CN101741797B - Method and device for transmitting multi-antenna broadcast - Google Patents
Method and device for transmitting multi-antenna broadcast Download PDFInfo
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- CN101741797B CN101741797B CN 200810219373 CN200810219373A CN101741797B CN 101741797 B CN101741797 B CN 101741797B CN 200810219373 CN200810219373 CN 200810219373 CN 200810219373 A CN200810219373 A CN 200810219373A CN 101741797 B CN101741797 B CN 101741797B
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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Abstract
The embodiment of the invention provides a method for transmitting a multi-antenna broadcast which comprises the steps of: performing channel coding on at least two business data flows, performing layering modulation multiplexing on channel coded business data flows in order to form a one-way business data flow, transmitting and diversifying the multiplexed business data flow in order to acquire a multi-path data corresponding to the number of the transmitting antenna, and then transmitting the multi-path data to a corresponding transmitting antenna. The embodiment of the invention further provides a device for transmitting multi-antenna broadcast. The embodiment of the invention adopts a multi-antenna technique in broadcasting channels, promotes a signal to noise ratio of the receiver by transmitting and diversifying, combines layering modulation with MIMO and promotes the channel capacity and frequency spectrum efficiency.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of sending method and device of multi-antenna broadcast.
Background technology
Multiple-input and multiple-output (Multi-Input Multi-Output, MIMO) technology is that the third generation and future mobile communication system are realized high data rate, large power system capacity, improves the important technology of transmission quality.This technology can improve capacity and the availability of frequency spectrum of communication system exponentially in the situation that does not increase bandwidth.
The core of mimo system is to utilize many antennas to suppress channel fading.Usually, multipath will cause decline, thereby is regarded as adverse factor.But for mimo system, multipath can be used as a favorable factor and is used.Figure 1 shows that the schematic diagram of mimo system.Flow of transmitted information s (k) forms N information subflow c through Space Time Coding
i(k), i=1 ..., N.This N subflow is gone out by N antenna transmission, is received by M reception antenna behind space channel.Multi-aerial receiver utilizes Space Time Coding to process these substream of data that can separate and decode, thereby realizes best processing.N subflow of emission sends to channel simultaneously, and takies identical frequency band, thereby do not increase bandwidth.If the channel response between each transmit receive antenna is independent, then mimo system can be created a plurality of parallel spatial channels.If pass through independently transmission information of these parallel spatial channels, data transfer rate can improve; If by the identical information of these parallel spatial transmissions, then can obtain space diversity gain, performance can improve.The mode of obtaining space diversity of commonly using at present is block code (Spatial Time Block Code, STBC) at one's leisure, the modes such as space-frequency block codes (Spatial Frequency BlockCode, SFBC).
The characteristics of broadcast channel are the down links of point-to-multipoint transmission.Its typical scene is in the residential quarter, and a base station and a plurality of portable terminal are arranged, and the base station sends broadcast singal simultaneously to a plurality of portable terminals.When the base station sends broadcast singal, and do not know the information of portable terminal, such as the number of portable terminal, the channel conditions of portable terminal etc.At present, broadcast channel only considers that single antenna sends, and along with the development of the communication technology, the particularly proposition of MIMO technology considers that in broadcast channel many antennas send, and improves performance and spectrum efficiency, has become study hotspot.
Level modulation (Hierarchy Modulation, HM) be a kind of enhancement mode modulation technique, be moved ultra broadband (Ultra Mobile Broadband, UMB), digital video broadcasting (Digital VideoBroadcasting, DVB), the standard such as MediaFLO (Qualcomm propose mobile TV standard) is adopted.Level is modulated at can obtain maximum broadcast channel capacity under the single antenna scene, obtain in other words conj.or perhaps one of best mode of broadcast channel capacity.
