CN104618303B - A kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing - Google Patents
A kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention discloses a kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing, by being modulated in whole BBP using restructural, demodulation module unit forms complete communication system, and compatible FSK is could be adjusted to demodulation mode, MSK, 2DPSK, tetra- kinds of wide variety of modulation systems of QDPSK, solve the reconfigurable module matching problem for sending generator terminal and receiver end, on the premise of communication system performance requirement is ensured, the modulation /demodulation pattern commonly used in the compatible communication technology and meet Project Realization, reduce configuration content, the complexity of algorithm and reconfigurable cell interconnection line is simplified, it is easily achieved.
Description
Technical field
The invention belongs to wireless communication technology field, more particularly to a kind of restructural modulatedemodulate being applied in Base-Band Processing
Tune method.
Background technology
All kinds of consumption electricity such as high speed development and low-power consumption, low cost in semiconductor and very large scale integration technology
Under the promotion of the tight demand of sub- product data communication, the continuous research and probe of people causes short-distance wireless communication technology to obtain
Quick raising.Current short-distance wireless communication technology is all directed to specific application field substantially, mainly includes
IEEE802.15.1 (Bluetooth standards), IEEE 802.11b (Wi-Fi), IrDA (infrared data communication technology), UWB
(super-broadband tech) and IEEE 802.15.4b (ZigBee standards) etc..
Short-distance wireless communication technology has the present situation of multimode multi-standard.While from the point of view of with its development pattern, existing
Multiple standards under, will also have new standard and develop according to respective technology path.And mean can for the appearance of new standard
It can need to reach different indexs and performance or the different designs of different application fields needs.Therefore, face new
Standard be accomplished by redesigning whole wireless communication system, while there is each side such as compatible, upgrading, adaptive in different system
Many difficult points in face.And the construction cycle of this mode is long, development cost is high.Therefore, the concept of software radio meet the tendency of and
Raw, its main thought is in the way of bus or exchange, some functionalization, modular hardware cell to be connected into one and opened
The generalization hardware platform of formula is put, and various channel radios are realized by the loading to scalable, reconfigurable application software
Telecommunication function, such as working frequency range, modulation /demodulation type, data format, encryption mode and communication protocol.
The proposition of software-defined radio concept so that improve systematic function and flexibility by the innovation on framework, oneself passes through
Become the development trend and study hotspot of the current communication technology.Reconfigurable processing framework due to its efficiently, flexibility the characteristics of,
Academia is just being received with industrial quarters more and more to pay attention to.Its construction characteristic, allows it fundamentally to solve communication system
The problem of system multimode multi-standard compatibility, flexibility and high-performance and the demand deposited are met, be one has perspective with challenging very much
The problem of property.
In recent ten years, academia in terms of restructural BBP to having done more in-depth study, and proposes
A series of modulation mapping schemes for solving multiple standards protocol-compliants, including：University of New South Wales (University of
New South Wales) propose mimo system in restructural launch scenario, the program is with the integrated multiple bases of streamline form
Processing unit with agreement, can the specific Base-Band Processing function of each pipeline processes unit execution of dynamic select
(Reconfigurable Pipelined Coprocessor for Multi-mode Communication
Transmission, Design Automation Conference (DAC), 201350th ACM/EDAC/IEEE, 2013)；
The reality that mapping scheme is modulated based on restructural of high-throughput under the high speed that the Institute of Technology of India (IIT Kharagpur) proposes
It is existing, including modulation system be GMSK and QPSK (Design and implementation of a generalized
Parametrizable modulator for a reconfigurable radio, TENCON 2009-2009IEEE
Region 10Conference, 2009).Although compatible different consensus standard in these schemes, can be by reconfiguring
Mode realize the conversion of modulation system, but the problem of individually modulation mapping scheme solve only transmission signal, for such as
What complete signal that receives still needs multiple demodulating systems, is unfavorable for the realization of communication system；In addition, some schemes wish to pass through
The Processing Algorithm realized required in Base-Band Processing reality is analyzed, some basic particulate units are utilized, it is possible to achieve at base band
Manage the algorithm of the basic module of device, although can more flexibly change systematic parameter in this scheme, realize BBP
Configurable mode, but configuration content it is complicated and changeable, it is contemplated that communication protocol it is more, configuration content will be more complicated, simultaneously
The complexity of interconnection line will be greatly increased while resource utilization is improved.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of be applied in Base-Band Processing
Restructural modulation-demo-demodulation method, by having been formed in whole BBP using restructural modulation /demodulation modular unit
The modulation /demodulation pattern commonly used in whole communication system, the compatible communication technology and meet Project Realization, reduce configuration content,
The complexity of algorithm and reconfigurable cell interconnection line has been simplified, has made it easy to realize.
