CN101444059A - Frequency hopping of pilot tones - Google Patents
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- CN101444059A CN101444059A CNA2007800173598A CN200780017359A CN101444059A CN 101444059 A CN101444059 A CN 101444059A CN A2007800173598 A CNA2007800173598 A CN A2007800173598A CN 200780017359 A CN200780017359 A CN 200780017359A CN 101444059 A CN101444059 A CN 101444059A
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Abstract
Presented are systems and methods for selecting a subband for a pilot tone in a communication system and transmitting and receiving data units that include pilot tones. In one embodiment, a method is presented comprising determining a channel parameter and selecting a subband for the pilot tone based upon the channel parameter and a subband previously assigned to the pilot tone. In another embodiment, the subband is incremented if the channel parameter meets a condition. In another embodiment, a method is present for transmitting multiple data units each having a pilot tone, wherein successively transmitted data units have pilot tones associated with incremented subbands. In another embodiment, the further incremented subband of each further subsequent data unit is the subband of the previously transmitted data unit incremented by a predetermined interval.
Description
Require priority based on 35 U.S.C § 119
The exercise question that present patent application requires to submit on May 15th, 2006 is the provisional application No.60/800 of " Frequency Hopping ofPilot Tones in a MIMO/OFDM System ", 677 priority, this provisional application has transferred the application's assignee, and incorporates its full content clearly into by reference.
Technical field
The disclosure relates to the field of multiplexed communications, and more specifically, relates to the system and method that is used for improving by the frequency that changes the MIMO pilot tone multiple-input and multiple-output (" MIMO ") systematic function.
Background technology
Be desirably in the IEEE 802.11n standard that is used for radio communication finished mid-term in 2007 with the multiplexing OFDM that version adopted (OFDM) technology of integrating with before 802.11 standards of multiple-input and multiple-output (MIMO).Compare with non-multiplex system, mimo system has greatly the advantage of the reliability of the throughput that strengthens and/or increase.
Mimo system is not that single serial data stream is sent to single receive antenna from single transmitting antenna, but data flow is divided into a plurality of single streams, at identical time parallel these a plurality of single streams are modulated and sent in identical frequency channels, each stream sends by the antenna chains of its apart separately.At receiving terminal, one or more MIMO receiver antenna chains receive the linear combination of a plurality of data flow that send, and it is determined by a plurality of paths that each independent transmission can adopt.Subsequently, as hereinafter in greater detail, data flow is separately handled.
Usually, mimo system uses a plurality of transmitting antennas and a plurality of reception antenna to be used for transfer of data.Can be with by N
TIndividual transmitting antenna and N
RThe mimo channel that individual reception antenna constituted resolves into the N corresponding to independent virtual channels
SIndividual eigen mode, wherein, N
S≤ min{N
T, N
R.
In wireless communication system, the data that will send at first are modulated onto on radio frequency (RF) carrier signal, are more suitable in the RF modulation signal that transmits on wireless channel so that generate.For mimo system, can generate nearly N
TIndividual RF modulation signal, and simultaneously from N
TIndividual transmitting antenna sends this N
TIndividual RF modulation signal.The RF modulation signal that is sent can arrive N via the many propagation paths in the wireless channel
RIndividual reception antenna.Can received signal is as follows with the relationship description that sends signal:
S
R=HS
T+ n formula (1)
Wherein, S
RBe corresponding at N
RThe N of the signal that each antenna place in the individual reception antenna receives
RThe complex vector of individual component; S
TBe corresponding at N
TThe N of the signal that each antenna place in the individual transmitting antenna sends
TThe complex vector of individual component; H is N
R* N
TThe complex coefficient that matrix, the representative of its component are described in that each reception antenna place receives from the amplitude of the signal of each transmitting antenna; And n is the vector of representative at the noise of each reception antenna place reception.
Typically, owing to the many factors such as decline, multipath and external disturbance, the characteristic of propagation path changes in time.Therefore, the RF modulation signal that is sent may experience different channel condition (for example, different declines and multipath effect), and may be relevant with different complex gain and signal to noise ratio (snr).In formula (1), these characteristics are encoded in matrix H.
In order to realize high-performance, must characterize radio channel response usually.Can be by coming channel response is described such as the parameter of pectrum noise, signal to noise ratio, bit rate or other performance parameter.For example, as described below, be used for the spatial manipulation of transfer of data in order to carry out to receiver, transmitter may need to know channel response.Similarly, receiver may need to know channel response, so that the signal that is received is carried out the data of spatial manipulation to recover to be sent.
In many wireless communication systems, send the one or more reference signals that are known as pilot tone by transmitter, so that assist receiver to carry out a plurality of functions.Receiver can be used to pilot tone to estimate channel response, and is used for other function and comprises regularly and frequency acquisition, data demodulates etc.Usually, adopt the known parameter of receiver to send one or more pilot tones.By the amplitude of reception pilot tone and phase place and known pilot tone transmission parameter are compared, receiving processor can the calculating channel parameter, allows it that noise in transmission data flow and error are compensated.It at exercise question the U.S. Patent No. 6 of " Uplinkpilot and signaling transmission in wireless communication systems ", 928, the use of pilot signal further has been discussed in 062, has been incorporated into the content of this patent here by reference.
Summary of the invention
In one embodiment, provide the method that is used for increasing in communication system the pilot tone subband, this method comprises the reception designator, and the subband that increases pilot tone according to the designator that is received.In another embodiment, the subband of increase pilot tone comprises according to predetermined space increases subband.In another embodiment, communication system comprises transmitter and receiver, and receives designator by transmitter from receiver.
