CN102668426A

CN102668426A - Digital broadcast reception apparatus and delay profile generation method

Info

Publication number: CN102668426A
Application number: CN2010800530099A
Authority: CN
Inventors: 村田聪; 梅野良辅; 竹内满
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2010-01-18
Filing date: 2010-01-18
Publication date: 2012-09-12
Anticipated expiration: 2030-01-18
Also published as: WO2011086609A1; DE112010005148T5; JPWO2011086609A1; DE112010005148B4; CN102668426B; JP4926307B2

Abstract

A digital broadcast reception apparatus offsets the detection time of incoming waves in a power-based delay profile so that the arrival times of the primary waves of the power-based delay profile and the SP-based delay profile match. In the SP-based delay profile, the values corresponding to the arrival times of values of a predetermined threshold or more, in the power-based delay profile of which the detected times of the incoming waves are offset, are left intact, while values corresponding to the arrival times of values less than the threshold are replaced with values not treated as incoming waves. The result is outputted as the delay profile of the received OFDM signal.

Description

Digital broacast receiver and delay distribution generation method

Technical field

(Orthogonal Frequency Division Multiplexing: OFDM) mode is come the digital broacast receiver of receiving digital broadcast ripple and is postponed (delay profile) the generation method that distributes to the present invention relates to use OFDM.

Background technology

In the OFDM mode, the information distribution that will send is carried out digital modulation to a plurality of subcarriers in each subcarrier.As digital modulation mode, can enumerate for example QPSK (Quadrature Phase Shift Keying: QPSK) mode, QAM (quadrature amplitude modulation: Quadrature Amplitude Modulation) mode or many-valued PSK (phase shift keying) mode etc.

In addition, in specific subcarrier, known signal is carried out multiplexedly,, utilize this known signal, subcarrier is carried out demodulation at receiver side.

On the other hand, utilize inverse Fourier transform to handle, have the subcarrier of known signal to carry out orthogonal transform, become the transmission frequency of expectation to transmit afterwards frequency inverted multiplexed.The transmission unit that will carry out this inverse Fourier transform processing is called code element.

The beginning of code element is duplicated and is appended at the rear portion of the signal after inverse Fourier transform handled.This additional part is known as protection (guard interval) at interval, is the incoming wave below the protection gap length even there is time of delay, also can reproducing signal in receiver side and code element between do not disturb.

If with in Japan received terrestrial digital broadcasting is that the DVB-T mode that adopt in ISDB-T mode or Europe is an example, scattered pilot (SP:Scattered Pilot) signal (below be called the SP signal) is arranged as being inserted into the known signal that sends in the signal in advance.With this SP signal period property be inserted into and send in the signal.

Receiver side have in advance periodically be inserted into send each the SP signal in the signal value as known SP signal; With the SP signal that receives divided by known SP signal, thereby can infer (below be called transmission line infer) to the undulate quantity of amplitude in each SP signal and phase place (below be called transmission line property).

In addition, carry out inverse Fourier transform through the value to this transmission line property, thereby can obtain to postpone to distribute, this postpones the intensity that the reception signal of each time of advent is represented in distribution.Here, the delay that will be called based on SP based on the delay distribution that the transmission line property value is obtained distributes.

As obtaining another method that postpones distribution, there is the method (for example, with reference to patent documentation 1) of utilizing the power spectrum that receives signal.In the method, in frequency domain, will receive signal and carry out square, carry out inverse Fourier transform after converting the power dimension to, and postpone to distribute thereby obtain.Here, the delay that this delay distribution is called based on power distributes.

If to establish effective Baud Length is Ts, the maximum delay time that can detect incoming wave in then distributing based on the delay of power becomes Ts/2, this is in distributing than the delay based on SP ± and time range that Ts/6 will grow.

But the problem that in the delay based on power distributes, exists has: it is poor for the relative time of main ripple with the delay phase of wave to obtain advance wave, and can not differentiate advance wave and postpone ripple.In addition, the problem that when having a plurality of incoming wave, exists has: incoming wave disturbs each other, thereby cross modulation takes place, on non-existent incoming wave appears at and postpones to distribute originally.

On the other hand; In patent documentation 2, disclose the OFDM ripple and postponed the measure of spread device; This OFDM ripple postpones delay that measure of spread device will utilize transfer function method and distributes and utilize the delay of power spectrum method to distribute to make up and use; Wherein, utilize the delay distribution of transfer function method to be equivalent to above-mentioned delay distribution, utilize the delay distribution of power spectrum method to be equivalent to distribute based on the delay of power based on SP.In this device; Through using two kinds of delays to distribute, can remove the following amount that postpones in the distribution determination method: can measure maximum delay time length, the temporal resolution that can measure the delay ripple that postpones ripple, the level that can measure the delay ripple, the precision that postpones the ripple level and false pulse response.

But; The problem of existence has for the incoming wave in only appearing at the delay distribution (delay based on SP distributes) that utilizes transfer function method: owing in statu quo exporting the pseudo-incoming wave that takes place in the time of therefore can not deleting the moving body high-speed mobile that is mounted with this receiving system as measuring the result.

In the OFDM receiving system that patent documentation 3 is put down in writing, judge through the pseudo-incoming wave that takes place when being mounted with the moving body high-speed mobile of this OFDM receiving system itself, thus the mistake control when preventing high-speed mobile.

But the time range that can detect incoming wave is limited in ± Ts/6, therefore has the problem that possibly miss control to long incoming wave time of delay.

In addition, the receiving system put down in writing of patent documentation 3 does not possess the function that correct delay that pseudo-incoming wave do not appear in output distributes.

The present invention accomplishes in order to address the above problem; Its purpose is to provide a kind of digital broacast receiver and postpones distribution generation method; Even this digital broacast receiver and delay distribution generation method are under the environment of the moving body high-speed mobile that is mounted with this device itself; Or in the delay based on SP distributes, exist under the situation of the incoming wave that surpasses the time range that can detect incoming wave, eliminate mistake control thereby also can provide the delay that does not have error to distribute, can improve receptivity.

The prior art document

Patent documentation

Patent documentation 1: the open patent 2005-268831 of Japan communique

Patent documentation 2: the open patent 2006-93760 of Japan communique

Patent documentation 3: the open patent 2008-72224 of Japan communique

Summary of the invention

Digital broacast receiver involved in the present invention comprises: Fourier transform portion, and this Fourier transform portion carries out Fourier transform to the orthogonal frequency-division multiplex singal that receives by each transmission unit; The sub-carrier power calculating part, this sub-carrier power calculating part calculates the sub-carrier power data according to the data of utilizing after Fourier transform portion carries out Fourier transform; The first inverse Fourier transform portion, this first inverse Fourier transform portion carries out inverse Fourier transform to the sub-carrier power data of utilizing the sub-carrier power calculating part and calculating, and postpones to distribute thereby generate first; Pilot signal extraction portion, this pilot signal extraction portion goes out pilot signal from the extracting data of utilizing Fourier transform portion to carry out after the Fourier transform; Division portion, this division portion will utilize pilot signal that pilot signal extraction portion extracts divided by given value, thereby calculate the transmission line property data for the pilot signal of each transmission unit; Insert portion in the time orientation, the transmission line property data for the pilot signal of each transmission unit that the portion that inserts in this time orientation will utilize that division portion calculates are slotting time orientation carries out in; The second inverse Fourier transform portion, this second inverse Fourier transform portion carries out inverse Fourier transform to utilize the transmission line property data after the portion that inserts in the time orientation inserts in time orientation carries out, and postpones to distribute thereby generate second; And the synthetic portion that postpones to distribute; This synthetic portion of delay distribution squints the detection time of the incoming wave that first delay distributes; So that by the first inverse Fourier transform portion generate first postpone to distribute and the time of advent of the second main ripple that postpones to distribute that generates by the second inverse Fourier transform portion consistent; And keep second in postpone distributing, with the corresponding value time of advent of value more than first the defined threshold in postponing to distribute that is squinted the detection time of said incoming wave; To replace to the value of not handling with the corresponding value time of advent, thereby distribute and export as the delay of the orthogonal frequency-division multiplex singal that receives less than the value of threshold value as incoming wave.

