CN100370720C - Method and apparatus for transmitting data in communication system - Google Patents
Method and apparatus for transmitting data in communication system Download PDFInfo
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- CN100370720C CN100370720C CNB031549837A CN03154983A CN100370720C CN 100370720 C CN100370720 C CN 100370720C CN B031549837 A CNB031549837 A CN B031549837A CN 03154983 A CN03154983 A CN 03154983A CN 100370720 C CN100370720 C CN 100370720C
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Abstract
The transmission method has data symbols transmitted between at least one transmission station (BS) with a number of spaced antenna elements (A1,A2,..An) and at least one reception station (MS1,..MSk), e.g. a mobile radio device or mobile data terminal, via a radio interface (V), with coding of the data symbols before transmission. At least 2 data symbols to be transmitted at a given time point are directed to one of the spaced antenna elements in dependence on the coding and simultaneously transmitted via this antenna element.
Description
Technical field
The present invention relates to a kind of device that in communication system, transmits the method for data and be used to carry out this method.
Background technology
Known such as abide by GSM (global system for mobile communications) or UMTS (universal mobile telecommunications system) standard wireless communication system, wherein a plurality of subscriber boards communicate by the emission receiving platform of wave point and network side.Also known in addition data communication network of for example abideing by the HiperLAN standard, wherein the radio station of data station of Yi Donging and network side gets in touch.
For adopted many channels in emission side transfer of data is given the transfer of data of many different receiving platforms, owing to there is serious problem in multipath transmisstion.For example, the signal that sends from antenna arrives recipient's antenna on the one hand by a direct path, on the other hand also after reflected by objects the side in this directapath after reflection, arrive reception antenna with a time delay.If need transmission symbol (especially being understood as that single bit or packet) time delay greater than described can be by the spuious delay of determining of root mean square, that then selected transmission channel is regarded as non-frequency choosing or flat fading.Under latter event, described channel is equivalent to a subcarrier simultaneously, and does not have a plurality of subcarriers and be used for transmission symbol.On the contrary, under the symbol time delay situation spuious less than average retardation, described channel will be regarded as choosing decline frequently.This will produce intersymbol interference (ISI), and this interference will have influence on the functional of transmission frame mistake aspect when not adopting compensation method.
Plan should be adopted mobile communication system under the situation of third generation user data rate, this data rate in cellular environment greater than 20Mbps.Under the situation of the spectrum efficiency of making an appointment with " 1Bit/s Hz/ sub-district ", required total bandwidth is up to 20MHz.Therefore the bit time delay is about 50ns.Typical average retardation broadening in macrocellular (root mean square delay broadening) is to the maximum under the situation of 10 μ s, and a transmission symbol will disturb ensuing 200 symbols, and this can bring bigger signal processing expense.Therefore some have been developed for satisfying the cut-in method that above-mentioned requirements designs better.A kind of possible selection scheme is so-called OFDM (Orthodoxy Frequency Division Multiplex), and wherein the data that need send were multiplexed into before being launched on the different transmission frequencies of a respective sub in the frequency band, and described each subcarrier is mutually orthogonal.The shortcoming of OFDM is: high spike/average-power ratio; Need carrier synchronization; Owing to the time of needing protection between each data block brings waste of capacity; And need carry out channel estimating to each subcarrier or to the subcarrier of certain quantity.
Also disclose the fading channel of choosing frequently from the WCDMA (Wideband Code Division Multiple Access (WCDMA)) of UMTS standard, in this standard, the data that send have been carried out the division and the coding in broadband.But the multipath transmisstion in this system has disturbed the orthogonality of extended code.Rake receiver can be used to constructively make up the multipath composition.
When adopting a plurality of transmitting antenna, receive a superposed signal the recipient, this signal has passed through the propagation path of corresponding most amounts.This can cause disadvantageous interference the recipient.
Summary of the invention
Task of the present invention is to develop a kind of method and a kind of device of carrying out this method, and it can realize the replacement scheme of transfer of data.