Technical scheme：To achieve the above object, the restructural modulation /demodulation being applied in Base-Band Processing that the present invention is provided
Method, comprises the following steps：
(1) instruction that emitter is obtained to processor carries out Instruction decoding, and according to the parameter pre-set in processor
Modulation system and corresponding modulation parameter are determined, the parameter pre-set includes transmission code rate, modulation demodulation system, modulation
Frequency deviation, the parameter configuration of wave filter；
(2) using restructural modulation module according to serial data data a of the identified modulation system to processorkCarry out
Data processing obtains I/Q two-way fundamental frequency signals, and the data processing includes data prediction and waveform shaping；
(3) the I/Q two paths of signals is sent into analog-to-digital conversion device to enter the loading of horizontal electrical signal to obtain modulated signal concurrent
Penetrate；
(4) receiver carries out signal reception, and analogue data obtains signal of the I/Q two-way with intermediate frequency, root by analog-to-digital conversion
The result decoded according to receiver side processor instruction determines to receive the correspondence demodulation side prestored in the modulation system and the machine of signal
Formula；
(5) BBP original is restored to the target signal filter interference information with intermediate frequency using restructural demodulation module
The I/Q two-way fundamental frequency signals of beginning, the phase error in I/Q two-way fundamental frequency signals is filtered out using the mode of phase difference；
(6) judgement being demodulated to different modulating mode using the difference interval and different threshold values that pre-set, most
The demodulation to whole data flow is realized eventually.
Wherein, in order to simplify the complexity of algorithm and reconfigurable cell interconnection line, the compatible four kinds of tune of the inventive method
Mode processed, be respectively：FSK、MSK、2DPSK、QDPSK.
Wherein, according to the data processing method of four kinds of modulation systems, the restructural modulation module in step (2) includes following
Modular unit：
Restructural stores arithmetic element, for the information that is stored according to RAM memory and input information in the way of tabling look-up
Output result is obtained, or reconfigures according to the instruction of processor information that RAM memory stored to complete corresponding computing
Function；
Restructural MLA operation unit, the multiplication function for realizing complement code based on Booth encryption algorithms, and with
The result of booth multiplier elementary cell is added up and realizes multiply-add function by Wallace Tree patterns；
Restructural accumulating operation unit, be overlapped during by modulated process using phase information modulated signal based on
Calculate；
Serioparallel exchange unit, for serial data data all the way to be converted into two-way information；
Differential coding unit, for carrying out differential coding to data message.
Wherein, in order to realize the saving resource of circuit maximum possible, algorithm, which is carried out, to be realized to above-mentioned four kinds of modulation systems
The different data prediction modes of different modulation systems correspondence, as follows respectively in adjustment, step (2)：FSK modulation mode institute
Corresponding data prediction mode is by the serial data data a of the processorkOver-sampling is carried out by high frequency clock to obtain
Data sequence bk-fsk；Data prediction mode corresponding to 2DPSK modulation systems is by the serial data data of the processor
akData sequence b is obtained by differential coding unitk-2dpsk；Data prediction mode corresponding to MSK modulation systems is first by institute
State the serial data data a of processorkThrough differential coding unit, afterwards into serioparallel exchange unit, over-sampling obtains two ways
According to sequence qk-mskAnd pk-msk；Data prediction mode corresponding to QDPSK modulation systems is first by the serial ratio of the processor
Special data akTwo paths of data sequence a is obtained by serioparallel exchange unitk-qdpskAnd bk-qdpsk, then obtain by differential coding unit
Data sequence ck-qdpskAnd dk-qdpsk。
The different waveform shaping mode of different modulation systems correspondence in step (2), each modulation system passes through waveform shaping
I/Q two paths of signals is generated, it is as follows respectively：For FSK modulation mode, by sequence bk-fskBy restructural MLA operation unit and
The phase angle information that restructural accumulating operation unit is changed using frequency uses cordic algorithm, produces I/Q two paths of signals；For
MSK, 2DPSK and QDPSK modulation system, realize half-wave shaping, by counting over-sampling by restructural storage arithmetic element
Analysis, store the sine and cosine signal that the arithmetic element internal RAM storage cycle is 2 times of transmission code rate cycle to restructural,
According to the data sequence obtained after respective data prediction, I/Q two paths of signals is obtained by way of look-up table.
