CN101313619A - 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 the 35U.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 design 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 the reception of first water at any time for real time content stream and other data, services.The FLO technology can provide sane travelling performance and high power capacity under the situation of not damaging 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, the cellular network data and the voice service that have replenished cellular carrier based on the multimedia multicast of FLO technology, thus transmit content to the same cellular mobile phone that is used on the 3G network.

Except the 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 the given geographic area.In addition, in most of markets, usually 3 to 4 reflectors of arrangement arrive the major part in the population in given market to guarantee the FLO signal.Because the cause of the coverage of FLO reflector for instance, determines 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 to propose some notion as the preamble in greater detail that proposes after a while with the form of simplifying.

Be provided in wireless network, determining the system and method for position or locating information and alternative (or combination) conventional global positioning system (GPS) technology.In one embodiment, use a plurality of reflectors (it solves the timing difference between the reflector) to determine the location in the radio network.The reflector (for example) that the supposition of many location algorithms, transmission are used for the signal of range measurement for example uses common center clock such as GPS and aims in time.Yet, in some broadcast system, with respect to the center clock and in advance/postpone to have some advantage to promote signal the network to receive with quality from the transmission of some reflector.Under 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 use this extraneous information to obtain range measurement accurately at the receiver place.

In another embodiment, can shift to an earlier date at the respective transmitters place or the inhibit signal transmit timing to alleviate the needs that solve timing slip at the receiver place.By adjust timing at the reflector place through transmission signals, can determine positional information accurately at receiver place out of the ordinary, alleviated timing slip calculating because of having solved with the timing mismatch of center clock simultaneously at the reflector place.As understanding, some system can comprise timing slip that is delivered to receiver and/or the combination of adjusting in the timing at reflector place, determines to promote accurate in locating.

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

Description of drawings

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

Fig. 2 is to use 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 in wireless network, determining the system and method for locating information.In one embodiment, between a plurality of reflectors and one or more receivers, transmit timing slip information.This information makes it possible to solve the accurate position or the location of the timing difference in the 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 the clock.In this way, can position at the receiver place and determine and need not further regularly adjust.On the other hand, in wireless network, can use the combination of timing slip transmission and/or transmitter phase adjustment to promote location Calculation or to determine.

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

Adjust with regard to the phase place at reflector place, transmitter waveform is in fact through revising regulating the propagation delay by the receiver perception, and do 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, use at FLO under the situation of OFDM signaling, described superframe boundaries can with the 1PPS signal Synchronization 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 the processor.By explanation, the application program and the described device that are executed on the communicator can be assemblies.One or more assemblies can reside in process and/or the execution thread, and assembly can be confined on the computer and/or is scattered between two or two the above 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 the remote process (for example, from the data of an assembly in local system, distributed system and/or via wired or wireless network and another component interactions such as for example 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 kind, for example cellular phone, computer, personal assistant, hand-hold type or laptop devices etc. substantially.Described system 100 uses one or more positioning components 130 to promote to determine the position or the location of receiver 120.Generally, the timing synchronizing information that may need to adjust in various embodiment described herein between described reflector 110 and the described receiver 120 is determined with the accurate location that promotes the receiver place.In one case, can transmit timing slip assembly 140 between reflector 110 and receiver 120 will be in the timing difference XOR adjustment in the wireless network that the location is determined to solve in assembly or the algorithm with expression.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 the bucking-out system 100 or difference.In other embodiments, can use the various combinations of timing slip assembly 140 and/or phase adjustment block 150 to determine simultaneously to promote the location in the wireless network location system 100.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, but when the FLO signal time spent from a plurality of reflectors, the alternative method that existence is located 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, in described pattern, make reflector synchronous with the clock source together.Described clock source (for example) can be derived from the 1PPS signal from GPS.The FLO waveform is based on Orthodoxy Frequency Division Multiplex OFDM) signaling, and can will design under the situation less than about 135us in the delay expansion of supposition (for example) channel.When a plurality of reflectors 110 are visible for a receiver 120, be the function of described receiver apart from the relative position of each reflector by the delay expansion of described receiver perception.In some cases, described receiver 120 may approach one of described reflector 110, and away from another reflector, therefore causes bigger delay expansion.If gained postpones the design specification (or other reference) that expansion surpasses 135us, it can cause the remarkable loss of systematic function so.Yet,, might the each point place control in network expand by the delay of receiver 120 perception by postponing with respect to lock-out pulse or shifting to an earlier date superframe boundaries from the center clock.Therefore, in the FLO network deployment of optimizing, suppose to have between different reflectors 110 fixedly that timing slip also may be real.

