CN103475895B - Reversing spectrum judgment means and reversing spectrum determination methods - Google Patents

Abstract

The invention provides a kind of reversing spectrum judgment means, comprise a differential correlator and a judge module.This differential correlator in order to impose the differential related operation of odd number order to an input signal and a known signal, to produce a differential motion relevant result.When this input signal is judged as the echo signal corresponding to this known signal, according to the phase place of this differential motion relevant result, this judge module judges whether this input signal exists a reversing spectrum situation.

Description

Reversing spectrum judgment means and reversing spectrum determination methods

Technical field

The present invention is relevant to wireless communication technology, and especially to judge whether wireless communication signals exists the technology of reversing spectrum (spectruminversion) situation relevant.

Background technology

Along with the progress of the communication technology, the development of digital television broadcasting is gradually ripe.Except transmitting via cable line, digital television signal also can pass through the equipment such as base station or artificial satellite and is passed with the kenel of wireless signal.First generation Digital Television satellite broadcasting (digitalvideobroadcasting – satellite, referred to as DVB-S) specification and second generation Digital Television satellite broadcasting specification (DVB-S2) are all the standards be widely adopted in this field current.

In DVB-S2 specification, the input signal that the baseband demodulator of digital television signal receiving terminal receives is through pi/2-skew binary phase offset modulation (pi/2-shiftedbinaryphaseshiftkeying, referred to as BPSK) signal, be therefore made up of same phase constituent (in-phasecomponent) and orthogonal component (quadraturephasecomponent).In practice, the same phase constituent in signal and orthogonal component likely exchange by the tuner (tuner) of DVB-S2 receiving terminal and mixer (mixer) by mistake, and this i.e. reversing spectrum (spectruminversion) phenomenon.If baseband demodulator does not detect this problem early, after follow-up numerous signal processing flow terminates, just find that television system cannot correctly start, and after just must exchanging with phase constituent and orthogonal component, performs these signal processing flows again.It can thus be appreciated that, the available machine time of the problem meeting significant delays television system of reversing spectrum.

Summary of the invention

For solving the problem, the present invention proposes a kind of reversing spectrum judgment means and reversing spectrum determination methods, input signal is imposed to the differential related operation of odd number order, and judges whether this input signal exists reversing spectrum situation according to the phase place of operation result.Among the digital television signal receiving terminal that can not only be applied in DVB-S2 specification according to reversing spectrum judgment means of the present invention and reversing spectrum determination methods, also can be extended to signal and had the other system of similar characteristic.

A specific embodiment according to the present invention is a kind of reversing spectrum judgment means, wherein comprises a differential correlator and a judge module.This differential correlator in order to impose the differential related operation of odd number order to an input signal and a known signal, to produce a differential motion relevant result.When this input signal is judged as the echo signal corresponding to this known signal, according to the phase place of this differential motion relevant result, this judge module judges whether this input signal exists a reversing spectrum situation.

Another specific embodiment according to the present invention is a kind of reversing spectrum determination methods, and first the method performs a calculation step, imposes the differential related operation of odd number order to an input signal and a known signal, to produce a differential motion relevant result.Then, when this input signal is judged as the echo signal corresponding to this known signal, namely the method performs a determining step, judges whether this input signal exists a reversing spectrum situation according to the phase place of this differential motion relevant result.

Can be further understood by following detailed description and accompanying drawings about the advantages and spirit of the present invention.

Accompanying drawing explanation

Fig. 1 is the calcspar according to the reversing spectrum judgment means in one embodiment of the invention.

Fig. 2 is the example that reversing spectrum judgment means according to the present invention comprises a control module further.

Fig. 3 (A) and Fig. 3 (B) is in order to present the analog result adopted according to the solution of the present invention gained.

Fig. 4 is according to the reversing spectrum determination methods flow chart in one embodiment of the invention.

Main element symbol description

100: reversing spectrum judgment means 12: differential correlator

14: judge module 14A: phase detecting circuit

16: control module

Embodiment

Be the reversing spectrum judgment means 100 shown in Fig. 1 according to one embodiment of the invention, wherein comprise differential correlator (differentialcorrelator) 12 and judge module 14.In actual applications, reversing spectrum judgment means 100 can be incorporated in the digital television signal receiving terminal of employing DVB-S2 specification, but not as limit.

