CN101902780B

CN101902780B - Method for wireless multi-user communication and device thereof

Info

Publication number: CN101902780B
Application number: CN 200910052080
Authority: CN
Inventors: 刘瑾; 赵岩; 温萍萍
Original assignee: Alcatel Lucent Shanghai Bell Co Ltd
Current assignee: Nokia Shanghai Bell Co Ltd
Priority date: 2009-05-26
Filing date: 2009-05-26
Publication date: 2013-03-13
Anticipated expiration: 2029-05-26
Also published as: CN101902780A

Abstract

The invention provides a wireless multi-user multi-input multi-output communication method and a device thereof in order to solve the problem of low pairing freedom degree caused by the unbalance principle of user pairing in the conventional multi-user multi-input multi-output technology. Second user equipment sends second information according to the noise at a base station, and first user equipment sends first information according to the interference of signals of the second information at the base station; and the base station receives mixed signals of the signals of the first information and the signals of the second information, acquires the first information from the mixed signals, and acquires the second information from the mixed signals based on the first information. Preferably, the second user equipment and the first user equipment select coding and modulation modes by using SNR and SINR respectively to ensure that the base station can accurately detect respective information under the conditions of interference and noise so that the user pairing is not limited by the unbalance principle, the degree of freedom is increased and the complexity of the base station is reduced.

Description

The method of wireless multi-user communication and device thereof

Technical field

The present invention relates to radio communication, relate in particular to the multi-user's mimo communication in the radio communication.

Background technology

Development along with radio communication, demand to power system capacity is more and more higher, alone family multiple-input, multiple-output (Single-user MIMO, being called for short SU-MIMO) communication can't satisfy the capacity requirement of communicating by letter simultaneously between numerous subscriber equipmenies of base station and its jurisdiction gradually, thereby, multi-user's multiple-input, multiple-output (Multi-user MIMO is called for short MU-MIMO) communication technology is arisen at the historic moment and has been obtained certain development.Multi-user's mimo communication generally is that a receiving terminal receives the mixed signal from a plurality of information signals of a plurality of transmitting terminals simultaneously: each transmitting terminal uses its one or more antenna single or many sky alignment receiving terminals to send its signal, and receiving terminal detects respectively the information that each subscriber equipment sends separately from mixed signal.For example, in the MU-MIMO wireless network, the base station uses its many antennas and a plurality of user to communicate simultaneously.

Among the MU-MIMO, because each user's space region calibration is not enough, may cause interfering with each other between each user, this multi-user interference (Multi-user Interference, be called for short MUI) may cause the systematic function severe exacerbation, be a major issue that this area need to solve.In the downlink communication of MU-MIMO, beam forming, zero forcing algorithm (Zero-forcing can be passed through in the base station, abbreviation ZF), block diagonalization (Block Diagonalization, be called for short BD) transmit precoding technique or nonlinear optimization dirty paper code method (Dirty Paper Coding such as (Multi-user Eigen-mode Transmission) with the multi-user features mould, be called for short DPC) etc. means, concentrate design and transmit a plurality of users' signal, to reduce the multi-user interference in the downlink communication.And in uplink communication, can't concentrate in phase mutually the transmitted signal of optimizing different user to reduce multi-user interference between a plurality of users.

Except multi-user interference, for uplink communication, suitable user's scheduling strategy also is a very large challenge to using same channel (when being identical/frequency Resource Block) user to carry out suitable selection.From the angle of multiple user information theory, under the principle of maximized system capacity, scheduling strategy should be made balance between maximization multi-user diversity gain and these two factors of the less multi-user interference of each user generation.In other words, scheduling strategy should carry out co-design with the receiver algorithm with the interference eliminated.In theory, select complete orthogonal users can avoid occurring multi-user interference, but fact proved, in the MU-MIMO system, this condition of the complete quadrature of user extremely is difficult to satisfy on the same time/frequency source block, special size when the time-frequency Resource Block is larger, and this condition of the complete quadrature of user is more difficult to be satisfied.Therefore, more or less all can produce multi-user interference between the multi-user of shared same time/frequency source block, this interference is to use existing mixed signal isolation technics, for example the detection method such as least mean-square error (Minimum Mean Square Error, be called for short MMSE) is eliminated fully.

Based on 3GPP Long Term Evolution (Long Time Evolution, abbreviation LTE) single-carrier frequency division multiple access (Single-Carrier Frequency-Division Multiple Access, abbreviation SC-FDMA) in the system, for up MU-MIMO communication, in order to effectively utilize the receiver attribute of continuous Interference Cancellation, Nortel has proposed a kind of so nonequilibrium user's scheduling strategy: routine as shown in Figure 1, base station selected one is positioned in the middle of the residential quarter, stronger user 1 and one are positioned at cell edge, more weak user 2 shares identical channel and carries out MU-MIMO communication as the pairing user.Two users determine that in the signal to noise ratio (be the signal plus noise power ratio, be called for short SNR) at place, base station it sends the employed coding of its information and modulation system according to its signal.Because user 2 is weak users, its signal that sends is very little to the interference of user 1 signal, and after user 1 and user's 2 mixed signal being carried out the MMSE detection, the SINR of the signal on detected user 1 this road equals its SNR approx; Although user's 1 employed coding and modulation system are to determine according to its SNR, as long as user 2 interference is enough little, the base station can correctly detect the information data that user 1 sends from the signal on user 1 this road of disturbing with trace.Then, again based on correct detected user's 1 information, use the detection technique of continuous Interference Cancellation (SIC), from mixed signal, detect user 2 information.

In this technology, match criterion (namely from each user of jurisdiction, selecting suitable user 1 and user 2) for the user, the base station has added the uneven condition that two users are necessary for a strong user and a weak user, this restrictive condition has dwindled the flexibility ratio of user's pairing, is unfavorable for that system is according to the system optimization such as principles such as maximum capacity.In addition, because weak user 2 generally need to choose from Cell Edge User, therefore may cause 2 pairs of adjacent cells of user to produce presence of intercell interference.

In addition, in the practical communication process, two users' that match based on this user's scheduling strategy degree of unbalance may be not enough, so that user 2 signal may cause to user 1 signal larger interference.In this case, because user 1 coding and modulation system are not considered the interference that user 2 signal causes, so the base station not necessarily can at first correctly detect user 1 information.Thereby, the signal that can't predict which user can at first correctly detect, so actual base station receiver has two groups of detections, the demodulation code device that corresponds respectively to

user

1 and 2, with the corresponding signal to

user

1 and 2 simultaneously detect, the demodulation code to be obtaining the information of

user

1 and 2, and respectively the decoding correctness of two information is verified.This base station also has one group of Interference Cancellation and detection, demodulation code device, to detect another information based on the correct information of checking from mixed signal.As seen, owing to the two groups of detections, the demodulation code device that have corresponding to two users, the complexity of base station system is higher.

Summary of the invention

In order to overcome the above problems, a kind of rational MU-MIMO communication means is proposed, increasing the degree of freedom of user's pairing, thereby multi user wireless communication network is carried out such as optimizations such as maximum capacity is very necessary.In addition, design the low multiple user base stations receiver of a kind of corresponding complexity, to reduce the base station system cost, also have good development prospect.

