CN111245486A - Method, device and equipment for reducing signal crosstalk - Google Patents

Method, device and equipment for reducing signal crosstalk Download PDF

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Publication number
CN111245486A
CN111245486A CN201811442327.9A CN201811442327A CN111245486A CN 111245486 A CN111245486 A CN 111245486A CN 201811442327 A CN201811442327 A CN 201811442327A CN 111245486 A CN111245486 A CN 111245486A
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China
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rru
bbu
signal
evm
precoding matrix
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CN201811442327.9A
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CN111245486B (en
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周键
杨爽
刘迅
许�鹏
陈可
周琴
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China Mobile Communications Group Co Ltd
China Mobile Group Sichuan Co Ltd
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China Mobile Communications Group Co Ltd
China Mobile Group Sichuan Co Ltd
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Abstract

The embodiment of the application provides a method, a device and equipment for reducing signal crosstalk, wherein the method can comprise the following steps: the base band unit BBU establishes frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot frequency sequence; the BBU performs MIMO equalization processing on the uplink signal; the BBU carries out precoding on a downlink signal sent to the RRU according to Channel State Information (CSI) and precoding matrix information sent by the RRU, so that the RRU determines an average Error Vector Magnitude (EVM); and when the EVM is smaller than the preset threshold, the BBU updates the precoding matrix information so as to precode the downlink signals according to the updated precoding matrix information. In the application, a downlink coding technology and an uplink equalization technology are utilized, and crosstalk among network lines is fully utilized to carry out combined signal processing, so that the problem that when a receiving and transmitting channel is in the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk among the network lines is solved.

Description

Method, device and equipment for reducing signal crosstalk
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, and a computer storage medium for reducing signal crosstalk.
Background
Currently, as shown in fig. 1, an indoor distributed base station system mainly includes a baseband unit (BBU), a remote signal forwarding unit (RHUB), and a Radio Remote Unit (RRU). The BBU and the RHUB are connected through optical fibers, the RHUB and the RRU are connected and powered through a super five-type network cable (CAT5e) or a six-type network cable (CAT6), and a data return task is completed. Because CAT5e or CAT6 connecting RHUB and RRU belong to a non-shielded network cable, and one RHUB can support a maximum of 16 RRUs, the network cables are generally tightly bundled at the entrance of a cabinet where the RHUB is located, crosstalk between the network cables often causes that an interface cannot reach an ideal transmission capacity, or the RRU cannot be extended to an ideal coverage distance due to insufficient transmission capacity, or even causes transmission flash, which affects the overall performance of the network and user experience.
Among them, crosstalk can be classified into near-end crosstalk (NEXT) and far-end crosstalk (FEXT). When the signals (e.g., disturber and victim lines) on the transmit and receive channels are alien frequencies, the effects of NEXT and FEXT can be eliminated or reduced by filters. However, when the FEXT signal of the interfering pair is the same frequency as the normal reception signal of the interfered pair, it cannot be cancelled by the filter.
Disclosure of Invention
The embodiment of the application provides a method, a device, equipment and a computer storage medium for reducing signal crosstalk, which are used for solving the problem that when a receiving and transmitting channel is the same frequency, the transmission capacity of an indoor distributed base station system is low due to far-end crosstalk of signals among cables in the indoor distributed base station system.
In a first aspect, an embodiment of the present application provides a method for reducing signal crosstalk, which may include:
the base band unit BBU establishes frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot frequency sequence;
the BBU performs MIMO equalization processing on the uplink signal;
the BBU carries out precoding on a downlink signal sent to the RRU according to Channel State Information (CSI) and precoding matrix information sent by the RRU, so that the RRU determines an average Error Vector Magnitude (EVM);
and when the EVM meets a first preset threshold, the BBU updates the precoding matrix information so as to precode the downlink signals according to the updated precoding matrix information.
In the application, a downlink coding technology and an uplink equalization technology are utilized, and crosstalk among network lines is fully utilized to carry out combined signal processing, so that the problem that when a receiving and transmitting channel is in the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk among the network lines is solved.
In a possible embodiment, before the step of establishing, by the baseband unit BBU, frame synchronization of an uplink signal and a downlink signal between the BBU and the remote radio unit RRU according to the preset pilot sequence, the method may further include:
and establishing timing synchronization between the BBU and the RRU.
In order to ensure that the respective corresponding functions of the proposed BBU and RRU can achieve sampling phase synchronization, i.e., each unit works in an optimal snr state, timing synchronization, or symbol synchronization, needs to be established between a receiving end (e.g., BBU or RRU) and a transmitting end (e.g., BBU or RRU).
In another possible embodiment, the step of performing MIMO equalization processing on the uplink signal by the BBU specifically includes:
and the BBU sequentially performs MIMO equalization processing and signal detection on the uplink signal sent by the RRU.
Because the transmission network cable with crosstalk between network cables in the indoor distributed base station system is equivalent to the characteristic of an MIMO channel, the indoor remote system which supports higher network cable return transmission capacity and longer coverage distance under the condition of not laying indoor cables again is realized by adding related technologies such as precoding and equalization in the original indoor distributed base station system and adopting a downlink precoding technology, MIMO equalization and signal detection.