HM typically realizes block diagram as shown in Figure 2:
Two different Business Streams (Business Stream 1 and Business Stream 2) after chnnel coding, carry out the data of two different business streams multiplexing through the level modulation.Multiplexing mode can be given Business Stream 2 to 1, two low bit of reliability of Business Stream by high bit with two reliabilitys of 16QAM (QuadratureAmplitude Modulation, quadrature amplitude modulation); Perhaps, after two different Business Streams carry out Quadrature Phase Shift Keying (Quadrature Phase Shift Keying, QPSK) modulation, by different power and phase control, be superimposed, finish the multiplexing of different business data flow.
Yet the inventor finds, does not introduce multi-antenna technology in present broadcast channel, causes performance and spectrum efficiency not high; The level modulation does not have combination with MIMO yet, obtains maximum broadcast channel capacity under the single antenna scene so that the level modulation can only be satisfied.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of sending method and device of multi-antenna broadcast, and the level modulation is combined with MIMO, improves channel capacity and spectrum efficiency.
The embodiment of the invention provides a kind of sending method of multi-antenna broadcast, comprising:
At least two business data flows are carried out respectively chnnel coding;
Be one road business data flow with the business data flow after the described chnnel coding by the level modulation multiplex;
Business data flow after multiplexing is carried out transmit diversity process, obtain the multichannel data corresponding with number of transmit antennas;
Described multichannel data is sent to corresponding transmitting antenna.
The embodiment of the invention also provides a kind of dispensing device of multi-antenna broadcast, comprising:
Channel coding module is used at least two business data flows are carried out respectively chnnel coding;
The level modulation module is used for the business data flow after the described chnnel coding is multiplexed with one road business data flow;
The transmit diversity module is used for that the business data flow after multiplexing is carried out transmit diversity and processes, and obtains the multichannel data corresponding with number of transmit antennas;
At least two secondary transmitting antennas are used for sending described multichannel data to receiving terminal.
The embodiment of the invention is introduced multi-antenna technology under the broadcast channel, and the mode of employing transmit diversity improves the signal to noise ratio of receiver, and the level modulation is combined with MIMO, has improved channel capacity and spectrum efficiency.
Description of drawings
Fig. 1 is the fundamental block diagram of prior art mimo system;
Fig. 2 is the schematic diagram of prior art level modulation;
Fig. 3 is the schematic flow sheet of the sending method of the embodiment of the invention one multi-antenna broadcast;
Fig. 4 is 16QAM rule planisphere and mapping mode schematic diagram thereof in the embodiment of the invention one;
Fig. 5 is that two-layer QPSK superposes and planisphere and the mapping mode schematic diagram thereof of formation in the embodiment of the invention one;
Fig. 6 is the schematic diagram that adopts the Alamouti method to process for 2 secondary transmitting antennas in the embodiment of the invention one;
Fig. 7 is the schematic diagram that postpones transmit diversity in the embodiment of the invention one;
Fig. 8 is the schematic diagram of angular deflection transmit diversity in the embodiment of the invention one;
Fig. 9 is the schematic flow sheet of the sending method of the embodiment of the invention two multi-antenna broadcasts;
Figure 10 is the schematic flow sheet of the sending method of the embodiment of the invention three multi-antenna broadcasts;
Figure 11 is the structural representation of the dispensing device of the embodiment of the invention four multi-antenna broadcasts;
Figure 12 is the improved structural representation of the dispensing device of multi-antenna broadcast in the embodiment of the invention four;
Figure 13 is the further improved structural representation of the dispensing device of multi-antenna broadcast in the embodiment of the invention four.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
The embodiment of the invention one:
Please refer to shown in Figure 3ly, the sending method of the embodiment of the invention one multi-antenna broadcast comprises:
Relate to the individual business data flow of N (N 〉=2) in the present embodiment, chnnel coding includes but not limited to: Turbo code, LDPC code (low density parity check code) or convolution code etc.The channel coding method that the different business data flow is chosen can be identical, also can be different.
In the present embodiment, the mode of level modulation includes but not limited to: (1) distributes to different Business Streams with the bit bit of the Different Reliability of rule or irregular QAM; Perhaps (2) adopt basic modulation system with the Business Stream of different layers, such as QPSK, by different power or angular stack.
