CN106603447B - Signal channel correction compensation method, device and system - Google Patents
Signal channel correction compensation method, device and system Download PDFInfo
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- CN106603447B CN106603447B CN201510670262.3A CN201510670262A CN106603447B CN 106603447 B CN106603447 B CN 106603447B CN 201510670262 A CN201510670262 A CN 201510670262A CN 106603447 B CN106603447 B CN 106603447B
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H—ELECTRICITY
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
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Abstract
The present invention relates to wireless communication technologies, and in particular, to a method, an apparatus, and a system for signal channel correction and compensation. The method comprises the following steps: the base band unit BBU receives each path of receiving signals from a correction reference channel in the RRU, and each path of receiving signals is signals which are respectively and correspondingly output with each path of transmitting channel after the BBU sends a transmission correction reference signal to each path of transmitting channel in the RRU; the BBU determines the channel time delay of each transmission channel according to each received signal; the BBU takes a transmitting channel corresponding to the minimum channel time delay as a transmitting reference channel, and determines the compensation coefficient of each transmitting channel; the BBU carries out correction compensation on each path of transmitting channel according to the compensation coefficient of each path of transmitting channel; the number of the receiving signals is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels. The signal channel correction compensation method, the device and the system can effectively reduce the intersymbol interference of the received signal.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method, an apparatus, and a system for signal channel correction and compensation.
Background
In a wireless communication system, various types of data signals are transmitted and received through an antenna system. Taking an antenna system adopted in an LTE (Long term evolution) system MIMO (Multiple-Input-Multiple-Output) transmission mode as an example, fig. 1 shows a schematic structural diagram of an antenna system in the prior art. As can be seen from fig. 1, the main structure of the antenna system includes an antenna 1, an RRU2(Radio Remote Unit), and a BBU3(Base Band Unit), where the RRU2 includes multiple signal channels, where each signal channel includes a transmitting channel and a receiving channel. In the process of transmitting signals by the antenna system, in order to ensure higher signal transmission quality, each transmission channel needs to meet certain transmission requirements, for example, the time delay and the phase of each transmission channel are aligned at an empty port, and for example, the ratio of the channel responses of the receiving channel and the transmitting channel of each signal channel is equal.
In an actual antenna system, due to jitter of the intermediate frequency part of a transceiving channel and inconsistency of response of a radio frequency analog device, each transmitting channel is difficult to automatically meet the transmitting requirement. In order to enable each transmission channel to meet the transmission requirement, generally, a calibration reference channel is set in the RRU2, a compensation coefficient of each transmission channel is determined by matching the calibration reference channel with a signal compensation algorithm, and then, each transmission channel is subjected to supplementary correction according to the compensation coefficient of each transmission channel.
After the transmission channel is corrected and compensated by the existing channel correction method, one data segment received from the reception channel sometimes includes Symbol samples in the next data segment, resulting in ISI (Inter-Symbol-Interference).
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, and a system for signal channel correction compensation to effectively reduce inter-symbol interference of a received signal.
In a first aspect, an embodiment of the present invention provides a signal channel correction compensation method, including:
a baseband unit (BBU) receives each path of receiving signals from a correction reference channel in a Radio Remote Unit (RRU), wherein each path of receiving signals is a signal which is respectively and correspondingly output with each path of transmitting channel after the BBU sends a transmission correction reference signal to each path of transmitting channel in the RRU;
the BBU determines the channel time delay of each transmitting channel according to each receiving signal;
the BBU takes a transmitting channel corresponding to the minimum channel time delay as a transmitting reference channel, and determines the compensation coefficient of each transmitting channel;
the BBU carries out correction compensation on each path of transmitting channel according to the compensation coefficient of each path of transmitting channel;
the number of the receiving signals is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels.
Optionally, the determining, by the BBU, the channel delay of each transmit channel according to each received signal includes:
the BBU respectively calculates the frequency domain channel response of each transmitting channel according to the received each receiving signal;
and the BBU determines the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
Optionally, the calculating, by the BBU, the frequency domain channel responses of the transmission channels according to the received reception signals of the channels includes:
the BBU is according to the formula
Respectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx，i(k) The correction reference signal is transmitted to the ith path of transmission channel in the RRU by the BBU; r isrxc，i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmitting channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
Optionally, the determining, by the BBU, a compensation coefficient of each transmission channel by using a transmission channel corresponding to the minimum channel delay as a transmission reference channel includes:
the BBU respectively calculates the initial correction compensation coefficient of each path of transmitting channel according to the frequency domain channel response of each path of transmitting channel;
and the BBU determines the compensation coefficient of each path of transmission channel by taking the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel time delay as a reference.
Optionally, the calculating, by the BBU, the initial correction compensation coefficient of each transmission channel according to the frequency domain channel response of each transmission channel includes:
and the BBU takes the reciprocal of the frequency domain channel response of each path of transmitting channel to obtain the initial correction compensation coefficient of each path of transmitting channel.
Optionally, the determining, by the BBU, the compensation coefficient of each transmission channel by using the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference standard includes:
and the BBU divides the initial correction compensation coefficient of each path of transmitting channel by the initial correction compensation coefficient of the transmitting channel corresponding to the minimum channel time delay to obtain the compensation coefficient of each path of transmitting channel.
Optionally, the BBU is connected with a plurality of RRUs;
the base band unit BBU receives each path of received signals from a calibration reference channel in a radio remote unit RRU, and includes:
the BBU receives each path of receiving signal from the calibration reference channel in each RRU, and each path of receiving signal is a signal which is output by the BBU and corresponds to each path of transmitting channel in the plurality of RRUs after the BBU sends the transmission calibration reference signal to each path of transmitting channel in the plurality of RRUs.
