CN101635619B - Method, base station and system for transmitting subcarriers - Google Patents

Method, base station and system for transmitting subcarriers Download PDF

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Publication number
CN101635619B
CN101635619B CN200910091901A CN200910091901A CN101635619B CN 101635619 B CN101635619 B CN 101635619B CN 200910091901 A CN200910091901 A CN 200910091901A CN 200910091901 A CN200910091901 A CN 200910091901A CN 101635619 B CN101635619 B CN 101635619B
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subcarrier
signal
base station
transmission
several
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CN101635619A (en
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王俊
王文杰
米泉
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2010/076244 priority patent/WO2011023088A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • H04L5/0092Indication of how the channel is divided
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • H04L5/0094Indication of how sub-channels of the path are allocated
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2655Synchronisation arrangements

Abstract

The embodiment of the invention provides a method, a base station and a system for transmitting subcarriers. The method comprises the steps: dividing a plurality of subcarriers of signals to be transmitted on the entire frequency band into a plurality of transmission groups; distributing the subcarriers of the signals to be transmitted on the entire frequency band to at least two transmission antennas of the base station and broadcasting and transmitting the signals. The method and the system for transmitting subcarriers can enhance the average power of each subcarrier for transmitting the same OFDM signal by a plurality of transmission antennae under the condition that each antenna transmits partial data by synchronous/broadcasting/controlling channels formed by omnibearing wave beams, thereby increasing the coverage range of downlink channels of the base station, raising the signal-to-noise ratio for the reception of user equipment, ensuring the reliable decoding of information transmitted by the user equipment to the base station, enlarging district edge coverage and increasing the throughput.

Description

Subcarrier sending method, base station and system
Technical field
The embodiment of the invention relates to does not have the letter communication technical field, relates in particular to a sub-carrier sending method, base station and system.
Background technology
Insert (Orthogonal Frequency Division MultipleAccess at the 802.16e OFDM; Hereinafter to be referred as: OFDMA) under the frame structure pattern; In the base station down information frame first three " an OFDM symbol " need be broadcasted transmission to all subscriber equipmenies, and described first three individual " OFDMsymbol " comprises synchronizing signal (Preamble) signal (accounting for an OFDM symbol), frame control head (Frame Control Header respectively; Hereinafter to be referred as: FCH) and DL_MAP (accounting for two OFDMsymbol).
Wherein, " Preamble " signal message is used for subscriber equipment and carries out synchronously, obtains cell ID (CellID) information and receive signal strength signal intensity indication (Receive Signal Strength Indicator; Hereinafter to be referred as: RSSI), carrier-in-interference noise ratio (Carrier-to-interference-and-noise ratio; Hereinafter to be referred as: CINR) measure etc.; The DL_MAP signal message has comprised that the configuration information of each subband (burst) is controlled signaling with part in the downlink frame, and its coded system is confirmed by FCH.
This shows that subscriber equipment need carry out reliable decoding to these information, thereby guarantee correct decoding follow-up " burst ".In order to guarantee that these information can be by the subscriber equipment reliable reception, the agreement regulation adopts biphase phase shift keying (the Boosted Binary PhaseShift Keying of power ascension to " Preamble " signal; Hereinafter to be referred as: modulation system Boosted BPSK), adopt orthogonal PSK (Quadrature Phase Shift Keying to DL_MAP signal and FCH signal; Hereinafter to be referred as: QPSK) modulation system.
In realizing process of the present invention; The inventor finds to have following problem in the prior art at least: though adopt the high modulation system of robustness to improve the message pick-up success rate to three above-mentioned signals in the prior art; But under 802.16e OFDMA frame structure pattern; In the emission process of base station to first three " OFDMsymbol " signal of downlink information frame; Because radio-frequency head power discharging device level is limited, thereby cause the subscriber equipment received signal to noise ratio lower and can't guarantee this information is carried out reliable decoding.
Summary of the invention
The embodiment of the invention provides a sub-carrier sending method, base station and system, in order to solving the defective that subscriber equipment in the prior art can't reliable reception information, and reliable reception that can guarantee information.
The embodiment of the invention provides a sub-carrier sending method, comprising:
Signal to be sent several subcarriers on whole frequency are divided into several transmission groups, are that unit broadcasts transmission for the M transmit antennas of base station said signal to be sent several subcarrier allocation on whole frequency with said transmission group, wherein M >=2.