For mode (1), take regular QAM as example, the high-order modulating of a kind of present employing of regular QAM, Figure 4 shows that the regular 16QAM modulation system (referring to comprise the qam mode of 16 kinds of symbols) that adopts among the UMB, constellation is shaped as square, and the distance between adjacent row and adjacent row equates.
For mode (2), after the Business Stream of different layers adopts the QPSK modulation, by obtaining planisphere (from UMB) behind different power or the angular stack, as shown in Figure 5, α is the amplitude of the first Business Stream, and β is the amplitude of the second Business Stream, and θ is the angle between two-layer Business Stream.
In the present embodiment, transmit diversity includes but not limited to: space-time block code STBC or space-frequency block codes SFBC, postpone the combination etc. between transmit diversity, angular deflection transmit diversity, time-switching transmit diversity or frequency switched transmit diversity or different transmit diversity.The below introduces respectively.
1, space-time block code STBC or space-frequency block codes SFBC
Space-time block code is identical with the space-frequency block codes basic principle, and space-time block code is that signal is put into two dimensions of room and time, and space-frequency block codes is that signal is put into space and two dimensions of frequency domain, and the method for putting all is identical.
For example, for the diversity mode of 2 secondary transmitting antennas, the processing mode of Alamouti method (refering in particular to space-time block code or the space-frequency block codes of 2 secondary transmitting antennas) as shown in Figure 6, the symbol of input is s
1, s
2, for antenna 1, the symbol of output is [s
1,-
], for antenna 2, the symbol of output is [s
2,
], if the symbol of output is exactly space-time block code at different time dimensions, if be exactly space-frequency block codes in different frequencies.
In the present embodiment, business data flow after multiplexing is utilized coding implementation space diversity and time diversity on the room and time, utilize coding implementation space diversity and frequency diversity on space and the frequency, thereby reduction channel bit error rate, under 2 secondary transmitting antenna scenes, can obtain higher diversity gain.
2, postpone transmit diversity
Postpone transmit diversity as shown in Figure 7, it is to be the copy of different delay with multiplexing business data flow diversity, sends in different antennae.For example, for antenna 1, constantly send at t1; For antenna 2, postpone Δ t, t sends constantly at the t1+ Δ; For antenna k, then postpone (k-1) * Δ t, t sends constantly at t1+ (k-1) * Δ.
3, angular deflection transmit diversity
The angular deflection transmit diversity as shown in Figure 8, it is to be the copy of different angles with multiplexing business data flow diversity, sends in different antennae.For example, for antenna 2, send in the angle upper deflecting θ of antenna 1 angle; For antenna k, deflection θ then
K-1Angle sends.
4, select transmit diversity
Select transmit diversity to generally include time-switching transmit diversity, frequency switched transmit diversity, when transmitting terminal is not known channel information, transmitting terminal can be chosen randomly antenna and send, selecting at random in time to send is exactly the time-switching transmit diversity, and selecting in frequency is exactly the frequency switched transmit diversity.
5, the combination between different transmit diversities
According to the description of aforementioned 4 kinds of transmit diversities, the below briefly introduces with the example that is combined into of space-time block code and time-switching transmit diversity, and those skilled in the art understand and can freely select the combination of other any transmit diversities.
Choose at random antenna in the different time and send (time-switching transmit diversity), for example t1 chooses antenna 1 transmission constantly, and t2 constantly chooses antenna 2 and sends; And when t1 is sent by antenna 1 constantly, adopt again the mode of space-time block code, utilize coding implementation space diversity and time diversity on the room and time; When t2 is sent by antenna 2 constantly, also adopt the mode of space-time block code, utilize coding implementation space diversity and time diversity on the room and time.
Obtain the multichannel data corresponding with number of transmit antennas through the transmit diversity processing, will send to corresponding transmitting antenna to send to the recipient.The sending method that should be appreciated that the present embodiment multi-antenna broadcast is not only applicable to the situation that recipient's (for example portable terminal) has the reception antenna more than 2 or 2, also is applicable to the only situation of 1 reception antenna of recipient.