In a second aspect, an embodiment of the present invention provides a signal channel correction compensation apparatus, where the apparatus is disposed in a baseband unit BBU, and includes:
a receiving unit, configured to receive, from a calibration reference channel in a radio remote unit RRU, each path of received signals, where each path of received signals is a signal that is output by the BBU and corresponds to each path of transmission channel in the RRU after the BBU sends a transmission calibration reference signal to each path of transmission channel; the number of the receiving signals of each path is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels;
a channel delay determining unit, configured to determine a channel delay of each transmitting channel according to the received signal;
a compensation coefficient determining unit, configured to determine a compensation coefficient of each transmission channel by using the transmission channel corresponding to the minimum channel delay as a transmission reference channel;
and the correction compensation unit is used for correcting and compensating the transmission channels according to the compensation coefficients of the transmission channels.
Optionally, the channel delay determining unit is specifically configured to calculate, according to the received signals of each channel, frequency domain channel responses of the transmitting channels of each channel respectively; and determining the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
Optionally, the channel delay determining unit is specifically configured to determine the channel delay according to a formula
Respectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx，i(k) The correction reference signal is transmitted to the ith path of transmission channel in the RRU by the BBU; r isrxc，i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmitting channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
Optionally, the compensation coefficient determining unit is specifically configured to calculate initial correction compensation coefficients of the transmission channels according to the frequency domain channel responses of the transmission channels;
and the BBU determines the compensation coefficient of each path of transmission channel by taking the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel time delay as a reference.
Optionally, the compensation coefficient determining unit is specifically configured to take a reciprocal of the frequency domain channel response of each path of transmission channel to obtain an initial correction compensation coefficient of each path of transmission channel.
Optionally, the compensation coefficient determining unit is specifically configured to divide the initial correction compensation coefficient of each path of transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, so as to obtain the compensation coefficient of each path of transmission channel.
Optionally, the BBU is connected with a plurality of RRUs;
the receiving unit is specifically configured to receive, from the calibration reference channel in each RRU, each path of received signals, where each path of received signals is a signal that is output by the BBU and corresponds to each path of transmission channel in the plurality of RRUs after sending a transmission calibration reference signal to each path of transmission channel in the plurality of RRUs.
In a third aspect, an embodiment of the present invention provides an antenna system, including an antenna, a radio remote unit RRU, and a baseband unit BBU;
the RRU comprises a correction reference channel and a plurality of transmission channels, and the correction reference channel is respectively connected with the antenna and the BBU; the multi-channel transmitting channel is connected between the antenna and the BBU in parallel;
the BBU is configured to perform correction compensation on the transmission channels in the RRU, and includes:
the BBU receives each path of receiving signals from a correction reference channel in the RRU, wherein each path of receiving signals is signals which are respectively and correspondingly output with each path of transmitting channel after the BBU sends a transmission correction reference signal to each path of transmitting channel in the RRU;
the BBU determines the channel time delay of each transmitting channel according to each receiving signal;
the BBU takes a transmitting channel corresponding to the minimum channel time delay as a transmitting reference channel, and determines the compensation coefficient of each transmitting channel;
the BBU carries out correction compensation on each path of transmitting channel according to the compensation coefficient of each path of transmitting channel;
the number of the receiving signals is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels.
Optionally, the BBU is specifically configured to calculate frequency domain channel responses of the transmission channels according to the received reception signals of the multiple channels, respectively; and determining the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
Optionally, the BBU is specifically configured to be based on a formulaRespectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx，i(k) Means that the BBU is in the RRUThe correction reference signals are transmitted on the i-path transmitting channels; r isrxc，i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmitting channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
Optionally, the BBU is specifically configured to calculate initial correction compensation coefficients of the transmission channels according to the frequency domain channel responses of the transmission channels; and the method is further specifically configured to determine the compensation coefficient of each path of transmission channel by using the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference.
Optionally, the BBU is specifically configured to obtain an initial correction compensation coefficient of each transmission channel by taking a reciprocal of a frequency domain channel response of each transmission channel.
Optionally, the BBU is specifically configured to divide the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, so as to obtain the compensation coefficient of each transmission channel.
Optionally, the BBU is connected with a plurality of RRUs;
the BBU is specifically configured to receive, from the calibration reference channel in each RRU, each path of received signal, where each path of received signal is a signal that is output by the BBU and corresponds to each path of transmission channel in the plurality of RRUs after the BBU sends a transmission calibration reference signal to each path of transmission channel in the plurality of RRUs.
In a fourth aspect, an embodiment of the present invention provides a signal channel correction compensation apparatus, where the apparatus is deployed in an antenna system, and includes:
a communication interface, a memory, a processor, and a communication bus, wherein the communication interface, the memory, and the processor communicate over the communication bus;
the memory is used for storing programs, and the processor is used for executing the programs stored in the memory; when the Openflow network runs across a topology learning device of a conventional network protocol IP network, the processor runs a program, the program including:
receiving each path of receiving signals from a calibration reference channel in a Radio Remote Unit (RRU), wherein each path of receiving signals is a signal which is respectively and correspondingly output with each path of transmitting channel after the equipment sends a transmission calibration reference signal to each path of transmitting channel in the RRU;
determining the channel time delay of each transmitting channel according to each receiving signal;
determining the compensation coefficient of each path of transmission channel by taking the transmission channel corresponding to the minimum channel time delay as a transmission reference channel;
correcting and compensating the transmitting channels according to the compensation coefficients of the transmitting channels;
the number of the receiving signals is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels.
