CN105704077B - Receiving system, multi-carrier signal frequency band detection method and its demodulation device - Google Patents
Receiving system, multi-carrier signal frequency band detection method and its demodulation device Download PDFInfo
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Abstract
Receiving system, multi-carrier signal frequency band detection method and its demodulation device.Wherein, each carrier signal has the multiple symbols for respectively corresponding multiple times, and frequency band detection method includes: the Whole frequency band range according to carrier signal to define frequency sweep regional scope；In frequency sweep regional scope, symbol is referred to so that each symbol for obtaining each carrier signal is corresponding according to time offset value and frequency offseting value；These symbols according to each carrier signal carry out arithmetical operation with reference to symbol with corresponding with the corresponding control information of the carrier frequency for generating each carrier signal；Also, the Whole frequency band range of carrier signal is adjusted according to the corresponding control information of carrier signal.
Description
Technical field
The present invention relates to a kind of receiving system, multi-carrier signal demodulation device and its multi-carrier signal frequency bands to detect
Method, and the deviant between in particular to a kind of function by pilot tone carries out the estimation of frequency band.
Background technique
With the evolution of electronics technology, the transmission bandwidth of audio and video information is significantly promoted, and the digital audio-video of high quality is believed
Number transmission demand be consequently increased.
Need to transmit the video-audio signal of a variety of different-formats in cable television system now, on transmission line.Citing comes
It says, on the same transmission line, cable television system now may need to transmit the video-audio signal of analog-modulated, single carrier tune
Cable digital TV video broadcasting (Digital-Video Broadcasting-Cable, the DVB-C) signal and overloading of system
Second generation cable digital TV video broadcasting (the Digital-Video Broadcasting-Second of wave modulation
Generation Cable, DVB-C2) signal.
Due to the single DVB-C2 signal for the channel 8MHz (6MHz) grid (channel raster) spectrum criterion
Bandwidth can be 8~450MHz (6~338MHz), it is meant that may carry several be distributed in simultaneously on the same transmission line
The different frequency position and therefore different DVB-C2 signal of amount of bandwidth in known technical field, needs demodulator to exist
Signal receiving end is transmitted the frequency band search movement of signal.However, will simple and accurate detection go out carrier signal frequency band, still
It is the important topic of this field designer.
Summary of the invention
The present invention provides a kind of multi-carrier signal demodulation device and its multi-carrier signal frequency band detection method, can be accurate
Detect multi-carrier signal frequency band.
The present invention provides a kind of receiving system, and multi-carrier signal demodulates the multi-carrier signal frequency band of device application
Detection method can accurate detection go out multi-carrier signal frequency band.
In multi-carrier signal frequency band detection method of the invention, wherein each carrier signal, which has, respectively corresponds multiple times
Multiple symbols (symbol, also referred to as " symbol " or " symbol "), frequency band detection method include: the Whole frequency band according to carrier signal
Range is to define frequency sweep regional scope；In frequency sweep regional scope, according to time offset value and frequency offseting value to obtain
Each symbol of each carrier signal is corresponding to refer to symbol；These symbols according to each carrier signal refer to symbol with corresponding
Arithmetical operation is carried out with the corresponding control information of the carrier frequency for generating each carrier signal；Also, it is corresponding according to carrier signal
Control information adjusts the Whole frequency band range of carrier signal, wherein time offset value and frequency offseting value be according to carrier signal
In pilot signal position and set.
In one embodiment of this invention, the Whole frequency band range of above-mentioned foundation carrier signal is to define frequency sweep region model
The step of enclosing includes: some or all of to define in Whole frequency band range for frequency sweep regional scope.
In one embodiment of this invention, above-mentioned time offset value is equal in each carrier signal, and symbol is pilot signal
Adjacent two symbol time interval, frequency offseting value be equal to 0.
In one embodiment of this invention, above-mentioned frequency offseting value is the first load in carrier signal with pilot signal
The difference on the frequency of wave signal and the second carrier signal, time offset value are equal to the first symbol in first carrier signal for pilot signal
With the time interval for the second symbol in the second carrier signal being pilot signal.
In one embodiment of this invention, the above-mentioned symbol according to each carrier signal and it is corresponding with reference to symbol into
The step of row arithmetical operation corresponding with the carrier frequency for generating each carrier signal control information includes: for each carrier signal
Symbol and corresponding reference symbol carry out multiplying and generate multiple multiplication results respectively；Also, calculate multiplication
The summation of operation result corresponds to the control information of each carrier signal to obtain.