According to DVB-S2 specification, the beginning region (startofframe, referred to as SOF) of Frame comprises 26 symbol (symbol) S altogether ₀~ S ₂₅, S wherein ₀, S ₂, S ₄..., S ₂₄identical and positive and negative identical with orthogonal (quadrature) composition size Deng 13 symbols homophase separately (in-phase) composition; Moreover, S ₁, S ₃, S ₅..., S ₂₅identical with orthogonal component size and on the contrary positive and negative etc. other 13 symbols same phase constituent separately.If indicate these symbols in complex number plane, S ₀, S ₂, S ₄..., S ₂₄first quartile or third quadrant is appeared in, S Deng symbol ₁, S ₃, S ₅..., S ₂₅the second quadrant or fourth quadrant is appeared in Deng symbol.

Based on above-mentioned symbol characteristic, even if there is the situation of reversing spectrum, the symbol S after reversion ₀, S ₂, S ₄..., S ₂₄the quadrant at place can't change, that is maintains first quartile or third quadrant.But, symbol S ₁, S ₃, S ₅..., S ₂₅the impact of reversing spectrum can be subject to and change its quadrant.More particularly, the symbol originally at the second quadrant when not reversing appears in fourth quadrant after reversion, and the symbol originally in fourth quadrant when not reversing appears in the second quadrant after reversion.In other words, if there is the situation of reversing spectrum, the symbol S in the initiation region of DVB-S2 Frame ₀, S ₂, S ₄..., S ₂₄can not change, but symbol S during reversing spectrum ₁, S ₃, S ₅..., S ₂₅symbol S when not reversing with frequency spectrum ₁, S ₃, S ₅..., S ₂₅differ a negative sign.

The standard content of the initiation region of DVB-S2 Frame is known to receiving terminal.Therefore, reversing spectrum judgment means 100 can set a known signal S as reference frame, and it comprises the standard content s of the initiation region of DVB-S2 Frame ₀~ s ₂₅.Below illustrate and first suppose that reversing spectrum judgment means 100 has confirmed that an input signal R is the initiation region of certain DVB-S2 Frame, but still whether uncertain input signal R exists reversing spectrum situation.

If there is not reversing spectrum situation in input signal R, i-th symbol r wherein _iwith the symbol s of i-th in known signal S _ipass be:

R _i=s _ie ^{j2 π f (iT)}fori=0,1,2,3 ..., (N-1), (formula one)

T represents the Cycle Length of these symbols, f to represent when input signal R enters differential correlator 12 with carrier frequency shift (carrierfrequencyoffset, referred to as CFO), N represents each self-contained symbol quantity of input signal R and known signal S (equaling 26 in this example).

After receiving input signal R, differential correlator 12 couples of input signal R and known signal S carry out the differential related operation of at least one odd number order.In the present embodiment, following equation signifier is a step differential related operation, and differential correlator 12 can produce differential motion relevant result d1:

$d_1=\underset{i=1}{\overset{N-1}{\mathrm{\Σ}}}{r}_i^{*}{s}_i{r}_{i-1}{s}_{i-1}^{*},$ (formula two)

According to formula one, formula two can be as follows by abbreviation:

$d_1=(s_1^{*}{s}_1{s}_0{s}_0^{*}+s_2^{*}{s}_2{s}_1{s}_1^{*}+...+s_{25}^{*}{s}_{25}{s}_{24}{s}_{24}^{*})\·e^{-j2\mathrm{\πfT}}$

$=({\left|s_1\right|}^2{\left|s_0\right|}^2+{\left|s_2\right|}^2{\left|s_1\right|}^2+...+{\left|s_{25}\right|}^2{\left|s_{24}\right|}^2)\·e^{-j2\mathrm{\πfT}},$ (formula three)

Can be found out by formula three, when input signal R does not exist reversing spectrum situation, differential motion relevant result d ₁phase place Arg (d ₁) be (-2 π fT); If carrier frequency shift f levels off to zero, then Arg (d ₁) also level off to zero.In practice, after reversing spectrum judgment means 100 can be arranged at an offset correction of carrier frequency device, carrier frequency shift f is reduced as far as possible.