According to the signal channel correction compensation method, the device, the system and the equipment provided by the embodiment of the invention, when the compensation coefficient of the signal channel is obtained, the transmitting channel corresponding to the minimum channel time delay is taken as the transmitting reference channel, so that the condition that the next segment symbol sampling point is contained in the current receiving segment can be effectively avoided, and the ISI caused by the condition can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of an antenna system in the prior art;
fig. 2 shows another structural schematic of the antenna system;
fig. 3 shows another structural schematic of the antenna system;
fig. 4 shows a further structural schematic of the antenna system;
FIG. 5 shows a schematic diagram of the effect of signal path correction compensation;
FIG. 6 is a flow chart illustrating a signal path correction compensation method according to an embodiment of the present invention;
FIG. 7 is another flow chart of a signal path correction compensation method according to an embodiment of the present invention;
fig. 8 shows a schematic structural diagram of a single cell including multiple RRUs;
FIG. 9 is a flow chart of a signal path correction compensation method according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, an antenna system used in an LTE system MIMO transmission mode is taken as an example, and a signal channel correction method according to the embodiment of the present invention is described in detail.
On the basis of the structure of the antenna system of fig. 1, fig. 2 shows another structure diagram of the antenna system.
As can be seen from fig. 2, the main structure of the antenna system includes an antenna 1, an RRU2 and a BBU3, where the RRU2 includes multiple signal channels, each of which includes a receiving channel and a transmitting channel, and the RRU2 in the antenna system shown in fig. 2 includes four signal channels, for example, the 0 th signal channel includes a transmitting channel and a receiving channel, where the transmitting channel includes a transmitting circuit TX0, and the transmitting circuit TX0 is connected to a TRX0 of the BBU3 through a Common Public Radio Interface (CPRI), and is connected to the antenna 1 through a parallel module; the receiving channel includes a receiving circuit RX0, and the receiving circuit RX0 is connected to the transceiver interface TRX0 of the BBU3 through the CPRI, and is connected to the antenna 1 through the parallel module.
In fig. 2, the combining module is an electronic device for separating the receiving channel and the transmitting channel, and may be specifically a duplexer, a switching circuit, a circulator, or the like.
The connection structure of the other signal channels included in RRU2 is the same as that of the 0 th signal channel, and is not described in detail again.
The LTE system uses the antenna system shown in fig. 2 to perform MIMO transmission in two ways, which are BF (Beamforming) transmission and CL-MIMO (Closed-Loop MIMO) transmission, and the BF transmission and the CL-MIMO transmission perform weighted transmission on the base station side, so that signals of multiple transmitting antennas 1 form coherent superposition when being received, thereby obtaining array gain and improving SINR (Signal to Interference noise Ratio) of a user.
In both BF transmission technology and CL-MIMO transmission technology, the transmission channel in the antenna system needs to satisfy a certain transmission condition in order to obtain a higher transmission quality.
For example, the CL-MIMO transmission technology requires that the delay and phase of each transmission channel are aligned at the air interface, and the formula is as follows:
htx，0(k)＝htx，1(k)＝…＝htx，3(k)
in the above formula, htx，0(k)～htx，3(k) Respectively representing the frequency domain channel responses of a transmitting channel 0-a transmitting channel 3, k representing the frequency domain subcarrier number, and the value range from 0 to Nfft-1, wherein Nfft is the total number of the frequency domain subcarriers.
Or in the CL-MIMO transmission technology, the consistency of the response of the transmission channel is achieved by time delay or frequency domain compensation, and the formula is as follows:
βtx，0×htx，0(k)＝βtx，1×htx，1(k)＝…＝βtx，3×htx，3(k)
wherein, betatx，0～βtx，3The correction compensation coefficients of the transmission channels 0 to 3 are respectively expressed.
For another example, in the BF transmission technology, it is required that the ratio of the channel responses of each receiving channel and each transmitting channel is equal, that is, the formula is satisfied:
wherein h isrx，0(k)～hrx，3(k) Respectively representing the frequency domain channel responses of a receiving channel 0-a receiving channel 3, k representing the frequency domain subcarrier number, and the value range from 0 to Nfft-1, wherein Nfft is the total number of the frequency domain subcarriers.
Or in BF transmission technology, the response consistency of the transmission channel is achieved by compensating in time delay or frequency domain, namely according to the satisfied formula
Wherein, betatx，0～βtx，3Respectively represents the correction compensation coefficients, beta, of the transmission channels 0 to 3rx，0～βrx，3The correction compensation coefficients of the reception channels 0 to 3 are shown, respectively.
Due to the jitter of the intermediate frequency part FIFO (First In First Out) of the transceiving channel and the inconsistency of the response of the radio frequency analog device, the alignment of the channel itself cannot be guaranteed under the condition of not performing frequency domain or time domain channel compensation, so a correction compensation coefficient needs to be obtained through a channel compensation algorithm and hardware design.
The method for acquiring the correction compensation coefficient in the embodiment of the invention comprises designing an additional correction reference channel 4.
As shown in fig. 3, another schematic structural diagram of the antenna system is shown, in order to obtain a correction compensation coefficient of a signal channel, a coupling circuit 5 and a correction reference channel 4 are added in the structure of the antenna system, specifically, the coupling circuit 5 is disposed inside the antenna, which belongs to an external correction method, under the correction method, a transmission channel includes a TX (transmit) circuit and a feeder 6 inside an RRU2, and a reception channel includes an RX (receive) circuit and a feeder 6 inside an RRU2, for example, the 0 th transmission channel includes a transmission circuit TX0 and a feeder 6, and the 0 th reception channel includes a reception circuit RX0 and a feeder 6, in this way, the coupling circuit 5 is disposed inside the antenna, and can complete the correction of the TX circuit and the feeder.