In one embodiment of this invention, the above-mentioned symbol according to each carrier signal and it is corresponding with reference to symbol into
The step of row arithmetical operation corresponding with the carrier frequency for generating each carrier signal control information includes: for each carrier signal
Symbol and corresponding reference symbol carry out multiplying and generate multiple multiplication results respectively；For multiplying knot
Fruit, which is normalized, to be calculated and generates multiple normalization multiplication results respectively；And calculate normalization multiplication result
Summation to obtain the control information of corresponding each carrier signal.
In one embodiment of this invention, the pilot signal in above-mentioned carrier signal is leading pilot signal, edge is led
At least one of frequency signal, continuous pilot signal and scatter pilot signal.
Multi-carrier signal demodulation device of the invention includes frequency-region signal converter, control information calculator and frequency band
Detector.Frequency-region signal converter receives the input signal of time domain and input signal is converted to the multi-carrier signal of frequency domain.School
Positive information calculator couples the frequency-region signal converter and receives multi-carrier signal, wherein control information calculator is to execute:
Whole frequency band range according to multi-carrier signal is to define frequency sweep regional scope；In frequency sweep regional scope, according to time migration
Value and frequency offseting value are corresponding with reference to symbol with the respectively symbol for obtaining each carrier signal；Symbol according to each carrier signal
Arithmetical operation is carried out with the corresponding control information of the carrier frequency for generating each carrier signal with reference to symbol with corresponding.Frequency band
Detector couples control information calculator, and the full range of multi-carrier signal is adjusted according to the corresponding control information of these carrier signals
Band range.Wherein, time offset value and frequency offseting value according to the pilot signal in multi-carrier signal position and set.
In addition, receiving system of the invention, including above-mentioned multi-carrier signal demodulation device, tuner and frequency
Tape controller.Tuner couples multi-carrier signal and demodulates device, and according to setting frequency band to be tuned for radiofrequency signal
Device is demodulated to generate and provide intermediate frequency or zero intermediate frequency signals to multi-carrier signal.Band controller couples tuner and overloading
Wave signal demodulates device, with foundation Whole frequency band range to generate setting frequency band.
Based on above-mentioned, the present invention provides multi-carrier signal demodulation device with inclined according to a time offset value and a frequency
Shifting value is scanned to be directed to each carrier signal, and reference symbol corresponding to the symbol by detecting each carrier signal is counted
Control information is calculated, and adjusts the Whole frequency band range of multi-carrier signal by control information.In this way, which the present invention passes through inspection
The time offset value and frequency offseting value between the position of the pilot signal in multi-carrier signal are looked into, can learn multi-carrier signal
Whole frequency band range, and effective corrective action can be carried out.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and it is detailed to cooperate attached drawing to make
Carefully it is described as follows.
Detailed description of the invention
Fig. 1 is painted the signal symbol of the second generation cable digital TV video broadcasting (DVB-C2) of one embodiment of the invention
Distribution schematic diagram.
Fig. 2 is painted the flow chart of the multi-carrier signal frequency band detection method of one embodiment of the invention.
Fig. 3 A~Fig. 3 D is painted showing for the first embodiment of the multi-carrier signal frequency band detection method of the embodiment of the present invention
It is intended to.
Fig. 4 A~Fig. 4 C is painted showing for the second embodiment of the multi-carrier signal frequency band detection method of the embodiment of the present invention
It is intended to.
Fig. 5 A~Fig. 5 C is painted showing for the third embodiment of the multi-carrier signal frequency band detection method of the embodiment of the present invention
It is intended to.
Fig. 6 is painted the schematic diagram of the receiving system of one embodiment of the invention.
