CN102045278A - Preprocessing method for base band signal - Google Patents

Preprocessing method for base band signal Download PDF

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CN102045278A
CN102045278A CN2010106184072A CN201010618407A CN102045278A CN 102045278 A CN102045278 A CN 102045278A CN 2010106184072 A CN2010106184072 A CN 2010106184072A CN 201010618407 A CN201010618407 A CN 201010618407A CN 102045278 A CN102045278 A CN 102045278A
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signal
qmc
quadrature modulation
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fpga
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CN102045278B (en
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宋敏
王斌
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Chengdu Nts Software Co ltd
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NTS Technology Chengdu Co Ltd
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Abstract

The invention discloses a preprocessing method for a base band signal, comprising the following steps: (a) creating a computing circuit for receiving a down-conversion output signal, on an FPGA through a logical algorithm; (b) decomposing the down-conversion output signal into an in-phase component I and an orthogonal component Q; (c) processing the in-phase component I and the orthogonal component Q through the computing circuit; and eliminating amplitude phase error and DC bias of an analogue channel; (d) outputting the signal. In the method, a QMC adjusting parameter is suitable at each different work carrier frequency, under the environment of different work temperature and the like, QMC can be performed in real time; orthogonal modulation emitting local oscillation leakage and orthogonal modulation emitting mirror image leakage are both minimum; and regular work thread is not obviously influenced by QMC correction process.

Description

A kind of baseband signal preprocess method
Technical field
The present invention relates to a kind of base band signal process technology, specifically be meant a kind of baseband signal preprocess method.
Background technology
Signal transmits in base band, because channel transfer characteristic is undesirable, factors such as noise jamming, cause signal skew, cause baseband signal to have direct current biasing, and amplitude-phase has error, baseband signal is through handling, after being converted into the analog radio-frequency signal transmission, cause local-oscillator leakage, the deterioration that mirror image leaks.
Summary of the invention
The object of the present invention is to provide a kind of baseband signal preprocess method,, obtain the relevant parameter factor of distortion, bring among the QMC baseband signal is carried out preliminary treatment, reach the purpose of correcting distortion signal by the QM modulation.
Purpose of the present invention is achieved through the following technical solutions:
A kind of baseband signal preprocess method of the present invention may further comprise the steps:
(a) on FPGA, pass through logical algorithm, set up the computing circuit that receives the down-conversion output signal;
(b) the down-conversion output signal is decomposed into in-phase component I and quadrature component Q;
(c) by computing circuit in-phase component I and quadrature component Q are handled, eliminate the amplitude phase error and the direct current biasing of analog channel;
(d) output signal.
Further, the computing circuit set up of described step (a) comprises QM quadrature modulation circuit and QMC quadrature modulation correcting circuit.
Further, described step (c) may further comprise the steps:
(c1) at the idle time slot of system or the appointed interval of agreement, the training sequence during software trigger FPGA transmission is built-in, training sequence length is:
Figure 110755DEST_PATH_IMAGE001
Consider that according to the GSM standard FPGA guarantees to send training sequence at the GP time slot, with the monotony frequency fc that determines to send, 1024 sampled points of sampling, 1024 sampled points are in the cycle of integral multiple that with 2 π is the cycle;
(c2) FPGA catches the training sequence through distortion that feeds back , catch length and be
FPGA catches the training sequence S(t of the distortion that feeds back), software is sampled to it, and its sampling number is the sampling number in arbitrary cycle in 1024 sampled points;