The embodiment of the invention provides a kind of base station, comprising:
The allocation process module; Be used for signal to be sent several subcarriers on whole frequency are divided into several transmission groups; And to be unit with said transmission group give the M transmit antennas of base station, wherein M >=2 with said signal to be sent several subcarrier allocation on whole frequency;
Transmitting antenna is used for the subcarrier of said allocation process module assignment is broadcasted transmission.
The embodiment of the invention also provides a sub-carrier transmitting system, comprises base station that the foregoing description provides and the subscriber equipment that is used to receive the subcarrier that said base station broadcast sends.
Subcarrier sending method, base station and system that the embodiment of the invention provides; To same downlink information frame through the data on many transmit antennas and the every antenna transmission part frequency domain; Can promote the average power of each subcarrier, thereby increase base station down channel coverage and promote the subscriber equipment received signal to noise ratio, guarantee that subscriber equipment carries out reliable decoding to the information of base station transmission; Increase cell edge and cover, promote throughput.
Description of drawings
Fig. 1 is a subscriber equipment bit error rate performance emulation sketch map in one embodiment of the invention;
Fig. 2 is a subscriber equipment bit error rate performance emulation sketch map in another embodiment of the present invention;
Fig. 3 is subcarrier sending method embodiment one flow chart of the present invention;
Fig. 4 is the emission principle figure of subcarrier sending method embodiment one of the present invention;
Fig. 5 is subcarrier sending method embodiment two flow charts of the present invention;
Fig. 6 is subcarrier sending method embodiment of the present invention antenna more than two subcarrier distribution scheme sketch map;
Fig. 7 is that antenna switches sketch map in the embodiment of the invention;
Fig. 8 is an embodiment of the invention architecture of base station sketch map.
Embodiment
Further specify the technical scheme of the embodiment of the invention below in conjunction with accompanying drawing and specific embodiment.Under 802.16e OFDMA frame structure pattern; Need broadcast the signal of transmission because the base station is to adopt lower-powered single antenna broadcasting send mode, thereby it is lower and can't guarantee this information is carried out the phenomenon of reliable decoding the subscriber equipment received signal to noise ratio to occur.Defective for fear of prior art; Increase the coverage of base station; Improve the subscriber equipment received signal to noise ratio, the embodiment of the invention provides a kind of multi-antenna omnidirectional wave beam to form scheme, is about to signal to be sent several subcarriers on whole frequency and is divided into several transmission groups; With the transmission group is that unit broadcasts transmission for the M transmit antennas of base station signal to be sent several subcarrier allocation on whole frequency, wherein M >=2.Embodiment of the invention purpose is to utilize many dwi hastasanas to help to wave beam, and the average transmit power through improving subcarrier is to guarantee the reliable reception of subscriber equipment.The embodiment of the invention is that example describes with 802.16e OFDMA frame structure, but is not limited to the transmission of this frame structure.
At first introduce with regard to following notion: ofdm system is a multicarrier system, and for example 1024 number of sub-carrier-10MHz bandwidth, or 2048 number of sub-carrier-20MHz bandwidth etc. are sent signal and are modulated on the multicarrier.Signal: refer to an OFDM symbol all subcarriers on frequency domain in the embodiment of the invention, for example 1024 number of sub-carrier.The part frequency domain data is meant a parton carrier wave on the OFDM symbol frequency domain, for example, only accounts for a part of subcarrier in 1024 subcarriers.Subcarrier is the least unit of an OFDM symbol, constitutes an OFDM symbol like 1024 number of sub-carrier on the 10MHz bandwidth time and frequency zone.
Below at first many dwi hastasanas being helped the principle that improves the average transmit power of subcarrier to wave beam introduces.
Suppose that signal to be sent has N on whole frequency tNumber of sub-carrier is to be launched, because radio-frequency head power discharging device level is limited, the single antenna maximum transmission power is P t, then when the base station adopted single antenna to broadcast transmission, mean allocation was P to the transmitting power of each subcarrier t/ N tIf the base station adopts M (M>=2) root antenna to carry out the broadcast transmission of this signal, with the N on each " OFDM symbol " signal tNumber of sub-carrier is divided into the M group according to the arrangement mode on frequency domain, and every transmit antennas is responsible for sending wherein one group, and then for any transmit antennas, mean allocation is P to the transmitting power of each subcarrier t/ (N t/ M)=M*P t/ N t, hence one can see that, and the transmitting power of distributing to each subcarrier has increased M doubly, thereby after receiving terminal merges, when subscriber equipment receives gross power and will increase to original base station with single-antenna transmission M times.