The embodiment of the invention is introduced multi-antenna technology under the broadcast channel, and the mode of employing transmit diversity improves the signal to noise ratio of receiver, and the level modulation is combined with MIMO, has improved channel capacity and spectrum efficiency.
The embodiment of the invention two:
Please refer to shown in Figure 9, the sending method of the embodiment of the invention two multi-antenna broadcasts is with OFDM (Orthogonal Frequency Division Multiplexing, OFDM) combines with MIMO, be with the difference of embodiment one, in the present embodiment, with the business data flow after multiplexing by transmit diversity process obtain the data corresponding with at least two secondary transmitting antennas after, be not directly to send to transmitting antenna, but first through the OFDM modulation, send to again transmitting antenna.
Step 91-93 is identical with step 31-33 among the embodiment one, and this does not give unnecessary details.
The OFDM modulation can be divided into channel some orthogonal sub-channels, converts high-speed data signal to parallel low speed sub data flow, is modulated at every sub-channels and transmits.The smaller bandwidth of every sub-channels, therefore the flatness of can regarding as on every sub-channels declines, thereby can suppress intersymbol interference, with the well combination of many antennas.
As further improvement of this embodiment, after step 91 pair at least two business data flows carry out chnnel coding respectively, also comprise step:
Business data flow after the described chnnel coding is carried out respectively interleaving treatment.
Interleaving treatment is by the business data flow code word after the upset chnnel coding sequentially relevant irrelevantization of bit, randomization, do not increase in the situation of any expense and obtain time diversity, so that level when modulation is multiplexing, interleaving mode to each road business data flow can be identical, also can be not identical.
Through after the interleaving treatment, execution in step 92 again, are circuit-switched data stream with described business data flow by the level modulation multiplex.
Present embodiment combines OFDM with MIMO, not only can improve diversity gain and channel capacity, and utilizes OFDM that frequency selective fading is converted to flat fading on the subcarrier, can eliminate intersymbol interference.
The embodiment of the invention three:
Please refer to shown in Figure 10, the sending method of the embodiment of the invention three multi-antenna broadcasts and the difference of embodiment two are, in the present embodiment, with the business data flow after multiplexing by transmit diversity process obtain the data corresponding with at least two secondary transmitting antennas after, first through inserting the mapping of pilot tone and carrier wave, carry out again the OFDM modulation, then just send to transmitting antenna.
Step 101 is carried out respectively chnnel coding at least two business data flows.
Step 102 is one road business data flow with the business data flow after the described chnnel coding by the level modulation multiplex.
Step 103 is carried out transmit diversity with the business data flow after multiplexing and is processed, and obtains the multichannel data corresponding with number of transmit antennas.
Step 101-103 is identical with step 91-93 among the embodiment two, and this does not give unnecessary details.
Step 104 is inserted respectively pilot tone and carrier wave mapping to described multichannel data.
The carrier wave mapping then is that each circuit-switched data is mapped as respectively the OFDM symbol, inserting pilot tone is by inserting Given information in the time/frequency source block that forms at the OFDM symbol---pilot tone, the decline situation of the whole channel time/frequency source block between estimating from the transmitting terminal to the receiving terminal according to the decline situation of pilot tone position.Pilot frequency carrier wave does not transmit any useful signal code stream, can resist various interference, channel estimating is convenient to receiving terminal can obtain the result who estimates, and can understand the distortion of frequency and the phase place of each carrier wave, then receiving terminal is proofreaied and correct signal amplitude and phase place according to these information, i.e. channel equalization.
Step 105 is basic identical with the step 94 among the embodiment two, namely the multichannel data after described insertion pilot tone and the carrier wave mapping is carried out respectively the OFDM modulation.
Step 106 is basic identical with the step 95 among the embodiment two, and the multichannel data that is about to after the OFDM modulation sends to corresponding transmitting antenna.
