CN101313619B - Position location using phase-adjusted transmitters - Google Patents

Abstract

Systems and methods are provided for determining position location information in a wireless network. In one embodiment, timing offset information is communicated between multiple transmitters and one or more receivers. Such information enables accurate position or location determinations to be made that account for timing differences throughout the network. In another embodiment, transmitter phase adjustments are made that advance or delay transmissions from the transmitters to account for potential timing differences at receivers. In yet another aspect, combinations of timing offset communications and/or transmitter phase adjustments can be employed in the wireless network to facilitate position location determinations.

Description

Use phase place to adjust the location of reflector

Advocate the priority under 35 U.S.C. § 119

Present application for patent is advocated the 60/721st of being entitled as of application on September 27th, 2005 " POSITION LOCATION USINGTRANSMITTERS WITH TIMING OFFSET ", the priority of No. 505 provisional application cases, described provisional application case transfers this assignee and is incorporated herein clearly by reference at this.

Technical field

Present technique relates generally to communication system and method, and more particularly relates to the system and method for determining the location by use timing slip or transmitter phase adjustment technology in wireless network according to described network.

Background technology

A kind of technology of domination wireless system is code division multiple access (CDMA) digital radio technology.Except CDMA, air interface (air interface) normalized definition by FLO (only forward link) technology of wireless supplier's industry-led group exploitation.In general, FLO has utilized the feature that has superiority most of available wireless technology, and the latest developments of having used coding and system aspect are stably to realize the first water performance.The target of FLO is to become global accepted standard.

In one case, the FLO technology being used for the mobile multimedia environment, and is showed the performance characteristic that is very suitable for the honeycomb fashion mobile phone through design.Its latest developments of using coding and staggered aspect are all can realize at any time the reception of first water for real time content stream and other data, services.The FLO technology can provide sane travelling performance and high power capacity in the situation that do not damage power consumption.Described technology is also by greatly reducing the number of the reflector treat arrangement, and reduced to transmit the network cost of content of multimedia.In addition, replenished cellular network data and the voice service of cellular carrier based on the multimedia multicast of FLO technology, thereby to the same cellular mobile phone transferring content that is used on 3G network.

Except non real-time service, described FLO wireless system is also through designing to broadcast real-time audio and vision signal to the mobile subscriber.Each FLO transmission is to use tall and big and high-power reflector to carry out, to guarantee the broad coverage in given geographic area.In addition, in most of markets, 3 to 4 reflectors of arrangement are with the major part in the population of guaranteeing the given market of FLO signal arrival usually.Due to the cause of the coverage of FLO reflector, for instance, determine that based on triangulation technique the location is possible.Traditional position location techniques utilizes satellite-based gps signal to be used for range measurement.Yet the problem of satellite-based signal is that (for example, place that the sight line that arrives satellite can not realize) described signal is unavailable in indoor environment.On the contrary, the FLO network usually through design realizing indoor covering, and therefore respective waveforms can provide locating information to being positioned at indoor device.

Summary of the invention

For the basic comprehension to some aspect of embodiment is provided, the simplification summary of each embodiment is proposed hereinafter.This summary is not general introduction widely.The scope that it is not wished to indicate main/key element or describes embodiments disclosed herein.Its sole purpose is that the form of simplifying proposes some concept as the preamble in greater detail that proposes after a while.

The system and method that is provided for determining position or locating information in wireless network and substitutes (or combination) conventional global positioning system (GPS) technology.In one embodiment, use a plurality of reflectors (it solves the timing difference between reflector) to determine the location in radio network.The supposition of many location algorithms, transmission be used for the signal of range measurement reflector (such as) use such as the common center clock such as GPS and aim in time.Yet, in some broadcast system, with respect to the center clock and in advance/postpone to have some advantage from the transmission of some reflector to promote signal network to receive with quality.In this type of situation, location algorithm utilizes the timing slip information of reflector to obtain than the range measurement more accurately of conventional positioning component.Therefore, in certain embodiments, can transmit overhead parameters information (for example, timing slip information), and obtain range measurement accurately at the receiver place with this extraneous information.

In another embodiment, can be at the respective transmitters place in advance or the inhibit signal transmit timing to alleviate the needs that solve timing slip at the receiver place.By adjust the timing through signal transmission at the reflector place, can determine positional information accurately at receiver out of the ordinary place, alleviated timing slip calculating because solved with the timing mismatch of center clock at the reflector place simultaneously.As can understand, some system can comprise the timing slip that is delivered to receiver and/or in the combination of the timing adjustment at reflector place, to promote that the location is determined accurately.

In order to reach aforementioned and relevant purpose, this paper describes some illustrative embodiment in conjunction with the following description and drawings.The described embodiment of these aspect explanations can so as to the variety of way of practice, wish to contain all modes.

Description of drawings

Fig. 1 is the schematic block diagram of explanation wireless network location system.

Fig. 2 uses timing slip information to determine the instance system of location.

Fig. 3 explanation is used for the case technology of transmit timing offset information.

Fig. 4 explanation is used for adjusting at wireless location system the instance system of timing information.

Fig. 5 is the figure that explanation is used for the example network layers of wireless location system.

Fig. 6 is that explanation is used for the instance data structure of wireless location system and the figure of signal.

Fig. 7 explanation is used for the example timing process of wireless location system.

Fig. 8 is the figure that explanation is used for the instance user device of wireless system.

Fig. 9 is the figure that explanation is used for the example base station of wireless system.

Figure 10 is the figure that explanation is used for the example transceiver of wireless system.

Embodiment

Be provided for determining the system and method for locating information in wireless network.In one embodiment, transmit timing slip information between a plurality of reflectors and one or more receivers.This information makes it possible to solve accurate location or the location of the timing difference in network and determines.In another embodiment, carry out the transmitter phase adjustment, it in advance or postpone transmission from described reflector to solve described reflector together with the potential timing difference between clock.In this way, can position at the receiver place and determine and further timing adjustment.On the other hand, can use the combination of timing slip transmission and/or transmitter phase adjustment to promote location Calculation or to determine in wireless network.