In another embodiment, the method that is used to send a plurality of data cells is provided, wherein, a plurality of data cells comprise pilot tone respectively, this method comprises transmission first data cell, wherein the pilot tone of first data cell is relevant with first subband, and sends subsequent data unit, and wherein the pilot tone of subsequent data unit is relevant with the subband of increase.In another embodiment, the subband of the increase of subsequent data unit is the subband according to first data cell of predetermined space increase.In another embodiment, method also comprises the more subsequent data unit of continuous transmission, and wherein, the pilot tone of each more subsequent data unit is relevant with the subband of more increases.In another embodiment, the subband of more increases of each more subsequent data unit is the relevant subbands of the data cell with being sent before that increase according to predetermined space.In another embodiment, send a plurality of data cells via radio MIMO/ofdm system.
In another embodiment, the method that is used to send a plurality of data cells is provided, each data cell comprises pilot tone, this method comprises transmission first data cell, wherein the pilot tone of first data cell is distributed to first subband, determine whether to satisfy the pilot frequency hopping condition, and transmission subsequent data unit, if wherein do not satisfy the pilot frequency hopping condition, then the pilot tone of subsequent data unit is relevant with first subband, if and satisfied the pilot frequency hopping condition, then the pilot tone of subsequent data unit would be relevant with the subband of increase.In another embodiment, the subband of increase is the subband according to the pilot tone of the data cell before the predetermined space increase.In another embodiment, determine whether to satisfy the pilot frequency hopping condition and also comprise definite channel parameter.In another embodiment, determine whether to satisfy the pilot frequency hopping condition and comprise also whether definite channel parameter satisfies threshold condition.In another embodiment, a plurality of data cells also comprise sequence identifier respectively.In another embodiment, determining whether to satisfy the pilot frequency hopping condition also comprises from receiver reception designator.
In another embodiment, provided and disposed the device that is used to send a plurality of data cells, this device comprises and is suitable for being coupled to the output of at least one antenna and is coupled to this output and can operates and be used for the transmitter unit that genesis sequence offers the data cell of this output, wherein each data cell comprises pilot tone, and wherein transmitter unit also can be operated and is used for subband that the pilot tone of first data cell is distributed to first subband and the pilot tone of each subsequent data unit distributed to increase.In another embodiment, the subband of the increase of each subsequent data unit is the subband according to the data cell before the fixed intervals increase.In another embodiment, a plurality of data cells also comprise sequence identifier respectively.In another embodiment, a plurality of data cells are respectively packets.In another embodiment, a plurality of data cells are respectively bursts.In another embodiment, a plurality of data cells are respectively protocol Data Units.
In another embodiment, provided and disposed the device that is used to send a plurality of data cells, this device comprises and is suitable for being coupled at least one output of at least one antenna and is coupled to this output and can operates and be used for the transmitter unit that genesis sequence offers the data cell of this output, each data cell comprises pilot tone, wherein transmitter unit also can be operated and be used for the pilot tone of first data cell is distributed to first subband, determine whether to satisfy the pilot frequency hopping condition, if and satisfied the pilot frequency hopping condition, then the pilot tone of each subsequent data unit would be distributed to the subband of increase.In another embodiment, the subband of the increase of each subsequent data unit is the subband according to the data cell before the predetermined space increase.In another embodiment, be used for not satisfying the pilot frequency hopping condition, then the pilot tone of each subsequent data unit distributed to first subband if transmitter unit can be operated.In another embodiment, transmitter unit also can be operated and be used for determining channel parameter.In another embodiment, transmitter unit also can be operated and be used for determining whether channel parameter satisfies threshold condition.
In another embodiment, provide configuration and be used for device that the data cell that is received handled, wherein the data cell that is received comprises sequence identifier and the pilot tone of distributing to subband, this device comprises and is suitable for being coupled at least one input of at least one antenna and is coupled to the receiver unit of this input, this receiver unit configuration is used for from this input receiving data units, the sequence identifier of specified data unit, and determine to distribute to the subband of the pilot tone of received data unit based on the sequence identifier of data cell.In another embodiment, the subband of received data unit determined to distribute to the subband of the pilot tone of institute's receiving element before receiver unit also disposed and is used for distributing to by increase.In another embodiment, according to the interval based on the sequence identifier of data cell increase distribute to before the subband of received data unit.
In another embodiment, provided the device that configuration is used to select to distribute to the subband of pilot tone, this device comprises the module that is used for determining channel parameter, and is used for based on channel parameter and the subband of distributing to pilot tone before selects to distribute to the module of the subband of pilot tone.In another embodiment, device also comprises being used for determining whether channel parameter satisfies the module of threshold condition, and if distribute to the subband of pilot tone before being used for increasing according to predetermined space and be used for that channel parameter does not satisfy threshold condition then the subband selecting to increase as the module that will distribute to the subband of pilot tone.In another embodiment, channel parameter is a signal to noise ratio.In another embodiment, channel parameter is a bit error rate.
In another embodiment, the machine readable media that carries instruction has been described, these instructions are used for realizing a kind of method by one or more processors, and these instructions comprise and are used for determining the instruction of channel parameter and are used for based on channel parameter and the subband of distributing to pilot tone before selects to distribute to the instruction of the subband of pilot tone.