[symbol description]
110,120: region
PP: leading pilot signal
SP, SP1, SP2: scatter pilot signal
CP, CP1, CP2: continuous pilot signal
EP, EP1, EP2: edge pilot signal
L1DAT: data symbol
S210~S240: frequency band detecting step
SR: frequency sweep regional scope
302,402,502:DVB-C2 signal
301,401,501: other signals
f0~f24: frequency
CI, CI1, CI2: calculated result
Z1~Z3: frequency range
CBR: Whole frequency band range
600: receiving system
610: tuner
620: band controller
630: multi-carrier signal demodulates device
RFIN: radiofrequency signal
631:ADC
632: digital signal processor
633: frequency-region signal converter
634: frequency band detector
635: control information calculator
6331:DFT
6332: processor
OUT: demodulation output signal
IN: input signal
Specific embodiment
Fig. 1 is please referred to, Fig. 1 is painted the second generation cable digital TV video broadcasting (DVB-C2) of one embodiment of the invention
The distribution schematic diagram of signal symbol.Horizontal axis in Fig. 1 indicates different frequencies, and the longitudinal axis then indicates the different time.In region 110
Expression is leading (preamble) symbol, and in region 120 it is represented then for data symbol (symbol, also referred to as
" symbol " or " symbol ").In addition, in leading symbol in region 110, including multiple leading pilot signal PP (in Fig. 1 with it is leading
It is all leading pilot signal that pilot signal PP, which has the pattern of identical net bottom), and then include in the data symbol in region 120
Multiple scatter pilot signal SP, continuous pilot signal CP and edge pilot signal EP (have in Fig. 1 with scatter pilot signal SP
The pattern of identical net bottom is all scatter pilot signal, and having the pattern of identical net bottom with continuous pilot signal CP is all CP continuous pilot
Signal, and having the pattern of identical net bottom with edge pilot signal EP is all edge pilot signal EP).In addition, hollow in Fig. 1
Circle all represents the data symbol L1DAT of non-pilot signal.
By being painted it can be found that in the signal of DVB-C2 format for Fig. 1, leading pilot signal PP, scatter pilot signal
SP, continuous pilot signal CP and edge pilot signal EP are dispersed in the time shaft and frequency axis of fixed relative position respectively
On.Also therefore, whether leading pilot signal PP, scatter pilot signal SP, continuous pilot signal CP and edge pilot signal
Which of EP can have fixed difference on the frequency and time interval between two pilot signals.Therefore, by detecting multicarrier
The difference on the frequency and time interval between two pilot signals in signal can be used as the foundation of DVB-C2 signal band detection.
Based on above-mentioned explanation, below referring to figure 2., Fig. 2 is painted the multi-carrier signal frequency band inspection of one embodiment of the invention
The flow chart of survey method.Wherein, in step S210, the Whole frequency band range according to multi-carrier signal is to define frequency sweep region model
It encloses, and in step S220, in the frequency sweep regional scope defined, according to preset time offset value and frequency shift (FS)
Value acts to obtain the frequency sweep of the reference symbol of corresponding each carrier signal.It is specifically bright, it is for frequency sweep area in step S220
Each symbol of each carrier signal is scanned in the range of domain, and is found out between scanned symbol with the above-mentioned preset time
The reference symbol of deviant and frequency offseting value.
It is worth noting that, the time offset value and frequency offseting value in step S220 are according in DVB-C2 signal
What difference on the frequency and time interval between two selected pilot signals were set.In simple terms, time offset value and frequency
Rate deviant is leading pilot signal (preamble pilot) PP, scatter pilot signal in foundation DVB-C2 signal
(scattered pilot) SP, continuous pilot signal (continual pilot) CP and edge pilot signal (edge
Pilot) time interval and difference on the frequency of one of EP pilot signal and wherein another pilot signal come respectively into
Row setting.It is schematically shown as example with Fig. 1, if two of respective frequencies 0 continuous leading pilot signal PP are in selection region 110
Example, time offset value and frequency offseting value can be respectively set as 1 and 0.In addition, if selecting respective frequencies 12 in Fig. 1
Bottom scatter pilot signal SP and its lower right respective frequencies 24 scatter pilot signal SP be example, time migration
Value and frequency offseting value can then be respectively set as 1 and 12.
Then, in step S230, then the difference that is obtained in the symbol and scanning according to each carrier signal in step S220
The reference symbol of corresponding each symbol carries out arithmetical operation, and uses the corresponding correction letter of carrier frequency for generating each carrier signal
Breath.Carefully illustrate, is not the symbol of pilot signal with reference at least one in symbol when scanned symbol is corresponding
When code, it can be obtained using the corresponding arithmetical operation (for example, multiplying) carried out with reference to symbol of scanned symbol
Obtain the first result.And it is opposite, if when scanned symbol it is corresponding with reference to being all the symbol of pilot signal in symbol when,
Can be obtained using the corresponding arithmetical operation (for example, multiplying) carried out with reference to symbol of scanned symbol
Two results.Wherein, the correlation between the symbol based on pilot signal is higher, and the first result will obviously be less than the second result.Therefore,
By searching for the difference among multiple results obtained in arithmetical operation performed in step S230 out, so that it may find out
The position of symbol comprising the correct pilot signal in DVB-C2 signal in frequency sweep regional scope.
