CN105917604A - Receiver and reception method - Google Patents
Receiver and reception method Download PDFInfo
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- CN105917604A CN105917604A CN201480073453.5A CN201480073453A CN105917604A CN 105917604 A CN105917604 A CN 105917604A CN 201480073453 A CN201480073453 A CN 201480073453A CN 105917604 A CN105917604 A CN 105917604A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
- H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
- H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- Computer Networks & Wireless Communication (AREA)
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- Power Engineering (AREA)
- Noise Elimination (AREA)
Abstract
A receiver and a reception method which are provided by the invention determine sub-bands including incoming wave components detected on the basis of a delay profile. If there is an overlap in non-stopband frequency characteristics between filters that adjacent sub-bands pass through, a sub-band including these sub-bands is determined. A frequency interpolation filter unit (4) having a passband set through which the determined sub-band passes limits the band of an output signal of a time interpolation filter unit (3) and interpolates channel characteristics in the frequency direction.
Description
Technical field
The present invention relates to reception device and the method for reseptance of OFDM (hereinafter referred to as OFDM) signal.
Background technology
Such as, in the signal transmission system of the received terrestrial digital broadcasting modes such as ISDB-T and DVB-T, in sending side by known
Pilot frequency carrier wave distribute to transmit signal so that can easily receive side calculate transmission channel characteristic.For such letter
Number transmission system, the projection accuracy of transmission channel is very big to receiving performance impact, therefore, correctly calculates biography according to pilot frequency carrier wave
Defeated channel is critically important.
It addition, propose various mode at the technical elements utilizing pilot frequency carrier wave.For example, as it is known that reception technique
Have: be assigned with at certain intervals in the signal transmission system of pilot frequency carrier wave on the time orientation and frequency direction of transmission signal,
After achieving for the transmission channel estimated value of pilot frequency carrier wave, signal is demodulated.
Known technology also has: in the case of using insertion wave filter to calculate transmission channel, filtered by insertion with suppression
The mode of the noise contribution of ripple device improves the projection accuracy of transmission channel, thus improves receptivity.Such as, patent documentation 1
Determine to insert filter on the basis of disclosing the incoming wave that in the incoming wave sending signal occurred in transmission channel, time delay is the longest
The technology of the passband of ripple device.
In the device that patent documentation 1 is recorded, owing to receiving the radio-frequency component quilt after the maximum delay time that signal is comprised
Suppression, accordingly, it is capable to reduce the noise contribution of residual in the transmission channel estimated value obtained as inserting result.
The technology carrying out insertion process is processed by multirate filter it addition, Patent Document 2 discloses, described many
Rate filter processes and uses the wave filter that input signal is divided into multiple sub-band respectively, and only by required signal component
It is reconstructed.
Further, Patent Document 3 discloses to the multiple different bands of each incoming wave extrapolated according to delay spectrum lead to
Wave filter carries out the technology of the insertion of frequency direction.It addition, in patent documentation 3, time orientation is inserted by each incoming wave
The output signal of wave filter is filtered, and the output of these wave filter is added (synthesis), it is thus possible to obtain desired transmission
Channel calculates result.Accordingly, it is capable to control frequency direction to insert the passband of wave filter, and suppress noise contribution.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open 10-75226 publication
Patent documentation 2: Japanese Patent Laid-Open 2000-286821 publication
Patent documentation 3: Japanese Patent Laid-Open 2010-246024 publication
Summary of the invention
Invention to solve the technical problem that
In the technology of patent documentation 1, insert wave filter and be made up of low pass filter, the high frequency after maximum delay time
Composition is suppressed, but is contained within the noise contribution beyond desired signal composition in its passband.Accordingly, there exist noise suppressed effect
The most insufficient problem.
It addition, as patent documentation 1, patent documentation 2 is to push away about the frequency response after suppressing maximum delay time
The technology of calculation value.It addition, process to realize multirate filter as described in Patent Document 2, it is necessary to multiple wave filter are constituted
Multistage.Therefore, in order to accomplish to copy the structure of the various wave environments of reality, circuit scale increases or operand becomes
Huge, there is the problem being difficult to.
Further, in the prior art disclosed in patent documentation 3, use and close again after each band filter works independently
Become the structure of their output.Therefore, because of the delay spectrum of transmission channel and the frequency characteristic of each band filter and at wave filter
The synthesis result of output remains and required above carrys out wave component, exist and can not obtain correct transmission channel reckoning result
Problem.
Such as, if the transition region between the passband and stopband of band filter has incoming wave component residue, then this is residual
Retained branch causes the filter gain for each incoming wave not become desired gain.Thus as a result of which it is, transmission channel pushes away
Calculate the characteristic that result becomes different from actual transmission channel, the degradation of demodulated signal.Easily at adjacent band filter
Passband vicinity occur that the transition region of this band filter has the phenomenon of incoming wave component residue.
If further, make the transition region of band filter have the most precipitous characteristic, then can avoid to a certain extent
Above-mentioned Quality Down.But, the tap number of wave filter is limited, even if making, transition region is narrow there is also boundary.It addition,
Under conditions of filter tap number is limited, the frequency characteristic of transition region is the most precipitous, and the ripple of passband is the biggest, cannot fill
Point guarantee the attenuation in stopband, need that the situation such as above-mentioned is carried out balance and consider.
Owing to there is such new problem, this is not the plan of basic solution.
The present invention is to solve that above-mentioned technical problem proposes, its object is to obtain can accurately press down with easy structure
The noise contribution of transmission channel processed also improves reception device and the method for reseptance of receptivity.
