CN1259791C - Modulating device and method for digital signal coding - Google Patents
Modulating device and method for digital signal coding Download PDFInfo
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- CN1259791C CN1259791C CN 03148201 CN03148201A CN1259791C CN 1259791 C CN1259791 C CN 1259791C CN 03148201 CN03148201 CN 03148201 CN 03148201 A CN03148201 A CN 03148201A CN 1259791 C CN1259791 C CN 1259791C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/12—Modulator circuits; Transmitter circuits
Abstract
The present invention discloses a digital signal code modulating device which is used for modulating 3D codes for transmitting digital signals. The present invention comprises a characteristic fundamental frequency controller f<i>(t), a characteristic fundamental wave shape controller Z<m>, a characteristic fundamental wave oscillation amplitude controller V<r>(t), a frequency and wave shape controlled fundamental wave generator, a D/A converter and a buffering and gain controlled amplifier, wherein under the control of the characteristic fundamental frequency controller f<i>(t) and the characteristic fundamental wave shape controller Z<m>, the frequency and wave shape controlled fundamental wave generator generates a frequency and shape modulating signal Z<m>, f=piZ<m>{2 pif<i>(t) }; the D/A converter is used for converting a digital signal expressed by the frequency and shape modulating signal Zm, f into an analog signal, and finally, under the control of the fundamental wave oscillation amplitude controller V<r>(t), the buffering and gain controlled amplifier carries out amplitude modulation to the analog Zm, f signal output by the D/A converter to form modulated characteristic fundamental wave signal output. The present invention also discloses a digital signal code modulating method.
Description
Technical field
The present invention relates to a kind of coded modulation device of signal, relate in particular to digital signal is carried out code modulated device and method.
Background technology
In the signal processing technology,, before sending, modulates signal usually in order to improve information transmission efficiency and reliability.Modulation is exactly the process of the signal that the signal transformation with the analog or digital form becomes to be adapted at transmitting in the channel.Under the nervous condition of limited of radio spectrum resources, people expect to adopt suitable signal modulation system usually, improve the signal transfer rate of channel, with at the more signal of band-limited channel.
For the digital signal that will transmit, digital signal need be modulated on radio frequency (RF) carrier wave usually and could send.Described carriers carry the digital information that need to transmit.Because it is sinusoidal wave that radio-frequency carrier is generally, its three outstanding characteristics are amplitude, phase place and frequency, therefore the transmission of digital signal can be defined as such process, promptly earlier digital signal is modulated into amplitude, phase place or the frequency of RF carrier wave, or the combination in any of the two, carry out the transmission of RF carrier signal then.The general expression formula of RF carrier wave is:
s(t)＝A(t)exp(ω
ct+θ(t))………………(1)
ω wherein
cBe the angular frequency of carrier wave, θ (t) is covert position when being, the angular frequency of RF carrier wave and the relation of its frequency are: ω
c=2 π f
cThe digital signal of needs transmission is modulated to the transmission that just can realize digital signal on the above-mentioned carrier wave with amplitude modulation or frequency modulation (phase modulation) form.
Modulation and chnnel coding are the important component parts in the digital communication system, and digital modulation is the process of analog form that digital information is mapped to, so that this information can be transmitted in channel.Carry out the modulation of digital signal according to above-mentioned (1) formula, what in fact carry out is the one-dimensional modulation mode of amplitude modulation or frequency modulation (phase modulation), the information-bearing resource of carrier wave is not fully used, and makes that when channel width was limited, utilization rate of channel resources or capacity can not further improve.
Summary of the invention
For addressing the above problem, the objective of the invention is to, a kind of modulating device of digital signal encoding efficiently and method are provided, use this device or method can make full use of the bearing resource of carrier information, thereby improve utilization rate of channel resources or capacity.
For achieving the above object, digital signal encoding modulating device provided by the invention is used for the coded modulation to needs transmission digital signal, comprising:
Feature fundamental frequency controller f
i(t), be used to store the frequency schedule of predetermined used all Frequency points of feature first-harmonic, according to the frequency of described digital signal and described frequency schedule controlling features first-harmonic; Described frequency schedule is: TABLEf
i[]={ 1/f
iN}, i={1 wherein, 2 ..., n}, n are that the frequency of predetermined used feature first-harmonic is counted, the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into;
Feature fundamental waveform controller Z
m, be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table is: TABLEZ
m[]={ Z
m(2 π n/ (N-1)) }, wherein, m is the number of predetermined feature first-harmonic, Z
mBe m feature first-harmonic, n is a predetermined complete characterization first-harmonic envelope discrete point, n={0 ..., N-1};
Feature amplitude of first harmonic controller V
r(t), be used to store used feature first harmonic magnitude tables of data, according to the amplitude of described digital signal and described amplitude data table controlling features first-harmonic; Described amplitude data table is:
TABLEV
r[]={ A* (r/R) }, r=R, R-1 ..., 2,1; R is the isodisperse that evenly is divided into predetermined amplitude A;
The controlled fundamental wave generator of frequency and waveform is at feature fundamental frequency controller f
i(t) and feature fundamental waveform controller Z
mControl under, produce frequency modulation and transfer shape signal Z
M, f=∏ Z
m{ 2 π f
i(t) }; Wherein, ∏ represents from m feature first-harmonic Z
m{ 2 π f
i(t) } select one in;
D/A converter is used for described frequency modulation is transferred shape signal Z
M, fThe digital signal of expressing is converted into analog signal;
Buffering and gain controlled amplifier are at feature amplitude of first harmonic controller V
r(t) under the control, to the simulation Z of D/A converter output
M, fSignal carries out amplitude modulation(PAM), forms modulated feature fundamental signal output; Described modulated feature fundamental signal u (t)=V
r(t) ∏ Z
m{ 2 π f
i(t) }.
Described device also comprises:
Trellis encoder is used for the digital signal of input is carried out grid coding, and the parallel feature fundamental frequency controller f that sends into of the digital signal after will encoding
i(t), feature fundamental waveform controller Z
mWith feature amplitude of first harmonic controller V
r(t).
Deserializer, the serial digital signal that is used for transmitting is a parallel digital signal, and the parallel digital signal after will changing is sent into described trellis encoder.
Frequency modulator is used for and will exports behind modulated feature fundamental signal u (t) frequency modulation.
Quadrature two paths of digital signals coded modulation device based on above-mentioned digital signal encoding modulating device provided by the invention comprises the first and second digital signal encoding modulating devices, also comprises:
First balanced modulator is used for the first modulated feature fundamental signal to first digital signal encoding modulating device output and carries out amplitude modulation with sinusoidal carrier or cosine carrier and modulate;
Second balanced modulator is used for the second modulated feature fundamental signal to second digital signal encoding modulating device output and carries out amplitude modulation with cosine carrier or sinusoidal carrier and modulate;
Comprehensive adder is used for the modulation signal that synthetic first balanced modulator and second balanced modulator are exported, and forms the output of quadrature two road modulated carrier signals.
