CN104618303A - Reconfigurable modulation and demodulation method applied to baseband processing - Google Patents
Reconfigurable modulation and demodulation method applied to baseband processing Download PDFInfo
- Publication number
- CN104618303A CN104618303A CN201510061216.3A CN201510061216A CN104618303A CN 104618303 A CN104618303 A CN 104618303A CN 201510061216 A CN201510061216 A CN 201510061216A CN 104618303 A CN104618303 A CN 104618303A
- Authority
- CN
- China
- Prior art keywords
- modulation
- restructural
- data
- demodulation
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention discloses a reconfigurable modulation and demodulation method applied to baseband processing. A complete communication system is formed by reconfigurable modulation and demodulation modularized units in a whole baseband processor, the demodulation mode is adjusted to be compatible to four widely-applied modulation modes including the FSK modulation mode, the MSK modulation mode, the 2DPSK modulation mode and the QDPSK modulation mode, and therefore matching between a reconfigurable module of a transmitter terminal and a reconfigurable module of a receiver terminal is achieved; on the premise that the performance requirements of the communication system are met, the reconfigurable modulation and demodulation method is compatible to the common modulation and demodulation modes in the communication technology, and meets the requirements of engineering realization, the configuration content is reduced, the algorithm is simplified, complexity of interconnection lines of the reconfigurable units is reduced, and realization is easy.
Description
Technical field
The invention belongs to wireless communication technology field, particularly relate to a kind of restructural modulation-demo-demodulation method be applied in Base-Band Processing.
Background technology
Under the promotion of semiconductor and the high speed development of very large scale integration technology and the tight demand of all kinds of consumption electronic product data communication such as low-power consumption, low cost, the continuous research and probe of people makes short-distance wireless communication technology obtain quick raising.Current short-distance wireless communication technology, substantially all for specific application, mainly comprises IEEE802.15.1 (Bluetooth standard), IEEE 802.11b (Wi-Fi), IrDA (infrared data communication technology), UWB (super-broadband tech) and IEEE 802.15.4b (ZigBee standard) etc.
Short-distance wireless communication technology also exists the present situation of the many standards of multimode.Simultaneously with its development pattern, under existing multiple standards, also develop having new standard according to respective technology path.And the appearance of new standard means that may need to reach different indexs and performance or different applications needs different designs.Therefore, regarding to new standard just needs to redesign whole wireless communication system, and simultaneously different systems exists many difficult points of each side such as compatibility, upgrading, self adaptation.And the construction cycle of this mode is long, development cost is high.Therefore, the concept of software radio is arisen at the historic moment, its main thought is the mode with bus or exchange, some functionalization, modular hardware cell are connected into an open generalization hardware platform, and by realizing various radio communication function to the loading of scalable, reconfigurable application software, as working frequency range, modulation /demodulation type, data format, encryption mode and communication protocol etc.
The proposition of software-defined radio concept, makes to improve systematic function and flexibility by the innovation on framework, and oneself is through becoming development trend and the study hotspot of the current communication technology.Reconfigurable processing framework, because it is efficient, flexibility, is just receiving academia and industrial quarters is more and more paid attention to.Its construction characteristic, makes it fundamentally can solve the problem of communication system multimode multi-standard compatibility, and meet flexibility and high-performance and the demand of depositing, be one has perspective and challenging problem very much.
In recent ten years, comparatively deep research has been done to restructural baseband processor aspect by academia, and propose the modulation mapping scheme of a series of solution multiple standards protocol-compliant, comprise: the restructural launch scenario in the mimo system that University of New South Wales (University ofNew South Wales) proposes, the program is with the processing unit of the integrated multiple baseband protocol of streamline form, dynamic selects each pipeline processes unit to perform specific Base-Band Processing function (Reconfigurable Pipelined Coprocessor for Multi-mode Communication Transmission, Design Automation Conference (DAC), 201350th ACM/EDAC/IEEE, 2013), the realization based on restructural modulation mapping scheme of high-throughput under the high speed that the Institute of Technology of India (IIT Kharagpur) proposes, the modulation system comprised is GMSK and QPSK (Design and implementation of a generalized parametrizablemodulator for a reconfigurable radio, TENCON 2009-2009IEEE Region 10Conference, 2009).Although the different consensus standard of compatibility in these schemes, the conversion of modulation system can be realized by the mode reconfigured, but independent modulation mapping scheme solve only the problem sending signal, for how complete Received signal strength still needs multiple demodulating system, be unfavorable for the realization of communication system; In addition, some schemes are wished by the Processing Algorithm realized required in as analysed basis tape handling reality, utilize the particulate units that some are basic, the algorithm of the basic module of baseband processor can be realized, although system parameters can be changed more flexibly in this scheme, realize the configurable mode of baseband processor, but deploy content is complicated and changeable, the communication protocol considered is more, deploy content will be more complicated, greatly will increase the complexity of interconnection line while improving resource utilization simultaneously.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of restructural modulation-demo-demodulation method be applied in Base-Band Processing, complete communication system is formed by adopting restructural modulation /demodulation modular unit in whole baseband processor, conventional modulation /demodulation pattern in the compatible communication technology and meet Project Realization, reduce deploy content, simplify the complexity of algorithm and reconfigurable cell interconnection line, made it to be easy to realize.
