CN107425918A - A kind of modulation based on QAM, demodulation method and device - Google Patents
A kind of modulation based on QAM, demodulation method and device Download PDFInfo
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- CN107425918A CN107425918A CN201610342873.XA CN201610342873A CN107425918A CN 107425918 A CN107425918 A CN 107425918A CN 201610342873 A CN201610342873 A CN 201610342873A CN 107425918 A CN107425918 A CN 107425918A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/612—Coherent receivers for optical signals modulated with a format different from binary or higher-order PSK [X-PSK], e.g. QAM, DPSK, FSK, MSK, ASK
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Abstract
The present invention discloses a kind of modulation based on QAM, demodulation method and device, and this method includes：Data signal to be sent all the way is subjected to serioparallel exchange and obtains 2N roads data signal to be modulated, N is the positive integer more than 1；The related road-load ripples of 2N of N number of carrier frequency are generated according to default N number of carrier frequency respectively, wherein, the mutually orthogonal carrier wave of each carrier frequency generation two-way；By 2N roads data signal to be modulated respectively with 2N roads carrier multiplication, the analog signal after the modulation of 2N roads is obtained；Exported after analog signal after the modulation of 2N roads is carried out into linear superposition by antenna, to solve the problems, such as requirement that the modulation rate of existing digital modulation and demodulation mode is unable to reach 5G communication systems.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of modulation based on QAM, demodulation method and device.
Background technology
Base band data modulation-demodulation technique is a highly important technology in digital communication, directly behind decision
Channel data transmits the height of speed.Digital modulation and demodulation mode applied to the communications field has many, such as width
Move keying (ASK), frequency shift keying (FSK), the one-dimensional free degree modulation system such as phase-shift keying (PSK) (PSK) and
The two-dimensional freedom modulation methods such as quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM)
Formula.
Wherein, the high-order modulating that QAM is a kind of amplitude and phase is combined, it has higher frequency band
Utilization rate and preferable power utilization.So-called quadrature amplitude modulation, it is exactly with two independent baseband waveforms
The same frequency carrier wave mutually orthogonal to two carries out suppressed-carrier double side band modulation, so as to utilize this own modulation
The orthogonality of signal frequency spectrum in same bandwidth realizes the parallel digital information transmission of two-way.
Because QAM is the orthogonal amplitude degree modulation technique based on two-dimensional modulation variable, adjustment speed is one-dimensional tune
Twice of mode processed, but modulation accuracy still depends on amplitude shift exponent number.Such as：Wireless channel inferior quality,
The most high-order for applying the baseband modulation and demodulation technology in 4G LTE systems is 64QAM；Wire message way quality
Preferably, the most high-order applied in high definition cable television system baseband modulation and demodulation technology have 256QAM and
512QAM.At present, the high order modulation-demodulation device in is all two-dimensional modulation demodulation techniques, and most high-order is
1024QAM.But with the continuous development of 5G communication systems in the communication technology, current digital modulation solution
The modulation rate of tune mode is unable to reach the requirement of 5G communication systems, so, need a kind of digital modulation and demodulation badly
Mode can improve modulation rate while modulation /demodulation effect is ensured.
The content of the invention
The embodiment of the present invention provides a kind of modulation based on QAM, demodulation method and device, existing to solve
The modulation rate of digital modulation and demodulation mode the problem of being unable to reach the requirement of 5G communication systems.
The inventive method includes a kind of modulator approach based on QAM, and this method includes：Will be to be sent all the way
Data signal carries out serioparallel exchange and obtains 2N roads data signal to be modulated, and N is the positive integer more than 1；
The related road-load ripples of 2N of N number of carrier frequency are generated according to default N number of carrier frequency respectively,
Wherein, the mutually orthogonal carrier wave of each carrier frequency generation two-way；
By 2N roads data signal to be modulated respectively with 2N roads carrier multiplication, 2N roads tune is obtained
Analog signal after system；Analog signal after 2N roads are modulated is exported after carrying out linear superposition by antenna.
Corresponding with modulator approach, the embodiment of the present invention provides a kind of demodulation method based on QAM, this method
Including：The analog signal that antenna is received with 2N roads carrier multiplication, obtains the numeral after the demodulation of 2N roads respectively
Signal, wherein, the analog signal is that have passed through the signal after the carrier modulation of the 2N roads, the N roads
Carrier wave is to generate the mutually orthogonal carrier wave of two-way, N according to the generation of default carrier frequency and each carrier frequency
For the positive integer more than 1；
Data signal after 2N roads are demodulated carries out the data signal after parallel-serial conversion is demodulated all the way.
Based on same inventive concept, the embodiment of the present invention further provides a kind of modulation dress based on QAM
Put, the device includes：Serioparallel exchange unit, for data signal to be sent all the way to be carried out into serioparallel exchange
2N roads data signal to be modulated is obtained, N is the positive integer more than 1；
Carrier generation unit, for generating N number of carrier frequency respectively according to default N number of carrier frequency
The related road-load ripples of 2N, wherein, the mutually orthogonal carrier wave of each carrier frequency generation two-way；
Modulating unit, for by 2N roads data signal to be modulated respectively with 2N roads carrier multiplication,
Obtain the analog signal after the modulation of 2N roads；
Linear superposition unit, for defeated by antenna after the analog signal progress linear superposition after 2N roads are modulated
Go out.
Corresponding with demodulating equipment, the embodiment of the present invention further provides a kind of demodulation dress based on QAM
Put, the device includes：Demodulating unit, for the analog signal that receives antenna respectively with 2N roads carrier multiplication,
The data signal after the demodulation of 2N roads is obtained, wherein, the analog signal is adjusted to have passed through the road-load ripples of the 2N
Signal after system, the road-load ripples of N are generated according to the generation of default carrier frequency and each carrier frequency
The mutually orthogonal carrier wave of two-way, N are the positive integer more than 1；
Parallel serial conversion unit, carry out parallel-serial conversion for the data signal after 2N roads are demodulated and demodulated all the way
Data signal afterwards.
The embodiment of the present invention on the basis of original QAM, is further added by based on current ripe QAM technologies
One or more than one carrier frequency, each carrier frequency correspondingly generate the mutually orthogonal carrier wave of two-way,
By 2N roads data signal to be modulated respectively with 2N roads carrier multiplication, obtain 2N roads modulation after
Analog signal, then by demodulation method, analog signal is demodulated into data signal using same carrier wave,
That is it is equal to and realizes two QAM or two or more QAM simultaneously, so that traditional two-dimensional quadrature width
Degree modulation technique is changed into four-dimensional or sextuple quadrature amplitude modulation and demodulation method, is ensureing modulation /demodulation
While effect, higher modulation rate is realized, so as to meet the requirement of 5G communication systems.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, institute in being described below to embodiment
The accompanying drawing needed to use is briefly introduced, it should be apparent that, drawings in the following description are only the present invention's
Some embodiments, for one of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 provides a kind of modulator approach schematic flow sheet based on QAM for the embodiment of the present invention；
Fig. 2 provides the modulation principle schematic diagram one of DFQAM a kind of for the embodiment of the present invention；
Fig. 3 provides the modulation principle schematic diagram two of DFQAM a kind of for the embodiment of the present invention；
Fig. 4 provides the modulation principle schematic diagram one of TFQAM a kind of for the embodiment of the present invention；
Fig. 5 provides the modulation principle schematic diagram two of TFQAM a kind of for the embodiment of the present invention；
Fig. 6 a~Fig. 6 c are 16DFQAM, 256DFQAM and 4096DFQAM provided in an embodiment of the present invention
Ber curve；
Fig. 7~Figure 11 is TFQAM provided in an embodiment of the present invention ber curve；
Figure 12 is the signal spectrogram in 256DFQAM transmitting terminals modulated process provided in an embodiment of the present invention；
Figure 13 is the signal spectrum during 256DFQAM receiving terminals demodulation process provided in an embodiment of the present invention
Figure；
Figure 14 for it is provided in an embodiment of the present invention with analog simulation and theoretical formula to 16DFQAM,
The ber curve that 256DFQAM and 4096DFQAM is obtained after calculating；
Figure 15 is the different modulating exponent numbers of QAM provided in an embodiment of the present invention and DFQAM from low to high
The ber curve of digital modulation and demodulation mode；
Figure 16 is the signal spectrogram in 4096TFQAM transmitting terminals modulated process provided in an embodiment of the present invention；
Figure 17 is the signal spectrum during 4096TFQAM receiving terminals demodulation process provided in an embodiment of the present invention
Figure；
Figure 18 is 16DFQAM, 256DFQAM and 4096DFQAM provided in an embodiment of the present invention mistake
Code check；
Figure 19 is tri- kinds of modulation methods of 16QAM, 64QAM and 4096TFQAM provided in an embodiment of the present invention
The ber curve figure of formula；
Figure 20 provides a kind of demodulation method schematic flow sheet based on QAM for the embodiment of the present invention；
Figure 21 is that the embodiment of the present invention also provides a kind of modulating device based on QAM；
Figure 22 embodiment of the present invention also provides a kind of demodulating equipment based on QAM.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing to this hair
It is bright to be described in further detail, it is clear that described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out under the premise of creative work all other embodiment obtained, belong to the scope of protection of the invention.
