect of the present invention.
Compared with the prior art, the embodiment of the invention determines the timing position of the PIM interference signal in the uplink receiving signal by determining the correlation between the intermodulation component generated by the time domain information of the M downlink transmitting signals and the uplink receiving signal through the relationship between the PIM interference signal in the uplink receiving signal and the M downlink signals, namely the PIM interference signal is generated by the M downlink transmitting signals.
In addition, the performing nonlinear combination on the time domain information of the M downlink transmission signals to generate intermodulation products specifically includes:
acquiring M sampling points corresponding to the M downlink transmitting signals at the same time, and determining a component element set according to the M sampling points;
and generating N intermodulation products according to the component element set, wherein the intermodulation products are obtained by carrying out nonlinear combination on at least two component elements in the component element set.
In addition, the determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal specifically includes:
selecting an intermodulation product which is most intersected with the frequency band of the uplink receiving signal as a main intermodulation product;
carrying out correlation calculation on the main intermodulation product and the uplink receiving signal to obtain a correlation sequence representing the correlation value of the uplink receiving signal and the intermodulation product;
and determining the position and amplitude corresponding to the maximum value in the correlation sequence, and determining the timing position of the PIM interference signal in the uplink received signal according to the position and amplitude.
In addition, after determining the position and amplitude corresponding to the maximum value in each correlation sequence, the method further includes:
abnormal value detection is carried out on the position and the amplitude corresponding to each intermodulation component, and abnormal values are screened out;
and carrying out smoothing processing on the data output after the abnormal value detection according to the smoothing filter.
In addition, the determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal specifically includes:
performing correlation calculation on each intermodulation component and the uplink receiving signal to obtain a correlation sequence representing correlation values of the uplink receiving signal and each intermodulation component;
determining the position and amplitude corresponding to the maximum value in each correlation sequence;
and performing arithmetic average or weighted average processing on the position and amplitude corresponding to each intermodulation component, and determining the timing position of the PIM interference signal in the uplink received signal according to the position and amplitude after the arithmetic average or weighted average processing.
In addition, after determining the timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal, the method further includes:
obtaining a time domain estimation value of a PIM interference signal according to the timing position, the N intermodulation products and N coefficients which are determined by the uplink receiving signal and respectively correspond to the N intermodulation products, and the N intermodulation products;
and canceling the PIM interference signal based on the time domain estimation value.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a flow chart of a method for timing synchronization in passive intermodulation interference cancellation according to an embodiment of the present invention;
fig. 2 is a flow chart of the main intermodulation product determination timing location according to an embodiment of the present invention;
fig. 3 is a flow chart of all intermodulation product determination timing positions according to an embodiment of the present invention;
fig. 4 is a block diagram of a communication system according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
The terms "first" and "second" in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "comprise" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a system, product or apparatus that comprises a list of elements or components is not limited to only those elements or components but may alternatively include other elements or components not expressly listed or inherent to such product or apparatus. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.
The intermodulation interference cancellation logic mainly comprises three parts of basic component generation, timing synchronization and system identification and solving, wherein the basic component generation is to generate a corresponding nonlinear component, namely an intermodulation component, from a known downlink transmitting signal, the timing synchronization is to determine the precise timing synchronization relationship between a cancellation signal and an uplink receiving signal, and the precise timing synchronization relationship needs to be in a sampling point level, the system identification and solving is to carry out the system identification and solving according to a PIM interference signal and each component after the timing synchronization relationship is obtained, and the part can be divided into an orthogonal component and a non-orthogonal component, such as the non-orthogonal component adopted by a scheme based on a Volterra series.
Take the example of intermodulation generation of two signals, Baseband Signal a and Baseband Signal B, where a and B represent the downstream signals of two carriers, which are fully expressed as a (t) and B (t), where the signals are zero-frequency (complex) Baseband signals.
The Receiving Signal Y is a target Receiving Signal, and corresponds to an uplink in a communication system, and in this embodiment, refers to an uplink Receiving Signal with a PIM interference Signal, which is completely expressed as Y (t), and is also a (complex) baseband Signal with zero frequency.
In the timing synchronization part, time sequence logic needs to be acquired, namely, according to A (t)/B (t)/Y (t), the timing synchronization relation of the interference part signal (PIM interference signal) in Y is searched.