Fig. 4 shows another schematic structural diagram of an antenna system, and different from fig. 3, in this way, the additional coupling circuit 5 in the antenna system is disposed inside an RRU, which belongs to an internal correction method, under this correction method, a transmitting channel includes a TX circuit inside an RRU2, a receiving channel includes an RX circuit inside an RRU2, for example, the 0 th transmitting channel includes a transmitting circuit TX0, and the 0 th receiving channel includes a receiving circuit RX 0. In this way, the coupling circuit is arranged inside the RRU, and signals are led from the RRU outlet (inside) to the coupling circuit 5 to complete the correction of the TX circuit, and the external feeder can only be guaranteed by construction constraints.
In fig. 3 and 4, the coupling circuit 5 may be a circuit formed by a power splitter/combiner, wherein the coupling circuit 5 in fig. 4 is connected to the output end of each transmitting channel through a directional coupler.
In fig. 3 and 4, the calibration reference channel 4 includes a transmitting circuit TXc and a receiving circuit RXc, wherein the BBU3 sends and receives a calibration reference signal to the transmitting circuit TXc, and after passing through the coupling circuit 5 and the antenna 1, the BBU3 receives a feedback signal from each receiving channel of the RRU2, and obtains a compensation coefficient of each receiving channel according to the feedback signal.
The receiving circuit RXc in the calibration reference channel 4 is configured to receive the signal output by the coupling circuit 5, and output the received signal to the BBU3, so that the BBU3 corrects each transmitting channel in the RRU according to the received signal, and the following detailed description will be made on the correcting process of the transmitting channel, which is not repeated herein.
Although the ranges defined by the transmitting channel and the receiving channel are different in the two antenna systems shown in fig. 3 and fig. 4, the method for implementing the signal channel correction provided by the embodiment of the present invention is the same, and the signal channel correction compensation method according to the embodiment of the present invention will be described in detail below by taking the antenna system shown in fig. 3 as an example.
When the antenna system shown in fig. 3 is used for correcting the transmission channel, the BBU3 controls the start of correction, and transmits a transmission correction reference signal to each transmission channel, in fig. 3, the BBU3 transmits the transmission correction reference signal to the transmission circuit TX0 through the transceiving interface TRX0, transmits the transmission correction reference signal to the transmission circuit TX1 through the transceiving interface TRX1, transmits the transmission correction reference signal to the transmission circuit TX2 through the transceiving interface TRX2, and transmits the transmission correction reference signal to the transmission circuit TX3 through the transceiving interface TRX 3. In the method, the BBU3 may send the transmission correction reference signal to the transmission channel by using frequency division, time division, or space division.
The transmission correction reference signals sent by the BBU3 to the four transmission channels are aggregated by the coupling circuit 5 and then transmitted to the correction reference channel 4, the BBU3 receives the receiving information corresponding to each transmission channel from the correction reference channel, and it is assumed that the signals of each receiving channel are rrxc,0(k)，rrxc,1(k),rrxc,2(k),rrxc,3(k) The frequency domain channel response of each path of emission channel can be obtained through LS (Least mean Square) channel estimation, wherein the formula of the LS channel estimation is as follows:
wherein the content of the first and second substances,
estimating the response, r, for the frequency domain channel of the ith transmit channelrxc,i(k) For the i-th received signal received via the calibration reference channel 4, stx,i(k) And correcting the reference signal for the ith path transmitted by the BBU3, wherein in the antenna system shown in FIG. 3, the value of i is 0-3.
The above formula for LS channel estimation is simplified as:
wherein h isrxc(k) To correct the channel response of the reference receive channel; h istx,i(k) The channel response of the channel is transmitted for the ith path.
By for each
Taking the reciprocal to obtain the initial correction compensation coefficient, i.e. according to the formulaDetermining an initial correction compensation factor for the ith transmit channel, wherein
Before calculating the initial correction compensation coefficient, the method can be used for
Noise reduction processing is performed to improve the accuracy of the acquired initial correction compensation coefficient.
Further, in order to avoid introducing extra time delay caused by the correction reference channel 4, after the initial correction compensation coefficient is obtained, a transmission channel is used as a reference to perform relative correction on each obtained correction compensation coefficient, and a channel 0 is generally used as a reference to perform relative correction, that is:
since the delay difference between the RRU2 channels is small, using channel 0 as the reference does not bring a big problem, but special consideration needs to be taken when an individual RRU2 or an RRU2 is dually combined to form a single cell.
As shown in fig. 5, which is a schematic diagram illustrating the effect of signal channel correction compensation, it can be seen from the diagram that when channel 0 is used as a reference, the correction compensation method that channel 0 can adopt includes: reciprocal compensation, minimum delay compensation and maximum delay compensation; when the maximum delay channel is used as a reference for relative correction, a symbol sample of the next OFDM (Orthogonal Frequency Division Multiplexing) is received in the current OFDM data at the receiving end, which results in ISI.
In order to solve the above problem, an embodiment of the present invention provides a signal channel correction compensation method, where when obtaining a compensation coefficient of a signal channel, a transmission channel corresponding to a minimum channel delay is used as a transmission reference channel, so as to effectively avoid a situation that a next segment symbol sample point is included in a current receiving segment, and avoid ISI caused by the situation.
Fig. 6 shows a flowchart of a signal channel correction compensation method according to an embodiment of the present invention, where an execution subject of the method is a BBU, and main processing steps include:
step S11: and the BBU receives each path of received signals from a correction reference channel in the RRU.
Each path of receiving signal is a signal which is output by the BBU corresponding to each path of transmitting channel after the BBU sends the transmission correction reference signal to each path of transmitting channel in the RRU.
Specifically, the number of the receiving signals in each path is a positive integer greater than 1, and the number of the receiving signals is equal to the number of the transmitting channels.
Specifically, the specific process of the BBU receiving each path of received signals from the calibration reference channel in the RRU includes:
(1) and the BBU sends a transmission correction reference signal to each path of transmission channel in the RRU.