This task solves by the following device that is used in the method for communication system transmission data and is used to carry out this method.Also be, according to of the present invention in communication system through wave point from the method for at least one transmitting station at least one receiving platform transmission symbol, described transmitting station has four antennas that spatially separate, wherein in described at least one transmitting station, three symbols and auxiliary symbol are combined into the equal row vector of one 4 * 4 matrix, wherein select described auxiliary symbol to make the mould-2-of symbol of described row vector add and equal 0; Described matrix multiply by mutually with one 4 * 4 hadamard matrix and obtains a matrix of consequence, the diagonal element of wherein said matrix of consequence is assigned to described four antennas respectively, and the single diagonal element with nonzero value distributed to an antenna uniquely, and only launches by this antenna.
The present invention correspondingly also relates to a kind of radio station of communication system, have through the emitter of communication system wave point by four sky at least one receiving platform transmission symbols of alignment that spatially separate in this radio station, wherein said emitter has a control device and a memory that is used to store 4 * 4 hadamard matrixs, and wherein this emitter has the device that is used for carrying out described method.
Therefore preferably a kind of in communication system through the method for wave point at least one transmitting station and at least one receiving platform transmission symbol, described transmitting station has a plurality of antennas that spatially separate, described symbol is the form of data especially, wherein the symbol that need send utilized code to encode before emission, a plurality of, at least two symbols that need be sent out on a time point are assigned at least one in the described antenna that spatially separates respectively according to described coding, and launch by this antenna simultaneously on this time point.This symbol that single antenna assignment is sent out to needs according to code (especially single data, bit or encoded radio) has just produced a kind of space encoding.At this, antenna element that spatially separates in the antenna that antenna also can be understood that to constitute compoundly or the like.Scheme as an alternative also can be given a plurality of in many antennas the allocation of symbols that arrives, and this is at least than adopting all antennas will reduce interference.
Useful is, said coding many sign map to especially being that feasible always have only an antenna on a resource (such as frequency) to launch, thereby avoided interference on the single coded identification to be sent.Alternatively, but also can carry out following coding, wherein be mapped on the available antenna of limited quantity.
When distributing described antenna so that sending coded identification, preferably adopt a hadamard matrix, this matrix always satisfies mould-2-and adds and equal 0 this condition.Therefore, when distributing described antenna so that sending coded identification, the value of the symbol that transmits simultaneously according to need and distribute a Walsh-hadamard-sign indicating number clearly preferably.
When distributing described antenna so that sending coded identification, can adopt one to have the matrix of a plurality of symbols and the product of described hadamard matrix simply, wherein the row of matrix adds the symbol that equals 0 this condition and forms by satisfying mould-2-.When determining antenna, distribute an antenna respectively for the diagonal element of the matrix of consequence that draws by matrix multiplication, wherein utilize the mould-2-condition of sign matrix and hadamard matrix, after matrix multiplication, have only a diagonal element to be not equal to 0.The result is, has only an independent antenna to launch in many antennas, produces space encoding thus.
In described preferred embodiment, the mould-2-of each row of the condition is-symbol matrix of setting adds and equals 0, but also can set other value, wherein needs code or code matrices are made corresponding changes.
Preferably, so that when sending coded identification, adopt one to have the matrix of a plurality of symbols and the product of a code matrices at the antenna that distributes described antenna or limited quantity.The matrix notation that draws by matrix product a symbol with regard to described matrix shine upon one to one.Thereby provide a distinct symbols that sends from needs to the mapping each antenna of antenna groups with complete universal mode.Can advantageously realize different combinations at this.So the symbol of a plurality of arrival can be mapped on the single symbol that needs transmission, this single symbol is launched by single antenna then.Scheme as an alternative, described symbol also can be launched by a plurality of selected antennas.But also form mapping one to one between the symbol that can transmit, then by these symbols of different antenna transmission at symbol and two or more need of one or more arrival.What finally have decisive significance is, learns code or the code matrices that is adopted the recipient or by receiving platform, and learns the transmitting antenna that is adopted in addition, makes the original symbol of reconstruct correspondingly from received single or multiple symbols.
