CN103107837B - Data transmission method and device - Google Patents
Data transmission method and device Download PDFInfo
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- CN103107837B CN103107837B CN201110361950.3A CN201110361950A CN103107837B CN 103107837 B CN103107837 B CN 103107837B CN 201110361950 A CN201110361950 A CN 201110361950A CN 103107837 B CN103107837 B CN 103107837B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- 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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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Abstract
The embodiment of the invention discloses a kind of data transmission method and device.Described data transmission method comprises: the business datum that will send copies N time in radio frames; Respectively precoding is carried out to the business datum being replicated N time with N part precoding vector; The information of described precoding vector and the information of pilot data are included in described radio frames, and send described radio frames by least two transmitting antennas; Wherein N be more than or equal to 2 natural number.In the scheme of the embodiment of the present invention, due to the business datum that will send in radio frames repeatedly, and sent by multiple transmitting antenna after carrying out precoding, because this reducing the error rate of received data, improve data receiver performance, thus in identical transmitting power situation, increase the distance of transfer of data, also namely enhance the covering power of business.
Description
Technical field
The present invention relates to communication technical field.In particular to a kind of data transmission method and device.
Background technology
IEEE802.11 agreement comprises a lot of agreement branch, such as 802.11a, 802.11b, 802.11n, 802.11ac etc., and scene or the service application type of different drop applications are different.Such as, some supports slow data transmission, and some can support higher transfer of data; The working frequency range of some agreement is 2.4GHz, and the working frequency range of some is 5GHz, etc.Existing agreement branch is generally main is applicable to in-door covering, and covering radius is little, probably within 100 meters ~ 200 meters.Ieee standard organizes the agreement branch discussed and formulate and be called 802.11ah, this agreement branch may be used for outdoor cover, covering radius requires to support radius 1000 meters, and working frequency range is at below 1GHz, and slow data transmission and high speed data transfer can both be supported.
In radio communication, most of terminal is all use powered battery, so require that transmitting power is little, to avoid battery power consumption too fast.On the other hand, radio communication, no matter from the viewpoint of interference management or environmental radiation etc., does not allow too large transmitting power yet.But, because allowed transmitting power is less, even if transmitting terminal is with the minimum encoder bit rate coding allowed and with maximum power emission data, when covering radius increases, the signal power that receiving terminal receives may be still very little, thus cause data receiver performance (such as, error probability) not reach requirement.
Summary of the invention
A kind of data transmission method and device is provided in the embodiment of the present invention.
According to an aspect, propose a kind of data transmission method, comprising: the business datum that will send copies N time in radio frames; Respectively precoding is carried out to the business datum being replicated N time with N part precoding vector; The information of described precoding vector and the information of pilot data are included in described radio frames, and send described radio frames by least two transmitting antennas; Wherein N be more than or equal to 2 natural number.
According to another aspect, propose a kind of data transmission method, comprising: receive radio frames; Obtain the number of copy times N of the business datum comprised in described radio frames and the number M of pilot data, and the corresponding information of N part precoding vector and the information of M part pilot data; The information of described precoding vector and the information of pilot data is utilized to decode to the business datum comprised in described radio frames; Wherein said N be more than or equal to 2 natural number, M be more than or equal to 1 natural number, and N >=M.
According to another aspect, propose a kind of data sending device, comprising: copied cells, copy N time in radio frames for the business datum that will send; Precoding unit, for carrying out precoding to the business datum being replicated N time respectively with N part precoding vector; Transmitter unit, for the information of described precoding vector and the information of pilot data being included in described radio frames, and sends described radio frames by least two transmitting antennas; Wherein N be more than or equal to 2 natural number.
According to another aspect, propose a kind of data sink, comprising: receiving element, for receiving radio frames; Information acquisition unit, for the number M of the number of copy times N and pilot data that obtain the business datum comprised in described radio frames, and the corresponding information of N part precoding vector and the information of M part pilot data; Decoding unit, the information for the information and pilot data that utilize described precoding vector is decoded to the business datum comprised in described radio frames; Wherein said N be more than or equal to 2 natural number, M be more than or equal to 1 natural number, and N >=M.
In the scheme of the embodiment of the present invention, due to the business datum that will send in radio frames repeatedly, and sent by multiple transmitting antenna after carrying out precoding, because this reducing the error rate of received data, improve data receiver performance, thus in identical transmitting power situation, increase the distance of transfer of data, also namely enhance the covering power of business.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 shows the flow chart of data transmission method according to an embodiment of the invention.
Fig. 2 illustrates the frame structure of physical layer radio frames of the prior art.
Fig. 3 shows the flow chart of data transmission method according to another embodiment of the invention.
Fig. 4 shows the example utilizing two parts of precoding vectors radio frames to be carried out to precoding in an ofdm system.