As in fig. 3, the BBU3 transmits transmission correction reference signals to the transmission circuit TX0 and the transmission circuit TX1 … …, respectively, and the transmission circuit TX 3.
(2) And the BBU receives the receiving signals corresponding to the transmitting channels one by one from the correction reference channel in the RRU.
As in fig. 3, the BBU3 receives the respective reception signals from the reception circuits RXc of the corrected reference channels.
Step S12: and the BBU determines the channel time delay of each transmitting channel according to each path of receiving signals.
Step S13: and the BBU takes the transmitting channel corresponding to the minimum channel time delay as a transmitting reference channel, and determines the compensation coefficient of each transmitting channel.
Step S14: and the BBU carries out correction compensation on each path of transmitting channel according to the compensation coefficient of each path of transmitting channel.
As can be seen from fig. 5, in the embodiment of the present invention, when the transmission channel corresponding to the minimum channel delay is used as the transmission reference channel, the occurrence of a situation that the current receiving segment includes a next segment symbol sampling point can be effectively avoided, and ISI caused by the situation can be avoided.
Fig. 7 shows another flowchart of the signal channel correction compensation method according to the embodiment of the present invention, where an execution subject of the method is a BBU, and the main processing steps include:
step S21: and the BBU sends a transmission correction reference signal to each path of transmission channel in the RRU.
Step S22: and the BBU receives the receiving signals corresponding to the transmitting channels one by one from the correction reference channel in the RRU.
Step S23: and the BBU respectively calculates the frequency domain channel response of each path of transmitting channel according to the received receiving signals.
The BBU calculates the frequency domain channel response of each transmission channel according to each received signal, including:
BBU is according to the formula
Respectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx,i(k) The correction reference signal is transmitted to an ith transmission channel in the RRU by the BBU; r isrxc,i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmission channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
The formula is simplified as:
wherein h isrxc(k) To correct the channel response of the reference receive channel; h istx,i(k) The channel response of the channel is transmitted for the ith path.
Step S24: and the BBU determines the channel time delay of each transmission channel according to the frequency domain channel response of each transmission channel.
In this step, the channel time delay of each path of transmitting channel in the time domain is determined according to the frequency domain channel response value.
Step S25: and the BBU respectively calculates the initial correction compensation coefficient of each transmission channel according to the frequency domain channel response of each transmission channel.
Specifically, the BBU obtains the reciprocal of the frequency domain channel response of each transmission channel to obtain the initial correction compensation coefficient of each transmission channel.
BBU in this step is according to formula
Determining an initial correction compensation factor for the ith transmit channel, wherein
Before calculating the initial correction compensation coefficient, the method can be used for
And performing noise reduction processing to improve the accuracy of the acquired initial correction compensation coefficient.
Step S26: and the BBU determines the compensation coefficient of each path of transmission channel by taking the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel time delay as a reference.
And the BBU divides the initial correction compensation coefficient of each path of transmitting channel by the initial correction compensation coefficient of the transmitting channel corresponding to the minimum channel time delay to obtain the compensation coefficient of each path of transmitting channel.
Step S27: and the BBU carries out correction compensation on each path of transmitting channel according to the compensation coefficient of each path of transmitting channel.
The above-described methods of the first embodiment and the second embodiment of the present invention may be applied to an antenna system with a single cell and a single RRU, or may be applied to an antenna system with a single cell and multiple RRUs, for example, as shown in fig. 8, one antenna system includes two RRUs, where each RRU may include two signal channels.
When a single cell comprises a plurality of RRUs, the plurality of RRUs are all connected with the BBU in the cell; when correcting the transmitting channels in the plurality of RRUs, the BBU receives each path of receiving signals from the correction reference channel in each RRU, wherein each path of receiving signals is a signal which is respectively and correspondingly output with each path of transmitting channel in the plurality of RRUs after the BBU sends the transmission correction reference signal to each path of transmitting channel in the plurality of RRUs.
After the BBU receives the received signal output by each RRU, the correction compensation coefficients of each transmission channel are calculated according to the method in the first embodiment or the second embodiment, and the calculation method of the correction compensation coefficients is the same as that in the first embodiment or the second embodiment, and is not described again.
Fig. 9 shows another flowchart of the signal channel correction compensation method according to the embodiment of the present invention, where the main execution unit of the method is BBU, and the main processing steps include:
step S31: when the RRU is started, the channel response of the transmitting and receiving channels fluctuates due to the change of temperature, humidity and the like in the channels inside the RRU.
Step S32: and the BBU judges whether the RRU starting time exceeds X minutes.
And in consideration of the fluctuation of channel responses of the RRU transmitting channel and the receiving channel, starting channel correction after the BBU waits for the channel responses to be stable. That is, the BBU determines whether the RRU start time exceeds x minutes, and if so, it means that the channel response has been stabilized, and channel correction can be performed.
Step S33: and triggering RRU transmission channel correction by the BBU.
The BBU sends transmission correction reference signals to a plurality of transmission channels, specifically, the transmission correction reference signals may be sent in a plurality of ways such as time division, frequency division, or code division, and the transmission correction reference signals pass through the RRU, pass through the antenna, and loop back to the correction reference receiving channel from the coupling circuit (sometimes, the coupling circuit directly loops back from the inside of the RRU without passing through the antenna, the processing flow is not different, and is not separately described), the BBU performs LS channel estimation on the received signals obtained from the correction reference receiving channel, performs LS channel estimation after optionally performing operations such as noise reduction filtering, and obtains initial transmission correction coefficients of each transmission channel by using the result of the LS channel estimation, where the initial transmission correction coefficients are the reciprocal of the channel estimation.
