CN101447837B - Single-carrier signal detection method and device - Google Patents

Abstract

The embodiment of the invention relates to a single-carrier signal detection method and a device. The method comprises the following steps: acquiring a channel impulse response corresponding to a single-carrier signal according to the received single-carrier signal; subjecting the single-carrier signal and the channel impulse response to difference treatment respectively to obtain the single-carrier signal difference result and the channel impulse response difference result; and determining whether a dual-pilot signal is loaded in the single-carrier signal according to the single-carrier signal difference result and the channel impulse response difference result. The embodiment can determine whether the dual-pilot signal is loaded in the single-carrier signal after subjecting the single-carrier signal and the channel impulse response to difference operation when the single-carrier signal is determined as the single-carrier signal.

Description

Single-carrier signal detection method and device

Technical field

The embodiment of the invention relates to wireless communication technology field, particularly a kind of single-carrier signal detection method and device.

Background technology

In wireless communication system; Because the carrier frequency difference of transmitter and receiver causes carrier frequency offset; The sampling clock frequency difference of transmitter and receiver causes sample clock frequency deviation, thereby influences the system receiver performance, causes higher bit error rate.In order to guarantee to transmit the reliable reception of data, need carry out the synchronous of carrier frequency and sampling clock frequency at receiver end.The pilot signal of can utilizing synchronously of carrier frequency and sampling clock frequency is accomplished on the digital receiver; Transmitter carries out coded modulation to digital signal earlier; Add synchronizing signal and pilot signal etc. again, functions such as the auxiliary figure receiver is realized synchronously, equilibrium and demodulation.

China Digital TV ground multimedia broadcasting (Digital Television TerrestrialMultimedia Broadcasting hereinafter to be referred as: DTMB); When channel condition is relatively poor; In order to carry out carrier frequency and sampling clock Frequency Synchronization quickly and accurately; Can adopt the double pilot technology, transmitter adds the double pilot signal in transmitting, and receiver utilizes the double pilot signal to carry out carrier frequency and sampling clock Frequency Synchronization.Because in DTMB, whether to insert the double pilot signal under the single carrier mode is optional, promptly the single-carrier signal that receives of receiver might not comprise the double pilot signal.And the DTMB receiver carries out utilize DFF to carry out channel equalization usually, and equilibrium result need removing the double pilot signal before symbol judgement when synchronous under single carrier mode.If do not have the double pilot signal in the signal that therefore receives, and receiver utilizes the double pilot signal to carry out the synchronous of carrier frequency and sampling clock frequency, then just be equivalent in synchronizing process introducing interference signal.

In realizing process of the present invention; The inventor finds to have following problem in the prior art at least: when receiver receives single-carrier signal; Directly utilize the double pilot signal to carry out the synchronous of sampling clock frequency and carrier frequency,, then can introduce interference signal if do not insert the double pilot signal in the single-carrier signal; Cause synchronization accuracy to reduce, and cause the power consumption of receiver to increase.

Summary of the invention

The embodiment of the invention provides a kind of single-carrier signal detection method and device, can judge whether be loaded with the double pilot signal in the single-carrier signal.

The embodiment of the invention provides a kind of single-carrier signal detection method, comprising:

Obtain the channel impulse response corresponding according to the single-carrier signal that receives with said single-carrier signal;

Respectively said single-carrier signal and said channel impulse response are carried out difference processing, obtain single-carrier signal difference result and channel impulse response difference result;

According to said single-carrier signal difference result and channel impulse response difference result, judge whether be loaded with the double pilot signal in the said single-carrier signal.

The embodiment of the invention provides a kind of single-carrier signal checkout gear again, comprising:

Receiver module is used for obtaining the channel impulse response corresponding with said single-carrier signal according to the single-carrier signal that receives;

The difference processing module is used for respectively said single-carrier signal and said channel impulse response being carried out difference processing, obtains single-carrier signal difference result and channel impulse response difference result;

Judge module is used for according to said single-carrier signal difference result and channel impulse response difference result, judges whether be loaded with the double pilot signal in the said single-carrier signal.

