CN105988106A

CN105988106A - Distance estimation

Info

Publication number: CN105988106A
Application number: CN201610592743.1A
Authority: CN
Inventors: A·H·阿玛莱南
Original assignee: Nokia Technologies Oy
Current assignee: Nokia Oyj; Nokia Technologies Oy
Priority date: 2007-08-14
Filing date: 2007-08-14
Publication date: 2016-10-05

Abstract

The invention discloses a method. The method comprises steps: at each first time, signal receiving at a receiver is started periodically; the received signals are converted to determine data in the received signals; the determined data and reference data are compared; and the difference between the determined data and the reference data is used for estimation for correcting the multiple of the first time. Thus, the distance between the receiver and the signal source is determined.

Description

Distance estimations

Cross-reference to related applications

The application be filing date on August 14th, 2007, Application No. 200780100301.X, The divisional application of the application for a patent for invention of invention entitled " distance estimations ".

Technical field

Embodiments of the present invention relate to distance estimations.In particular it relates to for using at least The device of the distance estimations of one radiofrequency signal, method, computer program, chipset and Module.

Background technology

Under many circumstances, it is desirable to determine the distance put from a point to another, in order to for example Positioning object.The distance between two points can be determined by using radio frequency (RF) ripple. Some distance determination method includes: use the first equipment to launch RF signal to the second equipment, with And by analyze the decay that has occurred and that during signal is propagated determine therebetween away from From.

Other distance determination methods comprise determining that the letter launched from the first equipment to the second equipment Number flight time, then use below equation:

D=c × t_tof (1)

Wherein d is equal to the distance between the first equipment and the second equipment, and c is the light velocity, and t_tofIt is to fly The row time.

So that distance estimations is accurate as far as possible, it should determine with error little as far as possible Flight time.

Content of the invention

According to the various embodiments of the present invention, provide a kind of method, comprising: each the Enable to a period of time the signal at receiver to receive；The signal that conversion receives, with Determine the data in the signal receiving；Data determined by and reference data compare； And difference between data and reference data determined by using estimate to the very first time times The correction of number, to determine the distance between receiver and the source of signal.

According to the various embodiments of the present invention, provide a kind of device, comprising: receiver, It is configured to periodically enable in each very first time with receipt signal；Translation circuit, joins Put for converting the described signal receiving, to determine the data in the signal receiving；Ratio Compared with device, be configured to determined by data compare with reference data；And estimate electricity Road, is configured to the difference between data and reference data determined by using and estimates to first The correction of the multiple of time, to determine the distance between receiver and the source of signal.

According to the various embodiments of the present invention, provide a kind of module, comprising: translation circuit, It is configured to convert the signal receiving to determine the data in the signal receiving, described letter It number is periodically received in each very first time；Comparator, be configured to really Fixed data and reference data compare；And estimating circuit, it is configured to use institute really Difference between fixed data and reference data estimates the correction of the multiple to the very first time, with Determine the distance between receiver and the source of signal.

According to the various embodiments of the present invention, provide a kind of chipset, comprising: conversion electricity Road, is configured to convert the signal receiving to determine the data in the signal receiving, institute State signal to be periodically received in each very first time；Comparator, it is right to be configured to Determined by data compare with reference data；And estimating circuit, it is configured to use Determined by difference between data and reference data estimate repairing of the multiple to the very first time Just, to determine the distance between receiver and the source of signal.

According to the various embodiments of the present invention, provide a kind of computer program, comprising: use In the signal that receives of conversion to determine the instruction of the data in the signal receiving, Qi Zhongsuo State signal to be periodically received in each very first time；For to determined by data The instruction comparing with reference data；And for data and reference number determined by use Difference between according to estimates the correction of the multiple to the very first time to determine receiver and signal The instruction of the distance between source.

Brief description

In order to be more fully understood that the various embodiments of the present invention, now by only with the side of example Formula is with reference to accompanying drawing, wherein:

Fig. 1 shows a kind of device；

Fig. 2 shows the first device launching signal to the second device；

Fig. 3 shows a kind of method of distance estimations；

Fig. 4 shows the schematic diagram of emitter；

Fig. 5 shows the schematic diagram of receiver；

Fig. 6 a shows the planisphere of QPSK；

Fig. 6 b shows the planisphere of QPSK, including represent measured data Value；

Fig. 7 shows the first signal launched from first device to the second device, and from The secondary signal that two devices is launched to first device；And

Fig. 8 shows the schematic block diagram of the second method of distance estimations.