Relatively, if there is reversing spectrum situation in input signal R, i-th symbol r wherein _iwith the symbol s of i-th in known signal S _ipass be:

$\left\{\begin{array}{cc}{r}_i=s_i{e}^{j2\mathrm{\πf}\left(\mathrm{iT}\right)}& \mathrm{fori}=\mathrm{0,2,4,6,8}...\\ r_i=s_i{e}^{j2\mathrm{\πf}\left(\mathrm{iT}\right)}\·e^{\mathrm{j\π}}& \mathrm{fori}=\mathrm{1,3,5,7,9}...\end{array}\right.,$ (formula four)

If rewrite formula two according to formula four can obtain:

$d_1=(s_1^{*}{s}_1{s}_0{s}_0^{*}+s_2^{*}{s}_2{s}_1{s}_1^{*}+...+s_{25}^{*}{s}_{25}{s}_{24}{s}_{24}^{*})\·e^{-j2\mathrm{\πfT}}\·e^{\mathrm{j\π}}$

$=({\left|s_1\right|}^2{\left|s_0\right|}^2+{\left|s_2\right|}^2{\left|s_1\right|}^2+...+{\left|s_{25}\right|}^2{\left|s_{24}\right|}^2)\·e^{-j2\mathrm{\πfT}}\·e^{\mathrm{j\π}}.$ (formula five)

Can be found out by formula five, when input signal exists reversing spectrum situation, differential motion relevant result d ₁phase place Arg (d ₁) be (-2 π fT+ π); If carrier frequency shift f levels off to zero, then Arg (d ₁) level off to π.

As shown in Figure 1, a phase detecting circuit 14A can be set, in order to judge differential motion relevant result d in judge module 14 ₁phase place Arg (d ₁).Subsequently, judge module 14 can according to Arg (d ₁) judge whether input signal R exists reversing spectrum situation.For example, judge module 14 can set threshold value is pi/2; If correspond to the Arg (d of an input signal ₁) being less than pi/2, namely judge module 14 judges that this input signal does not exist reversing spectrum situation.Relatively, if the Arg (d of an input signal ₁) being greater than pi/2, judge module 14 just notifies that in-phase signal and orthogonal signalling must exchange by subsequent conditioning circuit.

In actual applications, the method that may there is no when reversing spectrum judgment means 100 receives an input signal determines that whether this input signal is the initiation region of certain DVB-S2 Frame.In theory, if an input signal is the initiation region of DVB-S2 Frame really, the degree of correlation between this input signal and aforementioned known signal must not be low, makes differential motion relevant result d ₁absolute value must exceed certain threshold value.Relatively, if an input signal is not the initiation region of DVB-S2 Frame, its differential motion relevant result d ₁absolute value can be less than this threshold value.Therefore, the differential motion relevant result d of differential correlator 12 generation ₁also can as judging that whether an input signal is the foundation of the initiation region of DVB-S2 Frame.

In sum, for an input signal, judge module 14 first can according to its differential motion relevant result d ₁absolute value | d _m1| judge that whether this input signal is the initiation region of DVB-S2 Frame.If this judged result is yes, judge module 14 is just further according to differential motion relevant result d ₁phase place Arg (d ₁) judge whether this input signal exists reversing spectrum situation.