For solving the means of technical problem
Reception device involved in the present invention be for receive be assigned on time orientation and frequency direction known
The reception device of the ofdm signal of pilot frequency carrier wave, described reception device includes: Fourier transformation portion, and this Fourier transformation portion is often
In individual OFDM symbol, the docking collection of letters number carries out discrete Fourier transform, and exports；Pilot frequency carrier wave extraction unit, this pilot frequency carrier wave
Extraction unit extracts the signal corresponding with pilot frequency carrier wave from the output signal in Fourier transformation portion, and exports；Time inserts
Wave filter portion, this time insertion wave filter portion inserts output signal based on pilot frequency carrier wave extraction unit on time orientation and calculates
Transmission channel characteristic that go out, for pilot frequency carrier wave, and export；Delay spectrum test section, this delay spectrum test section is from the time
Insert the delay spectrum detecting transmission channel in the output signal in wave filter portion, and export；Passband determination section, this passband
With determination section output signal based on delay spectrum test section detect transmission channel carry out wave component and decision comprises this incoming wave
The sub-band of composition, and, the frequency characteristic between the wave filter making adjacent sub-band pass through respectively exists stopband with
In the case of outer lap, determine to comprise respectively the sub-band of each sub-band；Frequency inserts wave filter portion, and this frequency is inserted
Entering wave filter portion and set the passband that the sub-band making passband determination section be determined passes through, the time that limits inserts wave filter portion
The frequency band of output signal also inserts the transmission channel characteristic for pilot frequency carrier wave in a frequency direction；And equilibrium portion, this equilibrium
The output signal in Fourier transformation portion is inserted the output signal in wave filter portion by portion divided by frequency, and enters relative to each subcarrier
Row demodulation.
The effect of invention
According to the present invention, have the effect that and can accurately suppress the noise contribution of transmission channel also with easy structure
Improve receptivity.
Accompanying drawing explanation
Fig. 1 is the block diagram representing the structure receiving device involved by embodiment of the present invention 1.
Fig. 2 is the figure of the configuration example representing pilot frequency carrier wave.
Fig. 3 is the flow chart representing the action receiving device involved by embodiment 1.
Fig. 4 is the block diagram of the structure representing that the frequency in embodiment 1 inserts wave filter portion.
Fig. 5 is the figure representing wave filter output spectrum.
Fig. 6 is the figure of the example representing delay spectrum.
Fig. 7 is the block diagram of the structure representing the filter coefficient generating unit in embodiment 1.
Fig. 8 is the block diagram of the structure representing the passband determination section in embodiment 1.
Fig. 9 is the figure of the testing result representing delay spectrum with carrying out wave component.
Figure 10 is to represent that the decision of the passband made with passband determination section processes (to there is not to come wave component in transition region
Time) and the figure of data that obtains.
Figure 11 is the figure representing delay spectrum when there is to come wave component in the transition region between adjacent filter.
Figure 12 is to represent that the decision of the passband made with passband determination section processes (when transition region exists to come wave component) and obtains
The figure of the data arrived.
Figure 13 is the block diagram of the structure representing that the frequency in embodiment of the present invention 2 inserts wave filter portion.
Detailed description of the invention
Hereinafter, in order to the present invention will be described in more detail, it is described with reference to the mode for implementing the present invention.
Embodiment 1
Fig. 1 is the block diagram representing the structure receiving device involved by embodiment of the present invention 1.Reception device shown in Fig. 1 is
Receive the reception device of ofdm signal.In sending side, with QAM (quadrature amplitude modulation) or QPSK (quadriphase PSK) to sending number
According to carrying out primary modulation, and by being assigned with the OFDM transmission of pilot frequency carrier wave on time orientation and frequency direction at certain intervals
Mode is transmitted.
Fourier transformation portion 1 carries out discrete Fu to the reception signal S1 being converted to baseband in each OFDM symbol
In leaf transformation exporting.Further, each sub-carrier component being transmitted in an ofdm fashion is as defeated from Fourier transformation portion 1
The frequency-region signal that goes out and obtain.
Pilot frequency carrier wave extraction unit 2 extracts the signal corresponding with pilot frequency carrier wave also from the output signal in Fourier transformation portion 1
Export.Such as, in the received terrestrial digital broadcasting of ISDB-T and DVB-T etc., as in figure 2 it is shown, in time orientation (symbol side
To) on every 4 symbols, frequency direction (carrier wave direction) inserts known pilot frequency carrier waves every 12 carrier waves.Transmission letter
The reckoning of road characteristic realizes pushing away for the transmission channel of pilot frequency carrier wave by carrying out inserting on time orientation and frequency direction
Calculate result.
Time insert wave filter portion 3 insert on time orientation with output signal based on pilot frequency carrier wave extraction unit 2 and push away
The transmission channel characteristic that the pilot frequency carrier wave that calculates is corresponding.
Such as, the time insert wave filter portion 3 by the reception signal (Fourier transformation output valve) corresponding with pilot frequency carrier wave divided by with
The known signal that this pilot frequency carrier wave is corresponding, to extrapolate the transmission channel characteristic corresponding with this pilot frequency carrier wave.Then, to each phase
Same subcarrier frequency is inserted the transmission channel characteristic corresponding with this pilot frequency carrier wave on time orientation and exports.
Frequency is inserted wave filter portion 4 and is set and make the passband that the sub-band determined by passband determination section 6 passes through, pair time
Between insert the output signal in wave filter portion 3 and carry out frequency band restriction, and insert the transmission for pilot frequency carrier wave in a frequency direction and believe
Road characteristic.It is to say, the transmission channel characteristic that time insertion wave filter portion 3 is inserted on time orientation is also in frequency direction
On by frequency insert wave filter portion 4 insert, thus obtain whole subcarrier transmission channel characteristic calculate result.
Delay spectrum test section 5 inserts the delay spectrum detecting transmission channel the output signal in wave filter portion 3 from the time.Example
As, the output signal that the time inserts wave filter portion 3 carries out inverse discrete Fourier transform, each letter in reply that will be obtained by this conversion
Number the square value of amplitude as delay spectrum.
Passband determination section 6 output signal based on delay spectrum test section 5 detects the wave component that comes of transmission channel, and
Determine to comprise this partial-band carrying out wave component i.e. sub-band.
Such as, the transmission signal that arrives after detecting in transmission channel repeated reflection or diffraction based on delay spectrum (it is following,
Also referred to as incoming wave) the time of advent and performance number, and determine to comprise the detected frequency band (sub-band) carrying out wave component.