Detailed description of the invention

Accompanying drawing shows a kind of device 10, comprising: receiver 18, be configured to each the Enable with receipt signal to a period of time；Translation circuit 306, is configured to conversion and receives The signal arriving, to determine the data in the signal receiving；Comparator 316, it is right to be configured to Determined by data compare with reference data；And estimating circuit 304 and 320, configuration For difference between data and reference data determined by using estimate to the very first time times The correction of number, to determine the distance between receiver and the source of signal.

Fig. 1 shows device 10.Device 10 can be for example portable electric appts.Device 10 include processor the 12nd, storage device the 14th, transceiver the 20th, user's output equipment 22 and User's input equipment 24.

Processor 12 is connected to storage device 14 to write it and to read.Storage sets Standby 14 can be single memory unit, or multiple memory cell.

Processor 12 be connected to user's input equipment 24 with receive from it input, user input Equipment 24 for example can include keypad and/or audio frequency input.Processor 12 is additionally coupled to use Family output equipment 22, to provide it output.User's output equipment 22 is for user's transmission Information, and for example can include display and audio frequency output.User's input equipment 24 and use Family output equipment 22 can be provided as individual unit, such as touch-screen display device.

Processor 12 can be used to receive input and Xiang Qiti from wireless set 20 For output.Wireless set 20 serves as emitter 16 and/or receiver 18.Radio is received Send out machine 20 and may be configured to launch and receive OFDM (OFDM) signal, all Such as WLAN (WLAN) 802.11a signal.

Multiple functional block used below describes receiver the 18th, emitter 16 and transceiver 20.Receiver the 18th, emitter 16 or transceiver 20 can include for performing these work( The single integrated circuit of energy or one group of integrated circuit (that is, chipset).Integrated circuit Special IC (ASIC) that one or more rigid line connects can be included and/or make to use tricks Calculation machine programmed instruction 26 performs one or more programmable processors of function.

May be embodied in module for performing the chip of embodiment of the present invention or chipset In.This module can be integrated in device 10, and/or can separate with device 10.

Although it will further be appreciated by those of ordinary skill in the art that and hereafter by emitter the 16th, function being described as Receiver 18 or transceiver 20 perform, but at least part of function can alternatively by The primary processor 12 of device 10 performs.Especially, time migration estimation and distance estimations Can be performed by processor 12.

Computer program instructions 26 can via electromagnetic carrier wave signal reach device 10, or from Such as computer program, memory or record medium (such as, CD-ROM or DVD) physical entity 28 copies to device 10.

Emitter the 16th, the storage device of receiver 18 or transceiver 20 or depositing of device 10 Storage equipment 12 can store computer program instructions 26, when being loaded in processor, and institute State the operation of computer program instructions control device 10.Computer program instructions 26 can carry For enabling devices to perform logic and the routine of method shown in Fig. 3 and Fig. 8.

Described computer program instructions provides:

For converting the described signal receiving to determine the finger of the data in the signal receiving Order, wherein said signal is at each very first time periodic receipt；

For to determined by the instruction that compares with reference data of data；And

Estimate to the very first time for the difference between data and reference data determined by use Multiple revise to determine the instruction of the distance between receiver and the source of signal.

Fig. 2 shows the first device to the second device 120 transmitting OFDM signal 130 110.First device 110 can use identical with device shown in Fig. 1 with the second device 120 Form.

Fig. 3 shows for estimating the first device 110 shown in Fig. 2 and the second device 120 The flow chart of method of spacing.

At the frame 140 of Fig. 3, first device 110 launches signal 130 to the second device 120.

Fig. 4 shows the functional schematic of the emitter 16 for launching signal 130.At this In embodiment, emitter 16 is configured to transmitting OFDM signal.Emitter 16 includes Relate to serioparallel exchange the 204th, symbol and create the 206th, conversion the 208th, digital-to-analogue conversion 212 and the 214th, Up-conversion 216 and the circuit of symbol clock 220.