In like manner, as further improvement of this embodiment, after step 101 pair at least two business data flows carry out chnnel coding respectively, also comprise step:
Business data flow behind the described coding is carried out respectively interleaving treatment.
Interleaving treatment is by the business data flow code word after the upset chnnel coding sequentially relevant irrelevantization of bit, randomization, do not increase in the situation of any expense and obtain time diversity, so that level when modulation is multiplexing, interleaving mode to each road business data flow can be identical, also can be not identical.
Present embodiment combines OFDM with MIMO, not only can improve diversity gain and channel capacity, and utilizes OFDM that frequency selective fading is converted to flat fading on the subcarrier, can eliminate intersymbol interference.Simultaneously, before the OFDM modulation, also multichannel data is inserted pilot tone and carrier wave mapping processing, more be conducive to receiving terminal and carry out channel equalization.
The embodiment of the invention four:
Please refer to shown in Figure 11ly, the dispensing device of the embodiment of the invention four multi-antenna broadcasts comprises:
Relate to the individual business data flow of k (k 〉=2) in the present embodiment, chnnel coding includes but not limited to: Turbo code, LDPC code (low density parity check code) or convolution code etc.For the different business data flow, the channel coding method that channel coding module 11 is chosen can be identical, also can be different.
In the present embodiment, the mode that the level modulation module carries out the level modulation includes but not limited to: (1) distributes to different Business Streams with the bit of the Different Reliability of rule or irregular QAM; Perhaps (2) adopt basic modulation system with the Business Stream of different layers, such as QPSK, by different power or angular stack.
Transmit diversity module 13 is used for that the business data flow after multiplexing is carried out transmit diversity and processes, and obtains the multichannel data corresponding with number of transmit antennas.
In the present embodiment, transmit diversity module 13 specifically can comprise:
The space-time block code module is for coding implementation space diversity and the time diversity the business data flow after multiplexing utilized on the room and time; Or
The space-frequency block codes module is for coding implementation space diversity and the frequency diversity the business data flow after multiplexing utilized on space and the frequency; Or
Postpone the transmit diversity module, being used for multiplexing business data flow diversity is the copy of different delay, to send in different transmit antennas; Or
Angular deflection transmit diversity module, being used for multiplexing business data flow diversity is the copy of different angles, to send in different transmit antennas; Or
Time-switching transmit diversity module is used for selecting at random in time transmitting antenna to send; Or
Frequency switched transmit diversity module is used for selecting at random transmitting antenna to send in frequency.
In the practical application scene, transmit diversity module 13 can be specially above-mentioned arbitrary diversity module or the arbitrarily combination of diversity module.
At least two secondary transmitting antennas 14 are used for sending described multichannel data to receiving terminal.
In the present embodiment, number of transmit antennas is N (N 〉=2), and this transmission by many antennas can the establishment channel fading.
Please refer to shown in Figure 12ly, as to further improvement of this embodiment, the dispensing device of multi-antenna broadcast also comprises again:
Modulating in OFDM module 15 is located between described transmit diversity module 12 and the transmitting antenna 14, is used for that described transmit diversity module 12 diversity are processed the multichannel data that obtains and carries out respectively the OFDM modulation.
The OFDM modulation can be divided into channel some orthogonal sub-channels, converts high-speed data signal to parallel low speed sub data flow, is modulated at every sub-channels and transmits.The smaller bandwidth of every sub-channels, therefore the flatness of can regarding as on every sub-channels declines, thereby can suppress intersymbol interference, with the well combination of many antennas.
Also please refer to shown in Figure 13ly, as to further improvement of this embodiment, the dispensing device of multi-antenna broadcast also comprises:
Insert pilot tone and carrier wave mapping block 17, be located between described transmit diversity module 12 and the OFDM modulation module 15, be used for that described transmit diversity module 12 diversity are processed the multichannel data that obtains and be mapped as respectively the OFDM symbol, in the time/frequency source block that the OFDM symbol forms, insert pilot tone, the decline situation of the whole channel time/frequency source block between estimating from the transmitting terminal to the receiving terminal according to the decline situation of pilot tone position.So that receiving terminal carries out channel equalization according to channel estimation case.
