CN101505205A - Open loop MIMO method, base station and user equipment based on direction of arrival - Google Patents

Abstract

The invention discloses an open-loop MIMO method based on direction of arrival, a base station and user equipment, which are used in the technical field of wireless transmission. The method comprises the following steps that: the user equipment is divided into low-speed, middle-speed and high-speed user equipment according to the moving speed of the user equipment; the low-speed user equipment is set to adopt a closed-loop MIMO mode, and the middle-speed and high-speed user equipment is set to adopt an open-loop MIMO mode; then a sending end measures the direction of arrival of a feedback link, and estimates a precoding matrix index number of a sending link according to the direction of arrival obtained through the measurement; a rank of an MIMO system is decided; an MIMO sending mode is decided according to the rank and the precoding matrix index number; then the MIMO mode and the rank are sent to a receiving end; the receiving end intercepts the MIMO mode and the rank; and finally, the receiving end performs feedback according to intercepted information. The invention aims at the middle-speed and high-speed user equipment to provide an open-loop MIMO system and an open-loop MIMO device based on the direction of arrival, and has the characteristics of simple design and good system performance.

Description

Open loop MIMO method, base station and subscriber equipment based on direction of arrival

Technical field

The present invention relates to a kind of wireless communications method and equipment, be specifically related to a kind of open loop MIMO method, base station and subscriber equipment, be applicable to radio transmission technical field based on direction of arrival.

Background technology

Multi-input/output antenna (MIMO) technology is considered to an important breakthrough of current wireless communication field intelligent antenna technology.MIMO is as the main means that improve system transmissions speed, and it can improve the capability of communication system and the availability of frequency spectrum exponentially under the situation that does not increase system bandwidth.Therefore, will be that this viewpoint of key technology that the third generation mobile communication system must adopt is built consensus about the MIMO technology, and be subjected to paying close attention to widely.

In view of the MIMO technology can obtain high data throughout, third generation partner planning item (3GPP) standard scheme has determined to adopt the MIMO technology.Super three generations (S3G) cell mobile communication systems, IEEE802.16 system and WiMAX wireless local area network (WLAN) system in the definition of the Long Term Evolution tissue (LTE) of 3GPP all determine to adopt the MIMO technology as a requisite key technology.802.16e agreement is supported the scheme of MIMO and AAS (adaptive antenna system), it is divided into three major types to the MIMO scheme: space diversity, spatial reuse, adaptive MIMO (promptly selecting to adopt space diversity or spatial reuse according to channel condition).LTE not only admits above-mentioned MIMO classification, and announces to support several MIMO patterns such as linear predictive coding (Precoding), spatial emission diversity, beam shaping.LTE also is divided into Single User MIMO (SU-MIMO) and multiuser MIMO (MU-MIMO) to MIMO from number of users, and up link and down link can be supported SU-MIMO and MU-MIMO.

At present; LTE has determined that the basic configuration of MIMO antenna number is descending 2 * 2 or 4 * 2, up 1 * 2; but also in the high-order antenna configuration of considering 4 * 4, and MIMO technology multimodeization: multithread precoding, beam shaping, Open-Loop Transmit Diversity adapt to different scenes.LTE is higher performance, bigger bandwidth (maximum to 100MHz), more antenna to the evolution development trend of IMT-Advanced: 8 * 4 or 8 * 8 antennas.Consider that the emission diversity scheme that adopts comprises that block coding transmits diversity (STBC, SFBC), time (frequency) switching emission diversity (TSTD, FSTD), comprise cyclic delay diversity (CDD, comprise Zero-CDD, Small-CDD and Large-CDD) delay diversity (as the basic scheme of broadcast channel), the precoding technique of selecting based on precoding vector.Precoding technique has been confirmed as the transfer scheme of multiuser MIMO scene.Because to use the feedback information (FBI) of subscriber equipment to come that transmitter is optimized design all the fashion with the thought and the method that improve the availability of frequency spectrum in the base station in based on the mimo system of precoding, therefore many companies propose based on various MIMO transmission method based on feedback information, its allows base station to adopt subscriber equipment feedack to improve the performance of whole M IMO system.