The processor 12 of device 10 is configured to the deserializer 204 of emitter 16 defeated Go out serial bit stream 202.Serial bit stream 202 is the number will launched to the second device 120 According to.Deserializer 204 is by the data on intertexture serial bit stream 202, by serial ratio Special circulation is changed to N number of parallel bit stream 203.Fig. 4 illustrates that serial bit stream 202 is changed It is four parallel bit streams 203, this illustrates a specific embodiment of the present invention.In reality In trampling, serial bit stream can be converted into any number of parallel bit stream.

N number of parallel bit stream 203 is provided as input to symbol and creates circuit 206.Symbol Create circuit 206 to be configured to the segmentation of each in N number of parallel bit stream is converted to symbol Number.Each symbol can include any number of bit.Symbol creates circuit 206 according to symbol The time base period ground that number clock 220 is arranged creates symbol.

Symbol creates circuit 206 and creates N number of symbol, and these symbols are arranged on connection then In the bus 240 of symbol establishment circuit 206 and translation circuit 208.At symbol clock 220 Each cycle T_clockPeriod, N number of different symbol is arranging cycle T_setIn be arranged on In bus 240.Clock cycle T_clockProtection period T can be included_guard, during this cycle Not configuration information in bus 240, this makes translation circuit 208 can clearly distinguish symbol Number create the information timing changing that provided of circuit 206.If there is protection period, then T_clock =T_set+T_guard。

Symbol creates circuit 206 and Modulation and Amplitude Modulation or phase-shift keying (PSK) etc. can be used to modulate Technology creates symbol.One example of suitable modulation technique is QPSK (QPSK).In QPSK, bit stream is divided into in-phase component (I) and orthogonal point Amount (Q).Each symbol includes two bits.Fig. 6 a is by each possible QPSK symbol The vector point that position ([0,1], [1,1], [1,0], [0,0]) is shown as on planisphere is the 610th, the 620th, 630 and 640.

Translation circuit 208 performs conversion to incoming symbol.One example of proper transformation be from Dissipating inverse Fourier transform, input signal is changed to time domain from frequency domain by it.Fast Fourier transforma Scaling method can be used to perform inverse discrete Fourier transform.To N number of incoming symbol perform from After dissipating inverse Fourier transform, produce and include for each in N number of incoming symbol The signal of OFDM subcarrier.

The real part of each signal output of translation circuit 208 is fed as input to digital-to-analogue conversion Device (DAC) 212.Similarly, the imaginary part of each signal is supplied to DAC214.From DAC212, the output of 214 are provided to upconverter 216, and it is by the frequency of each signal Become eligible for the frequency that RF launches from baseband frequency.Upconverter 216 provides output to sky Line 218, ofdm signal 130 is launched by it as electromagnetic wave.

At the frame 150 of Fig. 3, at the antenna 322s of the second device 120, receive OFDM Signal 130.

Fig. 5 shows the functional schematic diagram of the receiver 18 of the second device 120, its configuration For receiving ofdm signal 130.Receiver 18 includes receiving symbol clock the 308th, lower change Frequently device the 314th, analog-digital converter (ADC) 310 and the 312nd, translation circuit the 306th, symbol estimate Meter circuit the 316th, parallel-to-serial converter the 302nd, time migration estimating circuit 320 and distance are estimated Meter circuit 321.

Receive symbol clock 308 and periodically enable antenna 322 to receive ofdm signal. When antenna 322 receives ofdm signal 130 between time suitable to moulding, it using signal as defeated Enter to be supplied to low-converter 314.Low-converter 314 reduces the ofdm signal receiving Frequency, and real part and the imaginary part of signal are supplied to an ADC 312 and the 2nd ADC 310.The real part of signal is supplied to translation circuit 306 (to digitize shape by the first ADC 312 Formula), and the 2nd ADC 310 provides imaginary part (in digitized form).

At the frame 160 of Fig. 3, perform conversion to the signal receiving to determine data.