In another possible embodiment, in the step of "the BBU precodes the downlink signal sent to the RRU according to the channel state information CSI and the precoding matrix information sent by the RRU", the method specifically includes:
the BBU selects precoding matrix information corresponding to the CSI from a precoding matrix database according to the CSI; and the BBU utilizes the precoding matrix information to precode the downlink signals.
The method provided by the application can reduce the complexity and power consumption of RRU hardware, so that a large amount of calculation is handed over to BBU processing, and the BBU needs to determine the state of the RRU, thereby improving the reliability of the whole indoor distributed base station system, effectively reducing the cost of modification and upgrade, and meeting the requirement of wireless signal coverage facing 5G and with higher communication rate.
In yet another possible embodiment, the method may further include:
when the EVM is larger than or equal to the preset threshold and the iteration number of the EVM meets a second preset condition, the BBU iteratively updates the precoding matrix information, and the updated preset coding matrix information is adopted to precode the downlink signals.
Since a certain degree of misjudgment occurs only after once convergence judgment, once judgment (that is, whether the iteration number satisfies the preset condition) can be performed, thereby improving the accuracy.
In a second aspect, embodiments of the present application provide a method for reducing signal crosstalk, which may include:
the RRU establishes frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot frequency sequence;
the RRU determines Channel State Information (CSI) according to the downlink signal;
the RRU determines an average Error Vector Magnitude (EVM) according to the first pilot frequency sequence and a preset pilot frequency sequence;
the RRU judges whether the EVM meets a first preset threshold or not and sends a judgment result to the BBU; the first pilot sequence is a pilot sequence obtained by normalizing a pilot sequence in a downlink signal by the RRU.
In the application, a method for performing combined signal processing by utilizing a downlink precoding technology and uplink equalization and fully utilizing crosstalk between network lines is used for solving the problem that when a receiving and transmitting channel is the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk between the network lines.
In a possible embodiment, in the step of determining, by the RRU, whether the EVM satisfies the first preset threshold and sending the determination result to the BBU, the method specifically includes:
when the EVM is smaller than a first preset threshold, the RRU sends a result that the EVM meets the first preset threshold to the BBU, so that the BBU can update the precoding matrix information conveniently;
and when the EVM is greater than or equal to the first preset threshold, the RRU judges whether the iteration number of the EVM is smaller than a second preset threshold.
In another possible embodiment, in the step of determining, by the RRU, whether the number of iterations for calculating the EVM is less than a second preset threshold, the method specifically includes:
and when the iteration number of the EVM is smaller than a second preset threshold, the RRU sends prompt information to the BBU, the prompt information prompts the BBU to update precoding matrix information in an iteration mode, and the updated preset coding matrix information is adopted to precode downlink signals.
Since a certain degree of misjudgment occurs only after once convergence judgment, once judgment (that is, whether the iteration number satisfies the preset condition) can be performed, thereby improving the accuracy.
In summary, with the content described in the first aspect and the second aspect, the problem that crosstalk between network cables reduces transmission capacity when an RRU uplink signal is transmitted back by using the network cables in an indoor distributed base station system is solved, the remote coverage distance, the quality of the transmitted signal and the transmission capacity of RRU equipment are improved, the problem of indoor rewiring caused by upgrading of the hardware capability of a base station is reduced by a method for processing the uplink signal and the downlink signal, and construction and coordination costs can be significantly saved.
In a third aspect, an embodiment of the present application provides an apparatus for reducing signal crosstalk, where the apparatus may include:
the processing module is used for establishing frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot frequency sequence;
the interface signal enhancement module is used for carrying out MIMO (multiple input multiple output) equalization processing on the uplink signal;
the interface signal enhancement module is further used for precoding a downlink signal sent to the RRU according to Channel State Information (CSI) and precoding matrix information sent by the RRU so that the RRU can determine an average Error Vector Magnitude (EVM);
when the EVM satisfies the first preset threshold, the interface signal enhancement module is further configured to update the precoding matrix information, so as to precode the downlink signal according to the updated precoding matrix information.
In the application, a downlink coding technology and an uplink equalization technology are utilized, and crosstalk among network lines is fully utilized to carry out combined signal processing, so that the problem that when a receiving and transmitting channel is in the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk among the network lines is solved.
In one possible embodiment, the above "interface signal enhancement module" may also be configured to establish timing synchronization between the BBU and the RRU.
In order to ensure that the respective corresponding functions of the proposed BBU and RRU can achieve sampling phase synchronization, i.e., each unit works in an optimal snr state, timing synchronization, or symbol synchronization, needs to be established between a receiving end (e.g., BBU or RRU) and a transmitting end (e.g., BBU or RRU).
In another possible embodiment, the interface signal enhancement module may be further configured to perform MIMO equalization processing and signal detection on the uplink signal sent by the RRU in sequence.
Because the transmission network cable with crosstalk between network cables in the indoor distributed base station system is equivalent to the characteristic of an MIMO channel, the indoor remote system which supports higher network cable return transmission capacity and longer coverage distance under the condition of not laying indoor cables again is realized by adding related technologies such as precoding and equalization in the original indoor distributed base station system and adopting a downlink precoding technology, MIMO equalization and signal detection.
In yet another possible embodiment, the interface signal enhancement module may be specifically configured to select, by the BBU, precoding matrix information corresponding to the CSI from a precoding matrix database; and the BBU utilizes the precoding matrix information to precode the downlink signals.