Multiple carrier digital signal coded modulation device based on above-mentioned quadrature two paths of digital signals coded modulation device provided by the invention comprises at least two quadrature two paths of digital signals coded modulation devices, also comprises:
The multichannel adder is used for quadrature two road modulated carrier signals that synthetic above-mentioned at least two quadrature two paths of digital signals coded modulation devices are exported, and forms the output of multichannel quadrature modulated carrier signal.
Multiple carrier digital signal coded modulation device based on above-mentioned digital signal encoding modulating device provided by the invention comprises at least two digital signal encoding modulating devices, also comprises:
The multichannel adder is used for the modulated carrier signal that synthetic above-mentioned at least two digital signal encoding modulating devices are exported, and forms the output of multichannel modulated carrier signal;
Quadrature two road multiple carrier digital signal coded modulation devices based on above-mentioned multiple carrier digital signal coded modulation device provided by the invention comprise the first and second multichannel modulated carrier digital signal encoding modulating devices, also comprise:
First balanced modulator is used for the first multichannel modulated carrier signal to first multichannel modulated carrier digital signal encoding modulating device output and carries out amplitude modulation with sinusoidal carrier or cosine carrier and modulate;
Second balanced modulator is used for the second multichannel modulated carrier signal to second multichannel modulated carrier digital signal encoding modulating device output and carries out amplitude modulation with cosine carrier or sinusoidal carrier and modulate;
Comprehensive adder is used for the modulation signal that synthetic first balanced modulator and second balanced modulator are exported, and forms the output of quadrature two road multicarrier modulated signals.
Digital signal modulating mehtod provided by the invention comprises:
Set up the normalization data table and the used feature first harmonic magnitude tables of data of the envelope value of the frequency schedule of used all Frequency points of feature first-harmonic, used feature first-harmonic;
Described frequency schedule is: TABLEf
i[]={ 1/f
iN}, i={1 wherein, 2 ..., n}, n are that the frequency of predetermined used feature first-harmonic is counted, the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into;
Described normalization data table is: TABLEZ
m[]={ Z
m(2 π n/ (N-1)) }, wherein, m is the number of predetermined feature first-harmonic, Z
mBe m feature first-harmonic, n is a predetermined complete characterization first-harmonic envelope discrete point, n={0 ..., N-1};
Described amplitude data table is: TABLEV
r[]={ A* (r/R) }, r=R, R-1 ..., 2,1; R is the isodisperse that evenly is divided into predetermined amplitude A;
Frequency f according to described digital signal and described frequency schedule controlling features first-harmonic
i(t), according to the waveform shape Z of described digital signal and described normalization data table controlling features first-harmonic
m, and according to the amplitude V of described digital signal and described amplitude data table controlling features first-harmonic
r(t);
Utilize feature fundamental frequency f
i(t) and feature fundamental waveform Z
m, described digital signal is carried out frequency modulation and transferred shape, produce frequency modulation and transfer shape signal Z
M, f=∏ Z
m{ 2 π f
i(t) }; Wherein, ∏ represents from m feature first-harmonic Z
m{ 2 π f
i(t) } select one in;
Described frequency modulation is transferred shape signal Z
M, fThe digital signal of expressing is converted into analog signal;
According to feature amplitude of first harmonic V
r(t), described analog signal is carried out amplitude modulation(PAM), form modulated feature fundamental signal output; Described modulated feature fundamental signal u (t)=V
r(t) ∏ Z
m{ 2 π f
i(t) }.
Described method also comprises the step of modulated feature fundamental signal being carried out frequency modulation.
Described method also comprises, in the frequency f according to described Digital Signals feature first-harmonic
i(t), the waveform shape Z of controlling features first-harmonic
m, and the amplitude V of controlling features first-harmonic
r(t) before the operation, the digital signal of input is carried out grid coding.
Because scheme of the present invention adopts the coded modulation of digital signal being carried out simultaneously frequency modulation, amplitude modulation and accent shape 3 D stereo, coded modulation efficient height, can guarantee that communication data is in the digital communication of the enterprising line width band of narrow-band link, even the message capacity of channel is greatly improved, save utilization rate of network resource, and reduced the error rate of signal transmission.In the solution of the present invention, because digital information is to be modulated at simultaneously on the rate of change of the frequency deviation of carrier wave and frequency deviation, the amplitude of the frequency deviation of carrier wave and feature fundamental signal, the frequency of the rate of change of the frequency deviation of carrier wave and feature first-harmonic, relation is one to one arranged, so the signal antijamming capability is strong, the modulated feature fundamental signal distortion after the demodulation is little.
Description of drawings
The following drawings helps the detailed the present invention that understands, but only is to explain for example, should not be understood that limitation of the present invention.
Fig. 1 is first embodiment block diagram of device of the present invention;
Fig. 2 is the amplitude of four kinds of feature first-harmonics and the frequency three-dimensional constellation schematic diagram at system M=64;
Fig. 3 for the amplitude of four kinds of feature first-harmonics decompositing from Fig. 2 and frequency at the plane of system M=64 planisphere;
Fig. 4 is that the grid coding collection of Fig. 2 or Fig. 3 is divided figure;
Fig. 5 is second embodiment block diagram of device of the present invention;
Fig. 6 is the 3rd an embodiment block diagram of device of the present invention;
Fig. 7 is the 4th an embodiment block diagram of device of the present invention;
Fig. 8 is the 5th an embodiment block diagram of device of the present invention;
Fig. 9 is the 6th an embodiment block diagram of device of the present invention;
Figure 10 is the required discrete exemplary plot of counting of complete characterization first-harmonic envelope;
Figure 11 is the main flow chart of the method for the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in detail.Following explanation will help those skilled in the art better to understand other advantages of the present invention, purpose and feature.
At first introduce first embodiment of device of the present invention, with reference to figure 1.Digital signal encoding modulating device 1 shown in Figure 1, be used for needs are transmitted the coded modulation of carrying out of digital signal, its signal modulated process adopts frequency modulation, amplitude modulation and the modulation of accent shape 3 D stereo, thereby can greatly utilize the channel spectrum resource, improves channel capacity.This device 1 mainly comprises: feature fundamental frequency controller f
i(t) 13, feature fundamental waveform controller Z
m14, feature amplitude of first harmonic controller V
r(t) 15, and frequency and the controlled fundamental wave generator 16 of waveform, D/A converter 17 and buffering and gain controlled amplifier 18.The digital signal of considering the needs transmission that this digital signal encoding modulating device 1 receives in the practical application may be serial signal, therefore, also be provided with serial/parallel transducer 11 in the present embodiment, the serial digital signal that is used for transmitting is a parallel digital signal.In addition,, reduce the judgement error of each modulation point in the demodulating process, also be provided with trellis encoder 12 in the present embodiment, be used for the digital signal of input is carried out grid coding for making the coded modulation performance better.Like this, digital signal encoding modulating device 1 with the serial signal that receives after serial/parallel transducer 11 is converted to parallel digital signal, send into described trellis encoder 12, by parallel feature fundamental frequency controller f (t) 13, the feature fundamental waveform controller Z of sending into of the digital signal behind the grid coding
m14 and feature amplitude of first harmonic controller V (t) 15.