Should be noted that, the computing performed by differential correlator 12 is not limited to an above-mentioned step differential related operation.Impose to an input signal R and known signal S the differential motion relevant result dm that m step differential related operation produces can be expressed as follows:

$d_m=\underset{i=m}{\overset{N-1}{\mathrm{\Σ}}}{r}_i^{*}{s}_i{r}_{i-m}{s}_{i-m}^{*}.$ (formula six)

According to formula one, formula six can be as follows by abbreviation:

$d_m=(s_m^{*}{s}_m{s}_0{s}_0^{*}+s_{m+1}^{*}{s}_{m+1}{s}_1{s}_1^{*}+...+s_{25}^{*}{s}_{25}{s}_{25-m}{s}_{25-m}^{*})\·e^{-j2\mathrm{\πf}\left(\mathrm{mT}\right)}$

When m is even number, the result of rewriting formula six gained according to formula four can obtain:

D _m=(| s _m| ²| s ₀| ²+ | s _m+1| ²| s ₁| ²+ ...+| s ₂₅| ²| s _25-m| ²) e ^{-j2 π f (mT)}, (formula seven)

When m is odd number, rewriting formula six according to formula four can obtain:

D _m=(| s _m| ²| s ₀| ²+ | s _m+1| ²| s ₁| ²+ ...+| s ₂₅| ²| s _25-m| ²) e ^{-j2 π f (mT)}e ^{j π}, (formula eight)

Can be found out, if m is even number, no matter whether to there is reversing spectrum situation, differential motion relevant result d by formula seven and formula eight _mphase place Arg (d _m) be all [-2 π f (mT)].If m is odd number, there is not the Arg (d corresponding to input signal of reversing spectrum situation _m) be [-2 π f (mT)], there is the Arg (d corresponding to input signal of reversing spectrum situation _m) be then [-2 π f (mT)+π].Easy speech it, only have the differential related operation of odd number order, just can produce and can judge whether input signal exists the differential motion relevant result of reversing spectrum situation according to this.Therefore, differential correlator 12 is designed at least perform an odd number order (single order, three rank, five rank ...) differential related operation.

In practice, the result that the differential related operation of higher-order time produces is relatively accurate.As shown in Figure 2, reversing spectrum judgment means 100 can comprise a control module 16 further, and the channel environment in order to pass through according to input signal determines the order m that differential correlator 12 should adopt.Channel environment is poorer, and control module 16 can select larger order m, improves accuracy by this.In one embodiment, for good channel environment, even control module 16 order m is 1; For severe channel environment, even control module 16 order m is 3.

In another embodiment, differential correlator 12 is designed to simultaneously or successively performs the differential related operation of at least two different odd-order time (m1, m2):

$d_{m1}=\underset{i=m1}{\overset{N-1}{\mathrm{\Σ}}}{r}_i^{*}{s}_i{r}_{i-m1}{s}_{i-m1}^{*}$ And $d_{m2}=\underset{i=m2}{\overset{N-1}{\mathrm{\Σ}}}{r}_i^{*}{s}_i{r}_{i-m2}{s}_{i-m2}^{*}.$

Accordingly, judge module 14 can be designed to simultaneously with reference to the first differential motion relevant result d _m1phase place Arg (d _m1) and the second differential motion relevant result d _m2phase place Arg (d _m2) judge whether input signal exists reversing spectrum situation.For example, judge module 14 can according to Arg (d _m1) * w1+Arg (d _m2) higher than a threshold value, whether * w2 judge whether input signal exists reversing spectrum situation, wherein w1, w2 are the proportion parameter that can predetermine.In addition, judge module 14 also can according to the first differential motion relevant result d _m1absolute value | d _m1| with the second differential motion relevant result d _m2absolute value | d _m2|, (such as | d _m1| with | d _m2| summation), judge that whether input signal is the initiation region of DVB-S2 Frame.

In another embodiment, differential correlator 12 can be designed to optionally produce the second differential motion relevant result d _m2.For example, the control module 16 in Fig. 2 can determine whether need generation second differential motion relevant result d according to channel environment _m2.If it is severe that the determination result of control module 16 is current channel environment, differential correlator 12 just additionally produces the second differential motion relevant result d _m2, otherwise only produce the first differential motion relevant result d _m1.