Technical scheme: for achieving the above object, the restructural modulation-demo-demodulation method be applied in Base-Band Processing provided by the invention, comprises the following steps:
(1) transmitter carries out Instruction decoding to the instruction that processor obtains, and according to the parameter determination modulation system pre-set in processor and corresponding modulation parameter, described in the parameter that pre-sets comprise the parameter configuration of transmission code rate, modulation demodulation system, frequency modulation, filter;
(2) utilize restructural modulation module according to the serial data data a of determined modulation system to processor
kcarry out data processing and obtain I/Q two-way fundamental frequency signal, described data processing comprises data prediction and waveform shaping;
(3) described I/Q two paths of signals is sent to the loading that analog-to-digital conversion device carries out the signal of telecommunication obtain modulation signal and launch;
(4) receiver carries out Signal reception, and analogue data obtains the signal of I/Q two-way band intermediate frequency through analog-to-digital conversion, according to the corresponding demodulation mode prestored in the modulation system of the result determination Received signal strength of receiver side processor instruction decoding and the machine;
(5) utilize the target signal filter interfere information of restructural demodulation module to described band intermediate frequency to restore the original I/Q two-way fundamental frequency signal of baseband processor, utilize the phase error in the mode filtering I/Q two-way fundamental frequency signal of phase difference;
(6) adopt the difference interval and different threshold value that pre-set to carry out the judgement of demodulation to different modulating mode, finally realize the demodulation to whole data flow.
Wherein, in order to simplify the complexity of algorithm and reconfigurable cell interconnection line, the compatible four kinds of modulation systems of the inventive method, have been 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) comprises following modular unit:
Restructural stores arithmetic element, obtains Output rusults for the information that stores according to RAM memory and input information in the mode of tabling look-up, or reconfigures according to the instruction of processor the information that RAM memory stores and complete corresponding calculation function;
Restructural multiply-add operation unit, for realizing the multiplication function of complement code based on Booth encryption algorithm, and takes advantage of add function with the realization of the result of booth multiplier elementary cell being added up of Wallace Tree pattern;
Restructural accumulating operation unit, carries out superposition calculation for utilizing in modulated process during phase information modulation signal;
Serioparallel exchange unit, for being converted to two-way information by the serial data data on a road;
Differential coding unit, for carrying out differential coding to data message.
Wherein, in order to the saving resource of realizing circuit maximum possible, the implementation algorithm of above-mentioned four kinds of modulation systems is adjusted, the data prediction mode that modulation systems different in step (2) is corresponding different is as follows respectively: the data prediction mode corresponding to FSK modulation mode is by the serial data data a of described processor
kcarry out over-sampling through high frequency clock and obtain data sequence b
k-fsk; Data prediction mode corresponding to 2DPSK modulation system is by the serial data data a of described processor
kdata sequence b is obtained through differential coding unit
k-2dpsk; Data prediction mode corresponding to MSK modulation system is first by the serial data data a of described processor
kthrough differential coding unit, enter serioparallel exchange unit afterwards, over-sampling obtains two paths of data sequence q
k-mskand p
k-msk; Data prediction mode corresponding to QDPSK modulation system is first by the serial data data a of described processor
ktwo paths of data sequence a is obtained through serioparallel exchange unit
k-qdpskand b
k-qdpsk, then obtain data sequence c through differential coding unit
k-qdpskand d
k-qdpsk.
The waveform shaping mode that modulation systems different in step (2) is corresponding different, each modulation system generates I/Q two paths of signals by waveform shaping, as follows respectively: for FSK modulation mode, by sequence b
k-fskutilize the phase angle information of frequency change to adopt cordic algorithm by restructural multiply-add operation unit and restructural accumulating operation unit, produce I/Q two paths of signals; For MSK, 2DPSK and QDPSK modulation system, store arithmetic element through restructural and realize half-wave shaping, by the analysis of counting to over-sampling, storing the arithmetic element internal RAM memory cycle to restructural is the transmission code rate cycle sine of 2 times and cosine signal, according to the data sequence obtained after respective data prediction, obtain I/Q two paths of signals by the mode of look-up table.
Wherein, according to the data processing method of four kinds of modulation systems, the restructural demodulation module in step (5) comprises following modular unit:
Restructural stores arithmetic element, obtains Output rusults for the information that stores according to RAM memory and input information in the mode of tabling look-up, or reconfigures according to the instruction of processor the information that RAM memory stores and complete corresponding calculation function;
Restructural multiply-add operation unit, for realizing the multiplication function of complement code based on Booth encryption algorithm, and takes advantage of add function with the realization of the result of booth multiplier elementary cell being added up of Wallace Tree pattern;
Restructural accumulating operation unit, carries out superposition calculation for utilizing in demodulating process when phase information and feedback information restituted signal.