Shown in Figure 1, the embodiment of the present invention provides a kind of modulator approach schematic flow sheet based on QAM,
Specifically implementation method includes：
Step S101, data signal to be sent all the way is subjected to serioparallel exchange and obtains 2N roads number to be modulated
Word signal, N are the positive integer more than 1.
Step S102, N number of carrier frequency correlation is generated according to default N number of carrier frequency respectively
The road-load ripples of 2N, wherein, the mutually orthogonal carrier wave of each carrier frequency generation two-way.
Step S103, by 2N roads data signal to be modulated respectively with 2N roads carrier multiplication, obtain
Analog signal after being modulated to 2N roads.
Step S104, the analog signal after 2N roads are modulated are exported after carrying out linear superposition by antenna.
Specifically, in step s 102, for first carrier frequency, generation one and first carrier frequency
The related sine wave of rate and one and the cosine wave of the first carrier frequency dependence, the first carrier frequency
For any one in default N number of carrier frequency, that is to say, that generally according to default frequency w1、
w2、w3Deng generation and w1、w2、w3Related multichannel carrier, such as cos (w1t)、sin(w1t)、cos(w2t)、
sin(w2t)、cos(w3t)、sin(w3The carrier wave such as t), wherein, cos (w1t)、sin(w1T) it is mutually orthogonal, cos (w2t)、
sin(w2T) it is mutually orthogonal, cos (w3t)、sin(w3T) it is mutually orthogonal.Then first carrier frequency is directed to,
First via data signal to be modulated is multiplied with the sine wave of the first carrier frequency dependence, obtains first
Analog signal after the modulation of road；By the second tunnel data signal to be modulated and the first carrier frequency dependence
Cosine wave is multiplied, and obtains the analog signal after the modulation of the second tunnel；First via data signal to be modulated and
Second tunnel data signal to be modulated is any two-way in the data signal to be modulated of the 2N roads.
For example when N is equal to 2, the embodiments of the invention provide the basic of modulation /demodulation as shown in Figure 2
Operation principle schematic diagram.The modulated process of transmitting terminal is binary data stream { a on the left of Fig. 2nBy going here and there and becoming
After changing, turn into four sub-data stream { a1n}、{a2n}、{a3nAnd { a4n, but with orthogonal carrier wave
cos(w1And sin (w t)1T), respectively to { b1nAnd { b2nModulation, make modulated signal { c1nAnd { c2n, then
With orthogonal carrier wave cos (w2And sin (w t)2T), respectively to { b3nAnd { b4nModulation, make modulation letter
Number { c3nAnd { c4n, last linear superposition, four tunnel modulated signals are merged into modulated signal { c all the wayn, from day
Line is sent out.Obviously, the modulated signal occupies two transmission frequencies, and each frequency supports a QAM side
Formula, for the ease of description, the embodiment of the present invention is named as four-dimensional double frequency quadrature amplitude modulation demodulator (Double
Frequency Quadrature Amplitude Modem, DFQAM).
In order that the effect that must be modulated is more preferable, the embodiment of the present invention further increases electricity after serioparallel exchange
The step of flat turn is changed, specifically, 2N roads data signal to be modulated is subjected to level conversion, had
There is the 2N roads of multiple amplitudes change data signal to be modulated.As shown in figure 3, work as binary data stream { an}
It is four road binary data stream { a through serial to parallel conversion1n}、{a2n}、{a3nAnd { a4nAfter, by four circuit-switched data streams
4 level values are distributed by 2 bits, 2-4 level translations is realized, makes new data flow { b1n}、{b2n}、
{b3nAnd { b4n, then with four carrier wave cos (w1t)、sin(w1t)、cos(w2And sin (w t)2T) the road signals of Dui Zhe tetra- are adjusted
System, certainly, in practical operation, 2-4 level translations can be replaced with the level translation of other standards, from reality
Testing analysis can be concluded that the effect bit error rate of 2-4 level translations is relatively low.
Certainly, if N is equal to 3, the method for modulation /demodulation provided in an embodiment of the present invention as shown in figure 4,
The modulated process of transmitting terminal is binary data stream { a on the left of Fig. 4nIt is divided into six way numbers after serial to parallel conversion
According to stream { a1n}、{a2n}、{a3n}、{a4n}、{a5nAnd { a6n, but with orthogonal carrier wave cos (w1t)、
sin(w1T), respectively to { b1nAnd { b2nModulation, make modulated signal { c1nAnd { c2n, use is orthogonal
Carrier wave cos (w2And sin (w t)2T), respectively to { b3nAnd { b4nModulation, make modulated signal { c3nAnd
{c4n, with orthogonal carrier wave cos (w3t)、sin(w3T), respectively to { b5nAnd { b6nModulation, make
Modulated signal { c5nAnd { c6n, last linear superposition, six tunnel modulated signals are merged into modulated signal { c all the wayn,
Sent out from antenna.Obviously, the modulated signal occupies three transmission frequencies, and each frequency supports a QAM
Mode.In fact, in these three carrier waves one be dominant frequency, two be auxiliary frequency, two auxiliary frequencies are respectively positioned at master
The symmetrical both sides of frequency.Certainly, in order that the effect that must be modulated is more preferable, the embodiment of the present invention is further being gone here and there
And after changing the step of increase level conversion, specifically, as shown in figure 5, working as binary data stream { an}
It is six road binary data stream { a through serial to parallel conversion1n}、{a2n}、{a3n}、{a4n}、{a5nAnd { a6nAfter,
Binary data is transformed into the different electric impulse signal { b of amplitude through 2-4 level translations1n}、{b2n}、{b3n}、
{b4n}、{b5nAnd { b6n, then with six carrier wave cos (w1t)、sin(w1t)、cos(w2And sin (w t)2t)、cos(w3t)
With sin (w3T) the tunnel signal modulations of Dui Zhe six, for the ease of description, the embodiment of the present invention is being named as the frequency of 6 DOF three just
Hand over Modulation and Amplitude Modulation demodulator (Three Frequency Quadrature Amplitude Modem：TFQAM).
When N is equal to 2, because two carrier wave cos (w in DFQAM1And cos (w t)2T), frequency is different,
Also it is and non-orthogonal, but each carrier wave by that can generate two mutually orthogonal subcarriers again after converting first phase
cos(w1t)、sin(w1And cos (w t)2t)、sin(w2T), so DFQAM has four subcarriers while modulation two is entered
Data processed.Subcarrier cos (w1t)、sin(w1Or cos (w t)2t)、sin(w2T) it is orthogonal each other, do not have each other in theory
Interference, but cos (w1t)、cos(w2Or sin (w t)1t)、sin(w2Or cos (w t)1t)、sin(w2It is t) between and nonopiate,
Simply frequency is different, exists interfere in theory, so when DFQAM works, double frequency interference is one
Major issue, although the gap between double frequency frequency is bigger, the interference of this double frequency is smaller, during real work not
The gap of double frequency frequency may infinitely be expanded.In addition, DFQAM modems also with channel SNRs phase
Close, the more big then modulating performance of signal to noise ratio is better, so analysis double frequency frequency distance and signal to noise ratio are to system interference
Relation, help to obtain high-quality DFQAM modems.