In another embodiment, provided and disposed the device that is used to send a plurality of data cells, wherein a plurality of data cells comprise pilot tone respectively, this device comprises the module that is used to send first data cell, wherein the pilot tone of first data cell is distributed to first subband, be used to determine whether to satisfy the module of pilot frequency hopping condition, and the module that is used to send subsequent data unit, if wherein do not satisfy the pilot frequency hopping condition, then the pilot tone of subsequent data unit is relevant with first subband, if and satisfied the pilot frequency hopping condition, then the pilot tone of subsequent data unit would be relevant with the subband of increase.In another embodiment, the subband of increase is the subband according to the data cell before the predetermined space increase.In another embodiment, be used to determine whether that the module that satisfies the pilot frequency hopping condition also comprises the module that is used for determining channel parameter.In another embodiment, the module that is used to determine whether to satisfy the pilot frequency hopping condition also comprises and is used for determining whether channel parameter satisfies the module of threshold condition.In another embodiment, be used to determine whether that the module that satisfies the pilot frequency hopping condition also comprises the module that is used for receiving from receiver designator.
In another embodiment, provided the machine readable media that carries instruction, these instructions are used for realizing a kind of method by one or more processors, these instructions comprise the instruction that is used to send first data cell that comprises the pilot tone of distributing to first subband, be used to determine whether to satisfy the instruction of pilot frequency hopping condition, and the instruction that is used to send the subsequent data unit that comprises second pilot tone, if wherein do not satisfy the pilot frequency hopping condition, then second pilot tone is relevant with first subband, if and satisfied the pilot frequency hopping condition, then second pilot tone would be relevant with the subband of increase.
In another embodiment, provide configuration and be used for device that the data cell that is received handled, the data cell that is received comprises sequence identifier and the pilot tone relevant with subband, this device comprises the module of the sequence identifier that is used for the specified data unit, and the module that is used for determining based on the sequence identifier of data cell the subband relevant with the pilot tone of received data unit.In another embodiment, the module of subband that is used to determine to distribute to the pilot tone of received data unit comprises also and is used for the module that increases at interval with the subband that the received data unit is relevant before according to one that wherein this interval is based on the sequence identifier of data cell.In another embodiment, provided the machine readable media that carries instruction, these instructions are used to realize a kind of method, these instructions comprise the instruction of the sequence identifier that is used for the specified data unit, and the instruction that is used for determining based on the sequence identifier of data cell the subband relevant with the pilot tone of received data unit.
Description of drawings
With reference to the accompanying drawings, with the exemplary embodiment of understanding according to system and method for the present disclosure, accompanying drawing is not intended to limit the scope of the present disclosure.In the accompanying drawings, be illustrated in each the identical or approximately uniform assembly shown in the different graphic by identical designator.For purpose clearly, in each figure, each assembly is carried out mark.In the accompanying drawings:
By the detailed description that provides below in conjunction with accompanying drawing, it is clearer that feature of the present disclosure and characteristic will become, and in the accompanying drawings, identical reference symbol is consistent in full.
Fig. 1 is the schematic diagram of wireless network;
Fig. 2 is the block diagram of dispatching station and receiving station;
Fig. 3 is the schematically showing of pilot tone hop on subband;
Fig. 4 is used to the schematically showing of embodiment that pilot tone is selected the device of subband;
Fig. 5 is the schematically showing of embodiment that is used to send the device of the data cell that comprises pilot tone;
Fig. 6 A is the schematically showing of embodiment that is used to estimate whether to exist the device of pilot frequency hopping condition;
Fig. 6 B is the schematically showing of another embodiment that is used to estimate whether to exist the device of pilot frequency hopping condition;
Fig. 7 is the schematically showing of embodiment of device of subband that is used to determine to distribute to the pilot tone of received data unit.
Embodiment
Here using word " exemplary " meaning is " example or example as an example, ".Will not be described as any embodiment of " exemplary " or design here is interpreted as than other embodiment or designs preferred or favourable.
The effectiveness of pilot tone is subjected to noise and interference-limited.These noises and interference pass through to introduce the function of reference that pseudo-component (spurious component) can reduce pilot tone in the amplitude of reception pilot tone and phase place.For integrality, the technology of the increment frequency hopping (incremental frequency hopping) that is used for pilot tone has been described to antinoise and interference maintenance pilot tone.Use method of the present disclosure in the OFDM/MIMO system, if begin to reduce systematic function from the noise or the interference of other system, pilot tone can be carried out frequency hopping on frequency band so.
Fig. 1 shows the example wireless network 100 with access point 110 and one or more user terminal 120.Usually, access point 110 is the fixed stations that communicate with user terminal, for example base station or BTS under CROS environment (BTS).User terminal 120 can be fixing or travelling carriage (STA), wireless device or any other subscriber equipment (UE).User terminal 120 can communicate with access point 110.Alternatively, user terminal 120 can also carry out end to end communication with another user terminal 120.In the exemplary embodiment, access point 110 is radio network wire concentrators, and user terminal 120 is the one or more computers that assembled wireless network adapter.In optional exemplary embodiment, access point 110 is cellular communication stations, and user terminal 120 is one or more cell phones, beep-pager or other communication equipment.Those skilled in the art will recognize as shown in Figure 1 can general expression other system.
Each user terminal 120 in the wireless network 100 and access point 110 comprise dispatching station or receiving station or these two.Fig. 2 shows the block diagram of exemplary dispatching station 210 and exemplary receiving station 250.In the embodiment shown in Figure 2, dispatching station 210 assembling individual antennas 234, and a plurality of (for example, the N of receiving station's 250 assemblings
R=2) antenna 252a-r.Usually, dispatching station 210 and receiving station 250 can have a plurality of antennas; In mimo system, typically, dispatching station 210 and receiving station 250 all have a plurality of antennas.