If adopt the present invention; Then can bring following effect: even under the environment of the moving body high-speed mobile that is mounted with device of the present invention itself; Or in the second delay distribution (delay based on SP distributes), exist under the situation of the incoming wave that surpasses scope detection time; Also can provide the delay that does not have error to distribute, thereby can eliminate mistake control, can improve receptivity as the delay distribution of the orthogonal frequency-division multiplex singal that receives.

Description of drawings

Fig. 1 is the figure of the configuration mode of expression SP signal in sending signal.

Fig. 2 is the figure that infers the result that is illustrated in the transmission line property of the SP signal after time orientation is inserted in carrying out.

Fig. 3 is the figure that infers the result that is illustrated in the transmission line property of the SP signal after time orientation and frequency direction are inserted in carrying out.

Fig. 4 is the figure of expression based on an example of the delay distribution of SP.

Fig. 5 is illustrated in the figure that infers the result that comprises the transmission line property of error in interior the inserting that time orientation carries out.

Fig. 6 is expression reaches the pseudo-incoming wave that wherein produces based on the delay distribution of SP figure.

Fig. 7 is the figure of expression based on an example of the caused problem of delay ripple that surpasses detection range in the delay distribution of SP.

Fig. 8 is the figure of expression based on an example of the delay distribution of power.

Fig. 9 is the block diagram of structure of the digital broacast receiver of expression execution mode 1 of the present invention.

Figure 10 is the distribute flow chart of flow process of the action that synthetic portion carried out of the delay of expression execution mode 1.

Figure 11 is the key diagram of the synthetic processing of the delay distribution in the explanation execution mode 1.

Figure 12 is the distribute flow chart of flow process of the action that synthetic portion carried out of the delay of expression execution mode 2.

Figure 13 is the key diagram of the synthetic processing of the delay distribution in the explanation execution mode 3.

Figure 14 is the block diagram of structure of the digital broacast receiver of expression execution mode 4 of the present invention.

Figure 15 is the block diagram of structure of the digital broacast receiver of expression execution mode 5 of the present invention.

Embodiment

Below, in order to illustrate in greater detail the present invention, the mode that is used for embodiment of the present invention is described according to accompanying drawing.

Execution mode 1

At first, to the SP signal in the transmission signal that is inserted into the OFDM mode, distributing and distribute based on the delay of power based on the delay of SP describes.

Fig. 1 is the figure of the configuration mode of expression SP signal in sending signal, and the black circle mark among Fig. 1 is represented the SP signal, and white circle mark is represented signals such as data.As shown in Figure 1, on time orientation to per 4 code elements, on frequency direction to per 12 carrier waves, decentralized configuration SP signal, and be configured to each code element respectively squint 3 carrier waves so that these insertion positions be the cycle, be positioned at same frequency position with 4 code elements.At receiver side with the SP signal that receives divided by known SP signal, thereby infer the transmission line property in each SP signal.

Fig. 2 is the figure that infers the result that is illustrated in the transmission line property of the SP signal after time orientation is inserted in carrying out; Black circle mark among Fig. 2 is represented the presumed value of the transmission line property of SP signal; Black triangle mark is illustrated in the presumed value of the transmission line property after time orientation is inserted in carrying out, and white circle mark is represented signals such as data.

In addition; Fig. 3 is the figure that infers the result that is illustrated in the transmission line property of the SP signal after time orientation and frequency direction are inserted in carrying out; Black circle mark among Fig. 3 is represented the presumed value of the transmission line property of SP signal; Black triangle mark is illustrated in the presumed value of the transmission line property after time orientation is inserted in carrying out, and the black box mark is illustrated in the presumed value of the transmission line property after frequency direction is inserted in carrying out.

That kind as shown in Figure 2 is inserted the presumed value of the transmission line property of SP signal in time orientation carries out after; That kind as shown in Figure 3 is further inserted the presumed value of the transmission line property of SP signal in frequency direction is carried out, thereby can obtain the transmission line property for all subcarriers.

Here, as shown in Figure 2, through will in time orientation carries out, inserting, thereby per 3 carrier waves are disperseed 1 transmission line presumed value in frequency direction to the SP signal transmission line presumed value of 1 SP signal of per 12 carrier wave decentralized configuration.Therefore, the time range that can infer out transmission line property expands to Ts/3 from Ts/12, even under the bigger environment of the difference of time of advent of incoming wave, as long as in the time range after expansion, also can correctly infer out transmission line property.

Fig. 4 is the figure of expression based on an example of the delay distribution of SP.Above-mentioned transmission line property value is carried out inverse Fourier transform, thereby the delay that obtains the intensity of reception signal that kind as shown in Figure 4, that represent each time of advent distributes (delay based on SP distributes).As shown in Figure 4, utilize in the digital broadcasting of ofdm signal, main ripple is to receive the highest incoming wave of level in a plurality of incoming waves that signal comprised.In addition because receive multipath that signal comprised, detouring etc. in redispatching, and produce the delay ripple and the advance wave (not shown among Fig. 4) of main ripple.Under the environment that is mounted with the moving body of receiving system (for example vehicle) high-speed mobile, the reception signal of receiving system receives Doppler's fluctuation, thereby the transmission line property of each code element fluctuates.

Fig. 5 is illustrated in the figure that infers the result that comprises the transmission line property of error in interior the inserting that time orientation carries out; Black circle mark among Fig. 5 is represented the presumed value of the transmission line property of SP signal; Big fork mark is illustrated in the presumed value that comprises the transmission line property of error in interior the inserting that time orientation carries out, and white circle mark is represented signals such as data.Promptly 1/ ((Ts+Tg)/8) are (Hz) if the peak frequency (also being called maximum doppler frequency) of the transmission line property fluctuation that causes because of Doppler fluctuation surpasses the peak frequency of interior reeve row interpolation of time orientation capable of using; Then as shown in Figure 5; Become the transmission line property that comprises error, can not correctly in time orientation carries out, insert.Here, Ts is an effective code element length, and Tg is the protection gap length, and is that the situation of inserting the SP signal in the cycle derives following formula from sampling thheorem and with 4 code elements, and following formula representes to inject in capable of using the peak frequency of row interpolation.

Fig. 6 is expression reaches the pseudo-incoming wave that wherein produces based on the delay distribution of SP figure.Because of being mounted with the moving body high-speed mobile of receiving system; As shown in Figure 5; Carry out the interior slotting of time orientation by error, if it is obtain delay distribution, then as shown in Figure 6 based on SP according to the result that infers of the transmission line property after inserting in carrying out by error; Can detect incoming wave ± time range of Ts/6 in, originally non-existent incoming wave as pseudo-incoming wave appear at postpone to distribute on.If receiving system misses control because of this puppet incoming wave, receptivity variation consequently then.

In addition, if in distributing, exist based on the delay of SP surpass incoming wave time of delay detection range promptly ± incoming wave of the time range of Ts/6, following problems then takes place.

Fig. 7 is the figure of expression based on an example of the caused problem of delay ripple that surpasses detection range in the delay distribution of SP.That kind as shown in Figure 7 surpasses ± incoming wave of the time range of Ts/6 if in distributing based on the delay of SP, exist time of delay, and then this incoming wave is rendered as the retrace signal that turns back as the signal in the detection range from time of delay originally on postponing to distribute.Therefore, be that the incoming wave that postpones ripple becomes the advance wave that kind with respect to main ripple originally, becoming is difficult to differentiate advance wave and postpones ripple.

On the other hand, in the delay based on power distributes, be Ts/2 though can detect the time range of incoming wave, it is poor with respect to the relative time of main ripple to obtain delay ripple and advance wave.Therefore, as shown in Figure 8, in the delay based on power distributes, can't differentiate advance wave and postpone ripple.In addition, when having a plurality of incoming wave, in the delay based on power distributes, owing to incoming wave interference to each other produces cross modulation, on non-existent incoming wave appears at and postpones to distribute originally.