Step S34: and the BBU obtains the channel time delay of each transmitting channel according to the obtained LS channel estimation value, takes the channel with the minimum channel time delay as a transmitting reference channel, and uses the initial transmitting correction coefficient of the reference channel as a normalization factor to perform relative correction processing on the initial transmitting correction coefficient, namely all the initial transmitting correction coefficients are divided by the initial transmitting correction coefficient of the reference channel to obtain a second correcting compensation coefficient.
The calculation methods of the initial correction compensation coefficient and the second correction compensation coefficient in steps S33 and S34 are the same as those listed in the second embodiment, and are not repeated.
Step S35: and the BBU triggers the RRU receiving channel to correct.
The BBU sends and receives a correction reference signal to a transmitting channel in the correction reference channel, the correction reference signal passes through the RRU and an antenna, and is looped back to a plurality of receiving channels in the RRU from a coupling circuit (sometimes the coupling circuit is directly looped back from the inside of the RRU without passing through the antenna, the processing flow is not different, and is not separately described), the BBU performs LS channel estimation on the received signal obtained from each receiving channel in the RRU, optionally performs LS channel estimation after performing operations such as noise reduction filtering on the received signal, and the like, and then the BBU determines an initial receiving correction coefficient of each receiving channel by using an LS channel estimation result of each receiving channel in the RRU, wherein the initial receiving correction coefficient is the reciprocal of the channel estimation. (FDD System may not have this step)
Step S36: the BBU takes channel 0 (which can be taken at will) as a receiving reference channel according to the obtained LS channel estimation value, and performs relative correction processing on the initial transmitting correction coefficient by using the initial receiving correction coefficient of the receiving reference channel as a normalization factor, namely all the initial receiving correction coefficients are divided by the initial receiving correction coefficient of the reference channel to obtain a second receiving correction coefficient; (FDD System may not have this step)
After the initial correction is completed, the channel with the minimum channel time delay is selected as a reference channel to carry out relative correction, so that ISI (inter-symbol interference) caused by correction compensation is avoided.
Fig. 10 shows a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention, where the apparatus is disposed in a baseband unit BBU, and includes: a receiving unit 41, a channel delay determining unit 42, a compensation coefficient determining unit 43, and a correction compensating unit 44;
the receiving unit 41 is configured to receive, from a calibration reference channel in a radio remote unit RRU, each path of received signals, where each path of received signals is a signal that is output by a BBU corresponding to each path of transmission channel after transmitting the calibration reference signal to each path of transmission channel in the RRU; the number of the receiving signals of each path is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels;
a channel delay determining unit 42, configured to determine a channel delay of each transmit channel according to each received signal;
a compensation coefficient determining unit 43, configured to determine a compensation coefficient of each transmission channel by using the transmission channel corresponding to the minimum channel delay as a transmission reference channel;
and the correction compensation unit 44 is configured to perform correction compensation on each transmission channel according to the compensation coefficient of each transmission channel.
In the above embodiment, the channel delay determining unit 42 is specifically configured to calculate frequency domain channel responses of the transmitting channels according to the received receiving signals of the channels respectively; and determining the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
In the above embodiment, the channel delay determining unit 42 is specifically configured to follow the formula
Respectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx,i(k) The correction reference signal is transmitted to an ith transmission channel in the RRU by the BBU; r isrxc,i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmission channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
In the above embodiment, the compensation coefficient determining unit 43 is specifically configured to calculate the initial correction compensation coefficient of each transmission channel according to the frequency domain channel response of each transmission channel;
and the BBU determines the compensation coefficient of each path of transmission channel by taking the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel time delay as a reference.
In the foregoing embodiment, the compensation coefficient determining unit 43 is specifically configured to take the reciprocal of the frequency domain channel response of each transmission channel to obtain the initial correction compensation coefficient of each transmission channel.
In the above embodiment, the compensation coefficient determining unit 43 is specifically configured to divide the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, so as to obtain the compensation coefficient of each transmission channel.
In the above embodiment, the BBU is connected with a plurality of RRUs;
the receiving unit 41 is specifically configured to receive, from the calibration reference channel in each RRU, each path of received signals, where each path of received signals is a signal that is output by the BBU and corresponds to each path of transmitting channel in the plurality of RRUs after transmitting the calibration reference signal to each path of transmitting channel in the plurality of RRUs.
Fig. 3 shows a schematic structural diagram of an antenna system according to an embodiment of the present invention, which includes an antenna 1, an RRU2, and a BBU 3;
the RRU2 includes a calibration reference channel and multiple transmission channels, and the calibration reference channel is connected to the antenna and the BBU 3; the multipath transmitting channels are connected between the antenna and the BBU3 in parallel;
the BBU3 is configured to perform correction compensation on each transmit channel in the RRU2, and includes:
the BBU3 receives each path of received signals from a calibration reference channel in the RRU2, where each path of received signals is a signal that is output by the BBU3 and corresponds to each path of transmission channel after transmitting the calibration reference signal to each path of transmission channel in the RRU 2;
the BBU3 determines the channel time delay of each transmission channel according to each received signal;
the BBU3 determines the compensation coefficient of each path of transmission channel by using the transmission channel corresponding to the minimum channel delay as a transmission reference channel;
the BBU3 corrects and compensates each path of transmitting channel according to the compensation coefficient of each path of transmitting channel;
the number of the receiving signals is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels.
In the foregoing embodiment, the BBU3 is specifically configured to calculate frequency domain channel responses of the transmission channels according to the received signals; and determining the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
In the above embodiments, BBU3 is specifically used according to the formula
Respectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx,i(k) The correction reference signal transmitted by the BBU3 to the ith transmission channel in the RRU2 is represented; r istxc,i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmission channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
In the foregoing embodiment, the BBU3 is specifically configured to calculate initial correction compensation coefficients of each transmission channel according to frequency domain channel responses of each transmission channel; and the method is further specifically used for determining the compensation coefficient of each path of transmission channel by taking the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference.
