CN100579097C - Frequency shift estimating device and method for multicarrier receiver - Google Patents
Frequency shift estimating device and method for multicarrier receiver Download PDFInfo
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- CN100579097C CN100579097C CN200410045250A CN200410045250A CN100579097C CN 100579097 C CN100579097 C CN 100579097C CN 200410045250 A CN200410045250 A CN 200410045250A CN 200410045250 A CN200410045250 A CN 200410045250A CN 100579097 C CN100579097 C CN 100579097C
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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
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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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
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
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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
- H04L27/2655—Synchronisation arrangements
- H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
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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
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
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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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
Abstract
The invention relates to a frequency offset estimation device for a multi-carrier receiver and a method. The frequency offset estimation device for a multi-carrier receiver comprises a high-speed Fourier modulation unit, which is used for modulating a transmission signal into a frequency domain signal; and a transmission information signal error detection unit, which is used in comparing the transmission information and the frequency domain signal, and determining the motion scope of the transmission information signal. Thereby, the frequency offset estimation device can effectively correct the frequency offset in a wide spacing.
Description
Technical field
The present invention relates to a kind of Frequency offset estimation apparatus and method that are used for multi-carrier receiver, and be particularly related to a kind of being used for by using the Frequency offset estimation apparatus and method of transmission parameter signaling (TPS) calculated rate skew, this transmission parameter signaling transmit transmitter transmission system such as the parameter relevant with modulation scheme with the channel coding schemes that adds time-domain synchronization OFDM (TDS-OFDM).
Background technology
Fig. 1 is the diagrammatic sketch of frame structure that is used for being presented at the TDS-OFDM of frequency domain.Use the TPS relevant to be used to transmit parameter such as chnnel coding and modulation scheme about the transmission system of transmitter with each set of symbols.In per 1248 set of symbols, use nine TPS carrier waves, and the TPS carrier wave relevant with the same code tuple carries identical information bit.
In general, be the principal element that reduces the reception of the signal of communication system because of the frequency shift (FS) that sends at signal and the frequency mismatch of the Doppler frequency shift that reception period causes by oscillator with by channel produces.Therefore, all communication systems need the Frequency Synchronization process, and synchronizing capacity influences the over-all properties of receiver significantly.
Fig. 2 A is used to show the block diagram that uses protection legacy frequencies skew estimation unit at interval.Frequency offset estimation device among Fig. 2 A has delay cell 10 and Phase Tracking unit 20.This delay cell 10 receives multi-carrier signals, and with multi-carrier signal postpone corresponding to the interval of a code element that in multi-carrier signal, comprises transmit.Phase Tracking unit 20 receives the multicarrier of transmission and the multicarrier after the delay, and by certain process estimated frequency skew.Fig. 2 B is the diagrammatic sketch that is used to show the multi-carrier signal frame.With reference to figure 2B, the multi-carrier signal frame is by synchronizing signal (PN), and protection is (GI) and data symbols composition at interval.This protection has and the identical signal of signal in certain interval of the end portion of data bit interval at interval.Delay in delay cell 10 is to be used for comparison at the protection interval of position a and the signal of position b.Channel estimating unit is relatively in the phase place of position a with in the phase place of position b, and calculates OFDM averaged frequency offset at interval.
Yet; because not according to each code element calculated rate skew; therefore it is inaccurate using protection frequency offset computations method at interval; and only in computable frequency shift (FS) at interval because the person's character of phase place places under the situation within 2 π effective; so computable maximum frequency deviation is half of frequency interval between the subcarrier, this by thereon can the calculated rate skew this be narrow and have problems at interval.In order to address this problem, the computational methods of synchronous frequency shift (FS) have been proposed to use.
Fig. 3 A is the block diagram that is used to show the Frequency offset estimation device that uses synchronizing signal.Frequency offset estimation device in Fig. 3 A has correlation unit 110, peak detection unit 120, delay cell 130 and Phase Tracking unit 140.Correlation unit 110 receives multi-carrier signal and reference sync signals, and this reference sync signal is identical with synchronizing signal prior to the multi-carrier signal of the transmission of multi-carrier signal, and calculates the correlation between the two.Peak detection unit 120 receives this correlation, and the detection peak position.The synchronizing signal that delay cell 130 coupling comprises in multi-carrier signal and from peak detection unit 120 detected peaks.Phase Tracking unit 140 is reference sync signals and from the synchronizing signal of the signal of delay cell 130 transmission relatively, and obtain phase difference.This method advantage is: owing to compare each synchronizing signal code element and can calculate frequency shift (FS) on wide interval, therefore can obtain accurate relatively frequency shift (FS).