Because patent documentation 1 utilizes the delay based on power to distribute, and therefore has the problems referred to above.In addition, use, will only appear at based on the incoming wave in the delay distribution of SP in statu quo as testing result though the device of patent documentation 2 will make up based on the delay distribution of SP with based on the delay distribution of power.Therefore, the pseudo-incoming wave that on the delay based on SP distributes, produces in the time of can't removing high-speed mobile.In addition, though the pseudo-incoming wave that the receiving system that patent documentation 3 is put down in writing produces during to high-speed mobile judge, thereby prevent mistake control, the detection range of incoming wave is limited in ± Ts/6, might miss control to long incoming wave time of delay.

Therefore; In the execution mode 1 of the present invention; Utilization distributes based on the delay of power, eliminates the error signal that the delay based on SP distributes and comprised, and the newly-generated delay based on SP of having eliminated this error signal distributes, be that so-called delays of having synthesized two kinds of advantages that postpone to distribute distribute.Through like this; Under high-speed mobile environment, or exist under the situation of the incoming wave that surpasses detection range time of delay, newly-generated delay does not have error in distributing yet; Postpone to distribute caused mistake control nor can have now, can carry out correct reception action.Below, its details is described.

Fig. 9 is the block diagram of structure of the digital broacast receiver of expression execution mode 1 of the present invention.The digital broacast receiver 1 of execution mode 1 is to use the OFDM mode to come the receiving system of receiving digital broadcast ripple; As shown in Figure 9, comprise inserting in Fourier transform portion 2, pilot signal extraction portion 3, known signal generation portion 4, division portion 5, the time orientation and insert portion 7, balanced portion 8, sub-carrier power calculating part 9, first 10a of inverse Fourier transform portion, second 10b of inverse Fourier transform portion in portion 6, the frequency direction and the synthetic portion 11 that postpones to distribute.

Fourier transform portion 2 be from the signal intercepting that receives go out during 1 code element time-domain signal (signal of transmission unit) thereby and implement the structural portion that Fourier transform generates frequency-region signal; Particularly, carry out fast Fourier transform (FFT:Fast Fourier Transform).Through implementing this Fourier transform, the carrier wave unit that the time-domain signal that receives is converted into frequency-region signal is each subcarrier signals.

Pilot signal extraction portion 3 is the structural portion that from each subcarrier signals of utilizing Fourier transform portion 2 to obtain, extract the SP signal that is inserted into the regulation sub-carrier positions.Known signal generation portion 4 generates with utilizing pilot signal extraction portion 3 to extract the structural portion of given value of the corresponding SP signal of regulation sub-carrier positions of SP signal.The value of the SP signal when the SP signal of given value is transmission is called known SP signal below.Division portion 5 is the structural portion that thereby the value of the SP signal that utilizes pilot signal extraction portion 3 to extract obtained the transmission line property value divided by the value of corresponding known SP signal with it.

In ofdm signal,, therefore,, insert in need carrying out and handle in order to obtain the transmission line property of all subcarriers because per 12 carrier waves are disperseed to insert the SP signal.At first, in ofdm signal,, therefore, in time orientation carries out, insert and handle owing to whenever dispose the SP signal at a distance from 4 code elements at time orientation.Inserting portion 6 in the time orientation is the structural portion of in the transmission line property value that time orientation generates division portion 5 is carried out, inserting, and (finite impulse response (FIR): Finite impulse response) filter etc. carries out the interior slotting processing of time orientation to utilize straight-line interpolation or multiple-symbol FIR.Through in time orientation carries out, insert handling, thereby that kind as shown in Figure 2 can obtain the transmission line property signal of per 3 carrier waves of frequency direction.

Insert portion 7 in the frequency direction and be the FIR filter that utilizes straight-line interpolation or multiple-symbol etc., insert the structural portion that transmission line property signal that portion 6 obtained carries out the interior slotting processing of frequency direction in the time orientation utilizing.Through implementing the interior slotting processing of this frequency direction, thereby that kind as shown in Figure 3 can obtain the transmission line property of all subcarriers.Thereby equilibrium portion 8 carries out balanced structural portion with each subcarrier signals of utilizing Fourier transform portion 2 to obtain divided by the transmission line property value of each subcarrier that utilizes the portion that inserts in the frequency direction 7 to obtain to received signal.In the back level of balanced portion 8, have signal reproduction portion, the equilibrium result of this signal reproduction portion from utilizing balanced portion 8 to obtain reveals original transmission data again.

Sub-carrier power calculating part 9 is from each subcarrier signals of utilizing Fourier transform portion 2 to obtain, calculates the structural portion of sub-carrier power.First 10a of inverse Fourier transform portion be according to sub-carrier power calculating part 9 operation result, generate the distribute structural portion of (first postpones to distribute) of delay based on power.Second 10b of inverse Fourier transform portion be utilize to the transmission line property signal that obtains in the time orientation interpolation portion 6 implement after the inverse Fourier transform the result, generate the distribute structural portion of (second postpones to distribute) of delay based on SP.

Postponing the synthetic portion 11 of distribution is based on the delay distribution of power, from the structural portion of second 10b of inverse Fourier transform portion input based on the delay distribution of SP from first 10a of inverse Fourier transform portion input; During reservation distributes based on the delay of power, with the corresponding value that distributes based on the delay of the SP time of advent with the value more than the threshold value; In addition the value that distributes based on the delay of SP is replaced to minimum value, thereby generating new the delay distributes.

Generally speaking, send from dispatching station the back till receiving system receives during, reflection and decay take place, and owing to send simultaneously from a plurality of dispatching stations, promptly become multipath signal thereby there are a plurality of incoming waves to arrive receiving systems.The data of the time of advent of expression each incoming wave that multipath signal comprised and intensity (D/U ratio) are known as and postpone to distribute.In postpone distributing, the incoming wave that intensity is the strongest is known as main ripple, than main ripple late to incoming wave be known as the delay ripple, than main ripple early to incoming wave be known as advance wave.

Next, action is described.

At first; Sub-carrier power calculating part 9 is asked a square also addition respectively with the I axle (real axis) and the Q axle (axis of imaginaries) of the frequency-region signal (complex signal) of each subcarrier that obtains in the Fourier transform portion 2; And the I axle input of the inverse Fourier transform that this addition result is carried out as first 10a of inverse Fourier transform portion, to Q axle input zero.

First 10a of inverse Fourier transform portion carries out inverse Fourier transform, and I axle after the inverse Fourier transform and Q axle are asked a square also addition respectively, this addition result is outputed to the delay distribution as the delay distribution (first postpones to distribute) based on power synthesize portion 11.

Be characterized as based on what the delay of power distributed: main ripple is at the center, and the time range that can detect incoming wave is for from 0 to Ts/2, and postponing ripple and advance wave is that the center demonstrates left-right symmetric with main ripple all.In addition, also can carry out using after the smoothing processing to the delay distribution that obtains here based on power.

Second 10b of inverse Fourier transform portion carries out inverse Fourier transform to the output (complex signal) of time orientation interpolation portion 6; The I axle of the output of inverse Fourier transform and Q axle are asked respectively square and an addition, with this addition result as the delay based on SP distribute (second postpones to distribute) output to postpone to distribute and synthesize portion 11.In addition, be known as the demodulation datum mark based on center in the delay distribution of SP, that can detect the time range of incoming wave.That is, in distributing based on the delay of SP, with the demodulation datum mark be the center ± can detect incoming wave in the scope of Ts/6.In addition, also can carry out using after the smoothing processing to the delay distribution that obtains here based on SP.

In addition, be known as index in proper order based on the delay distribution of power with based on each data in these two kinds delay distributions of delay distribution of SP, each index is equivalent to the time of advent.