Can know according to Fuli Si (FRIIS) transmission formula; The base station adopts M root antenna to carry out the omni broadcast transmission can increase coverage distance doubly; And the subscriber equipment received signal to noise ratio increases M doubly when adopting single antenna to carry out broadcast transmission with respect to the base station; Be 10log M dB, thereby make bit error rate performance that the lifting of 10log M dB arranged.
Specifically can be referring to Fig. 1 and Fig. 2; Fig. 1 is a subscriber equipment bit error rate performance emulation sketch map in one embodiment of the invention; Fig. 2 is a subscriber equipment bit error rate performance emulation sketch map in another embodiment of the present invention; Wherein Fig. 1 representes is that subscriber equipment end speed is 30km/h, the error rate performance simulation result when transmitting antenna spacing is 0.5 λ, and what Fig. 2 represented is that subscriber equipment speed is 30km/h, error rate performance simulation result when antenna distance is 10 λ.Among Fig. 1 and Fig. 2, " * " representes single-antenna transmission, 2 antenna emissions of " △ " expression, and 4 antenna emissions of " " expression, wherein abscissa is represented signal to noise ratio (Signal to NoiseRatio; Hereinafter to be referred as: SNR), ordinate is represented the error rate (Bit Error Rate; Hereinafter to be referred as: BER), can know that adopting the broadcasting of multi-antenna omnidirectional wave beam to send the signal message bit error rate performance has obvious lifting by Fig. 1 and Fig. 2.In addition; Peak-to-average force ratio is too high also to be one of major defect of ofdm system; Promptly for single-carrier system; The instantaneous value of the output signal of OFDM transmitter has bigger fluctuation, and this will require the parts such as power amplifier, A/D converter, D/A converter of internal system to have very big linear dynamic range.And conversely, the non-linear of these parts also can produce nonlinear distortion to the bigger signal of dynamic range, and the harmonic wave that is produced can cause the phase mutual interference between subchannel, thereby influences the performance of ofdm system.According to analysis, for the ofdm system that sub-carrier number is N, limit peak-to-average power ratio (PAPR) is 10log 10NdB is an example with N=1024, and this moment, PAPR was 30dB, and certainly, this is a kind of very opposite extreme situations, and generally speaking, the PAPR in the ofdm system can not reach this numerical value.When adopting the omni broadcast beamforming algorithm that the embodiment of the invention proposed, the sub-carrier number that is assigned on each transmitting antenna is N/M, and therefore for every transmit antennas, the PAPR of this moment is 10log 10(N/M)=10log 10N-10log 10M dB this shows, for " Preamble ", FCH and DL_MAP signal, the omni-beam formation method that the embodiment of the invention provided can reduce the PAPR value of each transmitting antenna of base station to a certain extent, and the reduction amount is 10log 10M dB.
Can know according to above-mentioned correlation analysis; When in two antennas when emission, adopted in the base station, because the power of each subcarrier 2 times of sub-carrier power when increasing to single-antenna transmission, therefore; When each subcarrier transmitting power of subscriber equipment is single antenna 2 times, thus make bit error rate performance that the lifting of 3dB arranged.In like manner, in 4 antennas when emission, adopted in the base station, and when each sub-carrier power of receiving terminal is single antenna 4 times make bit error rate performance that the lifting of 6dB arranged.
Fig. 3 is subcarrier sending method embodiment one flow chart of the present invention; Fig. 4 is the emission principle figure of subcarrier sending method embodiment one of the present invention; Like Fig. 3 and shown in Figure 4, the multi-antenna omnidirectional wave beam formation method that present embodiment provides is with at micro-wave access global inter communication (Worldwide Interoperability forMicrowave Access; Hereinafter to be referred as: " Preamble " signal that WiMAX) send in the OFDMA frame structure base station in the system is that example describes, and specifically comprises:
Step 100, several subcarriers order that signal to be sent is evenly distributed on the whole frequency evenly is divided into M transmission group, and the included subcarrier of each said transmission group is sent in the M transmit antennas and the corresponding transmitting antenna of said transmission group;
Suppose that base station employing M transmit antennas carries out the for example broadcast transmission of " Preamble " signal of signal to be sent; Because the particularity of " Preamble " signal does not promptly belong to any arrangement territory; And be uniformly distributed on the full frequency band at " Preamble " signal on the physical frame, therefore can be with the N of " Preamble " signal in whole frequency domain tThe number of sub-carrier order evenly is divided into the M section successively and forms M transmission group, and every transmit antennas of base station is responsible for sending one of them transmission group.