Embodiment according to an aspect of the present invention, a kind of method of carrying out multi-user's multiple-input, multiple-output in wireless network is provided, comprising the steps: that I. the second subscriber equipment obtains sends the used secondary signal processing mode of the second information to the base station, the selection of described secondary signal processing mode considers that signal is at the noise at place, base station after the processing of the second information; II. first user equipment obtains and sends the used first signal processing mode of the first information to the base station, and the signal interference that signal produces after place, described base station is to the processing of the described first information after the processing of the second information is considered in the selection of described first signal processing mode; III. first user equipment and the second subscriber equipment are respectively according to the signal processing mode that obtains, the described first information and the second information are carried out corresponding signal process, and after the processing of the described first information that will obtain after the processing of signal and the second information signal send to described base station; IV. described base station receives the mixed signal of signal after the processing of signal and the second information after the processing of the described first information; V. the coherent signal of the described first information is isolated in described base station from described mixed signal, and obtains the described first information according to separating accordingly processing mode with described first signal processing mode; VI. described base station is based on the described first information that obtains, and removes signal after the processing of the described first information of described base station reception from described mixed signal, and obtains described the second information according to separating accordingly processing mode with described secondary signal processing mode.

Embodiment according to a further aspect of the present invention, a kind of method that is used for carrying out with a plurality of subscriber equipmenies multi-user's mimo communication in the base station is provided, wherein, comprise the steps: that i. receives the mixed signal of signal after the processing of signal and the second information after the processing of the first information, wherein, the selection that described the second subscriber equipment sends the used secondary signal processing mode of described the second information signal is considered after the processing of the second information signal at the noise at place, base station, and the signal interference that signal produces after place, described base station is to the processing of the first information after the processing of described the second information is considered in the selection that first user equipment sends the used first signal processing mode of the described first information; Ii. from described mixed signal, isolate the coherent signal of the described first information, the coherent signal of the described first information comprises the interference of signal after the processing of described the second information, and obtains the described first information according to separating accordingly processing mode with described first signal processing mode; Iii. based on the described first information that obtains, from described mixed signal, isolate the coherent signal of described the second information, the coherent signal of described the second information comprises the noise at place, base station, and obtains described the second information according to separating accordingly processing mode with described secondary signal processing mode.

Embodiment according to third aspect of the present invention, a kind of device that is used for carrying out with a plurality of subscriber equipmenies multi-user's mimo communication in the base station is provided, wherein, comprise: receiver, mixed signal for signal after the processing of signal and the second information after the processing that receives the first information, wherein, the selection that described the second subscriber equipment sends the used secondary signal processing mode of described the second information signal is considered after the processing of the second information signal at the noise at place, base station, and the signal interference that signal produces after place, described base station is to the processing of the first information after the processing of described the second information is considered in the selection that first user equipment sends the used first signal processing mode of the described first information; First deriving means, be used for isolating from described mixed signal the coherent signal of the described first information, and obtaining the described first information according to separating accordingly processing mode with described first signal processing mode, the coherent signal of the described first information comprises the interference of signal after the processing of described the second information; Second deriving means, be used for based on the described first information that obtains, from described mixed signal, isolate the coherent signal of described the second information, the coherent signal of described the second information is included in the noise at place, base station, and obtains described the second information according to separating accordingly processing mode with described secondary signal processing mode from described mixed signal.

Preferably, above-mentioned signal processing mode comprises coding and/or modulation system, the selection of this first signal processing mode considers that the signal of signal at the place, base station adds after the processing of the first information and disturbs and noise ratio, and the selection of this secondary signal processing mode considers that signal is at the signal plus noise ratio at place, base station after the processing of the second information.

Multi-user's multiple-in and multiple-out communication method according to an embodiment of the invention, after the base station is selected to carry out the pairing user of multi-user's mimo communication according to Optimality Criteria (such as the maximized system capacity criterion), determine in advance the demodulating and decoding order, the interference that the signal that first user equipment is considered the second subscriber equipment produces its signal and obtain coding and/or modulation system, and its information carried out the processing such as corresponding coded modulation and send, the second subscriber equipment considers that noise obtains coding and/or modulation system, and its information is carried out the processing such as corresponding coded modulation and send; The base station at first goes out the information of this first user equipment with given Probability Detection from mixed signal, then, according to the information of detected this first user equipment, the signal with this information from mixed signal separates, and detects successively the information of the second subscriber equipment at last again in the base station.Because the base station is carried out not being subject to when the user dispatches non-equilibrium user and is matched condition, can greatly increase the pairing degree of freedom, and can carry out better the optimization such as wireless communication systems such as maximized system capacity.And, in real system, because user's detection order determined in advance, so a group demodulation and decoding device can only be installed in the base station, to each user successively demodulating and decoding, thereby obviously reduced the complexity of base station receiver.

Description of drawings

By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, above and other feature, purpose and advantage of the present invention will become more apparent:

Fig. 1 is the schematic diagram of two subscriber signals in processing procedure of the multi-user of carrying out mimo communication of the prior art;

Fig. 2 is a specific embodiment according to the present invention, and radio multi-user multiple-input, multiple-output network carries out the flow chart of the method for multi-user's mimo communication;

Fig. 3 is a specific embodiment according to the present invention, carries out the block diagram of the transmitter of multi-user communication in the subscriber equipment;

Fig. 4 is a specific embodiment according to the present invention, carries out the block diagram of the receiver of multi-user's mimo communication in the base station;

Fig. 5 is that the block diagram of the device of multi-user's mimo communication is carried out in the base station according to another specific embodiment of the present invention.

In the accompanying drawing, identical or the similar identical or similar parts of accompanying drawing sign representative.

Embodiment

Below with reference to Fig. 2 to Fig. 4, the embodiment to one aspect of the invention describes in detail from the angle of method.

Present embodiment is to use its subscriber equipment (being called for short UE 1 and UE 2) separately to carry out the uplink multi-users mimo communication as example with the base station under it based on two users 1 in the MU-MIMO cordless communication network of SC-FMDA and user 2, present invention is described.Wherein, as shown in Figure 3, two subscriber equipmenies have respectively a transmit antennas, and it carries out the communication information separately respectively after the signal such as coded/modulated processes, with signal S after the processing that obtains ₁With S ₂In identical wireless channel, send; As shown in Figure 4, the base station comprises two reception antennas, and the signal that sends to receive UE 1 and UE 2 because UE 1 and UE 2 channel transmitted signal altogether, is the mixed signal of the signal of the signal of UE 1 and UE 2 so the base station receives.Be appreciated that the present invention is not limited to the SC-FDMA wireless network.

At first, in step S10, UE 1 and UE 2 are determined in the base station from the subscriber equipment of its jurisdiction.For example, the scheduler of base station is determined UE 1 according to service priority, then generally determines UE 2 according to the maximum system capacity principle.Especially, the user equipment (UE) 1 that scheduler is chosen pairing need not satisfy non-equilibrium condition with UE 2, and is more for base station selected subscriber equipment, and the larger pairing scheduling degree of freedom and power system capacity can be provided.

Then, in step S11, in one case, the signal that the base station is estimated channel and calculated UE1 adds and disturbs and noise ratio SINR, and the signal plus noise of UE 2 is than SNR, and it is offered respectively UE 1 and UE 2.