Figure 10 is the distribute flow chart of flow process of the action that synthetic portion carried out of the delay of expression execution mode 1, and Figure 11 is the key diagram of the explanation synthetic processing that postpones to distribute.With reference to Figure 11, the generation processing that new delay distributes is described along Figure 10.

The synthetic portion 11 of delay distribution detects the index (step ST1) based on the main ripple of the delay distribution of SP.Because main ripple has maximum in postpone distributing, therefore, detect in each data that the delay based on SP distributes, with the index of the corresponding index of maximum as main ripple.

Then, the synthetic portion 11 that postpone to distribute calculates main ripple deviant (step ST2), and this main ripple deviant is equivalent to the index of the main ripple that the delay based on SP distributes, poor with based on the index of the delay center of distribution (demodulation datum mark) of SP.In Figure 11 (a), the delay center of distribution based on SP that dots (demodulation datum mark) is that α is main ripple deviant with the difference of the index of main ripple.Therefore, the index of the main ripple that the synthetic portion 11 that postpone to distribute distributes from the delay based on SP deducts the index of the delay center of distribution (demodulation datum mark) based on SP, obtains value after deducting as main ripple deviant α.In addition, shown in Figure 11 (b), in the delay based on power distributed, main ripple must become the delay center of distribution.

Then, postpone the synthetic portion 11 of distribution and make index offset (step ST3) based on the delay distribution of power.Here, the size of main ripple deviant α that made the index offset that distributes based on the delay of power, thus change each data.Thus, shown in Figure 11 (c), make the index of the main ripple that the index of the main ripple that distributes based on the delay of SP and delay based on power distribute consistent.

The synthetic portion 11 that postpone to distribute reads out in the value (step ST4) that the delay based on power behind the index offset is distributed by each index; And compare with defined threshold (critical value), whether the value of reading is judged (step ST5) less than threshold value.Here, at readout be (step ST5: not),, and transfer to the processing of step ST7 under the situation more than the threshold value not to carrying out any processing based on the data that the delay of SP distributes accordingly with time of advent (index) of this readout.

On the other hand; Synthetic portion 11 will replace to 0 (perhaps replacing to the minimum value of not handling as incoming wave) (step ST6) with the corresponding data that distribute based on the delay of the SP time of advent (index) of this readout if readout less than threshold value (step ST5: be), then postpones to distribute.

In addition, according to counting of inverse Fourier transform, the delay based on SP sometimes distributes with not unique corresponding based on the time of delay between the delay distribution of power.In this case, select the value of immediate time of delay (index) and replace to 0 or above-mentioned minimum value.In addition, if do not exist and corresponding value time of delay in the delay distribution based on SP, then do not handle.This is because scope time of delay (scope detection time) that distributes based on the delay of power is Ts/2, and different therewith is, scope time of delay that distributes based on the delay of SP is ± Ts/6.

Each when carrying out above-mentioned processing, 11 pairs of all index that distribute based on the delay of power of synthetic portion that postpone to distribute are judged and whether are finished (step ST7).Here; Processing as if all index that the delay based on power is distributed does not finish (step ST7: not); Then get back to the processing of step ST4, read and the corresponding value of next index that distributes based on the delay of power, repeat processing from step ST4 to step ST7.

To all index that distribute based on the delay of power be through with (step ST7: be) under the situation of above-mentioned processing; Postpone to distribute synthetic portion 11 in will distributing based on the delay of power, replace to 0 or minimum value with the corresponding value of value that does not reach threshold value, and will replace delay that the back forms and distribute and promptly syntheticly postpone distribution and export as what synthesized two kinds of advantages that postpone to distribute based on SP.

Promptly; Even in the original delay based on SP distributes, comprise under the situation of pseudo-incoming wave; The advantage of also utilizing delay that pseudo-incoming wave do not occur to distribute based on power; Remove pseudo-incoming wave based on the delay distribution of SP; Distribute thereby can obtain the delay shown in Figure 11 (d) as synthetic delay distribution, pseudo-incoming wave no longer occurs.

In addition; Though in the delay based on power distributes, can't differentiate advance wave and postpone ripple; Distribute with the delay that postpones ripple but can differentiate advance wave, thereby in synthetic delay distributes, can suchly shown in Figure 11 (d) differentiate advance wave and postpone ripple based on SP through utilization.

And, exist under the situation of a plurality of incoming waves, in delay distribution, form cross modulation based on power, have in the shortcoming that postpones can occur in the distribution the non-existent incoming wave of script, but synthetic delay then can not occur in distributing.Thus, compared with prior art, execution mode 1 can correctly be obtained and postpone to distribute.

As stated,, comprising according to this execution mode 1: Fourier transform portion 2,2 pairs of ofdm signals that receive of this Fourier transform portion carry out Fourier transform by each transmission unit; Sub-carrier power calculating part 9, this sub-carrier power calculating part 9 calculates the sub-carrier power data according to the data of utilizing after Fourier transform portion 2 carries out Fourier transform; First 10a of inverse Fourier transform portion, this first inverse Fourier transform 10a of portion carries out inverse Fourier transform to the sub-carrier power data, thus the delay that generates based on power distributes; Pilot signal extraction portion 3, this pilot signal extraction portion 3 goes out pilot signal from the extracting data of utilizing Fourier transform portion 2 to carry out after the Fourier transform; Division portion 5, this division portion 5 with pilot signal divided by given value, thereby calculate transmission line property data for the pilot signal of each transmission unit; Insert portion 6 in the time orientation, inserting portion 6 in this time orientation will be slotting time orientation carries out in for the transmission line property data of the pilot signal of each transmission unit; Second 10b of inverse Fourier transform portion, this second inverse Fourier transform 10b of portion carries out inverse Fourier transform to the transmission line property data of in time orientation, inserting, thus the delay that generates based on SP distributes; And the synthetic portion 11 that postpones to distribute; Squint the detection time of the incoming wave that this synthetic portion 11 of delay distribution will distribute based on the delay of power; So that the time of advent of the main ripple that distributes and distribute based on the delay of SP based on the delay of power is consistent; And the corresponding value time of advent that keeps the value more than the defined threshold of delay based on the SP delay based on power in distributing, that squinted detection time with incoming wave in distributing; To replace to the value do not handled (0 or do not handle minimum value) with the corresponding value time of advent, thereby distribute and export as the delay of the ofdm signal that receives less than the value of threshold value as incoming wave as incoming wave.

Like this; The pseudo-incoming wave that distributes through the delay that utilizes delay based on power to distribute to delete based on SP; Delay based on power distributes and distribute based on distribute these the two kinds delays of the advantage that postpones to distribute of the delay of SP thereby can obtain to have synthesized; Even under high-speed mobile environment, also can obtain to have the delay distribution of the correct time of advent and correct power.

Execution mode 2

The digital broacast receiver of this execution mode 2 structure with above-mentioned execution mode 1 basically is identical, but the synthetic generation method difference that postpones distribution.

Therefore, for the structure of the digital broacast receiver of execution mode 2, with reference to the Fig. 9 shown in the above-mentioned execution mode 1, the generation that hereinafter the synthetic delay of above-mentioned execution mode 2 is distributed is handled and is elaborated.

Figure 12 is the distribute flow chart of flow process of the action that synthetic portion carried out of the delay of expression execution mode 2 of the present invention, schemes to explain that along this generation that new delay distributes handles.

The synthetic portion 11 of delay distribution detects the index (step ST1a) based on the main ripple of the delay distribution of SP.Because main ripple has maximum in postpone distributing, therefore, detect in each data that the delay based on SP distributes, with the index of the corresponding index of maximum as main ripple.

Then, the synthetic portion 11 that postpone to distribute calculates main ripple deviant (step ST2a), and this main ripple deviant is equivalent to the index of the main ripple that the delay based on SP distributes, poor with based on the index of the delay center of distribution (demodulation datum mark) of SP., deduct the index of delay center of distribution (demodulation datum mark) here, obtain value after deducting as main ripple deviant α based on SP from the index of the main ripple that distributes based on the delay of SP.