(c3) to this distortion sequence of catching
Figure 563623DEST_PATH_IMAGE002
, carry out following processing:
Figure 953016DEST_PATH_IMAGE004
In the formula
Figure 237367DEST_PATH_IMAGE005
Be the distortion IQ modulation I signal of base band in the quadrature modulation QM model,
Figure 197364DEST_PATH_IMAGE006
Be the distortion IQ modulation Q signal of base band in the quadrature modulation QM model, the sampled point that extracts carried out the 1/4Fs mixing, extracts 2 times after, the baseband I Q signal of acquisition distortion, low-pass filtering is mainly used in and leaches image signal herein;
(c4) sampled signal is carried out Fourier transform, the direct current biasing in the picked up signal:
Figure 287680DEST_PATH_IMAGE007
In the formula
Figure 780847DEST_PATH_IMAGE008
DC deviation for I passage in the quadrature modulation QM model;
Figure 298416DEST_PATH_IMAGE009
Be the DC deviation of Q passage in the quadrature modulation QM model, j is the imaginary symbols in the plural number,
For reducing measure error, select the length of sampling
Figure 198239DEST_PATH_IMAGE010
, make
Figure 577399DEST_PATH_IMAGE011
M is any natural number in the formula, Pi=π;
(c5) from
Figure 675805DEST_PATH_IMAGE005
With
Figure 604754DEST_PATH_IMAGE006
Eliminate direct current biasing in the signal, obtain With
Figure 971461DEST_PATH_IMAGE013
,
Figure 189953DEST_PATH_IMAGE014
In the formula
Figure 987007DEST_PATH_IMAGE015
Be I, the normalization of Q channel amplitude error in the quadrature modulation QM model,
Figure 907428DEST_PATH_IMAGE016
For supposition in the quadrature modulation QM model produces additional phase error;
(c6) right
Figure 877658DEST_PATH_IMAGE017
Carry out Fourier transform:
Figure 701389DEST_PATH_IMAGE018
Try to achieve direct current biasing according to following formula;
(c7) right
Figure 669345DEST_PATH_IMAGE013
Signal carries out energy integral
Figure 827793DEST_PATH_IMAGE019
(c8) difference following relationship
Figure 853912DEST_PATH_IMAGE020
Figure 46996DEST_PATH_IMAGE021
Try to achieve respectively
Figure 185853DEST_PATH_IMAGE022
,
Figure 316751DEST_PATH_IMAGE023
(c9) according to obtaining
Figure 894363DEST_PATH_IMAGE015
,
Figure 191221DEST_PATH_IMAGE016
, ,
Figure 368441DEST_PATH_IMAGE009
,
Figure 234897DEST_PATH_IMAGE024
Figure 136994DEST_PATH_IMAGE025
Figure 932168DEST_PATH_IMAGE026
According to above relational expression, try to achieve the calibration model parameter respectively, in the formula
Figure 19390DEST_PATH_IMAGE028
DC deviation for I passage among the quadrature modulation calibration model QMC; Be the DC deviation of Q passage among the quadrature modulation calibration model QMC, Be I, the normalization of Q channel amplitude error among the quadrature modulation calibration model QMC,
Figure 784456DEST_PATH_IMAGE031
For supposition among the quadrature modulation calibration model QMC produces additional phase error.
Further, described step (d) is following calculation procedure:
Figure 992714DEST_PATH_IMAGE032
Figure 869403DEST_PATH_IMAGE033
Figure 691866DEST_PATH_IMAGE034
In the formula
Figure 273413DEST_PATH_IMAGE035
With
Figure 534630DEST_PATH_IMAGE036
Be baseband I signal and Q signal through exporting after the preliminary treatment, in the QMC model of FPGA, configuration multiplier and adder on FPGA are finished QMC and are proofreaied and correct, the output baseband signal with the calibration model parameter configuration of trying to achieve
Figure 16558DEST_PATH_IMAGE035
With
Figure 9922DEST_PATH_IMAGE036
The present invention compared with prior art has following advantage and beneficial effect:
A kind of baseband signal preprocess method of 1 the present invention, in each different working carrier frequency, QMC adjusts parameter and all is suitable for, and under different environment such as working temperature, QMC all can carry out in real time;
A kind of baseband signal preprocess method of 2 the present invention, quadrature modulation emission local-oscillator leakage and quadrature modulation transmitting mirror picture leak and minimize;
A kind of baseband signal preprocess method of 3 the present invention, the not obvious operate as normal process that influences of QMC trimming process.
Embodiment
The present invention is described in further detail below in conjunction with embodiment, but embodiments of the present invention are not limited thereto.