The scheme of the embodiment of the invention is that the timing position of the PIM interference signal in the uplink receiving signal is determined by determining the correlation between the intermodulation product generated by the time domain information of the downlink transmitting signal and the uplink receiving signal according to the relation between the PIM interference signal in the uplink receiving signal and the downlink signal, the implementation mode is simple and direct, and the method is suitable for cancellation processing of any receiving terminal nonlinear interference source. The following description and description will proceed with reference being made to various embodiments.
A first embodiment of the present invention relates to a timing synchronization method in passive intermodulation interference cancellation, as shown in fig. 1, including:
step S1, obtaining M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
specifically, in this embodiment, the uplink received signal and the M downlink transmitted signals are both time functions.
Step S2, carrying out nonlinear combination on the time domain information of the M downlink transmitting signals to generate intermodulation products;
specifically, in this embodiment, the conjugates of the M sampling points are determined by obtaining M sampling points corresponding to the M downlink transmission signals at the same time, and a component element set is formed according to the M sampling points and the conjugates of the M sampling points;
and then carrying out nonlinear combination on at least two component elements in the component element set to generate N intermodulation components, wherein the operation mode of the nonlinear combination comprises multiplication, exponential operation, trigonometric function operation, complex modulus value, conjugate complex number and the like.
In addition to the above method of this embodiment, an existing component generator may be utilized, for example, the input two downlink transmission signals are a (t)/b (t), the component generator constructs a time-domain intermodulation component according to the input a (t)/b (t) time-domain signal, and the output may be denoted as C1(t)/C2(t)/C3(t)/C4(t)/.
Step S3, determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal.
Specifically, because the PIM interference signal is formed by combining intermodulation products, the timing position of the PIM interference signal in the uplink receiving signal can be determined by determining the correlation between the intermodulation products generated by the time domain information of the M downlink transmitting signals and the uplink receiving signal, and the implementation method is simple and direct, and is suitable for cancellation processing of any receiving-end nonlinear interference source.
For example, for an element A (k) in A (t), for an element B (k) in B (t); k is a time tag;
at this time, c (k) is a (k) × conj (b (k)) or
C (k) x a (k) x conj (b (k)) x b (k) or
C (k) x a (k) x conj (b (k)) x a (k) or
C(k)＝A(k)×A(k)×conj(B(k))×|A(k)|×|B(k)|
Wherein conj is a complex conjugate algorithm, and | x | represents a module value of the complex number.
On the basis of the foregoing embodiment, as a preferred implementation manner, the determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal specifically includes:
selecting an intermodulation product which has the most intersection with the frequency band of the uplink receiving signal as a main intermodulation product through actual measurement or simulation analysis;
carrying out correlation calculation on the main intermodulation product and the uplink receiving signal to obtain a correlation sequence representing the correlation value of the uplink receiving signal and the intermodulation product;
if the complex vector x and the complex vector y are present, the correlation is calculated as x and conj (y), and then accumulated, the offset is simply to shift x in the time direction.
And determining the position and amplitude corresponding to the maximum value in the correlation sequence, and determining the timing position of the PIM interference signal in the uplink received signal according to the position and amplitude.
As shown in fig. 2, taking two input downlink transmission signals as a (T)/b (T) as an example, a time-domain intermodulation component is constructed by a component generator, and then a single component is selected as a main intermodulation component, in this embodiment, an intermodulation component which intersects with a frequency band of the uplink reception signal most is taken as a main intermodulation component, correlation calculation is performed on the main intermodulation component and the uplink reception signal y (T), a correlation value between the main intermodulation component and the uplink reception signal is obtained, an accurate timing position is determined according to the maximum correlation value, and output is deltaT (or Δ T), which means an offset sampling point number.
Specifically, the position needs to be determined, the correlation sequence is traversed, the element with the maximum modulus is taken out, and the modulus value and the position can be obtained; secondly, a plurality of positions need to be merged, and assuming that the positions are p (0), p (1), p (2), …, p (N-1), and the corresponding modulus values are a (0), a (1), a (2), …, a (N-1), the position estimation can be:
[ p (0) + p (1) + p (2) + … + p (N-1) ]/N or
[a(0)p(0),a(1)p(1),a(2)p(2),…,a(N-1)p(N-1)]/[a(0)+a(1)+a(2)+…+a(N-1)]。
In addition to the above-described embodiments, as a preferred embodiment, the output timing position result is subjected to abnormal value detection and smoothing filtering to remove abnormal values and remove noise, thereby achieving smoothing and averaging effects, and specifically, an alpha-beta filter or a moving average filter may be used for filtering processing.