Then, postpone the synthetic portion 11 of distribution and make index offset (step ST3a) based on the delay distribution of power.Here, the size of main ripple deviant α that made the index offset that distributes based on the delay of power, thereby change each data, delay based on SP is distributed and the index of the main ripple that distributes based on the delay of power consistent.

The synthetic portion 11 that postpone to distribute reads out in the value (step ST4a) that the delay based on power behind the index offset is distributed by each index, with this readout and with the value that distributes based on the delay of SP accordingly time of advent (index) of this readout multiply each other (step ST5a).

In addition, according to counting of inverse Fourier transform, the delay based on SP sometimes distributes with not unique corresponding based on the time of delay between the delay distribution of power.In this case, select the value of immediate time of delay (index) and multiplying each other.

In addition, if do not exist and corresponding value time of delay in the delay distribution based on SP, then do not handle.This is because scope time of delay (scope detection time) that distributes based on the delay of power is Ts/2, and different therewith is, scope time of delay that distributes based on the delay of SP is ± Ts/6.

Each when carrying out above-mentioned processing, 11 pairs of all index that distribute based on the delay of power of synthetic portion that postpone to distribute are judged and whether are finished (step ST6a).Here; Processing as if all index that the delay based on power is distributed does not finish (step ST6a: not); Then get back to the processing of step ST4a, read and the corresponding value of next index that distributes based on the delay of power, repeat processing from step ST4a to step ST6a.

To all index that distribute based on the delay of power be through with (step ST6a: be) under the situation of above-mentioned processing; Postpone to distribute synthetic portion 11 between delay distribution and delay distribution based on SP based on power; The value of corresponding index is multiplied each other each other, and the result after will multiplying each other distributes as the delay of the ofdm signal that receives and exports.

Postpone to distribute through such generation, thereby, also, therefore, can reduce the level of pseudo-incoming wave through multiplication owing to pseudo-incoming wave do not occur in the delay distribution based on power even in the delay based on SP distributes, comprise under the situation of pseudo-incoming wave.

In addition, though in distributing, can't differentiate advance wave and postpone ripple, synthesize through distributing, thereby also can differentiate advance wave and postpone ripple with delay based on SP based on the delay of power.

And; Exist under the situation of a plurality of incoming waves, in delay distribution, form cross modulation, have in the shortcoming that postpones to occur in the distribution the non-existent incoming wave of script based on power; But owing to be the incoming wave that is not present in based in the delay distribution of SP; Therefore, if utilize multiplication to synthesize, then can reduce the level of this incoming wave.

Thus, compared with prior art, execution mode 2 can correctly be obtained and postpone to distribute.In addition,, also needn't adjust this threshold value, therefore, compare with above-mentioned execution mode 1 because the value and the defined threshold that needn't distribute to the delay based on power compare, can the simplification device structure.

As stated,, comprising according to this execution mode 2: Fourier transform portion 2,2 pairs of ofdm signals that receive of this Fourier transform portion carry out Fourier transform by each transmission unit; Sub-carrier power calculating part 9, this sub-carrier power calculating part 9 calculates the sub-carrier power data according to the data of utilizing after Fourier transform portion 2 carries out Fourier transform; First 10a of inverse Fourier transform portion, this first inverse Fourier transform 10a of portion carries out inverse Fourier transform to the sub-carrier power data, thus the delay that generates based on power distributes; Pilot signal extraction portion 3, this pilot signal extraction portion 3 goes out pilot signal from the extracting data of utilizing Fourier transform portion 2 to carry out after the Fourier transform; Division portion 5, this division portion 5 with the pilot signal that extracts divided by given value, thereby calculate transmission line property data for the pilot signal of each transmission unit; Insert portion 6 in the time orientation, inserting portion 6 in this time orientation will be slotting time orientation carries out in for the transmission line property data of the pilot signal of each transmission unit; Second 10b of inverse Fourier transform portion, this second inverse Fourier transform 10b of portion carries out inverse Fourier transform to the transmission line property data of in time orientation, inserting, thus the delay that generates based on SP distributes; And the synthetic portion 11 that postpones to distribute; Squint the detection time of the incoming wave that this synthetic portion 11 of delay distribution will distribute based on the delay of power; So that the time of advent of the main ripple that distributes and distribute based on the delay of SP based on the delay of power is consistent; And the value of the corresponding time of advent that distributes and distribute based on the delay of SP based on the delay of power of being squinted the detection time of incoming wave is multiplied each other, thereby distribute and export as the delay of the ofdm signal that receives.

Like this; Distribute through the synthetic value that distributes based on the delay of power with based on the delay of SP; Thereby make based on the distribute error signal that comprised and offset of the delay of power based on the delay of the SP error signal that is comprised that distributes; Even under high-speed mobile environment, also can detect delay and distribute with correct time of advent.In addition,, compare with above-mentioned execution mode 1 owing to need not have threshold value, can the simplification device structure.

Execution mode 3

The digital broacast receiver of this execution mode 3 structure with above-mentioned execution mode 1 basically is identical, but the synthetic generation method difference that postpones distribution.

Therefore, for the structure of the digital broacast receiver of execution mode 3, with reference to the Fig. 9 shown in the above-mentioned execution mode 1, the generation that hereinafter the synthetic delay of above-mentioned execution mode 3 is distributed is handled and is elaborated.

Figure 13 is the key diagram of the synthetic processing of the delay distribution in the explanation execution mode 3 of the present invention.As utilizing in the above-mentioned execution mode 1 Fig. 7 describes; In the delay based on SP distributes; Surpass ± Ts/6 at a distance of the demodulation datum mark time of advent as if incoming wave, and then advance wave turns back becomes the delay ripple, and the delay setback are returned to become advance wave and appear at and postponed in the distribution.Figure 13 (a) expression than turn back at a distance of the more Zao advance wave of time range of-Ts/6 with the demodulation datum mark, and picture postpone Poona's appearance and appear at the situation that postpones in the distribution.

On the other hand, in distributing based on the delay of power, shown in Figure 13 (c), the time range that can detect incoming wave is for till Ts/2, but can only obtain postpone ripple and advance wave poor with respect to the relative time of main ripple.Therefore, distribute based on the delay of power with center (main ripple) at a distance of differentiating advance wave and postpone ripple in the detected incoming wave in the time range of ± Ts/2.

Therefore; The delay of execution mode 3 distributes and synthesizes portion 11 that kind shown in Figure 13 (b); In will distributing based on the delay of SP, with the demodulation datum mark be the center ± Ts/6 detection time scope the delay distribution of content copy to respectively that the original delay based on SP distributes detection time scope front and back, postpone to distribute (the 3rd postpones to distribute) thereby generate.

Because it is consistent at a distance of the time range of ± Ts/2 with the center that this postpone to distribute and to distribute with delay based on power, therefore, can utilize the method identical, the delay distribution of the ofdm signal that generation receives with above-mentioned execution mode 1 or above-mentioned execution mode 2.

Promptly; As above-mentioned execution mode 1; Carry out migration processing (index of the main ripple that the index of its main ripple and delay based on SP distribute is complementary) to distributing with the delay based on power of center in the time range of ± Ts/2; Read by each index and to carry out value that the delay based on power after the migration processing distributes and compare with defined threshold (critical value); Will with replace to 0 or minimum value less than the corresponding above-mentioned value that distributes based on the delay of SP of the index of the readout of this threshold value, and the delay after will replace distributes as the delay distribution of the ofdm signal that receives.

In addition; As above-mentioned execution mode 2; Carry out migration processing (index of the main ripple that the index of its main ripple and delay based on SP distribute is complementary) to distributing with the delay based on power of center in the time range of ± Ts/2; Read by each index and to carry out the value that the delay based on power after the migration processing distributes; With this readout and with time of advent (index) of this readout the corresponding above-mentioned value that distributes based on the delay of SP multiply each other, the delay that the delay after will multiplying each other distributes as the ofdm signal that receives distributes.