In receiving platform, can be by about the coding that when sending, adopted, especially simply the coded identification that receives be carried out inverse transformation about the knowledge of hadamard matrix.In order in receiving platform, can when symbol is carried out inverse transformation, to use the antenna knowledge that when launching, is adopted, especially always provide a kind of autonomous determining by the recipient who measures received signal, for example adopt common estimating and measuring method.But even if scheme disadvantageous, also can utilize broadcast channel etc. to allow the transmitting antenna that is adopted directly transmit as an alternative.
Not only can give a plurality of different receiving platforms a series of symbol transmission of coding that need, and can give single receiving platform a data flow transmission of forming by a plurality of symbols.Especially also can make up them, also promptly transmit a plurality of symbols, a plurality of same radio station that are transferred to are respectively wherein arranged, other then be transferred to one or more other radio station.
Owing to always only receive, so by determining that antenna sends data value, data block or symbol be favourable by one in a plurality of different propagation paths the recipient.Therefore avoided otherwise may because by different antennas simultaneously to especially being that single receiver sends the interference that signal brings.So, select on the subcarrier in order to replace the known different frequency that expands in the frequency band, perhaps except this expansion, carried out a kind of space encoding herein.
Useful is, determines antenna so that to send data all be each data symbol or each than specially carrying out, like this, when transmission individual voice element is lost the speech data that is not too critical, the very high-quality received signal of can regenerating.
Useful is, for the device of carrying out this method, especially the transmitting and receiving apparatus of network side and subscriber board, it also has a memory except control with enough specifications and treatment facility, wherein post the algorithm that has stored up suitable hadamard matrix and be used to carry out this method.
Description of drawings
Tell about embodiment by accompanying drawing below.Among the figure:
Fig. 1 show a communication system the layout that transmits and receives device and the emission root according to shown in formula be assigned to the data division of transmitting antenna, what wherein need to transmit is the data of different receiving platforms, and
Fig. 2 shows a kind of like this layout, and what wherein need to transmit is the different pieces of information of single receiving platform.
Embodiment
As shown in Figure 1, communication system is made of a plurality of dissimilar equipment.They are many antenna A1 in network side, A2, and A3 ..An, these antenna are assigned to the emission and/or the receiving equipment BS of network side as antenna groups.This emission and/or receiving equipment preferably have the memory M that is used to required data of the work of depositing and algorithm, and also have a control appliance C who is used to carry out the required course of work.The method of being told about below control appliance C and memory M can preferably be used to carry out.Usually, described emission and/or receiving equipment BS are by on the network side equipment that is connected to other directly or indirectly, for example be connected to base station control device, Operation and Maintenance Center or lead on the interface of other communication network,, be simplicity of illustration these equipment that do not draw at this.
In addition, described communication system also has many mobile or static subscriber board MS1, MS2 ... MS (k-1), for example vehicular radio or mobile data terminal.These subscriber boards MS1, MS2 ... MS (k-1) has memory M and control appliance C equally, and they are used to move these radio station and carry out method described below.
Thus, shown device comprises n antenna A1, A2 ..., An and k-1 subscriber board MS1 ... MS (k-1), these antenna is regarded as the radiated element of following method, and these subscriber boards are regarded as receiving element, reception radio station or the receiving system of following method.This method also can be used on the contrary, wherein preferably sets up between each subscriber board and coordinates and corresponding data and information exchange.
In the method for being told about, adopted the space dimensionality of novel transmission plan below.At this, need the data or the information of transmission to utilize hadamard matrix by multiplexed.This is multiplexed will to produce different signals.These signals are imported into antenna groups A1 ..., An.This just causes the coding of data aspect the space.Scheme additionally or as an alternative in addition, this coding can be expanded at frequency domain or time domain.By multiplexed and what be transmitted is the symbol that can be understood that data and message form, especially individual data bit, data-bit-group and/or its part that is encoded.