The translation circuit 306 of receiver performs the performed change of translation circuit 208 of emitter 16 The inverse transformation changed.For example, the translation circuit 208 at emitter 16 is configured to carry out inversely Discrete Fourier transform with in the case of by signal from frequency-domain transform to time domain, receiver 18 Translation circuit 306 is configured to carry out discrete Fourier transform.Fast fourier transform algorithm Can be used to perform discrete Fourier transform.

Translation circuit 306 converts input signal (including real part and imaginary part) and by N number of data Symbol exports to sign estimation circuit 304, and wherein each outputting data signals is relevant with symbol.

At the frame 170 of Fig. 3, to determined by data (corresponding to receiving symbol) and reference number According to comparing, to determine have received which symbol.

Embodiment shown in Fig. 5 shows 4 row providing to sign estimation circuit 304 Signal, reflects four row symbols of the translation circuit 208 being supplied in emitter 16.Becoming The number of symbols recovering from the ofdm signal receiving after alternatively depends on inserting to be launched Number of symbols in signal.

Under ideal conditions, data (its table that the translation circuit 306 of receiver 18 is exported Show symbol) on planisphere, the symbol exactly corresponding to emitter 16 is created circuit 206 institute The symbol creating.If that is, the symbol of emitter 16 creates circuit 206 creates correspondence Point in Fig. 6 a the 610th, the 620th, 630 and 640 (represent respectively symbol [0,1], [1,1], [0,0] and [1,0]) symbol, then the translation circuit 306 of receiver 18 by output corresponding to point 610th, the 620th, 630 and 640 data.

But, if condition is undesirable, the data of translation circuit 306 output will not be strict Corresponding to vector point the 610th, the 620th, 630 and 640.

The sign estimation circuit 316 of receiver 18 includes storage device 318 and comparator 316. Storage device 318 storage is all with what the symbol establishment circuit 206 of emitter 16 can create The corresponding reference data of possible symbol.For example, in the QPSK example shown in Fig. 6 a, Corresponding to symbol the 610th, the 620th, the reference data storage of 630 and 640 in storage device 318 In.

Comparator 316 is configured to reference data and data determined by translation circuit 306 Compare.In the ideal case, comparator 316 can be determined according to comparing Data strictly mate with the reference data of storage, and therefore, it is possible to data determined by Que Dinging Related to which symbol.Under non-ideal conditions, comparator 316 is configured to according to comparing Data determined by determining are most possibly related to which reference symbol.

If the symbol clock of emitter 16 220 and the reception symbol clock 308 of receiver 18 Asynchronous, then there will be non-ideality, thus cause the translation circuit 306 of receiver 18 Determined by data relative in storage device 318 storage reference data generation phase offset.

If the 220th, symbol clock 308 is synchronization but the antenna of receiver 18 receives Electromagnetic signal be not with received with the identical phase place of electromagnetic signal launched (that is, If receiver 18 is not to correspond to integer signal wavelength from the distance of emitter 16), Also there will be non-ideal condition, thus cause determined by the translation circuit 306 of receiver 18 Data are relative to the reference data generation phase offset of storage in storage device 318.

Fig. 6 b show have to determined by the star of the related vector point 650 of the part of data Seat figure.Vector point 650 is related to symbol [1,1], but relative to by point 620 symbol being given The ideal position of number [1,1] there occurs phase offset.

Comparator 316 be configured to determined by data part with in storage device 318 The reference data of storage compares, and determines immediate with determined vector point 650 " ideal point ".In this instance, immediate ideal point is vector point 620, and it is corresponding to symbol Number [1,1].Comparator 316 is thus estimated: the part of determined data corresponds to symbol [1,1].

Once sign estimation circuit 304 had estimated which symbol with determined by data Correspondence, then export estimated symbol to parallel-to-serial converter 302.Parallel-to-serial converter 302 Merge N number of parallel bit stream (in the illustrated case, N=4) to produce serial bit stream 202, perform the performed inverse operation operating of deserializer 204 with emitter 16.Will The processor 12 that serial bit stream 202 exports to device is to process.

At the frame 180 of Fig. 3, estimate the distance between first device 110 and the second device 120.

Distance d between first device 110 and the second device 120 is given by the following formula:

D=c × t_tof (1)

Wherein c is the light velocity, and t_tofIt is the flight time of the signal receiving.