In another case, after the base station uses said method to determine the SINR of UE 1, determine the signal processing mode that UE 1 is used, so that UE 1 can successfully be detected with given probability by the base station under this SINR condition with the signal that this signal processing mode sends, for example modulate and/or coded system (or being called for short MCS), and will indicate respectively the indication information of these two MCS, for example MCS-index offers respectively UE 1 and UE 2.Present embodiment is appreciated that take modulation and/or coded system as example describes signal processing mode signal processing mode can also comprise spatial reuse, precoding, sends diversity etc., does not do at this and gives unnecessary details.

Then, in one case, in step S20, UE 1 receives from the base station, and the SINR that UE 1 is up to the base station, and determine to match according to SINR can successfully be decoded with given probability by the base station and the MCS of demodulation; In step S20 ', UE 2 receives from the base station, and the SNR that UE 2 is up with the base station, and determine to match according to SNR can successfully be decoded with given probability by the base station and the MCS of demodulation.For example, if SINR or SNR are higher, subscriber equipment just can be selected the higher MCS of information rate, and vice versa.

In another case, the mode of its coding and modulation has been determined respectively in the base station for UE 1 and UE 2, and in step S20 and S20 ', UE 1 and UE 2 receive respectively the indication information from the MCS of base station so.

Be appreciated that owing to such as not being the reasons such as reference signal that subscriber equipment is arranged in each frame time, so the base station carries out user's pairing, and determine that the frequency of its SINR and SNR or MCS is indefinite.In some cases, user's pairing is carried out in the base station, determine and sent its SINR and SNR or MCS, after two subscriber equipmenies of pairing have received respectively SINR and SNR or MCS, subscriber equipment can preserve it, all use this SINR and SNR or MCS to carry out MU-MIMO within ensuing a period of time and communicate by letter, in this case, system does not carry out above step S10, S11 and S20 and S20 '.

Then, in step S21, UE 1 comprises business datum, signaling etc. to its first information that sends to the base station, uses transmitter as shown in Figure 3, according to encoding, modulate with the corresponding MCS of SINR.Subsequently, subscriber equipment to modulation signal carry out serial/parallel conversion, DFT (discrete Fourier transform (DFT)), with subcarrier mapping, IFFT (invert fast fourier transformation) and the CP (Cyclic Prefix) of pilot tone insert wait processing after, processed accordingly rear signal S ₁, and send by antenna.Especially, for UE 1, it sends the employed coding of the first information and/or modulation system, is SINR under the disturbed condition that produces according to the signal that the signal that UE 2 sends sends UE 1 at the place, base station and definite.

Similarly, in step S21 ', UE 1 according to after encoding, modulate with the corresponding MCS of SNR, after DFT, subcarrier mapping, IFFT and CP insert, is processed rear signal S to its second information that sends to the base station more accordingly ₂, and send by antenna.

Present embodiment is appreciated that in based on other technology transmitter and base station receiver so that present invention is described as example based on the transmitter of SC-FDMA and corresponding base station receiver, the present invention is applicable equally, for example, in some ofdm system, it is omissible that above DFT processes.

Because UE 1 and UE 2 are two users that match among the MU-MIMO, the channel that sends its signal is identical, two users' signal S ₁And S ₂In the space, mix, formed mixed signal.

Then, in step S12, two antennas of base station receive respectively one tunnel mixed signal.For convenience of description, the mixed signal that receives on the antenna 1 is shown h ₁₁S ₁+ h ₂₁S ₂+ n ₁, wherein, h ₁₁Be the channel matrix of UE 1 to antenna 1, h ₂₁Be the channel matrix of UE 2 to antenna 1, n ₁Be the additive white Gaussian noise that receives on the antenna 1; The mixed signal that receives on the antenna 2 is shown h ₁₂S ₁+ h ₂₂S ₂+ n ₂, wherein, h ₁₂Be the channel matrix of UE 1 to antenna 2, h ₂₂Be the channel matrix of UE 2 to antenna 2, n ₂Be the additive white Gaussian noise that receives on the antenna 2.The base station uses buffer (Buffer) that the two-way mixed signal is cached respectively.

Then, in step S13, the base station at first obtains the signal that UE 1 sends based on least mean-square error (MMSE) detection method.

Concrete, as shown in Figure 4, the MMSE detector arrives two antenna receptions, UE1 is coupled with the mixed signal solution of UE 2, has obtained two paths of signals: the one tunnel corresponding to UE 1, comprise useful signal S ₁, the interference that produces of UE 2 and noise be at interior signal; Another road corresponding to UE 2, comprise useful signal S ₂, the interference that produces of UE 1 and noise be at interior signal.The method that concrete MMSE detects is that one of ordinary skill in the art is known, does not do at this and gives unnecessary details; In addition, the present invention is not limited to the uncoupled method of this a kind of mixed signal of MMSE, and other method is also applicable.

Then, IDFT module and the MCS of base station ^-1That module (be soft demodulation, deinterleave and decoder module) is separated MMSE, detect corresponding to the signal of UE 1.Although be appreciated that and contain the interference that UE 2 produces in this signal, the MCS that adopts when sending this signal owing to UE 1 is based on the SINR value that this interference is taken into account, so the signal S that the base station can successfully be detected with given probability ₁Thereby, obtain the first information that UE 1 sends.In addition, the base station uses buffer to be cached corresponding to the signal of UE 2 one tunnel

Preferably, in step S14, the first information that the base station sends detected UE 1 for example adopts CRC (cyclic redundancy check (CRC)) method to verify, judge whether it detects correctly, with the error propagation that prevents to occur, use this information to disturb to eliminate and cause when detecting the second information.If verification is correct, follow-up step S15 is carried out in the base station; If check errors, then the base station then to through the buffer buffer memory, that MMSE separates, detect corresponding to the road signal of UE 2, attempt obtaining the second information that UE 2 sends, and its correctness of verification.If verification is correct, the base station successfully gets access to the second information that UE 2 sends so.

In step S15, the base station obtains the information that UE 2 sends according to the first information from mixed signal.

In one embodiment, the base station is used to disturb and is eliminated, and the signal of the first information of removal UE 1 then detects the information of UE 2 to the interference of the information of UE 2.

Concrete, to the information that this UE that correctly detects 1 sends, the base station disturb eliminate and checkout gear in it is carried out the processing such as the identical coding of the processing carried out with UE 1 this information of transmission, modulation, DFT, the signal S that reconstruct UE 1 sends ₁Then, this signal is carried out channel reduction, reduction obtains received S on two antennas of base station respectively ₁Component h ₁₁S ₁And h ₁₂S ₁Be appreciated that the base station carries out uplink channel estimation according to the reference signal of UE 1, and obtain the channel reduction process in used uplink channel information.。

Then, base station signal S that reduction is obtained ₁Component h ₁₁S ₁And h ₁₂S ₁From two antenna receptions to, remove the mixed signal by the buffer buffer memory.Obtained removing signal S ₁The mixed signal h of component ₂₁S ₂+ n ₁And h ₂₂S ₂+ n ₂

At last, disturb MMSE detector, IDFT module and the MCS of elimination and checkout gear ^-1Module to removed interference, only comprise noise and signal S ₂The reception signal detect.Because UE 2 codings, the MCS that uses when modulating its waiting message are based on signal to noise ratio snr, so this signal S can successfully be detected with given probability in the base station ₂Thereby, obtain the second information that UE 2 sends.