It should be noted that timing slip can be considered the reflector clock together with the timing mismatch between clock source, it causes the synchronizing symbol at reflector place to be compared with a skew with the clock synchronizing signal together being transmitted.For instance, in the situation that forward link (FLO) signal only, expect that generally the superframe boundaries at reflector place is synchronizeed with 1 PPS signal from GPS.Yet the purpose for the network optimization in the time of due to timing mismatch or some is had a mind to for it, and in fact described superframe boundaries can be with respect to from the 1 PPS signal of GPS and in advance or postpone.This is called the timing slip at reflector place.

Phase place with regard to the reflector place is adjusted, and transmitter waveform is in fact through revising to regulate the propagation delay by the receiver perception, and does not consider the timing slip at reflector place.In the case, though the clock of described reflector (and therefore, transmission) may with described common clock source precise synchronization, described transmitter waveform also might cause the deflection propagation delay measurement result at receiver place through modification.For instance, in the situation that FLO uses the OFDM signaling, described superframe boundaries can be synchronizeed with 1 PPS signal from GPS.Yet described reflector can be adjusted the transmission phase place to the cyclic shift of OFDM symbol buffer by using.Can be based on the OFDM symbol of cyclic shift and form the Cyclic Prefix of OFDM symbol.By this modification of signal, by the delay of receiver perception with the variation of selected transmission phase place (or equivalently, the cyclic shift amount on the OFDM symbol) and change.This is called the phase place adjustment at reflector place.

As used in the present application, term " assembly ", " network ", " system " and similar terms wish to refer to computer related entity, and it is combination, software or the executory software of hardware, hardware and software.For instance, assembly can be (but being not limited to) and is executed in process, processor, object, executable code, execution thread, program and/or computer on processor.By explanation, the application program and the described device that are executed on communicator can be assemblies.One or more assemblies can reside in process and/or execution thread, and assembly can be confined on a computer and/or be scattered between two or more computers.And, can carry out these assemblies from the top various computer-readable medias that store various data structures.Described assembly can be (for example according to having the signal of one or more packets) communication on this locality and/or remote process (for example, from the data of an assembly in local system, distributed system and/or via such as wired or wireless network and another component interactions such as internets).

Fig. 1 illustrates wireless network location system 100.Described system 100 comprises one or more reflectors 110, and described reflector 110 is communicated by letter with one or more receivers 120 via wireless network.Described receiver 120 can comprise the communicator of any type substantially, such as cellular phone, computer, personal assistant, hand-hold type or laptop devices etc.Described system 100 uses one or more positioning components 130 to promote to determine position or the location of receiver 120.The Timing Synchronization information that generally, may need to adjust in various embodiment described herein between described reflector 110 and described receiver 120 is determined with the accurate location that promotes the receiver place.In one case, can transmit timing slip assembly 140 with the timing difference XOR adjustment in the wireless network that represents to determine to solve in assembly or algorithm in the location between reflector 110 and receiver 120.Another situation uses phase adjustment block 150 with in advance or inhibit signal at described reflector 110 places, described phase adjustment block 150 has the effect of contingent timing mismatch in bucking-out system 100 or difference.In other embodiments, can use simultaneously the various combinations of timing slip assembly 140 and/or phase adjustment block 150 to promote the location in wireless network location system 100 to determine.As described, can provide one or more frequency pilot signs 154 to carry out delay measurements.

In general, conventional location technology utilizes satellite-based gps signal to be used for range measurement.Yet, a problem of satellite-based signal be for example in the indoor environment that the sight line that arrives satellite can not realize signal unavailable.On the other hand, only the high power nature of forward link (FLO) transmission has promoted can use the FLO waveform in the disabled indoor environment of gps signal.Therefore, when available from the FLO signal of a plurality of reflectors, there is the alternative method of locating based on the measurement of carrying out according to the FLO signal.In the following description, can suppose the FLO receiver can access from may or may be not at the signal of at least three different FLO reflectors (may have other configuration) of transmission same information content.

Usually the FLO network deployment is used for single frequency network (SFN) operator scheme, makes reflector synchronous with clock source together in described pattern.Described clock source (for example) can be derived from 1 PPS signal from GPS.The FLO waveform is based on Orthodoxy Frequency Division Multiplex (OFDM) signaling, and can in the situation that the delay expansion of supposition (for example) channel will design less than about 135 us.When a plurality of reflectors 110 are visible for a receiver 120, be that described receiver is apart from the function of the relative position of each reflector by the delay expansion of described receiver perception.In some cases, described receiver 120 may be close to the one of described reflector 110, and away from another reflector, therefore causes larger delay expansion.If gained postpones the design specification (or other reference) that expansion surpasses 135 us, it can cause the remarkable loss of systematic function so.Yet, by postponing with respect to the lock-out pulse from the center clock or shifting to an earlier date superframe boundaries, might the each point place's control in network be expanded by the delay of receiver 120 perception.Therefore, in the FLO network deployment of optimizing, suppose to have between different reflectors 110 fixedly that timing slip may be also real.

In the SFN of FLO network arrangement, therefore described reflector 110 may be through tuning to operate with fixing timing slip with respect to center clock (and relative to each other), expand in the delay seen at described receiver 120 with optimization, and so optimization system performance.If the relative timing at reflector place skew is solved the range measurement that may adversely affect for the location.Yet, in the location and based on network location of movement-based, may solve the reflector timing slip by revising distance calculating.This can comprise the receiver 120 in the navigation system that makes the FLO network reflector timing slip information is provided to movement-based, adjusts the combination that transmit timing and phase signal or timing slip and signal are adjusted.