In another embodiment, differential correlator 12 is designed to simultaneously or successively performs the differential related operation of an odd number order (m1) and an even number order (m3):

$d_{m1}=\underset{i=m1}{\overset{N-1}{\mathrm{\Σ}}}{r}_i^{*}{s}_i{r}_{i-m1}{s}_{i-m1}^{*}$ And $d_{m3}=\underset{i=m3}{\overset{N-1}{\mathrm{\Σ}}}{r}_i^{*}{s}_i{r}_{i-m3}{s}_{i-m3}^{*}.$

For m1 be 1, m3 for 2, when input signal does not exist reversing spectrum situation, differential motion relevant result d ₁phase place Arg (d1) equal (-2 π fT), differential motion relevant result d ₂phase place Arg (d ₂) equal (-4 π fT); Phase difference [Arg (d ₁)-Arg (d ₂)] be (2 π fT).Relatively, when input signal exists reversing spectrum situation, the phase place Arg (d of differential motion relevant result d1 ₁) equal (-2 π fT+ π), the phase place Arg (d of differential motion relevant result d2 ₂) equal (-4 π fT); Phase difference [Arg (d ₁)-Arg (d ₂)] be (2 π fT+ π).Based on above-mentioned phase difference characteristic, because carrier frequency shift f levels off to zero, judge module 14 also can according to the first differential motion relevant result d _m1with the 3rd differential motion relevant result d _m3phase difference [Arg (d _m1)-Arg (d _m3)] find out whether input signal exists reversing spectrum situation.

On the other hand, even if differential motion relevant result d _m3phase place Arg (d _m3) cannot separately as judging whether input signal exists the foundation of reversing spectrum situation, differential motion relevant result d _m3absolute value | d _m3| still have a reference value.For example, judge module 14 can according to the first differential motion relevant result d _m1absolute value | d _m1| with the 3rd differential motion relevant result d _m3absolute value | d _m3|, (such as | d _m1| with | d _m3| summation), judge that whether input signal is the initiation region of DVB-S2 Frame.

In practice, differential correlator 12 also can be designed to perform multiple odd number order and the differential related operation of multiple even number orders.For example, differential correlator 12 can perform four kinds of differential related operations such as single order, second order, three rank, quadravalence for an input signal simultaneously.Under these circumstances, judge module 14 can according to the absolute value summation of four operation results, judge that whether this input signal is the initiation region of DVB-S2 Frame, and only judge whether this input signal exists reversing spectrum situation according to the phase place of the result of single order and three step differential related operations.

Should be noted that, reversing spectrum judgment means 100 treatable input signal be not limited with the initiation region of DVB-S2 Frame; As long as have the signal (s of same nature _2jsame phase constituent identical with orthogonal component size and positive and negative identical, s _2j+1same phase constituent identical with orthogonal component size and positive and negative contrary) be all applicable to aforementioned determining program.

For example, the input signal being provided to reversing spectrum judgment means 100 also can comprise the physical layer signal code (physicallayersignalingcode followed behind the initiation region of DVB-S2 Frame further, referred to as PLSC), or only comprise the partial sector of initiation region of DVB-S2 Frame.

Table content in Fig. 3 (A) and Fig. 3 (B) is for unlike signal noise ratio (signaltonoiseratio, referred to as SNR) additive white Gaussian noise (additivewhiteGaussiannoise, referred to as AWGN) passage produce analog result.SR conventional letter rate (symbolrate).

Can be found out by these two forms, when input signal does not exist reversing spectrum situation, the phase place of single order ~ quadravalence differential motion relevant result is all quite little.When input signal exists reversing spectrum situation, the phase place of single order and three step differential correlated results is all quite close to π.According to these analog results, really effectively can judge whether input signal exists reversing spectrum situation according to reversing spectrum judgment means 100 of the present invention.

Be reversing spectrum determination methods according to another embodiment of the present invention, its flow chart as shown in Figure 4.First, step S41 for impose following m1 step differential related operation (m1 is odd number) to an input signal and a known signal, to produce the first differential motion relevant result d _m1:

$d_{m1}=\underset{i=m1}{\overset{N-1}{\mathrm{\Σ}}}{r}_i^{*}{s}_i{r}_{i-m1}{s}_{i-m1}^{*}.$

Step S42 is then when this input signal is judged as an echo signal corresponding to this known signal, according to this first differential motion relevant result d _m1phase place judge whether this input signal exists a reversing spectrum situation.