Like this, the first information and the second information that send separately of UE 1 and UE 2 is all successfully detected.

In general, the MCS that user 1 carries out according to SINR should guarantee that it is at mixed automatic retransfer request (Hybrid Automatic Repeat reQuest, the Block Error Rate of the base station demodulating and decoding abbreviation HARQ) (BLock Error Rate is called for short BLER) is 10%.Therefore, user 1 detects unsuccessfully, and there is the probability of 10% extraneous solution code delay like this in base station then detect signal through the user 2 of buffer memory.But, in other situations of 90%, embodiments of the invention are correctly decoded user 1 signal, and then disturb and eliminate and Check processing, have avoided user 2 signal being carried out IDFT processing and demodulation, deinterleaving and decoding before eliminating and detecting disturbing.Because the present invention just determines the detection order of its signal when determining two users of pairing, and can guarantee by this correct probability that detects in sequence (90%), then as shown in Figure 4, base station receiver can utilize this information of knowing in advance, and one group of IDFT and MCS only are installed ^-1Module was only carried out IDFT to user 1 before disturbing elimination and detection and demodulating and decoding is processed, and had saved 80% IDFT useless, leading Receiver Complexity and demodulation, deinterleaving and decoding and had processed, and greatly reduced system complexity.

The present invention has carried out emulation relatively to multi-user's multiple-input, multiple-output of the multi-user's multiple-in and multiple-out communication method among the above embodiment and existing Nortel proposition based on following simulation parameter.

Table 1

Parameter	Value
		Channel model	City macrocell subscriber equipment 1 antenna, base station 2 antennas
Carrier frequency	2.0GHz
		Sample rate	15.36MHz
System bandwidth	10MHz (FFT size=1024)
		Allocation of subcarriers	84 (DFT size=84)
Average orthogonality between the user	D _k ³0.7
		Modulation system	QPSK，16QAM
Chnnel coding	The 1/3turbo coding
		Code block size	1280bits
The subcarrier mapping	Centralized
		The subscriber equipment translational speed	30km/hr
Channel estimating	Desirable
		The Turbo decoder	Log-MAP, 8 iteration

In emulation, two pairing users' orthogonality is not less than 0.7, and this is higher.In emulation, for prior art, suppose strong user's 1 the front SINR of processing ₁Be 8dB, SINR before weak user's 2 the processing ₂Be 5dB.For present embodiment, suppose user 1 the front SINR of processing ₁Be 8dB, SNR before user 2 the processing ₂Be 5dB.For guaranteeing that the BLER of user 1 in the situation of considering HARQ (hybrid autonomous retransmission) is not higher than 10 ^-1, user 1 MCS is according to SINR ₁Select 1/3Turbo coding and 16QAM modulation.And user 2 is according to SNR ₂Use the modulation system of 1/3Turbo coding and QPSK.Because the user's 2 of MMSE output SINR ₂Be lower than its SNR ₂, before disturbing elimination and testing process, user 2 Block Error Rate is far longer than 10%.

Table 2

In the form, " probability of success of disturb eliminating and detecting " expression is removed signal after the interference by disturbing the probability of eliminating and detecting the correct detection of institute.

As seen, for prior art, the probability of eliminating and detecting for disturbing of two users adds up to about 80%.Before disturbing elimination and detecting, two users' signal all will be processed through IDFT and demodulating and decoding, and wherein one road signal demand is processed through IDFT and demodulating and decoding after disturbing elimination again, so that the IDFT that this road signal carries out at this moment and demodulating and decoding are processed without any effectiveness.This useless processing has increased the complexity of receiver to a great extent, but the performance gain that brings is very few.

Prior art is compared, can find out that the present invention is disturbing BLER and prior art after eliminating and detecting similar.But according to the analysis of Fig. 4 and front as can be known, IDFT is only carried out to user 1 before eliminating and detecting and demodulating and decoding is processed disturbing in the base station of the embodiment of the invention, has saved 80% useless IDFT and demodulating and decoding and has processed, and greatly reduces system complexity.

In order further to assess the complexity of two kinds of technology, table 3 shows the utilance of several main modular.

Table 3

Module	Prior art	The present invention	The complexity that reduces
				DFT	p1	p2	(p1-p2)/p1
IDFT
		2+p1	2	p1/(2+p1)
MCS					p1	p2	(p1-p2)/p1
	MCS
^-1		2+p1	2	p1/(2+p1)

Wherein, for prior art, its probability that carries out that DFT and MCS carry out signal reconstruction is to disturb the Probability p 1 (81.56%) of eliminating and detecting inferior; Carry out IDFT and MCS ^-1Probability before disturb eliminating and detecting, respectively two users are carried out 2 times, and disturb the p1 (81.56%) that carries out in eliminating and detecting inferior, add up to 2+p1 time.For the present invention, carrying out the probability that DFT and MCS carry out signal reconstruction is to disturb the Probability p 2 (87.91%) of eliminating and detecting inferior; Carry out IDFT and MCS ^-1Probability be 1 time of before disturb eliminating and detecting user 1 being carried out, disturb p2 time in eliminating and detecting after user's 1 checking is correct, and 1-p2 time of after user's 1 authentication error user 2 being detected, add up to 2 times.Can find out, improve although the present invention carries out the probability of DFT and MCS processing, carry out IDFT and MCS ^-1It is about 29% that the probability of processing has reduced, and IDFT and MCS ^-1Be the principal element that determines Receiver Complexity, so the present invention has reduced the complexity of base station receiver significantly.

In above embodiment, contain two reception antennas take the base station and one embodiment of the present of invention are described as example.One of ordinary skill in the art is appreciated that the present invention is equally applicable to the scene that a reception antenna is contained in the base station.In this case, the mixed signal of the signal of the information of two subscriber equipmenies of single antenna reception of base station, wherein, the information that at first detects is provided the interference that the signal of this information that at first detects produces at the place, base station by the signal of its subscriber equipment according to another information.Then, the base station at first can go out the information that this at first detects by demodulating and decoding from mixed signal.Then, based on this information, the interference that from mixed signal the signal of this information is produced is removed, and detects another information at last from removed the mixed signal of disturbing.

Above embodiment take two subscriber equipmenies as the pairing terminal of MU-MIMO as example, invention has been described.Be appreciated that the present invention is not limited to two pairing terminals, in the situation that wireless channel and Demodulation Systems decoding capability allow, can support the multi-user communication of three and above subscriber equipment and base station, below will be described this situation.

3 user equipment (UE)s 1, UE 2 and UE 3 carry out MU-MIMO with the base station, and wherein the detection of UE 1 order is the highest, UE 2 secondly, UE 3 is minimum.The SINR of signal under the disturbed condition, UE 1 is determined at the signal of UE 2 and UE 3 signal of UE 1 to be produced in the base station ₂₃, and determine and this SINR ₂₃ Corresponding UE 1 coding and modulation system; And the SINR of the signal of the UE 2 under the disturbed condition is determined at the signal of UE 3 signal of UE 2 to be produced in the base station ₃, and determine and this SINR ₃Corresponding UE 2 corresponding coding and modulation systems; In addition, the SNR of the signal of UE 3 is also determined in the base station, and definite UE 3 corresponding coding and modulation systems.Above-described and SINR or SNR's is corresponding, refers to that the signal of the information processed with determined coding and modulation system can successfully detect with given probability under this SINR or SNR condition.