Now, in conjunction with Fig. 2, Fig. 3 device shown in Figure 1 is further elaborated.Fig. 2 is the amplitude of four kinds of feature first-harmonics and the frequency three-dimensional constellation schematic diagram at system M=64.According to planisphere shown in Figure 2, the number m of the feature first-harmonic that the digital signal modulation is adopted is 4 (value of m is by the precision and the error rate decisions of DSP or the distinguishable waveform of CPU).For convenient Fig. 3 is described, with Fig. 3 for the amplitude of four kinds of feature first-harmonics decompositing from Fig. 2 and frequency at the plane of system M=64 planisphere.Before carrying out coded modulation, determine similar planisphere shown in Figure 2 according to channel conditions.With Fig. 2,3 is example, at first determines the frequency (f1, the f2 shown in figure (3), the Frequency point of f3, f4) of all Frequency points of used feature first-harmonic, by actual available bandwidth and according to the resolution decision of channel bit error rate and DSP (or CPU); Again the feature first-harmonic in the one-period evenly is divided into N five equilibrium (value of N is by the frequency accuracy and the decision of DSP processing accuracy of feature first-harmonic), frequency according to set each Frequency point, set up the timetable of the T/N=1/fN that belongs to each Frequency point (f1, f2, f3, f4) respectively, i.e. TABLEf
i[]={ 1/f
1N, 1/f
2N, 1/f
3N, 1/f
4N}; Second, in order to reduce the operand of digital signal processor DSP (or CPU), improve coded modulation efficient, do not need above-mentioned N point all to calculate output, can be according to the sampling law, determine to constitute discrete counting (14 points for example shown in Figure 10: 0,3,6 that complete characterization first-harmonic envelope is required, 10,, 74,77,80), according to determined all discrete points, set up belong to m feature first-harmonic respectively (promptly scheme the Z0 shown in (3), Z1, Z2, four feature first-harmonics of Z3) the normalization data table of envelope value (being the value of the Zm (2 π n/ (N-1)) on the envelope), i.e. TABLEZ
m[]=0x0 ... Z
m(2 π n/ (N-1)) ... Z
m(2 π (N-1)/N) }; The 3rd, set up the tables of data of controlling features first-harmonic output amplitude, i.e. TABLEV
r[]={ A* (r/R) }, r=R ..., 2,1.Promptly amplitude A evenly is divided into R five equilibrium (value of R is by the judgement precision and the error rate decision of demodulation), because the amplitude that requires synchronously of code element can not be zero, general r gets 1 to R back 2/3 section, i.e. V
r(t) more than or equal to (1/3) A).
For the device among Fig. 1, described feature fundamental frequency controller f
i(t) 13, be used to store the frequency schedule of predetermined used all Frequency points of feature first-harmonic, according to the frequency of described digital signal and described frequency schedule controlling features first-harmonic; Described frequency schedule is: TABLEf
i[]={ 1/f
iN}, i={1 wherein, 2 ..., n}, n are that the frequency of predetermined used feature first-harmonic is counted, the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into.
Described feature fundamental waveform controller Z
m14, be used to store the normalization data table of the envelope value of used feature first-harmonic, according to the waveform shape of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table is: TABLEZ
m[]={ Z
m(2 π n/ (N-1)) }, wherein, m is the number of predetermined feature first-harmonic, Z
mBe m feature first-harmonic, n is a predetermined complete characterization first-harmonic envelope discrete point, n={0 ..., N-1}, in this example, n={0,3,6 ..., N-1}.
Described feature amplitude of first harmonic controller V
r(t) 15, be used to store used feature first harmonic magnitude tables of data, according to the amplitude of described digital signal and described amplitude data table controlling features first-harmonic; Described amplitude data table is: TABLEV
r[]={ A* (r/R) }, r=R, R-1 ..., 2,1; R is the isodisperse that evenly is divided into predetermined amplitude A.
The controlled fundamental wave generator 16 of frequency and waveform is at feature fundamental frequency controller f
i(t) and feature fundamental waveform controller Z
mControl under, produce frequency modulation and transfer shape signal Z
M, f=∏ Z
m{ 2 π f
i(t) }, produce the feature first-harmonic in single cycle; Wherein, ∏ represents from m feature first-harmonic Z
m{ 2 π f
i(t) } select one in.And D/A converter 17 is used for described frequency modulation is transferred shape signal Z
M, fThe numeral of expressing is converted into analog signal, by buffering and gain controlled amplifier 18, at feature amplitude of first harmonic controller V
r(t) under 15 the control, to the simulation Z of D/A converter output
M, fSignal carries out amplitude modulation(PAM), forms modulated feature fundamental signal output, finishes modulated process; Described modulated feature fundamental signal u (t)=V
r(t) ∏ Z
m{ 2 π f
i(t) }.
For above-mentioned modulated feature fundamental signal u (t)=V
r(t) ∏ Z
m{ 2 π f
i(t) }, ∏ Z
m{ 2 π f
i(t) }, m=0,1,2 ..., m, the meaning of ∏ is from m function Z
m{ 2 π f
i(t) } select one in, promptly synchronization has only a function Z
m{ 2 π f
i(t) } at work, V
r(t) be the function of feature amplitude of first harmonic, 2 π f
i(t) be the function of feature fundamental frequency, z
m{ 2 π f
i(t) } be wave function, when m=0, establish:
z
0{2πf
i(t)}＝sin{2πf
i(t)}；
Like this, by V
r(t), f
i(t) and z
m{ 2 π f
i(t) } three functions have constituted the 3-dimensional encoding modulation space of digital signal.
V
r(t)=A * (r/R), r=R, R-1 ..., 2,1; V
r(t) implication is: amplitude A evenly is divided into the R five equilibrium, V under the different cycles
r(t) get the value of different A * (r/R), V in one-period
r(t) value is constant.
f
i(t)=f
i* (n Δ t), i=1,2 ..., I, the implication of I is a selected I Frequency point; N=1,2 ..., N; Δ t=t
2-t
1t
1, t
2For being spaced apart 2 points of T/N on the time shaft.
Zm{2 π f
i(t) } in m is not equal to 0 function, its function principal character is the function (in this example adopt sinusoidal wave) approximate with SIN function, difference is that the zero crossing of function is not equal to π (duty ratio difference), but last half-wave is identical with the area of following half-wave, because the identical feature first-harmonic of area of last half-wave and following half-wave, its value of integration through one-period is zero, so do not contain flip-flop; We can establish half-wave and not belong to two sine waves that frequency is different with second wavelength-division, get respectively that half-wave and following half-wave partly become a feature first-harmonic on it.
In this example, the above feature first-harmonic is to be synthesized to come according to digital code information and D/A converter by DSP (or CPU) control frequency and the controlled fundamental wave generator 16 of waveform (the controlled fundamental wave generator 16 of frequency and waveform also can be realized by DSP or CPU).The following describes detailed building-up process.