Wherein, according to the data processing method of four kinds of modulation systems, the restructural demodulation module in step (5) includes following
Modular unit：
Restructural stores arithmetic element, for the information that is stored according to RAM memory and input information in the way of tabling look-up
Output result is obtained, or reconfigures according to the instruction of processor information that RAM memory stored to complete corresponding computing
Function；
Restructural MLA operation unit, the multiplication function for realizing complement code based on Booth encryption algorithms, and with
The result of booth multiplier elementary cell is added up and realizes multiply-add function by Wallace Tree patterns；
Restructural accumulating operation unit, enters during in demodulating process using phase information and feedback information demodulated signal
Row superposition calculation.
Wherein, the original I/Q two-way fundamental frequency signals of reduction BBP in step (5), comprise the following steps：
Utilize what is realized with emitter side identical restructural MLA operation unit and restructural accumulating operation unit
Cordic algorithm circuit produces intermediate-freuqncy signal cos (wct)、sin(wcT), then by restructural MLA operation unit, realize and poor
The calculating of angle formula, filters out the intermediate frequency component w in original I/Q two paths of signalsc, and gained signal is passed through into low pass filter；
For FSK, MSK modulation system, the I/Q two paths of signals of emitter original transmitted is obtained by above-mentioned steps；For
2DPSK and QDPSK modulation systems, in addition it is also necessary to store arithmetic element using restructural and remove fundamental frequency with poor formula and can just obtain
The I/Q two paths of signals of emitter original transmitted.
Wherein, the threshold value difference of each modulation system is as follows in step (6)：FSK and MSK threshold value is that 0,2DPSK threshold values are
Pi/2, QDPSK has 3 threshold values, respectively π/4,3 π/4,5 π/4.
Beneficial effect：Using the modulation /demodulation module of restructural, and different modulating mode is set in modulation and demodulation process
In data processing, on the premise of communication system performance requirement is ensured, algorithm is realized using rational, compatible FSK, MSK,
2DPSK and the modulation and demodulation method of QDPSK various modes, adapt to the changeable present situation of current communication system protocol standard；Due to adopting
With restructural modulation /demodulation module, flexibly systematic parameter can be reconfigured to realize by the conversion to instruction, from
And realize the function of modules in radio communication modulation /demodulation.For various single modulation demodulation systems, algorithm
Analysis can find that systematic function is suitable therewith, can reach the requirement of communication system with emulation；Can compared to what is currently proposed
Reconstruct modulation mapping mode, adds the restructural demodulation modes of system, makes the restructural pattern realization of communication system more complete
It is whole, it can apply to Project Realization；Compared to common various selectable modulation demodulation system, restructural pattern can cause
System improves resource utilization.
Brief description of the drawings
Fig. 1 modulates flow chart for the restructural of the inventive method；
Fig. 2 demodulates flow chart for the restructural of the inventive method；
Fig. 3 is compared for each modulation demodulation system in the inventive method under Gaussian channel with the error bit ability of theoretical value
Figure；
Fig. 4 is each modulation demodulation system in the inventive method is in the presence of frequency modulation and is not added with frequency offset processing
Error bit ability compares figure.
Embodiment
The present invention is further described with reference to embodiment.
Restructural modulation /demodulation module in the present embodiment uses the modular unit of following basic granules：
Restructural stores arithmetic element, and the information needed is stored by random access memory (RAM), inputs information to look into
The mode of table is looked for obtain output result and export.When the instruction of processor changes, it is necessary to which restructural storage arithmetic element is complete
Into other calculation functions, the information of RAM storages can be reconfigured to reach the demand of New function.
