CN101595698A - The spatial pilot structure that is used for multi-antenna wireless communication - Google Patents
The spatial pilot structure that is used for multi-antenna wireless communication Download PDFInfo
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- CN101595698A CN101595698A CNA2007800062519A CN200780006251A CN101595698A CN 101595698 A CN101595698 A CN 101595698A CN A2007800062519 A CNA2007800062519 A CN A2007800062519A CN 200780006251 A CN200780006251 A CN 200780006251A CN 101595698 A CN101595698 A CN 101595698A
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Abstract
In many antennas multilayer transport communication system, support the spatial pilot of MIMO receiver.Be recycled and reused for the ground floor pilot tone of individual layer transmission on the subband in an OFDM symbol, and in the 2nd contiguous OFDM symbol, repeat the ground floor pilot tone with OFDM symbol phase deviation ground.Can also send the additional transfer layer that comprises independent pilot tone respectively, wherein, in first symbol, generate and repeat this independent pilot tone, and in the second contiguous symbol, with this independent pilot tone phase deviation repeat this independent pilot tone.Then, send and receive the first and second OFDM symbols, so that characterize receive channel.
Description
Require priority based on 35U.S.C. § 119
That present patent application requires is all that submit on February 21st, 2006, be called the provisional application No.60/775 of " WirelessCommunication System and Method ", 443 and name be called the provisional application No.60/775 of " DOCommunication System and Method ", 693 priority, described provisional application is transferred to the application's assignee, incorporates it into this paper clearly by reference.
Technical field
The communication of disclosure file relate generally to more specifically, relates to the transmission technology that is used for wireless communication system.
Background technology
Wireless communication system is disposed widely is used to provide various communication services, for example voice, video packet data, message, broadcasting etc.These systems can support a plurality of users' multi-address system by sharing free system resources.The example of this multi-address system comprises: code division multiple access (CDMA) system, time division multiple access (TDMA) system, frequency division multiple access (FDMA) system, quadrature FDMA (OFDMA) system and Single Carrier Frequency Division Multiple Access (SC-FDMA) system.
Multi-address system can utilize one or more multiplexing schemes, for example code division multiplexing (CDM), Time Division Multiplexing etc.This system can be disposed, and can serve existing terminal.May expect to improve systematic function, keep backwards compatibility simultaneously existing terminal.For example, may expect to adopt for example space technology of multiple-input and multiple-output (MIMO) and space division multiple access (SDMA), to use the additional space dimension that a plurality of antenna was provided to improve throughput and/or reliability by utilizing.
Multiple antenna communication is supported multiple-input and multiple-output (MIMO) transmission from a plurality of (T) transmitting antenna to a plurality of (R) reception antenna.The mimo channel that is formed by T transmitting antenna and R reception antenna is made of S space channel, S≤min{T wherein, R}.S space channel can be used for the parallel data that send, to reach higher total throughout and/or redundant to reach higher reliability.
Usually, need be at the receiver place to the accurate estimation of the wireless channel between the transmitter and receiver, so that regain the data that send via wireless channel.Typically, by sending pilot tone from transmitter and measuring this pilot tone at receiver and carry out channel estimating.Pilot tone is to be made of the known in advance symbol of transmitter and receiver.Therefore, receiver can be estimated channel response based on symbol that is received and known symbol.
Multiaerial system is supported MIMO receiver (it is the receiver that is equipped with a plurality of antennas).Typically, the MIMO receiver needs different channel estimating, thereby pilot tone is had different demands, and is as described below.Because in multiaerial system, pilot transmission shows as expense, so expectation reduces pilot transmission as much as possible.Yet pilot transmission should make the MIMO receiver can obtain to have the channel estimating of enough quality.
Therefore, need to send efficiently the transmission technology of pilot tone in the art in multiaerial system, it can the support space technology, keeps the backwards compatibility to existing terminal simultaneously.
Summary of the invention
Here described and be used for sending spatial pilot so that support the technology of the MIMO receiver of many antennas multilayer transport communication system.According to one embodiment of present invention, a kind of method that sends pilot tone in wireless communication system has been described.This method comprises that generation is used for the ground floor pilot tone of individual layer transmission.Repeat the ground floor pilot tone on the subband in an OFDM symbol, and in the 2nd adjacent OFDM symbol, repeat the ground floor pilot tone with OFDM symbol phase deviation ground.Send the first and second OFDM symbols then.
According to another embodiment of the invention, a kind of device that is used in the wireless communication system has been described.This device comprises the pilot tone maker, is used for wherein repeating each pilot tone at least one pilot tone based at least one pilot tone of multilayer transmission generation on the subband of an OFDM symbol.Also on the subband of the 2nd adjacent OFDM symbol, with at least one pilot tone of an OFDM symbol in other pilot tone phase deviation repeat described at least one pilot tone.This device also comprises a plurality of transmitter units, is used for transmitting each the OFDM symbol that sends respectively in the first and second OFDM symbols via a plurality of transmitting antennas at the layer of respective numbers.