Further, the passband passing through the sub-band making passband determination section 6 be determined is controlled so that have and make based on prolonging
Late spectrum and detect whole come wave component by required and enough bandwidth.
Therefore, passband is not limited to one, likely can there is two or more passband according to the situation of transmission channel.Passband
The frequency band comprising to come wave component is set to sub-band by determination section 6, and controls information and skew control according to wave filter classification described later
Information processed sets the passband making sub-band pass through in frequency inserts wave filter portion 4.
It addition, there is the weight beyond stopband in frequency characteristic between the wave filter making adjacent sub-band pass through respectively
In the case of folded part, passband determination section 6 determines to comprise respectively the sub-band of these sub-bands again.
Further, the lap beyond so-called stopband is equivalent to the overlap between the passband in the frequency characteristic between wave filter
Partly, any one portion in the lap of passband and transition region and transition region lap these three part each other
Point.In the case of there is this lap, identical come wave component in adjacent wave filter separately by, there is filter
Ripple device gain does not reaches the probability of desired gain.In this case, its result be transmission channel calculate result become with
The characteristic that actual transmission channel is different, the degradation of demodulated signal.
Therefore, if there is above-mentioned lap, passband determination section 6 determines to comprise respectively the son frequency of adjacent sub-bands the most again
Band.
The output signal in Fourier transformation portion 1 is inserted the output signal in wave filter portion 4 by equilibrium portion 7 divided by frequency, relatively
It is demodulated in each subcarrier.Thus, obtain each subcarrier demodulated signal S2 and backward level export.
Further, Fourier transformation portion 1, pilot frequency carrier wave extraction unit 2, time insertion wave filter portion 3, frequency insertion wave filter portion
4, delay spectrum test section 5, passband determination section 6 and equilibrium portion 7 can realize as hardware circuit.It addition, such as by miniature
Computer performs to be written with the program of the distinctive process of the present invention, thus said structure key element 1～7 can also be as hardware and soft
The concrete unit that part combines realizes.
Then, action is illustrated.
Fig. 3 is the flow chart representing the action receiving device involved by embodiment 1.
First, Fourier transformation portion 1 docks collection of letters S1 in each OFDM symbol and carries out discrete Fourier transform (step
ST1)。
Then, pilot frequency carrier wave extraction unit 2 is extracted from the output signal in Fourier transformation portion 1 and receives leading included in signal
Frequently carrier wave is corresponding signal also carries out exporting (step ST2).
Time inserts wave filter portion 3 output signal based on pilot frequency carrier wave extraction unit 3 and calculates the transmission channel for pilot frequency carrier wave
Characteristic, and each subcarrier is inserted on time orientation the transmission channel characteristic (step ST3) extrapolated.
Then, the time is inserted the output signal in wave filter portion 3 and carries out inverse discrete Fourier transform by delay spectrum test section 5, and will
The square value of the amplitude of the complex signal obtained by this conversion carries out exporting (step ST4) as delay spectrum.
Passband determination section 6 output signal based on delay spectrum test section 5 determines to comprise detected transmission respectively
The sub-band carrying out wave component of channel, and in frequency inserts wave filter portion 4, set the passband making determined sub-band pass through
Band (step ST5).
Further, there is the lap beyond stopband in frequency characteristic between the wave filter making adjacent sub-bands pass through respectively
In the case of, passband determination section 6 determines to comprise respectively the sub-band of these sub-bands again.
Frequency is inserted wave filter portion 4 and is set the passband that the sub-band making passband determination section 6 be determined passes through, to the time
The output signal inserting wave filter portion 3 carries out frequency band restriction, and inserts the transmission channel for pilot frequency carrier wave in a frequency direction
Characteristic (step ST6).
Also utilize frequency to insert wave filter portion 4 to insert in a frequency direction by institute on time orientation of time insertion wave filter portion 3
The transmission channel characteristic inserted, and the transmission channel characteristic of whole subcarriers is calculated that result exports to equilibrium portion 7.
Hereafter, the output signal that the output signal in Fourier transformation portion 1 inserts wave filter portion 4 divided by frequency is carried out phase by equilibrium portion 7
Each subcarrier is demodulated, and exports demodulated signal S2 (step ST7) of each subcarrier.
Then, structure and detailed action with regard to the frequency insertion wave filter portion 4 in embodiment 1 illustrate.Fig. 4 is table
Show that the frequency in embodiment 1 inserts the block diagram of the structure in wave filter portion, it is possible to achieve make most three sub-bands pass through respectively
Three band filters.As shown in Figure 4, the insertion of the frequency in embodiment 1 wave filter portion 4 includes sub-band filter portion
41a～41c, filter coefficient generating unit 42a～42c and output adder 43.
It is logical that sub-band filter portion 41a is that the filter coefficient generated based on filter coefficient generating unit 42a sets
Frequency band the output signal to time insertion wave filter portion 3 carry out the wave filter of frequency band restriction.Similarly, sub-band filter portion
41b sets passband, sub-band filter portion 41c base based on the filter coefficient that filter coefficient generating unit 42b is generated
The filter coefficient generated in filter coefficient generating unit 42c is to set passband, and is respectively inserted wave filter portion 3 time
Output signal carry out frequency band restriction.Further, sub-band filter portion 41a～41c is the mutually different wave filter of bandwidth.
Filter coefficient generating unit 42a controls information a from passband determination section 6 input filter classification and skew controls letter
Breath a, and generate and make to control information a and selected sub-band filter based on wave filter classification based on offset control information a
The filter coefficient of passband occurrence frequency skew.This filter coefficient such as becomes the wave filter constituting following band filter
Coefficient: i.e., for comprising the shortest first effective band filter of sub-band carrying out wave component time delay in delay spectrum.
Similarly, filter coefficient generating unit 42b generates and makes based on defeated from passband determination section 6 based on offset control information b
The wave filter classification that enters controls information b and the filter coefficient of the passband occurrence frequency skew of selected sub-band filter.