Concrete since " Preamble " data to be agreements given by section (segment) number and the definite pseudo random sequence of cell ID (CELL ID), i.e. every couple of corresponding one group of pseudo random sequence code (Pseudo-Noise with " segment " of CELL ID; Hereinafter to be referred as: the PN sign indicating number), this PN sign indicating number is assigned on the corresponding subcarrier of this " segment " after modulating through " BoostedBPSK ", accomplishes " Preamble " modulation, therefore this PN sign indicating number is carried out the deviation that segmentation can not cause its PAPR.After having divided the transmission group, the subcarrier that each transmission group is included sends to transmitting antenna corresponding with this transmission group in the M transmit antennas of base station.
Step 101; Through with the corresponding transmitting antenna of said transmission group; The included subcarrier of each self-corresponding transmission group is added edge protection tape handling, Fourier inversion processing successively and adds circulation prefix processing, and broadcast transmission after being modulated to radio frequency.
After each transmit antennas of base station receives the subcarrier that is about to send, at first for subcarrier adds the protection sideband, promptly in subcarrier that does not have data and the reset of protection subcarrier; Transform to time domain and add Cyclic Prefix (Cyclic Prefix through carrying out Fourier inversion (IFFT) again after the direct current biasing processing (DC-SHIFT) then; Hereinafter to be referred as: CP), be modulated to radio-frequency transmissions and get final product.
Because the data subcarrier quantity that every transmit antennas sends is the 1/M that single antenna sends; Therefore under the constant prerequisite of every transmitting antenna gross power; Each " preamble " sub-carrier power is M a times that the employing single antenna sends sub-carrier power; Thereby increase base station down channel, for example coverage of synchronous/broadcasting/control channel and lifting subscriber equipment received signal to noise ratio guarantee that subscriber equipment carries out reliable decoding to synchronous/broadcasting/control information of base station transmission; Increase cell edge and cover, promote throughput.
When the base station adopts the foregoing description method to send " preamble " signal, for the UE side, can adopt prior art that " preamble " signal that receives is estimated, just can realize accurate reception, need not make any change.
Fig. 5 is subcarrier sending method embodiment two flow charts of the present invention; Fig. 6 is subcarrier sending method embodiment of the present invention antenna more than two subcarrier distribution scheme sketch map; Like Fig. 5 and shown in Figure 6; FCH and DL_MAP signal that the multi-antenna omnidirectional wave beam formation method that present embodiment provides is sent in the OFDMA frame structure with base station in the WiMAX system are that example describes, and specifically comprise:
Step 200; To be positioned at signal several subcarriers on whole frequency that use the parton channel to arrange the territory and be divided into several physical cluster; Make all to include pilot sub-carrier in each physical cluster that said pilot sub-carrier is used for the channel information that supplies subscriber equipment to carry out channel estimating and obtain said physical cluster data subcarrier;
Step 201; Mapping relations according to Logic Cluster and said physical cluster; Rearrangement is positioned at uses the parton channel to arrange several subcarriers of signal on whole frequency in territory, and is that unit broadcasts transmission with said several subcarrier mean allocation to the M transmit antennas of base station with said Logic Cluster.
Describe as being positioned at the example that uses the parton channel to arrange the signal in territory with FCH and DL_MAP signal in the present embodiment.