So far, the mimo system of LTE definition has proposed needs subscriber equipment (UE) feedack to comprise order (Rank), pre-coding matrix index number (PMI), the channel quality indication (CQI) information (CQI) of MIMO, the call number information such as (RBI) of Resource Block.In existing technology, at the subscriber equipment of harmonic motion speed, the base station needs subscriber equipment feedback pre-coding matrix index number (PMI) information to carry out precoding processing.This system is considered to a kind of closed-loop MIMO system based on feedback PMI information.At the subscriber equipment of medium and high movement velocity, BS does not need UE feedback PMI information, carries out precoding processing and adopt based on fixing PMI or based on cycle P MI or based on pre-coding matrix index number jump methods such as (PMH).

But, based on the method for fixing PMI or based on cycle P MI or based on the method for PMH is a kind of open loop MIMO method in essence, because it need not the precoding processing that PMI information is carried out transmitting terminal, this system is considered to a kind of open loop MIMO system that need not to feed back PMI information.Because the PMI information of open loop MIMO method is not the UE feedback, so the precision of PMI information is not high, thereby causes the performance of open loop MIMO system to be subjected to great influence.Therefore be necessary to seek better open loop MIMO method of a kind of performance and device.

Canada Northern Telecom (Nortel) company has delivered R1-073977 motion " order 1 and order 2 sending methods in the subscriber equipment of high translational speed (Rank-1 andRank-2 Transmission for High Mobility UE) " in the 50bis time meeting of 3GPP LTE RAN1 that Chinese Shanghai is held-12 days on the 8th October in 2007, this motion mentioned in the high speed open loop MIMO system based on sky frequently block code (SFBC), based on sky frequency block code and Frequency Switched Transmit Diversity (SFBC+FSTD), based on MIMO methods such as PMH.The method of PMH be can not determine PMI accurately.Therefore, the systematic function based on the MIMO method of PMH is still waiting to improve.

U.S. Infineon Technologies Corp. has delivered R1-074436 motion " under the high-doppler in the open loop MIMO down link rank adaptation of four transmitting antennas (Down Link RankAdaptation with 4 Transmit Antennas for Open Loop MIMO at HighDoppler) " in the 50bis time meeting of 3GPPLTE RAN1 that Chinese Shanghai is held-12 days on the 8th October in 2007, this motion has been mentioned in the high speed open loop MIMO system based on SFBC+FSTD with based on the sky MIMO method of block code and spatial reuse (SFBC-SM) frequently.In view of the transmitting terminal of PMI divided ring mimo system is unknown, the PMI value helps the raising of systematic function accurately, and the method does not propose the method for decision PMI.Therefore, systematic function is not greatly improved.

South Korea's LG Electronics Inc has delivered R1-074746 motion " about the thinking (Consideration on Open-loop SM TransmissionMode) of the multiplexing sending mode of open loop " in the 51st meeting of 3GPP LTE RAN1 that Korea S's Jizhou Island is held-9 days on the 5th November in 2007.This motion has been mentioned based on fixing PMI, based on the MIMO method of Open-Loop Spatial Multiplexing (OL SM) such as cycle P MI.Because based on fixing PMI, inaccurate based on the PMI value of OL-MIMO systems such as cycle P MI, so systematic function is still waiting raising.

In view of the precoder of PMI divided ring mimo system is unknown, if precoder not accurately PMI information carry out precoding processing, thereby the performance of mimo system can not be further improved.Therefore, be necessary to seek a kind of efficient and simple and practical open loop MIMO method to improve the performance of system.

Summary of the invention

The objective of the invention is to seek deficiency of the prior art, open loop MIMO method, base station and subscriber equipment based on direction of arrival are provided in a kind of wireless communication system, by the measurement result of DOA being obtained the estimated value of PMI, carry out the precoding processing of open loop MIMO system again according to PMI, than traditional method, the open loop MIMO method efficient that the present invention proposes is high and be easy to realize.