Yet, in the frequency offset computations process of the use synchronizing signal in multi-path environment that in Fig. 3 B, shows, when relatively the PN of c and f comes the estimated frequency skew, the process of the synchronizing signal PN of d or e influence comparison c and the PN of f, this is created in the problem of the deterioration frequency shift (FS) judgement characteristic in the multi-path environment.
In order to solve this problem of prior art, used the method that each multipath channel calculated rate is offset and obtains then the final frequency skew.Yet this method has complicated system and realizes and expensive problem.
Summary of the invention
In order to solve above shortcoming and the other problems relevant, the present invention has been proposed with conventional apparatus.The object of the present invention is to provide a kind of Frequency offset estimation apparatus and method that are used for multi-carrier receiver, it is used for transmission parameter signaling (TPS) about the transmission of the parameter of the transmission system of transmitter by use, can use a spot of calculating correcting frequency shift on wide interval effectively.
Realize aforesaid basically and other purpose and advantage by the Frequency offset estimation device that is provided for multi-carrier receiver, this device comprises: high speed Fourier modulating unit is used for transmissions signal modulated and becomes frequency-region signal; With transmit information signals error detection unit, be used for comparison transmit information signals and frequency-region signal, and judge the scope that move the position of transmit information signals.Best, this transmission signals is time-domain synchronization OFDM (TDS-OFDM) signal, and this transmit information signals is the transmission parameter signaling (TPS) that comprises in the TDS-OFDM signal.
According to another embodiment of the invention, the Frequency offset estimation device that is used for multi-carrier receiver comprises: high speed Fourier modulating unit is used for transmission signal modulation becoming frequency-region signal; The transmit information signals position detection unit is used for detecting the position of the minimum value with the difference power between current code element relevant with frequency-region signal and previous code element; With transmit information signals error detection unit, be used for the position of more detected position and transmit information signals, and judge the scope that move the position of transmit information signals.This transmit information signals position detection unit comprises: delay cell is used to receive the frequency-region signal by after the modulation of high speed Fourier modulating unit, and postpones the length of a code element of this signal; First power estimation unit is used for the power of the signal behind the estimated delay; Second power estimation unit is used to estimate from the power of the signal of high speed Fourier modulating unit transmission; Subtrator is used to calculate from the power of first power estimation unit transmission and poor between the power of second power cell transmission; Mobile adder unit at interval, be used to calculate by subtrator calculate about some value at interval and; With the minimum value position detection unit, be used for detecting the interval of one of minimum with the value that calculates by mobile adder unit at interval.
Best, the transmit information signals position detection unit comprises: delay cell is used to receive the frequency-region signal by after the modulation of high speed Fourier modulating unit, and postpones the length of a code element of this signal; First power estimation unit is used for the power of the signal behind the estimated delay; Second power estimation unit is used to estimate from the power of the signal of high speed Fourier modulating unit transmission; Subtrator is used to calculate from the power of first power estimation unit transmission and poor between the power of second power estimation unit transmission; Adder unit, be used to calculate from the power of first power estimation unit transmission and from the power of second power estimation unit transmission and; Divider, value that is calculated by subtrator and the value that is calculated by adder unit are used to be divided by; Mobile adder unit at interval, be used to calculate by divider calculate about some value at interval and; With the minimum value position detection unit, be used for detecting the interval of one of minimum with the value that calculates by mobile adder unit at interval.
Best, transmission signals is the TDS-OFDM signal, and transmit information signals is the TPS signal that comprises in the TDS-OFDM signal.
The frequency offset estimation methods that is used for multi-carrier receiver comprises: high speed Fourier modulation step is used for transmission signals modulation becoming frequency-region signal; With transmit information signals error detection step, be used for comparison transmit information signals and frequency-region signal, and judge the scope that move the position of transmit information signals.
Best, transmission signals is the TDS-OFDM signal, and transmit information signals is the TPS signal that comprises in the TDS-OFDM signal.