Restructural MLA operation unit, based on Booth encryption algorithms, realizes the multiplication of the data of two 8bit bandwidth
The elementary cell of device, and added up the result of booth multiplier elementary cell in the way of Wallace Tree patterns, it is real
Existing multiply-add result.Most basic multiply-add operation can be realized by Wallace Tree patterns：
yout=a*b+c*d
Most multiplication in baseband modulation and demodulation algorithm can use restructural MLA operation unit with add operation
Realize.
In restructural accumulating operation unit, modulation-demodulation circuit, different modulated signals are obtained by phase modulation information,
The two kind arithmetic elements above-mentioned except to use the present invention are typically employed in iterative algorithm, algorithm to obtaining phase information
Outside, in addition it is also necessary to use the feedback information of superposition, it is therefore of the invention using restructural accumulating operation unit.
Serial data data all the way, for MSK and QDPSK both of which, are converted to two-way by serioparallel exchange unit
Information, so using shared serioparallel exchange unit.
Differential coding unit, MSK, QDPSK and BPSK Three models, it is necessary to data message carry out differential coding, so as to
It is relatively easy in the unified realization of demodulating algorithm, and selects differential coding unit, but needs to realize two kinds of differential coding modes,
Wherein MSK and BPSK is single channel difference, and coding rule isQDPSK coding rules are correspondence two-way code element akbk
Respectively " 00 ", " 01 ", " 11 ", " 10 " when, phase angular transformation Δ θ is respectively " 3/4 π ", " 1/4 π ", " -3/4 π ", " -1/4 π ".
The detailed process that modulation /demodulation is realized is as follows：
(1) determine the compatible modulator approach of reconfigurable modem, including the most frequently used FSK, MSK, 2PSK and
QPSK, pre-sets some parameters of processor, including：Transmission code rate, modulation demodulation system, frequency modulation, the ginseng of wave filter
Number configuration.
(2) modular unit of above-mentioned basic granules is determined, the computing that reconfigurable circuit is realized is completed, presets four
Data processing method of the modulation system in modulated process and the data processing method in corresponding demodulating process, data processing side
Formula is sent to the processor for sending generator terminal or receiver end by instruction type, as depicted in figs. 1 and 2, is gone here and there in the present embodiment with SPI
Instruction is sent to processor by row Peripheral Interface, for that can be weighed according to data processing method scheduling in follow-up modulation, demodulation
Structure modular unit realizes corresponding function.
(3) adjust several modulation-demo-demodulation methods realizes algorithm, makes the saving resource for realizing circuit maximum possible.Wherein
FSK and MSK is realized by phase angle difference and demodulated.Therefore 2PSK and QPSK uses 2DPSK and QDPDK modulation systems, in modulation
First pass through before and different difference processings are carried out to data, in demodulation by the difference of one code-element period in phase angle come reduction number
According to.
(4) as described above, representing the data processing in modulated process to Transmitter processor by the obtained pool of instructions of SPI
Mode is indicated, modulates flow according to Fig. 1 restructural, the result that transmitter terminal is decoded by processor instruction first is to processor
Serial data data akCarry out data prediction.
Wherein, FSK modulation mode data only carry out over-sampling by high frequency clock and obtain new sequence bk-fsk；2DPSK is adopted
Single channel difference is used, coding rule isData sequence b is obtained by differential coding unitk-2dpsk；MSK is using single
Road difference, coding rule isFirst through differential coding unit, afterwards into serioparallel exchange unit, over-sampling is obtained
Two paths of data sequence qk-mskAnd pk-msk；QDPSK first passes through serioparallel exchange unit and obtains two paths of data sequence ak-qdpskAnd bk-qdpsk,
The coded system advised afterwards using International Telecommunication Union's telecommunication standardsization tissue (ITU-T) carries out differential coding, and it is compiled
Code rule is correspondence two-way input signal code element akbkWith the previous period symbols c of output signalkdkRespectively " 00 ", " 01 ",
When " 11 ", " 10 ", corresponding phase angle θ be respectively " 1/2 π ", " 0 ", " 3/2 π ", " π " two phase angle sums be current period it is defeated
Go out the corresponding phase angle of code element, so as to obtain current period output symbol ckdk, finally obtain ck-qdpskAnd dk-qdpsk, so far, number
Data prediction is realized to each modulation system by decoding instruction according to processing.
