CN114760683B - Method and device suitable for 5G ORAN downlink phase compensation - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
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- H04L27/26—Systems using multi-frequency codes
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Abstract
The invention discloses a method suitable for 5G ORAN downlink phase compensation, which comprises the following steps: calculating phase compensation of the IQ data in a down-conversion frequency domain, calculating parameters to be compensated for each OFDM symbol in one frame of data under the current configured frequency point through Cortex A53, determining each OFDM symbol and the parameters calculated by the phase compensation through control signals related to OFDM, obtaining new IQ data through the phase compensation, and outputting corresponding data. The method for realizing the phase compensation of the 5G remote radio unit in the downlink is realized in a simpler and more flexible way through the online configuration of the compensation parameters, so that the method can be quickly realized in engineering. The invention also provides a 5G ORAN downlink phase compensation device.
Description
Technical Field
The invention relates to the field of communication networks, in particular to a method and a device suitable for 5G ORAN downlink phase compensation.
Background
According to the relevant protocol of 3GPP, OFDM signals except PARCH channel are up-converted to f after being formed 0 Phase compensation is required before transmission; and carrying out phase compensation on the OFDM symbols one by one to a specific position related to the related frequency point, and solving the phase rotation problem caused by inconsistent central frequency points of the transmitting end and the receiving end. The existing mode realizes the phase compensation of the whole downlink through the FPGA, and has the advantages of long development period, high cost and large logic resource consumed by devices.
Disclosure of Invention
(one) solving the technical problems
The method for realizing the phase compensation of the 5G radio frequency unit in the downlink is realized in a simpler and more flexible way so as to be quickly realized in engineering.
(II) technical scheme
In order to solve the technical problems and achieve the aim of the invention, the invention is realized by the following technical scheme:
a method for 5G ora downstream phase compensation, comprising the steps of:
s1: the phase compensation of the IQ data in the down-conversion frequency domain is calculated, and the calculation method is as follows:
wherein f0 is carrier frequency, μ is subcarrier spacing configuration;
for any physical channel or signal other than PRACH, OFDM symbols in a subframe
Time-continuous signal on antenna port +.>
And subcarrier spacing configuration μ is defined as follows:
wherein, the delta f takes the value as shown in the following table, and mu is the interval configuration of subcarriers; mu (mu) 0 For the maximum μ value in the subcarrier spacing configuration determined by the higher layer parameter scspeccarrier list
| μ | △f＝2 μ ·15[kHz] |
| 0 | 15 |
| 1 | 30 |
| 2 | 60 |
| 3 | 120 |
| 4 | 240 |
The starting position of the OFDM symbol for subcarrier spacing configuration in a subframe is given by:
s2: the parameter to be compensated for the phase corresponding to each OFDM symbol in a frame of data at the current configured frequency point is calculated by Cortex a53, specifically as follows:
calculating coefficients of 14 OFDM symbols in each subframe to be subjected to phase compensation according to frequency points and subcarrier intervals configured by a user and the following formulas, wherein the coefficients are respectively recorded as: IP 0-IP 13, QP 0-QP 13 and giving the parameters to the PL terminal through AXI;
wherein,,
is the PRACH transmission opportunity in PRACH time slot, from 0 to +.>
S3: determining parameters of each OFDM symbol and phase compensation calculation by control signals related to OFDM;
the 28 parameters obtained from ARM are combined with 14 OFDM symbols in each subframe: IQ data of ofdm0 to ofdm13 respectively correspond to IP0 to IP13 and QP0 to QP13 to perform complex operation;
s4: and S3, obtaining an operation result which is new IQ data obtained through phase compensation, and outputting corresponding data.
The invention also provides a device suitable for 5G ORAN downlink phase compensation, which specifically comprises:
the IQ data calculation module is used for calculating phase compensation of IQ data in a down-conversion frequency domain, and the calculation method comprises the following steps:
wherein f0 is carrier frequency, μ is subcarrier spacing configuration;
the compensation parameter calculation module is used for calculating parameters to be compensated for corresponding to each OFDM symbol phase in one frame of data under the current configured frequency point through Cortex A53; determining parameters of each OFDM symbol and phase compensation calculation by control signals related to OFDM;
and the output module is used for outputting the new IQ data obtained by compensation.