It is as shown in Figure 6 a 16DFQAM, 256DFQAM and 4096DFQAM, in first carrier
F1=10Hz, second carrier wave f2 gradually change caused ber curve from 5Hz to 15Hz.In emulation
Take random binary data 2.4 ten thousand, sampling frequency 90, signal to noise ratio 5.As can be seen that three kinds of modulation systems
The bit error rate and the second carrier frequency into periodic swinging relation, the cycle is about 1.5Hz, and changing rule is not
Change with the change of signal to noise ratio (see Fig. 6 b).16DFQAM illustrate only main peak because the bit error rate is too small in figure,
Other then show 3 symmetrical submaximums.The wide about 2Hz of main peak, the second carrier wave must outside this main peak width,
That is, one of carrier frequency is dominant frequency in default N number of carrier frequency, remaining carrier frequency
Value outside the peak width of dominant frequency.The curve location of three kinds of modulation systems, reflect in 5dB signal to noise ratio
Bit error rate level.When the second carrier frequency f2 changes with first carrier frequency f1, DFQAM error code
Rate is changed by rectilinear oscillation decaying exponential curve, is finally tended towards stability.The frequency of carrier wave in addition to dominant frequency
Optimal value at be all troughs, as shown in Figure 6 a, the bit error rate is minimum during f2=13, is optimal data point
One of.
Fig. 6 b show 256DFQAM the second carrier frequency from 5Hz to 15Hz, signal to noise ratio is from -5dB
Bit error rate curved surface when being gradually changed to 5dB.As can be seen that the second carrier frequency axle is periodic swinging song
Line, signal to noise ratio axle are error function attenuation curves.When signal to noise ratio is -5dB, the 256DFQAM bit error rate
With the second carrier frequency variation close to straight line.When signal to noise ratio is 5dB, the 256DFQAM bit error rate is with
Nd carrier frequency amplitude of variation is very big.The curve gauge of the second carrier frequency variation relative with the bit error rate shown in Fig. 6 a
Rule is the same, does not have change greatly when signal to noise ratio changes, change is simply as signal to noise ratio is less and less this
Periodic swinging changes more and more gentler, and as signal to noise ratio is increasing, main peak is held essentially constant, secondary
Peak gradually tends to the minimum bit-error rate of system and becomes and be in line, as long as so signal to noise ratio is sufficiently large, the second carrier wave
Except inadvisable in main peak width, others are just as frequency.Illustrate, when selecting the second carrier frequency,
And without the concern for the signal to noise ratio of transmission environment, it can be selected under any circumstance by reference to Fig. 6 a completely
Second carrier frequency.
It is 5dB that Fig. 6 c, which show channel SNRs, and first carrier remains with the second carrier frequency spacing
3Hz, first carrier frequency is from 20Hz to 200Hz during consecutive variations, 256DFQAM ber curve.
The feature of curve performance is that the fundamental oscillation position of curve is 10 in the bit error rate first-4Place, illustrates with double
The change of frequent rate, 256DFQAM modulating performance maintain essentially in 10-4Place.Secondly, in first carrier
In the scanning range of frequency, there are 3 obvious bit error rate crests, peak value and vibration average value about 3
The order of magnitude, and 60Hz periodic distribution is presented.In fact, when double frequency difference on the frequency is 6,9 or higher,
Although crest location moves to low frequency end, deviation post very little, and still keeps original cycle value changes.Say
Influence of the size of two carrier frequency spacing of bright 256DFQAM modems to modulating performance is little.
Bit error rate crest height is higher in figure, width is smaller, but modulating performance it is superior stable region it is larger, for us
Design high-quality DFQAM provides condition, illustrates the technical complexity of double frequency quadrature amplitude modulation demodulator
It is relatively low, and be easily achieved.
Fig. 6 a are shown, and f1 is fixed as 10Hz, f2 from 5Hz gradually change to 15Hz when 256DFQAM
The bit error rate.Fig. 7 is shown, and f1 and f2 difference are fixed as 3Hz, and then f1 gradually becomes from 20Hz
To the bit error rate of 256DFQAM during 200Hz.Although both are cyclically-varying curves, Fig. 6 a are bent
Line is Decay Rate oscillating curve, and Fig. 6 c are the substantially constant cyclic curves of amplitude, and both periodic quantity phases
Very big, Fig. 6 a cycle about 1.5Hz, Fig. 6 c the cycle about 60Hz of difference.In any case, two figures illustrate,
Interference between 256DFQAM double frequency be present, this periodically interference, existing phase length, also there is cancellation.
Both ber curves teach that the double frequency frequency that how should select 256DFQAM, just can make double frequency just
The modulating performance of amplitude modulation demodulator is handed over to obtain most preferably.In Fig. 6 b the width of main peak with height almost with noise
Than unrelated, it is the cut-off region of the second carrier wave value to illustrate first carrier frequency main peak width.Trough in Fig. 6 b
Error function attenuation trend is presented with signal to noise ratio and shows more strong than crest, it is excellent to illustrate that DFQAM has
Elegant modulation /demodulation performance.
When N is equal to 3, because three carrier wave cos (w in TFQAM1t)、cos(w2And cos (w t)3T),
Frequency is different, also non-orthogonal, but each carrier wave after converting first phase by that can generate three pairs of mutually orthogonal sons
Carrier wave, i.e. cos (w1And sin (w t)1t)、cos(w2And sin (w t)2t)、cos(w3And sin (w t)3T), so TFQAM
There are six subcarriers modulating binary data simultaneously, its sub-carriers cos (w1And sin (w t)1t)、cos(w2T) and
sin(w2t)、cos(w3And sin (w t)3T) it is orthogonal each other, do not interfere with each other in theory, but cos (w1T) with cos (w2T),
cos(w1T) with cos (w3T), cos (w2T) with cos (w3T), sin (w1T) with sin (w2T), sin (w1T) with sin (w3T), sin (w2t)
With sin (w3T), cos (w1T) with sin (w2T), cos (w1T) with sin (w3T), cos (w2T) with sin (w1T), cos (w2T) with
sin(w3T), cos (w3T) with sin (w1T), cos (w3T) with sin (w2T) between and nonopiate, simply frequency is different, reason
Interfered by upper presence, but disturb very little, when the frequency spacing between three frequencies is larger, interference can neglect
Slightly, but three frequency frequency distances can not possibly infinitely be expanded during real work, particularly GSM is because depositing
Addressed in multiple access, so TFQAM three modulation carrier waves must carry in every height in mobile communication frequency domain
Generated in ripple.
It is in dominant frequency f=200Hz shown in Fig. 7, auxiliary frequency f1 changes to 205Hz from 200Hz, and auxiliary frequency f2 is from 200Hz
When changing to 195Hz, bit error rate curved surface caused by 4096TFQAM, i.e. two auxiliary frequencies centered on dominant frequency to
Bit error rate during two changes of direction.Random binary data 2.4 ten thousand are taken in emulation, sampling frequency is still 90,
Signal to noise ratio is 6, and the red more deep then bit error rate is higher in figure, and the more deep then bit error rate of blueness is lower.As can be seen that
With the change (one becomes big, and one diminishes) of two auxiliary frequencies, the higher crest of the bit error rate and the bit error rate are relatively low
Trough all show periodic distribution, in addition to the main peak bit error rate is maximum, other crests are all smaller, ripple
The cycle that paddy occurs is about 1.5Hz, and this periodically change does not change for the change of another auxiliary frequency
Become, so the position of trough is distributed with rectangular mode.After dominant frequency determines, Fig. 7 can be that selection auxiliary frequency carries
For important references.