(5) data sequence respectively to various modulation systems by pretreatment carries out phase angle computing and realizes waveform shaping,
The I/Q two paths of signals of final output is generated, I/Q two paths of signals is subjected to digital-to-analogue conversion, signal transmitting is finally modulated.
Wherein, fsk signal realizes that CORDIC is calculated by restructural MLA operation unit and restructural accumulating operation unit
Method, produces I road signal cos [2 π fdT+ θ (t)] and Q roads signal sin [2 π fdT+ θ (t)], in formula, fdIt is now in zero for intermediate frequency
Frequency signal fd=0,MSK, 2DPSK and QDPSK modulation system are real by restructural storage arithmetic element
Existing half-wave shaping, by the analysis counted over-sampling, stores arithmetic element internal RAM by restructural and stores the transmission code rate cycle
2 times of sine and cosine signal, the data sequence after being pre-processed using each modulation system and obtained by way of look-up table
To I/Q two paths of signals, the I roads signal that MSK is obtained isQ roads signal isTwo paths of signals phase
Subtract and can obtain msk signal；The I roads signal that 2DPSK is obtained is cos (w0t+θk), Q roads signal is sin (w0t+θk)；QDPSK's
I roads signal is ck-qdpsk cos(w0T), Q roads signal is dk-qdpsksin(w0T), wherein,θk=-π/4 ± pi/2, Ts
For the transmission data cycle.
(6) as described above, the pool of instructions that SPI is sent represents the data processing method to receiver processor in demodulating process
Indicate, demodulate flow according to Fig. 2 restructural, receiver carries out signal reception, and analogue data passes through the I/Q that analog-to-digital conversion is obtained
Signal of the two-way with intermediate frequency be respectivelyWithFirst pass through lower mixting circuit utilize and
Declinate formula filters out intermediate-freuqncy signal, while playing the effect for filtering out Image interference to system, is specially：The circuit first with
The cordic algorithm circuit that emitter identical restructural MLA operation unit and restructural accumulating operation unit are realized, is produced
Intermediate-freuqncy signal cos (wct)、sin(wcT), then by restructural MLA operation unit, the calculating with declinate formula is realized, original is filtered out
Intermediate frequency component w in beginning I/Q two paths of signalsc, signal afterwards filters out Image interference height that may be present by low pass filter
Frequency signal, wherein, low pass filter uses finite impulse response filter FIR, is filtered using restructural storage arithmetic element storage
Ripple device coefficient, standard FIR filter is realized by multiple restructural MLA operation unitsCoefficient with
The calculating process of signal, the I/Q two paths of signals of each modulation system emitter original transmitted finally given, FSK modulation mode
I/Q two paths of signals is cos [θ (t)] and sin [θ (t)]；The I/Q two paths of signals of MSK modulation systems isWith2DPSK I/Q two paths of signals is cos (w0t+θk) and sin (w0t+θk), whereinθk=-π/4 ±
Pi/2, TsFor the transmission data cycle；QDPSK I roads signal is ck-qdpsk cos(w0T), Q roads signal is dk-qdpsksin(w0t).This
When, FSK and MSK I/Q two paths of signals are zero intermediate frequency signals, and 2DPSK is related with code check for band to QDPSK I/Q two paths of signals
Fundamental frequency and initial phase signal, realized and demodulated by initial phase difference, 2DPSK and QDPSK first will remove fundamental frequency by one
Circuit, obtain an only I/Q two paths of signals related to initial phase, arithmetic element stored specifically by using restructural
This fundamental frequency signal cos (w are produced in the way of LUT0T) with sin (w0T), then by removing fundamental frequency with poor formula, initial phase is obtained
Value cos (the θ of the sine and cosine of parallactic anglek) and cos (θk), wherein, for 2DPSK modulation systems, θk=-π/4 ± pi/2, for
QDPSK modulation systems, θk=± π/4, ± 3 π/4.