Several circuit operation flow change previously described when introducing reversing spectrum judgment means 100, (the differential related operation such as first judged before step S42 whether this input signal is echo signal, carrying out the secondary differential related operation of two different odd-order, carry out an odd number order and an even number order ...), also can be applied in the reversing spectrum determination methods that Fig. 4 illustrates, its details repeats no more.

As mentioned above, the present invention proposes a kind of reversing spectrum judgment means and reversing spectrum determination methods, input signal is imposed to the differential related operation of odd number order, and judges whether this input signal exists reversing spectrum situation according to the phase place of operation result.Among the digital television signal receiving terminal that can not only be applied in DVB-S2 specification according to reversing spectrum judgment means of the present invention and reversing spectrum determination methods, also can be extended to signal and had the other system of similar characteristic.

By the above detailed description of preferred embodiments, it is desirable to clearly to describe feature of the present invention and spirit, and not with above-mentioned disclosed preferred embodiment, category of the present invention is limited.On the contrary, its objective is wish to contain various change and tool equality be arranged in the present invention institute in the category of the scope of the claims applied for.

Claims (20)

1. a reversing spectrum judgment means, comprises:

One differential correlator, in order to impose the differential related operation of odd number order to an input signal and a known signal, to produce one first differential motion relevant result d _m1; And

One judge module, is coupled to this differential correlator, and when this input signal is judged as the echo signal corresponding to this known signal, this judge module is according to this first differential motion relevant result d _m1phase place judge whether this input signal exists a reversing spectrum situation, wherein this judge module is according to this first differential motion relevant result d _m1absolute value judge whether this input signal is this echo signal

Wherein, the differential related operation of this odd number order comprises:

Wherein, it is odd number that odd number order represents order m1, this input signal and each self-contained N number of symbol of this known signal, r _irepresent i-th symbol in this input signal, s _irepresent i-th symbol in this known signal, s _2jsame phase constituent identical with orthogonal component size and positive and negative identical, s _2j+1same phase constituent identical with orthogonal component size and on the contrary positive and negative, N be greater than 1 integer, the integer index that i is scope between 0 to (N-1), j is the integer index of scope between 0 to (N/2-1).

2. reversing spectrum judgment means as claimed in claim 1, is characterized in that, also comprise:

Single order time control module, the channel environment in order to pass through according to this input signal determines the order m1 that this differential correlator adopts, and this channel environment is poorer, and this control module selects larger order m1.

3. reversing spectrum judgment means as claimed in claim 1, it is characterized in that, this differential correlator also produces the one second differential motion relevant result d corresponding to different odd order _m2; And

This judge module is according to this first differential motion relevant result d _m1phase place and this second differential motion relevant result d _m2phase place judge whether this input signal exists this reversing spectrum situation.

4. reversing spectrum judgment means as claimed in claim 3, it is characterized in that, this judge module is according to this first differential motion relevant result d _m1absolute value and this second differential motion relevant result d _m2absolute value judge whether this input signal is this echo signal.

5. reversing spectrum judgment means as claimed in claim 1, is characterized in that, also comprise:

One context detection module, in order to detect the channel environment that this input signal passes through, determines whether produce the one second differential motion relevant result d corresponding to different odd order according to this _m2;

Wherein, if the determination result of this context detection module is yes, this differential correlator produces this second differential motion relevant result d _m2,

This judge module is according to this first differential motion relevant result d _m1phase place and this second differential motion relevant result d _m2phase place judge whether this input signal exists this reversing spectrum situation.

6. reversing spectrum judgment means as claimed in claim 5, it is characterized in that, this judge module is according to this first differential motion relevant result d _m1absolute value and this second differential motion relevant result d _m2absolute value judge whether this input signal is this echo signal.

7. reversing spectrum judgment means as claimed in claim 1, it is characterized in that, this differential correlator also produces one the 3rd differential motion relevant result d corresponding to an even number order _m3; And

This judge module is according to this first differential motion relevant result d _m1with the 3rd differential motion relevant result d _m3phase difference, judge whether this input signal exists this reversing spectrum situation.