Though can continuously reflect the interference relationships of two auxiliary frequencies and dominant frequency shown in Fig. 7, figure is more abstract.Fig. 8
It is shown be still in data be 2.4 ten thousand bits, sampling frequency 90, signal to noise ratio 6dB, dominant frequency f=200Hz,
First auxiliary frequency varies continuously to 205Hz, 4096TFQAM when the second auxiliary frequency f2 takes several particular values from 200Hz
Bit error rate diagram, in wherein Fig. 8 in a the second auxiliary frequency f2=198.5Hz, Fig. 8 b the second auxiliary frequency
In f2=197Hz, Fig. 8 in c the second auxiliary frequency f2=195.5Hz, Fig. 8 d the second auxiliary frequency f2=194Hz.
Obviously, the relation curve of the bit error rate and the first auxiliary frequency is very clear, shows obvious cyclically-varying.More
It is important that the cycle in the case of these four does not all change, illustrate the second auxiliary frequency f2 change to the first auxiliary frequency
F1 and dominant frequency f relation is not much influence.
Fig. 9 show dominant frequency f be respectively 200,20000,2000000,200000000Hz, the second auxiliary frequency
F2 is respectively 194,19994,1999994,199999994Hz, the first auxiliary frequency f1 respectively from 200 gradually to
206Hz (Fig. 9 a), 20000 are gradually to 20006Hz (Fig. 9 b), 2000000 gradually to 2000006Hz
(Fig. 9 c), 200000000 gradually to 200000006Hz (Fig. 9 d) when, 4096TFQAM's
Ber curve.As can be seen that this four oscillating curves are identical, illustrate 4096TFQAM dominant frequency
The selection of other auxiliary frequencies is nor affected on during change, in other words, when other primary conditions are the same, basic frequency can
Arbitrarily to select, and two auxiliary frequencies can equally select according to same period rule.
Shown in Figure 10 and Figure 11, based on frequently be respectively f=200 and 2000000Hz, the second auxiliary frequency f2=197
And 1999997Hz, per data pulse signal sampling frequency fs be respectively 60,90,120,150Hz, first
When auxiliary frequency f1 changes to 206Hz and 2000000 from 200 and changes to 2000006Hz, 4096TFQAM error code
Rate curve.As can be seen that all curves, compared with Fig. 8 Fig. 9 curves, the cycle of oscillation property of all curves is simultaneously
There is no much changes, but the bit error rate change in location of curve is larger, illustrates that sampling frequency can directly affect numeral
The precision of the bit error rate in processing, and it is not related with the size of basic frequency.It should be noted that sampling frequency
Bigger, the complexity of system processing is higher, so the value of sampling frequency, mainly sees the disposal ability of system.
Random binary data value, the sample value and letter of each pulse data taken in Fig. 7, Fig. 8, Fig. 9
Make an uproar what ratio was just as, although basic frequency, the first auxiliary frequency rate and the second auxiliary frequency rate all choose different value respectively,
Particularly the value step-length of basic frequency is also very big, but the cycle of oscillation of their ber curve and vibration are shaken
It is essentially unchanged.Figure 10 and Figure 11 dominant frequency value change is larger, and auxiliary frequency also changes therewith, although sampling frequency
The change of rate changes the precision of the bit error rate, but the cycle of oscillation of ber curve and amplitude of oscillation are essentially unchanged.
In a word, above analog simulation clearly states, in TFQAM modes, three modulated carriers f, f1, f2 because
For after modulation using linear superposition mode, the influence of the change of a carrier frequency to two other modulated carriers
Very little.And sampling frequency fs nor affects on the interference between each modulated carriers, but the precision of the bit error rate can be changed.
Corresponding with above-mentioned modulator approach, the embodiment of the present invention provides a kind of demodulation method flow based on QAM
Schematic diagram, shown in Figure 20, specifically implementation method includes：
Step S201, the analog signal that antenna is received with 2N roads carrier multiplication, obtain the demodulation of 2N roads respectively
Data signal afterwards, wherein, the analog signal is that have passed through the signal after the carrier modulation of the 2N roads, institute
State the road-load ripples of N be according to default carrier frequency generation and each carrier frequency generation two-way it is mutually orthogonal
Carrier wave, N are the positive integer more than 1.
Step S202, the data signal after 2N roads are demodulated carry out the number after parallel-serial conversion is demodulated all the way
Word signal.
In step s 201, the road-load ripples of 2N with the road-load ripples of 2N in above-mentioned modulator approach are identical,
I.e. if that modulator approach uses is cos (w1t)、sin(w1t)、cos(w2t)、sin(w2t)、cos(w3t)、sin(w3T),
It is also cos (w when then demodulating1t)、sin(w1t)、cos(w2t)、sin(w2t)、cos(w3t)、sin(w3t)。
Further, the mutually orthogonal carrier wave of the two-way of each carrier frequency generation be respectively with it is described every
The related sine wave of individual carrier frequency and the cosine wave related to each carrier frequency；
The analog signal that antenna is received with 2N roads carrier multiplication, obtains the number after the demodulation of 2N roads respectively
Word signal, including：
For the carrier wave that the two-way of any one carrier frequency generation is mutually orthogonal, the mould that the antenna is received
Intend the signal sine wave related to any one described carrier frequency to be multiplied to obtain the numeral letter after first via demodulation
Number；
The analog signal that the antenna the receives cosine wave related to any one described carrier frequency is mutually multiplied
Data signal after being demodulated to the second tunnel.
Specifically, it is assumed that N is equal to 2, as shown in figure 3, the demodulation method of the receiving terminal on figure right side is：Connect
It is { the d after wireless channel transmits and adds noise to receive the signal that antenna receivesn, reception system equally makes
With carrier wave cos (w1t)、sin(w1And cos (w t)2t)、sin(w2T) to { dnDemodulation, it is allowed to isolate three roads letter again
Number { e1n}、{e2n}、{e3nAnd { e4n, last parallel serial conversion synthesizes data-signal { g all the waynOutput, it is
Make it that the result of demodulation is more accurate, after the embodiment of the present invention further after the demodulation will be per demodulating all the way
Data signal carry out low-pass filtering treatment, sample process and level conversion respectively, as shown in figure 3, obtaining
Three circuit-switched data signals { g1n }, { g2n }, { g4n } and { g3n }, last parallel serial conversion synthesize data-signal all the way
{ gn } is exported.
Similarly, it is assumed that when N is equal to 4, in receiving terminal, signal { d that reception antenna receivesnIt is { cnPass through
Noisy signal after being influenceed during space channel by noise jamming.System is first by { dnWhile be sent into six it is logical
Road, however with transmitting terminal identical cos (w1t)、sin(w1t)、cos(w2t)、sin(w2t)、cos(w3And sin (w t)3t)
Six carrier waves, respectively to { dnDemodulate simultaneously, it is generated as { e1n}、{e2n}、{e3n}、{e4n}、{e5n}
{ e6nSix tunnel demodulated signals, the tunnel demodulated signals of Zai Dui six carry out LPF, average, sample respectively
Judgement and 4-2 level translations, LPF therein can remove the radio-frequency component in carrier wave, leave including
Low frequency signal including signal, can be in signal due to employing sample value algorithm in low frequency signal
All sample values are averaged, and complete sampling mean, then correct judgement is made to average, are restored to it
The different electric impulse signal of amplitude, then make 4-2 level translations to electric pulse, it is allowed to form six road binary data
{g1n}、{g2n}、{g3n}、{g4n}、{g5nAnd { g6n, merge finally by parallel serial conversion and be generated as all the way two
Binary signal { gn}.Obviously, TFQAM operation principle is as QAM, only in QAM original two
Four tunnels are added on the basis of road in addition.
In order to prove the effect of the high modulation rate of the modulation /demodulation of the embodiment of the present invention, the embodiment of the present invention is led to
The experimentation for crossing progress simulation analysis enters line justification, and details are provided below.