Refer again to Fig. 2, at dispatching station 210 places, 220 pairs of initial data of source encoder are encoded such as speech data, video data or any data that other can send on wireless network.Typically, coding is based on any scheme in the plurality of information resources encoding scheme known in the art, for example, is used for enhanced variable rate encoding and decoding (EVRC) encoder of voice, the H.324 encoder that is used for video and many other known coded schemes.The source encoding Scheme Selection depends on the terminal applies of wireless network.
At receiving station 250 places, N
R Individual antenna 252a to 252r receives (perhaps the signal that is sent, if transmitter unit 232 comprises a plurality of transmitting antennas and sends multiplexed signals that antenna 252a to 252r receives the linear combination of the signal that sends by each transmitting antenna separately so).Each antenna 252 offers separately receiver unit (RCVR) 254 with the signal that is received.Each receiver unit 254 is handled the signal of its reception.In the exemplary embodiment, receiver unit 254 is handled, input sample stream is offered receiving processor 260 signal via digital sample respectively.Receiving processor 260 in the mode of the processing complementation performed with sending processor 230 to handling from the input sample of all R receiver unit 254a to 254r, and dateout is provided, and it is the statistical estimate of the business datum content that sent by dispatching station 210.Source decoder 270 to be handling dateout with the mode of the performed processing complementation of source encoder 220, and provides decoded data as output, is used for further being used or being handled by other assembly.
In the exemplary embodiment, controller 240 and 280 is indicated the operation at the processing unit at dispatching station 210 and receiving station 250 places respectively.Dispatching station 210 and receiving station 250 can also comprise memory cell 242 and 282, and it is stored respectively by controller 240 and 280 employed data and/or program codes.
Signal processing in OFDM (OFDM) system
Use the OFDM scheme effectively the whole system bandwidth division to be become many (N
F) individual orthogonal subbands.Sometimes, these orthogonal subbands are called tone, frequency range or frequency subchannels.Adopt OFDM, each subband is relevant with separately subcarrier, can modulate data on these subcarriers.For the MIMO-OFDM system, each subband can be relevant with many eigen modes, and each eigen mode of each subband can be considered as independently transmission channel.
As previously mentioned, the MIMO-OFDM system uses pilot tone to be used for channel response estimation, timing and frequency acquisition, data demodulates or other function.In exemplary MIMO-OFDM system, that these pilot tone structures are as follows.
The MIMO-OFDM system bandwidth is divided into N
FIndividual orthogonal subbands.Usually, the number of orthogonal subbands depends on the number at the antenna that transmits and receives end of mimo system.In the exemplary embodiment, N
F=64, but in certain embodiments, generally can be easy to described technology is applied to the mimo system of operating with orthogonal subbands and other OFDM sub band structure of any number.
On the subband of predetermined number, send pilot tone.Can select the number of OFDM subband and at interval, so that optimization is improved channel estimating and increased expense or cause the balance of effective bandwidth between losing because some subband of reservation is used for pilot tone.For example, at N
FIn=64 the exemplary embodiment, can use 4 pilot tones, not sacrifice too many data bandwidth to provide enough data to be used for the channel performance estimation.
Many factors may be facilitated the phase place rotation of OFDM symbol, for example phase noise of the sampling time of symbol or local oscillator.This phase place rotation can cause error in received signal.When using pilot tone, can estimate these phase place rotations according to the pilot tone of utilizing known parameters to send at the Processing Algorithm or the circuit at receiver place, and correspondingly data tones be proofreaied and correct.Therefore, extremely important to accurately and accurately measuring of the phase information in the pilot tone for the whole system performance.Owing to may lose Phase Tracking, so may obviously reduce systematic function to any interference of pilot tone (particularly introducing the interference that does not have the phase deviation that also in data tones, occurs) to the data tone.When pseudo-phase deviation (spurious phase shift) occurring in pilot tone, receiver is handled may carry out exaggerated correction to data tones, perhaps non-existent phase deviation in data tones is proofreaied and correct.
In order to solve the narrowband interference problems that phase error may be introduced pilot tone, embodiment of the present disclosure provides the technology that is used for the pilot tones frequency hopping.In OFDM-MIMO system with disclosed technology here, disturb or the information source of any other degradation channel response when reducing systematic function when observing, can be with pilot tone hop different position in the frequency band.
Fig. 3 is schematically illustrated in has N
FPilot tone hop in the exemplary OFDM-MIMO system of individual subband.In Fig. 3, represent and the corresponding subcarrier of each subband by the vertical line in the channel spectrum that schematically shows.Can pass through from 1 to N
FIndex k mention these subcarriers.In any preset time, keep some subbands as pilot tone, can modulate with carrying the subcarrier in other subband simultaneously and send data or other system information.At certain time t=t
0, in exemplary embodiment shown in Figure 3, subband k=1 and each the 8th subband thereafter are appointed as pilot tone, by a dotted line and the alphabetical P on those subbands represent.Should be appreciated that this only is exemplary, and technology as described herein can be applied to be positioned at channel Anywhere, have a pilot tone any desired interval, arbitrary number.
When interference in the pilot tone and/or phase noise EVAC (Evacuation Network Computer Model) performance, system can carry out " frequency hopping " to pilot tone, and the role of pilot tone is redistributed to the subband different with the subband of those initial allocation.(following the trigger condition that may cause system that pilot tone is carried out frequency hopping is discussed.) in Fig. 3, for example, at time t=t
1, system has promoted a subband with pilot tone.Therefore, in the embodiment shown in fig. 3, at t=t
1The time, pilot tone is assigned to subband k=2,10 etc.Similarly, as shown in Figure 3, if system promotes pilot tone once more, so at certain time t=t after a while
2, pilot tone can be assigned to subband k=3,11 etc.In the exemplary embodiment, if frequency subband k=N that will be the highest
FBe appointed as pilot tone, when system hops or lifting pilot tone, distribute " circulation " lowermost portion to channel so, that is, k=1 is appointed as pilot tone with subband.