User equipment (UE) 1, UE 2 and UE 3 be respectively according to its MCS, its first information to be sent, the second information and the 3rd information encoded and modulated, and respectively the signal that obtains is sent.The first information, the second information and the 3rd information signal separately mix in the space, and mixed signal is received by the base station.

Then, the base station uses the MMSE method to isolate signal corresponding to UE 1 one tunnel from the mixed signal of UE 1, UE 2 and UE 3, comprises interference and noise that the signal of information of useful signal, UE 2 and the UE 3 of the first information of UE 1 causes in this signal.Since UE 1 to the coding of its information and modulation system based on SINR ₂₃, thereby guarantee in the situation of interference that UE 2 and UE 3 cause and noise, can successfully detect, then the base station can detect the first information of UE 1.

Then, the base station is according to the first information of the UE 1 that detects, the signal of the first information of the UE 1 that reduction receives, and it is removed from mixed signal.Then, the base station uses the MMSE method to isolate the signal of UE 2 one tunnel from the first information of having removed UE 1 in the mixed signal of the signal of base station.Comprise interference and noise that the signal of information of useful signal, the UE 3 of the second information of UE 2 causes in this signal.Since UE 2 to the coding of its information and modulation system based on SINR ₃, thereby guarantee in the situation of interference that UE 3 causes and noise, can successfully detect, then the base station can detect the second information of UE 2.

At last, the base station is according to the second information of the UE 2 that detects, the signal of the second information of the UE 2 that reduction receives, and it is removed in the mixed signal of the signal of base station from the first information of having removed UE 1.Then, the base station uses the MMSE method to isolate the signal of UE 3 one tunnel from the information of having removed UE 1 and UE 2 in the mixed signal of the signal of base station.The useful signal and the noise that comprise UE 3 in this signal.Because UE 3, thereby guarantees can successfully detect in the situation of noise based on SNR to the coding of its information and modulation system, then the base station can detect the 3rd information of UE 3.

Like this, three subscriber equipment information separately that participate in MU-MIMO all are detected.According to the instruction in the embodiment of the invention, the multi-user communication method when one of ordinary skill in the art can obtain subscriber equipment more than three and participates in MU-MIMO, this specification is not done at this and is given unnecessary details.

More than from the angle of method embodiments of the invention are described, the below is with reference to Fig. 5, from the angle of device embodiments of the invention is described.

As shown in Figure 5, the device 1 that is used for carrying out multi-user's mimo communication with user equipment (UE) 1 and UE 2 of base station comprises contrast means 10, processing unit 11, receiver 12, the first deriving means 13 and the second deriving means 12.User equipment (UE) 1 be used for and device 2 that multi-user's mimo communication is carried out in the base station comprises and determines device 20 and transmitter 21.User equipment (UE) 2 be used for and device 2 ' that multi-user's mimo communication is carried out in the base station comprises and determines device 20 ' and transmitter 21 '.

At first, the contrast means 10 of base station is determined UE 1 and UE 2 from the subscriber equipment of its jurisdiction.For example, contrast means 10 is scheduler, and it determines UE 1 according to service priority, then generally determines UE 2 according to the maximum system capacity principle.Especially, the user equipment (UE) 1 that contrast means 10 is chosen pairing need not satisfy non-equilibrium condition with UE 2, and is more for base station selected subscriber equipment, and the larger pairing scheduling degree of freedom and power system capacity can be provided.

Then, in one case, processing unit 11 determines that the signal of UE 1 adds interference and noise ratio SINR, reaches the signal plus noise of UE 2 than SNR, and it is offered respectively UE1 and UE 2.Concrete, processing unit 11 can measure the SNR of the signal of UE 2; And the reference signal that sends according to UE 2, in conjunction with the channel information of this channel, the signal that can calculate UE 2 causes in the situation of interference the SINR of the signal of UE 1.

In another case, processing unit 11 is determined the SINR of UE 1, and behind the SNR of UE 2, determine with the SINR coupling, UE 1 sends the used signal processing mode of its first information, such as modulation and/or coded system (or being called for short MCS), and with the SNR coupling, UE 2 sends the used signal processing mode of its second information, such as modulation and/or coded system, and will indicate respectively the indication information of these two MCS, for example MCS-index offers respectively UE 1 and UE 2.

Then, in one case, definite device 20 of UE 1 and definite device 20 ' of UE 2 receive respectively from the base station, the SNR between the SINR between base station and the UE 1 and base station and the UE 2.Determine what device 20 and definite device 20 ' were determined to match according to SINR and SNR respectively, can successfully be decoded with certain probability by the base station and the MCS of demodulation.For example, if SINR or SNR are higher, subscriber equipment just can be selected the higher MCS of transmission rate, and vice versa.

In another case, the mode of its coding and modulation has been determined respectively in the base station for UE 1 and UE 2, and definite device 20 ' of definite device 20 of UE 1 and UE 2 receives respectively the indication information from the MCS of base station so.

Be appreciated that owing to such as not being the reasons such as reference signal that subscriber equipment is arranged in each frame time, so the base station carries out user's pairing, and determine that the frequency of its SINR and SNR or MCS is indefinite.In some cases, contrast means 10 is carried out user's pairing, determine and sent its SINR and SNR or MCS, after user equipment (UE) 1 and UE 2 have received respectively SINR and SNR or MCS, UE 1 and UE 2 can preserve it, definite device 20 ' of the device 2 ' of definite device 20 of the device 2 of UE 1 and UE 2 reads this SINR and SNR or MCS and carries out MU-MIMO and communicate by letter within ensuing a period of time, in this case, the contrast means 10 of the device 1 of base station and processing unit 11 are omissible.

Then, the transmitter 21 ' of the transmitter 21 of the device 2 of UE 1 and the device 2 ' of UE 2 comprises business datum, signaling etc. respectively to its information that sends to the base station, encodes, modulates according to corresponding MCS.Subsequently, transmitter to modulation signal carry out serial/parallel conversion, DFT (discrete Fourier transform (DFT)), with subcarrier mapping, IFFT (invert fast fourier transformation) and the CP (Cyclic Prefix) of pilot tone insert wait processing after, processed accordingly rear signal S ₁And S ₂, and use respectively its antenna to send.The structure of transmitter as shown in Figure 3, present embodiment is so that present invention is described as example based on the transmitter of SC-FDMA and corresponding base station receiver, be appreciated that, in based on other technology transmitter and base station receiver, the present invention is applicable equally, for example, in some ofdm system, it is omissible that above DFT processes.

Especially, for UE 1, it sends the employed coding of the first information and/or modulation system, is SINR under the disturbed condition that produces according to the signal that the signal that UE 2 sends sends UE 1 at the place, base station and definite.