Such as, this filter coefficient becomes the filter coefficient constituting following band filter: i.e., for comprising time delay
Two short second the effective band filters of sub-band carrying out wave component.
Filter coefficient generating unit 42c generates and makes based on the filtering inputted from passband determination section 6 based on offset control information c
Device classification controls the filter coefficient of the passband occurrence frequency skew of information c and selected sub-band filter.
Such as, this filter coefficient becomes the filter coefficient constituting following band filter: i.e., short for time delay the 3rd
The effective band filter of the sub-band carrying out wave component.
Further, Fig. 4 shows the structure being adapted to most three sub-bands, but at one or two sub-band
In the case of being just enough to make all to come wave component to pass through, generate filter coefficient so that in sub-band filter portion 41a～41c
One or two sub-band filter portion become effective.It addition, utilize output adder 43 by sub-band filter portion 41a～
The output signal of 41c is added, and exports to equilibrium portion 7.
Then, the passband with regard to frequency insertion wave filter portion 4 illustrates.
Frequency insertion wave filter portion 4 is that the insertion process of the frequency direction for carrying out subcarrier obtains for whole subcarriers
The wave filter of estimated value of transmission channel characteristic.
Here, for calculating that the frequency of transmission channel characteristic is inserted wave filter portion 4 and needed to have to carry out wave component needed for making demodulation
The frequency band all passed through.
Meanwhile, also include not existing to come the frequency band of wave component in the passband of wave filter in the case of, owing to noise contribution passes through
Wave filter, therefore, the projection accuracy of transmission channel characteristic declines, and receptivity is deteriorated.This means preferably to realize to have
The frequency of the required passband of minimum inserts wave filter portion 4.
Such as, as shown in the delay spectrum of Fig. 5 (a), enumerate and entered being carried out wave component by two of main ripple and delay wave component
The example of the transmission channel of row transmission.Here, transverse axis represents to come the time of advent of wave component, and the longitudinal axis represents its power.The most right
In the case of the passband of frequency insertion wave filter is controlled, as shown in Fig. 5 (b), becomes and passband comprises whole incoming wave
The low pass filter of composition.In this case, although radio-frequency component is removed, but be in addition to beyond incoming wave composition also have heat make an uproar
Equally distributed many noise contributions on whole signal band such as sound pass through wave filter.
On the other hand, if the wave filter only making wave component pass through can be realized, then can significantly press down as shown in Fig. 5 (c)
Passing through of noise contribution processed.
In actual transmission channel, as Fig. 6 (a) be shown with exist multiple come wave component situation, it addition, as shown in Fig. 6 (b)
Also have occur because of multiple come wave component and produce postpone extension situation.Further, move while accept signal at reception device
In the case of, along with the movement receiving device, the moment changes transmission channel, therefore receives device and also to follow this adaptably
The change of the transmission channel of sample.
Frequency in embodiment 1 is inserted wave filter portion 4 and is included having multiple wave filter (sub-band filtering of different bandwidth
Device portion), select wave filter to make its passband occurrence frequency offset from these wave filter according to actual delay spectrum, thus only
The partial-band i.e. sub-band making wave component passes through.
In contrast, the existing frequency disclosed in patent documentation 1 is inserted in wave filter, as shown in Fig. 5 (b), constitutes low pass
Wave filter, makes passband comprise to come the longest composition time delay in wave component.Therefore, the time delay carrying out wave component is the longest logical
Frequency band more extension, the noise contribution in passband increases, it is impossible to obtain sufficient receptivity.
It addition, patent documentation 2 by multirate filter process only by the reconstruct of necessary signal component to realize
Desired frequency characteristic, but, the passband number making signal component pass through can increase, thus receive unit scale and increase, signal
Process becomes complicated.
In contrast, embodiment 1 sets following passband: (sub-band filters from multiple wave filter with different bandwidth
Device portion) in select the wave filter corresponding with the bandwidth of sub-band, and the passband of selected wave filter is carried out frequency shift (FS),
Wave component is made to pass through.
Therefore, compared with patent documentation 2, the present invention can be with the frequency characteristic desired by very easy structure acquisition.
Then, illustrate that frequency is inserted filter coefficient generating unit 42a in wave filter portion 4～the structure of 42c and moves with Fig. 7
Make.As it is shown in fig. 7, filter coefficient generating unit 42a～42c are configured to include that filter coefficient selection portion 421 and passband are inclined
Shifting portion 422.
Filter coefficient selection portion 421 selects base from the low pass filter of different bandwidth i.e. sub-band filter portion 41a～41c
The filter coefficient in the sub-band filter portion controlling information in wave filter classification and select.It is to say, wave filter classification control
Information processed is the information representing and selecting which kind of wave filter from sub-band filter portion 41a～41c of different bandwidth.
Such as, in the filter coefficient selection portion 421 of filter coefficient generating unit 42a, have input selection sub-band filtering
In the case of the wave filter classification of device portion 41a controls information a, select the filtering of the bandwidth etc. of regulation sub-band filter portion 41a
Device coefficient also outputs this to passband offset portion 422.
In passband offset portion 422, leading to of the sub-band filter portion selected controlling information based on wave filter classification
Band converted becomes the filter coefficient selected by filter coefficient selection portion 421, inclined to carry out frequency based on offset control information
In-migration makes frequency characteristic become desired passband.
Such as, offset control information is set and the mid frequency of passband is directed at desired sub-band obtained by sub-band center
The relevant mid frequency in wave filter portion.Filter coefficient is selected the low pass filter selected by portion 421 by passband offset portion 422
Filter coefficient and make the passband of this low pass filter with to the above-mentioned desired son frequency set by offset control information
The coefficient of the degree occurrence frequency skew of the mid frequency in band filter portion carries out complex multiplication.In this way, generate
The passband in the sub-band filter portion making to control information based on wave filter classification based on offset control information and select occurs
The filter coefficient of frequency shift (FS).Based on this filter coefficient, constitute the sub-band filter with desired passband
Portion.