Fig. 2 illustrates and uses timing slip to determine the instance system 200 of location.In this example, reflector A, the B at 210 places and C can be preset time point be in three different FLO reflectors of the carrying FLO signal in the range of receiving of receiver 220.In addition, suppose d _a, d _bWith d _cThe expression respective transmitters is with respect to the timing slip 230 of common clock source 240.Herein, just be offset expression and will transmit with respect to described center clock 240 and shift to an earlier date, and negative bias moves expression with respect to described center clock transmission delay.Can suppose that receiver clock synchronizes with clock source 240 together on phase place and frequency.

Usually available FLO air interface specification allows each reflector 210 to insert the distinctive symbol of described reflector (being called the location pilot channel).These symbols can be through the propagation delay of design to allow receiver 220 to estimate from each of reflector 210.Described location pilot channel is in fact specific one group of pilot tones for each reflector, and it has high processing gain through design, makes channel with long delay spread and weak energy still can be detected at receiver 220 places.In the situation that from reflector 210 to receiver 220 without the remarkable line-of-sight propagations of scatterings, generally comprise single path via the channel estimation value of location pilot gained.Determine that based on the location of the channel path in channel estimation value receiver 220 is apart from the distance of reflector 210.

In system example 200, suppose τ _aBe based on the location from the single path in the channel estimation value of the location pilot channel of reflector A (or in the multipath situation, the path that at first arrives).Similarly, suppose τ _bWith τ _cIt is respectively the delay from the described path that at first arrives in the channel estimation value of reflector B and C.If the clock at described three reflectors 210 and described receiver 220 places is synchronous on frequency and phase place, multiply by according to the light velocity (c) propagation delay of measuring via described channel estimation value so and calculate receiver apart from the distance of reflector.Yet in the situation that there is timing slip in described reflector 210 places, the delay of measuring at described receiver 220 places should be proofreaied and correct by the timing slip 230 between reflector and receiver.Therefore, receiver is provided by following formula apart from the distance of reflector A:

S _a=(d _a+ τ _a) * c, wherein c is the light velocity.

Similarly, S _b=(d _b+ τ _b) * c and S _c=(d _c+ τ _c) * c.When receiver 220 is determined apart from the relative distance of three known locations (in the case, described known locations is the FLO reflector), the location of described receiver can obtain by well-known triangulation method.Described triangulation method is in fact to determine respectively with radius S _a, S _bWith S _cThe single joining of drawn circle around three reflector A, B and C.Therefore, apparent, in the situation that there is the relative timing skew at reflector 210 places, in order accurately to determine position or location, it is useful that receiver 220 is understood timing slip values 230.

Fig. 3 explanation is used for transmitting the case method of timing information 300.As understanding, exist some for timing slip information 300 being transferred to the possible technology of receiver.It should be noted that receiver is understood each of reflector enough with respect to the timing slip of common center clocks such as gps clock or other common clock.

At 310 places, a kind of possible transmission mechanism is, reflector is broadcasted information about timing slip with overhead symbol.For instance, in the FLO system, timing information from all reflectors in specific localized areas can be contained in local OIS field (overhead information symbol), and described local OIS field is specific for given regional area but change on the different regional areas in given wide area zone.An advantage of the method is that the reflector timing information is what localize.It should be noted that if receiver can't be from transmitter receipt location pilot channel, so described method can not provide the advantage that receives about the timing slip information of described reflector to receiver.On the other hand, local OIS field may be more vulnerable to interference than location pilot channel at the edge of coverage.Therefore, the possible location pilot channel of can successfully decoding of receiver but can not obtain timing information from local OIS channel.A kind of version of the method will be to comprise timing information at wide area OIS, and this is so that (and therefore, useful bandwidth) upper broadcsting transmitter timing information is the problem that cost is eliminated coverage edge in wider geographic area.

At 320 places, the possible technology of another transmit timing information is to embed the reflector timing information in location pilot channel (PPC).In the case, at first receiver can use the PPC from given reflector to estimate channel from described reflector, and then the timing information that is embedded in PPC is decoded.In the case, may must fully increase the processing gain of PPC with promotion in the situation that exist extraneous information in being embedded in symbol not affect detection probability to PPC.

At 330 places, the third of transmit timing information may technology be: the year calendar of reflector is broadcasted periodically as non real-time MLC (media FLO logic channel), and promoted receiver that this customizing messages MLC is decoded.At 340 places, another attractive technology revises for the PPC symbol timing slip information that transmitter waveform is alleviated the reflector place by considering timing slip, and Fig. 4 discusses below with reference to.

Fig. 4 explanation is used for adjusting at wireless location system the instance system 400 of timing information.In this example, two reflector A and B are illustrated in 410 places.At 420 places, can shift to an earlier date or postpone the signal from reflector 410, with timing difference possible in resolution system.Therefore, receiver 430 may be able to be determined the location, and needn't determine apart from the skew of center clock as mentioned above.Introduce in the FLO system 420 places in advance or delay transmitter concept regularly in order to regulate as postpone expansion by the efficient channel of receiver 430 perception.In one case, in ofdm system, if the delay of channel expansion can be treated to the circular convolution to the linear convolution of channel and institute's signal transmission so less than the Cyclic Prefix that ofdm signal uses.

In this example, suppose that the reflector A at 410 places and B have timing slip d _aWith d _bSuppose τ ' _aWill be by the actual delay of line of sight propagation component based on the perceived distance between reflector A and receiver 430.Similarly, suppose τ ' _bWill be by 430 the actual delay from reflector B to receiver of line of sight component perception.It should be noted that when postpone extended by tau ' _b-τ ' _aWhen surpassing Cyclic Prefix, the place introduces extra delay d at reflector _aWith d _b(supposition has a line of sight component from each of described reflector).The place postpones to be d at reflector _aWith d _bThe time, the signal that receives at the receiver place is provided by following formula:

Equation 1

y(n)＝h _a(n)*x _a(n-d _a)+h _b(n)*x _b(n-d _b)+w(n)，

H wherein _a(n) and x _a(n) be channel and signal about reflector A, * represents the linear convolution computing, and w (n) is the noise that adds at the receiver place.In the situation that the Traffic Channel in Wide Area Network, x _a(n) and x _b(n) identical (such as x (n)) substantially.