For corresponding DFQAM, Figure 12 show the signal spectrum in 256DFQAM transmitting terminal modulated process
Figure.First, 80 Finite Number binary elements are taken, then each code element frequency 90 is sampled, double frequency carries
Wave frequency rate takes 10Hz and 13Hz respectively, and wireless channel signal to noise ratio takes 5dB.In signal spectrum, base band data
Flow { anIt is binary unit pulse signal, four tunnel binary unit data flows are divided into after serial to parallel conversion
{a1n}、{a2n}、{a3nAnd { a4n, then binary data stream has been transformed into 4 width with 2-4 level translations
Spend the electric pulse data flow { b of level value1n}、{b2n}、{b3nAnd { b4n, again by cos (w1t)、sin(w1t)、
cos(w2And sin (w t)2T) four carrier modulations, four tunnel modulated signal { c are become1n}、{c2n}、{c3nAnd
{c4n, finally merging by parallel serial conversion turns into modulated signal { c all the wayn, transmitting antenna is again by { cnBe sent to
In wireless channel.As can be seen that first three collection of illustrative plates is not adjust pulse signal from signal spectrum, rear three collection of illustrative plates is
Modulated signal is adjusted, because the modulation sampled processing of carrier wave, collection of illustrative plates add sampling frequency density, show load
Ripple modulation phenomenon.
Wherein, Figure 13 show the signal spectrogram during 256DFQAM receiving terminal demodulation process.Receive
That antenna receives is signal { cnInfluenceed by wireless channel noise after noisy signal { dn, then reception system
With with transmitting terminal identical cos (w1t)、sin(w1t)、cos(w2And sin (w t)2T) four carrier wave demodulation { dn, separation
Go out { e1n}、{e2n}、{e3nAnd { e4nFour tunnel demodulated signals, then four tunnels are demodulated with four low pass filters and believed
Low frequency signal including number filtering out comprising data, and sampling number of the low frequency signal within the signal period is made even
Average, see that blueness is low-pass signal in Figure 13 " low pass average ", red is mean value signal, it can be seen that
Mean value signal with the { b in Figure 121n}、{b2n}、{b3nAnd { b4nSignal is similar, simply amplitude is different.
Again after decision operation, the electric impulse signal of four range values is transformed into, passes through 4-2 level translations, shape again
Cheng Silu binary data { g1n}、{g2n}、{g3nAnd { g4n, most recover output signal { g through parallel serial conversion afterwardsn}。
Obviously, first three spectrogram in Figure 13 is the demodulation signal before filtering, in rear three spectrum pulse signals and Figure 12
First three spectrogram is completely corresponding.
Wherein, be shown in Figure 14 with analog simulation and theoretical formula to 16DFQAM, 256DFQAM and
The ber curve that 4096DFQAM is obtained after calculating.Because simulation process is by calculating internal memory and computing capability
Limitation, emulation random data only take 27000 bits, if theoretical curve can with emulation data match,
Theoretical curve can predict the variation relation of the DFQAM bit error rates and signal to noise ratio.It can be seen that three
Kind emulation data and theoretical curve coincide fairly good, thus can be by theoretical curve as a reference to analysis misses
Code check situation.If it is carrier class 10 to take the bit error rate-6Value, it can be seen that 16DFQAM signal to noise ratio is about 2dB,
256DFQAM signal to noise ratio is about 8dB, and 4096DFQAM signal to noise ratio is about 16dB.Due to emulation only
White noise is introduced, the influence of wireless channel is in fact very complicated, and the absolute reference meaning of curve may be little,
But still it may be referred to respect to variation relation.In as shown in figure 14, the relative change span of three curves only has
7~8 dB, but modulation rate ratio is 4:8:12=1:2:3, so DFQAM modulating performance is far superior to
QAM。
From Figure 14 from the point of view of the relative span of three curves, low order DFQAM only needs to increase several dB,
It is obtained with one times such as the high order modulation-demodulation ability of oneself.At present, it is using highest QAM modes
1024QAM, theoretic snr threshold are more than 40dB, and environmental condition requires harsh, can only worked
In cable television and short-distance wireless communication field.High-order DFQAM because its unit free degree modulation bit number compared with
Few, wherein 256DFQAM and 4096DFQAM are 2 bits and 3 bits respectively, with 16QAM and
64QAM is the same, and both modes are applied in LTE, illustrates unit free degree modulation bit number 2
QAM when bit and 3 bit adapts to mobile communication environment completely, thus 256DFQAM and
4096DFQAM snr threshold should not be high.Further, since DFQAM is the maturation based on QAM
Technology, from the point of view of basic functional principle, it is very nearly the same with QAM, it is necessary to consider mainly double frequency interference and
The problems such as double frequency utilization of resources, thus the difficulty and advantage of lower cost realized, there are higher research and development potentiality
And application value.
It is at two because quadrature amplitude modulation demodulator QAM is a kind of mature technology being widely used
Phase differs the modulation demodulation system for realizing amplitude shift keying (ASK) on 90 degree of same frequency carrier wave simultaneously, is mesh
Preceding performance is best, speed highest modem, one times up to ASK of modulation rate.Due to ASK
Order of modulation depend on carrier amplitude step number, be modulation accuracy technical bottleneck, such as shaking for 64QAM
Width modulation step number is positive and negative 8 grades of level, and 256QAM Modulation and Amplitude Modulation step number is positive and negative 16 grades of level,
1024QAM Modulation and Amplitude Modulation step number is up to positive and negative 32 grades of level.Again because mobile communication transmission power has
Strict standard, as transmission power of the LTE base station in 20MHz bandwidth is generally 20W (43dB), quilt
After 1200 subcarriers are average, each subcarrier transmitting power is about 0.0167W (12.23dB), and UE is received
The RSRP power at end is exactly the mean power of subcarrier.Obviously, when Modulation and Amplitude Modulation level number is excessive, connect
Receiving end will be unable to differentiate.So the most high-order base-band digital modem that LTE is supported is 64QAM, say
Can't be exceeded by being capable of the step number of the amplitude modulation(PAM) of normal work under bright mobile environment so far by positive and negative 8 grades
Level, and can be as the basic reference in practical application.
Figure 15 show be the different modulating exponent number of QAM and DFQAM from low to high digital modulation and demodulation
The ber curve of mode.Bit data 36000 is taken, per bit data sampling frequency 90, QAM carrier waves
Frequency is 200Hz, and DFQAM carrier frequencies are respectively 200Hz and 203Hz, the basic work with reference to shown in figure 3
Make principle, two-dimentional 4QAM, 16QAM, 64QAM and the four-dimension are respectively obtained by emulation and theoretical formula
16DFQAM, 256DFQAM, 4016DFQAM totally six three class ber curves.As can be seen that 6
Bar curve is divided into 3 clusters, there is that two unit modulation free degree bit numbers are identical, total order of modulation is different per cluster
Modulation /demodulation ber curve.The signal to noise ratio spacing of three cluster curves is essentially identical.
Compare two kinds of modulation systems of 16DFQAM and 16QAM, both the characteristics of be modulation constellation points all
It is 16, there is identical modulation capability, but as can be seen from Figure 15, in same bit error rate, 16QAM
Signal to noise ratio be higher by 16DFQAM at least 4dB, to find out its cause, certainly the unit modulation free degree includes
Bit number is different, and 16QAM each modulates the free degree and include 2 bit datas, everyone modulation of 16DFQAM
The free degree includes 1 bit data, illustrates that it is to determine digital modems often to modulate the free degree to include bit number
Key factor.Secondly, compare 64QAM and two kinds of modulation systems of 4096DFQAM, both the characteristics of
It is that the bit number that each modulation free degree includes is equal, is all 3 bits, but both modulation rates differ
Very big, the bit number of 64QAM modulation symbols is but up to for the bit number of 6,4096DFQAM modulation symbols
12, the latter is the former one times.As can be seen from Figure 15, in same bit error rate, 4096DFQAM
Signal to noise ratio only more than 64QAM 3dB, i.e., can bring 1 times of modulation rate with 1 times of signal power.
Because the precision of QAM modes is still limited by the demodulation accuracy of amplitude leyel, with positive and negative 8 grades modulation electricity
The 64QAM of flat work is applied to LTE system, illustrates 8 grades of amplitude leyel demodulation in moving communicating field
Using.If it is all numeral tune corresponding to the DFQAM of positive and negative 8 grades of modulation levels work as reference
Mode 4096DFQAM processed, according to Figure 15,4096DFQAM ber curve is more or less the same,
But the bit number of modulation symbol is very big, reaches 12.In fact, the most high-order QAM of current communication system applications
It is 1024QAM, but because of 32 grades of level value modulated signals, after mobile radio channel transmits, is difficult
Correctly differentiated for reception system, the height of its bit error rate, the basic standard of GSM can not be met completely.