Initialization timing device, timer counter variable n (n=0) and D/A converter are waited for write data signal, at write data signal then, parallel digital data are write feature fundamental frequency controller f
i(t) 12, feature fundamental waveform controller Z
m14, feature amplitude of first harmonic controller V
r(t) 15, clearing data then writes mark (suppose that this is labeled as fg_R, fg_R=0 then, 0 expression is removed, 1 reference numbers signal can write each control register).Utilize feature amplitude of first harmonic controller V again
r(t) 15, table look-up and determine the output amplitude of first-harmonic, utilize feature fundamental waveform controller Z
m14 TABLE that table look-up
Zm[]=0x0 ... Z
m(2 π n/ (N-1)) ... Zm (2 π (N-1)/, N) }, obtain the envelope data table that loads m feature first-harmonic, utilize feature fundamental frequency controller f
i(t) 12 table look-up and load the value (timing is T/N=1/fN) of timer, data then are set write mark, even fg_R=1, the notice input can be imported hypomere needs code modulated numerical data, enable timer, at timing then, carry out the operation of n=n+1, judge then whether n equals N-1, if not, (n circulates and equals the feature first-harmonic is carried out the scanning in a week week then to continue circulation, according to the different different envelope value of n output), otherwise loop ends, when loop ends finished, the synthetic processing of the one-period of feature first-harmonic finished promptly that (described feature first-harmonic is Zm (2 π f
i(t)) certain in), reinitialize the timer counter variable and make n=0, decapacitation timer (promptly allowing timer quit work); Load second section input data to V
r(t), f
i(t), Z
m, enable timer again, enter the processing of the next cycle of feature first-harmonic.
The above-mentioned feature fundamental waveform controller Z that utilizes
m14 table look-up, and select the envelope structure of different characteristic fundamental waveform, the envelope value of output characteristic first-harmonic, when n=0, table look-up the envelope data of m feature first-harmonic, send D/A converter, at this moment, data D=Z
m(2 π 0/N)=0; When n=3, table look-up the envelope data of m feature first-harmonic, send D/A converter, at this moment, data D=Z
m(2 π 3/N); When n=n, table look-up the envelope data of m feature first-harmonic, send D/A converter, at this moment, data D=Z
m(2 π n/ (N-1)); When n=N-1, table look-up the envelope data of m feature first-harmonic, send D/A converter, at this moment, data D=Z
m(2 π (N-1)/N).
At buffering and gain controlled amplifier unit, according to feature amplitude of first harmonic controller V
r(t) 15 data, TABLEV tables look-up
r[] determines the output amplitude of feature first-harmonic, finishes modulated feature first-harmonic output.
In a word, be depicted as the amplitude of four kinds of feature first-harmonics and frequency planisphere, M=V for figure (3) at system M=64
r(t) * f
i(t) * Z
m=4 * 4 * 4=64;
F wherein
1To f
4Be f
i(t) span, (under narrow-band FM FM uses, f
1Desirable 95%B/2, wherein B is a channel width), f
2=f
1* 1/ (1+ Δ t * f
1)), f
3=f
2* 1/ (1+ Δ t * f
2)), f
4=f
3* 1/ (1+ Δ t * f
3)); Δ t=1/f
2-1/f
1Value be that resolution according to the error rate and DSP (being CPU) decides, centre frequency is f
i(t)=(f
1+ f
4)/2.V
1To V
4Be V
r(t) span is because demodulation needs symbol synchronization, so establish V
1To V
4Be that 1 to 1/3 (normalization) level is evenly distributed.Z
mRegister value is: during Binary Zero 0, and Z
m=Z
0(2 π f
i(t))=sin (2 π f
i(t)); Z
mRegister value is: during Binary Zero 1, and Z
m(2 π f
i(t))=Z
1(2 π f
i(t)); Z
mRegister value is: during binary one 0, and Z
m(2 π f
i(t))=Z
2(2 π f
i(t)); Z
mRegister value is: during binary one 1, and Z
m(2 π f
i(t))=Z
3(2 π f
i(t)).
The grid coding collection that this example adopts is divided, and can make the coded modulation of overall digital signal reach good overall performance; Its basis is that the collection that Ungerboeck (1982) proposes is divided the mapping notion.Collection is divided the connection that mapping can be used for block code or convolution code.The basic principle of dividing the planed signal planisphere is that signal constellation which is divided into subclass one by one, and wherein each point is separated to greatest extent.From original signal constellation which, earlier it is divided into two subclass, requiring these two subclass is similar shapes, and wherein each point separates to greatest extent.Then, each subclass is repeated to divide in this wise, up to end, shown in figure (4); If the Z among the figure (3)
m(2 π f
iAnd V (t))
r(t) exchange, it is identical with figure (4) that its grid coding collection is divided.
Fig. 5 is second embodiment block diagram of device of the present invention, and it has described the application of modulated feature fundamental signal in arrowband FM modulation.The described device of this embodiment is on the basis of digital signal encoding modulating device shown in Figure 1, increased frequency modulator 2 again, be used for so just can utilizing the advantage of FM, increase the antijamming capability of modulation signals exporting behind modulated feature fundamental signal u (t) frequency modulation.Because the bandwidth of arrowband FM modulation is identical with the bandwidth of conventional AM signal, therefore, effectively feature fundamental frequency scope is smaller or equal to B/2 (B is the bandwidth of channel).Modulated feature fundamental signal is output as after through arrowband FM modulation:
u(t)＝Asin{2πf
ct+V
r(t)∏Z
m{2πf
i(t)}}；
Wherein: ∏ Z
m{ 2 π f
i(t) }, m=0,1,2 ..., m, the meaning of ∏ is from m function Z
m{ 2 π f
i(t) } select one in, promptly synchronization has only a function Z
m{ 2 π f
i(t) } in work.f
c, 2 π f
i(t) be the frequency of carrier wave and feature first-harmonic respectively, A, V
r(t) be the amplitude of carrier wave and feature fundamental signal respectively,
Because digital information is that the frequency deviation that is modulated at carrier wave simultaneously (is V
rAnd the rate of change of frequency deviation (i.e. 2 π f (t))
i(t)), the amplitude of the frequency deviation of carrier wave and feature fundamental signal, the frequency of the rate of change of the frequency deviation of carrier wave and feature first-harmonic has relation one to one, so the signal antijamming capability is strong, the modulated feature fundamental signal distortion after the demodulation is little.
Fig. 6 is the 3rd an embodiment block diagram of device of the present invention, and it has described the multiplexing broadband application of carrier wave quadrature two-way.The quadrature two paths of digital signals coded modulation device 3 that this embodiment describes based on digital signal encoding modulating device shown in Figure 1, comprise the first and second digital signal encoding modulating devices 31,32, also comprise first balanced modulator 33, second balanced modulator 34, comprehensive adder 37, and sine-wave generator 35 and phase shifter 36 that standard sine wave is provided.According to shown in Figure 6, sine-wave generator 35 directly connects described first balanced modulator 33, the sine wave of its output directly feeds first balanced modulator 33 like this, the sine wave of sine-wave generator 35 outputs makes the carrier wave of first balanced modulator 33, second balanced modulator 34 mutually orthogonal feeding second balanced modulator 34 through after-90 ° of phase shifts of phase shifter 36 like this.In actual applications, sine-wave generator 35 also can directly connect described second balanced modulator 34, the sine wave of its output directly feeds first balanced modulator 34 like this, and the sine wave of sine-wave generator 35 outputs equally also can realize making the carrier wave of first balanced modulator 33, second balanced modulator 34 mutually orthogonal through feeding first balanced modulator 33 after-90 ° of phase shifts of phase shifter 36.