In the SFN of FLO network arrangement, described reflector 110 may through tuning with therefore with respect to center clock (and relative to each other) with fixedly timing slip operation, optimizing the delay expansion seen at the described receiver 120, and so optimization system performance.If being solved, the relative timing at reflector place skew may influence the range measurement that is used to locate unfriendly.Yet, in based on location of moving and based on network location, may solve the reflector timing slip by revising distance calculation.This can comprise makes the FLO network that reflector timing slip information is provided to based on the receiver 120 in the navigation system that moves, and 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 can be three different FLO reflectors putting the carrying FLO signal in the range of receiving that is in receiver 220 in preset time with C.In addition, suppose d _a, d _bWith d _cThe expression respective transmitters is with respect to the timing slip 230 in common clock source 240.Herein, just be offset expression and will transmitting in advance, and negative bias moves expression with respect to described center clock transmission delay with respect to described center clock 240.Can suppose that receiver clock is synchronous 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 comes down to specific one group of pilot tones at each reflector, and it has high processing gain through design, makes the channel with long delay spread and weak energy still can be detected at receiver 220 places.Under the situation of the line-of-sight propagation of 220 no remarkable scatterings, generally comprise single path via the channel estimation value of location pilot gained from reflector 210 to receiver.Determine the distance of receiver 220 apart from reflector 210 based on the location of the channel path in the channel estimation value.

In system example 200, suppose τ _aBe based on location from the single path in the channel estimation value of the location pilot channel of reflector A (or under the multipath situation, at first the path of Dao Daing).Similarly, suppose τ _bWith τ _cIt is respectively 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 synchronously, multiply by the propagation delay of measuring via described channel estimation value according to the light velocity (c) so and calculates the distance of receiver apart from reflector on frequency and phase place.Yet 210 places exist under the situation of timing slip at described reflector, and the delay of measuring at described receiver 220 places should be proofreaied and correct by the timing slip between reflector and the receiver 230.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 comes down 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, have at reflector 210 places under the situation of relative timing skew, in order accurately to determine position or location, it is useful that receiver 220 is understood timing slip value 230.

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

At 310 places, a kind of possible transmission mechanism is that reflector use overhead symbol is broadcasted the information about timing slip.For instance, in the FLO system, timing information from all reflectors in the specific localized areas can be contained in the local OIS field (overhead information symbol), and described local OIS field is specific at 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 of reception 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 in wide area OIS, this with in wider geographic area (and therefore, useful bandwidth) to go up the broadcsting transmitter timing information be the problem that cost is eliminated coverage edge.

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, receiver can at first use the PPC from given reflector to estimate channel from described reflector, and then the timing information that is embedded among the PPC is decoded.In the case, may must fully increase the processing gain of PPC to promote under having the situation that is embedded in the extraneous information in the symbol, not influence 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 (medium FLO logic channel), and promoted receiver that this customizing messages MLC is decoded.At 340 places, another attractive technology is revised the timing slip information that transmitter waveform is alleviated the reflector place by considering timing slip at the PPC symbol, 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 signal, with timing difference possible in the resolution system from reflector 410.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.In the FLO system, introduce 420 places in advance or delay transmitter notion regularly so that regulate as postpone expansion by the efficient channel of receiver 430 perception.In one case, in ofdm system, if the delay of channel is expanded less than the employed Cyclic Prefix of ofdm signal, the linear convolution to channel and institute's transmission signals can be treated to circular convolution so.

In this example, suppose that the reflector A at 410 places and B have timing slip d _aWith d _bSuppose τ ' _aBe will be by line of sight propagation component based on the actual delay between reflector A and the receiver 430 apart from perception.Similarly, suppose τ ' _bBe will 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, introduce extra delay d at the reflector place _aWith d _b(supposition has a line of sight component from each of described reflector).Postpone to be d at the reflector place _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.Under the situation of the Traffic Channel in Wide Area Network, x _a(n) and x _b(n) identical substantially (such as x (n)).