Wherein, the I/Q two-way fundamental frequency signal that in step (5), reduction baseband processor is original, comprises the following steps:
The cordic algorithm circuit utilizing the restructural multiply-add operation unit identical with transmitter side and restructural accumulating operation unit to realize produces intermediate-freuqncy signal cos (w
ct), sin (w
ct), then by restructural multiply-add operation unit, the calculating of realization and declinate formula, the intermediate frequency component w in filtering original I/Q two paths of signals
c, and by gained signal through low pass filter;
For FSK, MSK modulation system, obtain the I/Q two paths of signals of transmitter original transmitted through above-mentioned steps; For 2DPSK and QDPSK modulation system, also need utilize restructural to store arithmetic element and remove with difference formula the I/Q two paths of signals that fundamental frequency just can obtain transmitter original transmitted.
Wherein, in step (6), the threshold value of each modulation system is as follows respectively: the threshold value of FSK and MSK is 0,2DPSK threshold value is pi/2, and QDPSK has 3 threshold values, is respectively π/4,3 π/4,5 π/4.
Beneficial effect: utilize reconfigurable modulation /demodulation module, and set the data processing of different modulating mode in modulation and demodulation process, ensureing under the prerequisite that communication system performance requires, adopt rational implementation algorithm, the modulation and demodulation method of compatible FSK, MSK, 2DPSK and QDPSK various modes, adapts to the present situation that current communication system protocol standard is changeable; Owing to have employed restructural modulation /demodulation module, by realizing reconfiguring system parameters flexibly to the conversion of instruction, thus the function of modules in radio communication modulation /demodulation can be realized.For various independent modulation demodulation system, Algorithm Analysis and emulation all can find that systematic function is suitable with it, can reach the requirement of communication system; Compared to the restructural modulation mapping mode of current proposition, add the restructural demodulation modes of system, the restructural pattern of communication system is realized more complete, can Project Realization be applied to; Compared to the modulation demodulation system that common plurality of optional is selected, restructural pattern can make system improve resource utilization.
Accompanying drawing explanation
Fig. 1 is the restructural modulation flow chart of the inventive method;
Fig. 2 is the restructural demodulation flow chart of the inventive method;
Fig. 3 be in the inventive method each modulation demodulation system under Gaussian channel with the error bit ability comparison diagram of theoretical value;
Fig. 4 be in the inventive method each modulation demodulation system frequency modulation deposit in case with the error bit ability comparison diagram not adding frequency offset processing.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
Restructural modulation /demodulation module in the present embodiment adopts the modular unit of following basic granules:
Restructural stores arithmetic element, and stored the information needed by random access memory (RAM), input information obtains Output rusults in the mode of look-up table and exports.When the instruction of processor changes, need restructural storage arithmetic element to complete other calculation function, the information of RAM storage can be reconfigured to reach the demand of New function.
Restructural multiply-add operation unit, based on Booth encryption algorithm, realize the elementary cell of the multiplier of the data of two 8bit bandwidth, and in the mode of Wallace Tree pattern, the result of booth multiplier elementary cell is added up, realize taking advantage of the result added.Can the most basic multiply-add operation be realized by Wallace Tree pattern:
y
out＝a*b+c*d
Maximum multiplication in baseband modulation and demodulation algorithm and add operation all can realize with restructural multiply-add operation unit.
Restructural accumulating operation unit, in modulation-demodulation circuit, different modulation signals is obtained by phase modulation information, usually iterative algorithm will be used to obtaining phase information, in algorithm except will using two kinds of above-mentioned arithmetic elements of the present invention, also need the feedback information using superposition, therefore the present invention adopts restructural accumulating operation unit.
Serioparallel exchange unit, for MSK and QDPSK two kinds of patterns, the serial data data on Yao Jiang mono-tunnel are converted to two-way information, so adopt the serioparallel exchange unit shared.
Differential coding unit, MSK, QDPSK and BPSK Three models, need to carry out differential coding to data message, so that comparatively easy in the realization that demodulating algorithm is unified, and select differential coding unit, but need to realize two kinds of differential coding mode, wherein MSK and BPSK is single channel difference, and coding rule is
qDPSK coding rule is corresponding two-way code element a
kb
kwhen being respectively " 00 ", " 01 ", " 11 ", " 10 ", phase angle conversion Δ θ is respectively " 3/4 π ", " 1/4 π ", "-3/4 π ", "-1/4 π ".
The detailed process that modulation /demodulation realizes is as follows:
(1) the compatible modulator approach of reconfigurable modem is determined, comprise the most frequently used FSK, MSK, 2PSK and QPSK, pre-set some parameters of processor, comprising: the parameter configuration of transmission code rate, modulation demodulation system, frequency modulation, filter.