Consider following situation: receive symbol clock 308 according to identical with symbol clock 220 Cycleoperation, and synchronize with symbol clock 220.This can be by by first device 110 Launch and the realizing for information about of its clock to the second device 120.

In such a situation, it can be assumed that: the emitter 16 that measurement is arrived and receiver 18 it Between phase difference, be due to the electromagnetism of the electromagnetic signal that receives at receiver 18s and transmitting Signal is in out of phase and causes.

The flight time of the signal that rough estimate receives can be carried out in the following manner t_tof-approx: to electromagnetism ofdm signal 130 launch and reception between process, receive when The number n of the whole time cycle of clock 308 counts, and is then multiplied by reception clock 220 Cycle T_clock:

t_tof-approx=nT_clock (2)

Thus, the rough estimate of the spacing with the second device 120 for the first device 110 is:

d_approx=c × nT_clock (3)

But, this estimation adjusted the distance can be determined by the phase place of the signal receiving with Improving in various degree of the phase place of transmitting signal.

On planisphere, the position of each vector point is given by the following formula:

Z=Re^iθ (4)

Wherein z is the position of vector point on planisphere, and R is that point is to the half of the intersection point of homophase and normal axis Footpath, and θ is the angle between vector and lineups.

Phase offset θ between the vector point 650 of measurement and ideal vector point 620_offsetBy with Under be given:

θ_offset=θ₂–θ₁ (5)

Wherein θ₂It is the phase place from vector point 650 determined by the lineups measurement of planisphere, θ₁ It is the phase place (seeing Fig. 6 b) of ideal point 620.

Phase offset θ_offsetCan be used to clock period time T_clockN-th times repair Just, thus can also be to the rough estimate t of flight time_tof-approxBeing modified, this is to pass through Calculate time migration Δ t, wherein:

Δ t = \frac{θ_{o f f s e t}}{ω} - - - (6)

Wherein ω be determined by the angular frequency of vector point 650, that is, for detected symbol Sub-carrier frequencies.

Time migration estimating circuit 320 is configured to: receiving from sign estimation circuit 304 After relevant phase-shift information, perform the calculating providing in formula (6).

By by elapsed time number of cycles between the transmitting of electromagnetic signal and reception with average Time migration Δ t is added, the improved estimator of the flight time of the signal that can be received t_tof-imp:

t_tof-imp=nT+ Δ t (7)

Then carry out the adjusting the distance improvement of d of the improved estimator of flight time can be used to calculate:

d_est-imp=c × t_tof-imp (8)

Wherein d_est-impIt is the improved estimator of the spacing of first device the 110 to the second device 120.

Distance estimations circuit 321 is configured to: receiving from time migration estimating circuit 320 After related time migration information, perform the calculating providing in formula (7) and (8).

Alternatively, adjust the distance d_est-imp(for example, each subcarrier is once) can be estimated repeatedly, And it is averaged by distance estimations circuit 321, to reduce error.

Fig. 7 shows the OFDM launching from first device 710 to the second device 720 Signal 730, and the secondary signal 740 launched from the second device 720 to first device 710. First device 710 and the shape that the second device 720 uses and the device 10 described in Fig. 1 is identical Formula.

In this embodiment, first device 710 and the second device 720 each include receipts Sending out machine 20, it has the function of above-described emitter 16 and receiver 18.Should recognize Knowledge is arrived, and in Fig. 4 and Fig. 5, the schematic diagram of emitter 16 and receiver 18 shows transceiver Function when launching and receive.In these schematic diagrames, each assembly/frame does not needs and transceiver Independent component in 20 is related to.For example, for receive antenna 322 can be used for launching Antenna 218 identical.

In transceiver 20, the symbol clock 220 of emitter 16 and the reception of receiver 18 Clock 308 is synchronization, has identical periodicity, and can use identical clock Source operates.

Fig. 8 shows the flow chart of the method related to the embodiment of the present invention in Fig. 7. At frame 810, first device 710 launches the first signal 730 to the second device 720.From symbol When creator 206 creates the first symbol, first device 710 starts to die symbol clock 220 The period of time T gone_clockNumber n count.