According to another embodiment of the invention, a kind of method of carrying out channel estimating in wireless communication system has been described.This method comprises via a plurality of reception antennas and obtains a plurality of receiving symbols, and each receiving symbol in the described receiving symbol all comprises the ground floor pilot tone, its adjacent symbol in subband each other skew ground comprise the ground floor pilot tone.This method also comprises based on the ground floor pilot tone handles receiving symbol, so that obtain the estimation to a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
According to another embodiment of the invention, a kind of device that is used in the wireless communication system has been described.This device comprises a plurality of receiver units, is used to provide a plurality of receiving symbols, and each receiving symbol in the described receiving symbol all comprises the ground floor pilot tone, and its adjacent symbol comprises to skew the ground floor pilot tone each other in subband.This device also comprises channel estimator, is used for handling receiving symbol based on the ground floor pilot tone, so that obtain the estimation to a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
Description of drawings
Fig. 1 shows High Rate Packet Data (HRPD) communication system.
Fig. 2 shows the single carrier structure of time slot of supporting CDM.
Fig. 3 shows the single carrier structure of time slot of supporting OFDM.
Fig. 4 shows the block diagram of transmitter and receiver in High Rate Packet Data (HRPD) communication system.
Fig. 5 shows the multi-carrier time slot structure of supporting OFDM on conventional channel and non-traditional channel.
Fig. 6 shows the employed sub band structure of High Rate Packet Data (HRPD) communication system of supporting OFDM.
Fig. 7 A-Fig. 7 D shows the employed spatial pilot structure of High Rate Packet Data (HRPD) communication system of supporting OFDM.
Fig. 8 shows the block diagram of the transmitter in High Rate Packet Data (HRPD) communication system of supporting OFDM.
Fig. 9 shows the block diagram of the receiver in High Rate Packet Data (HRPD) communication system of supporting OFDM.
Embodiment
Transmission technology as described herein can be used for various wireless communication systems, for example CDMA, TDMA, FDMA, OFDMA and SC-FDMA system.Term " system " and " network " normally are used interchangeably.Cdma system can be realized for example UTRA radiotechnicss such as (E-UTRA) of cdma2000, general land wireless access (UTRA), evolution.Cdma2000 has been contained IS-2000, IS-95 and IS-856 standard.UTRA comprises wideband CDMA (W-CDMA) and low spreading rate (LCR).Tdma system can be realized for example radiotechnics of global system for mobile communications (GSM).The OFDMA system can realize for example Long Term Evolution (LTE), IEEE 802.20, Flash-
Etc. radiotechnics.In the document of " third generation partner program " tissue (3GPP) by name, UTRA, E-UTRA, GSM and LTE have been described.In the document of " third generation partner program 2 " tissue (3GPP2) by name, cdma2000 has been described.Radiotechnics that these are different and standard are known in the art.
For clarity sake, below at the various aspects of this technology of High Rate Packet Data (HRPD) system description that realizes IS-856.HRPD is also referred to as data-optimized (EV-DO), data-optimized (DO), high data rate (HDR) of evolution etc.Term HRPD and EV-DO often exchange use.Current, HRPD version (Rev.) 0, A and B are by standardization, and HRPD Rev.0 and A have obtained exploitation, and HRPD Rev.C is just under development.HRPD Rev.0 and A are contained single carrier HRPD (1xHRPD).HRPD Rev.B is contained multicarrier HRPD and backward compatibility HRPD Rev.0 and A.Technology as described herein can be incorporated in any HRPD version.For clarity sake, use term HRPD during major part is below described.
Fig. 1 shows the HRPD communication system 100 with a plurality of access points 110 and a plurality of terminal 120.Usually, access point is the fixed station that communicates with terminal, also can be called as base station, Node B etc.Each access point 110 covers for the specific geographical area provides communication, and support is positioned at the communication of the terminal of this overlay area.Access point 110 can couple most, and these access points provide the system controller 130 of coordinating and controlling.System controller 130 can comprise network entity, for example base station controller (BSC), Packet Control Function entity (PCF), packet data serving node (PDSN) etc.
Fig. 2 shows the single carrier structure of time slot 200 of supporting CDM among the HRPD on the forward link.The transmission time line is divided into a plurality of time slots.Each time slot has the duration of 1.667 milliseconds (ms) and crosses over 2048 chips.For the spreading rate of 1.2288 million chips/sec (Mcps), each chip has the duration of 813.8 nanoseconds (ns).Each time slot is divided into two equal half cracks.Each half crack comprises: (i) control the expense section that (MAC) section is formed by the pilot that is in center, half crack with in two media interviews of pilot both sides; (ii) in the traffic segment of expense section both sides.Traffic segment also can be called as traffic channel segments, data segment, data field etc.Pilot carries pilot tone, and has the duration of 96 chips.Each MAC section carrier signaling (for example, reverse power control (RPC) information), and have duration of 64 chips.Each traffic segment bearer service data (for example) for the unicast data of particular terminal, broadcast data etc., and have duration of 400 chips.