Use the characteristic of linear convolution, above equation can be write as,

Equation 2

y(n)＝h _a(n-d _a)*x(n)+h _b(n-d _b)*x(n)+w(n)

Therefore the channel delay spread of institute's perception existing by (τ ' _b-d _b)-(τ ' _a-d _a) provide, and can be by introducing timing slip at the reflector place and being controlled.When effective delay was expanded less than Cyclic Prefix, the received signal in equation 1 can be write as circular convolution and linear Convolution.Therefore:

Equation 3

$y\left(n\right)=h_a\left(n\right)\⊗x_a{(n-d_a)+h}_b\left(n\right)\⊗x_b(n-d_b)+w\left(n\right),$

Or equivalently,

Equation 4

$y\left(n\right)=h_a(n-d_a)\⊗x_a\left(n\right){+h}_b(n-d_b)\⊗x_b\left(n\right)+w\left(n\right)$

Wherein

Represent annular convolution.If the Cyclic Prefix long enough can pass through in equation 3 with d so _aRing rotation x _a(n) realize making signal x in equation 1 _a(n) postpone d _aTo obtain the operation of equation 3.

Based on above situation, for the pilot tone locating channel, following viewpoint is proposed about normal service channel.During normal service channel, the Cyclic Prefix that uses shorter (being 512 chips in the situation of FLO) and the cyclic shift technique therefore discussed in equation 3 usually can not be used to regulate effective delay expansion of channel.Therefore, (in this example, reflector A and B postpone d will to be subject to physically delay from the transmission of respective transmitters _aWith d _b) to satisfy the Cyclic Prefix requirement.On the other hand, for the location pilot channel, can use long loop prefix (be about 2500 chips in FLO, wherein chip refers to be encoded to the position in packet) in order to can estimate delay from remote weak reflector.In addition, the delay d that is introduced for Traffic Channel by reflector _aWith d _bCan affect the delay observation that carries out in the location pilot channel, therefore as discussed previously, the place needs this overhead information at receiver.

Suppose that the long loop prefix of pilot tone locating channel can use, reflector can be cancelled actual physical delays d by the cyclic shift of framing signal _aWith d _bImpact.If x _{A, p}(n) be to have a constant time lag d from reflector A _aSet framing signal, so described reflector can send by x _{A, p}(n+d _a) the cyclic shift version that provides.Similarly, cyclic shift is from the signal of reflector B.Owing to there being long loop prefix, so equation 3 is still effective, and therefore:

Equation 5

$y\left(n\right)=h_a\left(n\right)\⊗x_{a,p}\left(n\right){+h}_b\left(n\right)\⊗x_{b,p}\left(n\right)+w\left(n\right),$

Therefore alleviated demand from the reflector deferred message to receiver that send.Can use this technology to solve delay and other reflector timing slip that may cause due to the constant time lag that (for example) filter, cable and other this class component cause of introducing by as the part of the network planning.

About another embodiment, above discussion can suppose that range measurement is in mobile receiver place's calculating.Yet, but may carry out described calculating in the network of off-line acquisition timing information.In the case, receiver can be measured pseudorange S ' _a, S ' _bWith S ' _c, (for example) S ' wherein _a=τ _a* c, and do not consider the reflector timing slip.Receiver will be pseudorange S ' _aBe relayed to network, and can easily carry out at the network place the further correction of being undertaken by timing slip, because can make whole year calendar available at the network place.

Above discussion supposition receiver clock is together with the clock close synchronization, and the cause of adjusting due to timing slip or the phase place at reflector place, has mismatch between common clock and reflector clock.Yet, it should be noted that this can be considered special circumstances, and receiver clock needn't be synchronous with clock together.When receiver clock is not synchronous with clock together, also can comprise common bias term (bias term) from the delay measurements of respective transmitters, described common bias term is the amount of mismatch between common clock and receiver clock.Common deviation is now another calculative unknown quantity except the air coordinates of receiver.The unknown quantity of air coordinates and clock jitter can be by from the measurement result of additional transmitters and all obtained.In particular, having measurement result from (for example) four different reflectors (wherein with respect to the timing slip Information Availability of common clock source, and the supposition receiver is positioned on earth surface) just is enough to obtain air coordinates and the common clock jitter at receiver place.In the situation that there is not common clock jitter (that is, receiver clock is synchronous with clock together) in the receiver place, have from the delay measurements result of (for example) three different reflectors just enough.

Fig. 5 illustrates the example network layers 500 of wireless location system.

Fig. 5 shows only forward link (FLO) air interface protocol reference model.Usually, the FLO air interface specification has contained corresponding to having agreement and the service of layer 1 (physical layer) with the OSI6 of layer 2 (data link layers).Described data link layer further is further divided into two sublayers, i.e. medium access (MAC) sublayer and stream sublayer.Upper layer can comprise the compression of content of multimedia, to content and the format of multimedia access control and control information.

The FLO air interface specification does not specify upper layer realizing design flexibility usually, thereby supports various application and service.Show that these layers are for background is provided.Fluid layer comprises three upper layer flows nearly is multiplexed in a logic channel, upper layer packets is bound the stream of each logic channel, and packetize and residual error processing capacity are provided.The function that medium access is controlled (MAC) layer comprises to be controlled the mapping between access, logical channels and the physical channel of physical layer, multiplexing logic channel with transmission on physical channel, decomposes logic channel in mobile device place multichannel, and/or carries out service quality (QOS) requirement.The feature of physical layer is included as forward link channel architecture and definition frequency, modulation and coding requirement is provided.