Fig. 5 shows and utilizes two parts of precoding vectors to carry out another example of precoding to radio frames in an ofdm system.
Fig. 6 shows the schematic diagram of cyclic-shifted delay technology.
Fig. 7 shows the flow chart of data transmission method according to another embodiment of the invention.
Fig. 8 shows and utilizes two parts of precoding vectors to carry out another example of precoding to radio frames in an ofdm system.
Fig. 9 shows the flow chart of data transmission method according to an embodiment of the invention.
Figure 10 shows the schematic diagram of data sending device according to an embodiment of the invention.
Figure 11 shows the schematic diagram of data sink according to an embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear, complete description to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 shows the flow chart of data transmission method according to an embodiment of the invention.Visible, the method comprises the following steps.
Step 110, the business datum that will send copy N time in radio frames.At this, N be predetermined be more than or equal to 2 natural number.Business datum copies N time in a radio frames, and each data symbol that also namely business datum comprises occurs N time in radio frames.
Fig. 2 illustrates the frame structure of physical layer radio frames of the prior art.One skilled in the art will appreciate that the physical layer radio frames (also referred to as PPDU) of IEEE802.11 serial protocols roughly can be divided into control section and business datum part.Show the wireless frame structure according to 802.11a agreement on the top of Fig. 2, bottom shows the wireless frame structure according to 802.11n agreement.Usually, other parts in radio frames except business datum part are generically and collectively referred to as control section, or are called leading part (preamble).
In control section, L-STF, HT-STF (being also generically and collectively referred to as X-STF) are mainly used in supporting time synchronized and Frequency Synchronization, and automatic growth control adjustment etc.; L-LTF, HT-LTF (being also generically and collectively referred to as X-LTF) are mainly used in supporting channel estimating, also can be described as pilot data, and also can be further used for supporting time synchronized and Frequency Synchronization again; L-SIG, HT-SIG (being also generically and collectively referred to as X-SIG) are mainly used in the data volume size of indicating services data division, modulation coding mode, the transmission processing method that adopts, spatial data number adopted when comprising transmission etc. information.But in the prior art, only comprise a business datum part in a radio frames, and also only include a pilot data, for the data demodulates of business datum part.Such as according in the radio frames of 802.11n agreement, only there is a pilot data HT-LTF (may be made up of multiple OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM) symbol) for the data demodulates of business datum part; According in the radio frames of 802.11a agreement, only has a L-LTF for the data demodulates of business datum part.
In an embodiment of the present invention, the business datum that will send copies at least twice and sends in radio frames, the performance of transfer of data can be strengthened, because receiving terminal can get up carry out solution mediation decoding the data aggregate repeatedly sent, thus can power gain be obtained.
Step 120, respectively precoding is carried out to the business datum being replicated N time with N part precoding vector.
One skilled in the art will appreciate that transmitting chain (transmittingchain) number that the length of precoding vector and transmitting terminal have is relevant.Suppose that transmitting terminal has T transmitting chain, then the length of each precoding vector is T.In specific implementation, at least corresponding transmit antennas of each transmitting chain, then transmitting terminal has T root antenna (a transmitting chain can have many transmit antennas) at least.A transmitting chain generally has an aerial array (it may comprise multiple antenna), and in the prior art, the aerial array no matter transmitting chain is corresponding is actual comprises how many antennas, is usually still and is only called an antenna.In the ensuing content of the embodiment of the present invention, in order to easy description, also adopt this method of appellation, i.e. a corresponding transmitting antenna (actual capabilities are aerial arrays) of transmitting chain, T transmitting chain and T antenna have identical implication.When there being a data symbol to send, because transmitting terminal has T transmitting chain, need first a number to be transformed into T number, then the T number obtained after converting is sent respectively on T transmitting chain, wherein the process that a number becomes T number is called precoding processing.Usually, a precoding processing process number being become T number is, is multiplied with the number that the vector sum that a length is T will send.Such as, the data symbol that send is x (0), length to be the vector of T be w=trans{ [w (1) ..., w (T)] }, wherein, the transposition of trans{} representing matrix or vector; Then they are multiplied and obtain the vector that another length is T:
y＝trans{[x(0)w(1)，…，x(0)w(T)]}＝w*x(0)。
The vectorial w=trans{ that uses in usual title precoding processing process [w (1) ..., w (T)] } be precoding vector.
Suppose that receiving terminal has R receive chain, channel between transmitting terminal T transmitting chain to a receiving terminal R receive chain is H, wherein H is the matrix of the capable T row of R, i-th is classified as i-th transmitting chain divides other channel fading coefficient to R receive chain, and jth behavior T transmitting chain divides the channel fading coefficient being clipped to a jth receive chain.The data y that transmitting terminal sends is after channel, and the vector of the data composition that a receiving terminal R receive chain receives is:
y’＝trans{[y’(1)，…，y’(R)]}＝H*y＝H*w*x(0)。
Wherein y ' (i) is the data that i-th receive chain (reception antenna) receives.