According to another embodiment of the invention, the frequency offset estimation methods that is used for multi-carrier receiver comprises: high speed Fourier modulation step is used for transmission signals modulation becoming frequency-region signal; Transmit information signals position probing step is used for detecting the position of the minimum value with relevant with frequency-region signal difference power between current code element and previous code element; With transmit information signals error detection step, be used for the position of more detected position and transmit information signals, and judge the scope that move the position of transmit information signals.
Transmit information signals position probing step comprises: postpone step, be used to receive the frequency-region signal that is modulated by high speed Fourier modulation step, and postpone the length of a code element of this signal; First power estimation step is used for the power of estimated delay signal; Second power estimation step is used for estimating the power of the signal that transmits from high speed Fourier modulation step; Subtraction process is used for calculating poor between power that transmits from first power estimation step and the power that transmits from second power estimation step; Mobile addition step at interval, be used to calculate by subtraction process calculate about some value at interval and; With minimum value position probing step, be used for detecting have calculate and the interval of one of minimum.
Best, transmit information signals position probing step comprises: postpone step, be used to receive the frequency-region signal that is modulated by high speed Fourier modulation step, and postpone the length of a code element of this signal; First power estimation step is used for the power of estimated delay signal; Second power estimation step is used for estimating the power of the signal that transmits from high speed Fourier modulation step; Subtraction process is used for calculating poor between power that transmits from first power estimation step and the power that transmits from second power estimation step; The addition step, be used to calculate from the power of first power estimation unit transmission and from the power of second power estimation unit transmission and; Be used for the difference that will calculate divided by calculate and, and calculate and the step of the ratio of difference; Be used to calculate about some rate value that has calculated at interval and step; With minimum value position probing step, be used to detect have by certain at interval minimum and the interval.
Best, the signal of transmission is the TDS-OFDM signal, and transmit information signals is the TPS signal that comprises in the TDS-OFDM signal.
Description of drawings
By describing some embodiment of the present invention with reference to the accompanying drawings, above-mentioned purpose of the present invention and characteristics will become apparent, wherein:
Fig. 1 is the diagrammatic sketch that is used for being presented at the TDS-OFDM frame structure of frequency domain;
Fig. 2 A is used to show the block diagram that uses protection legacy frequencies skew estimation unit at interval;
Fig. 2 B is the diagrammatic sketch at the TDS-OFDM of time domain frame structure that is used for showing according to Fig. 2 A;
Fig. 3 A is the block diagram that is used to show the Frequency offset estimation device that uses synchronizing signal;
Fig. 3 B is the diagrammatic sketch at the TDS-OFDM of time domain frame structure under multi-path environment that is used for showing according to Fig. 3 A;
Fig. 4 is the block diagram that is used to show according to the Frequency offset estimation device that is used for multi-carrier receiver of first embodiment of the invention;
Fig. 5 is the block diagram that is used to show according to the Frequency offset estimation device that is used for multi-carrier receiver of second embodiment of the invention;
Fig. 6 is the block diagram that is used to show according to the Frequency offset estimation device that is used for multi-carrier receiver of third embodiment of the invention;
Fig. 7 is the flow chart that is used for being presented at the method for operation of the Frequency offset estimation device that is used for multi-carrier receiver that Fig. 4 shows;
Fig. 8 is the flow chart that is used for being presented at the method for operation of the Frequency offset estimation device that is used for multi-carrier receiver that Fig. 5 shows; With
Fig. 9 is the flow chart that is used for being presented at the method for operation of the Frequency offset estimation device that is used for multi-carrier receiver that Fig. 6 shows;
Embodiment
Below, describe the present invention in detail with reference to accompanying drawing.
Fig. 4 is the block diagram that is used to show according to the Frequency offset estimation device of first embodiment of the invention.This Frequency offset estimation device has high speed Fourier modulating unit 200 and TPS positional fault detecting unit 250.If the size of TPS signal and position all are known, then can use the Frequency offset estimation device in Fig. 4, and High Speed Modulation unit 200 receives and modulation signal to frequency domain.TPS positional fault detecting unit 250 comparison TPS signals and modulated arrive the signal of frequency domain, and modulate based on this and detect the TPS position, and the estimated frequency skew.This TPS signal comprises its position and value, so learn the scope of the variation of the TPS signal that comprises frequency shift (FS) easily.