Then, structure and action with regard to passband determination section 6 illustrate.
Fig. 8 is the block diagram of the structure representing the passband determination section in embodiment 1.As shown in Figure 8, passband determination section 6 structure
Become the incoming wave composition detection portion 61 that includes, sub-band offhand decision portion 62, wave filter classification control portion 63 and skew control portion 64.
Based on delay spectrum, incoming wave composition detection portion 61 detects whether that existence carrys out wave component and the time of advent is poor.Close then
No existence carrys out wave component, the most predetermined threshold value (hereinafter also referred to as power decision threshold) and the merit of each composition of delay spectrum
Rate value, the composition that will be greater than threshold value is judged to carry out wave component.For power decision threshold, such as performance number with maximum composition is
Benchmark determines.In this case, at the output signal i.e. delay spectrum of transmission channel of each delay spectrum test section 5 by more
Time new, power decision threshold is changed.Therefore, it is possible to judge whether that incoming wave becomes according to the change of wave environments
Point.
The time of advent difference by as by performed by delay spectrum test section 5 inverse discrete Fourier transform (hereinafter also referred to as
IFFT) index is expressed.Such as, in the case of detecting delay spectrum by the IFFT of 64, at each index of 0 to 63
On obtain IFFT result.The difference of this index is directly proportional to the difference of the time of advent carrying out wave component
Sub-band offhand decision portion 62 determines the son frequency carrying out wave component comprised detected by origin wave component test section 61
Band.Here, sub-band decision process is illustrated.Fig. 9 (a) is the example of the delay spectrum detected by delay spectrum test section 5
Son.In addition, it is assumed that frequency inserts three band filters that wave filter portion 4 can realize making most three sub-bands pass through respectively.
Meanwhile, incoming wave composition detection portion 61 is also configured to detect most three sub-bands.
Delay spectrum testing result shown in Fig. 9 (a) is compared by incoming wave composition detection portion 61 with power decision threshold, will
Whether existence carrys out wave component exports to sub-band offhand decision portion 62 as binary information.
As shown in Fig. 9 (b), the above-mentioned information that sub-band offhand decision portion 62 inputs based on always wave component test section 61, it is judged that
For being the interval T1 from 4 to 16 at IFFT index, the interval T2 from 40 to 43, being respectively present incoming wave from the interval T3 of 59 to 63
Composition, determines three partial-bands i.e. sub-band a, sub-band b, sub-band c and stores.Such as, to as shown in Figure 10 (a)
The sub-band title of sub-band a～c and the IFFT index of the passband the most corresponding with them store.
In wave filter classification control portion 63, generating wave filter classification and control information, this wave filter classification controls information choosing
Select bandwidth and can pass through the wave filter of the sub-band determined by sub-band offhand decision portion 62.
In embodiment 1, frequency is inserted wave filter portion 4 and is included that the different multiple low pass filters of passband width are (in Fig. 4
Sub-band filter portion 41a～41c), these low pass filters become the candidate's sub-band filter for making sub-band pass through.
It addition, be set with in wave filter classification control portion 63, frequency is inserted whole low-pass filtering that wave filter portion 4 is possessed
The list data that the identification information of device is corresponding with its passband width.
Figure 10 (b) illustrates an example of this list data.Figure 10 (b) represents passband width with IFFT index width.
Now illustrating wave filter classification and control the generation of information, wave filter classification control portion 63 is with reference to above table number
According to, from candidate's sub-band filter of the passband width with more than sub-band bandwidth, determine passband width the narrowest
Candidate's sub-band filter, and generate for selecting the wave filter classification of this candidate's sub-band filter to control information.
The most now frequency of the approximate centre of the mid frequency alignment sub-band of the passband of sub-band filter, but also
It is not limited.
Further, wave filter classification control portion 63 is by each sub-band selection sub-band filter, but different sub-band
Identical sub-band filter can also be selected.
Such as, in the case of Fig. 9 (b), the wave component that comes at first is contained in the sub-band of interval T1 that IFFT index is from 4 to 16
In a, the IFFT index width of sub-band a is 12.Therefore, with reference to the list data of Figure 10 (b), from the bandwidth with sub-band a
Above candidate's sub-band filter (sub-band filter C, D) selects candidate's sub-band filter that passband width is the narrowest
I.e. sub-band filter C.
It addition, the wave component that comes then arrived in Fig. 9 (b) is contained in the sub-band of interval T2 that IFFT index is from 40 to 43
In b, the IFFT index width of sub-band b is 3.Therefore, with reference to Figure 10 (b) list data from have the bandwidth of sub-band b with
On passband width candidate's sub-band filter (sub-band filter A～D) in select the narrowest candidate of passband width
Sub-band filter i.e. sub-band filter A.
Similarly, the wave component that comes that in Fig. 9 (b), time delay is the longest is contained in the interval T3 that IFFT index is from 59 to 63
In sub-band c, the IFFT index width of sub-band c is 4.Therefore, with reference to the list data of Figure 10 (b) from having sub-band c's
Candidate's sub-band filter (sub-band filter A～D) of passband width more than bandwidth select passband width the narrowest
Candidate's sub-band filter i.e. sub-band filter A.Figure 10 (c) illustrates these result of determination.
Skew control portion 64 generates offset control information, and described offset control information makes to control information based on wave filter classification
And the sub-band filter selected passband alignment sub-band and occurrence frequency skew.
Specifically, in order to low pass filter i.e. sub-band filter being changed over the band filter making sub-band pass through, sentence
Surely make the side-play amount that the passband occurrence frequency of this low pass filter offsets, each sub-band is generated and output offset controls letter
Breath, mid frequency when having carried out frequency shift (FS) with the side-play amount of result of determination is set by described offset control information.
Further, side-play amount can use IFFT exponential representation.