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 controlled by introducing timing slip at the reflector place.When effective delay was expanded less than Cyclic Prefix, the received signal in the equation 1 can be write as circular convolution but not 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) be implemented in and make signal x in the equation 1 _a(n) postpone d _aTo obtain the operation of equation 3.

Based on above situation, at the pilot tone locating channel following viewpoint is proposed about normal service channel.During normal service channel, employed Cyclic Prefix is lacked (being 512 chips under the situation of FLO) usually and the cyclic shift technique therefore discussed in equation 3 can not be used to regulate effective delay expansion of channel.Therefore, (in this example, reflector A and B postpone d will to be subjected 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 is meant the position that is encoded in the packet) so that can estimate delay from remote weak reflector.In addition, the delay d that introduces for Traffic Channel by reflector _aWith d _bCan influence the delay observation of in the location pilot channel, carrying out, therefore as discussed previously, need this overhead information at the receiver place.

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 _bInfluence.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.Since there is 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 the reflector timing slip that causes by the delay of introducing as the part of the network planning and other constant time lag that may cause owing to (for example) filter, cable and other this class component.

About another embodiment, more than discuss and to suppose that range measurement calculates at the mobile receiver place.Yet, but may in the network of off-line acquisition timing information, carry out described calculating.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 the further correction of being undertaken by timing slip, because can make whole year calendar available at the network place at the network place.

More than discuss the supposition receiver clock together with the clock close synchronization, and because there is mismatch in the cause that the timing slip at reflector place or phase place are adjusted between common clock and the 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 not together with clock when synchronous, 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 the receiver clock.Common bias now is 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 can use with respect to the timing slip information in common clock source, and the supposition receiver being positioned on the earth surface) just is enough to obtain the air coordinates and the common clock jitter at receiver place.Do not exist at the receiver place under the situation of common clock jitter (that is, receiver clock is synchronous with clock together), 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 the content and the format of multimedia access control and control information.

The FLO air interface specification does not specify upper layer with the realization 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 the logic channel, upper layer packets is bound the stream of each logic channel, and packetize and residual error processing capacity are provided.The function of medium access control (MAC) layer comprise control to the mapping between access, logical channels and the physical channel of physical layer, multiplexing logic channel with transmission on physical channel, decompose logic channel in mobile device place multichannel, and/or carry 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 the big cell SFN simultaneously.And OFDM can handle the long delay from the Cyclic Prefix with suitable length of a plurality of reflectors: will 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 this length has at interval just been eliminated the reflection of previous symbol and has been 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 the useful sufficiently long protection interval in remaining on sizable SFN sub-district.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 the explanation of 600 places.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 obtaining fast of OIS.OIS describes the position of the data of each media services that is used for superframe.

Usually, each superframe is formed (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 the frequency is so that realize frequency diversity completely in available bandwidth.These staggered logic channels that change aspect duration and the staggered number of employed reality that are assigned to.This provides the flexibility of the time diversity that is realized by any given data source.Can assign less staggeredly improving time diversity to the lower data rate channel, and more staggered so that wireless operating time of higher data rate channel usage minimizes and reduce power consumption.

Low data rate channel is identical usually with the acquisition time of high data rate channel.Therefore, but holding frequency and time diversity and aspect acquisition time, do not make compromise.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 the 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 on different channels, send video and be associated.

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 sign indicating numbers.Usually, turbo code packet contains Cyclical Redundancy Check (CRC).For the data of correct reception, need not to calculate the RS sign indicating number, this causes extra power-saving 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 the position and the position fixing process 700 of wireless system.Although for the simplicity of explaining, described method is showed with a series of or some actions and is described, but should be appreciated that and understand, because the order that some action can be different and/or show and describe with this paper other move generation 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 that a method alternately is expressed as a series of relevant states or incident, 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 the clock source, center.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 so that 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 this type of device.At 720 places, with one or more timing slips as the part of packet and transmit to indicate potential receiver how to adjust position or location Calculation.Perhaps, can be at 730 places in advance or inhibit signal to solve the timing difference in the wireless network with respect to the center clock.As apprehensible, can use two kinds of methods at 720 and 730 places simultaneously.For instance, change and utilize adjustable signal in advance or to postpone may be favourable so at 730 places if transmit constant time migration and environment or electric condition at 720 places.Can monitor these variations, and can use closed loop mechanisms to come automatic adjustment system transmission or timing.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 receiver places and determine the position.This information can be used to calculate automatically the locating information that solves contingent difference between clock and the reference source.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 the explanation that one or more aspects of setting forth according to this paper are used for the user's set 800 of wireless communications environment.User's set 800 comprises receiver 802, and it is from (for example) reception antenna (not shown) received signal, and received signal is carried out typical action (for example, filtering, amplification, down converted 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 are received also is provided to processor 806 to be used for channel estimating with it.Provide FLO channel element 810 to handle the FLO signal as described previously.This (especially) can comprise digital stream processing and/or location Calculation.Processor 806 can be to be exclusively used in the processor of analysis by the information and/or generation confession reflector 816 information transmitted of receiver 802 receptions, can be the processor of one or more assemblies of control user's set 800, and/maybe can be to analyze the information that receives by receiver 802, the processor that produces one or more assemblies that supply reflector 816 information transmitted and control user's set 800.

