CN101997789A - Vector signal generating method and generator - Google Patents

Vector signal generating method and generator Download PDF

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CN101997789A
CN101997789A CN2009100567209A CN200910056720A CN101997789A CN 101997789 A CN101997789 A CN 101997789A CN 2009100567209 A CN2009100567209 A CN 2009100567209A CN 200910056720 A CN200910056720 A CN 200910056720A CN 101997789 A CN101997789 A CN 101997789A
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signal
baseband
channel data
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generator
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沙洁
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Sanda University
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Sanda University
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Abstract

The invention discloses a vector signal generating method and a generator. The generating method is realized by carrying out virtual design through an LabVIEW language and comprises the following steps of: firstly, establishing a base band digital signal generator, generating the base band signals of channel I data and channel Q data and outputting the base band signals; secondly, establishing a pulse shaping filter and an I/Q modulator to carry out filtering and modulation on the base band signals; and finally, establishing a D/A (Digital to Analog) converter to convert a digital modulation signal into an analog signal and outputting the analog signal. According to the invention, the generator can generate vector signals based on different modulation methods, change signal spectrums, simulate channel noise, transmit the analog signal and the like according to the user requirements.

Description

A kind of method for generation of vector signal and generator
Technical field
The present invention relates to the digital communication fields of measurement, particularly a kind of method for generation of vector signal and generator.
Background technology
A communication system referring to Fig. 1, generally includes three key elements: reflector, channel and receiver.
The function of reflector is the signal injected carrier that information source is produced, and by changing amplitude, frequency or the phase place of carrier wave, is modulated into the signal that is adapted at transmitting in the channel then.Modulated process can arrive any position to the frequency spectrum shift of source signal, thereby helps the transmission of signal, and can make frequency spectrum resource be fully used by multiplexed method.Channel is the media of signal transmission, and signal has decay in various degree in the process of transmission, and its main source is the additive property noise.Therefore, receiver need extract original signal message with corresponding demodulating algorithm from carrier wave.The accuracy of actual demodulation depends on factors such as the selection, signal to noise ratio of demodulating algorithm.
For signal generator, particularly the vector signal generator can carry out design of Virtual Instrument by the LabVIEW language, thereby realizes the function of described vector signal generator.
LabVIEW is the graphic programming environment of a kind of innovation of American National instrument company exploitation, compares the text based programming language, has proposed the design method based on piece (Block).Each LabVIEW program can be designed to a virtual instrument (VI), and simultaneously, a VI can also have a plurality of sub-VI.
The core concept of LabVIEW is structurized data flow, and each VI operation all must be followed the standard of data flow, and promptly node has only when all inputs and all possesses the Shi Caike operation, the result after operation is finished as input and output to next node.
Summary of the invention
The purpose of this invention is to provide a kind of method for generation and generator of vector signal, it can produce vector signal and use for dependence test.
On the one hand, the invention provides a kind of method for generation of vector signal, it is realized by the LabVIEW language, may further comprise the steps:
1.1, set up the baseband digital signal generator, make it generate random binary sequence, binary sequence is mapped as baseband signalling, the baseband signalling that forms is carried out energy control, at last baseband signalling is separated into I channel data and Q channel data and output in the IQ modulation;
1.2, set up pulse shaping filter, make the I passage of its conditioning step 1.1 outputs and Q passage baseband signalling signal bandwidth and export filtered signal by the RC filter of Qwest's condition in satisfying;
1.3, set up the I/Q modulator, it is modulated filtered I channel data and Q channel data by the carrier wave that is complementary, and the signal of signal after will modulating and I/Q passage through product modulated and output;
1.4, set up D/A converter, make its digital modulation signals change analog signal and output into step 1.3 output.
The job step of baseband digital signal generator comprises in the described step 1.1:
1.1.1, generate binary sequence;
1.1.2, by planisphere binary sequence is mapped as baseband signalling;
1.1.3, the amplitude of baseband signalling be multiply by energy control constant;
1.1.4, will be separated into I channel data and Q channel data and output in the IQ modulation through the baseband signalling of energy control.
The job step of the pulse shaping filter in the described step 1.2 comprises:
1.2.1, obtain baseband symbol stream, set up a root raised cosine filter and a shift register simultaneously;
1.2.2, by described living cosine filter baseband signalling is formed filtering at transmitting terminal;
1.2.3, by described shift register baseband signalling is carried out matched filtering at receiving terminal.