Further, the parameter mode for calculating the phase to be compensated corresponding to each OFDM symbol in a frame of data at the current configured frequency point is as follows:
calculating coefficients of 14 OFDM symbols in each subframe to be subjected to phase compensation according to frequency points and subcarrier intervals configured by a user and the following formulas, wherein the coefficients are respectively recorded as: IP 0-IP 13, QP 0-QP 13 and giving the parameters to the PL terminal through AXI;
wherein,,
is the PRACH transmission opportunity in PRACH time slot, from 0 to +.>
Further, the parameters for determining each OFDM symbol and phase compensation calculation by the control signal related to OFDM are: the 28 parameters obtained from ARM are combined with 14 OFDM symbols in each subframe: IQ data of ofdm0 to ofdm13 are respectively calculated by complex numbers from IP0 to IP13 and QP0 to QP13 corresponding to the IQ data.
(III) beneficial effects
Compared with the prior art, the invention has the beneficial effects that:
the method for realizing the phase compensation of the 5G remote radio unit in the downlink is realized in a relatively simple and flexible manner so as to be capable of being rapidly realized in engineering.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a system configuration diagram according to an embodiment of the present application.
Fig. 2 is a flow chart of a phase compensation method according to an embodiment of the present application.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the disclosure by way of illustration, and only the components related to the disclosure are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Phase noise is essentially an error between the local oscillator phase and the carrier signal phase, which can cause distortion of the OFDM system received signal, resulting in reduced system performance. OFDM is widely used in 5G systems because of its resistance to multipath interference, high spectrum utilization, and so on. However, the OFDM system is relatively sensitive to phase noise because the subcarriers are mutually orthogonal, and the orthogonality among the subcarriers is easily damaged under the influence of the phase noise, which ultimately leads to the degradation of the system performance.
Referring to fig. 1, the system comprises a Cortex a53 processor, an AXI interface unit and a phase compensation unit, and the method suitable for 5G ora downlink phase compensation comprises the following steps:
s1: the phase compensation of the IQ data in the down-conversion frequency domain is calculated, and the calculation method is as follows:
wherein f0 is carrier frequency, μ is subcarrier spacing configuration; the UE is a receiving end and performs down-conversion;
since the real signals are real signals, the complex signals are only the down-converted signal transmitting parts for easy expression and operation, and the real signals are expressed, the real part operation Re { } is taken here.
According to the property of Fourier transformation and the frequency shift principle, the left shift plus and right shift minus principle, the CP is used for preventing ISI/ICI, the continuity of the original OFDM symbol is broken, the CP is added before each OFDM, and the CP is removed before FFT, so that the phase added in the CP time is required to be compensated.
For any physical channel or signal other than PRACH, OFDM symbols in a subframe
Time-continuous signal on antenna port +.>
And subcarrier spacing configuration μ is defined as follows:
wherein, the delta f takes the value as shown in the following table, and mu is the interval configuration of subcarriers; mu (mu) 0 For the maximum μ value in the subcarrier spacing configuration determined by the higher layer parameter scspeccarrier list
| μ | △f＝2 μ ·15[kHz] |
| 0 | 15 |
| 1 | 30 |
| 2 | 60 |
| 3 | 120 |
| 4 | 240 |
The starting position of the OFDM symbol for subcarrier spacing configuration in a subframe is given by:
s2: the parameter to be compensated for the phase corresponding to each OFDM symbol in a frame of data at the current configured frequency point is calculated by Cortex a53, specifically as follows:
calculating coefficients of 14 OFDM symbols in each subframe to be subjected to phase compensation according to frequency points and subcarrier intervals configured by a user and the following formulas, wherein the coefficients are respectively recorded as: IP 0-IP 13, QP 0-QP 13 and giving the parameters to the PL terminal through AXI;
wherein,,
is the PRACH transmission opportunity in PRACH time slot, from 0 to +.>
S3: determining parameters of each OFDM symbol and phase compensation calculation by control signals related to OFDM;
the 28 parameters obtained from ARM are combined with 14 OFDM symbols in each subframe: IQ data of ofdm0 to ofdm13 respectively correspond to IP0 to IP13 and QP0 to QP13 to perform complex operation;
s4: and S3, obtaining an operation result which is new IQ data obtained through phase compensation, and outputting corresponding data.