Fig. 5 is the block diagram that is used to show according to the Frequency offset estimation device of second embodiment of the invention.Fig. 5 has shown that the positional information that is adapted at about the TPS signal is known, and size is the Frequency offset estimation device under the condition of unknown, and it has high speed Fourier modulating unit 300, TPS position detection unit 320 and TPS positional fault detecting unit 350.This high speed Fourier modulating unit 300 receives and the modulation time-domain signal becomes frequency-region signal.This TPS position detection unit 320 receives frequency-region signal and detects the TPS position.In detail, this TPS position detection unit 320 has first power estimation unit 321, delay cell 322, the second power estimation unit 323, subtrator 324, mobile adder unit 328 and minimum value position detection unit 329 at interval.First power estimation unit 321 is calculated the power of the signal after the modulation of high speed Fourier.Usually, TPS uses the strong planisphere as BPSK or QPSK of anti-error performance, and for bandwidth efficiency, user data uses the planisphere as 16QAM or 64QAM of high bit rate, so the power of 16QAM or 64QAM relies on signal constellation which and changes, but the power of TPS is consistent.Delay cell 322 postpones the output of the symbol time of signal after the modulation of high speed Fourier.The power of the signal behind second power estimation unit, 323 estimated delays.Subtrator 324 calculates the poor of two signals.At interval mobile adder unit 328 connects the compartment of terrain at interval in order to improve precision and moves, and the counting period and.Minimum value position detection unit 329 detects the interval with minimum value according to the result of the mobile adder unit 328 in interval, and estimates that detected interval is as the TPS position.The TPS position that TPS positional fault detecting unit 350 is more known and by minimum value position detection unit 329 detected TPS positions, and estimated frequency skew.
Fig. 6 is the block diagram that is used to show according to the Frequency offset estimation device of third embodiment of the invention.Except the TPS position detection unit 420 that shows in Fig. 6 also comprises adder unit 425 and divider 426, the structure of the Frequency offset estimation device in Fig. 6 structure with the Frequency offset estimation device that shows in Fig. 5 basically is identical, and this is in order to prevent from first power estimation unit 421 with have the mistake the general data under the situation of little value from all signals of second power estimation unit 423 transmission.Adder unit 425 receives the signal from first and second power estimation unit 421 and 423, and calculate the signal that receives and.Divider 426 will be from the signal of subtrator 424 output divided by the signal from adder unit 425 outputs.Usually, consider that comparing the TPS signal with the general data signal has characteristic consistent and big power, the value that calculates based on TPS has little value, and other signal has big relatively value, so can detect accurate more TPS position.Deliver to mobile adder unit 428 at interval by the value that divider 426 calculates, and be applicable to remaining element about the identical description among Fig. 5.
Fig. 7 is the flow chart that is used for being presented at the operation of the Frequency offset estimation device that Fig. 4 shows.With reference to figure 7, the TDS-OFDM signal that high speed Fourier modulating unit 200 receives in the time domain, and modulate this signal and become frequency-region signal (S500), and the size of frequency-region signal after TPS positional fault detecting unit 250 is relatively modulated and known TPS is come the detection position, and estimated frequency skew (S550) is come in more known TPS position and detected position.This TPS signal comprises the information about size and position.
Fig. 8 is the flow chart that is used for being presented at the operation of the Frequency offset estimation device that Fig. 5 shows.With reference to figure 8, the TDS-OFDM signal that high speed Fourier modulating unit 300 receives in the time domain, and modulate this signal and become frequency-region signal (S600), TPS position detection unit 320 receives frequency-region signal, and detect TPS position (S620), with TPS positional fault detecting unit 350 more detected TPS positional information and detected positional informations, and estimated frequency skew (S650).Say that at length step S620 estimates first power, i.e. the power (S621) of the frequency-region signal that receives from step S600.In addition, the signal that receives from step S600 is delayed a symbol time (S622), and estimates second power, the power (S623) of the signal after promptly postponing.Calculate poor (S624) between first power and second power, and at interval mobile adder unit 328 by move predetermined interval calculation about the difference that calculates and (S628).Detection have in step S628, obtain and in the position (S629) of one of minimum, this is based on such hypothesis, promptly all TPS signals are so identical, so that the power that the TPS signal is estimated is much at one, even and under the situation of general data, difference between two signals is big, and the difference between the current and first front signal of TPS position almost is " 0 ".Calculate frequency shift (FS) by detected position in step S629 relatively and known TPS position and the degree of finding out the TPS change of the signal that receives.This frequency offset computations method is applicable to when receiver because the change of the power of TPS and do not catch the TPS size, sends and the situation of reception period when pre-determining the TPS position at signal.