The method provided by the application can reduce the complexity and power consumption of RRU hardware, so that a large amount of calculation is handed over to BBU processing, and the BBU needs to determine the state of the RRU, thereby improving the reliability of the whole indoor distributed base station system, effectively reducing the cost of modification and upgrade, and meeting the requirement of wireless signal coverage facing 5G and with higher communication rate.
In yet another possible embodiment, the interface signal enhancement module may be further configured to, when the EVM is greater than or equal to a preset threshold and the number of iterations of calculating the EVM satisfies a second preset condition, update the precoding matrix information by the BBU iteration, and precode the downlink signal by using the updated preset coding matrix information.
Since a certain degree of misjudgment occurs only after once convergence judgment, once judgment (that is, whether the iteration number satisfies the preset condition) can be performed, thereby improving the accuracy.
In a fourth aspect, an embodiment of the present application provides an apparatus for reducing signal crosstalk, where the apparatus may include:
the processing module is used for establishing frame synchronization of an uplink signal and a downlink signal between the baseband unit BBU and the RRU according to a preset pilot frequency sequence;
the interface signal enhancement module is used for determining Channel State Information (CSI) according to the downlink signal;
the interface signal enhancement module is also used for determining an average Error Vector Magnitude (EVM) according to the first pilot frequency sequence and a preset pilot frequency sequence; the RRU judges whether the EVM meets a first preset threshold or not and sends a judgment result to the remote radio module; the first pilot sequence is a pilot sequence obtained by normalizing a pilot sequence in a downlink signal by the RRU.
In the application, a method for performing combined signal processing by utilizing a downlink precoding technology and uplink equalization and fully utilizing crosstalk between network lines is used for solving the problem that when a receiving and transmitting channel is the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk between the network lines.
In a possible embodiment, the "interface signal enhancement module" may specifically include:
when the EVM is smaller than a first preset threshold, the RRU sends a result that the EVM meets the first preset threshold to the BBU, so that the BBU can update the precoding matrix information conveniently;
and when the EVM is greater than or equal to the first preset threshold, the RRU judges whether the iteration number of the EVM is smaller than a second preset threshold.
In yet another possible embodiment, the "interface signal enhancement module" may specifically include:
when the iteration number of the EVM is smaller than a second preset threshold, the RRU sends prompt information to the BBU, the prompt information is used for prompting the BBU to update precoding matrix information in an iteration mode, and precoding is carried out on the downlink signal by adopting the updated preset coding matrix information.
In a fifth aspect, an embodiment of the present application provides an apparatus for reducing signal crosstalk, where the apparatus may include:
the processor is used for establishing frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot frequency sequence;
the interface signal enhancer is used for carrying out MIMO (multiple input multiple output) equalization processing on the uplink signal;
the interface signal enhancer is further used for precoding a downlink signal sent to the RRU according to the Channel State Information (CSI) and the precoding matrix information sent by the RRU so that the RRU can determine an average Error Vector Magnitude (EVM);
when the EVM satisfies the first preset threshold, the interface signal enhancer is further configured to update the precoding matrix information, so as to precode the downlink signal according to the updated precoding matrix information.
In the application, a downlink coding technology and an uplink equalization technology are utilized, and crosstalk among network lines is fully utilized to carry out combined signal processing, so that the problem that when a receiving and transmitting channel is in the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk among the network lines is solved.
In one possible embodiment, the above-mentioned "interface signal booster" may also be used to establish timing synchronization between the BBU and the RRU.
In order to ensure that the respective corresponding functions of the proposed BBU and RRU can achieve sampling phase synchronization, i.e., each unit works in an optimal snr state, timing synchronization, or symbol synchronization, needs to be established between a receiving end (e.g., BBU or RRU) and a transmitting end (e.g., BBU or RRU).
In another possible embodiment, the interface signal enhancer may be further configured to sequentially perform MIMO equalization processing and signal detection on an uplink signal sent by the RRU.
Because the transmission network cable with crosstalk between network cables in the indoor distributed base station system is equivalent to the characteristic of an MIMO channel, the indoor remote system which supports higher network cable return transmission capacity and longer coverage distance under the condition of not laying indoor cables again is realized by adding related technologies such as precoding and equalization in the original indoor distributed base station system and adopting a downlink precoding technology, MIMO equalization and signal detection.
In yet another possible embodiment, the interface signal enhancer may be specifically configured to select, by the BBU, precoding matrix information corresponding to the CSI from a precoding matrix database; and the BBU utilizes the precoding matrix information to precode the downlink signals.
The method provided by the application can reduce the complexity and power consumption of RRU hardware, so that a large amount of calculation is handed over to BBU processing, and the BBU needs to determine the state of the RRU, thereby improving the reliability of the whole indoor distributed base station system, effectively reducing the cost of modification and upgrade, and meeting the requirement of wireless signal coverage facing 5G and with higher communication rate.
In yet another possible embodiment, the interface signal enhancer may be further configured to, when the EVM is greater than or equal to a preset threshold and the number of iterations of calculating the EVM satisfies a second preset condition, update the precoding matrix information by the BBU in an iterative manner, and precode the downlink signal by using the updated preset coding matrix information.
Since a certain degree of misjudgment occurs only after once convergence judgment, once judgment (that is, whether the iteration number satisfies the preset condition) can be performed, thereby improving the accuracy.