The symbol time delay may be subjected to antenna A1 ..., the influence of the quantity of An.Usually, this mode is similar in known OFDM method and utilizes different subcarriers to carry out temporal expansion.At this, broadband system so far is used to digital broadcast transmitting or supports wireless local data net.In this system, at first adopt OFDM and conversion thereof.Also do not have so far to use and have the cellular broadband system of high data rate.This type systematic be so-called the 4th generation communication system target.Method described below also can be applied to old system, but especially is used to this fourth-generation system.
The left-hand component of Fig. 1 shows the data that are imported within transmitting and receiving apparatus BS or the base station, and these data will be through antenna A1 ..., An and interface V are transferred to receiving platform MS1 ..., MS (k-1).As can be seen, data for example should be transferred to k-1 the subscriber board MS1 as receiving platform ..., MS (k-1).At this, shown symbol should for example be made up of a data bit respectively.Also transmit an auxiliary symbol in addition, transmit k symbol so altogether.Also auxiliaryly this code division is become i subcycle c in the drawings
1 MS1, c
2 MS1..., c
i MS1, wherein show and be used to the radio station MS1 shown in a plurality of respectively ..., subcycle and the auxiliary symbol of MS (k-1).At this, each subcycle has time delay t
Sub, the overall delay t of this time delay equal symbol
BitQuantity divided by symbol.Therefore, total symbol time delay t
BitThe quantity that depends on the subcycle that is adopted for data bit etc. is encoded.The quantity of subcycle equals antenna A1 ..., the quantity of An, wherein k=n.
Scheme as an alternative also can resemble and continuous symbol or data is provided for single subscriber board MS1 Fig. 2, rather than give a plurality of different subscriber board MS1 ..., MS (k-1) transmission symbol.Obviously also can adopt the mixed form of these two kinds of data presentation modes.
Therefore k-1 symbol or data have been shown so that be transferred to k-1 subscriber board MS1 in Fig. 1 and 2 ..., MS (k-1), or 3 symbol transmission to single this subscriber board MS1.Symbol time delay t
BitBe divided into i subcycle.Each subscriber board MS1 ..., first, second of MS (k-1) ... i subcycle constituted a symbol that length is k-1.
Shown in the formula of the zone line of Fig. 1, each subcycle c
1, c
2..., c
iBe arranged to the form of matrix S.For this reason, comprise auxiliary symbol, form a row vector s by the symbol that k needs are transmitted.This row vector is increased k doubly to form a k * k matrix S then.K symbol that so produces and arrange or row vector s respectively with a Walsh-hadamard-sign indicating number WHC (A1) ..., WHC (An) multiplies each other, wherein n=k.This just obtains multiplying each other of matrix S and code or hadamard matrix H on mathematics, described hadamard matrix is by each Walsh-hadamard-sign indicating number WHC (A1) ..., WHC (An) forms.This multiplication will draw a matrix of consequence T.
Adopt the advantage of hadamard matrix H to be, equal 0 by " mould-2-adds " of supposing all symbols, have only an element to be not equal to 0 on the leading diagonal of matrix of consequence T.
Above-mentioned from the matrix T that matrix multiplication obtains, each diagonal element T
1,1, T
2,2... T
I, kBe assigned to the antenna A1 of emission and/or receiving equipment BS respectively, A2 ... or An, wherein n=k.Carry out precoding and adopt hadamard matrix H will obtain following advantage by the symbol that a plurality of need are transmitted: always have only a diagonal element T
1,1, T
2,2... T
I, kBe not equal to value " 0 ".Correspondingly, always have only an independent antenna A1 ... An is transfused to one and transmits, and makes both spatially also to have separated the described k that an is launched symbol or k-1 useful data symbol in time.Therefore, at a symbol period t
BitIn have only an independent antenna A1 ... An launches.Symbol time delay t
BitWith the situation that is used for a subscriber board is identical, but k symbol of transmission, wherein originally needs the symbol of transmission or needs the data value of transmission originally and individual other the encoding symbols of k-1.This will cause the raising of spectrum efficiency.