In embodiments of the present invention, the scanned symbol that can add up for each frequency is corresponding with reference to symbol
The multiplication result of conjugate complex number obtains control information.And by the corresponding multiple control informations of multiple frequencies, to find out
Which have in configuration frequency sweep movement in frequency, the symbol of the pilot signal selected.Specifically, for the correction of each frequency k
Information Cor [k] can be calculated such as the mode of mathematics (1):
Wherein, l is the time, and Y is to receive the corresponding frequency domain symbol of signal, and Dx is frequency offseting value, and Dy is then time migration
Value.
On the other hand, control information Cor [k] can be added normalized mode and be calculated, and use promotion correction letter
The reliability of breath.With this condition, control information Cor [k] can be calculated such as the mode of mathematics (2):
Finally, the Whole frequency band range of adjustment carrier signal is then used according to above-mentioned control information in step S240.Letter
For list, the embodiment of the present invention can be according to the frequency to the arithmetical operation calculated result for being higher than default size corresponding in control information
Rate cooperates preset time and frequency offseting value to know the information of the frequency band of DVB-C2 signal, and adjusts carrier signal whereby
Whole frequency band range.
Subsidiary one mentions, and the frequency sweep movement of above-mentioned steps S230 can be performed at any time, therefore, step S240 can be moved
The most newly generated control information of foundation of state acts to carry out the adjustment of the Whole frequency band range of carrier signal.
It will be presented below several actual implementation examples, to illustrate the multi-carrier signal frequency band detection side of the embodiment of the present invention
The implementation detail of method.
A~Fig. 3 D referring to figure 3., Fig. 3 A~Fig. 3 D are painted the multi-carrier signal frequency band detection method of the embodiment of the present invention
The schematic diagram of first embodiment.In figure 3 a, by selecting the symbol of edge pilot signal EP1 and EP2 come setpoint frequency
Deviant and time offset value, wherein the frequency offseting value Dx of the symbol of edge pilot signal EP1 and EP2 be equal to 0, and
Its time offset value Dy is equal to 1.
Then, in figure 3b, in the frequency sweep regional scope SR defined, according to preset time offset value (Dy
1) and frequency offseting value (Dx be equal to 0) obtains the frequency sweep movement of the reference symbol of corresponding each carrier signal equal to, wherein sweep
Frequency domain range SR includes the frequency range of the DVB-C2 signal 302 of part, and includes other most signals 301
Frequency range.
Subsidiary one mentions, and in DVB-C2 signal 302, edge pilot signal EP is distributed in frequency f12And f23, continuously lead
Frequency signal CP is distributed in frequency f14、f17、f19And f22On.
By above-mentioned scanning motion, corresponding each frequency f can be obtained0~f13Calculated result control information.Wherein,
Since edge pilot signal EP1 and EP2 are distributed in frequency f12Symbol in, therefore, respective frequencies f12Calculated result CI
Numerical value is larger, also therefore can be determined that the frequency band left margin of DVB-C2 signal 302 should occur in frequency f12On.
By above-mentioned information, the frequency band left margin of DVB-C2 signal 302 can be identified, and it is correct to use acquisition
The Whole frequency band range CBR of DVB-C2 signal 302.
D in embodiments of the present invention, can when being scanned movement for frequency sweep regional scope SR referring to figure 3. herein
The movement being all scanned for all frequencies in frequency sweep regional scope SR is not needed.In fig. 3d, frequency sweep area can be directed to
The frequency range Z3 of frequency range Z1 and the DVB-C2 signal 302 of other signals 301 in the range SR of domain with data symbol
It is scanned movement, and can then not need to execute scanning motion without the frequency range Z2 for carrying any signal.In this way, this hair
The frequency sweep movement of bright embodiment more efficiently and can save operand.
A~Fig. 4 C, Fig. 4 A~Fig. 4 C are painted the multi-carrier signal frequency band detection side of the embodiment of the present invention referring to figure 4. below
The schematic diagram of the second embodiment of method.In Figure 4 A, it is set by selecting the symbol of edge pilot signal EP1 and EP2
Frequency offseting value and time offset value, alternatively, frequency can be set by selecting the symbol of continuous pilot signal CP1 and CP2
Rate deviant and time offset value, more alternatively, can also be set by selecting the symbol of scatter pilot signal SP1 and SP2
Determine frequency offseting value and time offset value.Wherein, frequency offseting value Dx is equal to 0, and its time offset value Dy is equal to 4.