The job step of the I/Q modulator in the described step 1.3 comprises:
1.3.1, with filtered I channel data by cos (2 π f cT) carrier wave is modulated;
1.3.2, with filtered Q channel data by sin (2 π f cT) carrier wave is modulated;
1.3.3, with the signal of the data after the modulation of above-mentioned two steps and I/Q passage through product modulated and export.
The step that provides user interface that relevant parameter is set for the user also is provided described method.
On the other hand, the present invention also provides a kind of vector signal generator, and it is realized by the LabVIEW language, comprising:
The baseband digital signal generator in order to generate random binary sequence, is mapped as baseband signalling with binary sequence, and the baseband signalling that forms is carried out energy control, at last baseband signalling is separated into I channel data and the output of Q channel data in the IQ modulation;
Pulse shaping filter connects the output of described baseband digital signal generator, exports filtered signal in order to the signal bandwidth of the baseband signalling that limits described I passage and Q passage and by the RC filter of Qwest's condition in satisfying;
The I/Q modulator connects the output of described pulse shaping filter, and in order to filtered I channel data and Q channel data are modulated by the carrier wave that is complementary, and the signal of signal after will modulating and I/Q passage is through product modulated and output;
D/A converter connects the output of described I/Q modulator, changes analog signal and output in order to the digital modulation signals with the output of I/Q modulator.
Described baseband digital signal generator also comprises:
Generate the module of binary sequence;
Binary sequence is mapped as the module of baseband signalling by planisphere;
The amplitude of baseband signalling be multiply by the module of energy control constant;
To be separated into the I channel data in the IQ modulation and the module of Q channel data and output through the baseband signalling of energy control.
Described pulse shaping filter also comprises:
Obtain baseband symbol stream and set up a root raised cosine filter and the module of a shift register;
By described living cosine filter baseband signalling is formed the module of filtering at transmitting terminal;
By described shift register baseband signalling is carried out the module of matched filtering at receiving terminal.
Described I/Q modulator also comprises:
Filtered I channel data is passed through cos (2 π f cT) the carrier wave module of modulating;
Filtered Q channel data is passed through sin (2 π f cT) the carrier wave module of modulating;
With the signal of the data after the modulation of above-mentioned two modules and I/Q passage through product modulated and the module exported.
Described generator also comprises subscriber interface module, uses for the user modulator approach, every slot symbol number, sample frequency, carrier frequency are set.
Adopt the method for generation and the generator of a kind of vector signal of the present invention, it carries out virtual design by the LabVIEW language realizes, at first sets up the baseband digital signal generator, produces the baseband signal and the output of I channel data and Q channel data; Next sets up pulse shaping filter and I/Q modulator, and baseband signal is carried out filtering and modulation; Set up D/A converter at last, change digital modulation signals into analog signal and output.The present invention can produce vector signal based on different modulation, change signal spectrum, analog channel noise, transmission of analogue signal etc. according to user's needs.
Description of drawings
Fig. 1 is the formation element schematic diagram of present communication system;
Fig. 2 is the flow chart of described method;
Fig. 3 is the theory diagram of described generator;
Fig. 4 is the workflow diagram of described baseband digital signal generator;
Fig. 5 is the workflow diagram of described pulse shaping filter;
Fig. 6 is the workflow diagram of described I/Q modulator.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
With reference to Fig. 2, the invention provides a kind of method for generation 100 of vector signal, it is realized by the LabVIEW language, comprises step 101,102,103,104, can set up vector signal generator 200 among Fig. 3 by described method 100, below these steps are introduced:
101, set up the baseband digital signal generator, in order to produce baseband signalling and to be separated into the I channel data and the output of Q channel data.
Set up the baseband digital signal generator, make it generate random binary sequence, binary sequence is mapped as baseband signalling, the baseband signalling that forms is carried out energy control, at last baseband signalling is separated into I channel data and Q channel data and output in the IQ modulation.
Modern Communication System needs bigger information throughput, higher signal quality, better safety and digital signal compatibility.The advantage of digital signal is that the designer can do any processing to digitized signal: can send signal at any time; Can mix transmission with other information; Can use various digital modulation mechanism to reduce transmitted data amount, raise the efficiency.In numerous digital modulation algorithms, the IQ quadrature modulation is a kind of a kind of modulation scheme that improves effective transmission speed and antinoise signal interference under the situation that does not increase bandwidth.