(7) because the not synchronous of initial phase will produce Δ θ phase error, so afterwards will also be by seeking phase
The mode of potential difference filters out this error.The I/Q two paths of signals obtained in step (6) stores arithmetic element by restructural, utilizes
The phase angle information of RAM storages, obtains exporting the phase of sampled point according to the input value of I/Q two paths of signals in the way of look-up table
Angle information, then the Δ θ that intermediate-freuqncy signal is produced is filtered out by way of difference is sought at phase angle, it is using different difference intervals
Decay time is realized asks poor to the phase angle of different modulating mode.
MSK and FSK due to signal the frequency when transmitting signal " 1 " be on the occasion of, therefore sampled point phase angle is being continuously increased,
Frequency is negative value when transmitting signal " 0 ", and sampled point phase angle is constantly reducing, and can judge to transmit by the positive and negative values of phase difference
Signal；2DPSK realizes demodulation judgement, phase difference, which changes this, to be recognized due to differential coding using the phase difference of initial phase
It is constant to transmit signal " 1 ", think transmission signal " 0 "；Equally, QPDSK is due to differential coding rule, phase angle difference result
Absolute value have four kinds of possibility, can be by the two code elements transmitted with threshold value multilevel iudge.The time delay of phase difference, MSK
Determined with FSK by over-sampling rate, 2DPSK postpones a signal period, QDPSK postpones two signal periods, according to above-mentioned analysis
It is determined that the threshold value of demodulation judgement：FSK and MSK are adjudicated by positive and negative values, therefore threshold value is " 0 "；2DPSK phase difference absolute values are respectively
" 0 " and " π ", therefore threshold value is pi/2；QDPSK has 3 threshold values, respectively π/4,3 π/4,5 π/4.
The present embodiment has carried out emulation experiment to the restructural modulation-demo-demodulation method that the inventive method is provided, by configuring string
Row Peripheral Interface SPI instructs to change the configuration content of system and the relation of interconnection line to realize different modulation systems and biography
Defeated code check.
It is identical with the theoretical scheme that FSK is demodulated because MSK demodulation modes use coherent differential demodulation, be only
Modulation system and frequency modulation are variant, so theoretic bit error rate is all mutually：1/2exp (- r/4), wherein r are noise
Than.Similarly, 2DPSK and QDPSK returns theoretical bit error rate for 1/2exp (- r/2).In the situation that transmission rate is 300kbps
Under, by simulation analysis and compare it can be found that：In Fig. 3, the performance of restructural modulation demodulation system is close to theoretical value, in short distance
Under requirement from the bit error rate of radio communication 1%, MSK and FSK respectively 11.3dB and 11.6dB with theoretical value about
0.3dB and 0.6dB performance loss, 2DPSK and QDPSK substantially in 8.7dB or so, there is about 0.9dB property with theoretical value
The loss of energy.It can be seen that, the increase of bit error rate is substantially by originals such as the truncations of quantization error and algorithm calculation process process of system
Because facilitating, the bit error rate requirement of short distance radio communication system is fully achieved.
It is 300kbps in transmission rate, frequency shift (FS) is that emulation obtains Fig. 4 in the case of 20kbps, can be with by contrast
It was found that：Under 20kbps frequency modulation, systematic function substantially loses 0.5dB, under the signal to noise ratio that can reach 12dB, worst case
Below 1% bit error rate.