Then, the receiver 12 of the device 1 of base station receives mixed signal.Concrete, as shown in Figure 4, two antennas of receiver 12 receive respectively one tunnel mixed signal.For convenience of description, the mixed signal that receives on the antenna 1 is shown h ₁₁S ₁+ h ₂₁S ₂+ n ₁, wherein, h ₁₁Be the channel matrix of UE 1 to antenna 1, h ₂₁Be the channel matrix of UE 2 to antenna 1, n ₁Be the additive white Gaussian noise that receives on the antenna 1; The mixed signal that receives on the antenna 2 is shown h ₁₂S ₁+ h ₂₂S ₂+ n ₂, wherein, h ₁₂Be the channel matrix of UE 1 to antenna 2, h ₂₂Be the channel matrix of UE 2 to antenna 2, n ₂Be the additive white Gaussian noise that receives on the antenna 2.The base station is temporary with two paths of signals.

Then, the first deriving means 13 at first obtains the signal that UE 1 sends based on least mean-square error (MMSE) detection method.The first deriving means 13 comprises the first resolver and the first checkout gear.

Concrete, as shown in Figure 4, the first resolver is a MMSE detector, and mixed signal solution coupling that two antenna receptions are arrived, UE 1 and UE 2 has obtained two paths of signals: the one tunnel corresponding to UE 1, comprise useful signal S ₁, the interference that produces of UE 2 and noise be at interior signal; Another road corresponding to UE 2, comprise useful signal S ₂, the interference that produces of UE 1 and noise be at interior signal.The method that concrete MMSE detects is that one of ordinary skill in the art is known; In addition, the first resolver is not limited to this a kind of mixed signal resolver of MMSE detector, and other detector is applicable too.The first deriving means 13 comprises a buffer, it will corresponding to UE 2, comprise useful signal S ₂, UE 1 interference and the noise that produce be temporary at interior signal.

Then, that the first checkout gear is separated the MMSE detector, detect corresponding to the signal of UE 1, as shown in Figure 4, this first checkout gear can comprise IDFT module and MCS ^-1Module (be soft demodulation, deinterleave and decoder module).Although be appreciated that and contain the interference that UE 2 produces in this signal, the MCS that adopts when sending this signal owing to UE 1 is based on the SINR value that this interference is taken into account, so the signal S that the base station can successfully be detected with given probability ₁Thereby, obtain the first information that UE 1 sends.

Preferably, the first deriving means 14 also comprises calibration equipment, and it comprises as shown in Figure 4 CRC check device and decision device.The information that this calibration equipment sends detected UE 1 for example adopts CRC (cyclic redundancy check (CRC)) method to verify, and judge whether it detects correctly, with the error propagation that prevents from occurring, use this information to disturb to eliminate and cause when detecting the second information.If verification is correct, then the second deriving means 15 is started working; If check errors, then the first checkout gear of the first deriving means 14 then to through the buffer buffer memory, detect corresponding to the road signal of UE 2, attempt obtaining the second information that UE 2 sends, its correctness of calibration equipment verification.

If verification is correct, the second deriving means 15 obtains the information that UE 2 sends according to the first information from mixed signal.

In one embodiment, the second deriving means 15 uses to disturb to be eliminated, and removes the signal of the first information to the interference of UE 2.The second deriving means 15 comprises reduction apparatus, separator, the second resolver and second detection device.

Concrete, the first information to this UE that correctly detects 1 transmission, the reduction apparatus of the second deriving means 15 comprises such as modules such as the MCS among Fig. 4, DFT, the first information is carried out sending with UE 1 processing such as the processing that this information carries out is encoded accordingly, modulation, DFT, the signal S that reconstruct UE 1 sends ₁Then, reduction apparatus also comprises such as the reduction channel module among Fig. 4, based on the uplink channel information of UE 1 to the base station, this signal carried out the channel reduction, and reduction obtains received S on two antennas of base station respectively ₁Component h ₁₁S ₁And h ₁₂S ₁Uplink channel estimation is carried out according to the reference signal of UE 1 in the base station, and obtains used uplink channel information in the channel reduction processing.

Then, the signal S that such as the separator of the subtracter among Fig. 4 reduction is obtained ₁Component h ₁₁S ₁And h ₁₂S ₁From the two-way mixed signal by the buffer buffer memory, remove respectively.Obtained removing signal S ₁The mixed signal h of component ₂₁S ₂+ n ₁And h ₂₂S ₂+ n ₂

The second resolver comprises such as the MMSE detector among Fig. 4, it parse removed interference, only comprise noise and signal S ₂Signal.Second detection device comprises such as DFT module and MCS among Fig. 4 ^-1Module.Because UE 2 codings, the MCS that uses when modulating its waiting message are based on signal to noise ratio snr, so second detection device can successfully detect this signal S with given probability ₂Thereby, obtain the second information that UE 2 sends.

Like this, the information that sends separately of UE 1 and UE 2 is all successfully detected.

3 user equipment (UE)s 1, UE 2 and UE 3 carry out MU-MIMO with the base station, and wherein the detection of UE 1 order is the highest, UE 2 secondly, UE 3 is minimum.Processing unit 11 determines at the signal of UE 2 and UE 3 signal of UE 1 to be produced the SINR of the signal of the UE 1 under the disturbed condition, and definite UE 1 corresponding coding and modulation system, so that can under the interference of UE 2 and UE 3, detect in the information of processing under this coding and the modulation system; And, processing unit 11 determines at the signal of UE 3 signal of UE 2 to be produced the SINR of the signal of the UE 2 under the disturbed condition, and definite UE 2 corresponding coding and modulation systems, so that can under the interference of UE 3, detect in the information of processing under this coding and the modulation system; In addition, processing unit 11 is also determined the SNR of the signal of UE 3, and definite UE 3 corresponding coding and modulation systems.Processing unit 11 sends to respectively three user equipment (UE)s 1, UE 2 and UE 3 with three subscriber equipmenies MCS indication information separately.

User equipment (UE) 1, UE 2 and UE 3 be based on separately MCS, respectively its first information to be sent, the second information and the 3rd information encoded and modulate, and respectively it is sent.The first information, the second information and the 3rd information signal separately mix in the space.

User equipment (UE) 1, UE 2 and UE 3 transmitter separately be according to its MCS, its first information to be sent, the second information and the 3rd information encoded and/or modulated, and respectively it is sent.The first information, the second information and the 3rd information signal separately mix in the space.

Then, the MMSE detector of the first resolver of the first deriving means 13 of base station is isolated the signal corresponding to UE 1 one tunnel from the mixed signal of UE 1, UE 2 and UE 3, comprise interference and noise that useful signal, UE 2 and the UE 3 of UE 1 cause in this signal.Because UE 1 considered interference and the noise that UE 2 and UE 3 cause to coding and the modulation system of its information, i.e. SINR, then the first checkout gear can be successfully detects the first information of UE 1.

Then, the reduction apparatus of the second deriving means is according to the first information of the UE 1 that detects, and the first information of the UE 1 that reduction receives is at the signal at place, base station, and separator is removed it from mixed signal.Then, the MMSE detector of the second resolver of the second deriving means is isolated the signal of UE 2 one tunnel in the mixed signal of the signal of base station from the first information of having removed UE 1.Comprise the useful signal of UE 2, interference and the noise that UE 3 causes in this signal.Because UE 2 considered interference and the noise that UE 3 causes to coding and the modulation system of its information, i.e. SINR, then second detection device can be successfully detects the second information of UE 2.