The recipient, also promptly at subscriber board MS1 ... MS (k-1) there needs following information: at k different antenna A1 ... which has had launched data symbol that is received or the data that received among the An (n=k).This knowledge can obtain by transmit a corresponding information concurrently through broadcast channel, perhaps preferably by the processing on the space, for example obtain by so-called beam-shaping or the distinctive characteristic wave shaping of antenna.If transmitting antenna A1 ... Ak and received signal are correctly measured, then can recover received one or more symbol by the j row that received signal be multiply by hadamard matrix H, and wherein j is corresponding to transmitting antenna A1 ... the antenna number of Ak.
Correspondingly, at the subscriber board MS1 that receives ... must also exist in the hadamard matrix H that emission side adopts among the MS (k-1).This hadamard matrix H is deposited with each subscriber board MS1 temporarily or enduringly ... among the memory M of MS (k-1).The advantage of temporarily depositing is, hadamard matrix H can be transferred to subscriber board MS1 at every turn when being registered to the new sub-district of new communication system or this communication system ... MS (k-1), therefore can upgrade at any time.
For " mould-2-adds " of all symbols of being met a row or a row vector s equals the matrix S of 0 this condition, for example can define an auxiliary channel, this auxiliary channel is taken by auxiliary signal current.This for example can realize by bit filling or parity check code.If for example resemble Fig. 2 that works and adopt 4 antenna A1 ..., A4 then can multichannel three symbols that are made of useful data.The 4th character position is used as auxiliary channel, guarantees that by it " mould-2-adds " equals 0.Illustrate the functional of this auxiliary channel by following form with data sequence:
| Symbol n | Symbol n+1 | Symbol n+2 | |
| |
0 | 1 | 1 |
| Channel 2 | 1 | 1 | 1 |
| Channel 3 | 1 | 0 | 1 |
| |
0 | 0 | 1 |
At this, according to the numeral of its top with whether satisfy described " mould-2-adds " condition and in the field of auxiliary channel, always optionally be provided with one 0 or 1.Producing overload by this auxiliary channel, is the overload of 1/4=25% in this case.This overload will be along with the antenna A1 that is adopted ..., the quantity of An increases and descends, and irrelevant with the characteristic of channel.This overload for example has only 10% under the situation of 10 antennas.By contrast, in ofdm system, because the cause of guard time, this overload will depend on the characteristic of channel and be positioned at 15%～30%.
Setting up this form with as four antenna A1 ... under the situation on the basis of A4, have 2 in theory
4=16 kinds of combinatory possibilities, this possibility is reduced to 2 because having adopted auxiliary channel
3This auxiliary channel is used to seek 1 of odd number, has an odd number value if comprise the described row of the field of himself, then changes this bit in its corresponding field.Satisfy thus " mould-2-condition ".According to this characteristic of the combination that also remains 4 kinds of linear independences, these combinations will lucky combination corresponding to hadamard matrix H.This specific character will be used in the scheme of being told about herein.
The multipath transmisstion of signal can not influence the orthogonality of Walsh-hadamard-sign indicating number, because the multipath subscriber signal made up before transmission, also promptly multiplies each other with Walsh-hadamard-sign indicating number, and symbol time delay t
BitRemain unchanged.By contrast, in cdma system, multiple user signals on the air interface, that its chip time delay is far smaller than the symbol time delay adds up mutually.
For scheme shown in Figure 2, a system with symbol s of four antenna A1...A4 and four need transmission is investigated on following example ground, wherein the symbol s of this four need transmission for example is transferred to three different subscriber boards continuously, perhaps resembles to be transferred to single this radio station MS1 shown in the drawings.