Claims (6)
1. a kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing, it is characterised in that the compatible four kinds of modulation of this method
Mode, respectively FSK, MSK, 2DPSK, QDPSK, comprise the following steps：
(1) instruction that emitter is obtained to processor carries out Instruction decoding, and is determined according to the parameter pre-set in processor
Modulation system and corresponding modulation parameter, the parameter pre-set include transmission code rate, modulation demodulation system, modulation frequency
Partially, the parameter configuration of wave filter；
(2) using restructural modulation module according to serial data data a of the identified modulation system to processorkCarry out data
Processing obtains I/Q two-way fundamental frequency signals, and the data processing includes data prediction and waveform shaping；
(3) the I/Q two paths of signals is sent to analog-to-digital conversion device enters the loading of horizontal electrical signal and obtain modulated signal and launch；
(4) receiver carries out signal reception, and analogue data obtains signal of the I/Q two-way with intermediate frequency by analog-to-digital conversion, according to connecing
The result for receiving the decoding of pusher side processor instruction determines to receive the corresponding demodulation mode prestored in the modulation system and the machine of signal；
(5) to restore BBP to the target signal filter interference information with intermediate frequency using restructural demodulation module original
I/Q two-way fundamental frequency signals, the phase error in I/Q two-way fundamental frequency signals is filtered out using the mode of phase difference；
(6) judgement being demodulated to different modulating mode using the difference interval and different threshold values that pre-set, it is final real
Now to the demodulation of whole data flow；
Restructural modulation module in the step (2) includes following modular unit：
Restructural stores arithmetic element, and the information and input information for being stored according to RAM memory are obtained in the way of tabling look-up
Output result, or reconfigure according to the instruction of processor information that RAM memory stored to complete corresponding calculation function；
Restructural MLA operation unit, the multiplication function for realizing complement code based on Booth encryption algorithms, and with
The result of booth multiplier elementary cell is added up and realizes multiply-add function by Wallace Tree patterns；
Restructural accumulating operation unit, calculating is overlapped during in modulated process using phase information modulated signal；
Serioparallel exchange unit, for serial data data all the way to be converted into two-way information；
Differential coding unit, for carrying out differential coding to data message.
2. the restructural modulation-demo-demodulation method according to claim 1 being applied in Base-Band Processing, it is characterised in that step
(2) the different data prediction mode of different modulation systems correspondence, as follows respectively in：Data corresponding to FSK modulation mode
Pretreatment mode is by the serial data data a of the processorkOver-sampling, which is carried out, by high frequency clock obtains data sequence
bk-fsk；Data prediction mode corresponding to 2DPSK modulation systems is by the serial data data a of the processorkBy difference
Coded unit obtains data sequence bk-2dpsk；Data prediction mode corresponding to MSK modulation systems is first by the processing
The serial data data a of devicekThrough differential coding unit, afterwards into serioparallel exchange unit, over-sampling obtains two paths of data sequence
qk-mskAnd pk-msk；Data prediction mode corresponding to QDPSK modulation systems is first by the serial data data of the processor
akTwo paths of data sequence a is obtained by serioparallel exchange unitk-qdpskAnd bk-qdpsk, then obtain data sequence by differential coding unit
Arrange ck-qdpskAnd dk-qdpsk。
3. the restructural modulation-demo-demodulation method according to claim 2 being applied in Base-Band Processing, it is characterised in that step
(2) the different waveform shaping mode of different modulation systems correspondence in, each modulation system generates I/Q two-way by waveform shaping and believed
Number, it is as follows respectively：For FSK modulation mode, by sequence bk-fskPass through restructural MLA operation unit and the cumulative fortune of restructural
Calculate unit and use cordic algorithm using the phase angle information of frequency change, produce I/Q two paths of signals；For MSK, 2DPSK and
QDPSK modulation systems, realize half-wave shaping by restructural storage arithmetic element, pass through the analysis counted over-sampling, Xiang Ke
The reconstruct storage arithmetic element internal RAM storage cycle is the sine and cosine signal in 2 times of transmission code rate cycle, according to respective data
The data sequence obtained after pretreatment, obtains I/Q two paths of signals by way of look-up table.