At last, reduction apparatus is according to the second information of the UE 2 that detects, and the second information of the UE 2 that reduction receives is at the signal at place, base station, and separator is removed from the first information of having removed UE 1 it in the mixed signal of the signal of base station.Then, the MMSE detector of the second resolver is isolated the signal of UE 3 one tunnel in the mixed signal of the signal of base station from the information of having removed UE 1 and UE 2.The useful signal and the noise that comprise UE 3 in this signal.Because UE 3 considered noise to coding and the modulation system of its information, i.e. SNR, then second detection device can be successfully detects the 3rd information of UE 3.

Like this, three subscriber equipment information separately that participate in MU-MIMO all are detected.According to the instruction in the embodiment of the invention, the device of the multi-user communication when one of ordinary skill in the art can obtain subscriber equipment more than three and participates in MU-MIMO, this specification is not done at this and is given unnecessary details.

Although in accompanying drawing and aforesaid description, illustrate in detail and described the present invention, should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The invention is not restricted to above-mentioned execution mode.

The those skilled in the art of those the art can be by research specification, disclosed content and accompanying drawing and appending claims, and understanding and enforcement are to other changes of the execution mode of disclosure.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.In the practical application of invention, the function of a plurality of technical characterictics of quoting during a part possibility enforcement of rights requires.Any Reference numeral in the claim should not be construed as the restriction to scope.

Claims

1. a method of carrying out multi-user's multiple-input, multiple-output in wireless network comprises the steps:

I. the second subscriber equipment obtains and sends the used secondary signal processing mode of the second information to the base station, and the selection of described secondary signal processing mode considers that signal is at the noise at place, base station after the processing of the second information;

II. first user equipment obtains and sends the used first signal processing mode of the first information to the base station, and the signal interference that signal produces after place, described base station is to the processing of the described first information after the processing of the second information is considered in the selection of described first signal processing mode;

III. first user equipment and the second subscriber equipment are respectively according to determined signal processing mode, the described first information and the second information are carried out corresponding signal process, and after the processing of the described first information that will obtain after the processing of signal and the second information signal send to described base station;

IV. described base station receives the mixed signal of signal after the processing of signal and the second information after the processing of the described first information;

V. the coherent signal of the described first information is isolated in described base station from described mixed signal, and obtains the described first information according to separating accordingly processing mode with described first signal processing mode;

VI. described base station is based on the described first information that obtains, and removes signal after the processing of the described first information of described base station reception from described mixed signal, and obtains described the second information according to separating accordingly processing mode with described secondary signal processing mode.

2. method according to claim 1, it is characterized in that, described signal processing mode comprises coding and/or modulation system, the selection of described secondary signal processing mode is considered after the processing of the second information signal in the signal noise ratio at place, base station, and the selection of described first signal processing mode considers that signal is in signal and interference and the noise ratio at place, base station after the processing of the first information.

3. a method that is used for carrying out with a plurality of subscriber equipmenies multi-user's mimo communication in the base station wherein, comprises the steps:

I. receive the mixed signal of signal after the processing of signal and the second information after the processing of the first information, wherein, the selection that the second subscriber equipment sends the used secondary signal processing mode of described the second information signal is considered after the processing of the second information signal at the noise at place, base station, and the signal interference that signal produces after place, described base station is to the processing of the first information after the processing of described the second information is considered in the selection that first user equipment sends the used first signal processing mode of the described first information;

Ii. from described mixed signal, isolate the coherent signal of the described first information, and obtaining the described first information according to separating accordingly processing mode with described first signal processing mode, the coherent signal of the described first information comprises the interference of signal after the processing of described the second information;

Iii. based on the described first information that obtains, from described mixed signal, isolate the coherent signal of described the second information, the coherent signal of described the second information comprises the noise at place, base station, and obtains described the second information according to separating accordingly processing mode with described secondary signal processing mode from described mixed signal.

4. method according to claim 3 is characterized in that, the method also comprised the steps: before step I

-definite described first user equipment and described the second subscriber equipment from the subscriber equipment of this base station jurisdiction.

5. according to claim 3 or 4 described methods, it is characterized in that, described signal processing mode comprises coding and/or modulation system, signal and interference and the noise ratio that the signal of the information of described first user equipment is located in described base station considered in the selection of described first signal processing mode, and described step I i comprises:

-isolate the coherent signal of the described first information based on minimum mean square error method;

-according to decoding and/or the demodulation mode corresponding with the first signal processing mode, detect the described first information;

Described step I ii comprises:

-use continuous interference cancellation method to obtain described the second information.

6. method according to claim 5 is characterized in that, the signal noise ratio that the signal of the information of described the second subscriber equipment is located in described base station is considered in the selection of described secondary signal processing mode, and described step I ii comprises:

-according to the described first information, reduction is signal after the processing of the described first information at place, described base station;

-reduction is obtained, signal is removed from described mixed signal after the processing of the described first information at place, described base station;

-use minimum mean square error method, the coherent signal of described the second information of parsing from the described mixed signal of having removed signal after the processing of the described first information of described base station, the coherent signal of described the second information comprises noise;

-according to decoding and/or the demodulation mode corresponding with the secondary signal processing mode, based on the coherent signal of described the second information, detect described the second information.

7. method according to claim 5 is characterized in that, described method also comprised following arbitrary step before described step I:

-determine described signal and interference and noise ratio, and provide it to described first user equipment;

-determine described signal and interference and noise ratio, and determine that described first user equipment is used to provide coding and/or the modulation system of the described first information, and will indicate the indication information of this coding and/or modulation to offer described first user equipment.

8. method according to claim 6 is characterized in that, described method also comprised following arbitrary step before described step I:

-determine described signal and interference and noise ratio to reach described signal noise ratio, and it is offered respectively described first user equipment and described the second subscriber equipment;

-determine described signal and interference and noise ratio, and described signal noise ratio, determine that described first user equipment is used to provide coding and/or the modulation system of the described first information, determine that described the second subscriber equipment is used to provide coding and/or the modulation system of described the second information, and will indicate respectively the indication information of two kinds of codings and/or modulation system to offer respectively described first user equipment and described the second subscriber equipment.

9. method according to claim 3 is characterized in that, also comprises the steps: among the described step I i

Whether the described first information that-verification is obtained is correct;

The described first information that-Ruo obtains is correct, then continues described step I ii;

The described first information mistake that-Ruo obtains, then carry out following steps:

-from described mixed signal, isolate the coherent signal of described the second information, and obtain described the second information according to separating accordingly processing mode with described secondary signal processing mode.