Embodiment
A kind of baseband signal preprocess method of the present invention may further comprise the steps:
(a) on FPGA, pass through logical algorithm, set up the QM quadrature modulation circuit and the QMC quadrature modulation correcting circuit that receive the down-conversion output signal.The FPGA type selecting can be considered according to logic scale and device cost, recommends Statix II GX and the Statix III GX series of ALTERA, perhaps the Virtex-4 SX of XILINX and Virtex-5 SX series;
(b) the down-conversion output signal is decomposed into in-phase component I and quadrature component Q;
(c1) at the idle time slot of system or the appointed interval of agreement, the training sequence during software trigger FPGA transmission is built-in, training sequence length is:
Consider that according to the GSM standard FPGA guarantees to send training sequence at the GP time slot, with the monotony frequency fc that determines to send, 1024 sampled points of sampling, 1024 sampled points are in the cycle of integral multiple that with 2 π is the cycle;
(c2) FPGA catches the training sequence through distortion that feeds back
Figure 140744DEST_PATH_IMAGE002
, catch length and be
Figure 726446DEST_PATH_IMAGE003
FPGA catches the training sequence S(t of the distortion that feeds back), software is sampled to it, and its sampling number is the sampling number in arbitrary cycle in 1024 sampled points;
(c3) to this distortion sequence of catching
Figure 890711DEST_PATH_IMAGE002
, carry out following processing:
Figure 945386DEST_PATH_IMAGE004
In the formula
Figure 548406DEST_PATH_IMAGE005
Be the distortion IQ modulation I signal of base band in the quadrature modulation QM model,
Figure 252530DEST_PATH_IMAGE006
Be the distortion IQ modulation Q signal of base band in the quadrature modulation QM model, the sampled point that extracts carried out the 1/4Fs mixing, extracts 2 times after, the baseband I Q signal of acquisition distortion, low-pass filtering is mainly used in and leaches image signal herein;
(c4) sampled signal is carried out Fourier transform, the direct current biasing in the picked up signal:
In the formula
Figure 378935DEST_PATH_IMAGE008
DC deviation for I passage in the quadrature modulation QM model; Be the DC deviation of Q passage in the quadrature modulation QM model, j is the imaginary symbols in the plural number, for reducing measure error, select the length of sampling
Figure 831093DEST_PATH_IMAGE010
, make
Figure 602740DEST_PATH_IMAGE011
M is any natural number in the formula, Pi=π;
(c5) from
Figure 864963DEST_PATH_IMAGE005
With
Figure 809785DEST_PATH_IMAGE006
Eliminate direct current biasing in the signal, obtain
Figure 975319DEST_PATH_IMAGE012
With
Figure 917867DEST_PATH_IMAGE013
,
In the formula
Figure 418829DEST_PATH_IMAGE015
Be I, the normalization of Q channel amplitude error in the quadrature modulation QM model,
Figure 688136DEST_PATH_IMAGE016
For supposition in the quadrature modulation QM model produces additional phase error;
(c6) right
Figure 801586DEST_PATH_IMAGE017
Carry out Fourier transform:
Figure 539866DEST_PATH_IMAGE018
Try to achieve direct current biasing according to following formula;
(c7) right
Figure 826490DEST_PATH_IMAGE013
Signal carries out energy integral
Figure 465151DEST_PATH_IMAGE019
(c8) difference following relationship
Figure 483923DEST_PATH_IMAGE020
Figure 958766DEST_PATH_IMAGE021
Try to achieve respectively
Figure 799814DEST_PATH_IMAGE022
,
Figure 43714DEST_PATH_IMAGE023
(c9) according to obtaining
Figure 813480DEST_PATH_IMAGE015
, ,
Figure 76151DEST_PATH_IMAGE008
,
Figure 190869DEST_PATH_IMAGE009
,
Figure 879339DEST_PATH_IMAGE024
Figure 312464DEST_PATH_IMAGE025
Figure 682265DEST_PATH_IMAGE026
In the formula
Figure 510861DEST_PATH_IMAGE028
DC deviation for I passage among the quadrature modulation calibration model QMC; DC deviation for Q passage among the quadrature modulation calibration model QMC.
Figure 89927DEST_PATH_IMAGE030
Be I, the normalization of Q channel amplitude error among the quadrature modulation calibration model QMC,
Figure 415122DEST_PATH_IMAGE031
For supposition among the quadrature modulation calibration model QMC produces additional phase error.,, try to achieve the calibration model parameter respectively according to above relational expression;
(d) according to following calculation procedure:
Figure 445395DEST_PATH_IMAGE037
Figure 354576DEST_PATH_IMAGE033
Figure 66180DEST_PATH_IMAGE038
In the formula
Figure 993685DEST_PATH_IMAGE035
With
Figure 444127DEST_PATH_IMAGE036
Be baseband I signal and Q signal through exporting after the preliminary treatment;
In the QMC model of FPGA, configuration multiplier and adder on FPGA are finished QMC and are proofreaied and correct, the output baseband signal with the calibration model parameter configuration of trying to achieve
Figure 89872DEST_PATH_IMAGE035
With
Figure 605167DEST_PATH_IMAGE036
Operation principle of the present invention is as follows:
The DC deviation of supposing the I passage is
Figure 137911DEST_PATH_IMAGE008
The DC deviation of Q passage is
Figure 509986DEST_PATH_IMAGE009
, simultaneously I, Q channel amplitude error are normalized to
Figure 883506DEST_PATH_IMAGE015
, produce additional phase error thus and be assumed to
Figure 936912DEST_PATH_IMAGE016
, then after considering the mismatch affects factor, the real output signal of the passage of QM modulation can be expressed as:
Wherein:
Figure 132718DEST_PATH_IMAGE040
Its matrix form is:
Figure 753056DEST_PATH_IMAGE041
In the formula
Figure 344574DEST_PATH_IMAGE042
Baseband signal for final actual output.