Dispensing device for the multi-antenna broadcast shown in Figure 11-13, can also be between channel coding module 11 and level modulation module 12, interleaving block 16 is set, be used for the business data flow behind described channel coding module 11 codings is carried out respectively interleaving treatment, it is specifically by sequentially relevant irrelevantization of bit of the business data flow code word after the upset chnnel coding, to obtain time diversity, be convenient to the multiplexing of level modulation module 12.For the different business data flow, interleaving block 16 carries out the mode of interleaving treatment can be identical, also can be different
The embodiment of the invention is introduced multi-antenna technology under the broadcast channel, and the mode of employing transmit diversity improves the signal to noise ratio of receiver, and the level modulation is combined with MIMO, has improved channel capacity and spectrum efficiency.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. the sending method of a multi-antenna broadcast is characterized in that: comprising:
At least two business data flows are carried out respectively chnnel coding;
Be one road business data flow with the business data flow after the described chnnel coding by the level modulation multiplex;
Business data flow after multiplexing is carried out transmit diversity process, obtain the multichannel data corresponding with number of transmit antennas;
Described multichannel data is sent to corresponding transmitting antenna;
Wherein, the mode of described level modulation is specially one of following mode:
The bit bit of rule or the Different Reliability of irregular quadrature amplitude modulation QAM is distributed to different Business Streams; Perhaps
The Business Stream of different layers is adopted basic modulation system, by different power or angular stack.
2. method according to claim 1, it is characterized in that: the mode of described transmit diversity is specially one of following mode or combination in any:
Business data flow after multiplexing is utilized coding implementation space diversity and time diversity on the room and time; Or
Business data flow after multiplexing is utilized coding implementation space diversity and frequency diversity on space and the frequency; Or
Be the copy of different delay with multiplexing business data flow diversity; Or
Be the copy of different angles with multiplexing business data flow diversity; Or
According to the feedback of receiving terminal to the transmitting antenna channel quality, select at random transmitting antenna to send.
3. method according to claim 1 is characterized in that: the business data flow after multiplexing is carried out transmit diversity process, obtain also comprising after the multichannel data corresponding with number of transmit antennas:
Described multichannel data is carried out respectively the OFDM modulation.
4. method according to claim 3 is characterized in that: the business data flow after multiplexing is carried out transmit diversity process, obtain after the multichannel data corresponding with number of transmit antennas, before described multichannel data being carried out respectively the OFDM modulation, also comprise:
Described multichannel data is inserted pilot tone and carrier wave mapping.
5. according to claim 3 or 4 described methods, it is characterized in that: at least two business data flows are carried out respectively also comprising after the chnnel coding:
Business data flow after the described chnnel coding is carried out respectively interleaving treatment.
6. the dispensing device of a multi-antenna broadcast is characterized in that: comprising:
Channel coding module is used at least two business data flows are carried out respectively chnnel coding;
The level modulation module is used for the business data flow after the described chnnel coding is multiplexed with one road business data flow;
The transmit diversity module is used for that the business data flow after multiplexing is carried out transmit diversity and processes, and obtains the multichannel data corresponding with number of transmit antennas;
At least two secondary transmitting antennas are used for sending described multichannel data to receiving terminal;
Wherein, the described level modulation module mode of carrying out level modulation comprises:
The bit bit of rule or the Different Reliability of irregular quadrature amplitude modulation QAM is distributed to different Business Streams; Perhaps
The Business Stream of different layers is adopted basic modulation system, by different power or angular stack.