Then, in figure 4b, in the frequency sweep regional scope SR defined, according to preset time offset value (Dy
4) and frequency offseting value (Dx be equal to 0) obtains the frequency sweep movement of the reference symbol of corresponding each carrier signal equal to, wherein sweep
Frequency domain range SR includes the frequency range of the DVB-C2 signal 402 of part, and includes other most signals 401
Frequency range.
Subsidiary one mentions, and in DVB-C2 signal 402, edge pilot signal EP is distributed in frequency f10And f22On；It spreads
Pilot signal SP is distributed in frequency f12、f14、f16、f18And f20On；Continuous pilot signal CP is distributed in frequency f13、f17And
f21On.
By above-mentioned scanning motion, corresponding each frequency f can be obtained0~f14Calculated result control information.Wherein,
Since edge pilot signal EP1 and EP2 are distributed in frequency f10Symbol in, scatter pilot signal SP1 and SP2 are distributed in frequency
f12Symbol in, and continuous pilot signal CP1 and CP2 are distributed in frequency f13Symbol in, therefore, respectively correspond frequency f10、
f12And f13Calculated result CI1, CI2 and CI3 numerical value it is larger, also therefore can be determined that the full range of DVB-C2 signal 402
Band range.
By above-mentioned information, the frequency band left margin of DVB-C2 signal 402 can be identified, and it is correct to use acquisition
The Whole frequency band range CBR of DVB-C2 signal 402.
A~Fig. 5 C, Fig. 5 A~Fig. 5 C are painted the multi-carrier signal frequency band detection of the embodiment of the present invention more referring to figure 5. below
The schematic diagram of the third embodiment of method.In fig. 5, pass through selected edge pilot signal EP1 and scatter pilot signal
The symbol of SP1 comes setpoint frequency deviant and time offset value, alternatively, can also by selected scatter pilot signal SP1 and
The symbol of SP2 comes setpoint frequency deviant and time offset value.Wherein, frequency offseting value Dx is equal to 12, and its time migration
Value Dy is equal to 1.
Then, in figure 5B, in the frequency sweep regional scope SR defined, according to preset time offset value (Dy
12) and frequency offseting value (Dx be equal to 1) obtains the frequency sweep movement of the reference symbol of corresponding each carrier signal equal to, wherein
Frequency sweep regional scope SR includes the frequency range of the DVB-C2 signal 502 of part, and includes other most signals 501
Frequency range.
Subsidiary one mentions, and in DVB-C2 signal 502, edge pilot signal EP is distributed in frequency f10And f22On；It spreads
Pilot signal SP is distributed in frequency f12、f14、f16、f18And f20On；Continuous pilot signal CP is distributed in frequency f13、f17And
f21On.
By above-mentioned scanning motion, corresponding each frequency f can be obtained0~f14Calculated result control information.Wherein,
Since edge pilot signal EP1 and scatter pilot signal SP1 are respectively distributed to frequency f10And f12Symbol in, and spread
Pilot signal SP1 and scatter pilot signal SP2 are respectively distributed to frequency f12And f14Symbol in, therefore, respectively correspond frequency
Rate f10And f12Calculated result CI1, CI2 numerical value it is larger, also therefore can be determined that the Whole frequency band model of DVB-C2 signal 502
It encloses.
By above-mentioned information, the frequency band left margin of DVB-C2 signal 502 can be identified, and it is correct to use acquisition
The Whole frequency band range CBR of DVB-C2 signal 502.
Fig. 6 is please referred to below, and Fig. 6 is painted the schematic diagram of the receiving system of one embodiment of the invention.Signal receives system
System 600 includes that tuner 610, band controller 620 and multi-carrier signal demodulate device 630.Tuner 610 couples overloading
Wave signal demodulates device 630, according to setting frequency band to be tuned for radiofrequency signal RFIN to generate intermediate frequency or zero intermediate frequency
Tuning signal and provide tuning signal to multi-carrier signal demodulate device 630.Band controller 620 then couples tuner
610 and multi-carrier signal demodulate device 630, with according to multi-carrier signal demodulation device 630 provided by Whole frequency band range
CBR is to generate setting frequency band.