In one embodiment, when channel condition drops to threshold value when following, just trigger pilot tone hop.For example, threshold condition can be that bit rate drops to below certain threshold level, phase noise is increased to the threshold value that threshold level is above, signal to noise ratio drops to below the threshold level, bit error rate is increased in any other channel parameter that threshold level is above or system monitored and reduces.Can comprise that by other channel parameter of example system monitoring correlation, channel coherence time, frequency and rms postpone expansion.Can estimate threshold condition by processing that exists at transmitting terminal or the processing that exists at the receiver place.In one embodiment, at receiver end pectrum noise, signal to noise ratio and/or bit rate are monitored; Can monitor other parameter at transmitter terminal.Estimating that at receiver end receiver just sends to transmitter with sign, signal or other designator when detecting threshold condition among the embodiment of threshold condition.In these embodiments, transmitter is programmed,, and begin to increase pilot tone to respond to receiving designator so that designator is interpreted as beginning to carry out the request of pilot tone hop.
When detecting positive threshold condition, then transmitter is by certain fixed number N
IIndividual subband increases pilot tone.In the embodiment shown in fig. 3, N
I=1, but other N can be used
IValue.In one embodiment, when detecting threshold condition, pilot tone can (be pressed N
IIndividual intersubband every) increase once.In another embodiment, system can be according to N
IIndividual subband repeatedly increases pilot tone, detection threshold condition when at every turn increasing, and when no longer satisfying threshold condition, promptly when one or more channel parameters of monitoring return its desired scope, stop to increase pilot tone.In another embodiment, when detecting threshold condition, can repeat to increase pilot tone, when pilot tone increases the high-frequency end points that surpasses channel, pilot tone be looped back k=1 for each continuous grouping or the burst that transmitter sends.At last, in another embodiment, can programme, change pilot tone so that always be independent of any threshold condition to system.For example, can programme to this system, so that utilize the subband k=1 that is assigned as pilot tone to initiate transmission, and for grouping or the burst that each sent pilot tone is increased a subband subsequently, when pilot tone increases the high-frequency end points that surpasses channel, loop back k=1.The tone frequency hopping can continue the scheduled time or predetermined number of frames, perhaps when can stop the tone frequency hopping when transmitter or receiver place no longer detect threshold condition.Alternatively, when when transmitter or receiver place detect different threshold conditions, stopping frequency hopping.
In the exemplary embodiment, when definite pilot tone should be carried out frequency hopping, the N that all is shifted of all tones in the OFDM symbol
IIndividual subband.Like this, for example (refer again to Fig. 3), at t=t
0The time, subband k=1 appointment is used for pilot tone, and subband k=2-8 carrying data are (and for subband k=9 to k=N
FBe similar).After pilot tone hop (according to N
I=1), at t=t
1The time, subband k=2 specified be used for pilot tone, and in subband k=3-9 carrying with before corresponding data of data among the subband k=2-8; And for subband k=9 to k=N
FBe similar; In subband k=1 the carrying with before subband k=N
FIn the corresponding data of data.In other words, when the tone frequency hopping, each tone is pushed ahead N
IIndividual subband, and will jump out the outer tone " circulation " of channel by increase and return the subband that takies first tone.Alternatively, can press N by carrying out the tone frequency hopping in the other direction
IReduce each tone, and will lower tone loop back the higher-end of frequency spectrum.
In order correctly to handle the signal that is received, in certain embodiments, which subband receiver can determine for grouping, burst or protocol Data Unit (PDU) that each received is that pilot tone and which subband are data tones.Therefore, in one embodiment, transmitter is to each grouping, burst or PDU flag sequence identifier, such as the unique identifier of sequence number or other position of positioning packet in the transmission packet sequence.Receiver can use this identifier to determine which allocation of subbands is to the pilot tone that is used for this grouping, burst or PDU.For example, if receiver knows that pilot tone hop is from transmission bearer sequence number N
HGrouping begin, and know in each follow-up grouping that pilot tone is pressed NI subband and promoted, then receive carrying sequence number N when receiver
HDuring the packet of+p, receiver can be by with (pN
I) mod (N
F) add each index of original sub-band to, calculate index with the corresponding subband of pilot tone of this grouping.This step of calculating according to correct number promotes pilot tone, and surpasses last subband k=N when pilot tone promotes
FThe time, pilot tone is looped back subband k=1.
Correctly determine pilot tone for the sequence number according to packet, burst or PDU, in certain embodiments, receiver is known the sequence number of beginning pilot frequency hopping.Send instruction so that among the embodiment of beginning pilot frequency hopping, receiver can be stored its packet number that sends this instruction at receiver to transmitter.Determine when that at transmitter transmitter can send signal to receiver among the embodiment of beginning pilot frequency hopping, the sequence number of indication beginning pilot frequency hopping.
In optional embodiment, grouping, burst or PDU self can directly comprise the index of subband or frequency are carried out information encoded, makes receiver to read these information simply from transmission.
The exemplary embodiment that configuration is used to realize the device of certain methods disclosed herein has been shown in Fig. 4-6.As further described below, these equipment and/or its assembly can make up with hardware, software or its respectively and realize.