As long as receiving terminal learns the channel H of the precoding vector w that transmitting terminal adopts and transmitting terminal and receiving terminal, or directly learn H*w (H*w is a length is the vector of R), just demodulation can obtain the data x (0) of actual transmission, wherein H*w is also called equivalent channel.
If in precoding vector, some component launching chain corresponding is 0, and so in fact these transmitting chains do not send data.By the situation of T antenna transmission in the embodiment of the present invention, comprise this special circumstances.
In an embodiment of the present invention, the identical precoding vector of N part can be used to carry out precoding to the business datum being replicated N time, also possible that, comprise M part precoding vector different between two at N part precoding vector, and use such N part precoding vector to carry out precoding to the business datum being replicated N time.About this situation, describe in detail in the embodiment below.
Step 130, the information of described precoding vector and the information of pilot data to be included in described radio frames, and to send described radio frames by least two transmitting antennas.One skilled in the art will appreciate that pilot data is pre-set value.By the information of the information and pilot data that comprise precoding vector in radio frames, pilot data can be utilized to estimate equivalent channel H*w or to estimate channel H, with demodulation coding business datum.Be noted that, the information of precoding vector and pilot data combination can be comprised in radio frames, such as comprise, by precoding vector, the information after precoding is carried out to pilot data, make the pilot data after receiving terminal can utilize this precoding and pre-set pilot data to obtain equivalent channel H*w, thus demodulation coding business datum.Also possible that, the information of precoding vector is directly comprised in radio frames, and comprise the information of pilot data, make receiving terminal can utilize receive not by precoding, through the pilot data of transmission and pre-set pilot data to obtain channel H, thus utilize channel H and precoding vector to carry out demodulation coding business datum.About both of these case, will specifically be described in the following embodiments.
After in the described radio frames of generation, send described radio frames by least two transmitting antennas.
Owing to sending radio frames by least two transmitting antennas, make radio frames arrive receiving terminal by different channels, obtain diversity gain, effectively suppress the impact of the channel fading in transmission channel.
It is emphasized that mention here at least two antennas are for radio frames, for each data symbol, do not require necessarily to be launched by least two antennas.
In the scheme of the embodiment of the present invention, due to the business datum that will send in radio frames repeatedly, and sent by multiple transmitting antenna after carrying out precoding, because this reducing the error rate of received data, improve data receiver performance, thus in identical transmitting power situation, increase the distance of transfer of data, also namely enhance the covering power of business.
Fig. 3 shows the flow chart of data transmission method according to another embodiment of the invention.Visible, the method comprises the following steps.
Step 310, the business datum that will send copy N time in radio frames.At this, N be predetermined be more than or equal to 2 natural number.Business datum copies N time in a radio frames, and each data symbol that also namely business datum comprises occurs N time in radio frames.This step is corresponding with the step 110 of method described in conjunction with Figure 1 above, repeats no more here.
Step 320, respectively precoding is carried out to the business datum being replicated N time with N part precoding vector, in N part precoding vector, wherein has M part precoding vector different between two, M be more than or equal to 2 natural number and N >=M >=2.
As illustrated in the step 120 of method described in conjunction with Figure 1 above, the transmitting chain number that length and the transmitting terminal of precoding vector have is relevant.Suppose that transmitting terminal has T transmitting chain, then the length of each precoding vector is T.When there being a data symbol to send, needing to carry out precoding processing, a number is transformed into T number, then the T number obtained after conversion being sent respectively on T transmitting chain.Usually, a precoding processing process number being become T number is, with a length be T precoding vector w=trans{ [w (1) ..., w (T)] } be multiplied with the data symbol x (0) that will send:
y＝trans{[x(0)w(1)，…，x(0)w(T)]}＝w*x(0)。
Suppose that receiving terminal has R receive chain, channel between transmitting terminal T transmitting chain to a receiving terminal R receive chain is H, wherein H is the matrix of the capable T row of R, i-th is classified as i-th transmitting chain divides other channel fading coefficient to R receive chain, and jth behavior T transmitting chain divides the channel fading coefficient being clipped to a jth receive chain.The data y that transmitting terminal sends is after channel, and the vector of the data composition that a receiving terminal R receive chain receives is:
y’＝trans{[y’(1)，…，y’(R)]}＝H*y＝H*w*x(0)。
Wherein y ' (i) is the data that i-th receive chain (reception antenna) receives.
In the communication system proposed in recent years such as LTE, IEEE802.11n, IEEE802.11ah, when data send, OFDM modulation is all adopted to send.Therefore, for ofdm communication system, the embodiment of the present invention is described at this.