HRPD Rev.0, A and B use CDM for the data that send in traffic segment.Traffic segment can be the one or more terminal carrying CDM data by the access point service.Can handle the business datum of each terminal based on coding and modulation parameter, so that generate data symbol, described coding and modulation parameter are determined by the channel feedback that receives from this terminal.Can utilize 16 chip Walsh functions or coding that the data symbol of one or more terminals is carried out demultiplexing and covering (cover), so that generate the CDM data of traffic segment.Thus, use the Walsh function to generate the CDM data in time domain.The CDM traffic segment is the traffic segment of carrying CDM data.
May expect to use OFDM and/or single carrier frequency division multiplexing (SC-FDM) for the data that in traffic segment, send.OFDM and SC-FDM are divided into a plurality of orthogonal sub-carriers with available bandwidth, and it also can be called as tone (tone), frequency range (bin) etc.Each subcarrier is adjustable to be shaped on data.Usually, in frequency domain, utilize OFDM and in time domain, utilize SC-FDM to send modulation symbol.OFDM and SC-FDM have some gratifying characteristic, for example can easily suppress the ability of the intersymbol interference (ISI) that caused by frequency selective fading.OFDM can also support MIMO and SDMA efficiently, and it can be applied in separately on each subcarrier, thereby and can provide good performance in frequency-selective channel.For clarity sake, use OFDM is described below and sends data.
May expect to support OFDM, keep backwards compatibility simultaneously with HRPD Rev.0, A and B.In HRPD, all active terminal constantly can be carried out demodulation to pilot tone and MAC section at all, but only have just serviced terminal to carry out demodulation to traffic segment.So, can be by keeping pilot tone and MAC section and revising traffic segment and realize backwards compatibility.By amounting to 400 chips or one or more OFDM symbols of littler duration and replace CDM data in the given 400 chip traffic segment, can in the HRPD waveform, send the OFDM data to have
Fig. 3 shows the single carrier structure of time slot 300 of supporting OFDM in HRPD.For brevity, in Fig. 3 A, only show one " half crack ".This half crack comprises: (i) by the expense section of forming in two 64 chip MAC sections of 96 chip pilots of center, half crack and pilot both sides and (ii) two traffic segment of expense section both sides.Usually, each traffic segment can be carried one or more OFDM symbols.In the example shown in Fig. 3 A, two OFDM symbols of each traffic segment carrying, and each OFDM symbol has the duration of 200 chips and sends in the OFDM of one 200 chip symbol period.
Fig. 4 shows the details of access point 110 and two the terminal 120a and the 120b of many antennas HRPD communication system 100.For simplicity's sake, access point 110 has two transmitting antennas, and MISO terminal 120a has single receive antenna, and MIMO terminal 120b has two reception antennas.
Can pass through the capable vector of 1 * 2 channel response
h 1 * 2Characterize by two antennas at access point 110 places and the formed MISO channel of individual antenna at MISO terminal 120a place.Can pass through 2 * 2 channel response matrixs
H 2 * 2Characterize by two antennas at access point 110 places and two formed mimo channels of antenna at MIMO terminal 120b place.Access point 110 is from two transmission antennas transmit pilot tones, so that MISO and MIMO terminal can be estimated their MISO and mimo channels separately.Pilot tone maker 112 at access point 110 places can generate composite pilot.
Fig. 5 shows the multi-carrier time slot structure 400 of supporting OFDM in HRPD.In HRPDRev.B, can in frequency domain, carry out multiplexingly to a plurality of 1xHRPD waveforms, to obtain multicarrier HRPD waveform, this waveform is filled given spectrum allocation may and is launched on first transmitting antenna.In the example shown in Fig. 5, a 1xHRPD waveform is depicted as is configured as conventional channel, it comprises and can be carried out the pilot tone and the MAC section of demodulation constantly at all by all active terminal, and the traffic segment that only can be carried out demodulation by just serviced terminal.So, can realize backwards compatibility by keeping pilot tone and MAC section.In Fig. 5, also show three 1xHRPD waveforms, it is configured to non-traditional channel, described waveform is launched on second, third and the 4th transmitting antenna respectively, and it does not need the expense section, because the OFDM symbol comprises the periodicity composite pilot that is embedded in subband or the tone.As described herein, the pilot tone maker 112 of Fig. 4 generates composite pilot to transmit in the OFDM symbol.Receive MIMO terminal 120b (Fig. 4) and receive known composite pilot in the OFDM symbol, and can derive estimation the mimo channel response.
Multiaerial system can utilize a plurality of carrier waves to carry out data and pilot transmission.Can provide a plurality of carrier waves by OFDM, some other multi-carrier modulation technologies or some other structures.Orthogonal frequency sub-bands that OFDM is divided into whole system bandwidths (W MHz) effectively a plurality of (K).These subbands are also referred to as tone, subcarrier, frequency range and channel.By OFDM, each subband is associated with the adjustable subcarrier separately that is shaped on data.Many antennas ofdm system can only use the subclass of whole K subband to carry out data and pilot transmission, and remaining subband can be as the protection subband, so that system can satisfy spectral mask requirements.For simplicity's sake, suppose that in the following description whole K subband all can be used for data and/or pilot transmission.