7. device according to claim 6, it is characterized in that: described transmit diversity module specifically can be:
The space-time block code module is for coding implementation space diversity and the time diversity the business data flow after multiplexing utilized on the room and time; Or
The space-frequency block codes module is for coding implementation space diversity and the frequency diversity the business data flow after multiplexing utilized on space and the frequency; Or
Postpone the transmit diversity module, being used for multiplexing business data flow diversity is the copy of different delay, to send in different transmit antennas; Or
Angular deflection transmit diversity module, being used for multiplexing business data flow diversity is the copy of different angles, to send in different transmit antennas; Or
Time-switching transmit diversity module is used for selecting at random in time transmitting antenna to send; Or
Frequency switched transmit diversity module is used for selecting at random transmitting antenna to send in frequency.
8. device according to claim 6 is characterized in that: also comprise:
The modulating in OFDM module is used for that described transmit diversity module diversity is processed the multichannel data that obtains and carries out the OFDM modulation.
9. device according to claim 8 is characterized in that: also comprise:
Insert pilot tone and carrier wave mapping block, be located between described transmit diversity module and the modulating in OFDM module, be used for that described transmit diversity module diversity is processed the multichannel data that obtains and be mapped as respectively the OFDM symbol, in the time/frequency source block that the OFDM symbol forms, insert pilot tone, so that described modulating in OFDM module is carried out the OFDM modulation to the multichannel data that inserts after the mapping of pilot tone and carrier wave, the decline situation of the whole channel time/frequency source block between estimating from the transmitting terminal to the receiving terminal according to the decline situation of pilot tone position.
10. it is characterized in that: also comprise according to claim 8 or 9 described devices:
Interleaving block is arranged between channel coding module and the level modulation module, is used for the business data flow behind the described channel coding module coding is carried out respectively interleaving treatment, is convenient to the multiplexing of level modulation module.
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| CN 200810219373 CN101741797B (en) | 2008-11-25 | 2008-11-25 | Method and device for transmitting multi-antenna broadcast |
| PCT/CN2009/074920 WO2010060355A1 (en) | 2008-11-25 | 2009-11-12 | Transmitting method and apparatus of multi-antenna broadcast |
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| WO2012023944A1 (en) * | 2010-08-20 | 2012-02-23 | The Board Of Regents Of The University Of Texas System | Inserting and decoding replicated data symbols in wireless communications |
| CN102708340B (en) * | 2012-04-19 | 2015-10-14 | 上海真灼电子技术有限公司 | The active RFID system of integrated frequency diversity and space diversity and method |
| GB2518215A (en) * | 2013-09-13 | 2015-03-18 | Univ Edinburgh | Transmission scheme for communications systems |
| US9942013B2 (en) * | 2014-05-07 | 2018-04-10 | Qualcomm Incorporated | Non-orthogonal multiple access and interference cancellation |
| CN105281864B (en) * | 2014-05-30 | 2018-10-19 | 华为技术有限公司 | A kind of data transmission method and device |
| CN105490715A (en) * | 2015-10-30 | 2016-04-13 | 青岛智能产业技术研究院 | Multi-antenna vehicle network communication method based on IEEE802.11p standard |
| CN107294581A (en) * | 2016-03-30 | 2017-10-24 | 景略半导体(上海)有限公司 | Multi-antenna transmission, single antenna reception, multi-aerial transmission system and method |
| CN113038433A (en) * | 2021-02-26 | 2021-06-25 | 广东以诺通讯有限公司 | Method and system for radio resource sharing and operation mode control management |
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| EP1185048A2 (en) * | 2000-09-01 | 2002-03-06 | Nortel Networks Limited | Preamble design for multicarrier transmission over channels with multiple inputs and outputs |
| CN1886925A (en) * | 2003-09-25 | 2006-12-27 | 高通股份有限公司 | Hierarchical coding with multiple antennas in a wireless communication system |
| CN101018105A (en) * | 2006-10-22 | 2007-08-15 | 北京创毅视讯科技有限公司 | A classified modulating mobile digital multimedia broadcast signal transmission system and method |
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| CN101741797A (en) | 2010-06-16 |
| WO2010060355A1 (en) | 2010-06-03 |
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