In ofdm communication system, whole system bandwidth partition is become multiple subcarrier (subcarrier).Using the duration of an OFDM symbol as elementary cell on time, the duration of general OFDM symbol becomes reciprocal relation with adjacent two subcarrier spacings.Ofdm system, on the whole, is divided into multiple pieces in time, and frequency is also divided into multiple pieces; Single from the time, one temporal piece comprises multiple subcarrier; Single frequency, the block in a frequency is distributed in multiple OFDM symbol.The data symbol that will transmit in a radio frames, can be mapped on certain subcarrier of certain OFDM symbol respectively when transmitting.The transmitting antenna corresponding due to each subcarrier is generally different to the channel H of reception antenna, so the precoding vector that each subcarrier of possibility adopts is different.But in the time that same radio frames continues, the channel variation in multiple OFDM symbol that same subcarrier is corresponding is usually slow, so multiple OFDM symbol corresponding to same subcarrier adopt identical precoding vector.
In the present embodiment, every a precoding vector can be a precoding vector set, precoding vector each subcarrier of taking of corresponding each data Replica respectively in set.Fig. 4 shows the example utilizing two parts of precoding vectors radio frames to be carried out to precoding in an ofdm system.As seen from Figure 4, there are two transmitting chains, the corresponding transmitting antenna (transmitting antenna 1, transmitting antenna 2) of each transmitting chain, business datum copies twice, has the precoding vector that two parts are different, a copy of it is { [W11, W12], [W21, W22], [W31, W32] }, carry out precoding for the business datum copied first time, another part is { [C11, C12], [C21, C22], [C31, C32] }, carry out precoding for the business datum copied second time.
In the diagram, twice transmission of data symbol with identical order [x1, x2 ..., x6] be mapped on two subcarriers and send.But also possible that, by these data symbols so that different Sequential Mapping to different sub carrier to send.Such as, under launching chain situation first, by [x1, x2, x3, x4, x5, x6] Sequential Mapping on the subcarrier of an OFDM symbol, second launch chain situation under, with the Sequential Mapping of certain cyclic shift on the subcarrier of another OFDM symbol, such as can press [x3, x4, x5, x6, x1, x2] Sequential Mapping on the subcarrier of another OFDM symbol.
Step 330, respectively precoding is carried out to the M part pilot data comprised in radio frames with the M part precoding vector in described N part precoding vector, and send described radio frames by least two transmitting antennas.
Pilot data is pre-set value, and pilot data can be utilized to estimate equivalent channel.Suppose that pilot data is set as P (0), employing precoding vector w=[w (1) ... w (T)] to its precoding processing, after channel H, when not considering Noise and Interference, receiving terminal receives y=H*w*P (0).Because pilot data is pre-set, receiving terminal also knows pilot data in advance, thus receiving terminal can pass through P (0) and y calculates/estimate and obtain equivalent channel H*w, such as H*w=y/x (0).Other and this pilot tone adopt the business datum of identical precoding vector, just can carry out demodulation coding by calculating/estimating the equivalent channel H*w obtained.Such as, in the resource that same duplication service data take, corresponding same subcarrier can adopt identical precoding vector, same pilot data can be adopted to calculate/estimate the equivalent channel obtained and carry out these business datums of demodulation coding.There is M part precoding vector different between two due in N part precoding vector of using in step 320, therefore this M part precoding vector is used to carry out precoding to the M part pilot data comprised in radio frames respectively, corresponding equivalent channel can be obtained at receiving terminal carry out demodulation coding to the data received.
Also can see in the diagram and utilize two parts of different precoding vectors to carry out precoding to two parts of pilot datas.In the example shown in Figure 4, two parts of pilot datas have identical value, and those skilled in the art are it is easily understood that also can use two parts of different pilot datas.
In addition, in the example shown in Figure 4, first occur that pilot data just occurs business datum subsequently in a radio frame in chronological order, but this is not for the restriction of the embodiment of the present invention.Such as, Fig. 5 shows and utilizes two parts of precoding vectors to carry out another example of precoding to radio frames in an ofdm system.Visible, for pilot data and business datum, the relative position relation in radio frames is without any restriction.Those skilled in the art can design according to actual needs.
In addition, learn to carry out which business datum of demodulation by the equivalent channel which pilot data estimates to make receiving terminal, can pre-define the corresponding rule of correspondence, the precoding vector that in copying with N part business datum with the precoding vector that at least which adopts in M part pilot data described in determining, which adopts is identical.Also possible that, this information is included in the control section information of radio frames.