(2) modular unit of above-mentioned basic granules is determined, complete the computing that reconfigurable circuit realizes, preset the data processing method of four modulation systems in modulated process and the data processing method in corresponding demodulating process, data processing method sends to the processor of transmitter end or receiver end by instruction type, as depicted in figs. 1 and 2, with SPI Serial Peripheral Interface (SPI), instruction is sent to processor in the present embodiment, for realizing corresponding function according to data processing method scheduling reconfigurable module unit in follow-up modulation, demodulation.
(3) adjust the implementation algorithm of several modulation-demo-demodulation method, make the saving resource of realizing circuit maximum possible.Wherein FSK and MSK realizes demodulation by phase angle difference.Therefore 2PSK and QPSK adopts 2DPSK and QDPDK modulation system, before modulation first by carrying out different difference processing to data, carrys out restoring data when demodulation by the difference of the code-element period in phase angle.
(4) described above, the pool of instructions obtained by SPI is represented in modulated process and indicates the data processing method of Transmitter processor, according to the restructural modulation flow process of Fig. 1, first transmitter terminal passes through the result of processor instruction decoding to the serial data data a of processor
kcarry out data prediction.
Wherein, only carry out over-sampling through high frequency clock obtains new sequence b to FSK modulation mode data
k-fsk; 2DPSK adopts single channel difference, and coding rule is
data sequence b is obtained through differential coding unit
k-2dpsk; MSK adopts single channel difference, and coding rule is
first through differential coding unit, enter serioparallel exchange unit afterwards, over-sampling obtains two paths of data sequence q
k-mskand p
k-msk; QDPSK first obtains two paths of data sequence a through serioparallel exchange unit
k-qdpskand b
k-qdpsk, the coded system adopting International Telecommunication Union's telecommunication standardsization tissue (ITU-T) to advise afterwards carries out differential coding, and its coding rule is corresponding two-way input signal code element a
kb
kwith the last period symbols c of output signal
kd
kwhen being respectively " 00 ", " 01 ", " 11 ", " 10 ", corresponding phase angle θ is respectively " 1/2 π ", " 0 ", " 3/2 π ", " π " two phase angle sums are the phase angle that current period output symbol is corresponding, thus obtain current period output symbol c
kd
k, finally obtain c
k-qdpskand d
k-qdpsk, so far, data processing achieves data prediction by translation instruction to each modulation system.
(5) respectively through pretreated data sequence, phase angle computing is carried out to various modulation system and realize waveform shaping, generate the final I/Q two paths of signals exported, I/Q two paths of signals is carried out digital-to-analogue conversion, finally carries out modulation signal transmitting.
Wherein, fsk signal realizes cordic algorithm by restructural multiply-add operation unit and restructural accumulating operation unit, produces I road signal cos [2 π f
dt+ θ (t)] and Q road signal sin [2 π f
dt+ θ (t)], in formula, f
dfor intermediate frequency, be now zero intermediate frequency signals f
d=0,
mSK, 2DPSK and QDPSK modulation system stores arithmetic element through restructural and realizes half-wave shaping, by the analysis of counting to over-sampling, restructural is stored the sine of 2 times and cosine signal that arithmetic element internal RAM stores the transmission code rate cycle, utilize the data sequence after each modulation system preliminary treatment, and obtaining I/Q two paths of signals by the mode of look-up table, the I road signal that MSK obtains is
q road signal is
two paths of signals subtracts each other and can obtain msk signal; The I road signal that 2DPSK obtains is cos (w
0t+ θ
k), Q road signal is sin (w
0t+ θ
k); The I road signal of QDPSK is c
k-qdpskcos (w
0t), Q road signal is d
k-qdpsksin (w
0t), wherein,
θ
k=-π/4 ± pi/2, T
sfor the transmission data cycle.
(6) described above, the pool of instructions that SPI sends represents in demodulating process and indicates the data processing method of receiver processor, according to the restructural demodulation flow process of Fig. 2, receiver carries out Signal reception, and analogue data is respectively through the signal of the I/Q two-way band intermediate frequency that analog-to-digital conversion obtains
with
first utilized and declinate formula filtering intermediate-freuqncy signal by lower mixting circuit, system is played to the effect of filtering Image interference simultaneously, be specially: the cordic algorithm circuit that first this circuit utilizes the restructural multiply-add operation unit identical with transmitter and restructural accumulating operation unit to realize, produce intermediate-freuqncy signal cos (w
ct), sin (w
ct), then by restructural multiply-add operation unit, the calculating of realization and declinate formula, the intermediate frequency component w in filtering original I/Q two paths of signals
cthe high-frequency signal that signal afterwards may exist through low pass filter filtering Image interference, wherein, low pass filter adopts finite impulse response filter FIR, utilize restructural to store arithmetic element memory filter coefficient, realize standard FIR filter by multiple restructural multiply-add operation unit
coefficient and the calculating process of signal, the I/Q two paths of signals of each modulation system transmitter original transmitted finally obtained, the I/Q two paths of signals of FSK modulation mode is cos [θ (t)] and sin [θ (t)]; The I/Q two paths of signals of MSK modulation system is
with
the I/Q two paths of signals of 2DPSK is cos (w
0t+ θ
k) and sin (w
0t+ θ
k), wherein
θ
k=-π/4 ± pi/2, T
sfor the transmission data cycle; The I road signal of QDPSK is c
k-qdpskcos (w
0t), Q road signal is d
k-qdpsksin (w
0t).Now, the I/Q two paths of signals of FSK and MSK is zero intermediate frequency signals, the I/Q two paths of signals of 2DPSK and QDPSK is the signal of the band fundamental frequency relevant to code check and initial phase, demodulation is realized by initial phase difference, 2DPSK and QDPSK first will remove the circuit of fundamental frequency by one, obtain only relevant to an initial phase I/Q two paths of signals, store arithmetic element specifically by utilizing restructural and produce this fundamental frequency signal cos (w in the mode of LUT
0t) with sin (w
0t), then pass through and difference formula removal fundamental frequency, obtain the value cos (θ of the sine and cosine of starting phase angle
k) and cos (θ
k), wherein, for 2DPSK modulation system, θ
k=-π/4 ± pi/2, for QDPSK modulation system, θ
k=± π/4, ± 3 π/4.