8. reversing spectrum judgment means as claimed in claim 7, it is characterized in that, this judge module is according to this first differential motion relevant result d _m1absolute value and the 3rd differential motion relevant result d _m3absolute value, judge whether this input signal is this echo signal.

9. reversing spectrum judgment means as claimed in claim 1, it is characterized in that, this input signal comprises the initiation region content of a second generation Digital Television satellite broadcasting data frame.

10. reversing spectrum judgment means as claimed in claim 9, it is characterized in that, this known signal comprises the content meeting in this second generation Digital Television satellite broadcast standard and have about Frame initiation region.

11. reversing spectrum judgment means as claimed in claim 1, is characterized in that, are be applied in a digital baseband demodulating equipment, and this digital baseband demodulating equipment receives with this input signal of phase deviation modulation.

12. 1 kinds of reversing spectrum determination methods, comprise following steps:

A () imposes the differential related operation of odd number order to an input signal and a known signal, to produce one first differential motion relevant result d _m1; And

B () is judged as the echo signal corresponding to this known signal, according to this first differential motion relevant result d when this input signal _m1phase place judge whether this input signal exists a reversing spectrum situation, wherein, between step (a) and step (b), comprise following steps further: according to this first differential motion relevant result d _m1absolute value judge whether this input signal is this echo signal, wherein, the differential related operation of this odd number order comprises:

Wherein, it is odd number that odd number order represents order m1, this input signal and each self-contained N number of symbol of this known signal, r _irepresent i-th symbol in this input signal, s _irepresent i-th symbol in this known signal, s _2jsame phase constituent identical with orthogonal component size and positive and negative identical, s _2j+1same phase constituent identical with orthogonal component size and on the contrary positive and negative, N be greater than 1 integer, the integer index that i is scope between 0 to (N-1), j is the integer index of scope between 0 to (N/2-1).

13. reversing spectrum determination methods as claimed in claim 12, is characterized in that, comprise in taking a step forward of step (a):

The order m1 that channel environment deciding step (a) passed through according to this input signal adopts, this channel environment is poorer, selects larger order m1.

14. reversing spectrum determination methods as claimed in claim 12, is characterized in that, step (a) comprises generation one second differential motion relevant result d further _m2; And

Step (b) is according to this first differential motion relevant result d _m1phase place and this second differential motion relevant result d _m2phase place judge whether this input signal exists this reversing spectrum situation.

15. reversing spectrum determination methods as claimed in claim 14, is characterized in that, between step (a) and step (b), comprise following steps further: according to this first differential motion relevant result d _m1absolute value and this second differential motion relevant result d _m2absolute value, judge whether this input signal is this echo signal.

16. reversing spectrum determination methods as claimed in claim 12, is characterized in that, comprise further:

According to the channel environment that this input signal passes through, determine the one second differential motion relevant result d whether produced corresponding to different odd order _m2; If so, this second differential motion relevant result d is produced _m2, and step (b) is according to this first differential motion relevant result d _m1phase place and this second differential motion relevant result d _m2phase place, judge whether this input signal exists this reversing spectrum situation.

17. reversing spectrum determination methods as claimed in claim 16, is characterized in that, between step (a) and step (b), comprise following steps further: according to this first differential motion relevant result d _m1absolute value and this second differential motion relevant result d _m2absolute value judge whether this input signal is this echo signal.

18. reversing spectrum determination methods as claimed in claim 12, is characterized in that, step (a) comprises one the 3rd differential motion relevant result d producing and correspond to an even number order further _m3, and step (b) is according to this first differential motion relevant result d _m1with the 3rd differential motion relevant result d _m3phase difference judge whether this input signal exists this reversing spectrum situation.

19. reversing spectrum determination methods as claimed in claim 18, is characterized in that, comprise further between step (a) and step (b):

According to this first differential motion relevant result d _m1absolute value and the 3rd differential motion relevant result d _m3absolute value judge whether this input signal is this echo signal.

20. reversing spectrum determination methods as claimed in claim 12, is characterized in that, this input signal comprises the initiation region of a second generation Digital Television satellite broadcasting data frame.