It should be noted that, precoding process also may embody with other forms indirectly, and all embodiments of the present invention also comprise these situations.Such as, in an ofdm system, can use the technology of cyclic-shifted delay (CyclicShiftDelay, CSD), the signal that namely different transmitting chains is launched is cyclic-shifted delay relation each other from the time.Fig. 6 shows the schematic diagram of cyclic-shifted delay technology.The part that the signal that transmitting antenna 2 is launched is equivalent to outside empty for the signal of transmitting antenna 1 frame postpones (moving to right), and before the part in empty frame is moved to.It should be noted that here for Fig. 6 description mentioned by signal all refer to all subcarriers carry an OFDM symbol data investigation synthesis and come time-domain signal.In this CSD launching technique, clearly do not mention and precoding is carried out to the data that each subcarrier carries.But, although CSD technology launches the overall time signal of chain from each, that a transmitting chain signal launches the cyclic-shifted delay of chain relative to another, but according to the character of OFDM technology, if from each subcarrier, the data that the effect that CSD technology reaches is equivalent to same subcarrier carries launch a difference coefficient on chain in difference, the size of this coefficient and the number of cyclic-shifted delay about the length of signal (namely in empty frame), thus are still equivalent to precoding from each subcarrier.So the embodiment of the present invention also comprises and utilizes CSD technology to realize precoding.Further, for CSD, difference copies and adopts different precoding, is equivalent to that different to copy signal relative circular shifts length between each transmitting antenna different.
In addition, in an embodiment of the present invention, the information of the number of copy times N of described business datum and/or the number M of pilot data can be included in the control section of radio frames, and receiving terminal can obtain the number M of number of copy times N and/or pilot data according to the information of the control section of received radio frames thus.Such as, can be carried in control field X-SIG.Also possible that, transmitting terminal and receiving terminal have determined the number M of number of copy times N and/or pilot data in advance, therefore can not comprise corresponding information in radio frames.
Even if due to for identical channel, the performance (such as error probability) adopting different precoding vectors to obtain when receiving terminal demodulating data also may be different, therefore in an embodiment of the present invention, in N part precoding vector, there is M part precoding vector different between two, make it possible to obtain demodulation performance as well as possible at receiving terminal.In addition similarly, due to the business datum that will send in radio frames repeatedly, and sent by multiple transmitting antenna after carrying out precoding, because this reducing the error rate of received data, improve data receiver performance, thus in identical transmitting power situation, increase the distance of transfer of data, also namely enhance the covering power of business.
Fig. 7 shows the flow chart of data transmission method according to another embodiment of the invention.Visible, the method comprises the following steps.
Step 710, the business datum that will send copy N time in radio frames.At this, N be predetermined be more than or equal to 2 natural number.Business datum copies N time in a radio frames, and each data symbol that also namely business datum comprises occurs N time in radio frames.This step is corresponding with the step 310 of method described in conjunction with Figure 3 above, repeats no more here.
Step 720, respectively precoding is carried out to the business datum being replicated N time with N part precoding vector, in N part precoding vector, wherein has M part precoding vector different between two, M be more than or equal to 2 natural number and N >=M >=2.This step is corresponding with the step 320 of method described in conjunction with Figure 3 above, repeats no more here.
Step 730, the information of described precoding vector to be directly included in the control section information of described radio frames, and to send described radio frames by least two transmitting antennas.
As above mentioned, pilot data is pre-set value.In embodiment above, utilize pilot data to estimate equivalent channel H*w.In the present embodiment, do not use precoding vector to carry out precoding to pilot data, but directly the information of precoding vector is included in the control section information of radio frames.Such as, in the set of transmitting terminal and all known precoding vector of receiving terminal, predetermined numbering or index is had for each precoding vector.This numbering or index directly can be included in the control section information of radio frames and (as in the step 330 of preceding embodiment, namely not impliedly be comprised the information of precoding vector by precoding) by transmitting terminal, such as be included in control field X-SIG, thus make receiving terminal after receiving radio frames, from this numbering of control section acquisition of information or index, thus the precoding vector of corresponding use can be determined.In addition also possible that, in transmitting terminal and all known precoding vector set of receiving terminal (delayed modes different under comprising CCD technical situation).And transmitting terminal and receiving terminal use certain precoding vector in described precoding vector set according to predetermined rule.Such as, precoding vector set comprises A part precoding vector { P_1, P_A}, transmitting terminal and receiving terminal can carry out repeating query in order according to predetermined rule and use P_1 to P_A, such as first part of business datum P_1 carrys out precoding, and second part of business datum P_2 carrys out precoding, the like; If the number of times of the business datum copied is greater than the number A of precoding vector in precoding vector set, so such as can specify that A+1 part business datum uses P_1 again, the like.Certainly, it will be understood by those skilled in the art that any predetermined rule of use is all possible.