(7) due to the phase error that synchronously will not produce a Δ θ of initial phase, so afterwards also by this error of mode filtering by asking phase difference.The I/Q two paths of signals obtained in step (6) stores arithmetic element by restructural, utilize the phase angle information that RAM stores, input value according to I/Q two paths of signals obtains in the mode of look-up table the phase angle information exporting sampled point, ask poor mode to filter a Δ θ of intermediate-freuqncy signal generation by phase angle again, utilize different difference intervals and decay time to realize asking poor to the phase angle of different modulating mode.
MSK and FSK due to signal frequency when signal transmission " 1 " be on the occasion of, therefore sampled point phase angle is in continuous increase, and time signal transmission " 0 ", frequency is negative value, and sampled point phase angle, in continuous reduction, can judge signal transmission by the positive and negative values of phase difference; 2DPSK is due to differential coding, and utilize the phase difference of initial phase to realize demodulation judgement, phase difference changes this and thinks signal transmission " 1 ", constant, thinks signal transmission " 0 "; Equally, QPDSK due to differential coding rule, the absolute value of phase angle difference result have four kinds may, can by two code elements transmitted with threshold value multilevel iudge.The time of delay of phase difference, MSK and FSK is determined by over-sampling rate, and 2DPSK postpones a signal period, and QDPSK postpones two signal periods, determines the threshold value that demodulation is adjudicated: FSK and MSK is adjudicated by positive and negative values according to above-mentioned analysis, and therefore threshold value is " 0 "; 2DPSK phase difference absolute value is respectively " 0 " and " π ", and therefore threshold value is pi/2; QDPSK has 3 threshold values, is 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 provides, and changes the deploy content of system and the relation of interconnection line thus realize different modulation systems and transmission code rate by configuration serial peripheral equipment interface SPI instruction.
What the demodulation modes due to MSK adopted is coherent differential demodulation, identical with the theoretical scheme of FSK demodulation, is only that modulation system and frequency modulation are variant, so theoretic bit error rate is all mutually: 1/2exp (-r/4), wherein r is signal to noise ratio.In like manner, 2DPSK and QDPSK theoretical bit error rate of returning is 1/2exp (-r/2).When transmission rate is 300kbps, by simulation analysis with relatively can find: in Fig. 3, the performance of restructural modulation demodulation system is close to theoretical value, under the requirement of the bit error rate of short-distance wireless communication 1%, MSK and FSK is respectively in the performance loss of 11.3dB and 11.6dB with nearly 0.3dB and 0.6dB of theoretical value, 2DPSK and QDPSK, roughly at about 8.7dB, has the performance loss of about 0.9dB with theoretical value.Visible, the increase of bit error rate is roughly facilitated by reasons such as the quantization error of system and the brachymemmas of algorithm calculation process process, can reach the bit error rate requirement of short distance radio communication system completely.
Be 300kbps in transmission rate, when frequency shift (FS) is 20kbps, emulation obtains Fig. 4, can be found: under the frequency modulation of 20kbps, systematic function roughly loses 0.5dB by contrast, under can reaching the signal to noise ratio of 12dB, worst case is below the error rate of 1%.
Claims (8)
1. be applied to the restructural modulation-demo-demodulation method in Base-Band Processing, it is characterized in that, the method comprises the following steps:
(1) transmitter carries out Instruction decoding to the instruction that processor obtains, and according to the parameter determination modulation system pre-set in processor and corresponding modulation parameter, described in the parameter that pre-sets comprise the parameter configuration of transmission code rate, modulation demodulation system, frequency modulation, filter;
(2) utilize restructural modulation module according to the serial data data a of determined modulation system to processor
kcarry out data processing and obtain I/Q two-way fundamental frequency signal, described data processing comprises data prediction and waveform shaping;
(3) described I/Q two paths of signals is sent to the loading that analog-to-digital conversion device carries out the signal of telecommunication obtain modulation signal and launch;
(4) receiver carries out Signal reception, and analogue data obtains the signal of I/Q two-way band intermediate frequency through analog-to-digital conversion, according to the corresponding demodulation mode prestored in the modulation system of the result determination Received signal strength of receiver side processor instruction decoding and the machine;
(5) utilize the target signal filter interfere information of restructural demodulation module to described band intermediate frequency to restore the original I/Q two-way fundamental frequency signal of baseband processor, utilize the phase error in the mode filtering I/Q two-way fundamental frequency signal of phase difference;
(6) adopt the difference interval and different threshold value that pre-set to carry out the judgement of demodulation to different modulating mode, finally realize the demodulation to whole data flow.