Usually, the FLO technology is utilized Orthodoxy Frequency Division Multiplex (OFDM), and described OFDM is also utilized by digital audio broadcasting (DAB) 7, digital video broadcast-terrestrial (DVB-T) 8 and terrestrial integrated service digits broadcasting (ISDB-T) 9.Usually, the OFDM technology can realize spectral efficient, effectively satisfies the mobility requirement in large cell SFN simultaneously.And OFDM can process the long delay from the Cyclic Prefix with suitable length of a plurality of reflectors; To protect interval (it is the back-page copy of data symbol) to add the symbol front portion to promote orthogonality and to alleviate inter-carrier interference.As long as the length at this interval has just been eliminated the reflection of previous symbol and has kept orthogonality greater than maximum channel delay.

Advance to Fig. 6, its explanation FLO physical layer 600.Described FLO physical layer is used 4K pattern (producing the transform sizes of 4096 subcarriers), compares superior travelling performance thereby provide with the 8K pattern in useful sufficiently long protection interval in remaining on sizable SFN residential quarter.Can realize that Fast Channel obtains by pilot tone and the interleaver structure design of optimizing.The staggered mechanism that is incorporated in the FLO air interface has promoted time diversity.Pilot configuration and interleaver designs have been optimized channel usage and can not perplexed the user with long acquisition time.Usually, the signal of FLO transmission is organized into the superframe as 600 place explanations.Each superframe comprises four Frames, comprises TDM pilot tone (time division multiplexing), overhead information symbol (OIS) and contains the frame of wide area and local area data.The TDM pilot tone is through providing to realize the quick obtaining of OIS.OIS describes the position of the data of each media services that is used for superframe.

Usually, each superframe forms (6MHz totally 1200 symbols) by 200 OFDM symbols of bandwidth that every MHz distributes, and each symbol contain 7 of effective subcarrier staggered.Each staggered being dispersed in frequency is so that realize frequency diversity completely in available bandwidth.These are staggered is assigned in the duration logic channel of variation aspect the staggered number of the reality of using.This provides the flexibility by the time diversity of any data-oriented source realization.Can assign to the lower data rate channel less staggeredly improving time diversity, and more staggered so that wireless operating time of higher data rate channel usage minimizes and reduce power consumption.

Low data rate channel is usually identical with the acquisition time of high data rate channel.Therefore, but holding frequency and time diversity and do not make compromise aspect acquisition time.Often, the FLO logic channel is used for real-time (live stream) content of variable bit rate carrying to obtain possible statistical multiplexing gain by variable-rate codec (compressor reducer and decompressor unification).Each logic channel can have different code rates and modulate to support various reliabilities and the quality of service requirement of different application.The multiplexed mechanism of FLO makes the content that the device receiver can its single logic channel of being concerned about of rectification, so that power consumption minimizes.Mobile device simultaneously a plurality of logic channels of rectification so that the audio frequency that can send video and be associated on different channels.

Also but use error is proofreaied and correct and coding techniques.Usually, FLO incorporates into turbine ISN 13 and Li De Saloman (ReedSolomon, RS) 14 outer codes.Usually, turbo code packet contains Cyclical Redundancy Check (CRC).For the data of correct reception, need not to calculate the RS code, this causes extra power to be saved under favourable signal conditioning.Be on the other hand, the FLO air interface through design to support 5,6,7 and the frequency bandwidth of 8MHz.Use the single radio frequency channels can realize very good service provision.

Fig. 7 explanation is used for position and the position fixing process 700 of wireless system.Although for the simplicity of explaining, described method is showed and describes with a series of or some actions, but should be appreciated that and understand, due to some action can be different order and/or other action of showing and describe with this paper occur simultaneously, so the order that process described herein is not moved limits.For instance, be understood by those skilled in the art that and understand, a method alternately is expressed as a series of relevant states or event, for example in state diagram.In addition, being not illustrated everything all may be in order to the method for implementation basis subject methods disclosed herein.

Advance to 710, determine various correction of timings.This can comprise carries out the timing difference that calculates with between definite reflector, receiver and/or center clock source.This type of difference can be used to determine timing slip, and described timing slip can be used for receiver and sentences the difference of proofreading and correct with clock, and perhaps this type of calculating can be used to the degree of in advance definite or delay transmitter broadcasting in order to solve timing difference.Testing apparatus can be used to monitor potential system change, wherein receives feedback to promote to determine skew or launcher signal adjustment from such device.At 720 places, transmit to indicate potential receiver how to adjust position or location Calculation as the part of packet one or more timing slips.Perhaps, can be at 730 places in advance or inhibit signal with the timing difference with respect to the center clock in solving wireless network.As apprehensible, can use simultaneously two kinds of methods at 720 and 730 places.For instance, to utilize so adjustable signal at 730 places in advance or postpone may be favourable if change at the 720 constant time migrations of places transmission and environment or electric condition.These variations be can monitor, and can automatic adjustment system transmission or timing be come with closed loop mechanisms.On the other hand, can with transmit timing in advance or postpone to be applied as constant time migration in 720 place's dynamic calculation and transmission, to solve the potential variation that is detected.

At 740 places, receive signal and/or time migration calibrated or through adjusting.As mentioned above, but time of reception skew can receive with respect to the signal of clock through adjusting, but or the combination of time of reception skew and signal through adjusting.At 750 places, time migration and/or phase adjustment signal are used in one or more receivers places and determine the position.This Information Availability calculates the locating information that solves contingent difference between clock and reference source automatically.For instance, can be at the skew of indoor time of reception or phase adjustment signal to determine the position of receiver.