Fig. 6 shows the sub band structure 500 that can be used for carrying out at many antennas ofdm system pilot transmission.On each of the P that is used for a pilot transmission pilot subbands, send emission symbol, wherein K＞P.Handle for improving performance and simplified receiver, P pilot subbands can be evenly distributed on whole K subband, make continuous pilot subbands separate mutually with K/P subband.Remaining K-P subband can be used for transfer of data, and is called as data subband.
Fig. 7 A-Fig. 7 D shows the exemplary pilot transmission scheme that is used for many antennas ofdm system.Present embodiment has utilized the spatial pilot tone, and described spatial pilot tone is to form differently according to the layer of many antennas ofdm system formation or the quantity of wave beam.Particularly, because can come cambium layer,, and must rely on the pilot tone that forms for certain layer or wave beam so the characteristic of channel can not merely rely on the pilot tone of an antenna accurately by the wave beam that combination of antennas caused.According to the spatial pilot transmission plan of Fig. 7 A-Fig. 7 D, every layer of pilot power budget increases along with the minimizing of space layer quantity.
Fig. 7 A shows the individual layer transmission on the half crack of OFDM symbol 1-4.Shown as each the OFDM symbol to for example OFDM symbol 1, individual layer spatial pilot tone repeats once and takies a tone for per 19 data tones.For the OFDM symbol of 180 tones, will have 9 individual layer spatial pilot tones.Particularly, for OFDM symbol 1 and OFDM symbol 3, individual layer spatial pilot tone is shown to begin at tone one place, and per 20 tones repeat once, and for OFDM symbol 2 and OFDM symbol 4, individual layer spatial pilot tone is shown begins, and per 20 tones repeat once at tone 11 places that are offset from adjacent symbols one half-distance.Therefore, for the individual layer transmission, be used to support that the broadband expense of individual layer spatial pilot tone is 1/20th or 5 percent of each OFDM symbol.In the contiguous OFDM symbol of for example OFDM symbol 2, individual layer spatial pilot pitch shift is in the individual layer spatial pilot tone of adjacent symbols.Be also noted that an OFDM symbol can influence the deviation post of the individual layer spatial pilot tone of contiguous OFDM symbol in order to obtain the additional channel feature, and do not need to rely on additional private space pilot tones.
Fig. 7 B shows the two-layer or double-deck transmission on the half crack of OFDM symbol 1-4.Shown as each OFDM symbol to for example OFDM symbol 1, ground floor spatial pilot tone repeats once and takies a tone for per 19 data tones, and second layer spatial pilot pitch shift is in ground floor, and also is to repeat once and take a tone for per 19 data tones.For the OFDM symbol of 180 tones, will have 18 ground floors and second layer spatial pilot tone.Particularly, for OFDM symbol 1 and OFDM symbol 3, ground floor is shown and second layer spatial pilot tone begins at tone one place, and per 10 tones repeat once, and for OFDM symbol 2 and OFDM symbol 4, ground floor and second layer spatial pilot tone are shown begin, and per 10 tones repeat once at tone 11 places that are offset from adjacent symbols one half-distance.Therefore, for two-layer transmission, be used to support that the broadband expense of ground floor and second layer spatial pilot tone is 1/10th or 10 of each OFDM symbol.
Fig. 7 C shows three layers of transmission on the half crack of OFDM symbol 1-4.As shown to each OFDM symbol, ground floor spatial pilot tone repeats once and takies a tone for per 29 data tones, second layer spatial pilot tone repeats once and takies a tone for per 29 data tones, and the 3rd sheaf space pilot tones repeats once and take a tone for per 29 data tones.Ground floor, the second layer and the 3rd sheaf space pilot tones are staggered and repeat along OFDM symbol 1-4, make ground floor, the second layer and the 3rd sheaf space pilot tones repeat once for per 10 tones and take a tone for per 9 data tones.For the OFDM symbol of 180 tones, will have 18 ground floors, the second layer and the 3rd sheaf space pilot tones.Therefore, for three layers of transmission, be used to support that the broadband expense of ground floor, the second layer and the 3rd sheaf space pilot tones is 1/10th or 10 of each OFDM symbol.
Fig. 7 D shows four layers of transmission on the half crack of OFDM symbol 1-4.As shown to each OFDM symbol, ground floor spatial pilot tone repeats once and takies a tone for per 19 data tones, second layer spatial pilot tone repeats once and takies a tone for per 19 data tones, the 3rd sheaf space pilot tones repeats once and takies a tone for per 19 data tones, and the four-level space pilot tones repeats once and take a tone for per 19 data tones.Ground floor, the second layer, the 3rd layer and four-level space pilot tones are staggered and repeat along OFDM symbol 1-4, make ground floor, the second layer, the 3rd layer and four-level space pilot tones repeat once for per 5 tones and take a tone for per 4 data tones.For the OFDM symbol of 180 tones, will have 36 ground floors, the second layer, the 3rd layer and four-level space pilot tones.Therefore, for four layers of transmission, be used to support the broadband expense of ground floor, the second layer, the 3rd layer and four-level space pilot tones to be 20 1/5th or percent of each OFDM symbol.