In this embodiment, the coefficient calculated on the ARM is set to the DU or the network management to calculate, and then transmitted to the ORU through the network, so as to implement online configuration of the compensation parameter, and implement the method of implementing phase compensation in the downlink by the 5G remote radio unit in a relatively simple and flexible manner, so as to be able to be implemented quickly in engineering.
The embodiment of the invention also provides a device suitable for 5G ORAN downlink phase compensation, which specifically comprises: the IQ data calculation module is used for calculating phase compensation of IQ data in a down-conversion frequency domain, and the calculation method comprises the following steps:
wherein f0 is carrier frequency, μ is subcarrier spacing configuration;
the compensation parameter calculation module is configured to calculate, through Cortex a53, a parameter to be compensated for a phase corresponding to each OFDM symbol in a frame of data under a current configured frequency point, where the calculation mode is as follows:
calculating coefficients of 14 OFDM symbols in each subframe to be subjected to phase compensation according to frequency points and subcarrier intervals configured by a user and the following formulas, wherein the coefficients are respectively recorded as: IP 0-IP 13, QP 0-QP 13 and giving the parameters to the PL terminal through AXI;
wherein,,
is the PRACH transmission opportunity in PRACH time slot, from 0 to +.>
Determining parameters of each OFDM symbol and phase compensation calculation by control signals related to OFDM;
the output module is used for outputting new IQ data obtained by compensation, and the calculation mode is as follows:
the 28 parameters obtained from ARM are combined with 14 OFDM symbols in each subframe: IQ data of ofdm0 to ofdm13 are respectively calculated by complex numbers from IP0 to IP13 and QP0 to QP13 corresponding to the IQ data.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. A method for 5G ora downstream phase compensation, comprising the steps of:
s1: calculating phase compensation of IQ data in a down-conversion frequency domain;
s2: calculating parameters to be compensated for corresponding phases of each OFDM symbol in one frame of data under the current configured frequency point through a processor;
s3: determining parameters of each OFDM symbol and phase compensation calculation by control signals related to OFDM;
s4: the operation result obtained in the step S3 is new IQ data obtained through phase compensation, and corresponding data are output;
the calculation method in step S1 is as follows:
wherein f0 is carrier frequency, μ is subcarrier spacing configuration;
for any physical channel or signal other than PRACH, OFDM symbols in a subframe
Time-continuous signal on antenna port +.>
And subcarrier spacing configuration μ is defined as follows:
wherein μ is a subcarrier spacing configuration; mu (mu) 0 Is the maximum μ value in the subcarrier spacing configuration determined by the higher layer parameter scsspecificCarrierList;
the calculation method in step S2 is as follows:
calculating coefficients of 14 OFDM symbols in each subframe to be subjected to phase compensation according to frequency points and subcarrier intervals configured by a user and the following formulas, wherein the coefficients are respectively recorded as: IP 0-IP 13, QP 0-QP 13 and giving the parameters to the PL terminal through AXI;
wherein the method comprises the steps of，
Is the PRACH transmission opportunity in PRACH time slot, from 0 to +.>
2. The method for 5G ora downstream phase compensation according to claim 1, wherein the Δf is as follows:
Δf＝2 μ ·15(kHz)
wherein μ=0, 1, 2, 3, 4.
3. The method for 5G ora downstream phase compensation according to claim 2, wherein the starting position of the OFDM symbol for subcarrier spacing configuration in the subframe is given by:
4. the method for 5G ora downstream phase compensation according to claim 1, wherein step S3 further comprises: the 28 parameters obtained from ARM are combined with 14 OFDM symbols in each subframe: IQ data of ofdm0 to ofdm13 are respectively calculated by complex numbers from IP0 to IP13 and QP0 to QP13 corresponding to the IQ data.