However, 4098DFQAM uses 8 grades of multilevel modulation techniques, it can but reach 4 times of 1024QAM
Modulation rate, on the premise of same bit error rate, signal to noise ratio is only higher by 3dB than 64QAM.
For TFQAM, Figure 16 show the signal spectrum in 4096TFQAM transmitting terminal modulated process
Figure.First, 120 Finite Number binary elements are taken, then each code element frequency values 90 are sampled, wherein
Three carrier waves take 200Hz, 203Hz and 197Hz, i.e. dominant frequency f=200Hz respectively, auxiliary frequency f1=f+3, auxiliary frequency f2=f-3,
Wireless channel signal to noise ratio snr=5dB.In signal spectrum, base-band data stream { anIt is binary unit pulse list
Side signal, the unilateral signal { a of six tunnel binary unit data pulses is divided into after serial to parallel conversion1n}、{a2n}、
{a3n}、{a4n}、{a5nAnd { a6n, then binary data stream is transformed into 4 with 2-4 level translations
Bilateral signal { the b of electric pulse data of level value1n}、{b2n}、{b3n}、{b4n}、{b5nAnd { b6n, pass through again
cos(w1t)、sin(w1t)、cos(w2t)、sin(w2t)、cos(w3And sin (w t)3T) six tunnel carrier modulation, becomes
Six tunnel modulated signal { c1n}、{c2n}、{c3n}、{c4n}、{c5nAnd { c6n, finally merge by parallel serial conversion
As modulated signal { c all the wayn, transmitting antenna is again by { cnBe sent in wireless channel.Can be with from signal spectrum
Find out, first three collection of illustrative plates is not adjust pulse signal, and rear three collection of illustrative plates is modulated modulated signal, wherein { c1n}~{ c6nTable
Reveal obvious four am signals frequency spectrum pattern.
Figure 17 show the signal spectrogram during 4096TFQAM receiving terminal demodulation process.Reception antenna is received
To be noisy signal { d after being influenceed by wireless channel noisen, then reception system is with identical with transmitting terminal
Cos (w1t)、sin(w1t)、cos(w2t)、sin(w2t)、cos(w3And sin (w t)3T) six road-load ripples are respectively pair plus letter of making an uproar
Number { dnDemodulate simultaneously, isolate { e1n}、{e2n}、{e3n}、{e4n}、{e5nAnd { e6nSix tunnel demodulated signals,
Low frequency signal including again being filtered out six tunnel demodulated signals comprising data with six low pass filters, and to low
Sampling number of the frequency signal within the signal period is averaged, and sees that blueness is low communication in Figure 17 " low pass average "
Number, red is mean value signal, it can be seen that mean value signal with the { b in Figure 161n}、{b2n}、{b3n}、
{b4n}、{b5nAnd { b6nSignal is similar, simply amplitude is different.Again after decision operation, it is transformed into
The bilateral signal of electric pulse with four range values, pass through 4-2 level translations again, form six road binary data
Unilateral pulse signal { g1n}、{g2n}、{g3n}、{g4n}、{g5nAnd { g6n, most recover afterwards through parallel serial conversion
Output signal { gn}.Obviously, first three spectrogram in Figure 17 is the demodulation signal before filtering, and rear three spectrogram is complete
It is all-trans to first three spectrogram replicated in Figure 16.
It is 16DFQAM, 256DFQAM and 4096DFQAM bit error rate shown in Figure 18, is according to figure
The 4096TFQAM ber curves that 5 basic functional principle analog simulation and theoretical formula obtains, wherein managing
Directly proportional to error function by curve, adjusting parameter Ae=0.5, Be=0.95, SNR are the letters that unit is dB
Make an uproar ratio, formula expression is：
Because analog simulation process is limited by internal memory and computing capability is calculated, emulation random data only takes
36000 bit symbols, it is carrier wave dominant frequency f=200Hz, auxiliary frequency f1=203Hz, auxiliary per symbol sampling frequency 90
Frequency f2=197Hz.If theoretical curve can coincide with emulation data, theoretical curve can predict 4096TFQAM
The relation of the bit error rate and signal to noise ratio.As can be seen from Figure 18, data are emulated and coincide quite with theoretical curve
It is good, thus can be by theoretical curve as a reference to analysis 4096TFQAM bit error rate situation.If take mistake
Code check is standard carrier class 10-6Value, 4096TFQAM signal to noise ratio are less than 11dB.Because emulation only introduces
White noise, the influence of wireless channel is in fact very complicated, if it is considered that the complexity of channel circumstance, signal to noise ratio
Also it is not more than 20dB.However, be at present 1024QAM using top step number QAM, theoretic noise
It is more than 40dB than threshold value, by comparison, 4096TFQAM modulating performance is really extraordinary.It is heavier
Want, its binary bits number modulation rate improves 20% than the 1024QAM of current top step number.
In addition, from operation principle, the QAM of TFQAM and technology maturation is not much difference, realizes difficulty
Very little.So TFQAM has higher research and development potentiality and application value.
It is in two phases because quadrature amplitude modulation demodulator QAM is a kind of widely used mature technology
Amplitude shift keying (ASK) modulation demodulation system is realized in 90 degree of difference, orthogonal same frequency carrier wave simultaneously,
It is that current performance is best, modulation rate highest modulation-demodulation technique, because modulation accuracy is limited to amplitude exponent number,
GSM can not apply high-order QAM, therefore, only with applied to the 16QAM in LTE and
64QAM is compared with 4096TFQAM.16QAM Modulation and Amplitude Modulation step number is positive and negative 4 grades of level,
64QAM Modulation and Amplitude Modulation step number is positive and negative 8 grades of level, and Modulation and Amplitude Modulation level exponent number is higher, modulation accuracy
Poorer, receiving terminal technology is more complicated, it is contemplated that the design concept and LTE system business number of mobile communication terminal
According to the basic demand of speed, the most high-order baseband digital modulator that LTE system uses is 64QAM.
It is understood that TFQAM is based on technology maturation, widely used QAM, operation principle shows
It is that two auxiliary frequencies are added on the basis of QAM dominant frequency, or in original two modulation of QAM freely
Four modulation frees degree are added on degree, thus are called sextuple three frequency quadrature amplitude modulation demodulators, so
TFQAM modulation rate is three times of QAM.Compared with 4 grades of modulation levels of identical, QAM can only
It is 16QAM, the binary bits digit that each modulation symbol is included only has 4 bits, and TFQAM is then
4096TFQAM, the binary bits digit that each modulation symbol includes can be up to 12 bits, and it is modulated
Number of bits is higher by 2 bits than current highest 1024QAM.In terms of reception technique, 4 grades of level modulations
Demodulation is the basic fundamental of ASK digital modulation and demodulations, and any equipment only needs simple modulation-demodulation technique can
To realize.
Figure 19 show be tri- kinds of modulation systems of 16QAM, 64QAM and 4096TFQAM the bit error rate it is bent
Line chart.Bit data 48000 is taken, per bit data sampling frequency 90, QAM carrier frequency is 200Hz,
TFQAM carrier frequencies are respectively 200,197 and 203Hz, and figure is respectively obtained by emulation and theoretical formula
Curve shown in 19.As can be seen that theoretical curve and the special number of emulation coincide fairly good.TFQAM curves position
Between 16QAM and 64QAM, if from the point of view of modulation /demodulation performance, TFQAM is less than 16QAM,
But it is higher than 64QAM.If being analyzed from modulation rate, 16QAM is 4 bits per symbol-modulated number of bits,
64QAM is 6 bits per symbol-modulated number of bits, and TFQAM is 12 bits per symbol-modulated number of bits,
TFQAM modulation rate is three times of 16QAM, is twice of 64QAM.Obviously, TFQAM
Combination property will be significantly larger than 16QAM and 64QAM.TFQAM is based on QAM technologies, in fact
Now getting up should be easier than other new and high technology schemes with mature technology for no reason at all.Although TFQAM needs three
Individual carrier frequency simultaneously participates in modulation /demodulation, but the selection of three carrier frequency has more flexible range of choice, because
The interference of three carrier frequency has periodically, can be by cycle relatively low auxiliary of the selection bit error rate after basic frequency determines
Frequently, because the cycle of major-minor frequency is smaller, two symmetrical auxiliary frequencies close to dominant frequency can be selected, can
So that the gap of three modulated carriers is smaller as far as possible.In mobile communications, should when selecting major-minor carrier frequency
Consider the scope of each subcarrier bandwidth in a frequency domain, using do not influence in multiple access addressing each subcarrier individual transmission as
Important alternative condition.