The present invention is achieved by the following technical solutions, at first, the movement velocity of UE measured, and according to the movement velocity that measures UE is divided into low speed UE, middling speed UE, high speed UE; Then, low speed user is set adopts the closed-loop MIMO pattern, middling speed user and highspeed user are set adopt the open loop MIMO pattern; Again DOA is measured; According to the DOA that measures the MIMO send mode is set; Whether decision adopts the rank adaptation mode again, if adopt the rank adaptation mode, determines a certain order (Rank) adaptive mode; At last, send MIMO mode and order information.

In one aspect of the invention, a kind of open loop MIMO method based on direction of arrival has been proposed, at down link, comprise step: the movement velocity to subscriber equipment is measured, and described subscriber equipment is divided into the first kind or second class according to measured movement velocity, wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment; For first kind subscriber equipment is provided with the closed-loop MIMO pattern, and be that the second class subscriber equipment is provided with the open loop MIMO pattern; The base station is measured the direction of arrival of up link, and estimates the pre-coding matrix index number of down link according to the direction of arrival of up link; Base station decision down link adopts the mode of which kind of rank adaptation to carry out the decision of order; The base station determines MIMO send mode in the down link according to the pre-coding matrix index number and the order of down link; The base station sends MIMO pattern, MIMO send mode, order, pre-coding matrix index number to subscriber equipment by downlink signaling; Subscriber equipment is intercepted send mode, the order of the MIMO pattern that is loaded with down link sent the base station, MIMO, the downlink signaling of pre-coding matrix index number; MIMO pattern, MIMO send mode and the order of subscriber equipment basis down link separately adopts feedback scheme separately, when needing feedback, then according to described feedback scheme feedback information sent to the base station; Wireless resource scheduling and distribution are carried out according to the feedback information of subscriber equipment in the base station, and send data to described subscriber equipment; Subscriber equipment carries out demodulation according to self classification, MIMO pattern, the send mode of MIMO, order, pre-coding matrix index number to the data that receive.

In another aspect of this invention, a kind of open loop MIMO method based on direction of arrival is provided, at down link, comprise step: the movement velocity to subscriber equipment is measured, and described subscriber equipment is divided into the first kind and second class according to measured movement velocity, wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment; For first kind subscriber equipment is provided with the closed-loop MIMO pattern, and be that the second class subscriber equipment is provided with the open loop MIMO pattern; Base station and subscriber equipment are measured the direction of arrival of up link and down link respectively, and estimate the pre-coding matrix index number of down link and up link respectively according to the direction of arrival of up link and down link; The base station decision adopts the mode of which kind of rank adaptation to carry out the decision of order; The base station determines MIMO send mode in the down link according to the pre-coding matrix index number and the order of down link; The base station sends MIMO pattern in order, the down link, MIMO send mode to subscriber equipment by downlink signaling; Subscriber equipment is intercepted the downlink signaling that is loaded with MIMO pattern in order, the down link, MIMO send mode that send the base station; Subscriber equipment basis MIMO pattern, MIMO send mode and order separately adopts feedback scheme separately, when needing feedback, then according to described feedback scheme feedback information sent to the base station; Wireless resource scheduling and distribution are carried out according to the feedback information of subscriber equipment in the base station, and send data to described subscriber equipment; Subscriber equipment carries out demodulation according to self classification, MIMO pattern, the send mode of MIMO, order, pre-coding matrix index number to the data that receive.

In one side more of the present invention, open loop MIMO method based on direction of arrival has been proposed in a kind of wireless communication system, at up link, comprise step: the movement velocity to subscriber equipment is measured, and described subscriber equipment is divided into the first kind and second class according to measured movement velocity, wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment; For first kind subscriber equipment is provided with the closed-loop MIMO pattern, and be that the second class subscriber equipment is provided with the open loop MIMO pattern; The base station is measured the direction of arrival of up link and down link, and estimates the pre-coding matrix index number of down link and up link respectively according to the direction of arrival of up link and down link; Base station decision up link adopts the mode of which kind of rank adaptation to carry out the decision of order; The pre-coding matrix index number of the down link that the base station basis obtains, and consider that MIMO pattern, order are with MIMO send mode in the decision up link; The base station sends the MIMO pattern, MIMO send mode, order of up link to subscriber equipment by downlink signaling; Subscriber equipment is intercepted the MIMO pattern of sending the base station that is loaded with up link, the send mode of MIMO, the downlink signaling of order; Feedback scheme is adopted according to MIMO pattern, the MIMO send mode of the up link of described subscriber equipment in the base station, when needing feedback, then according to described feedback scheme feedback information is sent to described subscriber equipment; Scheduling of resource is carried out to described subscriber equipment in the base station, and the mode of schedule information by downlink signaling is notified to described subscriber equipment; MIMO pattern, MIMO mode, order, the schedule information of the up link that subscriber equipment sends according to the base station send data to the base station; The data that receive according to information butt joint such as the send mode of described subscriber equipment MIMO pattern, MIMO, order, pre-coding matrix index numbers the base station are carried out demodulation.