FCH and DL_MAP are arranged in first use parton channel (Partial Usage of Sub-channels of downlink OFDMA frame structure; Hereinafter to be referred as: PUSC) arrange in the territory.On logical frame, FCH is positioned at preceding four gaps (slots) of its corresponding " segment " beginning, and DL_MAP preferentially arranges according to frequency following closely.Plan is carried out many antennas subcarrier allocation on physical frame, FCH and DL_MAP signal are divided into several physical cluster.Owing to be positioned at the data that PUSC arranges the territory, subscriber equipment need utilize the locational pilot tone of each physical cluster internal fixation to carry out channel estimating to it bunch to be unit, and the linear interpolation channel and the channel of extrapolating.Therefore, the data that need assurance to be positioned at same physical cluster are dispensed on the same transmit antennas launches.Concrete mode is following: at first; According to agreement regulation according to mapping relations with FCH and DL_MAP information mapping on logical frame; After process Logic Cluster (1ogical cluster) is reset to physical cluster (physical cluster) PUSC; To comprise pilot tone at interior subcarrier bunch to be unit, mean allocation is given the M transmit antennas of base station end.
Below describe for example; As shown in table 1; System parameters 10MHz bandwidth 1024-FFT for example, FCH and DL_MAP signal have 840 pilot tones and data subcarrier (individual for " 841 " in the table 1, that 1 direct current subcarrier is wherein arranged) on whole frequency; Can be divided into 60 physical cluster, and include pilot sub-carrier in each physical cluster and supply subscriber equipment to carry out channel estimating.According to the mapping relations of Logic Cluster and physical cluster, upgraded the mapping relations of Logic Cluster and physical cluster by " rearrangement order " in the protocol tables 1, reset this 840 number of sub-carrier.Suppose that the FCH signal takies preceding 4 Logic Cluster of logical frame, promptly when sending the FCH data, the subcarrier that is sent is an included subcarrier among Logic Cluster LC0, LC1, LC2 and LC3 difference corresponding physical bunch PC6, PC48, PC37 and the PC21.
Table 1
Parameter Value
Left side protection subcarrier 92
Right protection subcarrier 91
The number of subcarriers of using 841
The rearrangement order 6,48,37,21,31,40,42,56,32, 47,30,33,54,18,10,15,50, 51,58,46,23,45,16,57,39, 35,7,55,25,59,53,11,22,38, 28,19,17,3,27,12,29,26,5, 41,49,44,9,8,1,13,36,14, 43,2,20,24,52,4,34,0
Every bunch of number of subcarriers 14
Bunch quantity 60
By on can know when the multiple transmit antennas omni-beam forms the every transmit antennas subcarrier of scheme average power and sends for the single transmit antenna omnidirectional under the constant prerequisite of single transmit antenna gross power M times.Can guarantee that the data that are positioned at same physical cluster that subscriber equipment is received send out by same foundation station transmitting antenna; Thereby make subscriber equipment be able to its pilot tone carry out channel estimating and through interior insert with extrapolation estimation bunch in other subcarrier channel estimation; In the average sub-carrier power of receiving terminal M lifting is doubly arranged on the other hand; Thereby increase base station down synchronously/broadcasting/control channel coverage and lifting subscriber equipment received signal to noise ratio; Guarantee that subscriber equipment carries out reliable decoding to the synchronous/broadcasting/control information of base station, increase cell edge and cover, promote throughput.
Above embodiment introduction be the processing mode of base station side.For subscriber equipment; Because FCH and DL_MAP signal are launched according to the PUSC arrangement mode; So subscriber equipment is when estimating channel; Channel information on the data subcarrier should be tried to achieve by slotting in the pilot frequency channel information in each physical cluster and extrapolation, and can not between physical cluster, interpolation carry out channel estimating.Utilize many antennas to carry out the average transmit power that omni-beam broadcasting can improve each subcarrier; Thereby obtain bigger signal to noise ratio at subscriber equipment; And whether for subscriber equipment for be transparent in the base station if adopting many antennas to carry out omni broadcast emission; It is irrelevant to be whether receiving terminal processing mode and base station end adopt many antennas to launch, thereby can avoid subscriber equipment is made any change.
More than among each embodiment when sending several subcarriers on whole frequency of signal to be sent through multiple transmit antennas broadcasting; Can also switch to send with antenna and combine; Promptly adopt transmitting antenna to switch the mode of sending and broadcast the transmission subcarrier, can further promote the performance that descending multi-antenna omnidirectional wave beam forms.