Since distinct symbols in the cycle on the same group P pilot subbands not the different sheaf space pilot tones of transmission, therefore this staggered pilot scheme makes that the MIMO receiver can be in any one symbol period, under the situation that does not increase the number of sub-bands that is used for pilot transmission, obtain than its particular sub-band more pilot observation.For all pilot transmission schemes, the MIMO receiver can be estimated based on the symbol of its reception and the frequency response of using various channel estimation techniques to derive channel.
Fig. 8 shows the block diagram at the embodiment of access point 110 TX of place spatial processors 830 and transmitter unit 832.TX spatial processor 830 comprises: pilot tone maker 910, data space processor 920 and T multiplexer (Mux) 930a that is used for T transmitting antenna are to 930t.
Data space processor 920 receives data symbol from TX data processor 820, and these data symbols are carried out spatial manipulation.For example, data space processor 920 can be T son stream of T transmitting antenna with the data symbol demultiplexing.Depend on system design, data space processor 920 can or can not carried out additional space to this a little stream and handle.Each multiplexer 930 from data space processor 920 receive separately data symbols work song stream with and the emission symbol of the transmitting antenna that is associated, it is multiplexing to utilize the emission symbol that the data symbol is carried out, and output symbol stream is provided.
Each transmitter unit 832 receives and handles output symbol stream separately.In each transmitter unit 832 inside, IFFT unit 942 uses K point IFFT that K output symbol of whole K subbands in every group transformed in the time domain, and the figure shift that comprises K time domain chip is provided.Cyclic Prefix maker 944 repeats the part of each figure shift, comprises the OFDM symbol of K+C chip with formation, and wherein C is the quantity of repeated chips.The part that repeats is called as Cyclic Prefix, and is used for suppressing the time delay expansion of wireless channel.TX radio frequency (RF) unit 946 converts the OFDM symbols streams to one or more analog signals, and further to this analog signal amplify, filtering and up-conversion so that generate modulation signal, this modulation signal is launched by associated antenna 834.Cyclic Prefix maker 944 and/or TX RF unit 946 also can provide cycle time-delay for its transmitting antenna.
Fig. 9 shows the block diagram of MIMO terminal 120b in many antennas ofdm system.At MIMO terminal 120b place, R antenna 852a receives T modulation signal to 852r, and each antenna 852 is provided to separately receiver unit 854 with received signal.Each receiver unit 854 is carried out and the performed processing complementary processing of transmitter unit, and: (1) will receive data symbol and be provided to RX spatial processor 860y; And (2) will receive the channel estimator 884y that frequency pilot sign is provided to controller 880y inside.Channel estimator 884y carries out channel estimating for the MIMO receiver, and provides the mimo channel response to estimate.RX spatial processor 860y utilizes mimo channel response to estimate, to from R the reception data symbol stream execution spatial manipulation of R receiver unit 854a to 854r, and provides detected symbol.RX data processor 870y carries out symbol de-maps, deinterleaving and decoding to detected symbol, and decoded data is provided.Controller 880y is controlled at the operation of the various processing units at MIMO terminal 120b place, and employed data of memory cell 882y storage control 880y and/or program code.
It will be appreciated by those skilled in the art that and to use any in multiple different technologies and the method to come expression information and signal.For example, data, instruction, order, information, signal, bit, symbol and the chip of mentioning in above describing can be represented by voltage, electric current, electromagnetic wave, magnetic field or particle, light field or particle or its combination in any.
Those skilled in the art it shall yet further be noted that in conjunction with the described various illustrative logical blocks of present disclosure, module, circuit and algorithm steps and can be implemented as electronic hardware, computer software or both combinations.For this interchangeability of hardware and software clearly is described, above aspect functional, various example components, square frame, module, circuit and step have been described prevailingly.This functional concrete application and the design constraint that hardware or software depend on whole system that whether be embodied as.For various concrete application, the technical staff can realize described function with different modes, but this realization decision-making should not be understood that to depart from the scope of disclosure file.
Can utilize general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or design to be used for carrying out the combination in any of institute's representation function here, realize or carry out in conjunction with the described various illustrative logical blocks of disclosure file, module and circuit.General processor can be a microprocessor, but alternatively, this processor can be any conventional processor, controller, microcontroller or state machine.Processor also can be implemented as the combination of computing equipment, the combination of for example combination of the combination of DSP and microprocessor, a plurality of microprocessors, one or more microprocessor and DSP kernel or any other this configuration.
Can be in conjunction with the step of described method of disclosure file or algorithm by in the software module or both combinations that directly cover hardware, carry out by processor.Software module can reside at RAM memory, flash memories, ROM memory, eprom memory, eeprom memory, register, hard disk, removable dish, CD-ROM or any other storage medium form known in the art.A kind of exemplary storage medium is coupled to processor, makes that processor can be from this read information and to this storage medium writing information.Alternatively, storage medium can be integrated in the processor.Processor and storage medium can reside among the ASIC.ASIC can reside in the user terminal.Alternatively, processor and storage medium can be resident as discrete assembly in user terminal.