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

To understand, storage described herein (for example, memory) assembly 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 including (but not limited to) these and any other suitable type of memory.User's set 800 further comprises background monitor 812, the Symbol modulator 814 and the reflector 816 of transmission through modulation signal that is used to handle the FLO data.

Fig. 9 illustrated example system 900, it comprises base station 902, described base station 902 has by the receiver 910 of a plurality of reception antennas 906 from one or more user's set 904 received signals, 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 is received with rectification operationally is associated.Through demodulated symbol by analyzing with and processor 914 that be coupled to memory 916 similar above referring to the described processor of Fig. 8, described memory 916 storages information, the relative look-up table relevant with user gradation, and/or with exercises any other appropriate information relevant of execution this paper elaboration with function.Processor 914 further is coupled to FLO channel 918 assemblies, and described FLO channel 918 assemblies promote to handle 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 new data stream more, described signal can be transferred to user's set 904 so that the indication of discerning 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 provides FLO information and combines with non-linear receivers such as for example ML-MIMO receivers and uses the decoding agreement.

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 to or be different from exemplary base station described below and terminal in fact.

Now, on down link,, launch (TX) data processor 1010 and receive, format, encode, interlock and modulate (or sign map) business datum and modulation symbol (" data symbol ") is provided at access point 1005 places referring to Figure 10.Symbol modulator 1015 receives and deal with data symbol and frequency pilot sign, and symbols streams 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 symbols streams are converted 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 the signal that is received to acceptor unit (RCVR) 1040.Signal that acceptor unit 1040 adjustment (for example, filtering, amplification and down converted) are received and the signal of digitlization through adjusting are to obtain sample.The frequency pilot sign that symbol demodulator 1045 rectification are received 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, the data symbol that received is carried out data demodulation to obtain data symbol estimated value (it is 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 of decoding to recover to be transmitted.The processing of being undertaken by symbol demodulator 1045 and RX data processor 1055 respectively with the processing complementation of being undertaken by Symbol modulator 1015 and TX data processor 1010 at access point 1005 places.

On up link, TX data processor 1060 processing service data and data symbol is provided.Symbol modulator 1065 receives data symbol and data symbol and frequency pilot sign is multiplexed, carries out modulation, and symbols streams 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 to receive by antenna 1025 and handle to obtain sample by acceptor unit 1075.Symbol demodulator 1080 is then handled described sample, and the frequency pilot sign that received 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 (for example, control, coordination, management etc.) in the operation of access point 1005 with terminal 1030 places respectively.Respective processors 1090 can be associated with memory of data unit (not shown) 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 up link and down link respectively.

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 under the situation of whole operation frequency band (may except band edge).Described pilot subband structure is used to needs to obtain the frequency diversity of 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 embodiment, 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 the memory cell and by processor 1090 and 1050 and carry out.

For the software implementation 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 the memory cell and by processor and carry out.Memory cell may be implemented in the processor or processor outside, under one situation of back its can be via this technology in known the whole bag of tricks be coupled to processor communicatedly.

The content of above having described comprises exemplary embodiments.Certainly, can not describe the every kind of combination that envisions of assembly or method for the purpose of describing described embodiment, but one of ordinary skill in the art can recognize that 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 to be used for embodiment or claims, this type of term wishes that mode is (inclusive) that comprises boundary " to comprise " similarly with term, is interpreted into transition vocabulary in use because " comprise " in the claims.