Since the actual PIM interference signal is a combination of multiple components, the correlation value of a single component may not be large enough for a particular application, and selecting a single component may cause particular hardware-related adaptation problems, such as finding the most effective primary component on a particular device a, which may not be as effective as placing it on another device B.
Therefore, on the basis of the above-mentioned embodiment, as a preferred implementation, when determining the timing position of the PIM interference signal in the uplink received signal according to the correlation values of the intermodulation product and the uplink received signal, instead of selecting a single intermodulation product to perform correlation calculation, performing correlation calculation on each intermodulation product and the uplink received signal, as shown in fig. 3, in the correlation calculation, a sequence formed by the intermodulation product and the uplink received signal is input, an output of the correlation calculation is an absolute value of a complex correlation sequence, a maximum value is taken for each sequence, and finally, a position and an amplitude (i.e., deltaT) corresponding to the maximum value are obtained; combining the position and amplitude obtained by each intermodulation component to obtain an array of the position and amplitude, carrying out anomaly detection on the array of the position and amplitude, removing an abnormal value in the array of the position and amplitude,and the residual values are combined, and the combination and the weighted average processing can be carried out through arithmetic average combination and weighted average processing, such as: Δ T mean (Δ T)0，ΔT0，ΔT1，ΔT2，…，ΔTN-1)。
On the basis of the foregoing embodiment, as a preferred implementation manner, after determining the timing position of the PIM interference signal in the uplink received signal according to the correlation value between the intermodulation product and the uplink received signal, the method further includes:
obtaining time domain estimation values of PIM interference signals according to the N coefficients respectively corresponding to the N intermodulation products (C1(t)/C2(t)/C3(t)/C4 (t)/.) determined by the timing position, the N intermodulation products and the uplink received signals;
and canceling the PIM interference signal based on the time domain estimation value.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
The second embodiment of the present invention relates to a timing synchronization apparatus in passive intermodulation interference cancellation, based on the timing synchronization method in passive intermodulation interference cancellation in the first embodiment of the present invention, including:
the signal acquisition module is used for acquiring M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
a component generating module, configured to perform nonlinear combination on the time domain information of the M downlink transmitting signals to generate intermodulation components;
and the timing synchronization module is used for determining the timing position of the PIM interference signal in the uplink receiving signal according to the intermodulation product and the correlation value of the uplink receiving signal.
A third embodiment of the present invention relates to a communication system, as shown in fig. 4, the communication system includes a processor (processor)810, a communication Interface (Communications Interface)820, a memory (memory)830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may invoke logic instructions in the memory 830 to perform the steps of the method for timing synchronization in passive intermodulation interference cancellation as described in the various embodiments above. Examples include:
acquiring M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
performing nonlinear combination on the time domain information of the M downlink transmitting signals to generate intermodulation products;
determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal.
Where the memory and processor are connected by a communications bus, which may include any number of interconnected buses and bridges, connecting together the various circuits of the memory and one or more processors. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between a communication bus and a transceiver. The transceiver may be one element or a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor is transmitted over a wireless medium via an antenna, which further receives the data and transmits the data to the processor.
The processor is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And the memory may be used to store data used by the processor in performing operations.
The technical scheme of the embodiment of the invention can be applied to various communication systems, such as: global System for Mobile Communications (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) systems, General Packet Radio Service (GPRS), LTE systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD), Universal Mobile Telecommunications System (UMTS), and the like. It is to be understood that the invention is not limited in this regard.
A fourth embodiment of the present invention relates to a computer-readable storage medium storing a computer program. The computer program, when executed by a processor, implements the steps of the method for timing synchronization in passive intermodulation interference cancellation as described in the various embodiments above. Examples include:
acquiring M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
performing nonlinear combination on the time domain information of the M downlink transmitting signals to generate intermodulation products;
determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. A timing synchronization method in passive intermodulation interference cancellation is characterized by comprising the following steps:
acquiring M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
performing nonlinear combination on the time domain information of the M downlink transmission signals to generate intermodulation products;
determining a timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal.