Digital signal generator generates at random binary data, mapping binary bits to be symbol and symbol is separated into in-phase and quadrature component in the IQ modulation.And different, method is exactly the planisphere (constellation diagram) by signal to the method for mapping the most intuitively according to different modulator approaches.Planisphere has shown all possible value of symbol of different modulation on the complex plane of two dimension.In order to minimize the burst error in the transmission course, all here sign map all adopt Gray code (Gray Code).Symbol after the baseband modulation can be expressed as on complex plane
Figure B2009100567209D0000051
A nAnd θ nValue as the table 2-1 shown in:
Table 2-1 modulation symbol table
Modulator approach S l S Q
BPSK A ncosθ n，θ n＝0，π；A n＝1 None
Figure B2009100567209D0000052
In actual implementation procedure, consider the energy control of modulation back symbol, the amplitude of output symbol need multiply by a control constant D.This constant can be by deriving in the planisphere of different modulating algorithm.For PSK, the average symbol ENERGY E sObtain after deriving with the relation of Δ:
E s=| Δ e -f θ| 2=Δ (D is the sign magnitude of complex plane, and q is the phase place of symbol)
For QAM situation more complexity a bit, the average symbol ENERGY E sGet after deriving with the relation of Δ:
(M is a QAM progression, D be adjacent two pitch characters from half (level and vertical direction), E kBe the energy of k symbol)
Referring to Fig. 4, the job step of baseband digital signal generator comprises in the described step 101:
Generate binary sequence;
By planisphere binary sequence is mapped as baseband signalling;
The amplitude of baseband signalling be multiply by energy control constant;
To be separated into I channel data and Q channel data and output in the IQ modulation through the baseband signalling of energy control.
102, set up pulse shaping filter, make its restriction baseband signalling signal bandwidth and carry out filtering by filter.
Set up pulse shaping filter, make the I passage of its conditioning step 101 outputs and Q passage baseband signalling signal bandwidth and export filtered signal by the RC filter of Qwest's condition in satisfying.
Pulse shaping filter acts on the bandwidth that the baseband modulation symbol comes restricting signal.In addition, it has avoided intersymbol interference (ISI) by satisfying Nyquist criterion.The pulse shaping filter that satisfies Nyquist criterion is called nyquist filter again.
The RC filter all has zero cross point at each symbol period of time domain, Qwest's condition in satisfying; At frequency domain, low-frequency range is a unit gain, the Mid Frequency raised cosine spectrum, and the high band zero gain is the bandwidth of control signal effectively.In order to make in sampling time signal to noise ratio maximum, usually use two root raised cosines (RRC) filter in actual applications: one as the transmitting terminal forming filter, one in receiving terminal formation matched filtering, both total effects are equivalent to single RC filter, do to make that signal to noise ratio reaches the highest when sampling like this, can in certain band limit flat channel, not introduce intersymbol interference again.
The impulse response of RRC filter is defined as follows:
P rrc ( t ) = 4 α cos [ ( 1 + α ) πt / T s ] + sin [ ( 1 - α ) / T s ] ( 4 αt / T s ) - 1 π T s [ 1 - 16 α 2 t 2 / T s 2 ]
By means of the shift register of LabVIEW, transmitting terminal is P Rrc(t) act on the baseband signal of modulating at each symbol period, be equivalent in the frequency domain effect root raised cosine filter.
Referring to Fig. 5, the job step of the pulse shaping filter in the described step 102 comprises:
Obtain baseband symbol stream, set up a root raised cosine filter and a shift register simultaneously;
By described living cosine filter baseband signalling is formed filtering at transmitting terminal;
By described shift register baseband signalling is carried out matched filtering at receiving terminal.
103, set up the I/Q modulator, make it with filtering after baseband signal modulate and export.
Set up the I/Q modulator, it is modulated filtered I channel data and Q channel data by the carrier wave that is complementary, and the signal of signal after will modulating and I/Q passage is through product modulated and output.
The I/Q modulation has two purposes: the one, and in-phase that integration separates and quadrature data flow are so that improve the availability of frequency spectrum; The 2nd, the frequency that promotes baseband signal is to the scope that is fit to long-distance transmissions.The baseband signal of two passages is by the carrier modulation of two quadratures, i.e. cos (2 π f cT) and sin (2 π f cT), with the signal of I/Q passage after product modulated and be last output signal.
Referring to Fig. 6, the job step of the I/Q modulator in the described step 103 comprises:
Filtered I channel data is passed through cos (2 π f cT) carrier wave is modulated;
Filtered Q channel data is passed through sin (2 π f cT) carrier wave is modulated;
The data after the above-mentioned two steps modulation and the signal of I/Q passage are also exported through product modulated.
104, set up D/A converter, make its digital modulation signals change analog signal and output into step 103 output.