Suppose that pilot data is set as P (0), after channel H, when not considering Noise and Interference, receiving terminal receives y=H*P (0).Because pilot data is pre-set, receiving terminal is also known in advance, thus receiving terminal can pass through P (0) and y calculates/estimate and obtain H, such as H=y/P (0).Other and this pilot tone adopt the business datum of identical precoding vector (and channel H is identical or close), by calculating/estimating the channel H obtained, combine the precoding vector w obtained from control section information again and obtain H*w, thus demodulation coding can be carried out to the business datum received.Such as, in the resource that same duplication service data take, corresponding same subcarrier can adopt identical precoding vector, and the identical precoding vector that the channel that the calculating/estimation of same pilot data can be adopted to obtain adopts in conjunction with their again carrys out these business datums of demodulation coding.Owing to directly utilizing the pilot data received to estimate channel H in the method for the present embodiment, recycling H and corresponding precoding vector obtain H*w for carrying out demodulation coding to business datum subsequently, therefore can only use a pilot data to estimate channel H.Fig. 8 shows and utilizes two parts of precoding vectors to carry out another example of precoding to radio frames in an ofdm system, visible, only needing a pilot data for estimating channel H in the example of fig. 8, can certainly use more parts of pilot datas.
In an embodiment of the present invention, the information of the number of copy times N of described business datum and/or the number M of pilot data can be included in the control section of radio frames, and receiving terminal can obtain the number M of number of copy times N and/or pilot data according to the information of the control section of received radio frames thus.Also possible that, transmitting terminal and receiving terminal have determined the number M of number of copy times N and/or pilot data in advance, therefore can not comprise corresponding information in radio frames.
In addition, in an embodiment of the present invention, be previously determined precoding vector that in the business datum that N part copies, which adopts identical and be which in M part precoding vectors different between two, or also this information can be included in the control section information of radio frames.
Even if due to for identical channel, the performance (such as error probability) adopting different precoding vectors to obtain when receiving terminal demodulating data also may be different, therefore in an embodiment of the present invention, in N part precoding vector, there is M part precoding vector different between two, make it possible to obtain demodulation performance as well as possible at receiving terminal.In addition similarly, due to the business datum that will send in radio frames repeatedly, and sent by multiple transmitting antenna after carrying out precoding, because this reducing the error rate of received data, improve data receiver performance, thus in identical transmitting power situation, increase the distance of transfer of data, also namely enhance the covering power of business.
Correspondingly, Fig. 9 shows the flow chart of data transmission method according to an embodiment of the invention.Visible, the method comprises the steps.
Step 910, reception radio frames.As described above, control section and business datum part is comprised in radio frames.Receiving terminal can receive radio frames by multiple receive chain.Business datum in these radio frames has been replicated N time when sending, and has been carried out precoding by with N part precoding vector.And also comprise the information of M part pilot data in these radio frames.Pilot data received by receiving terminal be use precoding vector carry out precoding after through the pilot data of transmission, also may be do not carry out precoding and directly through the pilot data of transmission.
The number M of step 920, the number of copy times N obtaining the business datum comprised in described radio frames and pilot data, and the corresponding information of N part precoding vector and the information of M part pilot data.In an embodiment of the present invention, the information of the number M of number of copy times N and/or pilot data is included in the control section information of described radio frames, and receiving terminal can obtain the number M of number of copy times N and pilot data from the control section of described radio frames thus.Also possible that, the number of copy times N of business datum and the number M of pilot data is the value determined in advance between transmitting terminal and receiving terminal.In addition, as described in embodiment above, the information of precoding vector and pilot data combination can be comprised in radio frames, such as comprise, by precoding vector, the information after precoding is carried out to pilot data, make the pilot data after receiving terminal can utilize this precoding and pre-set pilot data to obtain equivalent channel H*w, thus demodulation coding business datum.Also possible that, the information of precoding vector is directly comprised in radio frames, and comprise the information of pilot data, make receiving terminal can utilize receive not by precoding, through the pilot data of transmission and pre-set pilot data to obtain channel H, thus utilize channel H and precoding vector to carry out demodulation coding business datum.About these contents, see embodiment above, no longer can repeat here.
Step 930, the information of described precoding vector and the information of pilot data is utilized to decode to the business datum comprised in described radio frames.As described with earlier embodiments, utilize the information of described precoding vector and the information of pilot data to carry out decoding to the business datum comprised in described radio frames can specifically comprise: received by utilization, carry out precoding respectively with M part precoding vector M part pilot data estimates equivalent channel H*w, and utilizes described equivalent channel to decode to the business datum received; Also possible that, the pilot data (can be a, also can be many parts) received by utilization estimates channel H, and utilizes the described channel H of estimation and described M part precoding vector to decode to the business datum received.About these contents, see embodiment above, no longer can repeat here.
Preferably, described N part precoding vector comprises precoding vectors different between two, particularly comprises M part precoding vectors different between two.