2. The passive intermodulation interference cancellation timing synchronization method according to claim 1, wherein the performing nonlinear combination on the time domain information of the M downlink transmission signals to generate intermodulation products specifically includes:
acquiring M sampling points corresponding to the M downlink transmitting signals at the same time, and determining a component element set according to the M sampling points;
and generating N intermodulation products according to the component element set, wherein the intermodulation products are obtained by carrying out nonlinear combination on at least two component elements in the component element set.
3. The passive intermodulation interference cancellation timing synchronization method according to claim 2, wherein the determining the timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal specifically comprises:
selecting an intermodulation product which is most intersected with the frequency band of the uplink receiving signal as a main intermodulation product;
carrying out correlation calculation on the main intermodulation product and the uplink receiving signal to obtain a correlation sequence representing the correlation value of the uplink receiving signal and the intermodulation product;
and determining the position and amplitude corresponding to the maximum value in the correlation sequence, and determining the timing position of the PIM interference signal in the uplink received signal according to the position and amplitude.
4. The passive intermodulation interference cancellation timing synchronization method according to claim 3, wherein after determining the position and amplitude corresponding to the maximum value in each of the correlation sequences, further comprising:
abnormal value detection is carried out on the position and the amplitude corresponding to each intermodulation component, and abnormal values are screened out;
and carrying out smoothing processing on the data output after the abnormal value detection according to the smoothing filter.
5. The passive intermodulation interference cancellation timing synchronization method according to claim 2, wherein the determining the timing position of the PIM interference signal in the uplink received signal according to the intermodulation product and the correlation value of the uplink received signal specifically comprises:
performing correlation calculation on each intermodulation component and the uplink receiving signal to obtain a correlation sequence representing correlation values of the uplink receiving signal and each intermodulation component;
determining the position and amplitude corresponding to the maximum value in each correlation sequence;
and performing arithmetic average or weighted average processing on the position and amplitude corresponding to each intermodulation component, and determining the timing position of the PIM interference signal in the uplink received signal according to the position and amplitude after the arithmetic average or weighted average processing.
6. The passive intermodulation interference cancellation timing synchronization method of claim 2, wherein the determining the timing position of the PIM interference signal in the uplink received signal according to the correlation values of the intermodulation product and the uplink received signal further comprises:
obtaining a time domain estimation value of a PIM interference signal according to the timing position, the N intermodulation products and N coefficients which are determined by the uplink receiving signal and respectively correspond to the N intermodulation products, and the N intermodulation products;
and canceling the PIM interference signal based on the time domain estimation value.
7. A timing synchronization apparatus in passive intermodulation interference cancellation, comprising:
the signal acquisition module is used for acquiring M downlink transmitting signals and uplink receiving signals; the uplink receiving signals are provided with passive intermodulation PIM interference signals, the PIM interference signals are generated by the M downlink transmitting signals, and M is an integer greater than or equal to 2;
a component generating module, configured to perform nonlinear combination on the time domain information of the M downlink transmitting signals to generate intermodulation components;
and the timing synchronization module is used for determining the timing position of the PIM interference signal in the uplink receiving signal according to the intermodulation product and the correlation value of the uplink receiving signal.