2. the restructural modulation-demo-demodulation method be applied in Base-Band Processing according to claim 1, is characterized in that, the compatible four kinds of modulation systems of the method, are respectively FSK, MSK, 2DPSK, QDPSK.
3. the restructural modulation-demo-demodulation method be applied in Base-Band Processing according to claim 2, is characterized in that, the restructural modulation module in described step (2) comprises following modular unit:
Restructural stores arithmetic element, obtains Output rusults for the information that stores according to RAM memory and input information in the mode of tabling look-up, or reconfigures according to the instruction of processor the information that RAM memory stores and complete corresponding calculation function;
Restructural multiply-add operation unit, for realizing the multiplication function of complement code based on Booth encryption algorithm, and takes advantage of add function with the realization of the result of booth multiplier elementary cell being added up of Wallace Tree pattern;
Restructural accumulating operation unit, carries out superposition calculation for utilizing in modulated process during phase information modulation signal;
Serioparallel exchange unit, for being converted to two-way information by the serial data data on a road;
Differential coding unit, for carrying out differential coding to data message.
4. the restructural modulation-demo-demodulation method be applied in Base-Band Processing according to claim 3, it is characterized in that, the data prediction mode that modulation systems different in step (2) is corresponding different is as follows respectively: the data prediction mode corresponding to FSK modulation mode is by the serial data data a of described processor
kcarry out over-sampling through high frequency clock and obtain data sequence b
k-fsk; Data prediction mode corresponding to 2DPSK modulation system is by the serial data data a of described processor
kdata sequence b is obtained through differential coding unit
k-2dpsk; Data prediction mode corresponding to MSK modulation system is first by the serial data data a of described processor
kthrough differential coding unit, enter serioparallel exchange unit afterwards, over-sampling obtains two paths of data sequence q
k-mskand p
k-msk; Data prediction mode corresponding to QDPSK modulation system is first by the serial data data a of described processor
ktwo paths of data sequence a is obtained through serioparallel exchange unit
k-qdpskand b
k-qdpsk, then obtain data sequence c through differential coding unit
k-qdpskand d
k-qdpsk.
5. the restructural modulation-demo-demodulation method be applied in Base-Band Processing according to claim 4, it is characterized in that, the waveform shaping mode that modulation systems different in step (2) is corresponding different, each modulation system generates I/Q two paths of signals by waveform shaping, as follows respectively: for FSK modulation mode, by sequence b
k-fskutilize the phase angle information of frequency change to adopt cordic algorithm by restructural multiply-add operation unit and restructural accumulating operation unit, produce I/Q two paths of signals; For MSK, 2DPSK and QDPSK modulation system, store arithmetic element through restructural and realize half-wave shaping, by the analysis of counting to over-sampling, storing the arithmetic element internal RAM memory cycle to restructural is the transmission code rate cycle sine of 2 times and cosine signal, according to the data sequence obtained after respective data prediction, obtain I/Q two paths of signals by the mode of look-up table.
6. the restructural modulation-demo-demodulation method be applied in Base-Band Processing according to claim 2, is characterized in that, the restructural demodulation module in described step (5) comprises following modular unit:
Restructural stores arithmetic element, obtains Output rusults for the information that stores according to RAM memory and input information in the mode of tabling look-up, or reconfigures according to the instruction of processor the information that RAM memory stores and complete corresponding calculation function;
Restructural multiply-add operation unit, for realizing the multiplication function of complement code based on Booth encryption algorithm, and takes advantage of add function with the realization of the result of booth multiplier elementary cell being added up of Wallace Tree pattern;
Restructural accumulating operation unit, carries out superposition calculation for utilizing in demodulating process when phase information and feedback information restituted signal.
7. the restructural modulation-demo-demodulation method be applied in Base-Band Processing according to claim 6, is characterized in that, the I/Q two-way fundamental frequency signal that in step (5), the described baseband processor of reduction is original, comprises the following steps:
The cordic algorithm circuit utilizing the restructural multiply-add operation unit identical with transmitter side and restructural accumulating operation unit to realize produces intermediate-freuqncy signal cos (w
ct), sin (w
ct), then by restructural multiply-add operation unit, the calculating of realization and declinate formula, the intermediate frequency component w in filtering original I/Q two paths of signals
c, and by gained signal through low pass filter;
For FSK, MSK modulation system, obtain the I/Q two paths of signals of transmitter original transmitted through above-mentioned steps; For 2DPSK and QDPSK modulation system, also need utilize restructural to store arithmetic element and remove with difference formula the I/Q two paths of signals that fundamental frequency just can obtain transmitter original transmitted.