At the frame 820 of Fig. 8, the second device 720 receives the first signal 730 stand-by period Period m T_clock, then launch secondary signal 740 to first device 710, wherein m is whole Number, T_clockIt is the cycle of symbol clock 220 in first device 710.

First device 710 receives secondary signal 740, and performs and above for Fig. 3's The reception of signal 130 in frame 150 and the identical process that discusses.

At the frame 830 of Fig. 8, according to the same way discussing with the frame 160 above for Fig. 3, The translation circuit 306 of receiver 18 performs conversion to the secondary signal receiving, to determine number According to.

At the frame 840 of Fig. 8, according to the same way describing with the frame 170 above for Fig. 3, Data determined by (symbol corresponding to receiving) compare with reference data, with Determine and have received which symbol.

At the frame 850 of Fig. 8, determined by use, the difference between data and reference data is estimated Distance between first device 710 and the second device 720.

As discussed above, it is possible to use formula 5 and 6 calculate for special symbol when Between shifted by delta t.Second equipment 720 is receiving the first signal 730 and is launching secondary signal 740 Between time used (be equal to mT_clock) it is known to first device 710, it is intended that Valuably, first device 710 can use below equation to determine the first signal and the second letter Number merging flight time t_tof-12:

t_tof-12=T_clock(n-m)+Δt (9)

Whenever the second device 720 launches second in response to the reception of the first signal 730 Signal 740, used between the reception and the transmitting of secondary signal 740 of the first signal 730 Time mT_clockCan keep identical, and this predetermined value can in first device 710 Know.(for example, because to use in the case that the second device 720 selects deviation predetermined value Transmitting channel unavailable), it can be in secondary signal 740 or to first device 710 Other signals launched include m or mT as data_clockThe instruction of value.

Estimated distance d from first device the 710 to the second device 720_estBy below equation (10) Be given:

d_{e s t} = \frac{c [T_{c l o c k} (n - m) + Δ t]}{2} - - - (10)

Alternatively, adjust the distance d_estCan estimate repeatedly (each subcarrier is once), and by Distance estimations circuit 321 is averaged to reduce error.

In some embodiments, can be at both first device 710 and the second device 720 Place determines the estimated distance d between first device 710 and the second device 720_est。

In one embodiment, can launch from first device 710 to the second device 720 3rd signal.First device 710 can use the first signal and secondary signal to determine estimation Distance d_est, and the second device 720 can use secondary signal and the 3rd signal to determine to estimate Meter distance d_est。

It is alternatively possible to launch the 3rd signal from the second device 720 to first device 710, And launch the 4th signal from first device to the second device 720.In this example, first Device 710 can use the first signal and secondary signal to determine estimated distance d_est, and second Device 720 can use the 3rd signal and the 4th signal to determine estimated distance d_est。

Its distance estimations for example can be transmitted to first device 710 by the second device 720, so that Obtaining first device 710 can use the estimate calculating at the second device 720s to produce flat Equal distance estimations.

At least part of frame shown in Fig. 3 and Fig. 8 can by the step in method for expressing and/or in terms of Code section in calculation machine program 26.It is right that the particular order of shown frame is not necessarily hint There is necessary order or preferably sequentially, the order of frame and arrangement can change for frame.

Although hereinbefore showing embodiments of the present invention by reference to various examples, but It is it is understood that can be in the case of without departing from claimed invention scope, to being given Example modify.

The feature being outlined above can be according to being different from the combination clearly having described that combination above Mode is used.

Although it is considered as to weigh especially that description above makes great efforts to be primarily focused on the present invention In those features wanted, but it is to be understood that inventor is claimed mention before this and/or Any shown in accompanying drawing can be by the feature of patent protection or combinations of features, whether to it Emphasized especially.

Claims

1. a method, comprising:

In each very first time, periodically enable the reception to signal at receiver；

The described signal that conversion receives, to determine the data in the described signal receiving；

The described data determining are compared with reference data；And

The difference between the described data determining and described reference data is used to estimate to described the The correction of the multiple of one time, with determine between described receiver and the source of described signal away from From.

2. method as claimed in claim 1, is wherein determined by the flight time of described signal Determine described distance, and the described flight time of described signal is to use the described very first time Multiple with the described correction of the described multiple of the described very first time determined.