In a sixth aspect, an embodiment of the present application provides an apparatus for reducing signal crosstalk, where the apparatus may include:
the processor is used for establishing frame synchronization of an uplink signal and a downlink signal between the baseband unit BBU and the RRU according to a preset pilot frequency sequence;
the interface signal enhancer is used for determining Channel State Information (CSI) according to the downlink signal;
the interface signal enhancer is also used for determining an average Error Vector Magnitude (EVM) according to the first pilot frequency sequence and a preset pilot frequency sequence; the RRU judges whether the EVM meets a first preset threshold or not and sends a judgment result to the remote radio unit; the first pilot sequence is a pilot sequence obtained by normalizing a pilot sequence in a downlink signal by the RRU.
In the application, a method for performing combined signal processing by utilizing a downlink precoding technology and uplink equalization and fully utilizing crosstalk between network lines is used for solving the problem that when a receiving and transmitting channel is the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk between the network lines.
In a possible embodiment, the "interface signal enhancer" may specifically include:
when the EVM is smaller than a first preset threshold, the RRU sends a result that the EVM meets the first preset threshold to the BBU, so that the BBU can update the precoding matrix information conveniently;
and when the EVM is greater than or equal to the first preset threshold, the RRU judges whether the iteration number of the EVM is smaller than a second preset threshold.
In yet another possible embodiment, the "interface signal enhancer" may specifically include:
and when the iteration number of the EVM is smaller than a second preset threshold, the RRU sends prompt information to the BBU, the prompt information prompts the BBU to update precoding matrix information in an iteration mode, and the updated preset coding matrix information is adopted to precode downlink signals.
Since a certain degree of misjudgment occurs only after once convergence judgment, once judgment (that is, whether the iteration number satisfies the preset condition) can be performed, thereby improving the accuracy.
In a seventh aspect, an embodiment of the present application provides a system for reducing signal crosstalk, where the system may include: a remote signal forwarding module, such as the module of any one of the third aspect or the fourth aspect.
In an eighth aspect, an embodiment of the present application provides a system for reducing signal crosstalk, where the system may include: a remote signal forwarding unit RHUB, as in any one of the fifth or sixth aspects.
In a ninth aspect, embodiments of the present application provide a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method of any one of the first aspect or the second aspect.
In a tenth aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the first or second aspects.
In summary, with the contents described in the first to tenth aspects, the problem that crosstalk between network cables reduces transmission capacity when an RRU uplink signal is transmitted back by using the network cables in an indoor distributed base station system is solved, the remote coverage distance, the quality of the transmitted signal and the transmission capacity of RRU equipment are improved, the problem of indoor rewiring caused by upgrading of the hardware capability of a base station is reduced by a method for processing the uplink signal and the downlink signal, and construction and coordination costs can be significantly saved.
In addition, the network cable back channel crosstalk model is abstracted into a multiple-input multiple-output channel model, and joint signal processing is carried out by adopting multiple-input multiple-output precoding and equalization technology, so that the network cable transmission capacity is improved, the hardware system architecture is stable due to the algorithm complexity, and the commercial reliability of products is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an indoor distributed base station system;
fig. 2 is a schematic diagram of an operation architecture of a BBU and an RRU in an indoor distributed base station system;
fig. 3 is a schematic diagram illustrating an operation architecture of a backhaul transport channel of a network cable according to an embodiment of the present application;
fig. 4 is a schematic diagram of an operation architecture of a BBU and an RRU in an indoor distributed base station system according to an embodiment of the present application;
FIG. 5 is an interaction diagram of a method for reducing signal crosstalk according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an average error vector magnitude provided by an embodiment of the present application;
fig. 7 is an interaction diagram for establishing frame synchronization of an uplink signal and a downlink signal between a BBU and an RRU according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an apparatus for reducing signal crosstalk according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of another apparatus for reducing signal crosstalk according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an apparatus for reducing signal crosstalk according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of another apparatus for reducing signal crosstalk according to an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to solve the prior art problems, embodiments of the present application provide a method, an apparatus, a device, and a computer storage medium for reducing signal crosstalk.
First, the operation architecture of the BBU and the RRU in the indoor distributed base station system will be described in detail below.
Fig. 2 is a schematic diagram of an operation architecture of the BBU and the RRU in the indoor distributed base station system.
As shown in fig. 2, the BBU and the RHUB are connected by optical fibers, and the RHUB and the RRU are connected by a super five-type network cable (CAT5e) or a six-type network cable (CAT6) to supply power, and complete a data return task. The network cable return interface between the RHUB and the RRU generally adopts pulse amplitude modulation, a sending end (such as the RHUB or the RRU) pre-balances a modulated signal, and is matched with a receiving end (such as the RHUB or the RRU) time domain equalization algorithm to reduce intersymbol interference of a transmission channel, and the network cable return interface also has strong inhibition capacity on crosstalk and echo between twisted pairs in a single network cable by combining an enhancement algorithm.
Generally, the function of the RHUB is to provide a route for multiple paths of data, and no new inter-line crosstalk is introduced, so that the inter-line return crosstalk between the BBU and the RRU can be simplified. Since such crosstalk between network cables cannot be solved in the framework of the existing indoor distributed base station system, if the multi-band coverage and carrier aggregation of the 4generation mobile communication technology (4G) and the signal coverage of the 5-generation mobile communication technology (5G) are supported, high-class network cables must be re-laid or optical fibers are used to replace the network cables. However, the indoor distributed base station system has a complex wiring environment and high coordination and construction difficulty, and some high-class hard network cables in special scenes may not be laid, which results in high cost investment in system upgrading or reconstruction.