In the foregoing embodiment, the BBU3 is specifically configured to obtain an initial correction compensation coefficient for each transmission channel by taking a reciprocal of a frequency domain channel response of each transmission channel.
In the foregoing embodiment, the BBU3 is specifically configured to divide the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, so as to obtain the compensation coefficient of each transmission channel.
In the above embodiment, the BBU3 has connected thereto a plurality of RRUs 2;
the BBU3 is specifically configured to receive, from the calibration reference channel in each RRU2, each path of received signals, where each path of received signals is a signal that is output by the BBU3 and corresponds to each path of transmission channel in the plurality of RRUs 2 after sending a transmission calibration reference signal to each path of transmission channel in the plurality of RRUs 2.
Fig. 11 shows a schematic structural diagram of a signal channel correction and compensation device according to an embodiment of the present invention, the device is deployed in an antenna system, the signal channel correction and compensation device 1100 includes a communication interface 1101, a memory 1103, and a processor 1102, wherein the communication interface 1101, the processor 1102, the memory 1103 are connected to each other through a bus 1104; the bus 1104 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 11, but this is not intended to represent only one bus or type of bus.
The communication interface 1101 is used for communication with a transmitting end. A memory 1103 for storing programs. In particular, the program may include program code including computer operating instructions. The memory 1103 may include a Random Access Memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 1102 executes the program stored in the memory 1103 to implement the method according to the foregoing method embodiment of the present invention:
the method comprises the following steps:
receiving each path of receiving signals from a correction reference channel in a Radio Remote Unit (RRU), wherein each path of receiving signals are signals which are respectively and correspondingly output with each path of transmitting channel after equipment sends a transmission correction reference signal to each path of transmitting channel in the RRU;
determining the channel time delay of each transmitting channel according to each received signal;
determining a compensation coefficient of each path of transmission channel by taking the transmission channel corresponding to the minimum channel time delay as a transmission reference channel;
correcting and compensating each path of transmitting channel according to the compensation coefficient of each path of transmitting channel;
the number of the receiving signals is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels.
The Processor 1102 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.
According to the signal channel correction compensation method, the device, the system and the equipment provided by the embodiment of the invention, when the compensation coefficient of the signal channel is obtained, the transmitting channel corresponding to the minimum channel time delay is taken as the transmitting reference channel, so that the condition that the next segment symbol sampling point is contained in the current receiving segment can be effectively avoided, and the ISI caused by the condition can be avoided.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (15)
1. A method for signal path correction compensation, comprising:
a baseband unit (BBU) receives each path of receiving signals from a correction reference channel in a Radio Remote Unit (RRU), wherein each path of receiving signals is a signal which is respectively and correspondingly output with each path of transmitting channel after the BBU sends a transmission correction reference signal to each path of transmitting channel in the RRU;
the BBU determines the channel time delay of each transmitting channel according to each receiving signal;
the BBU takes a transmitting channel corresponding to the minimum channel time delay as a transmitting reference channel, and determines the compensation coefficient of each transmitting channel;
the BBU carries out correction compensation on each path of transmitting channel according to the compensation coefficient of each path of transmitting channel;
the number of the receiving signals of each path is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels;
the BBU takes a transmitting channel corresponding to the minimum channel delay as a transmitting reference channel, and determines the compensation coefficient of each transmitting channel, including:
the BBU respectively calculates the initial correction compensation coefficient of each path of transmitting channel according to the frequency domain channel response of each path of transmitting channel;
the BBU takes the initial correction compensation coefficient of the transmitting channel corresponding to the minimum channel time delay as a reference standard to determine the compensation coefficient of each transmitting channel;
the BBU calculates the initial correction compensation coefficient of each transmission channel according to the frequency domain channel response of each transmission channel, including:
and the BBU takes the reciprocal of the frequency domain channel response of each path of transmitting channel to obtain the initial correction compensation coefficient of each path of transmitting channel.
2. The method of claim 1, wherein the determining, by the BBU, the channel delay of each transmit channel according to the received signal comprises:
the BBU respectively calculates the frequency domain channel response of each transmitting channel according to the received each receiving signal;
and the BBU determines the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
3. The method of claim 2, wherein the BBU calculates the frequency domain channel responses of the transmit channels according to the received receive signals, respectively, and includes:
the BBU is according to the formulaRespectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx，i(k) The correction reference signal is transmitted to the ith path of transmission channel in the RRU by the BBU; r isrxc，i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmitting channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
4. The method of claim 1, wherein the determining, by the BBU, the compensation coefficient of each transmit channel with an initial correction compensation coefficient of a transmit channel corresponding to a minimum channel delay as a reference, includes:
and the BBU divides the initial correction compensation coefficient of each path of transmitting channel by the initial correction compensation coefficient of the transmitting channel corresponding to the minimum channel time delay to obtain the compensation coefficient of each path of transmitting channel.
5. The method of any one of claims 1-4, wherein a plurality of RRUs are connected to the BBU;
the base band unit BBU receives each path of received signals from a calibration reference channel in a radio remote unit RRU, and includes:
the BBU receives each path of receiving signal from the calibration reference channel in each RRU, and each path of receiving signal is a signal which is output by the BBU and corresponds to each path of transmitting channel in the plurality of RRUs after the BBU sends the transmission calibration reference signal to each path of transmitting channel in the plurality of RRUs.