The aforementioned content of disclosure file is provided, has made those skilled in the art can develop or utilize disclosure file.The various modifications of disclosure file will be apparent to those skilled in the art, and under the situation of the spirit or scope that do not depart from disclosure file, defined here general principle can be applied in other modification.Therefore, disclosure file is not intended to be limited to example as described herein, and should give and principle disclosed herein and the corresponding to maximum magnitude of novel feature.
Claims (35)
1, a kind of method that sends pilot tone in wireless communication system comprises:
Generation is used for the ground floor pilot tone of individual layer transmission;
On the subband of an OFDM symbol, repeat described ground floor pilot tone;
On the subband of the 2nd contiguous OFDM symbol, with the described ground floor pilot tone phase deviation of a described OFDM symbol repeat described ground floor pilot tone; And
In described individual layer transmission, send the described first and second OFDM symbols.
2, the method for claim 1 also comprises:
Generation is used for the second layer pilot tone of two-layer transmission;
On the subband of an OFDM symbol, with the phase deviation of described ground floor pilot tone repeat described second layer pilot tone;
On the subband of the 2nd contiguous OFDM symbol, with the described second layer pilot tone phase deviation of a described OFDM symbol repeat described second layer pilot tone; And
In described two-layer transmission, send the described first and second OFDM symbols.
3, method as claimed in claim 2 also comprises:
Generation is used for the 3rd layer of pilot tone of three layers of transmission;
On the subband of an OFDM symbol, with described first and second layers of pilot tone phase deviation repeat described the 3rd layer of pilot tone;
On the subband of the 2nd contiguous OFDM symbol, with described the 3rd layer of pilot tone phase deviation of a described OFDM symbol repeat described the 3rd layer of pilot tone; And
In described three layers of transmission, send the described first and second OFDM symbols.
4, method as claimed in claim 3 also comprises:
Generation is used for the 4th layer of pilot tone of four layers of transmission;
On the subband of an OFDM symbol, with described first, second and the 3rd layer of pilot tone phase deviation repeat described the 4th layer of pilot tone;
On the subband of the 2nd contiguous OFDM symbol, with described the 4th layer of pilot tone phase deviation of a described OFDM symbol repeat described the 4th layer of pilot tone; And
In described four layers of transmission, send the described first and second OFDM symbols.
5, method as claimed in claim 2, wherein, described first and second layers of pilot tone alternately are arranged in the same sub-band of the described first and second OFDM symbols.
6, method as claimed in claim 3, wherein, described first, second and the 3rd layer of pilot tone alternately are arranged in the same sub-band with contiguous described first, second and the 3rd OFDM symbol of at least one OFDM symbol of the described first and second OFDM symbols.
7, method as claimed in claim 6, wherein, described first, second, third and the 4th layer of pilot tone alternately is arranged in the same sub-band with contiguous described first, second, third and the 4th OFDM symbol of described first, second and at least one OFDM symbol of the 3rd OFDM symbol.
8, the method for claim 1, wherein described ground floor pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 5 percent.
9, method as claimed in claim 2, wherein, described first and second layers of pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 10.
10, method as claimed in claim 3, wherein, described first, second and the 3rd layer of pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 10.
11, method as claimed in claim 4, wherein, described first, second, third and the 4th layer of pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 20 percent.
12, a kind of device that is used in the wireless communication system comprises:
The pilot tone maker, be used for based at least one pilot tone of multilayer transmission generation, wherein on the subband of an OFDM symbol, repeat each pilot tone in described at least one pilot tone, and on the subband of the 2nd contiguous OFDM symbol, with described at least one pilot tone of a described OFDM symbol in other pilot tone phase deviation repeat each pilot tone in described at least one pilot tone; And
A plurality of transmitter units are used for via a plurality of transmitting antennas each OFDM symbol in the described first and second OFDM symbols of layer transmission transmission of respective numbers.
13, device as claimed in claim 12, wherein, described at least one pilot tone comprises the ground floor pilot tone that is used for the individual layer transmission, and wherein, described ground floor pilot tone is offset on the subband of the described first and second OFDM symbols.
14, device as claimed in claim 12, wherein, described at least one pilot tone comprises ground floor pilot tone and the second layer pilot tone that is used for two-layer transmission, and wherein, described first and second layers of pilot tone are offset on the subband of the described first and second OFDM symbols.
15, device as claimed in claim 12, wherein, described at least one pilot tone comprises ground floor pilot tone, second layer pilot tone and the 3rd layer of pilot tone that is used for three layers of transmission, and wherein, described first, second is offset on the subband of the described first and second OFDM symbols with the 3rd layer of pilot tone.
16, device as claimed in claim 12, wherein, described at least one pilot tone comprises ground floor pilot tone, second layer pilot tone, the 3rd layer of pilot tone and the 4th layer of pilot tone that is used for four layers of transmission, and wherein, described first, second, third and the 4th layer of pilot tone is offset on the subband of the described first and second OFDM symbols.
17, device as claimed in claim 14, wherein, described first and second layers of pilot tone alternately are arranged in the same sub-band of the described first and second OFDM symbols.