Therefore, the original laid network cable is not replaced as far as possible, and the far-end crosstalk of signals among the network cables in the indoor distributed base station system is solved when the receiving and sending channels are the same frequency, so that the transmission capacity returned by the network cables in the indoor distributed base station system is improved.
The embodiments of the present application provide a method for reducing far-end crosstalk of signals between network cables to improve transmission capacity of network cable backhaul in an indoor distributed base station system with reference to fig. 3 to 7.
As a backhaul transmission channel between the RHUB and the RRU, generally, there are 4 pairs of twisted pairs in each network cable, and the crosstalk principle between each pair of twisted pairs is the same as that between cables of different network cables, and the cancellation method is consistent without loss of generality. As shown in fig. 3, the present disclosure only explains the crosstalk between network lines as an example, and the 4-path transceiving processing supported by each pair of RHUB and RRU network line interfaces can be simplified to 1-path for illustration. For example, crosstalk of FEXT on the transmitted/received signal makes the network cable equivalent to an N × N MIMO channel, where N is the number of network cables, i.e., the number of RRUs connected to any RHUB corresponding to BBU. Therefore, after determining the corresponding relationship between the BBU and the RRU, the BBU can precode downlink precoding, and combine FEXT interference H of the ith network line to the jth network linei,jThe method for enhancing the effective signal and modulating the interference signal improves the transmission capacity of the network cable return in the indoor distributed base station system.
Fig. 4 is a schematic diagram of an operation architecture of a BBU and an RRU in an indoor distributed base station system according to an embodiment of the present application.
As shown in fig. 4, after determining the corresponding relationship between the BBU and the RRU, interface signal enhancement units are added on the BBU and the RRU sides, respectively (that is, "units" appearing in this application refer to "devices", which are entity devices).
The interface signal enhancement unit on the BBU side can be used for carrying out MIMO equalization processing on the uplink signal by the BBU; the BBU carries out precoding on a downlink signal sent to the RRU according to Channel State Information (CSI) and precoding matrix information sent by the RRU, so that the RRU determines an average Error Vector Magnitude (EVM); and when the EVM meets a first preset threshold, the BBU updates the precoding matrix information so as to precode the downlink signals according to the updated precoding matrix information.
In general, the precoding described above is a non-codebook precoding technique. Of course, the overhead estimation can be performed according to a specific application scenario and an overhead estimation of the indoor distributed base station system, and a precoding technology based on a codebook can also be adopted. In addition, when the overhead of the indoor distributed base station system allows, the precoding may also calculate and feed back an uplink signal to the RRU according to the pilot information, and perform pre-equalization processing on the RRU side, where the uplink signal may include estimation information of an uplink channel.
The interface signal enhancement unit on the RRU side can be configured to determine channel state information CSI according to a preset pilot sequence and send the CSI to the BBU; the interface signal enhancement module is also used for receiving a downlink precoding matrix sent by the baseband module; determining an average Error Vector Magnitude (EVM) according to the first pilot frequency sequence and a preset pilot frequency sequence; the RRU judges whether the EVM meets a first preset threshold or not and sends a judgment result to the BBU; the first pilot sequence is a pilot sequence of a preset pilot sequence which is subjected to normalization processing.
The above-mentioned improvement to BBU and RRU side concentrates the complexity that brings to transmission capacity improvement to BBU and handles, can reduce in the RRU side hardware equipment's complexity and consumption, can reduce the indoor distributed base station system because the far-end crosstalk of net twine signal to promote the transmission capacity of net twine passback in the indoor distributed base station system simultaneously.
According to the method, the network cable return channel crosstalk model is abstracted into a multi-input multi-output channel model, and the multi-input multi-output precoding and equalization technology is adopted for combined signal processing, so that the network cable transmission capacity is improved, the hardware system architecture is stable due to the algorithm complexity, and the commercial reliability of products is improved
The following describes in detail the interaction between the uplink signal and the downlink signal between the BBU and the RRU.
Fig. 5 is an interaction diagram of a method for reducing signal crosstalk according to an embodiment of the present application.
As shown in fig. 5, the method may include S510-S570, before performing the following method, it is further required to preferentially determine a correspondence between the BBU and the RRUs, that is, the number of RRUs connected to any RHUB corresponding to the BBU, and the specific method may be as follows:
s510: and establishing timing synchronization between the base band unit BBU and the radio remote unit RRU.
Specifically, to ensure that the respective corresponding functions in the BBU side interface signal enhancement processing unit and the RRU side interface signal enhancement processing unit can achieve sampling phase synchronization, that is, each unit works in an optimal signal-to-noise ratio state, timing synchronization, or symbol synchronization, needs to be established between the BBU and the RRU. A Gardner timing recovery algorithm can be generally employed to establish timing synchronization of both ends, i.e., the receiving end and the transmitting end. It should be noted that, in the embodiment of the present application, it can be understood that the BBU may be a receiving end or a sending end, and the RRU is the same.
S520: and establishing frame synchronization of the uplink signal and the downlink signal between the BBU and the RRU.