At time delay t
BitIn should transmit four symbols, wherein after " mould-2-adds " carry out precoding by enforcement, can represent the order s={-1 11-1} of this sequence according to following explanation and Fig. 2.Begin useful symbol or the useful data bit of three positions corresponding to the needs transmission.The 4th position is corresponding to overhead bit or auxiliary symbol, and this overhead bit or auxiliary symbol are so arranged, and makes " mould-2-adds " of vector equal 0.The sequence s that is made up of four this symbols or order is increased four times and form sign matrix S with the form of row:
The hadamard matrix H of antenna A1....A4 is made up of four Walsh-hadamard-sign indicating numbers as column vector:
At the symbol of needs transmission and when producing Walsh-hadamard-sign indicating number, adopted digital " 0 " and " 1 " as value, but adopted a kind of coding again in order to transmit through wave point V, wherein in order to substitute indefinite state value " 0 ", transmit a value that is defined as bearing " 1 ", and when setting up matrix, adopt this value.By being multiplied each other, matrix S and matrix H draw matrix T:
As can be seen, have only single element to be not equal to 0 in matrix of consequence T on the diagonal, be last diagonal element T herein
4,4In this case, this diagonal element T
4,4Be assigned to the 4th antenna A4 among the antenna groups A1...A4.Correspondingly send a negative value-4 by antenna A4, perhaps after standardization, send a negative value-1.
In the decode procedure of receiving platform MS1, utilized the 4th antenna A4 to launch this knowledge.Walsh-hadamard-sign indicating number the WHC (A4) that is assigned to the 4th antenna A4 is the 4th column vector h={1-1-1 1}.Therefore, the final result of recipient's signal reconstruction is-4 (or-1) .{1-1-1 1}={-4 4 4-4}, and { 11 1-1} draw by antenna number after standardization for this.The order that this transmits corresponding to need just.Thus, carried out this knowledge of emission by the knowledge of the hadamard matrix that is adopted and by which antenna element among the antenna groups A1...A4 or antenna A4, can contravariant change to this result the recipient.Thus, although only carried out symbol transmission one time, three symbols with useful data will appear in receiving platform MS1.Therefore the 4th original auxiliary symbol that is transshipped corresponding to conduct by the symbol of reconstruct be not taken as an evidence.
By carrying out the combination of space encoding by the multi-antenna technology of supporting wireless communication, the multichannel multiplexing method of this employing hadamard matrix H has been realized the transmission through the high data rate of wave point V.This advantage is similar to the advantage that is obtained by known OFDM method, but has advantageously avoided the above-mentioned shortcoming of this OFDM method.
This scheme especially can advantageously be applied to the transmission of down direction DL, specifically, at first can be used for the situation when adopting different pieces of information speed dissimilar professional.Simultaneously, in the evolution of present technology, wish to support in the future wireless data service on up link and down link, to have different traffic carrying capacitys, because utilize few packet will ask the information that is had the mass data scope usually.To this, down direction is regarded as the limited weakness of message capacity usually.For example can mention so-called web browsing, because causes such as file downloads, present down direction capacity is higher than the up direction capacity far away.
But, purely in principle,, also can be applied to up direction when when subscriber board MS1...MS (k-1) carries out corresponding programming.Especially at the subscriber board that is connected with each other or communicates by letter or can undertaken under the situation of transmitting users platform by a plurality of channels, adopting such scheme also is possible in principle.Correspondingly, can usually be referred to as to be used for the method for following situation, promptly adopt a plurality of transmitters or antenna to transmit different symbols or data in this case.Advantageously provide a plurality of receiving equipments, especially user's travelling carriage too the recipient.
Above-mentioned transmits just in order to illustrate and distinguish data symbol and auxiliary symbol better to maximum k-1 receiving platform.Obviously, by adopting common method signal is transferred to different a plurality of radio station, the method that also can utilize here to be told about is transmitted to the receiving platform more than k-1.
Also can adopt the antenna assembly that has more than n=k antenna or antenna element.So just can realize utilizing a corresponding antenna amount of symbol to carry out space encoding with transmission simultaneously.But antenna amount is many more, and emission side and recipient's calculating cost is just high more.On the other hand, along with increasing of the antenna amount that is adopted, can improve the pay(useful) load ratio, these antenna has finally been represented spacing element.