In an embodiment of the present invention, in N part precoding vector, there is M part precoding vector different between two, make it possible to obtain demodulation performance as well as possible at receiving terminal.In addition similarly, due to the business datum that will send in radio frames repeatedly, and sent by multiple transmitting antenna after carrying out precoding, because this reducing the error rate of received data, improve data receiver performance, thus in identical transmitting power situation, increase the distance of transfer of data, also namely enhance the covering power of business.
The embodiment of the present invention also accordingly provides a kind of data sending device.Figure 10 shows the schematic diagram of data sending device according to an embodiment of the invention.Visible, data sending device 1000 comprises: copied cells 1010, copies N time in radio frames for the business datum that will send; Precoding unit 1020, for carrying out precoding to the business datum being replicated N time respectively with N part precoding vector; Transmitter unit 1030, for the information of described precoding vector and the information of pilot data being included in described radio frames, and sends described radio frames by least two transmitting antennas; Wherein N be more than or equal to 2 natural number.
According to a form of implementation, described transmitter unit 1030 also for: be included in described radio frames by the information of described N part precoding vector and the information of M part pilot data, wherein M is natural number, and N >=M >=2.
According to a form of implementation, described transmitter unit 1030 specifically for: respectively precoding is carried out to the M part pilot data comprised in radio frames with the M part precoding vector in described N part precoding vector.
According to a form of implementation, described transmitter unit 1030 specifically for: the information of described precoding vector is directly included in the control section information of described radio frames.
According to a form of implementation, described N part precoding vector comprises M part precoding vectors different between two.
The embodiment of the present invention also accordingly provides a kind of data sink.Figure 11 shows the schematic diagram of data sink according to an embodiment of the invention.Visible, data sink 1100 comprises: receiving element 1110, for receiving radio frames; Information acquisition unit 1120, for the number M of the number of copy times N and pilot data that obtain the business datum comprised in described radio frames, and the corresponding information of N part precoding vector and the information of M part pilot data; Decoding unit 1130, the information for the information and pilot data that utilize described precoding vector is decoded to the business datum comprised in described radio frames; Wherein said N be more than or equal to 2 natural number, M be more than or equal to 1 natural number, and N >=M.
According to a form of implementation, described decoding unit 1130 specifically for: received by utilization, carry out precoding respectively with M part precoding vector M part pilot data estimates equivalent channel, and utilize described equivalent channel to decode to the business datum received, wherein M be more than or equal to 2 natural number.
According to a form of implementation, described decoding unit 1130 specifically for: M part pilot data received by utilization estimates channel, and utilizes the described channel estimated and corresponding M part precoding vector to decode to the business datum received.
According to a form of implementation, described N part precoding vector comprises precoding vectors different between two, particularly comprises M part precoding vectors different between two.
Particular content about said apparatus embodiment see embodiment of the method above, can be set forth here no longer further.
In an embodiment of the present invention, in N part precoding vector, there is M part precoding vector different between two, make it possible to obtain demodulation performance as well as possible at receiving terminal.In addition similarly, due to the business datum that will send in radio frames repeatedly, and sent by multiple transmitting antenna after carrying out precoding, because this reducing the error rate of received data, improve data receiver performance, thus in identical transmitting power situation, increase the distance of transfer of data, also namely enhance the covering power of business.
It should be appreciated by those skilled in the art that in the embodiment of the present invention, the function that is divided into of apparatus module divides, actual concrete structure can be fractionation or the merging of above-mentioned functions module.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The scheme of the content record of claim is also the protection range of the embodiment of the present invention.
One of ordinary skill in the art will appreciate that all or part of process in above-described embodiment method is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. a data transmission method, comprising:
The business datum that will send copies N time in radio frames;
Respectively precoding is carried out to the business datum being replicated N time with N part precoding vector;
The information of described precoding vector and the information of pilot data are included in described radio frames, and send described radio frames by least two transmitting antennas;
Wherein N be more than or equal to 2 natural number;
Wherein said N part precoding vector comprises M part precoding vectors different between two, and wherein M is natural number, and N >=M >=2.
2. method according to claim 1, also comprises: be included in described radio frames by the information of described N part precoding vector and the information of M part pilot data, wherein M is natural number, and N >=M >=2.
3. method according to claim 2, is wherein included in the information of described N part precoding vector and the information of M part pilot data in described radio frames and specifically comprises: carry out precoding to the M part pilot data comprised in radio frames respectively with the M part precoding vector in described N part precoding vector.
4. method according to claim 1, is wherein directly included in the information of described precoding vector in the control section information of described radio frames.
5., according to the method one of claim 2 to 4 Suo Shu, the information of the number of copy times N of wherein said business datum and/or the number M of pilot data is included in the control section information of described radio frames.