Fig. 7 is that antenna switches sketch map in the embodiment of the invention; Present embodiment is that example describes with " Preamble " signal that in the WiMAX system, sends in the OFDMA frame structure, and each radio frames of M section " Preamble " sequence of separating on the frequency domain adopts the different antennas switching pattern to send.The benefit of bringing like this has the power gain that adopts in the multi-antenna omnidirectional wave beam scheme on the one hand, has a day line options gain also to can be described as the frequency hopping gain on the other hand, can further promote descending omnidirectional channel performance.
Described antenna switching is meant; In radio communication, the fading characteristic of wireless channel makes wireless signal deep fade in short-term may occur, in the system that adopts many antenna emissions; Transmitter side sends signal to same user through each exchange different antennas; To avoid in a plurality of transmitting antennas one or more antenna channels to decline bigger always, can offset the influence of part decline like this, brings the antenna handoff gain.Described antenna switching pattern refers to how to select the antenna switching mode to send data at every turn, and such as in embodiments of the present invention, when adopting four antenna transmission data, identical frequency domain data can be by antenna { 0; 1,2, the order of 3} is switched transmission successively; Also can be by { 0,2,3; The mode of 1} is switched, or other, the switching mode in { ... } is exactly a switching pattern.
The pattern that antenna switches can have kinds of schemes, and present embodiment is just listed and enumerated a kind of simple proposal so that explanation is suitable for FCH and DL_MAP code book embodiment certainly too.
Above embodiment only is that first three " OFDM symbol " signal that sends in the downlink information frame with broadcasting is that example describes, but is not limited to this.
Can adopt circulation delay diversity (Cyclic Delay Diversity among the WiMAX; Hereinafter to be referred as: CDD) carry out " OFDM symbol " signals of many antenna transmission, the scheme that also can adopt the embodiment of the invention to provide is carried out omni-beam and is formed and send.CDD is WiMAX or Long Term Evolution (Long TermEvolution; Hereinafter to be referred as: a kind of many antenna transmission mode that adopts LTE); Its principle is to send a plurality of duplicates that recycling-guard prefix (CP) difference comprises identical information respectively through a plurality of antennas to come the simulating multi-path signal, and receiving terminal adopts similar multipath to merge principle and promotes demodulation performance.
In addition, (the Physical Broadcast Channel of the Physical Broadcast Channel among the LTE; Hereinafter to be referred as: PBCH) and synchronizing channel (Synchronization Channel; Hereinafter to be referred as: SCH) wait the scheme that also can adopt the embodiment of the invention to provide; Increase the channel coverage through power gain; Solve cell edge synchronously/broadcast/control limited problem; Guarantee that subscriber equipment carries out reliable decoding to synchronous/broadcasting/control information of base station transmission, increase cell edge and cover and the lifting throughput.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 8 is an embodiment of the invention architecture of base station sketch map; As shown in Figure 8; This base station comprises allocation process module 11 and M transmit antennas 12 (M >=2); Wherein allocation process module 11 is used for signal to be sent several subcarriers on whole frequency are divided into several transmission groups, and to be unit with the transmission group give the M transmit antennas 12 of base station with signal to be sent several subcarrier allocation on whole frequency; Transmitting antenna 12 is used for the subcarrier that allocation process module 11 is distributed is broadcasted transmission.
The base station that present embodiment provides is suitable for broadcasting and sends first three " OFDMsymbol " signal in the downlink information frame; Allocation process module 11 can comprise that first division unit and first allocation units are to be suitable for sending " Preamble " signal; First division unit in the allocation process module 11 evenly is divided into M transmission group with several subcarrier orders that " Preamble " signal is evenly distributed on the whole frequency, and first allocation units subcarrier that each transmission group is included sends to transmitting antenna corresponding with this transmission group in the M transmit antennas 12; The subcarrier that is comprised by 12 pairs of transmission groups of transmitting antenna of correspondence then adds the edge protection tape handling successively, Fourier inversion is handled and add circulation prefix processing, and broadcasts transmission after being modulated to radio frequency.