18, device as claimed in claim 15, wherein, described first, second and the 3rd layer of pilot tone alternately are arranged in the same sub-band of first, second adjacent with described at least one OFDM symbol of the first and second OFDM symbols and the 3rd OFDM symbol.
19, device as claimed in claim 16, wherein, described first, second, third and the 4th layer of pilot tone alternately is arranged in the same sub-band with described first, second first, second, third and four OFDM symbol adjacent with at least one OFDM symbol of the 3rd OFDM symbol.
20, device as claimed in claim 13, wherein, described ground floor pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 5 percent.
21, device as claimed in claim 14, wherein, described first and second layers of pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 10.
22, device as claimed in claim 15, wherein, described first, second and the 3rd layer of pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 10.
23, device as claimed in claim 16, wherein, described first, second, third and the 4th layer of pilot tone take each OFDM symbol in the described first and second OFDM symbols subband about 20 percent.
24, a kind of device that is used in the wireless communication system comprises:
Be used to generate the module of the ground floor pilot tone that is used for the individual layer transmission;
Be used on the subband of an OFDM symbol, repeating the module of described ground floor pilot tone;
Be used at the 2nd contiguous OFDM symbol subband, with the described ground floor pilot tone phase deviation of a described OFDM symbol repeat the module of described ground floor pilot tone; And
Be used for sending the module of the described first and second OFDM symbols in described individual layer transmission.
25, device as claimed in claim 24 also comprises:
Be used to generate the module of the second layer pilot tone that is used for two-layer transmission;
Be used at an OFDM symbol subband, with the phase deviation of described ground floor pilot tone repeat the module of described second layer pilot tone;
Be used at the 2nd contiguous OFDM symbol subband, with the described second layer pilot tone phase deviation of a described OFDM symbol repeat the module of described second layer pilot tone; And
Be used for sending the module of the described first and second OFDM symbols in described two-layer transmission.
26, device as claimed in claim 25 also comprises:
Be used to generate the module of the 3rd layer of pilot tone that is used for three layers of transmission;
Be used at an OFDM symbol subband, with described first and second layers of pilot tone phase deviation repeat the module of described the 3rd layer of pilot tone;
Be used at the 2nd contiguous OFDM symbol subband, with described the 3rd layer of pilot tone phase deviation of a described OFDM symbol repeat the module of described the 3rd layer of pilot tone; And
Be used for sending the module of the described first and second OFDM symbols in described three layers of transmission.
27, device as claimed in claim 26 also comprises:
Be used to generate the module of the 4th layer of pilot tone that is used for four layers of transmission;
Be used at an OFDM symbol subband, with described first, second and the 3rd layer of pilot tone phase deviation repeat the module of described the 4th layer of pilot tone;
Be used at the 2nd contiguous OFDM symbol subband, with described the 4th layer of pilot tone phase deviation of a described OFDM symbol repeat the module of described the 4th layer of pilot tone; And
Be used for sending the module of the described first and second OFDM symbols in described four layers of transmission.
28, a kind of method of carrying out channel estimating in wireless communication system comprises:
Obtain a plurality of receiving symbols via a plurality of reception antennas, each receiving symbol in the described receiving symbol all comprises the ground floor pilot tone, and its contiguous symbol comprises to skew described ground floor pilot tone mutually in subband; And
Handle described receiving symbol based on described ground floor pilot tone, so that obtain estimation to a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
29, method as claimed in claim 28 also comprises:
Obtain a plurality of receiving symbols via a plurality of reception antennas, each receiving symbol in the described receiving symbol also comprises second layer pilot tone, and its contiguous symbol comprises to skew described second layer pilot tone mutually in described subband; And
Handle described receiving symbol based on described first and second layers of pilot tone, so that obtain estimation to a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
30, method as claimed in claim 29 also comprises:
Obtain a plurality of receiving symbols via a plurality of reception antennas, each receiving symbol in the described receiving symbol also comprises the 3rd layer of pilot tone, and its contiguous symbol comprises to skew described the 3rd layer of pilot tone mutually in described subband; And
Handle described receiving symbol based on described first, second with the 3rd layer of pilot tone, so that obtain estimation to a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
31, method as claimed in claim 30 also comprises:
Obtain a plurality of receiving symbols via a plurality of reception antennas, each receiving symbol in the described receiving symbol also comprises the 4th layer of pilot tone, and its contiguous symbol comprises to skew described the 4th layer of pilot tone mutually in described subband; And
Handle described receiving symbol based on described first, second, third and the 4th layer of pilot tone, so that obtain estimation to a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
32, a kind of device that is used in the wireless communication system comprises:
A plurality of receiver units are used to provide a plurality of receiving symbols, and each receiving symbol in the described receiving symbol all comprises the ground floor pilot tone, and its contiguous symbol comprises to skew described ground floor pilot tone mutually in subband; And
Channel estimator is used for handling described receiving symbol based on described ground floor pilot tone, so that obtain the estimation to a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
33, device as claimed in claim 32, wherein, described receiving symbol also comprises second layer pilot tone respectively, adjacent symbols in the wherein said receiving symbol comprises to skew described second layer pilot tone mutually in described subband, and wherein, described first and second layers of pilot tone are handled, so that acquisition is to the estimation of a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
34, device as claimed in claim 33, wherein, described receiving symbol also comprises the 3rd layer of pilot tone respectively, adjacent symbols in the wherein said receiving symbol comprises to skew described the 3rd layer of pilot tone mutually in described subband, and wherein, described first, second handled with the 3rd layer of pilot tone, so that acquisition is to the estimation of a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
35, device as claimed in claim 34, wherein, described receiving symbol also comprises the 4th layer of pilot tone respectively, adjacent symbols in the wherein said receiving symbol comprises to skew described the 4th layer of pilot tone mutually in described subband, and wherein, described first, second, third and the 4th layer of pilot tone handled, so that acquisition is to the estimation of a plurality of channels between a plurality of transmitting antennas and a plurality of reception antenna.