Fig. 8 is used for the explanation of the user's set 800 of wireless communications environment according to one or more aspects described in this paper.User's set 800 comprises receiver 802, it receives signal from (for example) reception antenna (not shown), and received signal is carried out typical action (for example, filtering, amplification, frequency reducing conversion etc.) thereon, and the signal of digitlization through adjusting is to obtain sample.Receiver 802 can be non-linear receiver, for example maximum likelihood (ML)-MMSE receiver or analog.But the frequency pilot sign that demodulator 804 rectification receive also is provided to processor 806 to be used for channel estimating with it.Provide FLO channel element 810 to process as described previously the FLO signal.This (especially) can comprise digital stream processing and/or location Calculation.Processor 806 can be to be exclusively used in the processor of analyzing the information that is received by receiver 802 and/or producing the information of transmitting for reflector 816, can be the processor of controlling one or more assemblies of user's set 800, and/or can be to analyze the processor that the information, the generation that are received by receiver 802 supply the information of reflector 816 transmission and control one or more assemblies of user's set 800.

User's set 800 can additionally comprise memory 808, it operationally is coupled to processor 806 and storage information, the rating calculation agreement relevant with the grade of calculating of user's set 800, comprises the look-up table of the information relevant with it, and the decoding that is used for support list scope (list-sphere) is to calculate any other suitable information of grade in the non-linear receiver of wireless communication system as described herein.But the agreement that memory 808 extra storage are relevant to rating calculation, matrix generation etc. is so that user's set 800 can use agreement and/or the algorithm stored realizing classification in non-linear receiver as described herein.

To understand, data storage (for example, memory) assembly described herein can be volatile memory or nonvolatile memory, maybe can comprise volatibility and nonvolatile memory.Unrestricted by explanation, nonvolatile memory can comprise read-only memory (ROM), programming ROM (PROM), electrically programmable ROM (EPROM), electrically-erasable ROM (EEROM) (EEPROM) or flash memory.Volatile memory can comprise random access memory (RAM), and it serves as external cache.Unrestricted by explanation, RAM can many form utilizations, for example synchronous random access memory (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate SDRAM (DDR SDRAM), enhancement mode SDRAM (ESDRAM), Synchlink DRAM (SLDRAM) and direct Rambus RAM (DRRAM).The memory 808 of thematic system and method is wished the memory including (but not limited to) these and any other suitable type.User's set 800 further comprises background monitor 812, the Symbol modulator 814 and the reflector 816 of transmission through modulation signal for the treatment of the FLO data.

Fig. 9 illustrated example system 900, it comprises base station 902, described base station 902 has and receives the receiver 910 of signals by a plurality of reception antennas 906 from one or more user's sets 904, and the reflector 924 that transmits to one or more user's sets 904 by transmitting antenna 908.Receiver 910 can be from reception antenna 906 reception information, and the demodulator 912 of the information that receives with rectification operationally is associated.Through the symbol of rectification by analyzing with and processor 914 that be coupled to memory 916 similar referring to the described processor of Fig. 8 above, described memory 916 storage information, the relative look-up tables relevant to user gradation, and/or any other suitable information relevant with function to the exercises of carrying out this paper elaboration.Processor 914 further is coupled to FLO channel 918 assemblies, and described FLO channel 918 assemblies promote to process the FLO information that is associated with one or more respective user devices 904.

Modulator 920 can be multiplexed for being transferred to user's set 904 by reflector 924 by transmitting antenna 908 with a signal.FLO channel element 918 information can be appended to the given transport stream that is used for communicating by letter with user's set 904 through the relevant signal of update data stream, described signal can be transferred to user's set 904 so that the indication of identifying and confirming new optimum channel to be provided.In this way, base station 902 can with user's set 904 interactions, described user's set 904 provide FLO information and be combined to use the decoding agreement such as non-linear receivers such as ML-MIMO receivers.

Figure 10 shows exemplary wireless communication system 1000.For for simplicity, described wireless communication system 1000 has been described a base station and a terminal.However, it should be understood that described system can comprise an above base station and/or an above terminal, wherein extra base station and/or terminal can be similar in fact or be different from exemplary base station described below and terminal.

Now referring to Figure 10, on down link, at access point 1005 places, launch (TX) data processor 1010 and receive, format, encode, interlock and modulate (or sign map) business datum and modulation symbol (" data symbol ") is provided.Symbol modulator 1015 receives and deal with data symbol and frequency pilot sign, and symbol stream is provided.Symbol modulator 1020 multiplexed datas and frequency pilot sign, and it is provided to transmitter unit (TMTR) 1020.Each transmission symbol can be data symbol, frequency pilot sign or signal values of zero.Pilot symbol transmitted continuously in each symbol period.Frequency pilot sign can be through frequency division multiplex (FDM), Orthodoxy Frequency Division Multiplex (OFDM), time division multiplexing (TDM), frequency division multiplex (FDM) or code division multiplex (CDM).

TMTR 1020 receiving symbols flow and the symbol circulation are changed to one or more analog signals, and further adjust the down link signal that (for example, amplification, filtering and up conversion) described analog signal is suitable for transmitting with generation on wireless channel.Then described down link signal is transferred to terminal via antenna 1025.At terminal 1030 places, antenna 1035 receives described down link signal and provides to acceptor unit (RCVR) 1040 signal that receives.The signal that acceptor unit 1040 adjustment (for example, filtering, amplification and frequency reducing conversion) receive and the signal of digitlization through adjusting are to obtain sample.The frequency pilot sign that symbol demodulator 1045 rectification receive and it is provided to processor 1050 to be used for channel estimating.Symbol demodulator 1045 is further from the frequency response estimated value of processor 1050 receiving downlinks, to the data symbol executing data rectification that receives to obtain data symbol estimated value (it is as the estimated value of the data symbol that transmitted), and described data symbol estimated value is provided to RX data processor 1055, described RX data processor 1055 rectification (that is, symbol de-maps), release of an interleave and the business datum of described data symbol estimated value to recover to be transmitted of decoding.The processing of being undertaken by symbol demodulator 1045 and RX data processor 1055 is respectively with complementary by the processing that Symbol modulator 1015 and TX data processor 1010 carry out at access point 1005 places.