It includes analog-digital converter (Analog to Digital that multi-carrier signal, which demodulates device 630,
Converter, ADC) 631, digital signal processor 632, frequency-region signal converter 633, frequency band detector 634 and correction letter
Cease calculator 635.ADC 631 receives the tuning signal of intermediate frequency or zero intermediate frequency, and converts tuning signal as a period of time of number format
Domain input signal.Digital signal processor 632 couples ADC 631, and executes Digital Signal Processing for time domain input signal and move
Make, and provides treated digital signal to frequency-region signal converter 633.
Frequency-region signal converter 633 include Fourier signal converter (Discrete Fourier Transformer,
DFT) 6331 and processor 6332.Fourier signal converter 6331 receives time domain input signal IN and converts time domain input letter
Number IN is to generate the multi-carrier signal of frequency domain.Processor 6332 carries out frequency domain processing (such as channel-equalization for multi-carrier signal
Processing) and generate demodulation output signal OUT.
Frequency-region signal converter 633 receives time domain input signal IN and time domain input signal IN is converted to the multiple of frequency domain
Carrier signal.Control information calculator 635 couples frequency-region signal converter 633, and receives frequency-region signal converter 633 and provided
Carrier signal.Wherein, control information calculator 635 is to execute the Whole frequency band range of (1) foundation carrier signal to define
Frequency sweep regional scope；(2) in frequency sweep regional scope, according to time offset value and frequency offseting value to obtain each carrier signal
Each symbol it is corresponding refer to symbol；(3) arithmetic fortune is carried out according to the symbol of each carrier signal and corresponding reference symbol
It calculates and is acted with the corresponding control information of carrier frequency etc. for generating each carrier signal.
The correlative detail of the movement performed by above-mentioned control information calculator 635, in embodiment above-mentioned and implementation
Has explanation in detail in method, below without repeating more.
Frequency band detector 634 then couples control information calculator 635, and adjusts according to the corresponding control information of carrier signal
The Whole frequency band range CBR of whole multi-carrier signal.
In conclusion the present invention utilizes the time offset value and frequency offseting value between the pilot signal in multi-carrier signal
The scanning of carrier wave is carried out, and finds out the correct frequency in multi-carrier signal where pilot signal whereby.Also, by leading
Frequency where frequency signal uses the adjustment movement for carrying out frequency band to know the Whole frequency band range of multi-carrier signal.Such one
Coming, multi-carrier signal frequency band dynamic and can be accurately detected, and the demodulation of signal is acted and can be more accurately performed,
Ensure the quality of signal.
Claims (19)
1. a kind of multi-carrier signal frequency band detection method, wherein respectively the carrier signal has the multiple symbols for respectively corresponding multiple times
Code, comprising:
According to the Whole frequency band range of these carrier signals to define frequency sweep regional scope；
In the frequency sweep regional scope, respectively symbol of the respectively carrier signal is obtained according to time offset value and frequency offseting value
Code is corresponding to refer to symbol；
Arithmetical operation is carried out according to respectively these symbols of the carrier signal and corresponding reference symbol to generate the respectively carrier wave
The corresponding control information of the carrier frequency of signal comprising for these symbols and corresponding reference of the respectively carrier signal
Symbol carries out multiplying and generates multiple multiplication results respectively, and calculates the summation of these multiplication results to obtain
The control information of the respectively carrier signal must be corresponded to；And
The Whole frequency band range of these carrier signals is adjusted according to the corresponding control information of these carrier signals,
Wherein, the time offset value and the frequency offseting value according to the pilot signal in these carrier signals position and set
It is fixed,
Wherein, each control information Cor [k] of the carrier frequency k of the carrier signal are as follows:
Wherein, l is the time, and Y is to receive the corresponding frequency domain symbol of signal, and Dx is that frequency is inclined
Shifting value, Dy are then time offset value.
2. multi-carrier signal frequency band detection method as described in claim 1, wherein the Whole frequency band according to these carrier signals
Range includes: the step of the frequency sweep regional scope to define
It some or all of defines in the Whole frequency band range as the frequency sweep regional scope.
3. multi-carrier signal frequency band detection method as described in claim 1, wherein the time offset value is believed equal to the respectively carrier wave
In number, these symbols are the time interval of adjacent two symbol of pilot signal, which is equal to 0.