8. the restructural modulation-demo-demodulation method be applied in Base-Band Processing according to claim 7, it is characterized in that, in step (6), the threshold value of each modulation system is as follows respectively: the threshold value of FSK and MSK is 0,2DPSK threshold value is pi/2, QDPSK has 3 threshold values, is respectively π/4,3 π/4,5 π/4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510061216.3A CN104618303B (en) | 2015-02-05 | 2015-02-05 | A kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing |
| PCT/CN2016/073139 WO2016124128A1 (en) | 2015-02-05 | 2016-02-02 | Reconfigurable modulation and demodulation method used in baseband processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510061216.3A CN104618303B (en) | 2015-02-05 | 2015-02-05 | A kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104618303A true CN104618303A (en) | 2015-05-13 |
| CN104618303B CN104618303B (en) | 2017-11-03 |
Family
ID=53152586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510061216.3A Active CN104618303B (en) | 2015-02-05 | 2015-02-05 | A kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104618303B (en) |
| WO (1) | WO2016124128A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016124128A1 (en) * | 2015-02-05 | 2016-08-11 | 东南大学 | Reconfigurable modulation and demodulation method used in baseband processing |
| CN106155814A (en) * | 2016-07-04 | 2016-11-23 | 合肥工业大学 | A kind of reconfigurable arithmetic unit supporting multiple-working mode and working method thereof |
| CN107317603A (en) * | 2017-07-03 | 2017-11-03 | 河南省科学院应用物理研究所有限公司 | A kind of method of power line communication, system and power line communications terminal |
| CN108243131A (en) * | 2018-01-10 | 2018-07-03 | 四川阵风科技有限公司 | Demodulation method, device, spectrum detector and computer read/write memory medium |
| CN108243130A (en) * | 2018-01-10 | 2018-07-03 | 四川阵风科技有限公司 | Demodulation method, device, spectrum detector and computer readable storage medium |
| CN113922860A (en) * | 2021-09-14 | 2022-01-11 | 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 |
| CN114553646A (en) * | 2022-01-09 | 2022-05-27 | 苏州大学 | Reconfigurable modulation-demodulation system based on WBAN (white blood cell network) narrowband physical layer |
| CN114915527A (en) * | 2022-04-26 | 2022-08-16 | 大尧信息科技(湖南)有限公司 | Hybrid modulation signal synthesis method based on software reconfiguration and generator |
| CN115022421A (en) * | 2022-05-30 | 2022-09-06 | 西安微电子技术研究所 | Wired signal transmission circuit |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113794562A (en) * | 2021-09-27 | 2021-12-14 | 南京宁麒智能计算芯片研究院有限公司 | Bilinear pairing calculation acceleration system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050190827A1 (en) * | 2004-02-26 | 2005-09-01 | Xu Chang Q. | Modulation/demodulation apparatus for the encoding and decoding of data and method for encoding and decoding data |
| CN101399556A (en) * | 2008-11-10 | 2009-04-01 | 清华大学 | Dynamically configuring, adaptive, and policy driving reflection software management method |
| US8223890B1 (en) * | 2009-10-30 | 2012-07-17 | The United States Of America As Represented By The Secretary Of The Army | Asymptotically optimal modulation classification method for software defined radios |
| CN103294635A (en) * | 2013-04-03 | 2013-09-11 | 中国电子科技集团公司第七研究所 | Modem component processing core and integrated circuit based on software communication architecture (SCA) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8629716B2 (en) * | 2008-09-19 | 2014-01-14 | Agency For Science, Technology And Research | Modulator, demodulator and modulator-demodulator |
| CN101945064B (en) * | 2010-08-19 | 2013-05-08 | 电子科技大学 | Iterative multi-tone jamming resistant communication method based on energy spreading |
| CN102685467A (en) * | 2012-04-27 | 2012-09-19 | 中国科学院空间科学与应用研究中心 | Wireless image transmission communication system for unmanned aerial vehicle and wireless image transmission communication method |
| CN103067330B (en) * | 2012-12-14 | 2015-05-20 | 北京大学 | Communication method for dynamic reconfigurable under water acoustics modulator-demodulator |
| CN104618303B (en) * | 2015-02-05 | 2017-11-03 | 东南大学 | A kind of restructural modulation-demo-demodulation method being applied in Base-Band Processing |
-
2015
- 2015-02-05 CN CN201510061216.3A patent/CN104618303B/en active Active
-
2016
- 2016-02-02 WO PCT/CN2016/073139 patent/WO2016124128A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050190827A1 (en) * | 2004-02-26 | 2005-09-01 | Xu Chang Q. | Modulation/demodulation apparatus for the encoding and decoding of data and method for encoding and decoding data |
| CN101399556A (en) * | 2008-11-10 | 2009-04-01 | 清华大学 | Dynamically configuring, adaptive, and policy driving reflection software management method |
| US8223890B1 (en) * | 2009-10-30 | 2012-07-17 | The United States Of America As Represented By The Secretary Of The Army | Asymptotically optimal modulation classification method for software defined radios |