Such as, due to the sub-band a of interval T1 be IFFT index from 4 to 16, therefore the IFFT index at its center is 10.Also
That is, if by the IFFT index of the passband of sub-band filter C from 0 frequency shift (FS) to 10, then sub-band filter C
The mid frequency of passband is consistent with the center of sub-band a.Therefore, passband side-play amount (IFFT index) is 10.
Similarly, the sub-band b of interval T2 be IFFT index from 40 to 43, the IFFT index at its center is 41.Namely
Say, if by the IFFT index of the passband of sub-band filter A from 0 frequency shift (FS) to 41, then the passband of sub-band filter C
The mid frequency of band is consistent with the center of sub-band b.Therefore, passband side-play amount (IFFT index) is 41.
The sub-band c of interval T3 be also IFFT index from 59 to 63, therefore the IFFT index at its center is 61.Namely
Say, if by the IFFT index of the passable frequency of sub-band filter A from 0 frequency shift (FS) to 61, then sub-band filter A
The mid frequency of passband is consistent with the center of sub-band c.Therefore, passband side-play amount (IFFT index) is 61.These are sentenced
Determine result to collect and be shown in Figure 10 (d).
It addition, wave filter classification control portion 63 passes through based on the sub-band that makes determined by sub-band offhand decision portion 62
The passband width of sub-band filter and with making the frequency between the sub-band filter that the sub-band being adjacent passes through
Distance, judges whether to exist in the frequency characteristic between these sub-band filters the lap beyond stopband.If no
There is this lap, then wave filter classification control portion 63 uses the son frequency determined by sub-band offhand decision portion 62 in the same old way
Band, if there is above-mentioned lap, determines comprise the sub-band of adjacent sub-bands respectively and generate wave filter classification the most again
Control information, described wave filter classification controls information selection bandwidth can be by the low pass filter of this sub-band.
In the case of the interval of adjacent sub-bands is narrow, it is alternatively that be most suitable for the sub-band filter making each sub-band pass through
The result of ripple device, produces the lap beyond stopband in the frequency characteristic between sub-band filter.Shown in Figure 11
In example, at the sub-band filter BF1 making incoming wave 1 pass through and make to there is passband between the sub-band filter BF2 that incoming wave 2 passes through
Lap between band and transition region, remains wave component S12, S21 in these laps.
If there is the lap with transition region of high frequency side, the then incoming wave 2 that should pass through in sub-band filter BF2
Composition S12 also pass through in sub-band filter BF1, if there is the lap with transition region of side, low territory, then should be
The composition S21 of the incoming wave 1 passed through in sub-band filter BF1 also passes through in sub-band filter BF2.In this case,
Frequency is inserted in the output in wave filter portion 4, has exceeded the incoming wave remaining in lap compared with desired signal level
The part of composition, it is impossible to obtain the reckoning result of correct transmission channel.When there is lap each other in passband
Or when transition region exists lap each other it can also happen that this problem.
Therefore, in the present invention, in the frequency characteristic between the sub-band filter making adjacent sub-bands pass through respectively
In the case of there is the lap beyond stopband, determiner frequency band again so that these sub-bands become a sub-band.
Here, in case of determining the such as sub-band shown in Figure 12 (a), come subbands offhand decision portion 62 to make specifically
Explanation.When have input the result of Figure 12 (a), wave filter classification control portion 63 selects with reference to the list data of Figure 10 (b)
Suitably sub-band filter.The IFFT index that sub-band a is passband in Figure 12 (a) is from the interval of 4 to 16, and its IFFT refers to
SerComm degree is 12, therefore selects the sub-band filter C of Figure 10 (b).On the other hand, the IFFT index width of sub-band b, c is
2, therefore select the sub-band filter A that IFFT index width is 5 of passband.
When making sub-band pass through desired band filter by sub-band filter (low pass filter) composition, make son
The center of the mid frequency alignment sub-band of the passband of band filter.
Such as, sub-band b is centered by IFFT index 42, if making the mid frequency alignment of the passband of sub-band filter A be somebody's turn to do
Center, then make the passband of the sub-band filter A that sub-band b passes through become the interval that IFFT index is from 40 to 44.
It addition, sub-band c is centered by IFFT index 46, if making the mid frequency alignment of the passband of sub-band filter A be somebody's turn to do
Center, then make the passband of the sub-band filter A that sub-band c passes through become the interval that IFFT index is from 44 to 48.
Therefore, at IFFT index 44, the passband of two wave filter coincides.
In this case, as shown in Figure 12 (b), wave filter classification control portion 63 determiner frequency band again.It is to say,
By again determining to comprise the sub-band b of sub-band c, sub-band b is set to IFFT index from the interval of 41 to 47, and by son frequency
Band c is set to need not.Hereafter, the IFFT index width of new sub-band b is 6, and therefore wave filter classification control portion 63 is with reference to Figure 10
B the list data of () reselects sub-band filter B.
The IFFT index of new sub-band b is from 41 to 47, and therefore the IFFT index at its center is 44.If it is to say, will
The passband of sub-band filter B carries out the frequency shift (FS) that IFFT index is from 0 to 10, then the passband of sub-band filter B
Mid frequency is consistent with the center of new sub-band b.Therefore, skew control portion 64 judge passband side-play amount (IFFT index) as
44.Figure 12 (d) shows this result of determination.
As it has been described above, according to present embodiment 1, it is possible to achieve leading to of the sub-band only passband determination section 6 determined
Band setting inserts the easy structure in wave filter portion 4 to frequency.
Further, since each sub-band is constituted sub-band filter, therefore, it is possible to suppress the noise of transmission channel to become exactly
Divide thus improve receptivity.
Further, the frequency characteristic between the sub-band filter making adjacent sub-band pass through respectively exists beyond stopband
In the case of lap, determining to comprise respectively the sub-band of these sub-bands, therefore, the wave component that comes in lap will not
It is detected repeatedly, receptivity can be made to improve.