Specifically, the BBU side inserts a preset pilot sequence, which is configured in advance at the receiving end and the transmitting end, into a downlink signal corresponding to any one of the RRUs.
And the RRU side establishes frame synchronization of the signals transmitted and received between the BBU and the RRU according to autocorrelation of preset pilot sequences which are configured and completed in advance at the receiving end and the transmitting end.
S530: and the BBU sequentially performs MIMO equalization processing and signal detection on the uplink signal sent by the RRU.
Specifically, the RRU needs to send an uplink signal, so that the BBU can communicate when determining that the RRU satisfies the communication condition.
The MIMO equalization and signal detection may be calculated by using a Least Square (LS) or Least Mean Square (LMS) antenna adaptive interference suppression method.
S540: and the RRU determines Channel State Information (CSI) according to a downlink signal sent to the RRU by the BBU.
Specifically, the downlink signal may include a pilot sequence of the BBU. And the RRU calculates the CSI of the network cable transmission channel according to the pilot frequency sequence of the BBU sent by the BBU.
And the RRU feeds back the CSI to the BBU through an upper layer reliable dedicated channel.
S550: and the BBU carries out precoding on the downlink signals according to the CSI.
Specifically, the BBU selects a precoding matrix corresponding to the CSI from a precoding matrix database according to the CSI; and the BBU utilizes the precoding matrix to precode the downlink signals.
And the BBU sends the downlink signal after precoding to the RRU.
S560: the RRU determines an average Error Vector Magnitude (EVM) according to the first pilot sequence and a preset pilot sequence, judges whether the EVM meets a first preset threshold, and sends a judgment result to the BBU; the first pilot sequence is a pilot sequence obtained by normalizing a pilot sequence in a downlink signal by the RRU.
When the EVM is smaller than the first preset threshold, the precoding matrix is converged, and a judgment result is sent to the BBU, so that the BBU can update the precoding matrix information conveniently.
When the EVM is greater than or equal to the first preset threshold, the RRU needs to determine whether the number of iterations for calculating the EVM is less than a second preset threshold.
And when the iteration number is smaller than a second preset threshold, the RRU sends prompt information to the BBU, the prompt information prompts the BBU to update a precoding matrix in an iteration mode, and the downlink signal is precoded by adopting a new preset coding matrix. And when the iteration number is greater than or equal to a second preset threshold, alarming and pushing out the flow, wherein the reason may be that the link is an uplink link and a downlink link, which may cause problems and need to be positioned.
The EVM technique mentioned above is described in detail with reference to fig. 6, and as shown in fig. 6, the EVM technique is obtained by calculating a ratio of root mean square of each of the first pilot sequence and the preset pilot sequence, and the calculation formula is as follows:
Figure BDA0001884941500000141
wherein, s (t) is a transmitting-end pilot vector, and r (t) is a receiving-end pilot vector. The EVM is determined by the receiving-end pilot and the transmitting-end pilot in fig. 6.
It should be noted that the first pilot sequence is a pilot sequence obtained by normalizing a pilot sequence in a downlink signal by the RRU.
S570: after the convergence of the precoding matrix is determined, the system enters a normal data symbol transmission and MIMO signal detection process, and because a transmission channel slowly changes along with the fluctuation of the environment such as temperature and the like, the BBU needs to periodically track and update the information in a precoding matrix database, so that the BBU can precode downlink signals according to the updated precoding matrix information.
It should be noted that, in S520, frame synchronization on the RRU downlink signal may be specifically described as an example, and similarly, frame synchronization on the BBU downlink signal is similar to that, and therefore, description is omitted again.
Fig. 7 is an interaction diagram for establishing frame synchronization of an uplink signal and a downlink signal between a BBU and an RRU according to an embodiment of the present application. Specifically, as shown in fig. 7, the method may include: S710-S720, as follows:
s710: and inserting a preset pilot sequence which is configured in advance into any RHUB transmission signal corresponding to the BBU.
Specifically, the transmission signal is transmitted by RHUB to RRU.
S720: and the RRU side performs sliding correlation calculation with the downlink signal according to autocorrelation of a preset pilot sequence which is configured and completed in advance at the receiving end and the sending end.
When the sliding correlation calculation result shows that the correlation is greater than or equal to the third preset threshold and is locally optimal, it indicates that the correlation is located at the frame synchronization starting point, and the step S530 may be entered.
And judging whether the correlation calculation times exceed a threshold or not when the correlation is smaller than the threshold or not.
And if the threshold is exceeded, alarming and pushing out the flow, wherein the reason may be that the link is an uplink link and a downlink link, which may cause problems and need to be positioned.
If the threshold is not exceeded, the next sliding correlation calculation is continued, i.e., S720 is repeatedly performed.
Fig. 8 is a schematic structural diagram of an apparatus for reducing signal crosstalk according to an embodiment of the present application.
As shown in fig. 8, the apparatus 800 may include: the processing module 81 is configured to establish frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot sequence;
the interface signal enhancement module 82 is configured to perform MIMO equalization processing on the uplink signal;
the interface signal enhancement module 82 is further configured to precode a downlink signal sent to the RRU according to channel state information CSI and precoding matrix information sent by the RRU, so that the RRU determines an average error vector magnitude EVM;
when the EVM satisfies the first preset threshold, the interface signal enhancing module 82 is further configured to update the precoding matrix information, so as to precode the downlink signal according to the updated precoding matrix information.
In the application, a downlink coding technology and an uplink equalization technology are utilized, and crosstalk among network lines is fully utilized to carry out combined signal processing, so that the problem that when a receiving and transmitting channel is in the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk among the network lines is solved.
The interface signal enhancing module 82 may also be configured to establish timing synchronization between the BBU and the RRU; sequentially carrying out MIMO (multiple input multiple output) equalization processing and signal detection on an uplink signal sent by an RRU (remote radio unit); the BBU selects precoding matrix information corresponding to the CSI from a precoding matrix database according to the CSI; the BBU carries out precoding on the downlink signals by utilizing the precoding matrix information;
when the EVM is larger than or equal to the preset threshold and the iteration number of the EVM meets a second preset condition, the BBU iteratively updates the precoding matrix information, and the updated preset coding matrix information is adopted to precode the downlink signals.
It should be noted that the apparatus may further include a storage module 83, which may include a Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
Fig. 9 is a schematic structural diagram of another apparatus for reducing signal crosstalk according to an embodiment of the present application. As shown in fig. 9, the apparatus 900 may include: the processing module 91 is configured to establish frame synchronization of an uplink signal and a downlink signal between the baseband unit BBU and the RRU according to a preset pilot sequence;
an interface signal enhancement module 92, configured to determine channel state information CSI according to the downlink signal;
the interface signal enhancement module 92 is further configured to determine an average error vector magnitude EVM according to the first pilot sequence and a preset pilot sequence; the RRU judges whether the EVM meets a first preset threshold or not and sends a judgment result to the remote radio module; the first pilot sequence is a pilot sequence obtained by normalizing a pilot sequence in a downlink signal by the RRU.
The interface signal enhancement module 92 may specifically include: when the EVM is smaller than a first preset threshold, the RRU sends a result that the EVM meets the first preset threshold to the BBU, so that the BBU can update the precoding matrix information conveniently;
and when the EVM is greater than or equal to the first preset threshold, the RRU judges whether the iteration number of the EVM is smaller than a second preset threshold. And when the iteration number of the EVM is smaller than a second preset threshold, the RRU sends prompt information to the BBU, the prompt information prompts the BBU to update precoding matrix information in an iteration mode, and the updated preset coding matrix information is adopted to precode downlink signals. And when the iteration number of the EVM is calculated to be more than or equal to a second preset threshold, alarming and pushing out the process, wherein the reason may be that the link is an uplink link and a downlink link, which may cause problems and need to be positioned.
It should be noted that the apparatus may further include a storage module 93, which may include a Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
Fig. 10 is a schematic structural diagram of an apparatus for reducing signal crosstalk according to an embodiment of the present application; the apparatus 1000 may include: the processing unit 101 is configured to establish frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot sequence;
an interface signal enhancement unit 102, configured to perform MIMO equalization processing on the uplink signal;
the interface signal enhancement unit 102 is further configured to precode a downlink signal sent to the RRU according to channel state information CSI and precoding matrix information sent by the RRU, so that the RRU determines an average error vector magnitude EVM;
when the EVM satisfies the first preset threshold, the interface signal enhancer is further configured to update the precoding matrix information, so as to precode the downlink signal according to the updated precoding matrix information. In the application, a downlink coding technology and an uplink equalization technology are utilized, and crosstalk among network lines is fully utilized to carry out combined signal processing, so that the problem that when a receiving and transmitting channel is in the same frequency, and RRU in an indoor distributed base station system utilizes the network lines to transmit back to a BBU, the transmission capacity is reduced by the crosstalk among the network lines is solved.
The interface signal enhancing unit 102 may also be configured to establish timing synchronization between the BBU and the RRU; sequentially carrying out MIMO (multiple input multiple output) equalization processing and signal detection on an uplink signal sent by an RRU (remote radio unit); when the EVM is larger than or equal to the preset threshold and the iteration number of the EVM meets a second preset condition, the BBU iteratively updates the precoding matrix information, and the updated preset coding matrix information is adopted to precode the downlink signals.
The interface signal enhancing unit 102 may be specifically configured to select, by the BBU, precoding matrix information corresponding to the CSI from a precoding matrix database; and the BBU utilizes the precoding matrix information to precode the downlink signals.
It should be noted that the apparatus may further include a memory 103, which may include a Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
Fig. 11 is a schematic structural diagram of another apparatus for reducing signal crosstalk according to an embodiment of the present application.
As shown in fig. 11, the apparatus 1100 may include: the processing unit 111 is configured to establish frame synchronization of an uplink signal and a downlink signal between the baseband unit BBU and the RRU according to a preset pilot sequence;
an interface signal enhancing unit 112, configured to determine channel state information CSI according to the downlink signal;
the interface signal enhancement unit 112 is further configured to determine an average error vector magnitude EVM according to the first pilot sequence and a preset pilot sequence; the RRU judges whether the EVM meets a first preset threshold or not and sends a judgment result to the remote radio unit; the first pilot sequence is a pilot sequence obtained by normalizing a pilot sequence in a downlink signal by the RRU.
The interface signal enhancing unit 112 may specifically include: when the EVM is smaller than a first preset threshold, the RRU sends a result that the EVM meets the first preset threshold to the BBU, so that the BBU can update the precoding matrix information conveniently; and when the EVM is greater than or equal to the first preset threshold, the RRU judges whether the iteration number of the EVM is smaller than a second preset threshold. And when the iteration number of the EVM is smaller than a second preset threshold, the RRU sends prompt information to the BBU, the prompt information prompts the BBU to update precoding matrix information in an iteration mode, and the updated preset coding matrix information is adopted to precode downlink signals.