Figure 4 illustrates the exemplary embodiment of device that configuration is used to select to distribute to the subband of pilot tone.Device 402 comprises the module 408 that is used for determining such as channel parameter or any other channel parameter of bit rate, phase noise, signal to noise ratio.Channel parameter determination module 408 can receive input 404, for example from the signal of receiver, wherein handles so that determine the value of one or more channel parameters importing 404.In the exemplary embodiment, device also comprises subband selection module 412, and it uses channel parameter to be the pilot tone allocated subbands, for example, so that distribute to the subband of pilot tone before determining whether increase.Subband selects module 412 can comprise condition estimation module 410, and it determines whether (being determined by module 408) channel parameter satisfies aforesaid pilot frequency hopping condition.Subsequently, subband increases the output of module 414 based on condition estimation module 410, if necessary then increases subband.In the exemplary embodiment, the output 418 of device 402 is signals that indication will be distributed to the subband of pilot tone.This signal 418 can be sent to subsequently, for example, generate the processor of the data cell that is used to transmit.
Fig. 5 shows the exemplary embodiment of the device that is used to send a plurality of data cells, and each data cell comprises pilot tone.Device 502 comprises sending module 504.Sending module 504 can receive input 508, and it is included in the data cell that is used for transmitting and carries out information encoded.Sending module 504 is also from as above selecting module 412 to receive input 510 in conjunction with the described subband of Fig. 4.Which subband input 510 notice sending modules use as pilot tone in the data cell that will send.Therefore, the output 512 of sending module 504 comprises that carrying is from the data cell of the coded message of input 508 and in the pilot tone of being selected by subband in the module 412 determined subbands.
In the exemplary embodiment of the device 502 that is used for sending data cell, as above described in conjunction with Fig. 4, subband selects module 412 to comprise that condition estimation module 410 and subband increase module 414.Subband increase module 414 if necessary then increases subband according to the output 514 of condition estimation module 410.For example, if the pilot frequency hopping condition is satisfied in the output of condition estimation module 410 514 indications, subband increases module 414 and increases subband so; On the other hand, if the pilot frequency hopping condition is not satisfied in the output of condition estimation module 410 514 indication, subband selects module 412 just to distribute and the identical subband of subband that distributes for the pilot tone of the data cell that sent before so.
The exemplary embodiment of condition estimation module 410 has been shown in Fig. 6 A and Fig. 6 B.In the embodiment shown in Fig. 6 A, condition estimation module 410 (via channel parameter determination module 604) is determined channel parameter, and (via threshold value estimation module 608) determines whether channel parameter satisfies threshold condition subsequently.As shown in Figure 5, the output 514 with the condition estimation module is sent to subband increase module 414.In optional embodiment, channel parameter determination module 604 is independent modules, rather than the assembly of condition estimation module 410.In this embodiment, channel parameter determination module 604 sends channel parameter to condition estimation module 410 and handles.
At last, in the embodiment shown in Fig. 6 B, condition estimation module 410 comprises the designator receiver module that designator 612 is received, and designator 612 indicates whether increase subband.
Fig. 7 shows the embodiment that is used for device 702 that the data cell that is received is handled, and wherein data cell has sequence identifier and the pilot tone relevant with subband.Installing 702 pairs of inputs 704 that comprise data cell receives.708 pairs of inputs 704 of sequence identifier determination module are handled, so that determine sequence identifier.The subband determination module is from sequence identifier determination module 708 fetch squence identifiers, and as previously mentioned, uses this sequence identifier to determine the pilot tone of received data unit.For example, in the exemplary embodiment, subband determination module 712 is determined subband by increasing according to the interval based on the sequence identifier of received data unit with the subband that the received data unit is relevant before.The output 714 of device 702 can be the signal of indicating the subband of the pilot tone in the just processed data cell.
Can be in mimo wireless communication system and adopt in the wireless or non-wireless any communication system of one or more pilot tones and realize technology as described herein.Can realize technology as described herein in many ways, these modes comprise that hardware is realized, software is realized or its combination.Realize for hardware, be used for can realizing in one or more the following units the processing unit that the data that send at the dispatching station place and/or receive at the receiving station place are handled: application-specific integrated circuit (ASIC) (ASIC), digital signal processor (DSP), digital signal processor spare (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, electronic device, other is designed for and realizes electronic unit or its combination of institute's representation function here.Comprise among the embodiment of a plurality of processors in transmission and receiving station, can share hardware cell at the processor at each place, station.
Realize for software, can utilize the software module (for example: program, function etc.) of carrying out function as described herein to realize that data send and reception technique.Software code can be stored in the memory cell (for example, the memory cell 242 or 282 among Fig. 2), and carry out this software code by processor (for example, controller 240 or 280).Can be in processor inside or the outside memory cell of realizing of processor.
In one or more exemplary embodiments, can in hardware, software, firmware or its combination in any, realize function as described herein.If in software, realize, function can sent on the computer-readable medium or on computer-readable medium as one or more instructions or code storage.Computer-readable medium comprises computer-readable storage medium and communication media, and this communication media includes any medium that helps computer program is sent to from a place another place.Storage medium can be any usable medium that computer can be visited.By way of example rather than the mode of restriction, this computer-readable medium can comprise RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage apparatus or can be used to carry or any other medium store instruction or data structure form and required program code can be by computer access.Equally, can suitably call computer-readable medium to any connection.For example, if use coaxial cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line (DSL) or send software from network address, server or other remote source, in the definition of medium, comprise coaxial cable, fiber optic cables, twisted-pair feeder, DSL so or such as the wireless technology of infrared ray, radio and microwave such as the wireless technology of infrared ray, radio and microwave.Disk as used herein and CD comprise compact disk (CD), laser disk, CD, digital video disk (DVD), floppy disk and Blu-ray disc, and wherein disk carries out the magnetic reproduction to data usually, and cd-rom using laser reproduces data.Also combinations thereof should be included in the scope of computer-readable medium.