The D/A converter design is in order to realize the D/A conversion, to become the I/Q modulation signal transitions of software generation physical signalling to spread out of by analog channel.The transmission of physical signalling needs precise timing sequence control and transmitting-receiving synchronously.Here used 2 function generators: one as external clock reference, and another is as the start trigger of two data acquisition cards.The parameter of DAQ plate is shown in following table 2.2:
Table 2.2
As an embodiment, the method for the invention 100 also comprises provides user interface to supply the user that the step of relevant parameter is set, and the user is by layout setting modulator approach, every slot symbol number, sample frequency, carrier frequency etc.
Referring to Fig. 3, the present invention also provides a kind of vector signal generator 200, and it is realized by the LabVIEW language, comprising:
Baseband digital signal generator 201 in order to generate random binary sequence, is mapped as baseband signalling with binary sequence, and the baseband signalling that forms is carried out energy control, at last baseband signalling is separated into I channel data and the output of Q channel data in the IQ modulation;
Pulse shaping filter 202 connects the output of described baseband digital signal generator 201, exports filtered signal in order to the signal bandwidth of the baseband signalling that limits described I passage and Q passage and by the RC filter of Qwest's condition in satisfying;
I/Q modulator 203 connects the output of described pulse shaping filter 202, and in order to filtered I channel data and Q channel data are modulated by the carrier wave that is complementary, and the signal of signal after will modulating and I/Q passage is through product modulated and output;
D/A converter 204 connects the output of described I/Q modulator 203, changes analog signal and output in order to the digital modulation signals with 203 outputs of I/Q modulator.
As an embodiment, described baseband digital signal generator 201 also comprises:
Generate the module of binary sequence;
Binary sequence is mapped as the module of baseband signalling by planisphere;
The amplitude of baseband signalling be multiply by the module of energy control constant;
To be separated into the I channel data in the IQ modulation and the module of Q channel data and output through the baseband signalling of energy control.
As an embodiment, described pulse shaping filter 202 also comprises:
Obtain baseband symbol stream and set up a root raised cosine filter and the module of a shift register;
By described living cosine filter baseband signalling is formed the module of filtering at transmitting terminal;
By described shift register baseband signalling is carried out the module of matched filtering at receiving terminal.
As an embodiment, described I/Q modulator 203 also comprises:
Filtered I channel data is passed through cos (2 π f cT) the carrier wave module of modulating;
Filtered Q channel data is passed through sin (2 π f cT) the carrier wave module of modulating;
With the signal of the data after the modulation of above-mentioned two modules and I/Q passage through product modulated and the module exported.
In addition, described generator also comprises subscriber interface module, uses for the user modulator approach, every slot symbol number, sample frequency, carrier frequency are set.
It is pointed out that the method for generation 100 of a kind of vector signal generator 200 of the present invention and a kind of vector signal of the present invention, both are identical or similar on principle and embodiment, so its repeating part repeats no more.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of above embodiment.

Claims (10)

1. the method for generation of a vector signal, it is realized by the LabVIEW language, it is characterized in that, may further comprise the steps:
1.1, set up the baseband digital signal generator, make it generate random binary sequence, binary sequence is mapped as baseband signalling, the baseband signalling that forms is carried out energy control, at last baseband signalling is separated into I channel data and Q channel data and output in the IQ modulation;
1.2, set up pulse shaping filter, make the I passage of its conditioning step 1.1 outputs and Q passage baseband signalling signal bandwidth and export filtered signal by the RC filter of Qwest's condition in satisfying;
1.3, set up the I/Q modulator, it is modulated filtered I channel data and Q channel data by the carrier wave that is complementary, and the signal of signal after will modulating and I/Q passage through product modulated and output;
1.4, set up D/A converter, make its digital modulation signals change analog signal and output into step 1.3 output.
2. the method for claim 1 is characterized in that, the job step of baseband digital signal generator comprises in the described step 1.1:
1.1.1, generate binary sequence;
1.1.2, by planisphere binary sequence is mapped as baseband signalling;
1.1.3, the amplitude of baseband signalling be multiply by energy control constant;
1.1.4, will be separated into I channel data and Q channel data and output in the IQ modulation through the baseband signalling of energy control.
3. method as claimed in claim 2 is characterized in that, the job step of the pulse shaping filter in the described step 1.2 comprises:
1.2.1, obtain baseband symbol stream, set up a root raised cosine filter and a shift register simultaneously;
1.2.2, by described living cosine filter baseband signalling is formed filtering at transmitting terminal;
1.2.3, by described shift register baseband signalling is carried out matched filtering at receiving terminal.