3. such as the method for claim 1 or 2, wherein to the described data determining and described ginseng Examine data to compare, to determine that the phase place when launching for the described signal is connecing with described signal Phase difference between the phase place in time receiving, and use the described phase difference determining to estimate to institute State the described correction of the described multiple of the very first time, to determine described receiver and described signal Source between described distance.

4. method as claimed in claim 3, wherein if it is determined that there is no phase difference, then described ginseng Examine data and the described data of determination are identical.

5. such as the method for arbitrary aforementioned claim, wherein by described signal from frequency-domain transform to Time domain.

6. such as the method for arbitrary aforementioned claim, wherein to described receiver and described source it Between described distance take multiple measurements, use every time the different signals receiving, wherein Each signal receiving is the sub-carrier signal of OFDM.

7., such as the method for arbitrary aforementioned claim, wherein said receiver is transceiver, enters One step includes: described transceiver is to other signals of other transceiver and described subsequently Other transceivers are to signal described in described transceiver.

8. method as claimed in claim 7, other transceivers wherein said receive described its His signal and to the time used between signal described in described transceiver be described first when Between multiple.

9. method as claimed in claim 8, is wherein determined by the flight time of described signal Determine described distance, and the described flight time of described signal is to use the described very first time Multiple, the described time used by other transceivers described and the institute to the described very first time State what the correction of multiple determined.

10. a device, comprising:

Receiver, is configured to periodically enable in each very first time with receipt signal；

Translation circuit, is configured to convert the described signal receiving, to determine the institute receiving State the data in signal；

Comparator, is configured to compare the described data determining with reference data；And

Estimating circuit, is configured to use between the described data determining and described reference data Difference estimates the correction of multiple to the described very first time, with determine described receiver with described Distance between the source of signal.

The device of 11. such as claim 10, wherein said estimating circuit is configured to really The flight time of fixed described signal determines described distance, and the described flight of described signal Time is the institute of the multiple using the described very first time and the described multiple to the described very first time State what correction determined.

12. 1 kinds of modules, comprising:

Translation circuit, is configured to convert the signal receiving, to determine the described letter receiving Data in number, described signal is at each very first time periodic receipt；

Estimating circuit, is configured to use between the described data determining and described reference data Difference estimates the correction of the multiple to the described very first time, to determine receiver and described signal Source between distance.

The module of 13. such as claim 12, wherein said estimating circuit is configured to really The flight time of fixed described signal determines described distance, and the described flight of described signal Time is the institute of the multiple using the described very first time and the described multiple to the described very first time State what correction determined.

14. 1 kinds of chipsets, comprising:

Translation circuit, is configured to convert the signal receiving, to determine the described letter receiving Data in number, described signal was periodically received in each very first time；

The chipset of 15. such as claim 14, wherein said estimating circuit is configured to Determine that the flight time of described signal determines described distance, and fly described in described signal The row time is the multiple and the described multiple to the described very first time using the described very first time Described correction determines.

16. 1 kinds of equipment, comprising:

Receive device, in each very first time periodically receipt signal；

Converting means, the described signal receiving for conversion, to determine the described letter receiving Data in number；

Comparison means, for comparing with reference data to the described data determining；And

Estimation unit, for using the difference between the described data of determination and described reference data Estimate the correction of the multiple to the described very first time, to determine the source of receiver and described signal Between distance.

The equipment of 17. such as claim 16, wherein said estimation unit is configured to really The flight time of fixed described signal determines described distance, and the described flight of described signal Time is the institute of the multiple using the described very first time and the described multiple to the described very first time State what correction determined.

18. 1 kinds of computer programs, comprising:

For converting the signal receiving to determine the finger of the data in the described signal receiving Order, wherein said signal was periodically received in each very first time；

For the instruction that the described data determining are compared with reference data；And

For using the difference between the described data of determination and described reference data to estimate to institute State the correction of multiple of the very first time to determine the distance between receiver and the source of described signal Instruction.

The computer program of 19. such as claim 18, wherein said distance is to be determined by institute State what flight time of signal determined, and the described flight time of described signal is to use The multiple of the described very first time comes really with the described correction of the described multiple to the described very first time Fixed.