Provide the above stated specification of disclosed embodiment, so that make those skilled in the art can both realize or use the disclosure.The various modifications of these embodiment will become apparent to those skilled in the art that and not depart under the application's the situation of spirit and scope, the General Principle that defines can be applied to other embodiment here.Therefore, the disclosure is not intended to limit to the embodiment shown in being formed on here, and should give and principle disclosed herein and the corresponding to maximum magnitude of novel features.
Claims (42)
1, a kind of method that is used for increasing the subband of pilot tone in communication system, described method comprises:
Receive designator; And
According to the reception of designator, increase the subband of described pilot tone.
2, the subband that the method for claim 1, wherein increases described pilot tone comprises according to predetermined space increases described subband.
3, the method for claim 1, wherein described communication system comprises transmitter and receiver, and wherein, receives described designator by described transmitter from described receiver.
4, a kind of method that is used to send a plurality of data cells, wherein, described a plurality of data cells comprise pilot tone respectively, described method comprises:
Send first data cell, wherein, the pilot tone of described first data cell is relevant with first subband; And
Send subsequent data unit, wherein, the pilot tone of described subsequent data unit is relevant with the subband that is increased.
5, method as claimed in claim 4, wherein, the subband that is increased of described subsequent data unit is according to the subband of predetermined space increase, described first data cell.
6, method as claimed in claim 4 also comprises:
Send more subsequent data unit continuously, wherein, the pilot tone of each more subsequent data unit relevant with the subbands that increase more.
7, method as claimed in claim 6, wherein, the subbands that increase of each more subsequent data unit are according to predetermined space subband that increase, relevant with the data cell that is sent before more.
8, method as claimed in claim 4 wherein, sends a plurality of data cells via radio MIMO/ofdm system.
9, a kind of method that is used to send a plurality of data cells, wherein, described a plurality of data cells comprise pilot tone respectively, described method comprises:
Send first data cell, wherein, the pilot tone of described first data cell is distributed to first subband;
Determine whether to satisfy the pilot frequency hopping condition; And
Send subsequent data unit, wherein,
If do not satisfy described pilot frequency hopping condition, the pilot tone of described subsequent data unit is relevant with described first subband; And
If satisfy described pilot frequency hopping condition, the pilot tone of described subsequent data unit is relevant with the subband that is increased.
10, method as claimed in claim 9, wherein, the subband of described increase according to predetermined space increase, the subband of the pilot tone of before data cell.
11, method as claimed in claim 9 wherein, determines whether to satisfy described pilot frequency hopping condition and also comprises definite channel parameter.
12, method as claimed in claim 11 wherein, determines whether to satisfy described pilot frequency hopping condition and comprises also whether definite described channel parameter satisfies threshold condition.
13, method as claimed in claim 12, wherein, described a plurality of data cells also comprise sequence identifier respectively.
14, method as claimed in claim 12 wherein, determines whether to satisfy described pilot frequency hopping condition and also comprises from receiver reception designator.
15, a kind of device that is used to send a plurality of data cells, described device comprises:
Output is suitable for being coupled at least one antenna; And
Transmitter unit is coupled to described output and can be used for the data cell that genesis sequence offers described output, and wherein, described data cell comprises pilot tone respectively; And
Wherein, described transmitter unit also is used for the pilot tone of described first data cell is distributed to first subband, and the pilot tone of each subsequent data unit is distributed to the subband that is increased.
16, device as claimed in claim 15, wherein, the subband of the described increase of each subsequent data unit according to fixed intervals increase, the subband of before data cell.
17, device as claimed in claim 15, wherein, described a plurality of data cells also comprise sequence identifier respectively.
18, device as claimed in claim 15, wherein, described a plurality of data cells are respectively packets.
19, device as claimed in claim 15, wherein, described a plurality of data cells are respectively bursts.
20, device as claimed in claim 15, wherein, described a plurality of data cells are respectively protocol Data Units.
21, a kind of device that is used to send a plurality of data cells, described device comprises:
At least one output is suitable for being coupled at least one antenna; And
Transmitter unit is coupled to described output and is used for the data cell that genesis sequence offers described output, and wherein, described data cell comprises pilot tone respectively;
Wherein, described transmitter unit also is used for:
The pilot tone of described first data cell is distributed to first subband;
Determine whether to satisfy the pilot frequency hopping condition; And
If satisfy described pilot frequency hopping condition, then the pilot tone of each follow-up data distributed to the subband that is increased.
22, device as claimed in claim 21, wherein, the subband of the described increase of each subsequent data unit according to predetermined space increase, the subband of before data cell.
23, device as claimed in claim 21 wherein, if described transmitter unit is used for not satisfying described pilot frequency hopping condition, is then distributed to the pilot tone of each subsequent data unit described first subband.
24, device as claimed in claim 21, wherein, described transmitter unit also is used for determining channel parameter.
25, device as claimed in claim 24, wherein, described transmitter unit is used for also determining whether described channel parameter satisfies threshold condition.
26, a kind of device that is used to handle the received data unit, described received data unit comprise sequence identifier and distribute to the pilot tone of subband that described device comprises:
At least one input is suitable for being coupled at least one antenna; And
Receiver unit is coupled to described input, and described receiver unit is used for:
Receive described data cell from described input;
Determine the described sequence identifier of described data cell; And
Based on the described sequence identifier of described data cell, determine to distribute to the subband of the pilot tone of described received data unit.