On up link, TX data processor 1060 is processed business datum and data symbol is provided.Symbol modulator 1065 receive data symbols and data symbol and frequency pilot sign is multiplexed are carried out modulation, and symbol stream is provided.Transmitter unit 1070 then receives and process symbol flows to produce uplink signal, and described uplink signal is transferred to access point 1005 by antenna 1035.

At access point 1005 places, come the uplink signal of self terminal 1030 receive and process to obtain sample by acceptor unit 1075 by antenna 1025.Symbol demodulator 1080 is then processed described sample, and the frequency pilot sign that receives and the data symbol estimated value of up link are provided.RX data processor 1085 processing said data sign estimation values are to recover the business datum by terminal 1030 transmission.Processor 1090 is carried out channel estimating for each active terminal of transmitting on up link.A plurality of terminals can distinctly be uploaded transporting frequently through the pilot subband group of assigning at it simultaneously on up link, wherein said pilot subband group can be interlocked.

Processor 1090 and 1050 guides respectively (for example, control, coordination, management etc.) in the operation of access point 1005 with terminal 1030 places.Respective processors 1090 can be associated with the memory cell (not shown) of data with program code stored with 1050.Processor 1090 and 1050 also can be carried out frequency and the impulse response estimated value of calculating to derive respectively up link and down link.

For multiple access system (for example, FDMA, OFDMA, CDMA, TDMA etc.), a plurality of terminals can transmission simultaneously on up link.For this type systematic, pilot subbands can be shared between different terminals.The pilot subbands that described channel estimation technique can be used for each terminal is crossed in the situation of whole operational frequency bands (may except band edge).Described pilot subband structure will need for the frequency diversity that obtains each terminal.Technology described herein can be implemented by the whole bag of tricks.For instance, these technology may be implemented in hardware, software or its combination.For the hardware implementation scheme, the processing unit that is used for channel estimating may be implemented in one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, other through design carrying out the electronic unit of function described herein, or in its combination.Utilize software, can implement by the module (for example, program, function etc.) of carrying out function described herein.Software program code can be stored in memory cell and by processor 1090 and 1050 and carry out.

For the implement software scheme, technology described herein can use the module (for example, program, function etc.) of carrying out function described herein to implement.Software program code can be stored in memory cell and by processor and carry out.Memory cell may be implemented in processor or processor outside, in a rear situation its can be via technique in known the whole bag of tricks be coupled to communicatedly processor.

The content of above having described comprises exemplary embodiments.Certainly, can not describe for the purpose of describing described embodiment the every kind of combination that envisions of assembly or method, but one of ordinary skill in the art can recognize, many other combination and permutation are possible.Therefore, these embodiment wish to comprise all these type of changes, the modifications and variations in the spirit and scope that drop on appended claims.In addition, " comprise " with regard to term and be used for embodiment or claims, this type of term wishes that mode as comprising (inclusive) of boundary, is interpreted into transition vocabulary in use because " comprise " in the claims " to comprise " similarly with term.

Claims (30)

1. one kind in order to adjust the method for the positional information in wireless network, and it comprises:

Determine the time difference information between common clock and at least one reflector clock;

In response to the cyclic shift amount in the signal of adjusting, adjust the phase place of at least one reflector clock in view of determined time difference information; And

Determine the position of at least one receiver based on the phase place through adjusting of described reflector clock;

Determine that wherein described time difference information further comprises:

Produce at least two by d _aWith d _bThe timing slip of expression;

Determine the first parameter τ ' _a, described τ ' _aBased on the actual delay apart from institute's perception between the first reflector A and described at least one receiver by line of sight propagation component; And

Determine the second parameter τ ' _b, described τ ' _bIt is the actual delay from the second reflector B to described at least one receiver by the line of sight propagation component perception.

2. method according to claim 1, it further comprises from least two reflectors and produces signals, and described signal is through in advance or postpone to solve the timing difference in wireless network.

3. method according to claim 1, it further comprises reflector timing advance or the delay that makes in forward link network only, to regulate the delay expansion by the channel of described at least one receiver perception.

4. method according to claim 3, it further comprises: it further comprises channel and the execution linear convolution that transmits, if the described delay expansion of described channel is less than the Cyclic Prefix that is used by Orthodoxy Frequency Division Multiplex (OFDM) signal, so described linear convolution is processed as circular convolution.

5. method according to claim 1, it further comprises: when postpone extended by tau ' _b-τ ' _aWhen surpassing Cyclic Prefix,

Manage timing slip d everywhere at described first and second reflector _aWith d _b

6. method according to claim 5, it further comprises processes following equation:

Y (n)=h _a(n) * x _a(n-d _a)+h _b(n) * x _b(n-d _b)+w (n), wherein y (n) is illustrated in the signal of described at least one receiver place's reception, h _a(n) and x _a(n) be channel and signal about described the first reflector A, h _b(n) and x _b(n) be channel and signal about described the second reflector B, * represents the linear convolution computing, and w (n) is the noise that adds at described at least one receiver place.

7. method according to claim 6, it further comprises processes following equation:

Y (n)=h _a(n-d _a) * x (n)+h _b(n-d _b) * x (n)+w (n), wherein postpone expansion by (τ ' _b-d _b)-(τ ' _a-d _a) provide, and by being controlled at described first or second reflector place's introducing timing slip.