6. a data transmission method, comprising:
Receive radio frames;
Obtain the number of copy times N of the business datum comprised in described radio frames and the number M of pilot data, and the corresponding information of N part precoding vector and the information of M part pilot data;
The information of described precoding vector and the information of pilot data is utilized to decode to the business datum comprised in described radio frames;
Wherein said N be more than or equal to 2 natural number, M be more than or equal to 1 natural number, and N >=M;
Wherein said N part precoding vector comprises precoding vectors different between two.
7. method according to claim 6, wherein utilize the information of described precoding vector and the information of pilot data to decode to the business datum comprised in described radio frames specifically to comprise: received by utilization, carry out precoding respectively with M part precoding vector M part pilot data estimates equivalent channel, and utilize described equivalent channel to decode to the business datum received, wherein M be more than or equal to 2 natural number.
8. method according to claim 6, wherein utilize the information of described precoding vector and the information of pilot data to decode to the business datum comprised in described radio frames specifically to comprise: the M part pilot data received by utilization estimates channel, and utilize the described channel of estimation and described N part precoding vector to decode to the business datum received.
9. method according to claim 7, wherein said M part precoding vector is precoding vector different between two.
10. a data sending device, comprising:
Copied cells, copies N time in radio frames for the business datum that will send;
Precoding unit, for carrying out precoding to the business datum being replicated N time respectively with N part precoding vector;
Transmitter unit, for the information of described precoding vector and the information of pilot data being included in described radio frames, and sends described radio frames by least two transmitting antennas;
Wherein N be more than or equal to 2 natural number,
Wherein said N part precoding vector comprises M part precoding vectors different between two, and wherein M is natural number, and N >=M >=2.
11. devices according to claim 10, wherein said transmitter unit also for: be included in described radio frames by the information of described N part precoding vector and the information of M part pilot data, wherein M is natural number, and N >=M >=2.
12. devices according to claim 11, wherein said transmitter unit specifically for: respectively precoding is carried out to the M part pilot data comprised in radio frames with the M part precoding vector in described N part precoding vector.
13. devices according to claim 10, wherein said transmitter unit specifically for: the information of described precoding vector is directly included in the control section information of described radio frames.
14. 1 kinds of data sinks, comprising:
Receiving element, for receiving radio frames;
Information acquisition unit, for the number M of the number of copy times N and pilot data that obtain the business datum comprised in described radio frames, and the corresponding information of N part precoding vector and the information of M part pilot data;
Decoding unit, the information for the information and pilot data that utilize described precoding vector is decoded to the business datum comprised in described radio frames;
Wherein said N be more than or equal to 2 natural number, M be more than or equal to 1 natural number, and N >=M,
Wherein said N part precoding vector comprises precoding vectors different between two.
15. devices according to claim 14, wherein said decoding unit specifically for: received by utilization, carry out precoding respectively with M part precoding vector M part pilot data estimates equivalent channel, and utilize described equivalent channel to decode to the business datum received, wherein M be more than or equal to 2 natural number.
16. devices according to claim 14, wherein said decoding unit specifically for: M part pilot data received by utilization estimates channel, and utilizes the described channel estimated and described N part precoding vector to decode to the business datum received.
17. devices according to claim 15, wherein said M part precoding vector is precoding vector different between two.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110361950.3A CN103107837B (en) | 2011-11-15 | 2011-11-15 | Data transmission method and device |
| PCT/CN2012/084275 WO2013071834A1 (en) | 2011-11-15 | 2012-11-08 | Data transmission method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110361950.3A CN103107837B (en) | 2011-11-15 | 2011-11-15 | Data transmission method and device |
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| CN103107837B true CN103107837B (en) | 2016-03-09 |
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| WO (1) | WO2013071834A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222256A (en) * | 2007-01-09 | 2008-07-16 | 中兴通讯股份有限公司 | Method for transmitting multimedia broadcast multicast service using multi-antenna system |
| CN101765147A (en) * | 2008-12-25 | 2010-06-30 | 大唐移动通信设备有限公司 | Method and device for transmitting data packet under high-speed transmission environment |
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| JP5236807B2 (en) * | 2009-06-12 | 2013-07-17 | 三菱電機株式会社 | Communication device |
| KR20110019287A (en) * | 2009-08-19 | 2011-02-25 | 주식회사 팬택 | Method for trnamitting information and transmitter thereof in wireless communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101222256A (en) * | 2007-01-09 | 2008-07-16 | 中兴通讯股份有限公司 | Method for transmitting multimedia broadcast multicast service using multi-antenna system |
| CN101765147A (en) * | 2008-12-25 | 2010-06-30 | 大唐移动通信设备有限公司 | Method and device for transmitting data packet under high-speed transmission environment |
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| WO2013071834A1 (en) | 2013-05-23 |
| CN103107837A (en) | 2013-05-15 |
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