Therefore, described first balanced modulator 33 is used for the first modulated feature fundamental signal and the sinusoidal carrier (cosine carrier) of the output of the first digital signal encoding modulating device are carried out the amplitude modulation modulation; Second balanced modulator is used for the second modulated feature fundamental signal and the cosine carrier (then being sinusoidal carrier by second kind of connected mode) of the output of the second digital signal encoding modulating device are carried out the amplitude modulation modulation; And comprehensive adder 37 is used for the modulation signal that synthetic first balanced modulator and second balanced modulator are exported, and forms the output of quadrature two road modulated carrier signals.
Therefore, among Fig. 6, the modulated feature first-harmonic of the two-way m of the first and second digital signal encoding modulating devices, 31,32 outputs
1(t) and m
2(t) respectively by balanced modulator, carry out the amplitude modulation modulation with sinusoidal wave carrier wave and cosine wave carrier wave respectively, then, and this two-way modulated carrier addition, the synthetic modulated feature first-harmonic of formation is:
u(t)＝Am
1(t)cos2πfct+Am
2(t)sin2πfct；
Wherein: m
1(t)=V
r(t) ∏ Z
m{ 2 π f
i(t) };
m
2(t)＝V
r(t)∏Z
m{2πf
i(t)}。
Carrier wave quadrature two-way shown in Figure 6 is multiplexing to be a communication system that bandwidth efficiency is very high, can be comparable with the bandwidth efficiency of monolateral band (SSB-AM) modulation.Its communication data rate R
bBe 6 to 12 times to frequency bandwidth B, i.e. R
b=Blog
2(M).
Fig. 7 is the 4th an embodiment block diagram of device of the present invention, and it has described the broadband application of multicarrier AM modulation.The device that Fig. 7 describes is based on the multiple carrier digital signal coded modulation device of quadrature two paths of digital signals coded modulation device, this device 4 comprises a plurality of (at least two) quadrature two paths of digital signals coded modulation device 41,42, also comprise multichannel adder 43, quadrature two road modulated carrier signals that are used for synthetic above-mentioned a plurality of quadrature two paths of digital signals coded modulation device outputs, the carrier wave of above-mentioned a plurality of quadrature two road modulated carrier signals is mutually orthogonal, form the modulated quadrature carrier signal output of multichannel quadrature, it is multicarrier AM modulation signal, be applicable to various broadband application occasions, as WLAN.
Fig. 8 is the 5th an embodiment block diagram of device of the present invention, the multiple carrier digital signal coded modulation device that is based on described digital signal encoding modulating device that this embodiment describes, this device 5 comprises a plurality of (at least two) digital signal encoding modulating device 51,52, also comprise multichannel adder 53, the modulated carrier signal that is used for synthetic above-mentioned at least two digital signal encoding modulating devices output forms the output of multichannel modulated carrier signal.The frequency of the carrier wave of the modulated carrier signal of above-mentioned a plurality of digital signal encoding modulating device outputs is (frequency spectrum is a quadrature) of staggering mutually.Multichannel modulated carrier herein is meant that (frequency spectrum the is a quadrature) mode that staggers mutually by frequency with multichannel " digital signal encoding modulating device " directly exports the modulated feature fundamental signal of multichannel synthetic of generation.
Fig. 9 is the 6th an embodiment block diagram of device of the present invention, and it has described the broadband application of another kind of multicarrier AM modulation.Device 6 shown in Figure 9 is based on quadrature two road multiple carrier digital signal coded modulation devices of described multiple carrier digital signal coded modulation device, this device 6 comprises the first and second multichannel modulated carrier digital signal encoding modulating devices 61,62, also comprise first balanced modulator 63, second balanced modulator 64, comprehensive adder 67, and sine-wave generator 65 and phase shifter 66 that standard sine wave is provided.According to shown in Figure 9, sine-wave generator 65 directly connects described first balanced modulator 63, the sine wave of its output directly feeds first balanced modulator 63 like this, the sine wave of sine-wave generator 65 outputs is feeding second balanced modulator 64 through after-90 ° of phase shifts of phase shifter 36, thereby makes the carrier wave of first balanced modulator 63, second balanced modulator 64 mutually orthogonal.
First balanced modulator is used for the first multichannel modulated carrier signal and the sinusoidal carrier of the output of the first multichannel modulated carrier digital signal encoding modulating device are carried out the amplitude modulation modulation;
Second balanced modulator is used for the second multichannel modulated carrier signal and the cosine carrier of the output of the second multichannel modulated carrier digital signal encoding modulating device are carried out the amplitude modulation modulation;
Comprehensive adder is used for the modulation signal that synthetic first balanced modulator and second balanced modulator are exported, and forms the output of quadrature two road multicarrier modulated signals.
It is to be noted, sine-wave generator 65 also can directly connect described second balanced modulator 64, the sine wave of its output directly feeds first balanced modulator 64 like this, and the sine wave of sine-wave generator 65 outputs is feeding first balanced modulator 63 through after-90 ° of phase shifts of phase shifter 66.
Device shown in Figure 9 is in same band width in physical B, and the first multiple carrier digital signal coded modulation device 61 synthesizes the I road m that frequency spectrum staggers mutually
i(t) feature first-harmonic, I road m
i(t) after the addition of orthogonal characteristic first-harmonic, obtain u
1(t); Use the same method and to obtain the u of the second multiple carrier digital signal coded modulation device, 62 outputs
2(t).u
1(t), u
2(t) respectively by balanced modulator, carry out the amplitude modulation modulation with sinusoidal wave carrier wave and cosine wave carrier wave respectively, then, this two-way modulated carrier addition obtains as shown in the formula described quadrature two road multiple carrier digital signal modulation signals:
u(t)＝Au
1(t)cos2πfct+Au
2(t)sin2πfct；
Wherein: u
1(t)=V
r(t) ∏ Z
m{ 2 π f
1(t) }+... + V
r(t) ∏ Z
m{ 2 π f
I(t) };
u
2(t)＝V
r(t)∏Z
m{2πf
1(t)}+…+V
r(t)∏Z
m{2πf
I(t)}。
This is the highest a kind of modulation scheme of single carrier bandwidth availability ratio, also is the higher a kind of scheme of bandwidth efficiency, its communication data rate R
bMay surpass shannon capacity C.