Distributing with delay based on power through scope detection time that will distribute based on the delay of SP is complementary and synthetic, thus can correctly detect the delay that appears at owing to turning back based on SP on distributing, above the incoming wave of ± Ts/6.In addition, can detectable maximum delay time be expanded in addition ± advantage of Ts/2.

As stated; According to this execution mode 3; Postpone to distribute synthetic portion 11 use incoming wave will distributing from the delay based on SP of second 10b of inverse Fourier transform portion output detection time scope the delay that copies to the front and back of this of scope respectively of delay distribution of content detection time distribute and distribute with the delay based on power of center at a distance of the time range of ± Ts/2, thereby the delay that generates the ofdm signal that receives distributes.

Through like this, can obtain the effect identical, and incoming wave range expansion detection time in distributing based on the delay of SP become 3 times with above-mentioned execution mode 1 or above-mentioned execution mode 2.

Execution mode 4

Figure 14 is the block diagram of structure of the digital broacast receiver of expression execution mode 4 of the present invention.From execution mode 1 to execution mode 3 the structure; Comprise first 10a of inverse Fourier transform portion and these 2 inverse Fourier transform portions of second 10b of inverse Fourier transform portion; But shown in figure 14, the digital broacast receiver 1B of execution mode 4 only comprises 1 inverse Fourier transform portion 10.Promptly; Signal selecting part 12 switches the output of the output of sub-carrier power calculating part 9 and time orientation interpolation portion 6 and is input to inverse Fourier transform portion 10, and delay based on power distributes and the delay that generates based on SP distributes thereby 1 inverse Fourier transform portion 10 generates.In addition, storage part 13 is storage parts of depositing the delay distribution that is generated by inverse Fourier transform portion 10, and stored delay distributes and suitably reads by postponing the synthetic portion 11 of distribution.In addition, among Figure 14,, and omit its explanation to the structural portion mark same numeral identical with Fig. 9.

Next, action is described.

Signal selecting part 12 is selected respectively for inserting the output of portion 6 in the output same signal that receives, sub-carrier power calculating part 9 and the time orientation and being input to inverse Fourier transform portion 10.

In inverse Fourier transform portion 10; Output signal to inserting portion 6 in the output signal of the sub-carrier power calculating part 9 imported via signal selecting part 12 and the time orientation carries out inverse Fourier transform respectively; The I axle and the Q axle of these transformation results are asked a square also addition respectively, thereby as depositing in the storage part 13 based on the delay distribution of power with based on the delay distribution of SP.

In addition, at this moment, inverse Fourier transform portion 10 is also can be shown in enforcement mode 3 such, distributes for the delay based on SP, this is distributed based on the delay of SP detection time scope content replication generate before and after the time series and distribute and be stored in the storage part 13.

The synthetic portion 11 that postpone to distribute utilizes the delay of depositing in the storage part 13 based on power to distribute and distributes based on the delay of SP, with the arbitrary execution mode identical method of execution mode 1 to execution mode 3, the delay that generates the ofdm signal that receives distributes.

As stated,, comprising according to this execution mode 4: Fourier transform portion 2,2 pairs of ofdm signals that receive of this Fourier transform portion carry out Fourier transform by each transmission unit; Sub-carrier power calculating part 9, this sub-carrier power calculating part 9 calculates the sub-carrier power data according to the data of utilizing after Fourier transform portion 2 carries out Fourier transform; Pilot signal extraction portion 3, this pilot signal extraction portion 3 goes out pilot signal from the extracting data of utilizing Fourier transform portion 2 to carry out after the Fourier transform; Division portion 5, this division portion 5 with the pilot signal that extracts divided by given value, thereby calculate transmission line property data for the pilot signal of each transmission unit; Insert portion 6 in the time orientation, insert portion 6 in this time orientation and will time orientation carries out in, insert and export for the transmission line property data of the pilot signal of each transmission unit; Signal selecting part 12, this signal selecting part 12 switches the dateout of inserting portion 6 in sub-carrier power calculating part 9 and the time orientation and selects; The dateout that inverse Fourier transform portion 10,10 pairs in this inverse Fourier transform portion utilize signal selecting part 12 to select is carried out inverse Fourier transform; And storage part 13; This storage part 13 stores that the delay based on power that the dateout of utilizing 10 pairs of sub-carrier power calculating parts 9 of inverse Fourier transform portion carries out obtaining after the inverse Fourier transform distributes and the delay based on SP that the dateout of inserting portion 6 in the time orientation is carried out obtaining after the inverse Fourier transform distributes; The synthetic portion 11 that postpone to distribute utilizes the delay based on power of reading from storage part 13 to distribute and distributes based on the delay of SP, distributes and exports as the delay of the ofdm signal that receives.Through this structure, can make inverse Fourier transform portion become 1 from 2, thereby reduce circuit.

Execution mode 5

Figure 15 is the block diagram of structure of the digital broacast receiver of expression execution mode 5 of the present invention.The digital broacast receiver 1C of execution mode 5 has appended regularly generation portion 14 of Fourier transform to the structure of above-mentioned execution mode 4.Fourier transformation regularly generating unit 14 is based on the structural portion that the output of portion 11 (synthesize and postpone distribution), the optimum Fourier transformation timing of generation (the time started position of Fourier transformation) are synthesized in the delay distribution.Regularly the Fourier transform that generated to Fourier transform portion 2 notice of generation portion 14 is regularly from Fourier transform.For example, surpass protection incoming wave at interval and appear at and postpone when lasting that distributes when the time of advent, Fourier transform regularly 14 pairs of Fourier transforms of generation portion regularly change so that the time of advent in the protection interval.Thus, can improve receptivity.In addition, postpone 11 utilizations of the synthetic portion of distribution and generate the synthetic distribution that postpones to the identical method of arbitrary execution mode of above-mentioned execution mode 3 with above-mentioned execution mode 1.

In addition, in execution mode 5, the output of synthesizing portion 11 (synthetic delay distributes) based on postponing to distribute, slotting portion 6 determines the optimum interpolation coefficient respectively with the interior portion 7 that inserts of frequency direction in the time orientation.For example, postpone the last time that distributes, coefficient is changed so that it falls in this interpolation coefficient band when the incoming wave that surpasses the interpolation coefficient band appears at.

In addition; Below the digital broacast receiver of execution mode 5 is carried out in the control at least one: above-mentioned Fourier transform is regularly inserted in the generation portion 14 Fourier transform timing controlled of carrying out, the time orientation in interpolation coefficient control that portion 6 carries out and the frequency direction and is inserted the interpolation coefficient control that portion 7 carries out, and also can all control be made up and carry out.

As stated; According to this execution mode 5; Owing to comprise the beginning Fourier transform generation portion 14 regularly of (time started position) regularly that distributes and decide Fourier transform according to the synthetic delay that generates by the synthetic portion 11 that postpone to distribute; Therefore, the correct delay that does not contain error signal that can utilize the synthetic portion 11 of delay distribution to generate distributes, and decides the beginning timing of correct Fourier transform.

In addition; Because at least one basis of inserting in interior slotting portion 6 of time orientation and the frequency direction in the portion 7 decides interpolation coefficient by synthetic delay distribution that the synthetic portion 11 of delay distribution generates; Therefore; Can utilize the correct delay that does not contain error signal that generates by the synthetic portion 11 of delay distribution to distribute, decide the optimum interpolation coefficient.

The synthetic result of delay distribution who does not contain error through such utilization controls, thereby even when running at high speed, postpone also can not miss control under the environment than long incoming wave with existence, can improve the receptivity of receiving system.

In addition; Although in execution mode 5; Show the structure of execution mode 4 has been appended the regularly situation of generation portion 14 of Fourier transform; But also can adopt the notion of execution mode 5 to arbitrary execution mode of execution mode 3 to execution mode 1; Thereby constitute and carry out Fourier transform and regularly insert at least a control of inserting in interpolation coefficient control that portion 6 carries out and the frequency direction in the interpolation coefficient control that portion 7 carries out in the generation portion 14 Fourier transform timing controlled of carrying out, the time orientation, perhaps can constitute all control made up and carry out.