The embodiment of the invention provides a kind of single-carrier signal detection method and device, when single-carrier signal is single-carrier signal, detects whether be loaded with the double pilot signal in the single-carrier signal according to single-carrier signal and channel impulse response.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the flow chart of single-carrier signal detection method embodiment of the present invention;

Fig. 2 is the structural representation of single-carrier signal checkout gear first embodiment of the present invention;

Fig. 3 is the structural representation of single-carrier signal checkout gear second embodiment of the present invention.

Embodiment

To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.

Channel Transmission modulation in the DTMB standard has two kinds of mode of operations: multi-carrier mode and single carrier mode, and the DTMB signal frame is made up of frame head and frame two parts, and frame head partly is by binary pseudo-random sequence (Pseudo-random Noise; Hereinafter to be referred as: the PN sequence) constitute.The receiver of DTMB utilizes frame head PN sequence to carry out the synchronous of sampling clock frequency, carrier frequency and signal frame, and auxiliary frequency domain or the time domain equalization of carrying out.Under single carrier mode,, adopt double pilot (Dual-Pilot) technology in order to improve system carrier frequency and the isosynchronous reliability of sampling clock frequency.The double pilot technology is meant that it is the double pilot signal that the base band data that forms behind the framing is inserted two pilot signals in " ± 0.5 " character rate position, and the gross power of two pilot signals is " 16dB " with respect to the gross power of data.The mode of inserting the double pilot signal is first symbol data (being numbered " 0 ") since the day frame, to the real part of odd number symbols data add " 1 ", imaginary part adds " 0 ", the real part of dual numbers symbol data adds " 1 ", imaginary part adds " 0 ".

Fig. 1 is the flow chart of single-carrier signal detection method embodiment of the present invention, and as shown in Figure 1, this single-carrier signal detection method may further comprise the steps:

The single-carrier signal that step 101, basis receive obtains the channel impulse response corresponding with said single-carrier signal.

After the receiver of DTMB receives signal; Carrier mode detection module in the receiver; Can carry out related calculation according to signal that receives and local PN sequence, obtain channel impulse response h (i), and whether be single-carrier signal according to certain rule judgment current demand signal.If current demand signal is a single-carrier signal, detect whether be loaded with the double pilot signal in this single-carrier signal again, if current demand signal is a multi-carrier signal, then change the multicarrier handling process over to.The embodiment of the invention is to be under the situation of single-carrier signal at current demand signal, and this signal is handled, and judges whether this signal is loaded with the double pilot signal.Wherein receiver receives single-carrier signal whether to be loaded with the double pilot signal relevant with transmitting of transmitter.If do not have the double pilot signal in the transmitting of transmitter, there is not the double pilot signal in the single-carrier signal that then receiver receives yet, wherein there be not n symbol data of the single-carrier signal of double pilot signal to satisfy formula (1); Be loaded with the double pilot signal in if transmit, then also be loaded with the double pilot signal in the single-carrier signal, n the symbol data that is loaded with the single-carrier signal of double pilot signal satisfies formula (2).

$y\left(n\right)=\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)x(n-i)+w\left(n\right)---\left(1\right)$

X (n) is transmit n symbol data of frame data of transmitter, N in the formula (1) _hBe channel length, h (i) is a channel impulse response, and w (n) is a white Gaussian noise, n, N _h, i is integer.

$y\left(n\right)=\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)(x(n-i)+{(-1)}^{m-i})+w\left(n\right)---\left(2\right)$

In the formula (2), if be loaded with the double pilot signal in transmitting, the phase place of the double pilot signal that then x (n) is corresponding is (1) ^m, m is " 0 " or " 1 ", the symbol data that transmits after the loading double pilot is x (n)+(1) ^m

Step 102, respectively said single-carrier signal and said channel impulse response are carried out difference processing, obtain single-carrier signal difference result and channel impulse response difference result.

Utilize formula (3) to carry out difference processing, obtain the single-carrier signal difference result single-carrier signal:

$Y_{\mathrm{dM}}=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}y(n+j)---\left(3\right)$

Y in the formula (3) _DMBe the single-carrier signal difference result, y (n) is a n symbol data of single-carrier signal, and M is the data length of the said single-carrier signal of a frame, and M, j, n are integer.

Utilize formula (4) to carry out difference processing, obtain the channel impulse response difference result channel impulse response:

$H_d=\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^i---\left(4\right)$

H in the formula (4) _dBe said channel impulse response difference result, h (i) is said channel impulse response, N _hBe channel length, i is an integer.According to formula (4) channel impulse response h (i) being carried out difference and add up, is in order to eliminate the influence of channel impulse response in testing result.

Owing to possibly not load the double pilot signal in the single-carrier signal, also possibly be loaded with the double pilot signal, therefore divide two kinds of situation to derive.

Situation one if do not load the double pilot signal in the single-carrier signal, then can obtain single-carrier signal difference result Y according to formula (1) and formula (3) _DM, Y _DMSatisfy formula (5).

$Y_{\mathrm{dM}}=y\left(n\right)-y(n+1)+y(n+2)-y(n+3)...+{(-1)}^{M}y(n+M-1)$

$=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}y(n+j)$

$=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^j\{\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)x(n+j-i)+w(n+j)\}---\left(5\right)$

$=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^j\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)x(n+j-i)+\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}w(n+j)$

Can know by formula (5), because the difference statistics characteristic of white Gaussian noise w (n) is tending towards " 0 ", so the difference accumulation result of white Gaussian noise w (n) $\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}w(n+j)\≈0,$ Y (n) is carried out difference to add up and can eliminate the influence of w (n) in testing result.And because the difference statistics characteristic of the symbol data x (n) that transmits also is tending towards " 0 ", therefore $\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^j\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)x(n+j-i)\≈0,$ Y (n) is carried out difference to add up and can eliminate the influence of x (n) in testing result.So the single-carrier signal that does not load the double pilot signal is carried out after difference adds up the single-carrier signal difference result Y of acquisition _DMBe a minimum value even level off to " 0 ".

Situation two if be loaded with the double pilot signal in the single-carrier signal, then can obtain single-carrier signal difference result Y according to formula (2) and formula (3) _DM, Y _DMSatisfy formula (6).

$Y_{\mathrm{dM}}=y\left(n\right)-y(n+1)+y(n+2)-y(n+3)...+{(-1)}^{M}y(n+M-1)$

$=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}y(n+j)$

$=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^j\{\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)(x(n+j-i)+{(-1)}^{m+j-i})+w(n+j)\}---\left(6\right)$

$=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^j\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)x(n+j-i)+\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}w(n+j)+\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^{m+2j-i}$

Can know by formula (6), because the difference statistics characteristic of symbol data x (n) that transmits and white Gaussian noise w (n) is tending towards " 0 ", so $\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^j\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)x(n+j-i)\≈0$ And $\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}w(n+j)\≈0.$ Promptly y (n) being carried out difference adds up and can eliminate x (n) and the influence of w (n) in testing result.But because the data length M of a frame single-carrier signal of DTMB single-carrier signal is enough big, M is generally " 595+3780 " individual symbol data, so even the difference statistics characteristic of symbol data x (n) that transmits and w (n) is tending towards " 0 ", Y _DMDo not level off to " 0 ", with Y yet _DMIn comprise x (n) and w (n) item eliminate after, can obtain formula (7) according to formula (4) again.

$Y_{\mathrm{dM}}=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^j\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right)x(n+j-i)+\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}w(n+j)+\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^{m+2j-i}$

$\≈\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^{m+2j-i}$

$={(-1)}^m\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^i---\left(7\right)$

$={(-1)}^{m}M\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^i$

$={(-1)}^m{\mathrm{MH}}_d$

Can know by formula (7), if y (n) in be loaded with the double pilot signal, then eliminate x (n) and the influence of w (n) in testing result after, the single-carrier signal difference result Y that obtains _DMIn fact with channel impulse response difference result H _dRelevant.And because channel impulse response h (i) can be when receiver obtains y (n), carrying out related calculation through single-carrier signal and local PN sequence obtains, so h (i) is equivalent to known.Utilize above-mentioned formula (4) to carry out obtaining channel impulse response difference result H after the difference processing to channel impulse response h (i) _d

Step 103, according to said single-carrier signal difference result and channel impulse response difference result, judge whether be loaded with the double pilot signal in the said single-carrier signal.

Utilize formula (8) to carry out the conjugation processing, obtain decision signal single-carrier signal difference result and channel impulse response difference result:

$R_d=Y_{\mathrm{dM}}\×H_d^{*}---\left(8\right)$

R in the formula (8) _dBe decision signal, H _d ^*Be channel impulse response difference result H _dConjugate complex number.With Y _DMWith H _dConjugate multiplication has been eliminated the influence of channel impulse response in testing result.

In situation a period of time of step 102, as if the Y that obtains according to formula (3) _DMBe a minimum value even level off to " 0 ", then can directly judge to draw not load the double pilot signal in this single-carrier signal, do not carry out follow-up processing; Also can carry out obtaining the channel impulse response difference result after the difference processing to channel impulse response, and single-carrier signal difference result and channel impulse response difference result carried out obtaining decision signal R after conjugation is handled according to formula (8) according to formula (4) _d, then according to decision signal R _dJudge.

When the situation two of step 102, as if the Y that obtains according to formula (3) _DMDo not level off to " 0 " or when very big, possibly be loaded with the double pilot signal in the single-carrier signal, according to formula (8) to single-carrier signal difference result Y _DMWith channel impulse response difference result H _dCarry out conjugation and handle, just can obtain decision signal R _d, this moment R _dSatisfy formula (9).

$R_d=Y_{\mathrm{dM}}\×H_d^{*}\≈{(-1)}^{m}M{\left|H_d\right|}^2---\left(9\right)$

Result of calculation (1) according to formula (9) ^mM|H _d| ²Be a real number, be equivalent to the real part of decision signal, at this moment M|H _d| ²Be R _dThe amplitude of real part is absolute value just, (1) ^mBe R _dThe symbol of real part.Possibly have the certain interference signal or the error of calculation in the actual calculation process, the decision signal that calculates according to formula (9) can be plural number or real number, thus the real part of decision signal near but be not limited to (1) ^mM|H _d| ²Be (1) with the decision signal real part below ^mM|H _d| ²The time be the explanation that example is carried out deterministic process.

According to single-carrier signal difference result and channel impulse response difference result, judge that the method that whether is loaded with the double pilot signal in the single-carrier signal is: according to decision signal R in the formula (9) _dReal part (1) ^mM|H _d| ²Judge, if R _dReal part (1) ^mM|H _d| ²Amplitude M|H _d| ²Greater than the threshold value that is provided with, then can judge to be loaded with the double pilot signal in the single-carrier signal, also be loaded with the double pilot signal in the transmitting of transmitter.Wherein threshold value can obtain based on empirical value, also can be based on concrete applied environment, and obtain after process calculating, the emulation, and be arranged in the receiver in advance.When the amplitude of the real part of decision signal is explained during greater than the threshold value that is provided with: after eliminating the influence of the symbol data that transmits, channel impulse response and white Gaussian noise in the single-carrier signal; Also there is enough big cumulative signal; Cumulative signal that should be enough big is because also being loaded with the double pilot signal in the transmitting of transmitter produces, so can judge and be loaded with the double pilot signal in the single-carrier signal.

If according to said single-carrier signal difference result and channel impulse response difference result; Judge and to learn and be loaded with the double pilot signal in the said single-carrier signal that the method for then obtaining the phase place of said double pilot signal according to single-carrier signal difference result and channel impulse response difference result is: as if decision signal R _dReal part (1) ^mM|H _d| ²Symbol (1) ^mFor just, promptly m is " 0 ", and the phase place of the double pilot signal that then n the symbol data y (n) of single-carrier signal is corresponding is " 1 "; (if 1) ^mM|H _d| ²Symbol (1) ^mFor negative, promptly m is " 1 ", and the phase place of the double pilot signal that then n the symbol data y (n) of single-carrier signal is corresponding is " 1 ".

According to aforementioned calculation and deterministic process; Can receiver carry out sampling clock frequency and/or carrier frequency synchronously before; Judge and whether be loaded with the double pilot signal in the single-carrier signal; If be loaded with the double pilot signal in the single-carrier signal, also just inserted the double pilot signal in the transmitting of transmitter.Be loaded with in the single-carrier signal under the situation of double pilot signal, that utilizes that the double pilot signal carries out sampling clock frequency and/or carrier frequency can obtain synchronized result accurately synchronously.If do not insert the double pilot signal in transmitting; Then close and utilize the double pilot signal to carry out the synchronous functional module of sampling clock frequency and/or carrier frequency, directly utilize the PN sequence etc. of the frame head data that other data for example transmit carry out sampling clock frequency and/or carrier frequency synchronously.

Present embodiment is when single carrier mode; Receiver carries out after difference etc. handles single-carrier signal and channel impulse response; Can judge whether be loaded with the double pilot signal in the single-carrier signal, just utilize the double pilot signal to carry out the synchronous of sampling clock frequency and/or carrier frequency when in single-carrier signal, being loaded with the double pilot signal.In transmitting, do not have under the situation of double pilot signal, receiver do not utilize the double pilot signal carry out sampling clock frequency and/or carrier frequency synchronously, thereby reduced the power consumption of receiver, reduced the interference of introducing when synchronous, improved synchronization accuracy.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

Fig. 2 is the structural representation of single-carrier signal checkout gear first embodiment of the present invention, and as shown in Figure 2, this single-carrier signal checkout gear comprises: receiver module 1, difference processing module 2 and judge module 3.Wherein receiver module 1 is used for obtaining the channel impulse response corresponding with said single-carrier signal according to the single-carrier signal that receives; Difference processing module 2 is used for respectively said single-carrier signal and said channel impulse response being carried out difference processing, obtains single-carrier signal difference result and channel impulse response difference result; Judge module 3 is used for according to said single-carrier signal difference result and channel impulse response difference result, judges whether be loaded with the double pilot signal in the said single-carrier signal.

Particularly; After the receiver of DTMB received signal, the carrier mode detection module in the receiver can carry out related calculation according to signal that receives and local PN sequence; Obtain channel impulse response h (i), and judge according to this h (i) whether current demand signal is single-carrier signal.If current demand signal is a single-carrier signal, detect whether be loaded with the double pilot signal in this single-carrier signal again, if current demand signal is a multi-carrier signal, then change the multicarrier handling process over to.Present embodiment and single-carrier signal detection method of the present invention are based on same design; Be to be under the situation of single-carrier signal in the single-carrier signal that receives; The device that single-carrier signal is detected, so the calculating process of each module of present embodiment can utilize the formula among the single-carrier signal detection method embodiment of the present invention to describe.Receiver module 1 can obtain the channel impulse response corresponding with said single-carrier signal according to the single-carrier signal that receives, and wherein n the symbol data y (n) of single-carrier signal satisfies formula (1) or the formula (2) among the single-carrier signal detection method embodiment of the present invention.Difference processing module 2 is utilized formula (3) that single-carrier signal is carried out difference processing and is obtained the single-carrier signal difference result; If single-carrier signal does not have the double pilot signal, the single-carrier signal difference result satisfies formula (5); If single-carrier signal is loaded with the double pilot signal, the single-carrier signal difference result satisfies formula (6).Difference processing module 2 is utilized formula (4) that channel impulse response is carried out difference processing and is obtained the channel impulse response difference result.Difference processing module 2 utilizes formula (8) that single-carrier signal difference result and channel impulse response difference result are carried out the conjugation processing, obtains decision signal.If decision signal satisfies formula (9), and the amplitude of the real part of decision signal then is loaded with the double pilot signal in the judge module 3 judgement single-carrier signal greater than the threshold value that is provided with in advance.Wherein judge module judges that according to decision signal the process of the double pilot signal phase that whether is loaded with the double pilot signal in the single-carrier signal and obtains loading can repeat no more at this referring to description among the single-carrier signal detection method embodiment of the present invention and formula (1)-(9).

Present embodiment is when single carrier mode; Single-carrier signal obtains receiver module and the channel impulse response of single-carrier signal according to receiving; After the difference processing module was carried out difference processing to single-carrier signal and channel impulse response respectively, judge module judged to learn whether be loaded with the double pilot signal in the single-carrier signal according to the result of difference processing.

Fig. 3 is the structural representation of single-carrier signal checkout gear second embodiment of the present invention, and as shown in Figure 3, on the basis of single-carrier signal checkout gear first embodiment of the present invention, difference processing module 2 comprises single-carrier signal difference processing unit 21.Single-carrier signal difference processing unit 21 is used to utilize formula $Y_{\mathrm{DM}}=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}y(n+j)$ Said single-carrier signal is carried out difference processing, obtain the single-carrier signal difference result, wherein Y _DMBe said single-carrier signal difference result, y (n) is a n symbol data of said single-carrier signal, and M is the data length of the said single-carrier signal of a frame, and M, j, n are integer.Difference processing module 2 can also comprise channel impulse response difference processing unit 23 further.Channel impulse response difference processing unit 23 is used to utilize formula $H_d=\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^i$ Said channel impulse response is carried out difference processing, obtain the channel impulse response difference result, wherein H _dBe said channel impulse response difference result, h (i) is said channel impulse response, N _hBe channel length, i is an integer.Judge module 3 can comprise the conjugation processing unit 31 and first judging unit 32.Wherein conjugation processing unit 31 is used to utilize formula $R_d=Y_{\mathrm{DM}}\×H_d^{*}$ Said single-carrier signal difference result and channel impulse response difference result are carried out the conjugation processing, obtain decision signal, wherein R _dBe said decision signal, H _d ^*Be said channel impulse response difference result H _dConjugate complex number; If first judging unit 32 is used for said decision signal and R _dThe amplitude of real part is then judged to be loaded with the double pilot signal in the said single-carrier signal greater than the threshold value that is provided with.Further, this single-carrier signal checkout gear also comprises: acquisition module 4.Acquisition module 4 is used for if said single-carrier signal is loaded with the double pilot signal, then obtains the phase place of said double pilot signal according to said single-carrier signal difference result and channel impulse response difference result.After the conjugation processing unit 31 and first judging unit 32 calculated decision signal, if acquisition module 4 also is used for said decision signal R _dThe symbol of real part is for just, and the phase place of the double pilot signal that then n symbol data of said single-carrier signal is corresponding be " 1 ", as if said decision signal R _dThe symbol of real part is for negative, and the phase place of the double pilot signal that then n symbol data of said single-carrier signal is corresponding is " 1 ".

Particularly; Under the single carrier mode of DTMB standard; Single-carrier signal is a single-carrier signal, and after receiver module 1 can obtain the channel impulse response corresponding with said single-carrier signal according to the single-carrier signal that receives, single-carrier signal difference processing unit 21 utilized formula $Y_{\mathrm{DM}}=\underset{j=0}{\overset{M-1}{\mathrm{\Σ}}}{(-1)}^{j}y(n+j)$ Be that formula (3) among the single-carrier signal detection method embodiment of the present invention carries out difference processing to single-carrier signal, obtain the single-carrier signal difference result.Channel impulse response difference processing unit 23 utilizes formula $H_d=\underset{i=0}{\overset{N_h}{\mathrm{\Σ}}}h\left(i\right){(-1)}^i$ Be that formula (4) among the single-carrier signal detection method embodiment of the present invention carries out difference processing to channel impulse response, obtain the channel impulse response difference result.The conjugation processing unit 31 of judge module 3 utilizes formula $R_d=Y_{\mathrm{DM}}\×H_d^{*}$ Be that formula (5) among the single-carrier signal detection method embodiment of the present invention carries out conjugation to single-carrier signal difference result and channel impulse response difference result and handles, obtain decision signal.First judging unit 32 judges whether be loaded with the double pilot signal in the single-carrier signal according to the amplitude of decision signal real part; If the amplitude of single-carrier signal real part is during greater than the threshold value that is provided with, first judging unit 32 can be judged and is loaded with the double pilot signal in the single-carrier signal.Acquisition module 4 is according to the phase place of the symbol decision double pilot signal of decision signal real part then; If the symbol of decision signal real part is for just; The phase place of the double pilot signal that then n the symbol data y (n) of said single-carrier signal is corresponding is " 1 "; If the symbol of said decision signal real part is for negative, the phase place of the double pilot signal that then n the symbol data y (n) of said single-carrier signal is corresponding is " 1 ".Wherein present embodiment single carrier checkout gear judges that according to decision signal the process of the double pilot signal phase that whether is loaded with the double pilot signal in the single-carrier signal and obtains loading can repeat no more at this referring to description among the single-carrier signal detection method embodiment of the present invention and formula (1)-(9).

Further, this single-carrier signal checkout gear also comprises synchronization module 5, is used for if said single-carrier signal is loaded with said double pilot signal, then utilizes said double pilot signal to carry out the synchronous of sampling clock frequency and/or carrier frequency; Otherwise the frame head data of utilizing said single-carrier signal is carried out the synchronous of sampling clock frequency and/or carrier frequency.The single-carrier signal checkout gear carry out sampling clock frequency and/or carrier frequency synchronously before; Can detect and whether be loaded with the double pilot signal in the single-carrier signal; If be loaded with the double pilot signal in the single-carrier signal, then synchronization module 5 can utilize the double pilot signal to carry out the synchronous of sampling clock frequency and/or carrier frequency.If there is not the double pilot signal in the single-carrier signal, then synchronization module 5 can utilize single-carrier signal or the frame head data that transmits etc. carry out sampling clock frequency and/or carrier frequency synchronously.

Present embodiment carries out after difference processing, channel impulse response difference processing unit carry out difference processing to channel impulse response single-carrier signal through single-carrier signal difference processing unit; The conjugation processing unit carries out the conjugation processing to difference result and obtains decision signal; First judging unit judges whether be loaded with the double pilot signal in the single-carrier signal according to decision signal then, if be loaded with the double pilot signal then acquisition module judge the phase place of double pilot signal according to decision signal.When in single-carrier signal, being loaded with the double pilot signal; Synchronization module can utilize the double pilot signal to carry out the synchronous of sampling clock frequency and/or carrier frequency, otherwise synchronization module does not adopt the method for synchronization of double pilot signal to carry out the synchronous of sampling clock frequency and/or carrier frequency.In single-carrier signal, do not have under the situation of double pilot signal, synchronization module then do not adopt the double pilot signal carry out sampling clock frequency and/or carrier frequency synchronously, thereby reduced the power consumption of receiver, reduced the interference when synchronous, improved synchronous precision.

What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.

Claims (14)

1. a single-carrier signal detection method is characterized in that, comprising:

Obtain the channel impulse response corresponding according to the single-carrier signal that receives with said single-carrier signal;

Respectively said single-carrier signal and said channel impulse response are carried out difference processing, obtain single-carrier signal difference result and channel impulse response difference result;

According to said single-carrier signal difference result and channel impulse response difference result, judge whether be loaded with the double pilot signal in the said single-carrier signal.

2. single-carrier signal detection method according to claim 1; It is characterized in that; Also comprise:, then obtain the phase place of said double pilot signal according to said single-carrier signal difference result and channel impulse response difference result if be loaded with the double pilot signal in the said single-carrier signal.

3. single-carrier signal detection method according to claim 2 is characterized in that, said single-carrier signal is carried out difference processing, comprising:

Utilize formula

Said single-carrier signal is carried out difference processing, obtain the single-carrier signal difference result, wherein Y _DMBe said single-carrier signal difference result, y (n) is a n symbol data of said single-carrier signal, and M is the data length of the said single-carrier signal of a frame, and M, j, n are integer.

4. single-carrier signal detection method according to claim 3 is characterized in that, said channel impulse response is carried out difference processing, comprising:

Utilize formula Said channel impulse response is carried out difference processing, obtain the channel impulse response difference result, wherein H _dBe said channel impulse response difference result, h (i) is said channel impulse response, N _hBe channel length, i is an integer.

5. single-carrier signal detection method according to claim 4 is characterized in that, and is said according to said single-carrier signal difference result and channel impulse response difference result, judges whether be loaded with the double pilot signal in the said single-carrier signal, comprising:

Utilize formula

Said single-carrier signal difference result and channel impulse response difference result are carried out the conjugation processing, obtain decision signal, wherein R _dBe said decision signal, H _d ^*Be said channel impulse response difference result H _dConjugate complex number;

If said decision signal R _dThe amplitude of real part is then judged to be loaded with the double pilot signal in the said single-carrier signal greater than the threshold value that is provided with.

6. single-carrier signal detection method according to claim 5; It is characterized in that; Be loaded with the double pilot signal in the said if said single-carrier signal, then obtain the phase place of said double pilot signal, comprising according to said single-carrier signal difference result and channel impulse response difference result:

If said decision signal R _dThe symbol of real part is for just, and the phase place of the double pilot signal that then n symbol data of said single-carrier signal is corresponding be " 1 ", as if said decision signal R _dThe symbol of real part is for negative, and the phase place of the double pilot signal that then n symbol data of said single-carrier signal is corresponding is " 1 ".

7. according to claim 1 or 4 or 5 or 6 described single-carrier signal detection methods, it is characterized in that, also comprise:

If be loaded with said double pilot signal in the said single-carrier signal, then utilize said double pilot signal to carry out the synchronous of sampling clock frequency and/or carrier frequency; Otherwise the frame head data of utilizing said single-carrier signal is carried out the synchronous of sampling clock frequency and/or carrier frequency.

8. a single-carrier signal checkout gear is characterized in that, comprising:

Receiver module is used for obtaining the channel impulse response corresponding with said single-carrier signal according to the single-carrier signal that receives;

The difference processing module is used for respectively said single-carrier signal and said channel impulse response being carried out difference processing, obtains single-carrier signal difference result and channel impulse response difference result;

Judge module is used for according to said single-carrier signal difference result and channel impulse response difference result, judges whether be loaded with the double pilot signal in the said single-carrier signal.

9. single-carrier signal checkout gear according to claim 8 is characterized in that, also comprises:

Acquisition module is used for if said single-carrier signal is loaded with the double pilot signal, then obtains the phase place of said double pilot signal according to said single-carrier signal difference result and channel impulse response difference result.

10. single-carrier signal checkout gear according to claim 9 is characterized in that, said difference processing module comprises:

Single-carrier signal difference processing unit is used to utilize formula Said single-carrier signal is carried out difference processing, obtain the single-carrier signal difference result, wherein Y _DMBe said single-carrier signal difference result, y (n) is a n symbol data of said single-carrier signal, and M is the data length of the said single-carrier signal of a frame, and M, j, n are integer.

11. single-carrier signal checkout gear according to claim 10 is characterized in that, said difference processing module also comprises:

Channel impulse response difference processing unit is used to utilize formula Said channel impulse response is carried out difference processing, obtain the channel impulse response difference result, wherein H _dBe said channel impulse response difference result, h (i) is said channel impulse response, N _hBe channel length, i is an integer.

12. single-carrier signal checkout gear according to claim 11 is characterized in that, said judge module comprises:

The conjugation processing unit is used to utilize formula Said single-carrier signal difference result and channel impulse response difference result are carried out the conjugation processing, obtain decision signal, wherein R _dBe said decision signal, H _d ^*Be said channel impulse response difference result H _dConjugate complex number;

If first judging unit is used for said decision signal R _dThe amplitude of real part is greater than the threshold value that is provided with, and then judges in the single-carrier signal of n symbol data correspondence of said single-carrier signal to be loaded with the double pilot signal.

13. single-carrier signal checkout gear according to claim 12 is characterized in that, said acquisition module also is used for obtaining according to following method the phase place of said double pilot signal:

If said decision signal R _dThe symbol of real part is for just, and the phase place of then said double pilot signal is " 1 ", if said decision signal R _dThe symbol of real part is for negative, and the phase place of the double pilot signal that then n symbol data of said single-carrier signal is corresponding is " 1 ".

14. according to Claim 8 or 9 or 11 or 12 or 13 described single-carrier signal checkout gears, it is characterized in that, also comprise:

Synchronization module is used for if said single-carrier signal is loaded with said double pilot signal, then utilizes said double pilot signal to carry out the synchronous of sampling clock frequency and/or carrier frequency; Otherwise the frame head data of utilizing said single-carrier signal is carried out the synchronous of sampling clock frequency and/or carrier frequency.

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