Figure 11 is the main flow chart of the method for the invention.The described digital signal modulating mehtod of Figure 11 is used for the coded modulation to digital signal, produces the described modulated feature fundamental signal of following formula:
u(t)＝V
r(t)∏Z
m{2πf
i(t)}；
Wherein: ∏ Z
m{ 2 π f
i(t) }, m=0,1,2 ..., m, the meaning of ∏ is from m function Z
m{ 2 π f
i(t) } select one in, promptly synchronization has only a function Z
m{ 2 π f
i(t) } at work, V
r(t) be the function of feature amplitude of first harmonic, 2 π f
i(t) be the function of feature fundamental frequency, Z
m{ 2 π f
i(t) } be
Wave function, when m=0, establish:
Z
0{2πf
i(t)}＝sin{2πf
i(t)}；
Like this, by V
r(t), f
i(t) and Z
m{ 2 π f
i(t) } three functions have constituted the 3-dimensional encoding modulation space of digital signal.
V
r(t)=A * (r/R), r=R, R-1 ..., 2,1; Be V
r(t) (because the amplitude that requires synchronously of code element can not be zero, general r gets 1 to R back 2/3 section, i.e. V to implication in order amplitude A evenly is divided into the R five equilibrium
r(t) more than or equal to (1/3) A), V under the different time cycles
r(t) get the value of different A * (r/R), V in one-period
r(t) value is constant.
f
i(t)=f
i* (n Δ t), i=1,2 ..., I, the implication of I is a selected I Frequency point; N=1,2 ..., N; Δ t=t
2-t
1t
1, t
2For being spaced apart 2 points of T/N on the time shaft.
Zm{2 π f
i(t) } in m is not equal to 0 function, its function principal character is the function approximate with SIN function, difference is that the zero crossing of function is not equal to π (duty ratio difference), but last half-wave is identical with the area of following half-wave, because the identical feature first-harmonic of area of last half-wave and following half-wave, its value of integration through one-period is zero, so do not contain flip-flop; We can establish half-wave and not belong to two sine waves that frequency is different with second wavelength-division, get respectively that half-wave and following half-wave partly become a feature first-harmonic on it.
According to Figure 11, the planisphere that need pre-determine the digital signal encoding modulation (can be according to the channel circumstance setting, as channel bit error rate and signal to noise ratio), promptly set up the normalization data table and the used feature first harmonic magnitude tables of data of the envelope value of the frequency schedule of used all Frequency points of feature first-harmonic, used feature first-harmonic, with as above-mentioned three-dimensional modulated control foundation.
Suppose planisphere such as Fig. 2 or shown in Figure 3, can determine above-mentioned three tables of data in such a way.At first, determine the frequency (i.e. f1, f2 shown in figure (3), the Frequency point of f3, f4) of all Frequency points of used feature first-harmonic, determine by actual available bandwidth; Again the feature first-harmonic in the one-period evenly is divided into the N five equilibrium,, sets up the timetable of the T/N=1/fN that belongs to each Frequency point (f1, f2, f3, f4) respectively, i.e. TABLEf according to the frequency of set each Frequency point
i[]={ 1/f
1N, 1/f
2N, 1/f
3N, 1/f
4N}; Second, in order to reduce the operand of DSP (CPU), do not need all output of N point, therefore, according to the sampling law, determine to constitute discrete the counting (for example 14 of Figure 10 points) that complete characterization first-harmonic envelope is required, according to determined all discrete points, set up belong to m feature first-harmonic respectively (promptly scheme the Z shown in (3)
0, Z1, Z2, four feature first-harmonics of Z3) the normalization data table of envelope value (being the value of the Zm (2 π n/ (N-1)) on the envelope), i.e. TABLEZ
m[]=0x0 ... Z
m(2 π n/ (N-1)) ... Z
m(2 π (N-1)/N) }; The 3rd, set up the tables of data of controlling features first-harmonic output amplitude, i.e. TABLEV
r[]={ A* (r/R) }, r=R, R-1 ..., 2,1, promptly amplitude A evenly is divided into the R five equilibrium.Like this, just can be according to the frequency f of described digital signal and described frequency schedule controlling features first-harmonic
i(t), according to the waveform shape Z of described digital signal and described normalization data table controlling features first-harmonic
m, and according to the amplitude V of described digital signal and described amplitude data table controlling features first-harmonic
r(t), thus realize the digital signal encoding modulation of the method for the invention.
When digital signal is imported, suppose that this signal is a serial digital signal, will this serial digital signal be converted to parallel digital signal in step 1, carry out grid coding at step 2 pair described parallel digital signal again, follow the data after step 3 utilization is carried out grid coding, the frequency f of controlling features first-harmonic
i(t), the waveform shape Zm of controlling features first-harmonic, and the amplitude V of controlling features first-harmonic
r(t).Specifically, this step is at first according to feature fundamental frequency f
i(t) and feature fundamental waveform Z
m, described digital signal is carried out frequency modulation and transferred shape, produce frequency modulation and transfer shape signal Z
M, f=∏ Z
m{ 2 π f
i(t) }; Wherein, ∏ represents from m feature first-harmonic Z
m{ 2 π f
i(t) } select one in; Again described frequency modulation is transferred shape signal Z
M, fThe digital signal of expressing is converted into analog signal; At last according to feature amplitude of first harmonic V
r(t), described analog signal is carried out amplitude modulation(PAM), form modulated feature fundamental signal output; Described modulated feature fundamental signal u (t)=V
r(t) ∏ Z
m{ 2 π f
i(t) }.
Above-mentioned steps 2,3 is specific implementation like this: initialization timing device, timer counter variable n (n=0) and D/A converter, wait for write data signal, at write data signal then, with the numerical data controlling features fundamental frequency f behind the grid coding
i(t), feature fundamental waveform Z
m, feature amplitude of first harmonic V
r(t), clear data then and write mark (suppose that this is labeled as fg_R, fg_R=0 then, 0 expression is removed, 1 reference numbers signal can write each control register).Utilize feature amplitude of first harmonic V again
r(t), table look-up and determine the output amplitude of first-harmonic, utilize feature fundamental waveform Z
mTABLEZ tables look-up
m[]=0x0 ... Z
m(2 π n/ (N-1)) ... Zm (2 π (N-1)/N) }, obtain the envelope data table that loads m feature first-harmonic, utilize feature fundamental frequency f
i(t) table look-up and load the value (timing is T/N=1/fN) of timer, data then are set write mark, even fg_R=1, can import hypomere needs code modulated numerical data; Enable timer, at timing then, carry out the operation of n=n+1, judge then whether n equals N-1, if not, (n circulates and equals the feature first-harmonic is carried out the scanning in a week week then to continue circulation, make that subprogram is according to the different different envelope value of n output), otherwise loop ends, when loop ends finished, the synthetic processing of the one-period of feature first-harmonic finished promptly that (described feature first-harmonic is Zm (2 π f
i(t)) certain in), reinitialize the timer counter variable and make n=0, decapacitation timer (promptly allowing timer quit work); Load second section input data to V
r(t), f
i(t), Z
m, enable timer again, enter the processing of the next cycle of feature first-harmonic.
Select the envelope structure of different characteristic fundamental waveform, the process of the envelope value of output characteristic first-harmonic can realize like this: suppose the required discrete point of determined feature first-harmonic envelope for 0,3 ..., n ..., N-1}, when n=0, TABLEZ tables look-up
m[] gets the envelope data of m feature first-harmonic, carries out the D/A conversion, at this moment data D=Z
m(2 π 0/N)=0; When n=3, TABLEZ tables look-up
m[] gets the envelope data of m feature first-harmonic, carries out the D/A conversion, at this moment D=Z
m(2 π 3/N); When n=n, TABLEZ tables look-up
m[] gets the envelope data of m feature first-harmonic, carries out the D/A conversion, at this moment D=Z
m(2 π n/ (N-1)); When n=N-1, table look-up the envelope data of m feature first-harmonic, carry out the D/A conversion, this moment D=Z
m(2 π (N-1)/N).
For the feature first-harmonic of one-period, TABLEV tables look-up
r[] determines the output amplitude of feature first-harmonic, finishes modulated feature first-harmonic output.
If the amplitude of four kinds of feature first-harmonics shown in the employing figure (3) and frequency are at the planisphere of system M=64, then M=V
r(t) * f
i(t) * z
m=4 * 4 * 4=64;
F wherein
1To f
4Be f
i(t) span, (under narrow-band FM FM uses, f
1Desirable 95%B/2, wherein B is a channel width), f
2=f
1* 1/ (1+ Δ t * f
1)), f
3=f
2* 1/ (1+ Δ t * f
2)), f
4=f
3* 1/ (1+ Δ t * f
3)); Δ t=1/f
2-1/f
1Value be that resolution according to the error rate and DSP (or CPU) decides, centre frequency is f
i(t)=(f
1+ f
4)/2.V
1To V
4Be V
r(t) span is because demodulation needs symbol synchronization, so establish V
1To V
4Be that 1 to 1/3 (normalization) level is evenly distributed.Z
mRegister value is: during Binary Zero 0, and Z
m=Z
0(2 π f
i(t))=sin (2 π f
i(t)); Z
mRegister value is: during Binary Zero 1, and Z
m(2 π f
i(t))=Z
1(2 π f
i(t)); Z
mRegister value is: during binary one 0, and Z
m(2 π f
i(t))=Z
2(2 π f
i(t)); Z
mRegister value is: during binary one 1, and Z
m(2 π f
i(t))=Z
3(2 π f
i(t)).
In the described method of Figure 11, can also comprise the step of modulated feature fundamental signal being carried out frequency modulation.Because the bandwidth of arrowband FM modulation is identical with the bandwidth of conventional AM signal, therefore, effectively feature fundamental frequency scope is smaller or equal to B/2 (B is the bandwidth of channel).Modulated feature fundamental signal in the expression formula of arrowband FM modulation is:
u(t)＝Asin{2πf
ct+V
r(t)∏Z
m{2πf
i(t)}}；
Wherein: ∏ Z
m{ 2 π f
i(t) }, m=0,1,2 ..., m, the meaning of ∏ is from m function Z
m{ 2 π f
i(t) } select one in, promptly synchronization has only a function Z
m{ 2 π f
i(t) } in work.f
c, 2 π f
i(t) be the frequency of carrier wave and feature first-harmonic respectively, A, V
r(t) be the amplitude of carrier wave and feature fundamental signal respectively.Owing to increased the step of frequency modulation, made modulated feature fundamental signal have stronger antijamming capability.
Need to prove that what the present invention adopted is frequency modulation, amplitude modulation, the three-dimensional modulation scheme of accent shape, in actual applications, adopts the two-dimensional modulation scheme of wherein any two combinations in frequency modulation, amplitude modulation, the accent shape also can improve code modulated efficient greatly.
Also need explanation, in the concrete enforcement of apparatus and method of the present invention, to indicate code modulated planisphere be according to the variation of channel circumstance and dynamic change, and the tables of data that is adopted changes also the time.For example, when lower and/or signal to noise ratio was higher in the error rate, the M value increased automatically, and number, the frequency that promptly can increase the feature first-harmonic are counted, or the like.
Claims (11)
1, a kind of digital signal encoding modulating device is used for the coded modulation to needs transmission digital signal, it is characterized in that, comprising:
Encoder be used for the encoding digital signals to input, and the digital signal after will encoding is sent into feature fundamental waveform controller Zm;
Feature fundamental waveform controller Zm is used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape of digital signal behind the described coding and described normalization data table controlling features first-harmonic; Described normalization data table is: TABLEZm[]={ Zm (2 π n/ (N-1)) }, wherein, m is the number of predetermined feature first-harmonic, and Zm is a m feature first-harmonic, and n is a predetermined complete characterization first-harmonic envelope discrete point, n={0 ..., N-1}; , the isodisperse of N for the feature first-harmonic in the one-period T evenly is divided into;
Feature amplitude of first harmonic controller V
r(t), be used to store used feature first harmonic magnitude tables of data,, form and transfer shape amplitude modulation feature fundamental signal u (t) output, described accent shape amplitude modulation feature fundamental signal u (t)=V according to the amplitude of described digital signal and described amplitude data table controlling features first-harmonic
r(t) * ∏ Zm (Ω t);
Feature fundamental frequency controller f
i(t), be used to store the frequency schedule of predetermined used all Frequency points of feature first-harmonic, according to the frequency of described digital signal and described frequency schedule controlling features first-harmonic; Described frequency schedule is: TABLEf
i[]={ 1/f
iN}, i={1 wherein, 2 ..., n}, n are that the frequency of predetermined used feature first-harmonic is counted, the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into;
The controlled fundamental wave generator of waveform under the control of feature fundamental waveform controller Zm, produces and transfers shape (modulation waveform) signal ∏ Zm=∏ Zm (n)=∏ Zm{2 π n/ (N-1) }.
2, digital signal encoding modulating device as claimed in claim 1 is characterized in that,
Described amplitude data table is: TABLEV
r[]={ A* (2r-1-R) }, r=R, R-1 ..., 2,1, R is the isodisperse that evenly is divided into predetermined amplitude; A is a peak factor;
Described V
r(t) be the function of feature carrier amplitude, V
r(t)={ A* (2r-1-R) }, r=R, R-1 ..., 2,1;
The controlled fundamental wave generator of waveform is output as:
u(t)＝∏Zm(n)＝∏Zm{2πn/(N-1)}＝∏Zm(Ωt)；
Wherein, ∏ represents to select one from m feature first-harmonic Zm (Ω t); Ω is the angular frequency of feature first-harmonic, Ω=2 π f=2 π/T; N is a predetermined feature first-harmonic envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature first-harmonic in the one-period T evenly is divided into.
3, a kind of digital signal encoding modulating device is used for the coded modulation to needs transmission digital signal, it is characterized in that, comprising:
Feature fundamental frequency controller f
i(t), be used to store the frequency schedule of predetermined used all Frequency points of feature first-harmonic, according to the frequency of described digital signal and described frequency schedule controlling features first-harmonic; Described frequency schedule is: TABLEf
i[]={ 1/f
iN}, i={1 wherein, 2 ..., n}, n are that the frequency of predetermined used feature first-harmonic is counted, the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into;
Feature fundamental waveform controller Z
m, be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table is: TABLEZ
m[]={ Z
m(2 π a/N) }, wherein, m is the number of predetermined feature first-harmonic, Z
mBe m feature first-harmonic, a is a predetermined complete characterization first-harmonic envelope discrete point, a={0 ..., N-1};
Feature amplitude of first harmonic controller V
r(t), be used to store used feature first harmonic magnitude tables of data, according to the amplitude of described digital signal and described amplitude data table controlling features first-harmonic; Described amplitude data table is:
TABLEV
r[]={ A* (r/R) }, r=R, R-1 ..., 2,1; R is the isodisperse that evenly is divided into predetermined amplitude A;
The controlled fundamental wave generator of frequency and waveform is at feature fundamental frequency controller f
i(t) and feature fundamental waveform controller Z
mControl under, produce frequency modulation and transfer shape signal Z
M, f=∏ Z
m{ 2 π f
i(t) }; Wherein, ∏ represents from m feature first-harmonic Z
m{ 2 π f
i(t) } select one in;
D/A converter is used for described frequency modulation is transferred shape signal Z
M, fThe digital signal of expressing is converted into analog signal;
Buffering and gain controlled amplifier are at feature amplitude of first harmonic controller V
r(t) under the control, to the simulation Z of D/A converter output
M, fSignal carries out amplitude modulation(PAM), forms modulated feature fundamental signal output; Described modulated feature fundamental signal u (t)=V
r(t) ∏ Z
m[2 π f
i(t) }.
4, as claim 1 or 2 or 3 described digital signal encoding modulating devices, it is characterized in that, described device also comprises trellis encoder, is used for the digital signal of input is carried out grid coding, and the parallel feature fundamental frequency controller f that sends into of the digital signal after will encoding
i(t), feature fundamental waveform controller Z
mWith feature amplitude of first harmonic controller V
r(t).
5, digital signal encoding modulating device as claimed in claim 4, it is characterized in that, described device also comprises deserializer, and the serial digital signal that is used for transmitting is a parallel digital signal, and the parallel digital signal after will changing is sent into described trellis encoder.
6, as claim 1,2 or 3 described digital signal encoding modulating devices, it is characterized in that described device also comprises frequency modulator, be used for and export behind modulated feature fundamental signal u (t) frequency modulation.
7, a kind of quadrature two paths of digital signals coded modulation device based on claim 1,2 or 3 described digital signal encoding modulating devices comprises the first and second digital signal encoding modulating devices, it is characterized in that also comprising:
First balanced modulator is used for the first modulated feature fundamental signal to first digital signal encoding modulating device output and carries out amplitude modulation with sinusoidal carrier or cosine carrier and modulate;
Second balanced modulator is used for the second modulated feature fundamental signal to second digital signal encoding modulating device output and carries out amplitude modulation with cosine carrier or sinusoidal carrier and modulate;
Comprehensive adder is used for the modulation signal that synthetic first balanced modulator and second balanced modulator are exported, and forms the output of quadrature two road modulated carrier signals.
8, as claim 1,2 or 3 described digital signal encoding modulating devices, it is characterized in that the waveform of described m feature first-harmonic has mutually different duty ratio.
9, a kind of digital signal modulating mehtod comprises:
Set up the normalization data table and the used feature first harmonic magnitude tables of data of the envelope value of the frequency schedule of used all Frequency points of feature first-harmonic, used feature first-harmonic;
Described frequency schedule is: TABLEf
i[]={ 1/f
iN}, i={1 wherein, 2 ..., n}, n are that the frequency of predetermined used feature first-harmonic is counted, the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into;
Described normalization data table is: TABLEZ
m[]={ Z
m(2 π n/ (N-1)) }, wherein, m is the number of predetermined feature first-harmonic, Z
mBe m feature first-harmonic, n is a predetermined complete characterization first-harmonic envelope discrete point, n={0 ..., N-1};
Described amplitude data table is: TABLEV
r[]={ A* (r/R) }, r=R, R-1 ..., 2,1; R is the isodisperse that evenly is divided into predetermined amplitude A;
Frequency f according to described digital signal and described frequency schedule controlling features first-harmonic
i(t), according to the waveform shape Z of described digital signal and described normalization data table controlling features first-harmonic
m, and according to the amplitude V of described digital signal and described amplitude data table controlling features first-harmonic
r(t);
Utilize feature fundamental frequency f
i(t) and feature fundamental waveform Z
m, described digital signal is carried out frequency modulation and transferred shape, produce frequency modulation and transfer shape signal Z
M, f=∏ Z
m{ 2 π f
i(t) }; Wherein, ∏ represents from m feature first-harmonic Z
m{ 2 π f
i(t) } select one in;
Described frequency modulation is transferred shape signal Z
M, fThe digital signal of expressing is converted into analog signal;
According to feature amplitude of first harmonic V
r(t), described analog signal is carried out amplitude modulation(PAM), form modulated feature fundamental signal output; Described modulated feature fundamental signal u (t)=V
r(t) ∏ Z
m{ 2 π f
i(t) }.
10, digital signal modulating mehtod as claimed in claim 9 is characterized in that, described method also comprises the step of modulated feature fundamental signal being carried out frequency modulation.
As claim 9 or 10 described digital signal modulating mehtods, it is characterized in that 11, described method also comprises, in the frequency f according to described Digital Signals feature first-harmonic
i(t), the waveform shape Z of controlling features first-harmonic
m, and the amplitude V of controlling features first-harmonic
r(t) before the operation, the digital signal of input is carried out grid coding.
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| US9109831B2 (en) | 2007-07-11 | 2015-08-18 | AIR LIQUIDE GLOBAL E&C SOLUTIONS US Inc. | Process and apparatus for the separation of a gaseous mixture |
| EP2530866B1 (en) | 2009-03-27 | 2017-07-26 | Sony Corporation | Division of bit streams to produce spatial paths for multicarrier transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121412A (en) * | 1989-01-03 | 1992-06-09 | Motorola, Inc. | All-digital quadrature modulator |
| US5146473A (en) * | 1989-08-14 | 1992-09-08 | International Mobile Machines Corporation | Subscriber unit for wireless digital subscriber communication system |
-
2003
- 2003-07-01 CN CN 03148201 patent/CN1259791C/en not_active Expired - Fee Related
- 2003-07-28 AU AU2003257775A patent/AU2003257775A1/en not_active Abandoned
- 2003-07-28 WO PCT/CN2003/000600 patent/WO2005004424A2/en active Application Filing
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|---|---|
| CN1469608A (en) | 2004-01-21 |
| AU2003257775A1 (en) | 2005-01-21 |
| WO2005004424A8 (en) | 2005-04-28 |
| WO2005004424A2 (en) | 2005-01-13 |
| WO2005004424A3 (en) | 2005-03-24 |
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