It should be noted that N value is not to be the bigger the better, although N value is bigger, it is meant that is adjusted
Make the speed of demodulation is faster, but N value is bigger, it is more equal to carrier frequency, so just occupy compared with
More carrier frequency, corresponding to for LTE system, each subcarrier can access a user in frequency division multiple access,
If too many subcarrier, by same user occupancy, the number of users equal to access is just reduced, so N's takes
Value is bigger, is not advantageous to communicate, therefore the value of General N of the embodiment of the present invention is 2 or 3.
Based on identical technical concept, the embodiment of the present invention also provides a kind of modulation based on QAM, demodulation dress
Put, wherein modulating device is as shown in figure 21, including：Serioparallel exchange unit 401, carrier generation unit 402,
Modulating unit 403, linear superposition unit 404, wherein：
Serioparallel exchange unit 401,2N roads are obtained for data signal to be sent all the way to be carried out into serioparallel exchange
Data signal to be modulated, N are the positive integer more than 1；
Carrier generation unit 402, for generating N number of carrier wave respectively according to default N number of carrier frequency
The road-load ripples of 2N of frequency dependence, wherein, the mutually orthogonal carrier wave of each carrier frequency generation two-way；
Modulating unit 403, for by 2N roads data signal to be modulated respectively with the road-load ripples of the 2N
It is multiplied, obtains the analog signal after the modulation of 2N roads；
Linear superposition unit 404, pass through day after carrying out linear superposition for the analog signal after 2N roads are modulated
Line exports.
Further, the carrier generation unit 402 is specifically used for：For first carrier frequency, generation one
It is individual with the sine wave of the first carrier frequency dependence and one with the cosine of the first carrier frequency dependence
Ripple, the first carrier frequency are any one in default N number of carrier frequency；
The modulating unit 403 is specifically used for：For first carrier frequency, by first via numeral to be modulated
Signal is multiplied with the sine wave of the first carrier frequency dependence, obtains the analog signal after first via modulation；
Second tunnel data signal to be modulated is multiplied with the cosine wave of the first carrier frequency dependence, obtains second
Analog signal after the modulation of road；First via data signal to be modulated and second tunnel number to be modulated
Word signal is any two-way in the data signal to be modulated of the 2N roads.
Further, in addition to：Level conversion unit 405, for 2N roads numeral to be modulated to be believed
Number level conversion is carried out, the 2N roads for obtaining having multiple amplitudes to change data signal to be modulated.
Preferably, the value of the N is 2 or 3, further, its in default N number of carrier frequency
In a carrier frequency be dominant frequency, the value of remaining N-1 carrier frequency is outside the peak width of dominant frequency.
It is preferred that the value of remaining N-1 carrier frequency corresponds to the trough outside the peak width of dominant frequency.
When N value is equal to 3, the value of remaining 2 carrier frequency is symmetrically divided with dominant frequency
On the trough of cloth.
Based on the inventive concept same with demodulation method, the embodiment of the present invention further provides one kind and is based on
QAM demodulating equipment, as shown in figure 22, including：Demodulating unit 501, parallel serial conversion unit 502, its
In：
Demodulating unit 501, the analog signal for antenna to be received obtain 2N respectively with 2N roads carrier multiplication
Data signal after the demodulation of road, wherein, the analog signal is that have passed through the letter after the carrier modulation of the 2N roads
Number, the road-load ripples of N be according to default carrier frequency generation and each carrier frequency generation two-way it is mutual
Orthogonal carrier wave, N are the positive integer more than 1；
Parallel serial conversion unit 502, carry out parallel-serial conversion for the data signal after 2N roads are demodulated and obtain all the way
Data signal after demodulation.
Further, the mutually orthogonal carrier wave of the two-way of each carrier frequency generation be respectively with it is described every
The related sine wave of individual carrier frequency and the cosine wave related to each carrier frequency；
The demodulating unit 501 is specifically used for：It is mutually orthogonal for the two-way of any one carrier frequency generation
Carrier wave, by the analog signal that the antenna the receives sine wave phase related to any one described carrier frequency
Data signal after the multiplied demodulation to the first via；
The analog signal that the antenna the receives cosine wave related to any one described carrier frequency is mutually multiplied
Data signal after being demodulated to the second tunnel.
Preferably, the value of the N is 2 or 3, further, its in default N number of carrier frequency
In a carrier frequency be dominant frequency, the value of remaining N-1 carrier frequency is outside the peak width of dominant frequency.
It is preferred that the value of remaining N-1 carrier frequency corresponds to the trough outside the peak width of dominant frequency.
When N value is equal to 3, the value of remaining 2 carrier frequency is symmetrically divided with dominant frequency
On the trough of cloth.
In summary, the embodiment of the present invention is based on current ripe QAM technologies, on original QAM basis
On, one or more than one carrier frequency are further added by, each carrier frequency correspondingly generates two-way mutually just
The carrier wave of friendship, by 2N roads data signal to be modulated respectively with 2N roads carrier multiplication, obtain 2N
Analog signal after the modulation of road, then by demodulation method, analog signal is demodulated into number using same carrier wave
Word signal, that is to say, that equal to two QAM or two or more QAM are realized simultaneously, so that traditional two
Orthogonal dimension amplitude modulation technique is changed into four-dimensional or sextuple quadrature amplitude modulation and demodulation method, is ensureing
While modulation /demodulation effect, higher modulation rate is realized, so as to meet the requirement of 5G communication systems.
The present invention is with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Flow chart and/or block diagram describe.It should be understood that can by computer program instructions implementation process figure and/
Or each flow in block diagram and/or square frame and flow in flow chart and/or block diagram and/or
The combination of square frame.These computer program instructions can be provided to all-purpose computer, special-purpose computer, embedded
Processor or the processor of other programmable data processing devices are to produce a machine so that pass through computer
Or the instruction of the computing device of other programmable data processing devices is produced for realizing in one stream of flow chart
The device for the function of being specified in journey or multiple flows and/or one square frame of block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices
In the computer-readable memory to work in a specific way so that be stored in the computer-readable memory
Instruction produces the manufacture for including command device, and the command device is realized in one flow of flow chart or multiple streams
The function of being specified in one square frame of journey and/or block diagram or multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices, made
Obtain and series of operation steps is performed on computer or other programmable devices to produce computer implemented place
Reason, so as to which the instruction that is performed on computer or other programmable devices is provided for realizing in flow chart one
The step of function of being specified in flow or multiple flows and/or one square frame of block diagram or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creative concept, then other change and modification can be made to these embodiments.So appended right will
Ask and be intended to be construed to include preferred embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without departing from this hair to the present invention
Bright spirit and scope.So, if the present invention these modifications and variations belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprising including these changes and modification.
Claims (26)
1. a kind of modulator approach based on QAM, it is characterised in that this method includes：
Data signal to be sent all the way is subjected to serioparallel exchange and obtains 2N roads data signal to be modulated, N is
Positive integer more than 1；
The related road-load ripples of 2N of N number of carrier frequency are generated according to default N number of carrier frequency respectively,
Wherein, the mutually orthogonal carrier wave of each carrier frequency generation two-way；
By 2N roads data signal to be modulated respectively with 2N roads carrier multiplication, 2N roads tune is obtained
Analog signal after system；
Analog signal after 2N roads are modulated is exported after carrying out linear superposition by antenna.