It should be noted that the apparatus may further include a memory 113, which may include a Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
In particular, the processing unit may also be represented as a processor, which may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application. The above described interface signal enhancement unit may also be denoted as an interface signal enhancer.
In addition, in combination with the online data traffic charging method in the foregoing embodiment, the embodiment of the present application may provide a computer storage medium to implement. The computer storage medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement any of the online data traffic charging methods in the above embodiments.
It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As will be apparent to those skilled in the art, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims (11)

1. A method for reducing signal crosstalk, comprising:
the method comprises the steps that a baseband unit BBU establishes frame synchronization of an uplink signal and a downlink signal between the BBU and a radio remote unit RRU according to a preset pilot frequency sequence;
the BBU performs MIMO equalization processing on the uplink signal;
the BBU carries out precoding on the downlink signal sent to the RRU according to Channel State Information (CSI) and precoding matrix information sent by the RRU so that the RRU can determine an average Error Vector Magnitude (EVM);
and when the EVM meets a first preset threshold, the BBU updates the precoding matrix information so as to precode the downlink signals according to the updated precoding matrix information.
2. The method according to claim 1, wherein before the step of the baseband unit BBU establishing frame synchronization of the uplink signal and the downlink signal between the BBU and the remote radio unit RRU according to a preset pilot sequence, the method further comprises:
and establishing timing synchronization between the BBU and the RRU.
3. The method according to claim 1 or 2, wherein the BBU precodes the downlink signal sent to the RRU according to channel state information CSI and precoding matrix information sent by the RRU, including:
the BBU selects the precoding matrix information corresponding to the CSI from a precoding matrix database according to the CSI;
and the BBU carries out precoding on the downlink signals by utilizing the precoding matrix information.
4. The method of claim 1, further comprising:
and when the EVM is greater than or equal to the preset threshold and the iteration number of the EVM meets a second preset condition, the BBU iteratively updates the precoding matrix information, and the downlink signal is precoded by adopting the updated preset coding matrix information.
5. A method for reducing signal interference, comprising:
a radio remote unit RRU establishes frame synchronization of an uplink signal and a downlink signal between a base band unit BBU and the RRU according to a preset pilot frequency sequence;
the RRU determines Channel State Information (CSI) according to the downlink signal;
the RRU determines an average Error Vector Magnitude (EVM) according to the first pilot frequency sequence and the preset pilot frequency sequence;
the RRU judges whether the EVM meets a first preset threshold or not and sends a judgment result to the BBU;
the first pilot sequence is a pilot sequence obtained by the RRU normalizing the pilot sequence in the downlink signal.
6. The method of claim 5, wherein the RRU determines whether the EVM satisfies a first preset threshold, and sends the determination result to the BBU, and the method includes:
when the EVM is smaller than the first preset threshold, the RRU sends a result that the EVM meets the first preset threshold to the BBU, so that the BBU can update the precoding matrix information;
and when the EVM is greater than or equal to the first preset threshold, the RRU judges whether the iteration number of the EVM is smaller than a second preset threshold.
7. The method of claim 6, wherein the RRU determining whether the number of iterations to calculate the EVM is less than a second preset threshold comprises:
and when the iteration number of the EVM is calculated to be smaller than the second preset threshold, the RRU sends prompt information to the BBU, the prompt information prompts the BBU to update precoding matrix information in an iteration mode, and the downlink signal is precoded by adopting the updated preset coding matrix information.
8. An apparatus for reducing signal crosstalk, applied to a baseband unit BBU, the apparatus comprising:
the processing module is used for establishing frame synchronization of an uplink signal and a downlink signal between the BBU and the RRU according to a preset pilot frequency sequence;
the interface signal enhancement module is used for carrying out MIMO (multiple input multiple output) equalization processing on the uplink signal;
the interface signal enhancement module is further configured to precode a downlink signal sent to the RRU according to channel state information CSI and precoding matrix information sent by the RRU, so that the RRU determines an average error vector magnitude EVM;
when the EVM satisfies a first preset threshold, the interface signal enhancement module is further configured to update the precoding matrix information, so as to precode the downlink signal according to the updated precoding matrix information.
9. An apparatus for reducing signal crosstalk, applied to a Radio Remote Unit (RRU), the apparatus comprising:
the processing module is used for establishing frame synchronization of an uplink signal and a downlink signal between the baseband unit BBU and the RRU according to a preset pilot frequency sequence;
the interface signal enhancement module is used for determining Channel State Information (CSI) according to the downlink signal;
the interface signal enhancement module is further used for determining an average Error Vector Magnitude (EVM) according to the first pilot frequency sequence and the preset pilot frequency sequence;
the first pilot sequence is a pilot sequence obtained by the RRU normalizing the pilot sequence in the downlink signal.
10. An apparatus for reducing signal crosstalk, the apparatus comprising: at least one processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements the method of reducing signal crosstalk of any of claims 1-4 or 5-7.
11. A computer storage medium having computer program instructions stored thereon, which when executed by a processor implement the method of reducing signal crosstalk according to any one of claims 1-4 or 5-7.
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