8. method according to claim 6, it further comprises: when postponing expansion less than Cyclic Prefix, as determining circular convolution in following equation:

$y\left(n\right)=h_a\left(n\right)\⊗x_a(n-d_a)+h_b\left(n\right)\⊗x_b(n-d_b)+w\left(n\right),$

Or

$y\left(n\right)=h_a(n-d_a)\⊗x_a\left(n\right)+h_b(n-d_b)\⊗x_b\left(n\right)+w\left(n\right)$

Wherein

The expression circular convolution.

9. method according to claim 8, it further comprises the transmission that postpones from reflector to satisfy the Cyclic Prefix requirement.

10. method according to claim 8, it further comprises and uses long loop prefix so that can estimate delay from remote weak reflector.

11. method according to claim 10, it further comprises the impact of cancelling physical delay by the cyclic shift of framing signal, wherein x _{A, p}(n) be from having timing slip d _aThe set framing signal of described reflector A, and reflector sends by x _{A, p}(n+d _a) the cyclic shift version that provides.

12. method according to claim 11, it further comprises processes following equation

$y\left(n\right)=h_a\left(n\right)\⊗x_{a,p}\left(n\right)+h_b\left(n\right)\⊗x_{b,p}\left(n\right)+w\left(n\right),$ To alleviate, the reflector deferred message is sent to receiver.

13. method according to claim 1, it further comprises from the offline network source determines the reflector timing adjustment.

14. method according to claim 13, it further comprises the pseudorange of measuring described reflector timing adjustment.

15. method according to claim 14, it further comprises described pseudorange is relayed to the network year calendar.

16. the system in order to adjustment positional information in wireless network, it comprises:

Be used for determining the device of the time difference information between at least two reflectors of wireless network and at least one receiver; And

Be used for to adjust the signal phase of described at least two reflectors or the device of signal frequency in view of determined time difference information in response to the cyclic shift amount that is applied to signal by each of described at least two reflectors of adjusting;

Wherein said device for determining time difference information further comprises:

For generation of at least two by d _aWith d _bThe device of the timing slip of expression;

Be used for determining the first parameter τ ' _a, described τ ' _aBased on the device apart from the actual delay of institute's perception between the first reflector A and described at least one receiver by line of sight propagation component; And

Be used for determining the second parameter τ ' _b, described τ ' _bIt is the device from the second reflector B to the actual delay of described at least one receiver by the line of sight propagation component perception.

17. system according to claim 16, it further comprises for determine the device of a position at described at least one receiver place in view of the signal phase of adjusting or signal frequency.

18. a method of adjusting at least one reflector clock comprises:

Determine that common clock is with respect to the time difference information between a reflector clock subgroup; And

Be applied to the cyclic shift amount of signal in response to the reflector of adjusting, adjust phase place or the frequency of at least one reflector clock of reflector clock subgroup in view of determined time difference information;

Determine that wherein described time difference information further comprises:

Produce at least two by d _aWith d _bThe timing slip of expression;

Determine the first parameter τ ' _a, described τ ' _aBased on the actual delay apart from institute's perception between the first reflector A and described at least one receiver by line of sight propagation component; And

Determine the second parameter τ ' _b, described τ ' _bIt is the actual delay from the second reflector B to described at least one receiver by the line of sight propagation component perception.

19. method according to claim 18, it further comprises the described location of determining at least one receiver through adjusting phase place or frequency based on described reflector.

20. method according to claim 19, it further comprises with triangulation technique and described reflector clock subgroup determines described location.

21. method according to claim 18, it further comprises determines at least one only forward link parameter.

22. method according to claim 18, it further comprises layer assembly, and described layer assembly has at least one in physical layer, fluid layer, medium access layer and upper layer.

23. method according to claim 22, described physical layer further comprise at least one in frame field, pilot field, overhead information field, wide-area fields and local field.

24. method according to claim 23, it further comprises the error correction field.

25. a Wireless Telecom Equipment, it comprises:

Be used for to determine on wireless network the device of base when adjusting between receiver and reflector; And

Be used for adjusting signal phase in order to determine the device of the location of at least one receiver in response to the cyclic shift amount by the signal of at least one transmission of described reflector of adjusting;

Wherein said device for determining base when adjusting further comprises:

For generation of at least two by d _aWith d _bThe device of the timing slip of expression;

Be used for determining the first parameter τ ' _a, described τ ' _aBased on the device apart from the actual delay of institute's perception between the first reflector A and described at least one receiver by line of sight propagation component; And

Be used for determining the second parameter τ ' _b, described τ ' _bIt is the device from the second reflector B to the actual delay of described at least one receiver by the line of sight propagation component perception.

26. equipment according to claim 25, it further comprises the device for the location of determining described receiver.

27. equipment according to claim 25, it further comprises the device of decoding for to forward link data stream only.

28. an equipment that is used for the base station resource of operate wireless network, it comprises:

The device that is used for the time difference information of definite reflector subgroup and at least one receiver;

Be used for to adjust in view of determined time difference information in response to the cyclic shift amount of the signal that is applied to described reflector subgroup place of adjusting the device of signal phase; And

Be used for based on determine the device of the position of described at least one receiver through the signal phase of adjusting;

Wherein said device for determining time difference information further comprises:

For generation of at least two by d _aWith d _bThe device of the timing slip of expression;

Be used for determining the first parameter τ ' _a, described τ ' _aBased on the device apart from the actual delay of institute's perception between the first reflector A and described at least one receiver by line of sight propagation component; And

Be used for determining the second parameter τ ' _b, described τ ' _bIt is the device from the second reflector B to the actual delay of described at least one receiver by the line of sight propagation component perception.

29. equipment according to claim 28, it further comprises for produce the device of signal from least two reflectors of described reflector subgroup, and described signal is through shifting to an earlier date or postponing to solve the timing difference in wireless network.

30. equipment according to claim 29, it further comprises the device for the linear convolution that calculates channel estimation value and the signal through transmitting.

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