4. method as claimed in claim 3 is characterized in that, the job step of the I/Q modulator in the described step 1.3 comprises:
1.3.1, with filtered I channel data by cos (2 π f cT) carrier wave is modulated;
1.3.2, with filtered Q channel data by sin (2 π f cT) carrier wave is modulated;
1.3.3, with the signal of the data after the modulation of above-mentioned two steps and I/Q passage through product modulated and export.
5. method as claimed in claim 4 is characterized in that, the step that provides user interface that relevant parameter is set for the user also is provided described method.
6. vector signal generator, it is realized by the LabVIEW language, it is characterized in that, comprising:
The baseband digital signal generator in order to generate random binary sequence, is mapped as baseband signalling with binary sequence, and the baseband signalling that forms is carried out energy control, at last baseband signalling is separated into I channel data and the output of Q channel data in the IQ modulation;
Pulse shaping filter connects the output of described baseband digital signal generator, exports filtered signal in order to the signal bandwidth of the baseband signalling that limits described I passage and Q passage and by the RC filter of Qwest's condition in satisfying;
The I/Q modulator connects the output of described pulse shaping filter, and in order to filtered I channel data and Q channel data are modulated by the carrier wave that is complementary, and the signal of signal after will modulating and I/Q passage is through product modulated and output;
D/A converter connects the output of described I/Q modulator, changes analog signal and output in order to the digital modulation signals with the output of I/Q modulator.
7. generator as claimed in claim 6 is characterized in that, described baseband digital signal generator also comprises:
Generate the module of binary sequence;
Binary sequence is mapped as the module of baseband signalling by planisphere;
The amplitude of baseband signalling be multiply by the module of energy control constant;
To be separated into the I channel data in the IQ modulation and the module of Q channel data and output through the baseband signalling of energy control.
8. generator as claimed in claim 7 is characterized in that, described pulse shaping filter also comprises:
Obtain baseband symbol stream and set up a root raised cosine filter and the module of a shift register;
By described living cosine filter baseband signalling is formed the module of filtering at transmitting terminal;
By described shift register baseband signalling is carried out the module of matched filtering at receiving terminal.
9. generator as claimed in claim 8 is characterized in that, described I/Q modulator also comprises:
Filtered I channel data is passed through cos (2 π f cT) the carrier wave module of modulating;
Filtered Q channel data is passed through sin (2 π f cT) the carrier wave module of modulating;
With the signal of the data after the modulation of above-mentioned two modules and I/Q passage through product modulated and the module exported.
10. generator as claimed in claim 9 is characterized in that described generator also comprises subscriber interface module, uses for the user modulator approach, every slot symbol number, sample frequency, carrier frequency are set.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102882658A (en) * 2011-07-12 2013-01-16 联发科技股份有限公司 Signal transmitting methods and transmitters using the same
CN104158781A (en) * 2014-08-28 2014-11-19 上海航天电子通讯设备研究所 FPGA (Field Programmable Gate Array)-based ultrahigh-speed APSK (Amplitude Phase Shift Keying) modulation method and modulation system
CN111769876A (en) * 2020-06-16 2020-10-13 光创新电(苏州)信息科技有限公司 Vector millimeter wave signal generation system based on optical carrier suppression without precoding
CN111769879A (en) * 2020-06-16 2020-10-13 光创新电(苏州)信息科技有限公司 System for generating vector signal based on optical carrier suppression and using method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102882658A (en) * 2011-07-12 2013-01-16 联发科技股份有限公司 Signal transmitting methods and transmitters using the same
CN102882658B (en) * 2011-07-12 2016-06-08 联发科技股份有限公司 Emitter and method of communicating signals
CN104158781A (en) * 2014-08-28 2014-11-19 上海航天电子通讯设备研究所 FPGA (Field Programmable Gate Array)-based ultrahigh-speed APSK (Amplitude Phase Shift Keying) modulation method and modulation system
CN104158781B (en) * 2014-08-28 2018-03-27 上海航天电子通讯设备研究所 A kind of super high-speed A PSK modulator approaches and modulating system based on FPGA
CN111769876A (en) * 2020-06-16 2020-10-13 光创新电(苏州)信息科技有限公司 Vector millimeter wave signal generation system based on optical carrier suppression without precoding
CN111769879A (en) * 2020-06-16 2020-10-13 光创新电(苏州)信息科技有限公司 System for generating vector signal based on optical carrier suppression and using method thereof

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Application publication date: 20110330