Claims (32)

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

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

According to described time difference information, adjust the phase place of at least one reflector clock; And part is based on the described position of determining at least one receiver through the phase place of adjusting of described reflector clock.

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

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

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

5. method according to claim 1, it further comprises at least two of generations by d _aWith d _bThe timing slip of expression.

6. method according to claim 5, it further comprises determines the first parameter τ ' _a, described τ ' _aBe based on the actual delay between the first reflector A and the described receiver by line of sight propagation component apart from perception; And definite second parameter τ ' _b, described τ ' _bIt is actual delay from the second reflector B to described receiver by the line of sight component perception.

7. method according to claim 6, it further comprises: when postpone extended by tau ' _b-τ ' _aWhen surpassing Cyclic Prefix, manage extra delay d everywhere at described first and second reflector _aWith d _b

8. method according to claim 7, it further comprises handles following equation:

Y (n)=h _a(n) * x _a(n-d _a)+h _b(n) * x _b(n-d _b)+w (n), wherein h _a(n) and x _a(n) be channel and signal about the described first reflector A, * represents the linear convolution computing, and w (n) is the noise that adds at described receiver place.

9. method according to claim 8, it further comprises handles following equation:

Y (n)=h _a(n-d _a) * x (n)+h _b(n-d _b) * x (n)+w (n), wherein the channel delay spread of institute's perception by (τ ' _b-d _b)-(τ ' _a-d _a) provide, and controlled by introduce timing slip at described reflector place.

10. method according to claim 8, it further comprises: when effectively postponing expansion less than Cyclic Prefix, as determining circular convolution in the 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.

11. method according to claim 10, its further comprise delay from the transmission of reflector to satisfy the Cyclic Prefix requirement.

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

13. method according to claim 12, it further comprises the influence by the cyclic shift cancellation physical delay of framing signal, wherein x _{A, p}(n) be from having constant time lag 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.

14. method according to claim 14, it further comprises handles following equation

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

15. method according to claim 1, it further comprises determines that from the offline network source reflector regularly adjusts.

16. method according to claim 15, it further comprises measures described reflector pseudorange regularly.

17. method according to claim 16, it further comprises described pseudorange is relayed to the network year calendar.

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

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

And

Be used for adjusting according to signal phase or signal frequency the device of described reflector in view of described timing difference.

19. system according to claim 18, it further comprises and is used in view of described signal phase or the signal frequency device of determining a position at described receiver place through adjusting.

20. a machine-readable medium stores machine-executable instruction on its its, described machine-executable instruction comprises:

Determine that common clock is with respect to the timing difference between the sub-group of a reflector clock; And

Adjust the phase place or the frequency of at least one reflector clock in view of the definite timing difference of described warp.

21. machine-readable medium according to claim 20, it further comprises based on the described of described reflector determines the location of at least one receiver through adjusting phase place or frequency.

22. machine-readable medium according to claim 20, it further comprises the use triangulation technique and described reflector clock group is determined described location.

23. machine-readable medium according to claim 20, it further comprises determines at least one only forward link parameter.

24. machine-readable medium according to claim 20, it further comprises layer assembly, and described layer assembly has at least one in physical layer, fluid layer, medium access layer and the upper layer.

25. machine-readable medium according to claim 24, described physical layer further comprise in frame field, pilot field, overhead information field, wide-area fields and the local field at least one.

26. machine-readable medium according to claim 25, it further comprises the error correction field.

27. a Wireless Telecom Equipment, it comprises:

Memory, it comprises one in order to determine on the wireless network assembly of base when adjusting between the receiver and reflector; And

Processor, its adjustment signal phase or frequency are so that determine the location of at least one wireless device.

28. equipment according to claim 27, it further comprises an assembly in order to the location of determining described wireless device.

29. equipment according to claim 27, it further comprises one or more assemblies in order to forward link data stream is only decoded.

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

Be used for determining that reflector is organized and the device of the time difference of at least one receiver;

Be used for adjusting the device of described time difference via the signal at child group of place of described reflector; And

Be used for determining the device of the position of described receiver from described signal.

31. equipment according to claim 30, it further comprises the device that produces described signal from least two reflectors of described son group, and described at least two reflectors are through shifting to an earlier date or postponing to solve the timing difference in the wireless network.

32. equipment according to claim 31, it further comprises the device of the linear convolution that is used for calculating channel and the signal through transmitting.

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