10. method according to claim 3, it is characterized in that, described the second subscriber equipment comprises the different a plurality of subscriber equipmenies of detection priority, the signal of described the second information by the processing of these a plurality of subscriber equipmenies information separately after signal mix, wherein, each subscriber equipment sends the selection of the used coding of each self information and/or modulation system and considers that detection priority is lower than the signal interference that signal produces after place, described base station is to the processing of the information of this subscriber equipment of other each subscriber equipmenies of this subscriber equipment, and described step I ii further comprises the steps:

Iii1. according to the described first information, reduction is signal after the processing of the described first information at place, base station, and it is removed from described mixed signal;

Iii2. use minimum mean square error method, from the described mixed signal of having removed signal after the processing of the described first information of base station, parse the coherent signal of the information that detects the highest subscriber equipment of priority;

Iii3. based on the coherent signal of the information of the highest subscriber equipment of described detection priority, according to decoding and/or the demodulation mode corresponding with the used coding of the highest subscriber equipment of this priority and/or modulation system, detect the information of the highest subscriber equipment of described detection priority;

Iii4. according to the information that detects the highest subscriber equipment of priority, reduction is signal after the processing of the information of the highest subscriber equipment of the described detection priority at place, described base station, and this signal is removed from described described mixed signal of having removed signal after the processing of the described first information of base station;

Iii5. use minimum mean square error method, in the described mixed signal of signal, parse the coherent signal of the information that detects priority the second high subscriber equipment after the processing of the information of having removed the subscriber equipment that signal and described detection priority are the highest after the processing of the first information of described base station;

Iii6. based on the coherent signal of the information of described detection priority the second high subscriber equipment, according to decoding and/or the demodulation mode corresponding with the used coding of the high subscriber equipment of this priority second and/or modulation system, detect the information of the high subscriber equipment of described detection priority second;

For each signal that detects priority, repeat above step I ii4 to iii6.

11. a device that is used for carrying out with a plurality of subscriber equipmenies multi-user's mimo communication in the base station wherein, comprising:

-receiver, mixed signal for signal after the processing of signal and the second information after the processing that receives the first information, wherein, the selection that the second subscriber equipment sends the used secondary signal processing mode of described the second information signal is considered after the processing of the second information signal at the noise at place, base station, and the signal interference that signal produces after place, described base station is to the processing of the first information after the processing of described the second information is considered in the selection that first user equipment sends the used first signal processing mode of the described first information;

-one the first deriving means, be used for isolating from described mixed signal the coherent signal of the described first information, and obtaining the described first information according to separating accordingly processing mode with described first signal processing mode, the coherent signal of the described first information comprises the interference of signal after the processing of described the second information;

-one the second deriving means, be used for based on the described first information that obtains, from described mixed signal, isolate the coherent signal of described the second information, the coherent signal of described the second information is included in the noise at place, base station, and obtains described the second information according to separating accordingly processing mode with described secondary signal processing mode from described mixed signal.

12. device according to claim 11 is characterized in that, this device also comprises:

-contrast means is used for determining described first user equipment and described the second subscriber equipment from the subscriber equipment of this base station jurisdiction.

13. according to claim 11 or 12 described devices, it is characterized in that, described signal processing mode comprises coding and/or modulation system, signal and interference and the noise ratio that the signal of the information of described first user equipment is located in described base station considered in the selection of described first signal processing mode, and described the first deriving means comprises:

-one the first resolver is used for based on minimum mean square error method, parses the coherent signal of the described first information in the described mixed signal;

-one the first checkout gear is used for detecting the described first information according to decoding and/or the demodulation mode corresponding with the first processing mode;

Described the second deriving means is used for:

Use continuous interference cancellation method to obtain described the second information.

14. device according to claim 13 is characterized in that, the signal noise ratio that the signal of the information of described the second subscriber equipment is located in described base station is considered in the selection of described secondary signal processing mode, and described the second deriving means comprises:

-one reduction apparatus is used for according to the described first information, and reduction is signal after the processing of the described first information at place, described base station;

-one separator, be used for reduction is obtained, signal is removed from described mixed signal after the processing of the described first information at place, described base station;

-one the second resolver, use minimum mean square error method, resolve the coherent signal of described the second information from the described mixed signal of having removed signal after the processing of the described first information of described base station, the coherent signal of described the second information comprises noise;

-one second detection device is used for based on the coherent signal of described the second information, detecting described the second information according to decoding and/or the demodulation mode corresponding with the secondary signal processing mode.

15. device according to claim 13 is characterized in that, this device also comprises processing unit, and this processing unit is used for:

-determine described signal and interference and noise ratio, and provide it to described first user equipment; Or

-determine described signal and interference and noise ratio, determine that described first user equipment is used to provide coding and/or the modulation system of the described first information, and will indicate the indication information of this coding and/or modulation to offer described first user equipment.

16. device according to claim 14 is characterized in that, this device also comprises processing unit, and this processing unit is used for:

-determine described signal and interference and noise ratio to reach described signal noise ratio, and it is offered respectively described first user equipment and described the second subscriber equipment; Or

-determine described signal and interference and noise ratio, and described signal noise ratio, and determine that coding and/or modulation system that described first user equipment is used to provide the described first information are used to provide coding and/or the modulation system of described the second information with described the second subscriber equipment, and will indicate respectively two kinds to encode and/or the indication information of modulation system offers respectively described first user equipment and described the second subscriber equipment.

17. device according to claim 11 is characterized in that, described the first deriving means also comprises:

-one calibration equipment, whether correct for the described first information that verification is obtained;

The described first information that-Ruo obtains is correct, then described the second deriving means work;

The described first information mistake that-Ruo obtains, then described the first deriving means also is used for isolating from described mixed signal the coherent signal of described the second information, and obtains described the second information according to separating accordingly processing mode with described secondary signal processing mode.

18. device according to claim 11, it is characterized in that, described the second subscriber equipment comprises the different a plurality of subscriber equipmenies of detection priority, the signal of described the second information by the processing of these a plurality of subscriber equipmenies information separately after signal mix, wherein, each subscriber equipment sends the selection of the used coding of each self information and/or modulation system and considers that detection priority is lower than the signal interference that signal produces after place, described base station is to the processing of the information of this subscriber equipment of other each subscriber equipmenies of this subscriber equipment, and described the second deriving means further comprises:

-one reduction apparatus is used for according to the described first information, and reduction is signal after the processing of the described first information at place, base station;

-one separator is used for and will removes from described mixed signal by signal after the processing of the described first information at place, base station;

-one the second resolver be used for to use minimum mean square error method, parses the coherent signal of the information of the highest subscriber equipment of detection priority from the described mixed signal of having removed signal after the processing of the described first information of base station;

-one second detection device, be used for the coherent signal based on the information of the highest subscriber equipment of described detection priority, according to decoding and/or the demodulation mode corresponding with the used coding of the highest subscriber equipment of this priority and/or modulation system, detect the information of the highest subscriber equipment of described detection priority;

Described reduction apparatus also is used for, and according to the information that detects the highest subscriber equipment of priority, reduction is signal after the processing of the information of the highest subscriber equipment of the described detection priority at place, described base station;

Described separator also is used for, will be in the described detection priority at place, described base station after the processing of the information of the highest subscriber equipment signal from described described mixed signal of having removed signal after the processing of the described first information of base station, remove;

Described the second resolver also is used for, use minimum mean square error method, in the described mixed signal of signal, parse the coherent signal of the information that detects priority the second high subscriber equipment after the processing of the information of having removed the subscriber equipment that signal and described detection priority are the highest after the processing of the first information of described base station;

Described second detection device also is used for, coherent signal based on the information of described detection priority the second high subscriber equipment, according to decoding and/or the demodulation mode corresponding with the used coding of the high subscriber equipment of this priority second and/or modulation system, detect the information of the high subscriber equipment of described detection priority second;

Detect the signal of the subscriber equipment of priority, above reduction apparatus, separator, the second resolver and second detection device repeated work for each.

19. a base station is characterized in that, comprises according to claim 11 that in 18 each is described for carrying out the device of multi-user's mimo communication with a plurality of subscriber equipmenies.