It addition, according to present embodiment 1, frequency inserts the sub-band filter that wave filter portion 4 includes having different bandwidth
Portion 41a～41c, passband determination section 6 selects the wave filter making sub-band pass through from sub-band filter portion 41a～41c, and
Set its passband.By so using said structure, institute can be obtained with extremely easy structure compared with patent documentation 2
Desired frequency characteristic.
Further, according to present embodiment 1, by the mid frequency of the passband of sub-band filter is directed at sub-band
Center, can make incoming wave composition accurately pass through.
Embodiment 2
Figure 13 is the block diagram of the structure representing that the frequency in embodiment of the present invention 2 inserts wave filter portion, can realize making most three
Three band filters that individual sub-band passes through respectively.As shown in figure 13, frequency insertion wave filter portion 4A is configured to include filtering
Device coefficient generating unit 42a～42c, filter process portion 44 and filter coefficient adder 45.
Further, in fig. 13, the structural element identical with Fig. 4 being marked identical label, its explanation is omitted.
Filter process portion 44 is to set logical based on the filter coefficient being carried out being added by filter coefficient adder 45
Frequency band the output signal to time insertion wave filter portion 3 carry out the wave filter of frequency band restriction.
The filter coefficient that filter coefficient generating unit 42a～42c are generated by filter coefficient adder 45 is added.Concrete and
Speech, is carried out each filter coefficient being exported filter coefficient generating unit 42a～42c by each filter tap coefficients
It is added and exports.Being output into of filter coefficient adder 45 makes desired sub-band signal composition pass through and suppress
The transmission channel estimated value of noise contribution.
As it has been described above, according to present embodiment 2, frequency is inserted wave filter portion 4A and is included: filter coefficient generating unit 42a～
42c, this filter coefficient generating unit 42a～42c generate and make to control information based on wave filter classification based on offset control information
And the filter coefficient of the passband occurrence frequency skew of the wave filter selected；Filter coefficient adder 45, this wave filter system
The filter coefficient that filter coefficient generating unit 42a～42c are generated by number adder 45 is added；And filter process portion
44, this filter process portion 44 sets passband based on the filter coefficient after being added by filter coefficient adder 45
Band, the output signal that the time inserts wave filter portion 3 carries out frequency band restriction and outputs this to equilibrium portion 7.Above-mentioned by using
Structure, can obtain and insert the function as wave filter portion 4 with the frequency in embodiment 1, and, can reduce compared with its structure
Circuit scale or operand.
Further, the present invention can be within the scope of the invention by each embodiment independent assortment, or to each embodiment
Arbitrary structural element deform, or in each embodiment, omit arbitrary structural element.
Industrial practicality
Reception device involved in the present invention can suppress the noise contribution of transmission channel also exactly with easy structure
Improve receptivity, therefore, be suitably applied the vehicle-mounted receiver such as receiving received terrestrial digital broadcasting by OFDM mode.
Label declaration
1 Fourier transformation portion
2 pilot frequency carrier wave extraction units
3 times inserted wave filter portion
4,4A frequency inserts wave filter portion
5 delay spectrum test sections
6 passband determination sections
7 equilibrium portions
41a～41c sub-band filter portion
42a～42c filter coefficient generating unit
43 output adders
44 filter process portions
45 filter coefficient adders
61 incoming wave composition detection portions
62 sub-band offhand decision portions
63 wave filter classification control portions
64 skew control portions
421 filter coefficient selection portions
422 passband offset portion
Claims (6)
1. receiving a device, described reception device receives and is assigned with known pilot frequency carrier wave on time orientation and frequency direction
Ofdm signal, it is characterised in that including:
Fourier transformation portion, this Fourier transformation portion docks the collection of letters in each OFDM symbol and number carries out discrete Fourier transform,
And export；
Pilot frequency carrier wave extraction unit, this pilot frequency carrier wave extraction unit is extracted from the output signal in described Fourier transformation portion and is led with described
Frequently the signal that carrier wave is corresponding, and export；
Time inserts wave filter portion, and this time inserts wave filter portion and inserts on time orientation based on described pilot frequency carrier wave extraction unit
Output signal and extrapolate, for the transmission channel characteristic of described pilot frequency carrier wave, and export；
Delay spectrum test section, this delay spectrum test section inserts from the described time and detects transmission letter the output signal in wave filter portion
The delay spectrum in road, and export；
Passband determination section, this passband determination section output signal based on described delay spectrum test section detects described transmission
Channel carry out wave component and decision comprises this sub-band carrying out wave component, and, pass through making adjacent described sub-band respectively
Wave filter between frequency characteristic in there is the lap beyond stopband in the case of, determine comprise each sub-band respectively
Sub-band；
Frequency inserts wave filter portion, and this frequency is inserted wave filter portion and set the described son frequency making described passband determination section be determined
The passband that band passes through, the output signal that the described time inserts wave filter portion carries out frequency band restriction, and inserts in a frequency direction
Enter the transmission channel characteristic for described pilot frequency carrier wave；And
Equilibrium portion, the output signal in described Fourier transformation portion is inserted the output in wave filter portion by this equilibrium portion divided by described frequency
Signal, and be demodulated relative to each subcarrier.
Receive device the most as claimed in claim 1, it is characterised in that
Described passband determination section includes:
Incoming wave composition detection portion, this incoming wave composition detection portion output signal based on described delay spectrum test section detects whether to deposit
Described come wave component and the time of advent poor；
Sub-band offhand decision portion, this sub-band offhand decision portion determines to comprise coming detected by described incoming wave composition detection portion
The sub-band of wave component；
Wave filter classification control portion, this wave filter classification control portion generates for selecting the filtering with the wave filter of following bandwidth
Device classification controls information, i.e. the bandwidth that the described sub-band that described sub-band offhand decision portion can be made to be determined passes through, and,
There is the overlapping portion beyond stopband in the frequency characteristic between the described wave filter making adjacent described sub-band pass through respectively
In the case of Fen, generate for selecting the wave filter classification with the wave filter of following bandwidth to control information, i.e. can make to wrap respectively
The bandwidth that sub-band containing each sub-band passes through；And
Skew control portion, this skew control portion generates offset control information, and described offset control information makes based on described wave filter
The passband of wave filter that classification controls information and selects is directed at described sub-band to carry out frequency shift (FS),
Described frequency is inserted wave filter portion and is set make based on described wave filter classification control information and described offset control information
The passband that described sub-band passes through.