| CN103294635A (en) * | 2013-04-03 | 2013-09-11 | 中国电子科技集团公司第七研究所 | Modem component processing core and integrated circuit based on software communication architecture (SCA) |
Non-Patent Citations (1)
| Title |
|---|
| 谢作全: "认知无线电系统中自适应调制解调器的研究与实现", 《信息科技辑》 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016124128A1 (en) * | 2015-02-05 | 2016-08-11 | 东南大学 | Reconfigurable modulation and demodulation method used in baseband processing |
| 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 |
| CN106155814A (en) * | 2016-07-04 | 2016-11-23 | 合肥工业大学 | A kind of reconfigurable arithmetic unit supporting multiple-working mode and working method thereof |
| CN107317603A (en) * | 2017-07-03 | 2017-11-03 | 河南省科学院应用物理研究所有限公司 | A kind of method of power line communication, system and power line communications terminal |
| 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 |
| CN108243130A (en) * | 2018-01-10 | 2018-07-03 | 四川阵风科技有限公司 | Demodulation method, device, spectrum detector and computer readable storage medium |
| 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 |
| CN108243131A (en) * | 2018-01-10 | 2018-07-03 | 四川阵风科技有限公司 | Demodulation method, device, spectrum detector and computer read/write memory medium |
| CN113922860A (en) * | 2021-09-14 | 2022-01-11 | 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 |
| CN114553646A (en) * | 2022-01-09 | 2022-05-27 | 苏州大学 | Reconfigurable modulation-demodulation system based on WBAN (white blood cell network) narrowband physical layer |
| 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 |
| CN114915527A (en) * | 2022-04-26 | 2022-08-16 | 大尧信息科技(湖南)有限公司 | Hybrid modulation signal synthesis method based on software reconfiguration and generator |
| CN114915527B (en) * | 2022-04-26 | 2023-05-12 | 大尧信息科技(湖南)有限公司 | Mixed modulation signal synthesis method and generator based on software reconfiguration |
| CN115022421A (en) * | 2022-05-30 | 2022-09-06 | 西安微电子技术研究所 | Wired signal transmission circuit |
| CN115022421B (en) * | 2022-05-30 | 2023-06-27 | 西安微电子技术研究所 | Wired signal transmission circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104618303B (en) | 2017-11-03 |
| WO2016124128A1 (en) | 2016-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104618303A (en) | Reconfigurable modulation and demodulation method applied to baseband processing | |
| US11665710B2 (en) | Wireless devices and systems including examples of configuration modes for baseband units and remote radio heads | |
| CN101945490A (en) | Software radio-based wireless communication system terminal equipment | |
| CN106464618A (en) | Low PAPR modulation for coverage enhancement | |
| CN105553486A (en) | Software radio design method on the basis of SCA configuration and integrated service processing platform on the basis of SCA configuration | |
| CN111954280A (en) | Broadband carrier and wireless dual-mode communication switching method, system and device | |
| CN106209310A (en) | A kind of variable symbol rate modem devices and implementation method | |
| CN103209151A (en) | General constellation demodulation method and system | |
| US9780729B2 (en) | Signal frequency conversion circuit and signal frequency conversion method | |
| CN108023680A (en) | Low speed variable bit rate multi-mode encoding modulator based on VTDM frame structures | |
| CN103795456A (en) | Maritime satellite communication signal receiving system and method | |
| CN103905370A (en) | Soft demodulation method and device for quadrature amplitude modulation (QAM) signal and mobile terminal | |
| CN116015322A (en) | Multi-system airborne telemetry transmitting system and method | |
| CN102946370B (en) | FPGA (field programmable gate array)-based method for realizing FM (frequency modulation) and demodulating digital logic circuit | |
| CN103138776B (en) | A kind of Zigbee emitter of multi output | |
| CN111064502A (en) | High code rate data transmission terminal | |
| CN202696557U (en) | Novel digital multiple continuous phase frequency shift keying (MCPFSK) signal generator | |
| CN103199890B (en) | A kind of Ethernet radio network gateway based on many output ZigBee technology | |
| CN203014854U (en) | Offset quadrature phase shift keying signal transmitter | |
| CN204180060U (en) | A kind of ground-to-air wideband communication system for unmanned plane | |
| CN103828243A (en) | Base-band to radio frequency up-converter | |
| US9276788B2 (en) | Joint demodulating and demapping of digital signal | |
| Luo et al. | A maritime radio communication system based on GNU Radio_HackRF platform and GMSK modulation | |
| US8699630B2 (en) | Systems and methods for handling data rate changes within a packet or frame | |
| CN205545298U (en) | Based on directly adjudicating carrier wave phase synchronization structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |