CN1642155A - Digital signal encoding modulation device and method thereof - Google Patents

Abstract

The invention discloses a digital signal encoding modulation device for four-dimensional encoding modulation of a digital signal to be transmitted, the device includes a characteristic carrier waveform generator Z[m](t), a characteristics carrier amplitude controller V[r](t); the characteristic carrier waveform generator further includes a characteristic fundamental waveform controller G[m](t), a characteristic fundamental waveform reciprocal-calculating controller G[m][-1](t), a raised cosine carrier generator Rcos(omega t) and a synthesized synchronous multiplier; wherein the characteristic carrier waveform generator generates a unipolar raised cosine shaped carrier signal, an amplitude of a characteristic carrier is controlled by the characteristics carrier amplitude controller V[r](t) to form a shape-amplitude modulation characteristic carrier signal u(t) and output the signal. The invention also discloses a digital signal encoding modulation method.

Description

A kind of digital signal encoding modulating device and code modulating method

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 code modulating method.

Background technology

In digital signal transmission,, send (or storage) usually at signal and modulate before in order to improve the efficient and the reliability of signal transmission.Digital signal modulation is exactly the process that digital signal conversion is become to be adapted at the signal of transmission in the communication channel (or be transformed into be adapted at storing in the physical medium).Under the nervous condition of limited of radio spectrum resources (or in limited physical medium), people expect to adopt suitable signal modulation system usually, improve the signal transfer rate of channel, with in band-limited channel (or in limited physical medium, storing) more information.

For the digital signal that will transmit, digital signal need be modulated on radio frequency (RF) carrier wave usually and could send.Described RF carriers carry the digital information that need to transmit.Because it is sinusoidal wave that the RF carrier wave 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, be capacity thereby improve utilization rate of channel resources.

For achieving the above object, the encoding digital signals modulated digital signal coded modulation device that is used for the needs transmission provided by the invention comprises:

Feature carrier waveform generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), the feature fundamental waveform is asked the G of falling the controller _m ^-1(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described feature fundamental waveform is asked the G of falling the controller _m ^-1(t), be used for from described feature fundamental waveform controller G _m(t) obtain described normalization data table, should show data and get the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], described TABLEG _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and asks the G of falling the controller from the feature fundamental waveform _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and the table of falling normalization data TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

u(t)＝ΨZ _m(n)＝ΨZ _m(ωt)；

Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data,, form and transfer shape amplitude modulation feature carrier signal u (t) output, described accent shape amplitude modulation feature carrier signal u (t)=V according to the amplitude of described digital signal and described amplitude data table controlling features carrier wave _r(t) * Ψ Z _m(ω t);

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.

Described device also comprises:

Trellis encoder is used for the digital signal of input is carried out grid coding, and the parallel feature fundamental waveform controller G that sends into of the digital signal after will encoding _m(t) and feature carrier amplitude 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.

The quadrature two paths of digital signals coded modulation device based on above-mentioned digital signal encoding modulating device that the present invention provides simultaneously comprises the first and second digital signal encoding modulating devices, also comprises:

-90 ° of phase shifters are used for the second feature carrier signal of second digital signal encoding modulating device output is carried out-90 ° of phase shifts;

Comprehensive adder is used for first of synthetic first digital signal encoding modulating device output and transfers second of shape amplitude modulation feature carrier signal and-90 ° of phase shifter outputs to transfer shape amplitude modulation feature carrier signal, forms quadrature two tunnel modulated feature carrier signal outputs.

The carrier wave quadrature digital signal coded modulation device that the present invention provides simultaneously based on above-mentioned digital signal encoding modulating device, comprise the first and second digital signal encoding modulating devices, also comprise: the digital signal after will encoding is divided four tunnel parallel first (I), second (Q) feature carrier waveform generator Z of sending into _m(t) and first (I), second (Q) feature carrier amplitude controller V _r(t); It is characterized in that also comprising:

First balanced modulator is used for that the first modulated digital signal of described first digital signal encoding modulating device output is carried out balanced amplitude modulation with sinusoidal carrier or cosine carrier and modulates;

Second balanced modulator is used for that the second modulated digital signal of described second digital signal encoding modulating device output is carried out balanced amplitude modulation with cosine carrier or sinusoidal carrier and modulates;

Comprehensive adder is used for the modulation signal that synthetic first balanced modulator and second balanced modulator are exported, and forms quadrature modulated carrier signal (QWAM) output:

U(t)＝V _rI(t)×ΨZ _mI(ωt)cos(ω _ct)+V _rQ(t)×ΨZ _mQ(ωt)sin(ω _ct)；

Wherein, Ψ represents from m feature carrier wave Z _mSelect one in (ω t), ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into.

The multi-carrier orthogonal digital signal encoding modulating device based on above-mentioned carrier wave quadrature digital signal coded modulation device that the present invention provides simultaneously comprises at least two quadrature digital signal coded modulation devices, also comprises:

The multichannel adder is used for the quadrature modulated carrier signal that synthetic above-mentioned at least two quadrature digital signal coded modulation devices are exported, and forms multichannel time-frequency domain equal quadrature modulated carrier signal (OFDM) output.

The invention provides another kind of digital signal encoding modulating device, comprising:

Feature carrier waveform generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and from feature fundamental waveform controller G _m(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and normalization data table TABLE G _m[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

u(t)＝ΨZ _m(n)＝ΨZ _m(ωt)；

Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data,, form and transfer shape amplitude modulation feature carrier signal u (t) output, described accent shape amplitude modulation feature carrier signal u (t)=V according to the amplitude of described digital signal and described amplitude data table controlling features carrier wave _r(t) * Ψ Z _m(ω t);

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.

The third digital signal encoding modulating device provided by the invention comprises:

Feature carrier wave shape generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), on-off controller, feature fundamental waveform are asked the G of falling the controller _m ^-1(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described feature fundamental waveform is asked the G of falling the controller _m ^-1(t), be used for from described feature fundamental waveform controller G _m(t) obtain described normalization data table, should show data and get the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], described TABLEG _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described on-off controller is when m＞k, with described feature fundamental waveform controller G _mThe feature first-harmonic data of output (t) are input to described comprehensive synchronous multiplier, when m＜=k, described feature fundamental waveform are asked the G of falling the controller _m ^-1(t) output characteristic first-harmonic data are input to described comprehensive synchronous multiplier, and wherein k is the k of m feature first-harmonic;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and from feature fundamental waveform controller G _m(t) or from the feature fundamental waveform ask the G of falling the controller _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and normalization data table TABLE G _m[] or the table of falling normalization data TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) * G _m(n) } or={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

U (t)=Ψ Z _m(n)=Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data,, form and transfer shape amplitude modulation feature carrier signal u (t) output, described accent shape amplitude modulation feature carrier signal u (t)=V according to the amplitude of described digital signal and described amplitude data table controlling features carrier wave _r(t) * Ψ Z _m(ω t);

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.

The 4th kind of digital signal encoding modulating device provided by the invention comprises:

Feature carrier waveform generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), the feature fundamental waveform is asked the G of falling the controller _m ^-1(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described feature fundamental waveform is asked the G of falling the controller _m ^-1(t), be used for from described feature fundamental waveform controller G _m(t) obtain described normalization data table, should show data and get the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], described TABLEG _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and asks the G of falling the controller from the feature fundamental waveform _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and the table of falling normalization data TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) } and output characteristic carrier wave 0 Wave data signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

U (t)=Ψ Z _m(n)=Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier wave polarity controller P[], be used to control unipolar raised cosine and become bipolarity raised cosine feature carrier wave; Make that simultaneously the feature carriers rate is constant, make that again the feature carrier frequency is original 1/2nd; Described feature carrier wave polarity (polarity) controller P[] be output as:

U (t)=P (t) * Ψ Z _m(ω t)=0.5 (1-cos (ω t))/Ψ G _m(t), when t=2iT;

U (t)=P (t) * Ψ Z _m(ω t)=0.5 (cos (ω t)-1)/Ψ G _m(t), when t=(2i+1) T;

$P\left(t\right)=\left\{\begin{array}{cc}1& t=2\mathrm{iT}\\ -1& t=(2i+1)T\end{array}\right.;$

Wherein i=0,1,2, Ψ represents from m feature carrier wave Z _m(ω t) or G _m(t) select one in;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data, amplitude according to described digital signal and described amplitude data table control bipolarity raised cosine feature carrier wave forms and transfers shape amplitude modulation feature carrier signal U (t) output, described accent shape amplitude modulation feature carrier signal U (t)=V _r(t) * P (t) * Ψ Z _m(ω t);

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.

Digital signal modulating mehtod provided by the invention comprises:

Set up the normalization data table, the tables of data of controlling features carrier amplitude of envelope value of normalization data table, raised cosine Rcos (ω t) carrier wave of the frequency time value table of used feature first-harmonic, used feature first-harmonic envelope value;

Described frequency time value table is: TABLEf[]=1/ (fN)=T/N, wherein: the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into;

The normalization data table of described feature first-harmonic envelope value is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature carrier wave, G _mBe m feature first-harmonic, 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;

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;

The normalization data table of described raised cosine Rcos (ω t) carrier envelope value is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, described raised cosine carrier wave and feature first-harmonic are with the frequency homophase;

The normalization data table of described feature first-harmonic envelope value is got the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], and output characteristic fundamental waveform data;

Described TABLE G _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

The digital signal that input will be encoded is obtained raised cosine carrier waveform data, multiplies each other promptly described normalization data table TABLERcos[with described feature fundamental waveform data sync] and TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[], described TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) }, and output transfer shape carrier signal u (t);

U (t)=Ψ Z _m(n)=Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T;

Wherein, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}; The isodisperse of N for the feature carrier wave in the one-period T evenly is divided into:

According to the frequency f of described digital signal and described frequency time value table controlling features first-harmonic and feature carrier wave, according to the waveform shape Z of described digital signal and described feature carrier wave normalization data table controlling features carrier wave _m, and according to the amplitude V of described digital signal and described amplitude data table controlling features carrier wave _r(t);

According to the tables of data of controlling features carrier amplitude, described digital analogue signal u (t) is carried out amplitude modulation(PAM), form and transfer shape amplitude modulation feature carrier signal output u (t); Described accent shape amplitude modulation feature carrier signal u (t) is:

u(t)＝V _X(t)×ΨZ _m(n)＝V _r(t)×ΨZ _X(ωt)。

Described method also comprises the step of two tunnel modulated feature carrier signals being carried out the carrier wave quadrature modulation, and this step is:

Adopt sine and cosine carrier respectively the described the first and second tunnel modulated feature carrier signals to be multiplied each other, export the modulated carrier signal of two road carrier wave quadratures, the first via and the second road modulated carrier signal are carried out addition, output orthogonal modulated carrier signal:

U(t)＝V _rI(t)×ΨZ _mI(ωt)cos(ω _ct)+V _rQ(t)×ΨZ _mQ(ωt)sin(ω _ct)；

Wherein, Ψ represents from m feature carrier wave Z _mSelect one in (ω t), ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into.

Described method also comprises: at the waveform shape Z according to described Digital Signals feature carrier wave _m, and the amplitude V of controlling features carrier wave _r(t) before the operation, the digital signal of input is carried out grid coding.

The wave function G of described feature first-harmonic _m(n) or feature carrier wave Z _m(n) by the one or more symmetries of carrying out as minor function are intercepted acquisition:

1. Gauss (guass) window function;

$w\left(n\right)=e^{(-{(n-(N-1)/2)}^2.)/(2*{\mathrm{alpha}}^2);}(n=0,\·\·\·,N-1)$

2. breathe out bright (Hamming) window function;

w(n)＝0.54-0.46cos(2πn/(N-1))；(n＝0，…，N-1)

3. Rec graceful (Blackman) window function not;

w(n)＝0.42-0.5cos(2πn/(N-1))；(n＝0，…，N-1)

4. Blackman_Harris window function;

w(n)＝0.35875-0.48829cos(2πn/N)+0.14128cos(4πn/N)；

(n＝0，…，N-1)

5. Kai Ze (Kaiser) window function;

$w\left(n\right)=I_0{\[\mathrm{\ω}}_a\sqrt{{((N-1)/2)}^2-{\[n-(N-1)/2\]}^2}\]/I_0\[{\mathrm{\ω}}_a((N-1)/2\];$

$I_0=\underset{k=0}{\overset{\∞}{\mathrm{\Σ}}}{\[{(n/2)}^k/k!\]}^2;$

I in the formula ₀Be Bezier (Bessel) function of first kind correction, (n=0 ..., N-1); 1＜ω _a((N-1)/2)＜9.

6. rectangular window function;

$w\left(n\right)=\left\{\begin{array}{cc}1& 0<=n<=N-1\\ 0& \end{array}\right.;$

7. self-defined window function 1:

$w\left(t\right)=\left\{\begin{array}{cc}(1-\cos (2\mathrm{\&pi;fat}\left)\right)/2& 0<=2\mathrm{\&pi;fat}<=\mathrm{\&pi;}\\ (1-\cos (2\mathrm{\&pi;fbt}\left)\right)/2& \mathrm{\&pi;}<=2\mathrm{\&pi;fbt}<=2\mathrm{\&pi;}\end{array}\right.;$

f＝2fa*fb/(fa+fb)；

8. self-defined window function 2:

$w\left(n\right)=\left\{\begin{array}{cc}{e}^{(-{(n-(N-1)3/8)}^2.)/\left({2*\mathrm{alpha}}^2\right)}& 0<=n<=(N-1)3/4\\ e^{(-{(n-(N-1)3/8)}^2.)/\left({2*\mathrm{alpha}}^2\right)}& (N-1)/4<=n<=N-1\end{array}\right..$

In other embodiments of the invention, at controlling features carrier amplitude V _r(t) tables of data TABLEV _rAmong []={ A* (2r-1-R) }, the data of decision feature carrier waveform positive-negative polarity, be not used in transmission information but force it to equal 010101 ..., also promptly even number (or odd number) cycle of the feature carrier waveform of feasible output is that positive polarity, odd number (or even number) cycle are consequent pole.

In other embodiments of the invention, described feature carrier generator is based on the digital worry of the m group ripple device that the described window function of claim 13 is formed, and the sign indicating number control bipolar code of being exported by encoder flows to into m worry ripple device, generation feature carrier wave.

Owing to of the present inventionly digital signal carried out code modulated scheme be based upon on a plurality of different carrier waves, and on single-channel carrier, carry out positive intermodulation shape of multichannel and amplitude modulation simultaneously, thereby make the coded modulation scheme of the multi-C stereo that forms for institute's modulated digital signal have higher coded modulation efficient, can guarantee that communication data is in the digital communication of the enterprising line width band of narrow-band link, the message capacity of channel is greatly improved, save Internet resources and improved utilance, and reduced the error rate of signal transmission.

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 that feature carrier wave of the present invention is transferred shape amplitude-moulated digital signal coded modulation device embodiment block diagram;

Fig. 2 is quadrature two tunnel feature carrier wave digital signal encoding modulating device embodiment block diagrams based on the described device of Fig. 1 of the present invention;

Fig. 3 is the carrier wave quadrature digital signal coded modulation device embodiment block diagram based on the described device of Fig. 1 of the present invention;

Fig. 4 is the multi-carrier orthogonal digital signal encoding modulating device embodiment block diagram based on the described device of Fig. 3 of the present invention;

Fig. 5 and Fig. 6 form the constellation schematic diagram of four-dimensional system M=(8 * 8) * (8 * 8)=4096;

The waveform of four kinds of feature first-harmonics of Fig. 7 and amplitude are at the constellation schematic diagram of system M=16;

Fig. 8 is that the grid coding collection of Fig. 7 is divided figure;

Fig. 9 is the main flow chart of the method for the invention;

Figure 10 is the required discrete exemplary plot of counting of complete characterization first-harmonic envelope;

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.Feature carrier wave shown in Figure 1 is transferred shape amplitude-moulated digital signal coded modulation device (WAM) 1, the encoding digital signals that is used for needs are transmitted is modulated, its signal modulated process adopts amplitude modulation and transfers the shape two-dimensional modulation, thereby can greatly utilize the channel spectrum resource, improves channel capacity.This device 1 mainly comprises: feature carrier waveform generator Z _m10, feature carrier amplitude controller V _r(t) 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 transfers parallel digital signal to.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 after serial/parallel transducer 11 is converted to parallel digital signal, is sent into described trellis encoder 12 with the serial signal that receives, by the parallel feature carrier waveform generator Z that sends into of the digital signal behind the grid coding _m10 and feature carrier amplitude controller V _r(t) 17.

Device 10, i.e. feature carrier waveform generator Z _m, mainly comprise: feature fundamental waveform controller G _m(t) 13, raised cosine Rcos (ω t) carrier generator 15 (produce with feature first-harmonic with the carrier wave of homophase frequently), comprehensive synchronous multiplier 16 and to the G of falling the controller that asks of feature fundamental waveform data _m ^-1(t) 14.By the parallel feature fundamental waveform controller G that sends into of the digital signal behind the grid coding _m(t) 13, produce the G of falling the controller that asks that feature fundamental waveform data input to feature fundamental waveform data _m ^-1(t) 14, comprehensive synchronous multiplier is asked the G of falling the controller to the raised cosine carrier data and the feature first-harmonic of 15 inputs of raised cosine Rcos (ω t) carrier generator _m ^-1(t) data sync of 14 inputs multiplies each other, and the storage of acquisition is at feature carrier waveform generator Z _mOr in the comprehensive synchronous multiplier.

In actual realization the of the present invention, described feature carrier waveform generator Z _mFeature fundamental waveform controller G _m(t) 13, reach the G of falling the controller that asks to feature fundamental waveform data _m ^-1(t) 14, raised cosine Rcos (ω t) carrier generator 15 and comprehensive synchronous multiplier 16 etc., can finish by computer simulation, the m kind feature carrier data table that will simulate generation then directly deposits feature carrier waveform generator Z in _mIn; Digital signal is input to feature carrier waveform generator Z after encoding through trellis encoder _mIn, can be from feature carrier waveform generator Z _mShape carrier signal u (t)=Ψ Z is transferred in middle output _m(n)=Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T.

Now, in conjunction with Fig. 7 device shown in Figure 1 is further elaborated.Fig. 7 is the shape of four kinds of feature first-harmonics and the amplitude constellation schematic diagram at system M=16.According to planisphere shown in Figure 7, 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).Before carrying out coded modulation, determine similar planisphere shown in Figure 7 according to channel conditions.With Fig. 7 is example, at first determines the frequency f (by the transfer bandwidth decision) of the Frequency point of used feature first-harmonic; Again the feature first-harmonic in the one-period evenly is divided into N five equilibrium (value of N is by the accuracy of waveform and the decision of DSP processing accuracy of feature first-harmonic), frequency according to set Frequency point, set up the time value table of the T/N=1/ (fN) of Frequency point (f), i.e. TABLEf[]=1/ (fN); The 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 determine to constitute discrete points N (14 points for example shown in Figure 10: 0 that complete characterization first-harmonic envelope is required according to the sampling law, 3,6,10,74,77,80), according to determined all discrete point N, what foundation belonged to m feature first-harmonic respectively (is G shown in Figure 7 ₁, G ₂, G ₃, G ₄Four feature first-harmonics) envelope value (is the G on the envelope _m(n) normalization data table value), i.e. TABLEG _m[]={ G _m(n) }; The 3rd, set up the tables of data of controlling features carrier wave output amplitude, i.e. TABLEV _r[]={ A* (2r-1-R) }, r=R ..., 2,1.Promptly amplitude evenly is divided into R five equilibrium (value of R is by the judgement precision and the error rate decision of demodulation).

For the device among Fig. 1, described feature fundamental waveform controller G _m(t) 13, 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: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic, G _mBe m feature first-harmonic, n is a predetermined feature first-harmonic envelope discrete point, n={0 ..., N-1}.

The feature fundamental waveform is asked the G of falling the controller _m ^-1(t) 14, described normalization data table is got the TABLE of acquisition G reciprocal _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

Raised cosine carrier generator Rcos (ω t) is (with G _m(t) with homophase frequently), be used to store the normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape of described normalization data table control raised cosine carrier wave; Described normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, n is a predetermined raised cosine carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into.

Comprehensive synchronous multiplier is the raised cosine carrier data of raised cosine Rcos (ω t) carrier generator 15 inputs, and asks the G of falling the controller from the feature fundamental waveform _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described normalization data table TABLERcos[] and TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) }; Wherein, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}.

Feature carrier wave normalization data table TABLEZ _m[] is stored in feature carrier waveform generator Z _mOr in the comprehensive synchronous multiplier.

Described feature carrier waveform generator Z _mAccording to the data of trellis encoder input, export described accent shape carrier signal:

u(t)＝ΨZ _m(n)＝ΨZ _m(ωt)；

Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T;

Described feature carrier amplitude controller V _r(t) 17, be used to store used feature carrier amplitude tables of data, according to the amplitude of described digital signal and described amplitude data table controlling features carrier wave; 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.

Described accent shape signal Ψ Z _m(n) (=Ψ Z _m(ω t)) digital signal expressed is digital analogue signal;

According to the frequency f of described frequency time value table controlling features first-harmonic and feature carrier wave, according to the waveform shape Z of the normalization data table controlling features carrier wave of described digital signal and described feature carrier envelope value _m, and according to the amplitude V of described digital signal and described amplitude data table controlling features carrier wave _r(t).

Feature carrier amplitude controller V _r(t) 17, be used to store used feature carrier amplitude tables of data, according to described digital signal and described amplitude data table described digital analogue signal is carried out amplitude modulation(PAM), form and transfer the output of shape amplitude modulation feature carrier signal, finish modulated process; Described accent shape amplitude modulation feature carrier signal is:

u(t)＝V _r(t)×ΨZ _m(n)＝V _r(t)×ΨZ _m(ωt)；

Wherein: Ψ represents from m feature carrier wave Z _mSelect one in (ω t);

In this example, the above feature carrier wave also can be to come synthetic the realization by DSP (or CPU) according to digital code information controlling features carrier generator 10 (feature carrier generator 10 also can be realized by DSP or CPU).The following describes detailed building-up process.

Initialization timing device and timer counter variable n (n=0), (timing is T/N=1/ (fN) to the value of loading timer, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into), wait for write data signal, at write data signal then, parallel digital data is write feature carrier waveform controller Z _mIn 10, feature carrier amplitude controller V _r(t) 18, determine to load m carrier waveform tables of data and r kind carrier amplitude data, clearing data then writes mark (suppose that this is labeled as fg_R, fg_R=0 then, 0 expression removing, 1 reference numbers signal can write each control register).Utilize feature carrier waveform controller Z _m10 TABLEZ that table look-up _m[]={ Z _m(n) }, obtain the numerical value of m feature carrier envelope tables of data of loading, utilize feature carrier amplitude controller V again _r(t) 18, table look-up and determine the output amplitude of carrier wave, 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, then continue circulation (n circulates and equals the feature carrier wave is carried out the scanning in a week week, 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 carrier wave finished promptly that (described feature carrier wave is Z _m(n) certain in), reinitialize the timer counter variable and make n=0, decapacitation timer (promptly allowing timer quit work); Load second section input data to Z _m, V _r(t) ..., enable timer again, enter the processing of the next cycle of feature carrier wave.

The above-mentioned feature carrier waveform generator Z that utilizes _m10 table look-up, and select the envelope structure of different characteristic carrier waveform, the envelope value of output characteristic carrier wave, when n=0, table look-up the envelope data of m feature carrier wave, send output buffer, at this moment, data D=Z _m(0); When n=a, table look-up the envelope data of m feature carrier wave, send output buffer, at this moment, data D=Z _m(a); When n=N 1, table look-up the envelope data of m feature carrier wave, send output buffer, at this moment, data D=Z _m(N-1); Obtain from output buffer:

u(t)＝ΨZ _m(ωt)＝0.5(1-cos(ωt))/ΨG _m(t)；

At feature carrier amplitude controller unit, according to feature carrier amplitude controller V _r(t) 17 data, TABLEV tables look-up _r[] determines the output amplitude of feature carrier wave, finishes modulated feature carrier wave output: u (t)=V _r(t) * Ψ Z _m(ω t).

In a word, for the amplitude that Figure 7 shows that four kinds of feature first-harmonics and waveform planisphere, M=V at system M=16 _r(t) * G _m=4 * 4=16; Wherein: V ₁To V ₄Be V _r(t) span; G ₁To G ₄Be G _m(t) span;

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, as shown in Figure 8.

In other embodiments of the invention, can the cancellation feature fundamental waveform ask the G of falling the controller according to synthetic feature carrier spectrum and feature first-harmonic character _m ^-1(t), directly obtain feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) * G _m(n) }.In this example, described comprehensive synchronous multiplier is described raised cosine carrier waveform data, and from feature fundamental waveform controller G _m(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and normalization data table TABLE G _m[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) * G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal: u (t)=V _r(t) * Ψ Z _m(ω t).

Further, in other embodiments of the invention, can in described feature carrier waveform generator, increase an on-off controller.Described on-off controller is subjected to the control of trellis encoder, when m＞k, with described feature fundamental waveform controller G _mThe feature first-harmonic data of output (t) are input to described comprehensive synchronous multiplier, when m＜=k, described feature fundamental waveform are asked the G of falling the controller _m ^-1(t) output characteristic first-harmonic data are input to described comprehensive synchronous multiplier, and wherein k is the k of m first-harmonic.In this example, described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and from feature fundamental waveform controller G _m(t) or from the feature fundamental waveform ask the G of falling the controller _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and normalization data table TABLE G _m[] or the table of falling normalization data TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) * G _m(n) } or={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal:

u(t)＝V _r(t)×ΨZ _m(ωt)。

Further again, in other embodiments of the invention, can increase a feature carrier wave polarity controller P[at described feature carrier waveform generator output end], be used to control unipolar raised cosine and become bipolarity raised cosine feature carrier wave; Make that simultaneously feature carrier information speed is constant, make that again the frequency of feature carrier wave is original 1/2nd; Described feature carrier wave polarity (polarity) controller P[] be output as:

u(t)＝V _r(t)×P(t)×ΨZ _m(ωt)＝V _r(t)×0.5(1-cos(ωt))/ΨG _m(t)，

When t=2iT;

u(t)＝V _r(t)×P(t)×ΨZ _m(ωt)＝V _r(t)×0.5(cos(ωt)-1)/ΨG _m(t)，

When t=(2i+1) T;

$P$ $\left(t\right)=\left\{\begin{array}{cc}1& t=2\mathrm{iT}\\ -1& t=(2i+1)T\end{array}\right.;$

Wherein i=0,1,2, Ψ represents from m feature carrier wave Z _m(ω t) or G _m(t) select one in;

Fig. 2 is quadrature two tunnel feature carrier wave digital signal encoding modulating device embodiment block diagrams based on the described device of Fig. 1 of the present invention, and it has described the application of synthetic one tunnel orthogonal characteristic carrier waves of two tunnel modulated feature carrier signals.The described device 2 of this embodiment comprises the first numerical signal coded modulation device 21, second value signal encoding modulating device 22 and (90 °) phase-shifter 23 and comprehensive adder 24, promptly on the basis of digital signal encoding modulating device shown in Figure 1, (90 °) phase-shifter and comprehensive adder have been increased again, be used for the synthetic back output of the modulated feature carrier signal of Jiang Erlu u (t) quadrature, such advantage can make full use of the channel spectrum resource exactly, increases the transmission capacity of channel.Modulated orthogonal characteristic carrier signal is:

U(ωt)＝V _r1(t)ΨZ _m1(ωt)+V _r2(t)ΨZ _m2(ωt-π/2)；

Wherein: m=0,1,2 ..., M; Ψ represents from M feature carrier wave Z _M1(ω t) and Z _M2Select one in (ω t-pi/2); Be that synchronization has only a function Z _M1(ω t) and Z _M2(ω t-pi/2) is simultaneously in work; V _R1(t), V _R2(t) be the amplitude of modulated feature carrier signal respectively.

Fig. 3 is carrier wave quadrature digital signal coded modulation device (QWAM) the embodiment block diagram based on the described device of Fig. 1 of the present invention, and it has described the multiplexing broadband application of carrier wave quadrature two-way.The carrier wave 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, wherein shared grid coding device 12 and serial/parallel conversion equipment 11 stream oriented devices, also comprise first balanced modulator 35, second balanced modulator 33, comprehensive adder 37, and cosine wave generator 36 and (90 °) phase shifter 34 that the standard cosine wave is provided.According to shown in Figure 3, cosine wave generator 36 directly connects described first balanced modulator 35, the cosine wave of its output directly feeds first balanced modulator 35 like this, the cosine wave of cosine wave generator 36 outputs makes the carrier wave of first balanced modulator 35, second balanced modulator 33 mutually orthogonal feeding second balanced modulator 33 through after-90 ° of phase shifts of phase shifter 34 like this.In actual applications, cosine wave generator 36 also can directly connect described second balanced modulator 33, the cosine wave of its output directly feeds second balanced modulator 33 like this, and the cosine wave of cosine wave generator 36 outputs equally also can realize making the carrier wave of first balanced modulator 35, second balanced modulator 33 mutually orthogonal through feeding first balanced modulator 35 after-90 ° of phase shifts of phase shifter 34.

Described first balanced modulator 35 is used for the first modulated orthogonal characteristic carrier 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 33 is used for the second modulated orthogonal characteristic carrier 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 modulated quadrature carrier signal output.

Therefore, among Fig. 3, the modulated quadrature carrier U of two-way of the first and second quadrature two paths of digital signals coded modulation devices, 35,33 outputs ₁(t) and 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, and this two-way modulated carrier addition, the synthetic modulated quadrature carrier of formation is:

U(t)＝V _rI(t)×ΨZ _mI(ωt)cos(ω _ct)+V _rQ(t)×ΨZ _mQ(ωt)sin(ω _ct)

Carrier wave quadrature two-way shown in Figure 3 is multiplexing to be a communication system that bandwidth efficiency is very high, forms the constellation schematic diagram of four-dimensional system M=(8 * 8) * (8 * 8)=4096 as can be known from Fig. 5 and Fig. 6, is equivalent to the modulation of QAM+QWM two-way; As the system communication by (64-QAM)+(64-QWM) form, capacity is equivalent to 4096-QAM, and the complexity of demodulation is equivalent to 64-QAM, and its transmission rate is two times of QAM.

Fig. 4 is multi-carrier orthogonal digital signal encoding modulating device (OFDM) the embodiment block diagram based on the described device of Fig. 3 of the present invention, and it has described the broadband application of multi-carrier orthogonal modulation.The device that Fig. 4 describes is based on the multiple carrier digital signal coded modulation device 4 of the quadrature digital signal coded modulation device of Fig. 3, this device 4 comprises a plurality of (at least two) quadrature digital signal coded modulation device 41,42 and 43, also comprise multichannel adder 44, quadrature four road modulated carrier signals that are used for synthetic above-mentioned a plurality of quadrature four way word signal encoding modulating devices outputs, the carrier wave of above-mentioned a plurality of quadrature four tunnel modulated feature carrier signals is mutually orthogonal, form multichannel carrier (every road carrier wave all is the carrier wave of the four road quadratures) output of four tunnel orthogonal characteristic carrier signals, it is ofdm modulation signal, be applicable to various broadband application occasions, as WLAN.

Fig. 9 is the main flow chart of the method for the invention.The described digital signal modulating mehtod of Fig. 9 is used for the coded modulation to digital signal,

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 shape of controlling features carrier wave and amplitude produce the described modulated feature carrier signal of following formula:

u(t)＝V _r(t)×ΨZ _m(ωt)；

Wherein: Ψ represents from m feature carrier wave Z _mSelect one in (ω t), promptly synchronization has only a function Z _m(ω t) working, m=0, and 1,2 ..., M; Z _m(ω t) is feature carrier waveform function, obtained divided by the feature first-harmonic by the raised cosine carrier wave with the frequency homophase, that is: Z _m(ω t)=0.5 (1-cos (ω t))/G _m(ω t);

Feature first-harmonic G _m(ω t) or feature carrier wave Z _mBe defined as one in the minor function, or several symmetries intercepting (since the m value to increase a function not enough, need get the value of a plurality of functions simultaneously and form the fundamental waveform data that can differentiate), feature first-harmonic G simultaneously _m(ω t) can also make the power spectrum concentration of energy of feature carrier wave on main lobe:

1. Gauss (guass) window function;

$w\left(n\right)=e^{(-{(n-(N-1)/2)}^2.)/\left({2*\mathrm{alpha}}^2\right)};(n=0,\&CenterDot;\&CenterDot;\&CenterDot;,N-1)$

2. breathe out bright (Hamming) window function;

w(n)＝0.54-0.46cos(2πn/(N-1))；(n＝0，…，N-1)

3. Rec graceful (Blackman) window function not;

w(n)＝0.42-0.5cos(2πn/(N-1))；(n＝0，…，N-1)

4. Blackman_Harris window function;

w(n)＝0.35875-0.48829cos(2πn/N)+0.14128cos(4πn/N)；

(n＝0，…，N-1)

5. Kai Ze (Kaiser) window function;

$w\left(n\right)=I_0\left[{\mathrm{\&omega;}}_a\sqrt{{((N-1)/2)}^2-{[n-(N-1)/2]}^2}\right]/I_0\left[{\mathrm{\&omega;}}_a((N-1)/2)\right];$

$I_0=\underset{k=0}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{[{(n/2)}^k/k!]}^2;$

I in the formula ₀Be Bezier (Bessel) function of first kind correction, (n=0 ..., N-1); 1＜ω _a((N-1)/2)＜9.

6. rectangular window function;

$w\left(n\right)=\left\{\begin{array}{cc}1& 0<=n<=N-1\\ 0& \end{array}\right.;$

7. self-defined window function 1:

$w\left(t\right)=\left\{\begin{array}{cc}(1-\cos \left(2\mathrm{\&pi;fat}\right))/2& 0<=2\mathrm{\&pi;fat}<=\mathrm{\&pi;}\\ (1-\cos \left(2\mathrm{\&pi;fbt}\right))/2& \mathrm{\&pi;}<=2\mathrm{\&pi;fbt}<=2\mathrm{\&pi;}\end{array}\right.;$

f＝2fa*fb/(fa+fb)；

8. self-defined window function 2:

$w\left(n\right)=\left\{\begin{array}{cc}{e}^{(-{(n-(N-1)3/8)}^2.)/\left({2*\mathrm{alpha}}^2\right)}& 0<=n<=(N-1)3/4\\ e^{(-{(n-(N-1)3/8)}^2.)/\left({2*\mathrm{alpha}}^2\right)}& (N-1)/4<=n<=N-1\end{array}\right..$

V _r(t) be the function of feature carrier amplitude, V _r(t)=A * (2r-1-R), r=R, R-1 ..., 2,1; Be V _r(t) implication is for evenly to be divided into the R five equilibrium to amplitude, V under the different time cycles _r(t) get different values, V in one-period _r(t) value is constant.

According to the described digital signal modulating mehtod of Fig. 9, further, in other embodiments of the invention, can make controlling features carrier amplitude V _r(t) tables of data TABLEV _rAmong []={ A* (2r-1-R) }, those position (bit) data of decision feature carrier waveform positive-negative polarity breath of not delivering a letter, but force it to equal 010101 ... also promptly even number (or odd number) cycle of the feature carrier waveform of feasible output is that positive polarity, odd number (or even number) cycle are consequent pole, make that like this feature carrier information speed is constant, make that again the frequency of feature carrier wave is original 1/2nd.

According to the described digital signal modulating mehtod of Fig. 9, further again, in other embodiments of the invention, the feature carrier generator is based on the m group numeral worry ripple device that aforesaid window function is formed, sign indicating number control bipolar code by encoder output flows to into m worry ripple device, produces the feature carrier wave.

According to Fig. 9, 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 carrier amplitude tables of data of the envelope value of the frequency schedule of used feature fundamental frequency point, used feature first-harmonic, with control foundation as above-mentioned two-dimensional modulation.

Suppose planisphere as shown in Figure 7, can determine above-mentioned three tables of data in such a way and finish modulation:

The first, determine to determine the frequency (being the f Frequency point) of the Frequency point of used feature first-harmonic 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 Frequency point (f), i.e. TABLEf[according to the frequency of set Frequency point]={ 1/ (fN) };

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 the discrete points N (for example 14 of Figure 10 points) that complete characterization first-harmonic envelope is required, according to determined all discrete points, what foundation belonged to m feature first-harmonic respectively (is G shown in Figure 7 ₁, G ₂, G ₃, G ₄Four feature first-harmonics) envelope value (is the G on the envelope _m(n) normalization data table value), i.e. TABLE G _m[]={ G _m(n) }; (n=0 ..., N-1);

The 3rd, set up the tables of data of controlling features carrier wave output amplitude, i.e. TABLEV _r[]={ A* (2r-1-R) }, r=R, R-1 ..., 2,1, promptly amplitude evenly is divided into the R five equilibrium;

The 4th, set up the feature fundamental waveform and ask the G of falling the controller _m ^-1(t) 14, described normalization data table is got the TABLE of acquisition G reciprocal _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

The 5th, set up raised cosine carrier generator Rcos (ω t) (with G _m(t) with homophase frequently), be used to store the normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape of described normalization data table control raised cosine carrier wave; Described normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, n is a predetermined raised cosine carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

The 6th, set up comprehensive synchronous multiplier, the raised cosine carrier data of input, and ask the G of falling the controller from the feature fundamental waveform _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described normalization data table TABLERcos[] and TABLEG _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) }; Wherein, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1};

The 7th, feature carrier wave normalization data table TABLEZ _m[] is stored in feature carrier waveform generator Z _mOr in the comprehensive synchronous multiplier; Described feature carrier waveform generator Z _m(according to the data of trellis encoder input), export described accent shape carrier signal:

U (t)=V _r(t) Ψ Z _m(n)=V _r(t) Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T;

Like this, can be according to the frequency f of described frequency schedule controlling features first-harmonic, according to the waveform shape G of described digital signal and described normalization data table controlling features first-harmonic _mAnd carrier waveform shape Z _m, according to the amplitude V of described digital signal and described amplitude data table controlling features carrier wave _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 waveform shape Z of controlling features carrier wave _m, and the amplitude V of controlling features carrier wave _r(t).Specifically, this step is at first determined the frequency f and the feature carrier waveform Z of feature carrier wave _m, make address search feature carrier waveform tables of data TABLEZ with the digital signal behind the described coding _m[], and produce accent shape signal Z _m=Ψ Z _m(ω t) output; Wherein, Ψ represents from m feature first-harmonic Z _mSelect one in (ω t); Again according to feature carrier amplitude V _r(t), described digital analogue signal is carried out amplitude modulation(PAM), form modulated feature carrier signal output; Described modulated feature carrier signal:

u(t)＝V _r(t)×ΨZ _m(ωt)。

Above-mentioned steps is specific implementation like this: initialization timing device and timer counter variable n (n=0), load the value (timing is T/N=1/ (fN)) of timer, wait for write data signal, at write data signal then, parallel digital data is write feature carrier waveform controller Z _mIn 10, feature carrier amplitude controller V _r(t) 17, determine to load m carrier waveform tables of data and r kind carrier amplitude data, clearing data then writes mark (suppose that this is labeled as fg_R, fg_R=0 then, 0 expression removing, 1 reference numbers signal can write each control register).Utilize feature carrier waveform controller Z _m10 TABLEZ that table look-up _m[]={ Z _m(n) }, obtain the numerical value of m feature carrier envelope tables of data of loading, utilize feature carrier amplitude controller V again _r(t) 17, table look-up and determine the output amplitude of carrier wave, 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, then continue circulation (n circulates and equals the feature carrier wave is carried out the scanning in a week week, 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 carrier wave finished promptly that (described feature carrier wave is Z _m(n) certain in), reinitialize the timer counter variable and make n=0, decapacitation timer (promptly allowing timer quit work); Load second section input data to Z _m, V _r(t) ..., enable timer again, enter the processing of the next cycle of feature carrier wave.

The above-mentioned feature carrier waveform generator Z that utilizes _m10 table look-up, and select the envelope structure of different characteristic carrier waveform, the envelope value of output characteristic carrier wave, when n=0, table look-up the envelope data of m feature carrier wave, send output buffer, at this moment, data D=Z _m(0); When n=a, table look-up the envelope data of m feature carrier wave, send output buffer, at this moment, data D=Z _m(a); When n=N-1, table look-up the envelope data of m feature carrier wave, send output buffer, at this moment, data D=Z _m(N-1); Obtain from output buffer:

u(t)＝ΨZ _m(ωt)＝0.5(1-cos(ωt))/ΨG _m(t)；

At feature carrier amplitude controller unit, according to feature carrier amplitude controller V _r(t) 17 data, TABLEV tables look-up _r[] determines the output amplitude of feature carrier wave, finishes modulated feature carrier wave output.

If adopt the amplitude of four kinds of feature first-harmonics shown in Figure 7 and waveform planisphere, then M=V at system M=16 _r(t) * G _m=4 * 4=64; Wherein: V ₁To V ₄Be V _r(t) span; G ₁To G ₄Be G _m(t) span;

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, as shown in Figure 8;

In the described method of Fig. 9, can also comprise the step of modulated feature carrier signal being carried out the carrier wave quadrature modulation.Respectively the described the first and second tunnel modulated feature carrier signals are multiplied each other with sinusoidal and cosine carrier, export the modulated carrier signal of two road carrier wave quadratures, after the first via and the second road modulated carrier signal carried out addition, output orthogonal modulated carrier signal, such advantage can make full use of the channel spectrum resource exactly, increases the transmission capacity of channel.Modulated quadrature carrier (QWAM) signal is:

U(t)＝V _rI(t)×ΨZ _mI(ωt)cos(ω _ct)+V _rQ(t)×ΨZ _mQ(ωt)sin(ω _ct)

Wherein: Ψ Z _m(ω t), m=0,1,2 ..., M, Ψ represent from m feature carrier wave Z _MI(ω t) and Z _MQSelect one in (ω t); Be that synchronization has only a function Z _MI(ω t) and Z _MQ(ω t) is simultaneously in work; V _R1(t), V _R2(t) be the amplitude of modulated feature carrier signal respectively; Owing to increased the step of quadrature modulation, made the modulated carrier signal have higher transmittability.

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, promptly can increase number, the feature carrier amplitude progression of feature carrier waveform, or the like.

Also need explanation, in the concrete enforcement of apparatus and method of the present invention, final digital signal all will be by the waveform signal of D/A converter output simulation from device.

Claims (15)

1, a kind of digital signal encoding modulating device, the encoding digital signals that is used for needs are transmitted is modulated, and comprising:

Feature carrier waveform generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), the feature fundamental waveform is asked the G of falling the controller _m ^-1(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described feature fundamental waveform is asked the G of falling the controller _m ^-1(t), be used for from described feature fundamental waveform controller G _m(t) obtain described normalization data table, should show data and get the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], described TABLEG _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and asks the G of falling the controller from the feature fundamental waveform _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and the table of falling normalization data TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

u(t)＝ΨZ _m(n)＝ΨZ _m(ωt)；

Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data,, form and transfer shape amplitude modulation feature carrier signal u (t) output, described accent shape amplitude modulation feature carrier signal u (t)=V according to the amplitude of described digital signal and described amplitude data table controlling features carrier wave _r(t) * Ψ Z _m(ω t);

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.

2, digital signal encoding modulating device as claimed in claim 1 is characterized in that, described device also comprises trellis encoder, be used for the digital signal of input is carried out grid coding, and the parallel feature fundamental waveform controller G that sends into of the digital signal after will encoding _m(t) and feature carrier amplitude controller V _r(t).

3, digital signal encoding modulating device as claimed in claim 2, 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.

4, 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:

-90 ° of phase shifters are used for the second feature carrier signal of second digital signal encoding modulating device output is carried out-90 ° of phase shifts;

Comprehensive adder is used for first of synthetic first digital signal encoding modulating device output and transfers second of shape amplitude modulation feature carrier signal and-90 ° of phase shifter outputs to transfer shape amplitude modulation feature carrier signal, forms quadrature two tunnel modulated feature carrier signal outputs.

5, a kind of carrier wave quadrature digital signal coded modulation device based on claim 1,2 or 3 described digital signal encoding modulating devices, comprise the first and second digital signal encoding modulating devices, it is characterized in that also comprising: the digital signal after will encoding is divided four tunnel parallel first (I), second (Q) feature carrier waveform generator Z of sending into _m(t) and first (I), second (Q) feature carrier amplitude controller V _r(t); It is characterized in that also comprising:

First balanced modulator is used for that the first modulated digital signal of described first digital signal encoding modulating device output is carried out balanced amplitude modulation with sinusoidal carrier or cosine carrier and modulates;

Second balanced modulator is used for that the second modulated digital signal of described second digital signal encoding modulating device output is carried out balanced amplitude modulation with cosine carrier or sinusoidal carrier and modulates;

Comprehensive adder is used for the modulation signal that synthetic first balanced modulator and second balanced modulator are exported, and forms quadrature modulated carrier signal (QWAM) output:

U(t)＝V _rI(t)×ΨZ _mI(ωt)cos(ω _ct)+V _rQ(t)×ΨZ _mQ(ωt)sin(ω _ct)；

Wherein, Ψ represents from m feature carrier wave Z _mSelect one in (ω t), ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into.

6, a kind of multi-carrier orthogonal digital signal encoding modulating device based on the described carrier wave quadrature digital signal of claim 5 coded modulation device comprises at least two quadrature digital signal coded modulation devices, it is characterized in that also comprising:

The multichannel adder is used for the quadrature modulated carrier signal that synthetic above-mentioned at least two quadrature digital signal coded modulation devices are exported, and forms multichannel time-frequency domain equal quadrature modulated carrier signal (OFDM) output.

7, a kind of digital signal encoding modulating device is used for the coded modulation to needs transmission digital signal, comprising:

Feature carrier waveform generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and from feature fundamental waveform controller G _m(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and normalization data table TABLE G _m[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

u(t)＝ΨZ _m(n)＝ΨZ _m(ωt)；

Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data,, form and transfer shape amplitude modulation feature carrier signal u (t) output, described accent shape amplitude modulation feature carrier signal u (t)=V according to the amplitude of described digital signal and described amplitude data table controlling features carrier wave _r(t) * Ψ Z _m(ω t);

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.

8, a kind of digital signal encoding modulating device is used for the coded modulation to needs transmission digital signal, comprising:

Feature carrier wave shape generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), on-off controller, feature fundamental waveform are asked the G of falling the controller _m ^-1(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described feature fundamental waveform is asked the G of falling the controller _m ^-1(t), be used for from described feature fundamental waveform controller G _m(t) obtain described normalization data table, should show data and get the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], described TABLEG _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described on-off controller is when m＞k, with described feature fundamental waveform controller G _mThe feature first-harmonic data of output (t) are input to described comprehensive synchronous multiplier, when m＜=k, described feature fundamental waveform are asked the G of falling the controller _m ^-1(t) output characteristic first-harmonic data are input to described comprehensive synchronous multiplier, and wherein k is the k of m feature first-harmonic;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and from feature fundamental waveform controller G _m(t) or from the feature fundamental waveform ask the G of falling the controller _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and normalization data table TABLE G _m[] or the table of falling normalization data TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) * G _m(n) } or={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

U (t)=Ψ Z _m(n)=Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data,, form and transfer shape amplitude modulation feature carrier signal u (t) output, described accent shape amplitude modulation feature carrier signal u (t)=V according to the amplitude of described digital signal and described amplitude data table controlling features carrier wave _r(t) * Ψ Z _m(ω t);

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.

9, a kind of digital signal encoding modulating device is used for the coded modulation to needs transmission digital signal, comprising:

Feature carrier waveform generator, described feature carrier waveform generator comprises feature fundamental waveform controller G _m(t), the feature fundamental waveform is asked the G of falling the controller _m ^-1(t), raised cosine carrier generator Rcos (ω t) and comprehensive synchronous multiplier;

Described feature fundamental waveform controller G _m(t), be used to store the normalization data table of the amplitude of used feature first-harmonic, according to the waveform shape and the output of described digital signal and described normalization data table controlling features first-harmonic; Described normalization data table TABLEG _m[] is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature first-harmonic; G _mBe m feature first-harmonic, 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;

Described feature fundamental waveform is asked the G of falling the controller _m ^-1(t), be used for from described feature fundamental waveform controller G _m(t) obtain described normalization data table, should show data and get the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], described TABLEG _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

Described raised cosine carrier generator Rcos (ω t) is used to store the raised cosine normalization data table of the amplitude of used raised cosine carrier wave, according to the waveform shape data of described raised cosine normalization data table control output raised cosine carrier wave; Described raised cosine normalization data table is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, wherein: ω=2 π f=2 π/T, n is a predetermined raised cosine carrier envelope discrete point, n={0, N-1}, the isodisperse of N for the raised cosine carrier wave in the one-period T evenly is divided into;

Described comprehensive synchronous multiplier is used for described raised cosine carrier waveform data, and asks the G of falling the controller from the feature fundamental waveform _m ^-1(t) Shu Ru feature first-harmonic data sync multiplies each other, promptly described raised cosine normalization data table TABLERcos[] and the table of falling normalization data TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) } and output characteristic carrier waveform data-signal, promptly the unipolarity raised cosine is transferred the shape carrier signal;

Described unipolarity raised cosine transfers shape carrier signal u (t) to be:

U (t)=Ψ Z _m(n)=Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

Feature carrier wave polarity controller P[], be used to control unipolar raised cosine and become bipolarity raised cosine feature carrier wave; Make that simultaneously the feature carriers rate is constant, make that again the feature carrier frequency is original 1/2nd; Described feature carrier wave polarity (polarity) controller P[] be output as:

U (t)=P (t) * Ψ Z _m(ω t)=0.5 (1-cos (ω t))/Ψ G _m(t), when t=2iT;

U (t)=P (t) * Ψ Z _m(ω t)=0.5 (cos (ω t)-1)/Ψ G _m(t), when t=(2i+1) T;

$P\left(t\right)=\left\{\begin{array}{cc}1& t=2\mathrm{iT}\\ -1& t=(2i+1)T\end{array}\right.;$

Wherein i=0,1,2, Ψ represents from m feature carrier wave Z _m(ω t) or G _m(t) select one in;

Feature carrier amplitude controller V _r(t), be used to store used feature carrier amplitude tables of data, amplitude according to described digital signal and described amplitude data table control bipolarity raised cosine feature carrier wave forms and transfers shape amplitude modulation feature carrier signal U (t) output, described accent shape amplitude modulation feature carrier signal U (t)=V _r(t) * P (t) * Ψ Z _m(ω t);

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.

10, a kind of digital signal modulating mehtod comprises:

Set up the normalization data table, the tables of data of controlling features carrier amplitude of envelope value of normalization data table, raised cosine Rcos (ω t) carrier wave of the frequency time value table of used feature first-harmonic, used feature first-harmonic envelope value;

Described frequency time value table is: TABLEf[]=1/ (fN)=T/N, wherein: the isodisperse of N for the feature first-harmonic in the one-period evenly is divided into;

The normalization data table of described feature first-harmonic envelope value is: TABLEG _m[]={ G _m(n) }, wherein, m is the number of predetermined feature carrier wave, G _mBe m feature first-harmonic, 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;

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;

The normalization data table of described raised cosine Rcos (ω t) carrier envelope value is: TABLERcos[]={ 0.5 (1-cos (2 π n/ (N-1))) }, described raised cosine carrier wave and feature first-harmonic are with the frequency homophase;

The normalization data table of described feature first-harmonic envelope value is got the table of falling the normalization data TABLE G that obtains reciprocal _m ^-1[], and output characteristic fundamental waveform data;

Described TABLE G _m ^-1[]={ G _m ^-1(n) }={ 1/G _m(n) };

The digital signal that input will be encoded is obtained raised cosine carrier waveform data, multiplies each other promptly described normalization data table TABLERcos[with described feature fundamental waveform data sync] and TABLE G _m ^-1[] corresponding point multiplies each other synchronously, obtains feature carrier wave normalization data table TABLEZ _m[], described TABLEZ _m[]={ Z _m(n) }={ 0.5 (1-cos (2 π n/ (N-1))) } * { G _m ^-1(n) }={ 0.5 (1-cos (2 π n/ (N-1)))/G _m(n) }, and output transfer shape carrier signal u (t);

U (t)=Ψ Z _m(n)=Ψ Z _m(ω t); Wherein, Ψ represents from m feature carrier wave Z _m(n) select one in, ω=2 π f=2 π/T;

Wherein, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}; The isodisperse of N for the feature carrier wave in the one-period T evenly is divided into;

According to the frequency f of described digital signal and described frequency time value table controlling features first-harmonic and feature carrier wave, according to the waveform shape Z of described digital signal and described feature carrier wave normalization data table controlling features carrier wave _m, and according to the amplitude V of described digital signal and described amplitude data table controlling features carrier wave _r(t);

According to the tables of data of controlling features carrier amplitude, described digital analogue signal u (t) is carried out amplitude modulation(PAM), form and transfer shape amplitude modulation feature carrier signal output u (t); Described accent shape amplitude modulation feature carrier signal u (t) is:

u(t)＝V _r(t)×ΨZ _m(n)＝V _r(t)×ΨZ _m(ωt)。

11, digital signal modulating mehtod as claimed in claim 10 is characterized in that, described method also comprises the step of two tunnel modulated feature carrier signals being carried out the carrier wave quadrature modulation, and this step is:

Adopt sine and cosine carrier respectively the described the first and second tunnel modulated feature carrier signals to be multiplied each other, export the modulated carrier signal of two road carrier wave quadratures, the first via and the second road modulated carrier signal are carried out addition, output orthogonal modulated carrier signal:

U(t)＝V _rI(t)×ΨZ _mI(ωt)cos(ω _ct)+V _rQ(t)×ΨZ _mQ(ωt)sin(ω _ct)；

Wherein, Ψ represents from m feature carrier wave Z _mSelect one in (ω t), ω=2 π f=2 π/T, m is the number of predetermined feature carrier wave, Z _mBe m feature carrier wave, n is a predetermined feature carrier envelope discrete point, n={0 ..., N-1}, the isodisperse of N for the feature carrier wave in the one-period T evenly is divided into.

As claim 10,11 described digital signal modulating mehtods, it is characterized in that 12, described method also comprises, at the waveform shape Z according to described Digital Signals feature carrier wave _m, and the amplitude V of controlling features carrier wave _r(t) before the operation, the digital signal of input is carried out grid coding.

13, digital signal modulating mehtod as claimed in claim 12 is characterized in that, the wave function G of described feature first-harmonic _m(n) or feature carrier wave Z _m(n) by the one or more symmetries of carrying out as minor function are intercepted acquisition:

1. Gauss (guass) window function;

$w\left(n\right)=e^{(-{(n-(N-1)/2)}^2.)/(2*\mathrm{alph}{a}^2)};$ (n＝0，…，N-1)

2. breathe out bright (Hamming) window function;

w(n)＝0.54-0.46cos(2πn/(N-1))；(n＝0，…，N-1)

3. Rec graceful (Blackman) window function not;

w(n)＝0.42-0.5cos(2πn/(N-1))；(n＝0，…，N-1)

4. Blackman_Harris window function;

w(n)＝0.35875-0.48829cos(2πn/N)+0.14128cos(4πn/N)；(n＝0，…，N-1)

5. Kai Ze (Kaiser) window function;

$w\left(n\right)=I_0\left[{\mathrm{\&omega;}}_a\sqrt{{((N-1)/2)}^2-{[n-(N-1)/2}^2}\right]/I_0\left[{\mathrm{\&omega;}}_a((N-1)/2)\right];$

$I_0=\underset{k=0}{\overset{\&infin;}{\mathrm{\&Sigma;}}}{[{(n/2)}^k/k!]}^2;$

I in the formula ₀Be Bezier (Bessel) function of first kind correction, (n=0 ..., N-1); 1＜ω _a((N-1)/2)＜9.

6. rectangular window function;

$w\left(n\right)=\left\{\begin{array}{cc}1& 0<=n<=N-1\\ 0& \end{array}\right.;$

7. self-defined window function 1:

$w\left(t\right)=\left\{\begin{array}{cc}(1-\cos \left(2\mathrm{\&pi;fat}\right))/2& 0<=2\mathrm{\&pi;fat}<=\mathrm{\&pi;}\\ (1-\cos \left(2\mathrm{\&pi;fbt}\right))/2& \mathrm{\&pi;}<=2\mathrm{\&pi;fbt}<=2\mathrm{\&pi;}\end{array}\right.;$

f＝2fa*fb/(fa+fb)；

8. self-defined window function 2:

$w\left(n\right)=\left\{\begin{array}{cc}{e}^{(-{(n-(N-1)3/8)}^2.)/(2*{\mathrm{alpha}}^2)}& 0<=n<=(N-1)3/4\\ e^{(-{(n-(N-1)3/8)}^2.)/(2*{\mathrm{alpha}}^2)}& (N-1)/4<=n<=N-1\end{array}\right..$

14, digital signal modulating mehtod as claimed in claim 12, its feature also are, at controlling features carrier amplitude V _r(t) tables of data TABLEV _rAmong []={ A* (2r-1-R) }, the data of decision feature carrier waveform positive-negative polarity, be not used in transmission information but force it to equal 010101 ..., also promptly even number (or odd number) cycle of the feature carrier waveform of feasible output is that positive polarity, odd number (or even number) cycle are consequent pole.

15, digital signal modulating mehtod as claimed in claim 12, its feature also is, the feature carrier generator is based on the digital worry of the m group ripple device that the described window function of claim 13 is formed, and the sign indicating number control bipolar code of being exported by encoder flows to into m worry ripple device, generation feature carrier wave.

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