Receive device the most as claimed in claim 2, it is characterised in that
Described frequency is inserted wave filter portion and is included:
Multiple wave filter, the plurality of wave filter has different bandwidth；
Filter coefficient generating unit, this filter coefficient generating unit generates filter coefficient, and described filter coefficient makes based on institute
The passband of the wave filter stating wave filter classification control information and select carries out frequency shift (FS) based on described offset control information；
And
Output adder, this output adder by with in the plurality of wave filter, set based on described filter coefficient
The described time is inserted the output signal in wave filter portion and has carried out the results added after frequency band limits by the wave filter of passband, and
Result output after will add up is to described equilibrium portion.
Receive device the most as claimed in claim 2, it is characterised in that
Described frequency is inserted wave filter portion and is included:
Multiple filter coefficient generating units, the plurality of filter coefficient generating unit generates filter coefficient, described filter coefficient
The passband of the wave filter making to control information based on described wave filter classification and select is carried out based on described offset control information
Frequency shift (FS)；
Filter coefficient adder, the filtering that the plurality of filter coefficient generating unit is generated by this filter coefficient adder
Device coefficient is added；And
Wave filter, this wave filter sets passband based on the filter coefficient after being added by described filter coefficient adder
Band, the output signal that the described time inserts wave filter portion carries out frequency band restriction, and outputs this to described equilibrium portion.
Receive device the most as claimed in claim 2, it is characterised in that
Skew control portion generates the center frequency of the passband of the wave filter making to control information based on described wave filter classification and select
Rate is directed at the information at the center of described sub-band, using as described offset control information.
6. a method of reseptance, described method of reseptance receives and is assigned with known pilot frequency carrier wave on time orientation and frequency direction
Ofdm signal, it is characterised in that comprise the steps:
Fourier transformation portion docks the collection of letters number in each OFDM symbol and carries out discrete Fourier transform, and exports；
Pilot frequency carrier wave extraction unit extracts the signal corresponding with described pilot frequency carrier wave from the output signal in described Fourier transformation portion,
And export；
Time inserts wave filter portion and inserts output signal based on described pilot frequency carrier wave extraction unit on time orientation and extrapolate
, for the transmission channel characteristic of described pilot frequency carrier wave, and export；
Delay spectrum test section inserts the delay spectrum detecting transmission channel the output signal in wave filter portion from the described time, goes forward side by side
Row output；
What passband determination section output signal based on described delay spectrum test section detected described transmission channel carrys out wave component also
Determine to comprise this sub-band carrying out wave component, and, the frequency between the wave filter making adjacent described sub-band pass through respectively
In the case of rate characteristic exists the lap beyond stopband, determine to comprise respectively the sub-band of each sub-band；
Frequency is inserted wave filter portion and is set the passband that the described sub-band making described passband determination section be determined passes through, to institute
Time of stating inserts the output signal in wave filter portion and carries out frequency band restriction, and inserts in a frequency direction for described pilot frequency carrier wave
Transmission channel characteristic；And
The output signal in described Fourier transformation portion is inserted the output signal in wave filter portion, and phase by equilibrium portion divided by described frequency
Each subcarrier is demodulated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2014/050807 WO2015107677A1 (en) | 2014-01-17 | 2014-01-17 | Receiver and reception method |
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| CN105917604A true CN105917604A (en) | 2016-08-31 |
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| JP (1) | JP5896393B2 (en) |
| CN (1) | CN105917604B (en) |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842982A (en) * | 2004-05-07 | 2006-10-04 | 松下电器产业株式会社 | OFDM receiver apparatus and OFDM receiving method |
| CN101079862A (en) * | 2006-05-24 | 2007-11-28 | 富士通株式会社 | OFDM receiver |
| US20090285086A1 (en) * | 2008-05-15 | 2009-11-19 | Fujitsu Microelectronics Limited | OFDM Receiver and OFDM Receiving Method |
| CN102316066A (en) * | 2010-06-29 | 2012-01-11 | 株式会社东芝 | The OFDM receiving system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006311385A (en) * | 2005-04-28 | 2006-11-09 | Toshiba Corp | Receiving device |
| JP2007202081A (en) * | 2006-01-30 | 2007-08-09 | Sony Corp | Ofdm demodulator and ofdm demodulation method |
| JP4412387B2 (en) * | 2007-10-30 | 2010-02-10 | ソニー株式会社 | Receiving device, receiving method, and program |
| JP2010246024A (en) * | 2009-04-09 | 2010-10-28 | Fujitsu Ltd | Demodulation device |
-
2014
- 2014-01-17 CN CN201480073453.5A patent/CN105917604B/en active Active
- 2014-01-17 WO PCT/JP2014/050807 patent/WO2015107677A1/en active Application Filing
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842982A (en) * | 2004-05-07 | 2006-10-04 | 松下电器产业株式会社 | OFDM receiver apparatus and OFDM receiving method |
| CN101079862A (en) * | 2006-05-24 | 2007-11-28 | 富士通株式会社 | OFDM receiver |
| US20090285086A1 (en) * | 2008-05-15 | 2009-11-19 | Fujitsu Microelectronics Limited | OFDM Receiver and OFDM Receiving Method |
| CN102316066A (en) * | 2010-06-29 | 2012-01-11 | 株式会社东芝 | The OFDM receiving system |
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| Publication number | Publication date |
|---|---|
| CN105917604B (en) | 2017-07-04 |
| DE112014006186B4 (en) | 2020-12-31 |
| WO2015107677A1 (en) | 2015-07-23 |
| JPWO2015107677A1 (en) | 2017-03-23 |
| DE112014006186T5 (en) | 2016-09-29 |
| JP5896393B2 (en) | 2016-03-30 |
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