Fig. 9 is the flow chart that is used for being presented at the operation of the Frequency offset estimation device that Fig. 6 shows.Frequency offset estimation process that in Fig. 9, shows and the similar process that in Fig. 8, shows.Yet, be used for calculating the difference between first front signal and the current demand signal and obtaining the process of TPS position, if it is little being present in all power of the general signal of the position identical with the position of two signals, then, then when detecting the TPS position, can produce mistake because the differential that calculates is nearly 0.In order to address this problem, the step below having increased.With reference to figure 9, among Fig. 8 from beginning until step S624 is identical with step Fig. 9, and after these steps, also comprise two steps of S725 and S726.Step S725 be by addition first power and second power come rated output and, and step S726 is by difference power is come the rated output ratio divided by power.Therefore, it is big that the power ratio of two little values of general signal becomes, and the power ratio of TPS diminishes.Later those steps of following step and the step S624 among Fig. 8 are identical.
As mentioned above, the present invention can expand correctable frequency shift (FS) at interval by simple apparatus and method, and can estimate accurate frequency shift (FS) under the environment of the frequency decline owing to exist multipath to disturb.
As described above, by during Frequency offset estimation, use is used for the frequency domain TPS of the transmission of the parameter relevant with the transmission system of transmitter, and the present invention can prevent because the interference that causes of multipath, and calculates the frequency shift (FS) about compared with prior art wide interval.
Aforesaid embodiment and superiority only are exemplary, should not be interpreted as limitation of the present invention, and the device that can easily be applied to other types is stated in current religion.In addition, be illustrative to the description of the embodiment of the invention, be not limited to the scope of claims, those skilled in the art can carry out various deformation, improvement and modification.
Claims (12)
1, a kind of Frequency offset estimation device that is used for multi-carrier receiver comprises:
High speed Fourier modulating unit is used for transmission signals modulation becoming frequency-region signal; With
Transmission parameter signaling TPS positional fault detecting unit, the known dimensions information of use TPS signal detects the position of the TPS signal that is modulated to frequency domain, and comes the estimated frequency skew by more known TPS signal location and detected TPS signal location.
2, Frequency offset estimation device as claimed in claim 1, wherein, the signal of transmission is a time-domain synchronization OFDM TDS-OFDM signal, and the TPS signal is included in the TDS-OFDM signal.
3, a kind of Frequency offset estimation device that is used for multi-carrier receiver comprises:
High speed Fourier modulating unit is used for transmission signals modulation becoming frequency-region signal;
Transmission parameter signaling TPS position detection unit is used for detecting the position that has about the minimum value of the difference power between the current code element of frequency-region signal and the previous code element; With
TPS positional fault detecting unit is used for the position of more detected position and TPS signal, and judges the scope that move the position of TPS signal.
4, Frequency offset estimation device as claimed in claim 3, wherein, the TPS position detection unit comprises:
Delay cell is used to receive the frequency-region signal that is modulated by high speed Fourier modulating unit, and postpones the length of a code element of this signal;
First power estimation unit is used for the power of the signal behind the estimated delay;
Second power estimation unit is used to estimate from the power of the signal of high speed Fourier modulating unit transmission;
Subtrator is used to calculate from the power of first power estimation unit transmission and poor between the power of second power estimation unit transmission;
Mobile adder unit at interval, be used for predetermined interval move and calculate the different value that calculates by subtrator and; With
The minimum value position detection unit is used for detecting the interval of one of minimum with the value that is calculated by mobile adder unit at interval.
5, Frequency offset estimation device as claimed in claim 3, wherein, the TPS position detection unit comprises:
Delay cell is used to receive the frequency-region signal that is modulated by high speed Fourier modulating unit, and postpones the length of a code element of this signal;
First power estimation unit is used for the power of the signal behind the estimated delay;
Second power estimation unit is used to estimate from the power of the signal of high speed Fourier modulating unit transmission;
Subtrator is used to calculate from the power of first power estimation unit transmission and poor from the power of second power estimation unit transmission;
Adder unit, be used to calculate from the power of first power estimation unit transmission and from the power of second power estimation unit transmission and;
Divider, the value that is used for being calculated by subtrator is divided by the value that is calculated by adder unit;
Mobile adder unit at interval, be used for predetermined interval move and calculate the rate value that calculates by divider and; With
The minimum value position detection unit is used for detecting the position of one of minimum with the value that is calculated by mobile adder unit at interval.