The target of QMC calibration promptly is to obtain by estimation
Figure 350445DEST_PATH_IMAGE015
,
Figure 329902DEST_PATH_IMAGE016
,
Figure 922689DEST_PATH_IMAGE008
,
Figure 317898DEST_PATH_IMAGE009
To base-band input signal
Figure 194587DEST_PATH_IMAGE043
With
Figure 331564DEST_PATH_IMAGE044
Carry out preliminary treatment, to eliminate the amplitude phase error and the direct current biasing of analog channel.The QMC calibrating patterns as shown in the formula:
Figure 598597DEST_PATH_IMAGE045
Therefore, then bring QMC precorrection model into the QM modulation pattern, can see:
Figure 341742DEST_PATH_IMAGE047
Can see and working as
Figure 397423DEST_PATH_IMAGE048
,
Figure 151752DEST_PATH_IMAGE049
,
Figure 200349DEST_PATH_IMAGE050
Figure 786051DEST_PATH_IMAGE051
The time,
Figure 28944DEST_PATH_IMAGE052
The promptly final actual baseband signal of exporting.
As mentioned above, just can realize the present invention well.

Claims (4)

1. baseband signal preprocess method is characterized in that: may further comprise the steps:
(a) on FPGA, pass through logical algorithm, set up the computing circuit that receives the down-conversion output signal;
(b) the down-conversion output signal is decomposed into in-phase component I and quadrature component Q;
(c) by computing circuit in-phase component I and quadrature component Q are handled, eliminate the amplitude phase error and the direct current biasing of analog channel;
(d) output signal.
2. according to the described a kind of baseband signal preprocess method of claim 1, it is characterized in that: the computing circuit that described step (a) is set up comprises QM quadrature modulation circuit and QMC quadrature modulation correcting circuit.
3. according to the described a kind of baseband signal preprocess method of claim 1, it is characterized in that: described step (c) may further comprise the steps:
(c1) at the idle time slot of system or the appointed interval of agreement, the training sequence during software trigger FPGA transmission is built-in, training sequence length is:
Figure 837127DEST_PATH_IMAGE001
Consider that according to the GSM standard FPGA guarantees to send training sequence at the GP time slot, with the monotony frequency fc that determines to send, 1024 sampled points of sampling, 1024 sampled points are in the cycle of integral multiple that with 2 π is the cycle;
(c2) FPGA catches the training sequence through distortion that feeds back
Figure 72936DEST_PATH_IMAGE002
, catch length and be
Figure 896667DEST_PATH_IMAGE003
FPGA catches the training sequence S(t of the distortion that feeds back), software is sampled to it, and its sampling number is the sampling number in arbitrary cycle in 1024 sampled points;
(c3) to this distortion sequence of catching
Figure 926940DEST_PATH_IMAGE002
, carry out following processing:
Figure 337586DEST_PATH_IMAGE004
In the formula
Figure 783611DEST_PATH_IMAGE005
Be the distortion IQ modulation I signal of base band in the quadrature modulation QM model,
Figure 976695DEST_PATH_IMAGE006
Be the distortion IQ modulation Q signal of base band in the quadrature modulation QM model, the sampled point that extracts carried out the 1/4Fs mixing, extracts 2 times after, the baseband I Q signal of acquisition distortion, low-pass filtering is mainly used in and leaches image signal herein;
(c4) sampled signal is carried out Fourier transform, the direct current biasing in the picked up signal:
In the formula
Figure 574346DEST_PATH_IMAGE008
DC deviation for I passage in the quadrature modulation QM model;
Figure 824062DEST_PATH_IMAGE009
Be the DC deviation of Q passage in the quadrature modulation QM model, j is the imaginary symbols in the plural number,
For reducing measure error, select the length of sampling , make
Figure 492995DEST_PATH_IMAGE011
M is any natural number in the formula, Pi=π;
(c5) from
Figure 376769DEST_PATH_IMAGE005
With
Figure 492492DEST_PATH_IMAGE006
Eliminate direct current biasing in the signal, obtain
Figure 332272DEST_PATH_IMAGE012
With
Figure 189763DEST_PATH_IMAGE013
,