Purely in principle, also can adopt the antenna assembly that has two or more antennas to launch simultaneously, thereby a code is assigned to each antenna patterns rather than antenna number.Though increased the diversity of operational code thus, and increased the symbol that transmits with emission process simultaneously, still, only otherwise adopt different frequencies, just have the interference damage that should be lowered, and these disturb script to be overcome by said method with needs.In addition, receiving platform must be distributed to reception antenna and transmitting antenna to two or more signals simultaneously and clearly.
Claims (2)
- In communication system through wave point, (V) from least one transmitting station, (BS) at least one receiving platform, (MS1, ... MS4, ... the MSk) method of transmission symbol, described transmitting station has four antennas that spatially separate, (A1, A2, ... A4), wherein at described at least one transmitting station, (BS) in, three symbols and an auxiliary symbol are combined into one 4 * 4 matrix, (S) equal row vector, (s), wherein select described auxiliary symbol to make described row vector, mould-the 2-of symbol (s) adds and equals 0Described matrix (S) multiply by mutually with one 4 * 4 hadamard matrix (H) and obtains a matrix of consequence (T), whereinThe diagonal element of described matrix of consequence (T) be assigned to respectively described four antennas (A1, A2 ... A4), and the single diagonal element with nonzero value distributed to an antenna (A4) uniquely, and only launches by this antenna (A4).
- 2. the radio station of communication system (BS), have through four the antenna (A1s that spatially separate of communication system wave point (V) by this radio station (BS), A2, ... A4) at least one receiving platform (MS1, ... MS4, ... MS (k-1)) emitter of transmission symbol, wherein said emitter has a control device (C) and a memory (M) that is used to store 4 * 4 hadamard matrixs (H), and wherein this emitter has the device that is used for carrying out the method for claim 1.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP02018971.8 | 2002-08-26 | ||
| DE2002139063 DE10239063A1 (en) | 2002-08-26 | 2002-08-26 | Data symbol transmission method for communications system with simultaneous transmission of at least 2 data symbols via antenna element selected in dependence on data symbol coding |
| DE10239063.0 | 2002-08-26 | ||
| EP02018971A EP1394980B1 (en) | 2002-08-26 | 2002-08-26 | Data transmission with multiple transmit antennas |
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| CN1489303A CN1489303A (en) | 2004-04-14 |
| CN100370720C true CN100370720C (en) | 2008-02-20 |
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| CN101631327B (en) * | 2009-08-04 | 2012-08-08 | 华为技术有限公司 | Method for sending and receiving microwave business data, device thereof and transceiver system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002035762A1 (en) * | 2000-10-27 | 2002-05-02 | Nortel Networks Limited | Combination of space-time coding and spatial multiplexing, and the use of orthogonal transformation in space-time coding |
| CN1354610A (en) * | 2000-11-16 | 2002-06-19 | 朗迅科技公司 | Feedback techinque of wireless system with several transmitting and receiving antennas |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002035762A1 (en) * | 2000-10-27 | 2002-05-02 | Nortel Networks Limited | Combination of space-time coding and spatial multiplexing, and the use of orthogonal transformation in space-time coding |
| CN1354610A (en) * | 2000-11-16 | 2002-06-19 | 朗迅科技公司 | Feedback techinque of wireless system with several transmitting and receiving antennas |
Non-Patent Citations (2)
| Title |
|---|
| Joint transmit and receive optimization for high datarate wireless communication using multiple antennas. Hemanth Sampath , Arogyaswani J.Paulraj.IEEE,Signals Systems and Computers, 1999,Vol.1 . 1999 * |
| Space-time block codes from orthogonal designs. Vahid Tarokh , Hamid Jafarkhani , A.R.Calderbank.IEEE Transactions on Information Theory,Vol.45 No.5. 1999 * |
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