27, device as claimed in claim 26, wherein, the subband of received data unit determined to distribute to the subband of the pilot tone of described institute receiving element before described receiver unit also was used for distributing to by increase.
28, device as claimed in claim 27 wherein, increases the subband of distributing to the received data unit before described according to the interval based on the described sequence identifier of described data cell.
29, a kind of device that is used to select to distribute to the subband of pilot tone, described device comprises:
Be used for determining the module of channel parameter; And
Be used for selecting to distribute to the module of the subband of described pilot tone based on described channel parameter and the subband of distributing to pilot tone before.
30, device as claimed in claim 29 also comprises:
Be used for determining whether described channel parameter satisfies the module of threshold condition; And
Distribute to the subband of described pilot tone before being used for increasing according to predetermined space and be used for that if described channel parameter does not satisfy described threshold condition the subband of selecting described increase as the module that will distribute to the subband of described pilot tone.
31, device as claimed in claim 29, wherein, described channel parameter is a signal to noise ratio.
32, device as claimed in claim 31, wherein, described channel parameter is a bit error rate.
33, a kind of carrying is used for being realized by one or more processors a kind of machine readable media of instruction of method, and described instruction comprises:
Be used for determining the instruction of channel parameter; And
Be used for selecting to distribute to the instruction of the subband of described pilot tone based on described channel parameter and the subband of distributing to pilot tone before.
34, a kind of device that is used to send a plurality of data cells, wherein, described a plurality of data cells comprise pilot tone respectively, described device comprises:
Be used to send the module of first data cell, wherein, the pilot tone of described first data cell distributed to first subband;
Be used to determine whether to satisfy the module of pilot frequency hopping condition; And
Be used to send the module of subsequent data unit, wherein,
If do not satisfy described pilot frequency hopping condition, the pilot tone of described subsequent data unit is relevant with described first subband; And
If satisfy described pilot frequency hopping condition, the pilot tone of described subsequent data unit is relevant with the subband that is increased.
35, device as claimed in claim 34, wherein, the subband of described increase according to predetermined space increase, the subband of before data cell.
36, device as claimed in claim 34 wherein, describedly is used to determine whether that the module that satisfies the pilot frequency hopping condition also comprises the module that is used for determining channel parameter.
37, device as claimed in claim 36, wherein, the described module that is used to determine whether to satisfy the pilot frequency hopping condition also comprises and is used for determining whether described channel parameter satisfies the module of threshold condition.
38, device as claimed in claim 36 wherein, describedly is used to determine whether that the module that satisfies the pilot frequency hopping condition also comprises the module that is used for receiving from receiver designator.
39, a kind of carrying is used for being realized by one or more processors a kind of machine readable media of instruction of method, and described instruction comprises:
Be used to send the instruction of first data cell, described first data cell comprises the pilot tone of distributing to first subband;
Be used to determine whether to satisfy the instruction of pilot frequency hopping condition; And
Be used to send the instruction of subsequent data unit, described subsequent data unit comprises second pilot tone, wherein,
If do not satisfy described pilot frequency hopping condition, described second pilot tone is relevant with described first subband; And
If satisfy described pilot frequency hopping condition, described second pilot tone is relevant with the subband that is increased.
40, a kind of device that is used to handle the received data unit, described received data unit comprises sequence identifier and the pilot tone relevant with subband, described device comprises:
The module that is used for the described sequence identifier of definite described received data unit; And
Be used for determining the module of the subband relevant with the pilot tone of described received data unit based on the described sequence identifier of described data cell.
41, system as claimed in claim 40, wherein, the module of the subband of the described pilot tone that is used to determine to distribute to described received data unit also comprises the module that is used for according to increasing at interval with the subband that the received data unit is relevant before, wherein, described interval is based on the described sequence identifier of described received data unit.
42, a kind of carrying is used for being realized by one or more processors a kind of machine readable media of instruction of method, and described instruction comprises:
Be used to determine to have the instruction of sequence identifier of the data cell of pilot tone; And
Be used for determining the instruction of the subband relevant with the pilot tone of described data cell based on the described sequence identifier of described data cell.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80067706P | 2006-05-15 | 2006-05-15 | |
| US60/800,677 | 2006-05-15 | ||
| US11/746,795 | 2007-05-10 |
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| Publication Number | Publication Date |
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| CN101444059A true CN101444059A (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800173598A Pending CN101444059A (en) | 2006-05-15 | 2007-05-14 | Frequency hopping of pilot tones |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104823456A (en) * | 2012-09-04 | 2015-08-05 | 西格福克斯公司 | Methods for transmitting and receiving data in digital telecommunications system |
| CN110121209A (en) * | 2018-02-05 | 2019-08-13 | 北京佰才邦技术有限公司 | A kind of transmission method of pilot frequency information, the network equipment and terminal |
-
2007
- 2007-05-14 CN CNA2007800173598A patent/CN101444059A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104823456A (en) * | 2012-09-04 | 2015-08-05 | 西格福克斯公司 | Methods for transmitting and receiving data in digital telecommunications system |
| CN104823456B (en) * | 2012-09-04 | 2018-06-01 | 西格福克斯公司 | The method for being transmitted in digital communication system and receiving data |
| CN110121209A (en) * | 2018-02-05 | 2019-08-13 | 北京佰才邦技术有限公司 | A kind of transmission method of pilot frequency information, the network equipment and terminal |
| CN110121209B (en) * | 2018-02-05 | 2023-04-07 | 北京佰才邦技术股份有限公司 | Pilot frequency information transmission method, network equipment and terminal |
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