In the formula Be I, the normalization of Q channel amplitude error in the quadrature modulation QM model, For supposition in the quadrature modulation QM model produces additional phase error;
(c6) right
Figure 872100DEST_PATH_IMAGE017
Carry out Fourier transform:
Figure 979734DEST_PATH_IMAGE018
Try to achieve direct current biasing according to following formula;
(c7) right
Figure 187992DEST_PATH_IMAGE013
Signal carries out energy integral
Figure 736785DEST_PATH_IMAGE019
；
(c8) difference following relationship
Figure 887144DEST_PATH_IMAGE020
Figure 468691DEST_PATH_IMAGE021
Try to achieve respectively
Figure 464329DEST_PATH_IMAGE022
,
Figure 133208DEST_PATH_IMAGE023
(c9) according to obtaining ,
Figure 756267DEST_PATH_IMAGE016
, ,
Figure 593828DEST_PATH_IMAGE009
,
Figure 820410DEST_PATH_IMAGE024
Figure 875085DEST_PATH_IMAGE025
Figure 478105DEST_PATH_IMAGE026
Figure 855996DEST_PATH_IMAGE027
According to above relational expression, try to achieve the calibration model parameter respectively, in the formula DC deviation for I passage among the quadrature modulation calibration model QMC; Be the DC deviation of Q passage among the quadrature modulation calibration model QMC,
Figure 466077DEST_PATH_IMAGE030
Be I, the normalization of Q channel amplitude error among the quadrature modulation calibration model QMC,
Figure 26371DEST_PATH_IMAGE031
For supposition among the quadrature modulation calibration model QMC produces additional phase error.
4. according to the described a kind of baseband signal preprocess method of claim 1, it is characterized in that: described step (d) is following calculation procedure:
Figure 532439DEST_PATH_IMAGE032
Figure 60241DEST_PATH_IMAGE033
Figure 5064DEST_PATH_IMAGE034
In the formula
Figure 170597DEST_PATH_IMAGE035
With Be baseband I signal and Q signal through exporting after the preliminary treatment, in the QMC model of FPGA, configuration multiplier and adder on FPGA are finished QMC and are proofreaied and correct, the output baseband signal with the calibration model parameter configuration of trying to achieve
Figure 347817DEST_PATH_IMAGE035
With
Figure 348528DEST_PATH_IMAGE036
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102437983A (en) * 2011-10-27 2012-05-02 安徽省菲特科技股份有限公司 Method and device for self-correcting emitting end I/Q modulation imbalance
CN102549994A (en) * 2011-11-15 2012-07-04 华为技术有限公司 Method and device for correcting in-phase orthogonal signal
CN105242242A (en) * 2015-08-27 2016-01-13 西安空间无线电技术研究所 Super broadband signal pre-distortion compensation method based on parameter fitting
CN103701755B (en) * 2014-01-09 2017-02-08 上海创远仪器技术股份有限公司 Method for estimating IQ imbalance in communication system
CN107589325A (en) * 2017-09-12 2018-01-16 中国电子科技集团公司第四十研究所 The generation device and production method of a kind of multi-carrier signal for Multipactor detection
CN105471789B (en) * 2014-09-05 2018-10-26 上海华虹集成电路有限责任公司 Demodulator circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
邢明等: "WCDMA中LMS自适应天线阵的硬件实现", 《微计算机信息》 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102437983A (en) * 2011-10-27 2012-05-02 安徽省菲特科技股份有限公司 Method and device for self-correcting emitting end I/Q modulation imbalance
CN102437983B (en) * 2011-10-27 2015-05-06 安徽省菲特科技股份有限公司 Method and device for self-correcting emitting end I/Q modulation imbalance
CN102549994A (en) * 2011-11-15 2012-07-04 华为技术有限公司 Method and device for correcting in-phase orthogonal signal
CN102549994B (en) * 2011-11-15 2014-03-05 华为技术有限公司 Method and device for correcting in-phase orthogonal signal
US9210025B2 (en) 2011-11-15 2015-12-08 Huawei Technologies Co., Ltd. Method and apparatus for correcting in-phase signal and quadrature-phase signal
CN103701755B (en) * 2014-01-09 2017-02-08 上海创远仪器技术股份有限公司 Method for estimating IQ imbalance in communication system
CN105471789B (en) * 2014-09-05 2018-10-26 上海华虹集成电路有限责任公司 Demodulator circuit
CN105242242A (en) * 2015-08-27 2016-01-13 西安空间无线电技术研究所 Super broadband signal pre-distortion compensation method based on parameter fitting
CN107589325A (en) * 2017-09-12 2018-01-16 中国电子科技集团公司第四十研究所 The generation device and production method of a kind of multi-carrier signal for Multipactor detection

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