2. the method as described in claim 1, it is characterised in that described according to default two carrier frequencies
The road-load ripples of 2N are generated respectively, including：
For first carrier frequency, generation one and the sine wave of the first carrier frequency dependence and one and
The cosine wave of the first carrier frequency dependence, the first carrier frequency are default N number of carrier frequency
Any one in rate；
2N roads data signal to be modulated is multiplied with 2N roads quadrature carrier respectively, obtains 2N
Analog signal after the modulation of road, including：
For first carrier frequency, by first via data signal to be modulated and the first carrier frequency dependence
Sine wave be multiplied, obtain the first via modulation after analog signal；By the second tunnel data signal to be modulated with
The cosine wave of the first carrier frequency dependence is multiplied, and obtains the analog signal after the modulation of the second tunnel；Described
Data signal to be modulated and second tunnel data signal to be modulated are to be modulated for the 2N roads all the way
Any two-way in data signal.
3. the method as described in claim 1, it is characterised in that the railway digital by user's input is believed
Number source is carried out after serioparallel exchange obtains 2N roads data signal to be modulated, by the 2N railway digitals signal point
Before not being multiplied with 2N roads quadrature carrier, including：
2N roads data signal to be modulated is subjected to level conversion, obtains having what multiple amplitudes changed
2N roads data signal to be modulated.
4. the method as described in claims 1 to 3 any one, it is characterised in that the value of the N is
2 or 3.
5. the method as described in claims 1 to 3 any one, it is characterised in that default N number of carrier wave
One of carrier frequency is dominant frequency in frequency, the peak width of the value of remaining N-1 carrier frequency in dominant frequency
Outside.
6. method as claimed in claim 5, it is characterised in that the value of remaining N-1 carrier frequency
Trough outside the peak width of corresponding dominant frequency.
7. method as claimed in claim 6, it is characterised in that when N value be equal to 3 when, it is described its
The value of 2 remaining carrier frequencies is on the trough symmetrical with dominant frequency.
8. a kind of demodulation method based on QAM, it is characterised in that this method includes：
The analog signal that antenna is received with 2N roads carrier multiplication, obtains the numeral letter after the demodulation of 2N roads respectively
Number, wherein, the analog signal is that have passed through the signal after the carrier modulation of the 2N roads, and the N is road-load
Ripple is to generate the mutually orthogonal carrier wave of two-way, N according to the generation of default carrier frequency and each carrier frequency
For the positive integer more than 1；
Data signal after 2N roads are demodulated carries out the data signal after parallel-serial conversion is demodulated all the way.
9. method as claimed in claim 8, it is characterised in that the two-way of each carrier frequency generation
Mutually orthogonal carrier wave be respectively the sine wave related to each carrier frequency and with each carrier frequency
The related cosine wave of rate；
The analog signal that antenna is received with 2N roads carrier multiplication, obtains the number after the demodulation of 2N roads respectively
Word signal, including：
For the carrier wave that the two-way of any one carrier frequency generation is mutually orthogonal, the mould that the antenna is received
Intend the signal sine wave related to any one described carrier frequency to be multiplied to obtain the numeral letter after first via demodulation
Number；
The analog signal that the antenna the receives cosine wave related to any one described carrier frequency is mutually multiplied
Data signal after being demodulated to the second tunnel.
10. the method as described in claim 8 to 9 any one, it is characterised in that the value of the N
For 2 or 3.
11. the method as described in claim 8 to 9 any one, it is characterised in that default N number of load
One of carrier frequency is dominant frequency in wave frequency rate, and the value of remaining N-1 carrier frequency is at the peak of dominant frequency
Outside width.
12. method as claimed in claim 11, it is characterised in that remaining N-1 carrier frequency takes
Trough outside the peak width of the corresponding dominant frequency of value.
13. method as claimed in claim 12, it is characterised in that described when N value is equal to 3
The value of remaining 2 carrier frequency is on the trough symmetrical with dominant frequency.
14. a kind of modulating device based on QAM, it is characterised in that the device includes：
Serioparallel exchange unit, wait to adjust for data signal progress serioparallel exchange to be sent all the way to be obtained into 2N roads
The data signal of system, N are the positive integer more than 1；
Carrier generation unit, for generating N number of carrier frequency respectively according to default N number of carrier frequency
The related road-load ripples of 2N, wherein, the mutually orthogonal carrier wave of each carrier frequency generation two-way；
Modulating unit, for by 2N roads data signal to be modulated respectively with 2N roads carrier multiplication,
Obtain the analog signal after the modulation of 2N roads；
Linear superposition unit, for defeated by antenna after the analog signal progress linear superposition after 2N roads are modulated
Go out.
15. device as claimed in claim 14, it is characterised in that the carrier generation unit is specifically used for：
For first carrier frequency, generation one and the sine wave of the first carrier frequency dependence and one and
The cosine wave of the first carrier frequency dependence, the first carrier frequency are default N number of carrier frequency
Any one in rate；
The modulating unit is specifically used for：For first carrier frequency, by first via data signal to be modulated
It is multiplied with the sine wave of the first carrier frequency dependence, obtains the analog signal after first via modulation；By
Two tunnels data signal to be modulated is multiplied with the cosine wave of the first carrier frequency dependence, obtains the second road tune
Analog signal after system；First via data signal to be modulated and second tunnel it is to be modulated numeral letter
Number for any two-way in the data signal to be modulated of the 2N roads.
16. device as claimed in claim 14, it is characterised in that also include：
Level conversion unit, for 2N roads data signal to be modulated to be carried out into level conversion, had
There is the 2N roads of multiple amplitudes change data signal to be modulated.
17. the device as described in claim 14 to 16 any one, it is characterised in that the N's takes
It is worth for 2 or 3.
18. the device as described in claim 14 to 16 any one, it is characterised in that default N number of
One of carrier frequency is dominant frequency in carrier frequency, and the value of remaining N-1 carrier frequency is in dominant frequency
Outside peak width.
19. device as claimed in claim 18, it is characterised in that remaining N-1 carrier frequency takes
Trough outside the peak width of the corresponding dominant frequency of value.
20. device as claimed in claim 19, it is characterised in that described when N value is equal to 3
The value of remaining 2 carrier frequency is on the trough symmetrical with dominant frequency.
21. a kind of demodulating equipment based on QAM, it is characterised in that the device includes：
Demodulating unit, the analog signal for antenna to be received obtain 2N roads respectively with 2N roads carrier multiplication
Data signal after demodulation, wherein, the analog signal is that have passed through the signal after the carrier modulation of the 2N roads,
The road-load ripples of N be according to default carrier frequency generation and each carrier frequency generation two-way it is mutually orthogonal
Carrier wave, N is positive integer more than 1；
Parallel serial conversion unit, carry out parallel-serial conversion for the data signal after 2N roads are demodulated and demodulated all the way
Data signal afterwards.
22. device as claimed in claim 21, it is characterised in that the two of each carrier frequency generation
The mutually orthogonal carrier wave in road be respectively the sine wave related to each carrier frequency and with each carrier wave
The cosine wave of frequency dependence；
The demodulating unit is specifically used for：For the load that the two-way of any one carrier frequency generation is mutually orthogonal
Ripple, the analog signal that the antenna the receives sine wave related to any one described carrier frequency is mutually multiplied
Data signal after being demodulated to the first via；
The analog signal that the antenna the receives cosine wave related to any one described carrier frequency is mutually multiplied
Data signal after being demodulated to the second tunnel.
23. the device as described in claim 21 to 22 any one, it is characterised in that the N's takes
It is worth for 2 or 3.
24. the device as described in claim 21 to 22 any one, it is characterised in that default N number of
One of carrier frequency is dominant frequency in carrier frequency, and the value of remaining N-1 carrier frequency is in dominant frequency
Outside peak width.
25. device as claimed in claim 24, it is characterised in that remaining N-1 carrier frequency takes
Trough outside the peak width of the corresponding dominant frequency of value.
26. device as claimed in claim 25, it is characterised in that described when N value is equal to 3
The value of remaining 2 carrier frequency is on the trough symmetrical with dominant frequency.
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