In addition; Allocation process module 11 can comprise that second division unit, rearrangement unit and second allocation units are to be suitable for sending FCH and DL_MAP signal; Second division unit in the allocation process module 11 will be positioned at uses the FCH and several subcarriers of DL_MAP signal on whole frequency in PUSC row territory to be divided into several physical cluster; Make all to include pilot sub-carrier in each physical cluster that this pilot sub-carrier is used for the channel information that supplies subscriber equipment to carry out channel estimating and obtain said physical cluster data subcarrier; Then, use PUSC to arrange several subcarriers of signal on whole frequency in territory through resetting the mapping relations of unit, reset to be positioned at according to Logic Cluster and said physical cluster; At last, being unit with the Logic Cluster through second allocation units gives the M transmit antennas 12 of base station with several subcarrier mean allocation, and the subcarrier that distributes of 12 pairs of allocation process modules of transmitting antenna 11 is broadcasted transmission then.
The base station that above-mentioned each embodiment provides comprises that also control module 13 is used to control transmitting antenna 12 and adopts transmitting antenna to switch the mode of sending, and signal to be sent several subcarriers on whole frequency are sent in broadcasting.Present embodiment through control module 13 the multi-antenna omnidirectional wave beam is sent and the antenna switching combines, and makes each radio frames of same frequency position data carry out antenna and switches the transmission of selection different antennae.Can think that also the data of each antenna transmission carry out frequency hopping on each radio frames, can extraly bring certain sky line options gain or frequency handoff gain like this.
More than in the base station that provides of each embodiment the function and cooperatively interacting of each module accomplish that information broadcast sends can be referring to the related content among the said method embodiment; This base station not only can be broadcasted first three signal message of downlink OFDMA frame; Can also broadcast only adopting the omnidirectional channel of single antenna in the OFDMA system; Thereby increase base station down synchronously/broadcasting/control channel coverage and lifting subscriber equipment received signal to noise ratio; Guarantee that subscriber equipment carries out reliable decoding to synchronous/broadcasting/control information of base station transmission, increase cell edge and cover and the lifting throughput.
The embodiment of the invention also provides a sub-carrier transmitting system; Comprise base station and the subscriber equipment that is used to receive the subcarrier that said base station broadcast sends; The base station that wherein related base station can adopt above embodiment to provide, its 26S Proteasome Structure and Function repeats no more here.In the system that present embodiment provides; The base station can increase down-going synchronous/broadcasting/control channel coverage and promote the subscriber equipment received signal to noise ratio; Guarantee that subscriber equipment carries out reliable decoding to synchronous/broadcasting/control information of base station transmission, increase cell edge and cover and the lifting throughput.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.

Claims (6)

1. a sub-carrier sending method is characterized in that, comprising:
Signal to be sent several subcarriers on whole frequency are divided into several transmission groups, are that unit broadcasts transmission for the M transmit antennas of base station said signal to be sent several subcarrier allocation on whole frequency with said transmission group, wherein M >=2; Said method specifically comprises:
To be positioned at signal several subcarriers on whole frequency that use the parton channel to arrange the territory and be divided into several physical cluster; Make all to include pilot sub-carrier in each said physical cluster that said pilot sub-carrier is used for the channel information that supplies subscriber equipment to carry out channel estimating and obtain said physical cluster data subcarrier;
Mapping relations according to Logic Cluster and said physical cluster; Rearrangement is positioned at uses the parton channel to arrange several subcarriers of signal on whole frequency in territory, and is that unit broadcasts transmission with said several subcarrier mean allocation to the M transmit antennas of base station with said Logic Cluster.
2. subcarrier sending method according to claim 1 is characterized in that, said method also comprises:
Several subcarriers order that signal to be sent is evenly distributed on the whole frequency evenly is divided into M transmission group, and the included subcarrier of each said transmission group is sent in the M transmit antennas and the corresponding transmitting antenna of said transmission group;
Through with the corresponding transmitting antenna of said transmission group, the included subcarrier of each self-corresponding transmission group is added edge protection tape handling, Fourier inversion successively handles and add circulation prefix processing, and broadcast transmission after being modulated to radio frequency.
3. subcarrier sending method according to claim 1 and 2 is characterized in that, said method also comprises:
Adopt transmitting antenna to switch the mode of sending, said signal to be sent several subcarriers on whole frequency are sent in broadcasting.