Practicality in the industry

Digital broacast receiver involved in the present invention; Even because under the environment of the moving body high-speed mobile that is mounted with this receiving system; Or, the delay based on SP exists under the situation of the incoming wave that surpasses the time range that can detect incoming wave in distributing; Also can provide the delay that does not contain error to distribute, and can correctly receive and miss control, so be applicable to that vehicle uses digital broacast receiver.

Claims

1. digital broacast receiver, this digital broacast receiver receives the signal behind OFDM, it is characterized in that, comprising:

Fourier transform portion, this Fourier transform portion carries out Fourier transform to the orthogonal frequency-division multiplex singal that receives by each transmission unit;

The sub-carrier power calculating part, this sub-carrier power calculating part calculates the sub-carrier power data according to the data of utilizing after said Fourier transform portion carries out Fourier transform;

The first inverse Fourier transform portion, this first inverse Fourier transform portion carries out inverse Fourier transform to the sub-carrier power data of utilizing said sub-carrier power calculating part to calculate, postpones to distribute thereby generate first;

The pilot signal extraction unit, this pilot signal extraction unit goes out pilot signal from the extracting data of utilizing said Fourier transformation portion to carry out after the Fourier transformation;

Division portion, this division portion will utilize pilot signal that said pilot signal extraction portion extracts divided by given value, thereby calculate the transmission line property data for the pilot signal of each transmission unit;

The transmission line property data for the pilot signal of each transmission unit that time orientation interpolation portion, this time orientation interpolation portion will utilize that said division portion calculates are carried out interpolation at time orientation;

The second inverse Fourier transform portion, this second inverse Fourier transform portion carries out inverse Fourier transform to utilize the transmission line property data after the portion that inserts in the said time orientation inserts in time orientation carries out, and postpones to distribute thereby generate second; And

Synthetic portion postpones to distribute; This synthetic portion of delay distribution squints the detection time of the incoming wave that said first delay distributes; So that by the said first inverse Fourier transform portion generate first postpone to distribute and the time of advent of the second main ripple that postpones to distribute that generates by the said second inverse Fourier transform portion consistent; And keep said second in postpone distributing, with the corresponding value time of advent of value more than first the defined threshold in postponing to distribute that is squinted the detection time of said incoming wave; To replace to the value of not handling with the corresponding value time of advent, thereby distribute and export as the delay of the said orthogonal frequency-division multiplex singal that receives less than the value of said threshold value as incoming wave.

2. digital broacast receiver as claimed in claim 1; It is characterized in that; The synthetic portion of said delay distribution uses the 3rd delay to distribute alternative second delay that is generated by the said second inverse Fourier transform portion to distribute; Wherein the 3rd postpone to distribute be with this second in postponing to distribute incoming wave detection time scope content copy to respectively that the front and back of this of scope form detection time; The synthetic portion of said delay distribution squints the detection time of the incoming wave that said first delay distributes; So that the said the 3rd postpone to distribute and the time of advent of the first main ripple that postpones to distribute that generates by the said first inverse Fourier transform portion consistent; And keep the said the 3rd in postpone distributing, with the corresponding value time of advent of value more than first the defined threshold in postponing to distribute that is squinted the detection time of said incoming wave; To replace to the value of not handling with the corresponding value time of advent, thereby distribute and export as the delay of the said orthogonal frequency-division multiplex singal that receives less than the value of said threshold value as incoming wave.

3. digital broacast receiver as claimed in claim 1; It is characterized in that; Comprise regularly generation portion of Fourier transform; This Fourier transform is the content that distributes of the delay that generates based on the synthetic portion that distributed by said delay of generation portion regularly, and the beginning of the Fourier transform that decision is undertaken by said Fourier transform portion regularly.

4. digital broacast receiver as claimed in claim 1; It is characterized in that; The content that the delay that the portion that inserts in the said time orientation generates based on the synthetic portion that distributed by said delay distributes determines the interpolation coefficient of inserting in the time orientation of said transmission line property data.

5. digital broacast receiver as claimed in claim 1; It is characterized in that; Comprise the portion that inserts in the frequency direction, the portion that inserts in this frequency direction inserts in frequency direction is carried out the transmission line property data of utilizing the portion that inserts in the said time orientation in time orientation has carried out, to insert

The content that the delay that said frequency direction interpolation portion generates based on the synthetic portion that distributed by said delay distributes determines the interpolation coefficient of said transmission line property data frequency directional interpolation.

6. digital broacast receiver, this digital broacast receiver receives the signal behind OFDM, it is characterized in that, comprising:

Synthetic portion postpones to distribute; This synthetic portion of delay distribution squints the detection time of the incoming wave that said first delay distributes; So that by the said first inverse Fourier transform portion generate first postpone to distribute and the time of advent of the second main ripple that postpones to distribute that generates by the said second inverse Fourier transform portion consistent; And first value that postpone to distribute with said second corresponding time of advent of postponing to distribute that is squinted the detection time of said incoming wave is multiplied each other, thereby as the delay distribution of the said orthogonal frequency-division multiplex singal that receives and export.

7. digital broacast receiver as claimed in claim 6; It is characterized in that; The synthetic portion of said delay distribution uses the 3rd delay to distribute alternative second delay that is generated by the said second inverse Fourier transform portion to distribute; Wherein the 3rd postpone to distribute be with this second in postponing to distribute incoming wave detection time scope content copy to respectively that the front and back of this of scope form detection time; The synthetic portion of said delay distribution squints the detection time of the incoming wave that said first delay distributes; So that the said the 3rd postpone to distribute and the time of advent of the first main ripple that postpones to distribute that generates by the said first inverse Fourier transform portion consistent; And first value that postpone to distribute with the said the 3rd corresponding time of advent of postponing to distribute that is squinted the detection time of said incoming wave is multiplied each other, thereby as the delay distribution of the said orthogonal frequency-division multiplex singal that receives and export.

8. digital broacast receiver as claimed in claim 6; It is characterized in that; Comprise regularly generation portion of Fourier transform; This Fourier transform is the content that distributes of the delay that generates based on the synthetic portion that distributed by said delay of generation portion regularly, and the beginning of the Fourier transform that decision is undertaken by said Fourier transform portion regularly.

9. digital broacast receiver as claimed in claim 6; It is characterized in that; The content that the delay that the portion that inserts in the said time orientation generates based on the synthetic portion that distributed by said delay distributes determines the interpolation coefficient of inserting in the time orientation of said transmission line property data.

10. digital broacast receiver as claimed in claim 6; It is characterized in that; Comprise the portion that inserts in the frequency direction, the portion that inserts in this frequency direction inserts in frequency direction is carried out the transmission line property data of utilizing the portion that inserts in the said time orientation in time orientation has carried out, to insert

11. a digital broacast receiver, this digital broacast receiver receives the signal behind the OFDM, it is characterized in that, comprising:

Sub-carrier power calculating part, this sub-carrier power calculating part calculate sub-carrier power data and output according to the data of utilizing after said Fourier transform portion carries out Fourier transform;

The transmission line property data for the pilot signal of each transmission unit that time orientation interpolation portion, this time orientation interpolation portion will utilize that said division portion calculates are carried out interpolation and output at time orientation;

Signal selecting part, this signal selecting part switches the dateout of inserting portion in said sub-carrier power calculating part and the said time orientation and selects;

Inverse Fourier transform portion, this inverse Fourier transform portion carries out inverse Fourier transform to the dateout of utilizing said signal selecting part to select;

Storage part, this storage portion stores have and utilize said inverse Fourier transform portion first to postpone to distribute and second postpone to distribute to what the dateout of inserting portion in the said time orientation carried out obtaining after the inverse Fourier transform what the dateout of said sub-carrier power calculating part carried out obtaining after the inverse Fourier transform; And

Synthetic portion postpones to distribute; This synthetic portion of delay distribution squints the detection time of the incoming wave that said first delay distributes; So that said first postpone to distribute with said second to postpone time of advent of main ripple of distribution consistent from what said storage part was read; And keep said second in postpone distributing, with the corresponding value time of advent of value more than said first the defined threshold in postponing to distribute that is squinted the detection time of said incoming wave; To replace to the value of not handling with the corresponding value time of advent, thereby distribute and export as the delay of the said orthogonal frequency-division multiplex singal that receives less than the value of said threshold value as incoming wave.