6, Frequency offset estimation device as claimed in claim 3, wherein, transmission signals is the TDS-OFDM signal, and the TPS signal is included in the TDS-OFDM signal.
7, a kind of frequency offset estimation methods that is used for multi-carrier receiver comprises step:
High speed Fourier modulation step is used for transmission signals modulation becoming frequency-region signal; With
Transmission parameter signaling TPS positional fault detects step, and the known dimensions information of use TPS signal detects the position of the TPS signal that is modulated to frequency domain, and comes the estimated frequency skew by more known TPS signal location and detected TPS signal location.
8, frequency offset estimation methods as claimed in claim 7, wherein, transmission signals is the TDS-OFDM signal, and the TPS signal is included in the TDS-OFDM signal.
9, a kind of frequency offset estimation methods that is used for multi-carrier receiver comprises step:
High speed Fourier modulation step is used for transmission signals modulation becoming frequency-region signal;
Transmission parameter signaling TPS position probing step is used to detect the position that has about the least work rate variance between the current code element of frequency-region signal and the previous code element; With
The TPS positional fault detects step, is used for the position of more detected position and TPS signal, and judges the scope that move the position of TPS signal.
10, frequency offset estimation methods as claimed in claim 9, wherein, TPS position probing step comprises:
Postpone step, be used to receive the frequency-region signal that modulates by high speed Fourier modulation step, and postpone the length of a code element of this signal;
First power estimation step is used for the power of the signal behind the estimated delay;
Second power estimation step is used to estimate from the power of the signal of high speed Fourier modulation step transmission;
Subtraction process is used to calculate from the power of first power estimation unit transmission and poor between the power of second power estimation unit transmission;
Mobile addition step at interval, be used for predetermined interval move and calculate the value that calculates by subtraction process and; With
Minimum value position probing step, be used for detecting have calculate and the interval of one of minimum.
11, frequency offset estimation methods as claimed in claim 9, wherein, TPS position probing step comprises:
Postpone step, be used to receive the frequency-region signal that modulates by high speed Fourier modulation step, and postpone the length of a code element of this signal;
First power estimation step is used for the power of the signal behind the estimated delay;
Second power estimation step is used for estimating the power of the signal that transmits from high speed Fourier modulation step;
Subtraction process is used to calculate from the power of first power estimation step transmission and poor between the power of second power estimation step transmission;
The addition step, be used to calculate from the power of first power estimation step transmission and between the power of second power estimation step transmission and;
Be used for the difference that will calculate divided by calculate and, and calculate and the step of the ratio of difference;
Be used for predetermined interval move and the calculating ratio value and step; With
Minimum value position probing step, be used for detecting rate value with calculating and the interval of one of minimum.
12, frequency offset estimation methods as claimed in claim 9, wherein, the signal of transmission is the TDS-OFDM signal, and the TPS signal is included in the TDS-OFDM signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030036299A KR20040107566A (en) | 2003-06-05 | 2003-06-05 | estimater for frequency offset of Multi-carrier transmission receiving system and a method thereof |
| KR36299/03 | 2003-06-05 | ||
| KR36299/2003 | 2003-06-05 |
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| CN1574809A CN1574809A (en) | 2005-02-02 |
| CN100579097C true CN100579097C (en) | 2010-01-06 |
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| CN200410045250A Expired - Fee Related CN100579097C (en) | 2003-06-05 | 2004-06-04 | Frequency shift estimating device and method for multicarrier receiver |
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| CN (1) | CN100579097C (en) |
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| US8064913B2 (en) | 2007-03-21 | 2011-11-22 | Wi-Lan Inc. | Methods and apparatus for identifying subscriber station mobility |
| CN108363076B (en) * | 2018-01-16 | 2021-09-10 | 北京理工大学 | System and method for estimating instantaneous frequency of man-made interference based on short-time Renyi entropy |
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2003
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