4. a base station is characterized in that, comprising:
The allocation process module; Be used for signal to be sent several subcarriers on whole frequency are divided into several transmission groups; And to be unit with said transmission group give the M transmit antennas of base station, wherein M >=2 with said signal to be sent several subcarrier allocation on whole frequency;
Transmitting antenna is used for the subcarrier of said allocation process module assignment is broadcasted transmission;
Wherein, said allocation process module comprises:
Second division unit; Be used for to be positioned at signal several subcarriers on whole frequency that use the parton channel to arrange the territory and be divided into several physical cluster; Make each physical cluster all include pilot sub-carrier, said pilot sub-carrier is used for the channel information that supplies subscriber equipment to carry out channel estimating and obtain said physical cluster data subcarrier;
Reset the unit, be used for mapping relations, reset to be positioned at and use the parton channel to arrange several subcarriers of signal on whole frequency in territory according to Logic Cluster and said physical cluster;
Second allocation units, being used for said Logic Cluster is the M transmit antennas that unit gives said several subcarrier mean allocation the base station.
5. base station according to claim 4 is characterized in that, also comprises:
Control module is used to control said transmitting antenna and adopts transmitting antenna to switch the mode of sending, and said signal to be sent several subcarriers on whole frequency are sent in broadcasting.
6. a sub-carrier transmitting system comprises like claim 4 or 5 described base stations and the subscriber equipment that is used to receive the subcarrier that said base station broadcast sends.
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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101635619B (en) * 2009-08-28 2012-09-05 华为技术有限公司 Method, base station and system for transmitting subcarriers
CN102238109B (en) * 2010-04-22 2015-06-10 中兴通讯股份有限公司 Channel estimation method and device
CN102098775A (en) * 2010-11-23 2011-06-15 中国人民解放军信息工程大学 Self-adaptive bit power allocating method and system of molecular band
CN102264136B (en) * 2011-08-08 2017-02-15 中兴通讯股份有限公司 Method and device for controlling configuration of channel resources
CN105553631B (en) * 2012-03-23 2018-09-21 广东新岸线计算机系统芯片有限公司 A kind of data transmission method, transmitting website and receiving station based on OFDM
US9325463B2 (en) * 2013-11-19 2016-04-26 Intel IP Corporation High-efficiency WLAN (HEW) master station and methods to increase information bits for HEW communication
EP3902192B1 (en) 2014-06-12 2023-05-03 Huawei Technologies Co., Ltd. System and method for ofdma tone allocation in next generation wi-fi networks
CN105262525B (en) * 2015-09-15 2019-04-05 清华大学 Multi-input multi-output orthogonal frequency division multiplexing system subcarrier sub-clustering method for precoding
US10904784B2 (en) 2016-06-15 2021-01-26 Qualcomm Incorporated Beam reporting and scheduling in multicarrier beamformed communications
CN107889121B (en) * 2016-09-30 2022-10-18 中兴通讯股份有限公司 Method and device for covering broadcast

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007259044A (en) * 2006-03-23 2007-10-04 Mitsubishi Electric Corp Wireless communication system
EP1876785A2 (en) * 2004-02-14 2008-01-09 Samsung Electronics Co., Ltd. Channel state information feedback method for multi-carrier communication system
CN101485106A (en) * 2006-07-11 2009-07-15 诺基亚公司 Data transmission method, base station and user transceiver

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100705448B1 (en) * 2005-12-09 2007-04-09 한국전자통신연구원 Method and system for allocation of transmission power using channel information of code-book in ofdm with multiple transmission antennas
CN101039136B (en) * 2006-03-15 2011-09-14 华为技术有限公司 Space-frequency coding-based multi-antenna transmitter diversity method and system thereof
US8305949B2 (en) * 2006-09-11 2012-11-06 Apple Inc. System and method for spatial multiplexing-based OFDM broadcast/multicast transmission
CN101282150B (en) * 2007-04-03 2013-06-05 中兴通讯股份有限公司 Transmission method capable of improving OFDMA system prefix sequence
CN101488837B (en) * 2008-01-16 2011-09-14 华为技术有限公司 Multicast broadcast service data sending method and wireless sending device
CN101635619B (en) * 2009-08-28 2012-09-05 华为技术有限公司 Method, base station and system for transmitting subcarriers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1876785A2 (en) * 2004-02-14 2008-01-09 Samsung Electronics Co., Ltd. Channel state information feedback method for multi-carrier communication system
JP2007259044A (en) * 2006-03-23 2007-10-04 Mitsubishi Electric Corp Wireless communication system
CN101485106A (en) * 2006-07-11 2009-07-15 诺基亚公司 Data transmission method, base station and user transceiver

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