4. multi-carrier signal frequency band detection method as described in claim 1, wherein the frequency offseting value is these carrier signals
In the first carrier signal with pilot signal and the second carrier signal difference on the frequency, the time offset value is equal to the first carrier
Be in signal pilot signal the first symbol and second carrier signal in be pilot signal the second symbol time interval.
5. multi-carrier signal frequency band detection method as described in claim 1, wherein the pilot signal in these carrier signals is
At least one of leading pilot signal, edge pilot signal, continuous pilot signal and scatter pilot signal.
6. a kind of multi-carrier signal frequency band detection method, wherein respectively the carrier signal has the multiple symbols for respectively corresponding multiple times
Code, comprising:
According to the Whole frequency band range of these carrier signals to define frequency sweep regional scope；
In the frequency sweep regional scope, respectively symbol of the respectively carrier signal is obtained according to time offset value and frequency offseting value
Code is corresponding to refer to symbol；
Arithmetical operation is carried out according to respectively these symbols of the carrier signal and corresponding reference symbol to generate the respectively carrier wave
The corresponding control information of the carrier frequency of signal comprising for these symbols and corresponding reference of the respectively carrier signal
Symbol carries out multiplying and generates multiple multiplication results respectively, and calculating is normalized for these multiplication results
And multiple normalization multiplication results are generated respectively, and calculate the summation of these normalization multiplication results to obtain pair
Should each carrier signal the control information；And
The Whole frequency band range of these carrier signals is adjusted according to the corresponding control information of these carrier signals,
Wherein, the time offset value and the frequency offseting value according to the pilot signal in these carrier signals position and set
It is fixed,
Wherein, each control information Cor [k] of the carrier frequency k of the carrier signal are as follows:
Wherein, l is the time, and Y is to receive the corresponding frequency domain symbol of signal, and Dx is frequency shift (FS)
Value, Dy is then time offset value.
7. multi-carrier signal frequency band detection method as claimed in claim 6, wherein the pilot signal in these carrier signals is
At least one of leading pilot signal, edge pilot signal, continuous pilot signal and scatter pilot signal.
8. a kind of multi-carrier signal demodulates device, comprising:
Frequency-region signal converter receives input signal and the input signal is converted to multiple carrier signals of frequency domain, wherein respectively
The carrier signal has the multiple symbols for respectively corresponding multiple times；
Control information calculator couples the frequency-region signal converter, receives these carrier signals, wherein the control information calculator
To execute:
According to the Whole frequency band range of these carrier signals to define frequency sweep regional scope；
In the frequency sweep regional scope, respectively symbol of the respectively carrier signal is obtained according to time offset value and frequency offseting value
Code is corresponding to refer to symbol；
Arithmetical operation is carried out according to respectively these symbols of the carrier signal and corresponding reference symbol to generate the respectively carrier wave
The corresponding control information of the carrier frequency of signal, wherein the control information calculator for each these symbols of the carrier signal with
It is corresponding to carry out multiplying with reference to symbol and generate multiple multiplication results respectively, and calculate these multiplying knots
The summation of fruit is to obtain corresponding respectively carrier signal control information；And
Frequency band detector couples the control information calculator, adjusts these according to the corresponding control information of these carrier signals
The Whole frequency band range of carrier signal,
Wherein, the time offset value and the frequency offseting value according to the pilot signal in these carrier signals position and set
It is fixed,
Wherein, each control information Cor [k] of the carrier frequency k of the carrier signal are as follows:
Wherein, l is the time, and Y is to receive the corresponding frequency domain symbol of signal, and Dx is frequency shift (FS)
Value, Dy is then time offset value.
9. multi-carrier signal as claimed in claim 8 demodulates device, wherein the control information calculator also defines the full range
It is the frequency sweep regional scope some or all of in band range.
10. multi-carrier signal as claimed in claim 8 demodulates device, wherein the time offset value is equal to the respectively carrier signal
In, these symbols are the time interval of adjacent two symbol of pilot signal, which is equal to 0.
11. multi-carrier signal as claimed in claim 8 demodulates device, wherein the frequency offseting value is in these carrier signals
The difference on the frequency of first carrier signal and the second carrier signal with pilot signal, the time offset value are believed equal to the first carrier
Be in number pilot signal the first symbol and second carrier signal in be pilot signal the second symbol time interval.
12. multi-carrier signal as claimed in claim 8 demodulates device, before wherein the pilot signal in these carrier signals is
Lead at least one of pilot signal, edge pilot signal, continuous pilot signal and scatter pilot signal.