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| US77544306P | 2006-02-21 | 2006-02-21 | |
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| CNA2007800062519A Pending CN101595698A (en) | 2006-02-21 | 2007-02-20 | The spatial pilot structure that is used for multi-antenna wireless communication |
| CN2007800057879A Active CN101385272B (en) | 2006-02-21 | 2007-02-21 | Flexible payload control in data-optimized communication systems |
| CN200780005760XA Expired - Fee Related CN101385246B (en) | 2006-02-21 | 2007-02-21 | Reduced terminal power consumption via use of active hold state |
| CNA2007800060316A Pending CN101385271A (en) | 2006-02-21 | 2007-02-21 | Method and apparatus for selecting cdm or OFDM in a communication system |
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| CN200780005760XA Expired - Fee Related CN101385246B (en) | 2006-02-21 | 2007-02-21 | Reduced terminal power consumption via use of active hold state |
| CNA2007800060316A Pending CN101385271A (en) | 2006-02-21 | 2007-02-21 | Method and apparatus for selecting cdm or OFDM in a communication system |
| CNA2007800062504A Pending CN101390323A (en) | 2006-02-21 | 2007-02-21 | Method and apparatus for arranging packets in sub-slots in wireless communication |
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| US8331483B2 (en) * | 2009-08-06 | 2012-12-11 | Lg Electronics Inc. | Method for transmitting feedback information via a spatial rank index (SRI) channel |
| CN104486024B (en) * | 2010-09-27 | 2017-08-25 | Lg电子株式会社 | Reinforced Access Channel mask for XHRPD |
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| CN103458415B (en) * | 2012-05-28 | 2016-12-28 | 华为技术有限公司 | Empty subcarrier dynamic setting method, method of reseptance and Apparatus and system |
| US9692550B2 (en) | 2012-11-29 | 2017-06-27 | Huawei Technologies Co., Ltd. | Systems and methods for waveform selection and adaptation |
| CN105208672B (en) * | 2014-05-26 | 2019-02-22 | 北京信威通信技术股份有限公司 | A kind of channel information management method for the EPS network architecture |
| WO2016082101A1 (en) * | 2014-11-25 | 2016-06-02 | 华为技术有限公司 | Signal transmission method and apparatus |
| CN106034329B (en) * | 2015-03-09 | 2019-09-17 | 电信科学技术研究院 | A kind of method for transmitting signals and device |
| US11212147B2 (en) * | 2015-10-23 | 2021-12-28 | Huawei Technologies Co., Ltd. | Systems and methods for configuring carriers using overlapping sets of candidate numerologies |
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| WO2017132806A1 (en) * | 2016-02-01 | 2017-08-10 | 华为技术有限公司 | Method for configuring pilot signal, and first device |
| MX2019001219A (en) | 2016-07-28 | 2019-06-03 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Pilot signal transmission method, terminal equipment, and network equipment. |
| GB201704826D0 (en) * | 2017-03-27 | 2017-05-10 | Ocado Innovation Ltd | Wireless communications system with discrimination between extraneous received signals |
| EP3567789B1 (en) * | 2018-05-11 | 2020-11-25 | ASUSTek Computer Inc. | Method and apparatus for determining slot configuration in a wireless communication system |
| EP3694287B1 (en) * | 2019-02-06 | 2024-05-22 | Hitachi Energy Ltd | Time-slotted scheduling of packets in an industrial wireless network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102656856A (en) * | 2009-12-17 | 2012-09-05 | 德克萨斯仪器股份有限公司 | Pilot subcarriers in wireless transmissions |
| CN102656856B (en) * | 2009-12-17 | 2016-05-04 | 德克萨斯仪器股份有限公司 | Pilot sub-carrier in wireless transmission |
Also Published As
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| CN101385246B (en) | 2013-11-20 |
| CN101385246A (en) | 2009-03-11 |
| CN101390324A (en) | 2009-03-18 |
| CN101390324B (en) | 2013-02-06 |
| CN101385272B (en) | 2012-04-25 |
| CN101390323A (en) | 2009-03-18 |
| CN101385272A (en) | 2009-03-11 |
| CN101390328A (en) | 2009-03-18 |
| CN101385271A (en) | 2009-03-11 |
| ES2357161T3 (en) | 2011-04-19 |
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