12. digital broacast receiver as claimed in claim 11; It is characterized in that; The synthetic portion of said delay distribution uses the 3rd delay to distribute alternative second delay that is generated by the said second inverse Fourier transform portion to distribute; Wherein the 3rd postpone to distribute be with this second in postponing to distribute incoming wave detection time scope content copy to respectively that the front and back of this of scope form detection time; The synthetic portion of said delay distribution squints the detection time of the incoming wave that said first delay distributes; So that said the 3rd delay distributes and the time of advent of the main ripple that said first delay distributes is consistent; And keep the said the 3rd in postpone distributing, with the corresponding value time of advent of value more than first the defined threshold in postponing to distribute that is squinted the detection time of said incoming wave, will replace to the value of not handling with the corresponding value time of advent, thereby distribute and export as the delay of the said orthogonal frequency-division multiplex singal that receives less than the value of said threshold value as incoming wave.

13. digital broacast receiver as claimed in claim 11; It is characterized in that; Comprise regularly generation portion of Fourier transform; This Fourier transform is the content that distributes of the delay that generates based on the synthetic portion that distributed by said delay of generation portion regularly, and the beginning of the Fourier transform that decision is undertaken by said Fourier transform portion regularly.

14. digital broacast receiver as claimed in claim 11; It is characterized in that; The content that the delay that the portion that inserts in the said time orientation generates based on the synthetic portion that distributed by said delay distributes determines the interpolation coefficient of inserting in the time orientation of said transmission line property data.

15. digital broacast receiver as claimed in claim 11; It is characterized in that; Comprise the portion that inserts in the frequency direction, the portion that inserts in this frequency direction inserts in frequency direction is carried out the transmission line property data of utilizing the portion that inserts in the said time orientation in time orientation has carried out, to insert

16. a digital broacast receiver, this digital broacast receiver receives the signal behind the OFDM, it is characterized in that, comprising:

Synthetic portion postpones to distribute; This synthetic portion of delay distribution squints the detection time of the incoming wave that said first delay distributes; So that said first postpone to distribute with said second to postpone time of advent of main ripple of distribution consistent from what said storage part was read; And first value that postpone to distribute with said second corresponding time of advent of postponing to distribute that is squinted the detection time of said incoming wave is multiplied each other, thereby as the delay distribution of the said orthogonal frequency-division multiplex singal that receives and export.

17. digital broacast receiver as claimed in claim 16; It is characterized in that; The synthetic portion of said delay distribution uses the 3rd delay to distribute alternative second delay that is generated by the said second inverse Fourier transform portion to distribute; Wherein the 3rd postpone to distribute be with this second in postponing to distribute incoming wave detection time scope content copy to respectively that the front and back of this of scope form detection time; The synthetic portion of said delay distribution squints the detection time of the incoming wave that said first delay distributes; So that said the 3rd delay distributes and the time of advent of the main ripple that said first delay distributes is consistent; And first value that postpone to distribute with the said the 3rd corresponding time of advent of postponing to distribute that is squinted the detection time of said incoming wave is multiplied each other, thereby as the delay distribution of the said orthogonal frequency-division multiplex singal that receives and export.

18. digital broacast receiver as claimed in claim 16; It is characterized in that; Comprise regularly generation portion of Fourier transform; This Fourier transform is the content that distributes of the delay that generates based on the synthetic portion that distributed by said delay of generation portion regularly, and the beginning of the Fourier transform that decision is undertaken by said Fourier transform portion regularly.

19. digital broacast receiver as claimed in claim 16; It is characterized in that; The content that the delay that the portion that inserts in the said time orientation generates based on the synthetic portion that distributed by said delay distributes determines the interpolation coefficient of inserting in the time orientation of said transmission line property data.

20. digital broacast receiver as claimed in claim 16; It is characterized in that; Comprise the portion that inserts in the frequency direction, the portion that inserts in this frequency direction inserts in frequency direction is carried out the transmission line property data of utilizing the portion that inserts in the said time orientation in time orientation has carried out, to insert

21. one kind postpones distribution generation method, the digital broacast receiver that this delay distribution generation method utilization receives the signal behind the OFDM generates the distribution of reception delay of signals, and this delay distribution generation method is characterised in that, comprising:

Thereby, the orthogonal frequency-division multiplex singal that receives goes out the sub-carrier power data and these sub-carrier power data carried out inverse Fourier transform to generate first and postpone the step that distributes according to being carried out data computation after the Fourier transform by each transmission unit;

Thereby to the said orthogonal frequency-division multiplex singal that receives by each transmission unit carry out data extract after the Fourier transform go out pilot signal, with this pilot signal divided by given value obtain for the transmission line property data of the pilot signal of each transmission unit and to these transmission line property data in time orientation carries out, insert, to the transmission line property data after this time orientation carries out in, inserting carry out inverse Fourier transform generate second postpone distribution step;

With squinting the detection time of said first incoming wave that postpone to distribute so that said first postpone to distribute and the corresponding to step time of advent of the said second main ripple that postpone to distribute; And

Thereby keep the value more than first the defined threshold in postponing to distribute that is squinted for said second detection time in postpone distributing with said incoming wave the corresponding value time of advent, will replace to not the value handled as incoming wave with the corresponding value time of advent and distribute and the step of output as the delay of the said orthogonal frequency-division multiplex singal that receives less than the value of said threshold value.

22. one kind postpones distribution generation method, the digital broacast receiver that this delay distribution generation method utilization receives the signal behind the OFDM generates the distribution of reception delay of signals, and this delay distribution generation method is characterised in that, comprising:

With squinting the detection time of said first incoming wave that postpone to distribute so that the 3rd postpone to distribute and the corresponding to step time of advent of the first main ripple that postpones to distribute that generates by the said first inverse Fourier transform portion, the incoming wave that the wherein said the 3rd postpones to distribute in being to postpone to distribute with said second detection time scope content copy to respectively that the front and back of this of scope form detection time; And

Thereby keep the value more than first the defined threshold in postponing to distribute that is squinted for the said the 3rd detection time in postpone distributing with said incoming wave the corresponding value time of advent, will replace to not the value handled as incoming wave with the corresponding value time of advent and distribute and the step of output as the delay of the said orthogonal frequency-division multiplex singal that receives less than the value of said threshold value.

23. one kind postpones distribution generation method, the digital broacast receiver that this delay distribution generation method utilization receives the signal behind the OFDM generates the distribution of reception delay of signals, and this delay distribution generation method is characterised in that, comprising:

First postpone to be distributed that value with said second corresponding time of advent of postponing to distribute multiplies each other that thereby delay as the said orthogonal frequency-division multiplex singal that receives distributes and the step exported with what squint the detection time of said incoming wave.

24. one kind postpones distribution generation method, the digital broacast receiver that this delay distribution generation method utilization receives the signal behind the OFDM generates the distribution of reception delay of signals, and this delay distribution generation method is characterised in that, comprising:

With squinting the detection time of said first incoming wave that postpone to distribute so that the 3rd postpone to distribute and the corresponding to step time of advent of the said first main ripple that postpone to distribute, the incoming wave that the wherein said the 3rd postpones to distribute in being to postpone to distribute with said second detection time scope content copy to respectively that the front and back of this of scope form detection time; And

First postpone to be distributed that value with the said the 3rd corresponding time of advent of postponing to distribute multiplies each other that thereby delay as the said orthogonal frequency-division multiplex singal that receives distributes and the step exported with what squint the detection time of said incoming wave.