13. multi-carrier signal as claimed in claim 8 demodulates device, wherein further include:
Analog and digital signal converter receives tuned radio frequency signal, and the tuned radio frequency signal of converting analogue signals is number
The input signal of format；And
Digital signal processor couples the analog and digital signal converter, and executes Digital Signal Processing for the input signal
Movement, and treated the digital signal is provided to the frequency-region signal converter.
14. multi-carrier signal as claimed in claim 8 demodulates device, wherein the frequency-region signal converter includes:
Fourier signal converter receives the input signal and converts the input signal to generate these carrier signals；And
Processor is handled for these carrier signals and generates demodulation output signal.
15. a kind of multi-carrier signal demodulates device, comprising:
Frequency-region signal converter receives input signal and the input signal is converted to multiple carrier signals of frequency domain, wherein respectively
The carrier signal has the multiple symbols for respectively corresponding multiple times；
Control information calculator couples the frequency-region signal converter, receives these carrier signals, wherein the control information calculator
To execute:
According to the Whole frequency band range of these carrier signals to define frequency sweep regional scope；
In the frequency sweep regional scope, respectively symbol of the respectively carrier signal is obtained according to time offset value and frequency offseting value
Code is corresponding to refer to symbol；
Arithmetical operation is carried out according to respectively these symbols of the carrier signal and corresponding reference symbol to generate the respectively carrier wave
The corresponding control information of the carrier frequency of signal, wherein the control information calculator for each these symbols of the carrier signal with
It is corresponding to carry out multiplying with reference to symbol and generate multiple multiplication results respectively, and it is directed to these multiplying knots
Fruit, which is normalized, to be calculated and generates multiple normalization multiplication results respectively, and calculates these normalization multiplying knots
The summation of fruit is to obtain corresponding respectively carrier signal control information；
Frequency band detector couples the control information calculator, adjusts these according to the corresponding control information of these carrier signals
The Whole frequency band range of carrier signal,
Wherein, the time offset value and the frequency offseting value according to the pilot signal in these carrier signals position and set
It is fixed,
Wherein, each control information Cor [k] of the carrier frequency k of the carrier signal are as follows:
Wherein, l is the time, and Y is to receive the corresponding frequency domain symbol of signal, and Dx is frequency shift (FS)
Value, Dy is then time offset value.
16. multi-carrier signal as claimed in claim 15 demodulates device, wherein the pilot signal in these carrier signals is
At least one of leading pilot signal, edge pilot signal, continuous pilot signal and scatter pilot signal.
17. multi-carrier signal as claimed in claim 15 demodulates device, wherein further include:
Analog and digital signal converter receives tuned radio frequency signal, and the tuned radio frequency signal of converting analogue signals is number
The input signal of format；And
Digital signal processor couples the analog and digital signal converter, and executes Digital Signal Processing for the input signal
Movement, and treated the digital signal is provided to the frequency-region signal converter.
18. multi-carrier signal as claimed in claim 15 demodulates device, wherein the frequency-region signal converter includes:
Fourier signal converter receives the input signal and converts the input signal to generate these carrier signals；And
Processor is handled for these carrier signals and generates demodulation output signal.
19. a kind of receiving system, comprising:
Multi-carrier signal as claimed in claim 8 demodulates device；
Tuner couples multi-carrier signal demodulation device, according to setting frequency band to be tuned for radiofrequency signal to produce
It gives birth to and the tuned radio frequency signal to the multi-carrier signal is provided and demodulate device；And
Band controller couples the tuner and multi-carrier signal demodulation device, according to the Whole frequency band range to generate this
Set frequency band.
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| CN1465150A (en) * | 2001-06-29 | 2003-12-31 | 松下电器产业株式会社 | Multicarrier transmitter, multicarrier receiver, and multicarrier wireless communication method |
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| US6442222B1 (en) * | 1998-12-24 | 2002-08-27 | At&T Wireless Services, Inc. | Method for error compensation in an OFDM system with diversity |
| CN1413391A (en) * | 1999-12-22 | 2003-04-23 | 高通股份有限公司 | Method and apparatus for performing search acquisition in multi-carrier communication system |
| CN1465150A (en) * | 2001-06-29 | 2003-12-31 | 松下电器产业株式会社 | Multicarrier transmitter, multicarrier receiver, and multicarrier wireless communication method |
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