6. A signal path correction compensation apparatus, disposed in a baseband unit BBU, comprising:
a receiving unit, configured to receive, from a calibration reference channel in a radio remote unit RRU, each path of received signals, where each path of received signals is a signal that is output by the BBU and corresponds to each path of transmission channel in the RRU after the BBU sends a transmission calibration reference signal to each path of transmission channel; the number of the receiving signals of each path is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels;
a channel delay determining unit, configured to determine a channel delay of each transmitting channel according to the received signal;
a compensation coefficient determining unit, configured to determine a compensation coefficient of each transmission channel by using the transmission channel corresponding to the minimum channel delay as a transmission reference channel;
the correction compensation unit is used for correcting and compensating the transmission channels according to the compensation coefficients of the transmission channels;
the compensation coefficient determining unit is specifically configured to calculate initial correction compensation coefficients of the transmission channels according to the frequency domain channel responses of the transmission channels;
determining the compensation coefficient of each path of transmission channel by taking the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel time delay as a reference standard;
the compensation coefficient determining unit is specifically configured to take the reciprocal of the frequency domain channel response of each transmission channel to obtain an initial correction compensation coefficient of each transmission channel.
7. The apparatus according to claim 6, wherein the channel delay determining unit is specifically configured to calculate, according to the received signals, frequency domain channel responses of the transmitting channels respectively; and determining the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
8. The arrangement according to claim 7, characterized in that said channel delay determining unit is specifically adapted to follow a formula
Respectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx，i(k) The correction reference signal is transmitted to the ith path of transmission channel in the RRU by the BBU; r isrxc，i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmitting channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
9. The apparatus of claim 6, wherein the compensation coefficient determining unit is specifically configured to divide the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay to obtain the compensation coefficient of each transmission channel.
10. The apparatus of any one of claims 6-9, wherein a plurality of RRUs are connected to the BBU;
the receiving unit is specifically configured to receive, from the calibration reference channel in each RRU, each path of received signals, where each path of received signals is a signal that is output by the BBU and corresponds to each path of transmission channel in the plurality of RRUs after sending a transmission calibration reference signal to each path of transmission channel in the plurality of RRUs.
11. An antenna system is characterized by comprising an antenna, a Radio Remote Unit (RRU) and a baseband unit (BBU);
the RRU comprises a correction reference channel and a plurality of transmission channels, and the correction reference channel is respectively connected with the antenna and the BBU; the multi-channel transmitting channel is connected between the antenna and the BBU in parallel;
the BBU is configured to perform correction compensation on the transmission channels in the RRU, and includes:
the BBU receives each path of receiving signals from a correction reference channel in the RRU, wherein each path of receiving signals is signals which are respectively and correspondingly output with each path of transmitting channel after the BBU sends a transmission correction reference signal to each path of transmitting channel in the RRU;
the BBU determines the channel time delay of each transmitting channel according to each receiving signal;
the BBU takes a transmitting channel corresponding to the minimum channel time delay as a transmitting reference channel, and determines the compensation coefficient of each transmitting channel;
the BBU carries out correction compensation on each path of transmitting channel according to the compensation coefficient of each path of transmitting channel;
the number of the receiving signals of each path is a positive integer greater than 1, and the number of the receiving signals is equal to that of the transmitting channels;
the BBU is specifically configured to calculate initial correction compensation coefficients of the transmission channels according to the frequency domain channel responses of the transmission channels; the method is further specifically configured to determine the compensation coefficient of each path of transmission channel by using the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference;
the BBU is specifically configured to obtain an initial correction compensation coefficient of each transmission channel by taking a reciprocal of a frequency domain channel response of each transmission channel.
12. The system according to claim 11, wherein the BBU is specifically configured to calculate frequency domain channel responses of the transmission channels according to the received reception signals; and determining the channel time delay of each transmitting channel according to the frequency domain channel response of each transmitting channel.
13. System according to claim 12, wherein said BBU is specifically adapted to follow a formula
Respectively calculating the frequency domain channel response of each path of transmitting channel;
wherein s istx，i(k) The correction reference signal is transmitted to the ith path of transmission channel in the RRU by the BBU; r isrxc，i(k) Indicating a received signal which is received by the correction reference channel and corresponds to the ith transmitting channel; k represents the number of the frequency domain subcarriers, the value range of k is from 0 to N-1, and N is the total number of the frequency domain subcarriers; the value range of i is 0 to reduce the total number of the transmitting channels in the RRU by one; i and k are integers which are more than or equal to 0, and N is a positive integer.
14. The system according to claim 11, wherein the BBU is specifically configured to divide the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay to obtain the compensation coefficient of each transmission channel.
15. The system according to any one of claims 11-14, wherein a plurality of RRUs are connected to the BBU;
the BBU is specifically configured to receive, from the calibration reference channel in each RRU, each path of received signal, where each path of received signal is a signal that is output by the BBU and corresponds to each path of transmission channel in the plurality of RRUs after the BBU sends a transmission calibration reference signal to each path of transmission channel in the plurality of RRUs.
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| PCT/CN2016/100069 WO2017063497A1 (en) | 2015-10-15 | 2016-09-26 | Signal channel correction compensation method, apparatus and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2494703A1 (en) * | 2009-10-29 | 2012-09-05 | Telefonaktiebolaget LM Ericsson (publ) | Method and arrangement in a communication system |
| CN102891708A (en) * | 2012-09-17 | 2013-01-23 | 华为技术有限公司 | Correction method, device and system for transceiving channel response, and base band unit (BBU) |
| CN104468425A (en) * | 2013-09-13 | 2015-03-25 | 华为技术有限公司 | Channel correction method, device and system for remote radio units |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2494703A1 (en) * | 2009-10-29 | 2012-09-05 | Telefonaktiebolaget LM Ericsson (publ) | Method and arrangement in a communication system |
| CN102891708A (en) * | 2012-09-17 | 2013-01-23 | 华为技术有限公司 | Correction method, device and system for transceiving channel response, and base band unit (BBU) |
| CN104468425A (en) * | 2013-09-13 | 2015-03-25 | 华为技术有限公司 | Channel correction method, device and system for remote radio units |
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