5. An apparatus for 5G ora downstream phase compensation, comprising:
the IQ data calculation module is used for calculating phase compensation of IQ data in a down-conversion frequency domain;
the compensation parameter calculation module is used for calculating parameters to be compensated for corresponding to each OFDM symbol phase in one frame of data under the current configured frequency point through the processor; determining parameters of each OFDM symbol and phase compensation calculation by control signals related to OFDM;
the output module is used for outputting new IQ data obtained by compensation;
the IQ data calculation method comprises the following steps:
wherein f0 is carrier frequency, μ is subcarrier spacing configuration;
for any physical channel or signal other than PRACH, OFDM symbols in a subframe
Time-continuous signal on antenna port +.>
And subcarrier spacing configuration μ is defined as follows:
wherein μ is a subcarrier spacing configuration; mu (mu) 0 Is the maximum μ value in the subcarrier spacing configuration determined by the higher layer parameter scsspecificCarrierList;
the parameter mode for calculating the phase to be compensated corresponding to each OFDM symbol in one frame of data under the current configured frequency point is as follows:
calculating coefficients of 14 OFDM symbols in each subframe to be subjected to phase compensation according to frequency points and subcarrier intervals configured by a user and the following formulas, wherein the coefficients are respectively recorded as: IP 0-IP 13, QP 0-QP 13 and giving the parameters to the PL terminal through AXI;
wherein,,
is the PRACH transmission opportunity in PRACH time slot, from 0 to +.>
6. The apparatus for 5G ora downstream phase compensation according to claim 5, wherein the determining each OFDM symbol and the calculated parameters of the phase compensation by means of the control signal related to OFDM is:
the 28 parameters obtained from ARM are combined with 14 OFDM symbols in each subframe: IQ data of ofdm0 to ofdm13 are respectively calculated by complex numbers from IP0 to IP13 and QP0 to QP13 corresponding to the IQ data.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401829A (en) * | 2013-06-26 | 2013-11-20 | 吉林大学 | IQ imbalance compensation method for coherent-light orthogonal frequency division multiplexing (OFDM) communication system |
| CN105847211A (en) * | 2016-03-15 | 2016-08-10 | 东南大学 | Carrier frequency offset estimation method suitable for MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system |
| CN107819710A (en) * | 2016-09-12 | 2018-03-20 | 深圳市中兴微电子技术有限公司 | I/Q mismatch compensation method and apparatus, compensation equipment and communication equipment |
| WO2018088620A1 (en) * | 2016-11-09 | 2018-05-17 | 주식회사 에치에프알 | Method for compensating for distortion of subcarrier by using single-tap equalizer in ofdm system and apparatus therefor |
| CN114095322A (en) * | 2021-09-28 | 2022-02-25 | 超讯通信股份有限公司 | Phase noise suppression method, phase noise suppression device and storage medium |
| CN114257253A (en) * | 2020-09-21 | 2022-03-29 | 珠海全志科技股份有限公司 | Method and device for compensating broadband IQ imbalance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101278025B1 (en) * | 2009-10-15 | 2013-06-21 | 한국전자통신연구원 | Receiving apparatus with OFDM I/Q imbalance compensation and method thereof |
-
2022
- 2022-04-22 CN CN202210431901.0A patent/CN114760683B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401829A (en) * | 2013-06-26 | 2013-11-20 | 吉林大学 | IQ imbalance compensation method for coherent-light orthogonal frequency division multiplexing (OFDM) communication system |
| CN105847211A (en) * | 2016-03-15 | 2016-08-10 | 东南大学 | Carrier frequency offset estimation method suitable for MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system |
| CN107819710A (en) * | 2016-09-12 | 2018-03-20 | 深圳市中兴微电子技术有限公司 | I/Q mismatch compensation method and apparatus, compensation equipment and communication equipment |
| WO2018088620A1 (en) * | 2016-11-09 | 2018-05-17 | 주식회사 에치에프알 | Method for compensating for distortion of subcarrier by using single-tap equalizer in ofdm system and apparatus therefor |
| CN114257253A (en) * | 2020-09-21 | 2022-03-29 | 珠海全志科技股份有限公司 | Method and device for compensating broadband IQ imbalance |
| CN114095322A (en) * | 2021-09-28 | 2022-02-25 | 超讯通信股份有限公司 | Phase noise suppression method, phase noise suppression device and storage medium |
Non-Patent Citations (3)
| Title |
|---|
| "GERAN#66_Report_v001".3GPP tsg_geran\TSG_GERAN.2015,全文. * |
| Nokia, Nokia Siemens Networks.R1-131239 "Impairments Impact on 256QAM DL performance in LTE".3GPP tsg_ran\WG1_RL1.2013,(TSGR1_72b),全文. * |
| 袁建国 ; 张文静 ; 李阳旭.CO-OFDM***中的相位噪声补偿算法.《重庆邮电大学学报(自然科学版)》.2021,全文. * |
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