8. A communication system, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the passive intermodulation interference cancellation timing synchronization method according to any of claims 1 to 6.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the passive intermodulation interference cancellation timing synchronization method according to any of the claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582708.4A CN112672416A (en) | 2020-12-28 | 2020-12-28 | Timing synchronization method and device in passive intermodulation interference cancellation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582708.4A CN112672416A (en) | 2020-12-28 | 2020-12-28 | Timing synchronization method and device in passive intermodulation interference cancellation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112672416A true CN112672416A (en) | 2021-04-16 |
Family
ID=75411146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011582708.4A Pending CN112672416A (en) | 2020-12-28 | 2020-12-28 | Timing synchronization method and device in passive intermodulation interference cancellation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112672416A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114710173A (en) * | 2022-05-27 | 2022-07-05 | 深圳市长丰影像器材有限公司 | Interference signal filtering method and device, electronic equipment and storage medium |
| CN115278754A (en) * | 2022-07-08 | 2022-11-01 | 中国联合网络通信集团有限公司 | Method and device for determining stimulated interference source and computer readable storage medium |
| WO2022246991A1 (en) * | 2021-05-25 | 2022-12-01 | 南京典格通信科技有限公司 | Method for canceling passive intermodulation interference in communication system on basis of delay calibration algorithm |
| CN116032315A (en) * | 2022-12-02 | 2023-04-28 | 珠海笛思科技有限公司 | Passive intermodulation interference signal processing method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103858355A (en) * | 2013-12-17 | 2014-06-11 | 华为技术有限公司 | Method and device for reducing intermodulation interference |
| US20150244414A1 (en) * | 2014-02-27 | 2015-08-27 | Scintera Networks Llc | In-service monitoring and cancellation of passive intermodulation interferences |
| CN107666361A (en) * | 2017-09-01 | 2018-02-06 | 廊坊银河信通科技有限公司 | The adaptive cancellation method and device of multicarrier passive intermodulation interference |
-
2020
- 2020-12-28 CN CN202011582708.4A patent/CN112672416A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103858355A (en) * | 2013-12-17 | 2014-06-11 | 华为技术有限公司 | Method and device for reducing intermodulation interference |
| US20150244414A1 (en) * | 2014-02-27 | 2015-08-27 | Scintera Networks Llc | In-service monitoring and cancellation of passive intermodulation interferences |
| CN107666361A (en) * | 2017-09-01 | 2018-02-06 | 廊坊银河信通科技有限公司 | The adaptive cancellation method and device of multicarrier passive intermodulation interference |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022246991A1 (en) * | 2021-05-25 | 2022-12-01 | 南京典格通信科技有限公司 | Method for canceling passive intermodulation interference in communication system on basis of delay calibration algorithm |
| CN114710173A (en) * | 2022-05-27 | 2022-07-05 | 深圳市长丰影像器材有限公司 | Interference signal filtering method and device, electronic equipment and storage medium |
| CN115278754A (en) * | 2022-07-08 | 2022-11-01 | 中国联合网络通信集团有限公司 | Method and device for determining stimulated interference source and computer readable storage medium |
| CN115278754B (en) * | 2022-07-08 | 2024-05-10 | 中国联合网络通信集团有限公司 | Method and device for determining stimulated interference source and computer-readable storage medium |
| CN116032315A (en) * | 2022-12-02 | 2023-04-28 | 珠海笛思科技有限公司 | Passive intermodulation interference signal processing method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112672416A (en) | Timing synchronization method and device in passive intermodulation interference cancellation | |
| US11025350B2 (en) | Detection and characterisation of passive intermodulation at a MIMO antenna array | |
| US9414245B2 (en) | Method and apparatus for detection of intermodulation products | |
| EP3076558B1 (en) | Method and device for reducing intermodulation interference | |
| EP2853048B1 (en) | Detection of intermodulation products | |
| EP3070852B1 (en) | Method of and apparatus for transmit noise reduction at a receiver | |
| GB2508398A (en) | Processing of harmonic products in a wireless network | |
| CN107911178B (en) | Channel calibration method and device | |
| CN104601259A (en) | Wireless communication receiver with i/q imbalance estimation and correction techniques | |
| US11172394B2 (en) | Method for channel state information CSI measurement, terminal device and network device | |
| EP1038366B1 (en) | Simulation process of radiofrequency scenario in radio mobile environment and testing system employing said process | |
| EP3427388B1 (en) | Non-linear interference detection | |
| US20190109611A1 (en) | Mitigating passive intermodulation interference in a mimo wireless network | |
| US20240113921A1 (en) | Transmit spur detection and mitigation for wireless communications devices | |
| CN107305225B (en) | Method and apparatus for VSWR estimation using cross-correlation and real number sampling without time alignment | |
| US10291273B2 (en) | Distortion cancellation device and method | |
| KR101905434B1 (en) | Apparatus for measuring passive intermodulation distortion signal and method for using the same | |
| CN111314924A (en) | Information transmission method, near-end equipment, far-end equipment and communication system | |
| KR102023452B1 (en) | analog intermodulation canceling device and its method | |
| JP6444328B2 (en) | Mobile terminal test apparatus and test method | |
| Bozed et al. | Modeling and Performance Analysis of the Transceiver Duplex Filter using SIMULINK | |
| Chafale et al. | Review on different new radio signals for precise indoor signaling and carrier phase reception using OFDM in 5G network | |
| GB2406984A (en) | Method and arrangement for I-Q balancing and radio receiver incorporating same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210416 |