4. a kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing, it is characterised in that the compatible four kinds of modulation of this method
Mode, respectively FSK, MSK, 2DPSK, QDPSK, comprise the following steps：
(1) instruction that emitter is obtained to processor carries out Instruction decoding, and is determined according to the parameter pre-set in processor
Modulation system and corresponding modulation parameter, the parameter pre-set include transmission code rate, modulation demodulation system, modulation frequency
Partially, the parameter configuration of wave filter；
(2) using restructural modulation module according to serial data data a of the identified modulation system to processorkCarry out data
Processing obtains I/Q two-way fundamental frequency signals, and the data processing includes data prediction and waveform shaping；
(3) the I/Q two paths of signals is sent to analog-to-digital conversion device enters the loading of horizontal electrical signal and obtain modulated signal and launch；
(4) receiver carries out signal reception, and analogue data obtains signal of the I/Q two-way with intermediate frequency by analog-to-digital conversion, according to connecing
The result for receiving the decoding of pusher side processor instruction determines to receive the corresponding demodulation mode prestored in the modulation system and the machine of signal；
(5) to restore BBP to the target signal filter interference information with intermediate frequency using restructural demodulation module original
I/Q two-way fundamental frequency signals, the phase error in I/Q two-way fundamental frequency signals is filtered out using the mode of phase difference；
(6) judgement being demodulated to different modulating mode using the difference interval and different threshold values that pre-set, it is final real
Now to the demodulation of whole data flow；
Restructural demodulation module in the step (5) includes following modular unit：
Restructural stores arithmetic element, and the information and input information for being stored according to RAM memory are obtained in the way of tabling look-up
Output result, or reconfigure according to the instruction of processor information that RAM memory stored to complete corresponding calculation function；
Restructural MLA operation unit, the multiplication function for realizing complement code based on Booth encryption algorithms, and with
The result of booth multiplier elementary cell is added up and realizes multiply-add function by Wallace Tree patterns；
Restructural accumulating operation unit, is folded during in demodulating process using phase information and feedback information demodulated signal
Plus calculate.
5. the restructural modulation-demo-demodulation method according to claim 4 being applied in Base-Band Processing, it is characterised in that step
(5) the original I/Q two-way fundamental frequency signals of the reduction BBP, comprise the following steps in：
Utilize what is realized with emitter side identical restructural MLA operation unit and restructural accumulating operation unit
Cordic algorithm circuit produces intermediate-freuqncy signal cos (wct)、sin(wcT), then by restructural MLA operation unit, realize and poor
The calculating of angle formula, filters out the intermediate frequency component w in original I/Q two paths of signalsc, and gained signal is passed through into low pass filter；
For FSK, MSK modulation system, the I/Q two paths of signals of emitter original transmitted is obtained by above-mentioned steps；For 2DPSK
With QDPSK modulation systems, in addition it is also necessary to store arithmetic element using restructural and remove fundamental frequency with poor formula and can just be launched
The I/Q two paths of signals of machine original transmitted.
6. the restructural modulation-demo-demodulation method according to claim 5 being applied in Base-Band Processing, it is characterised in that step
(6) the threshold value difference of each modulation system is as follows in：FSK and MSK threshold value is that 0,2DPSK threshold values are pi/2, and QDPSK has 3 thresholds
Value, respectively π/4,3 π/4,5 π/4.
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| CN106155814B (en) * | 2016-07-04 | 2019-04-05 | 合肥工业大学 | A kind of reconfigurable arithmetic unit that supporting multiple-working mode and its working method |
| CN107317603B (en) * | 2017-07-03 | 2020-12-18 | 河南省科学院应用物理研究所有限公司 | Power line communication method and system and power line communication terminal |
| CN108243130B (en) * | 2018-01-10 | 2020-10-02 | 四川阵风科技有限公司 | Demodulation method, demodulation device, spectrum detector and computer readable storage medium |
| CN108243131B (en) * | 2018-01-10 | 2020-10-02 | 四川阵风科技有限公司 | Demodulation method, demodulation device, spectrum detector and computer readable storage medium |
| CN112702292B (en) * | 2020-12-15 | 2022-12-09 | 中电科思仪科技股份有限公司 | Baseband code element mapping method based on lookup table |
| CN115086126B (en) * | 2021-03-12 | 2023-12-26 | 鹤壁天海电子信息系统有限公司 | GMSK signal-based synchronization method, device and computer-readable storage medium |
| CN113922860B (en) * | 2021-09-14 | 2022-07-12 | 中国科学院国家空间科学中心 | Satellite-ground measurement, operation and control integrated baseband processing system for small satellite in medium and low orbit |
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| CN114553646B (en) * | 2022-01-09 | 2023-03-31 | 苏州大学 | Reconfigurable modulation-demodulation system based on WBAN (white blood cell network) narrowband physical layer |
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