In still another aspect of the invention, proposed a kind of base station, having comprised: the tachometric survey unit is used to measure the movement velocity of at least one subscriber equipment, described subscriber equipment is divided into the first kind and second class, and wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment; Division unit is used for movement velocity according to this subscriber equipment and is defined as it open loop MIMO or closed-loop MIMO are set; The direction of arrival measuring unit is used to measure the direction of arrival of up link; The pre-coding matrix index number estimation unit is used for the pre-coding matrix index number based on the direction of arrival estimating down-ward link of this up link; The order determining unit; Be used for determining the adaptive mode of order; And MIMO mode determining unit, be used for determining the MIMO mode according to the adaptive mode and the pre-coding matrix index number of determined order.

In still another aspect of the invention, proposed a kind of subscriber equipment, having comprised: intercepted the unit, intercept send mode, the order of the MIMO pattern that is loaded with down link sent the base station, MIMO, the downlink signaling of pre-coding matrix index number; And demodulating unit, according to self kind, MIMO pattern, the send mode of MIMO, order, pre-coding matrix index number the data that receive are carried out demodulation.

In still another aspect of the invention, proposed a kind of subscriber equipment, having comprised: the direction of arrival measuring unit is used to measure the direction of arrival of down link; The pre-coding matrix index number estimation unit is used for the pre-coding matrix index number based on the direction of arrival estimating uplink of down link, as the pre-coding matrix index number of down link; Intercept the unit, intercept the MIMO pattern of sending the base station that is loaded with down link, the send mode of MIMO and the downlink signaling of order; And demodulating unit, according to self send mode, order, the pre-coding matrix index number of down link of kind, MIMO pattern, MIMO the data that receive are carried out demodulation.

In still another aspect of the invention, proposed a kind of base station, having comprised: the direction of arrival measuring unit is used to measure the direction of arrival of up link; The pre-coding matrix index number estimation unit is used for the direction of arrival estimating down-ward link pre-coding matrix index number based on this up link, as the pre-coding matrix index number of up link; Receiving element receives the message from its described classification of expression of subscriber equipment; The order determining unit; Be used for determining the adaptive mode of order; And MIMO mode determining unit, be used for determining the MIMO mode according to the pre-coding matrix index number of determined sum of ranks up link.

In still another aspect of the invention, proposed a kind of subscriber equipment, having comprised: the tachometric survey unit is used to measure the movement velocity of at least one subscriber equipment, described subscriber equipment is divided into the first kind and second class, and wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment; Division unit is used for movement velocity according to this subscriber equipment and is defined as it open loop MIMO or closed-loop MIMO are set; The direction of arrival measuring unit is used to measure the direction of arrival of down link; The pre-coding matrix index number estimation unit is used for the pre-coding matrix index number based on the direction of arrival estimating uplink of this down link; The feedback information transmitting element sends to the base station with the information of representing described classification.

Essence of the present invention is by DOA is measured, and utilizes the measurement of DOA to estimate PMI, thus decision MIMO send mode.Than closed-loop MIMO mode based on the PMI feedback, what the present invention proposed need not the feedback of PMI based on the open loop MIMO mode of DOA, saved valuable signaling consumption undoubtedly, but it is undeniable, because the present invention is the open loop MIMO mode in essence, systematic function decreases than the closed-loop MIMO mode based on the PMI feedback; Than the MIMO mode based on non-definite PMI (PMI, cycle P MI, PMH at random), the open loop MIMO mode based on DOA that the present invention proposes estimates PMI by DOA, thereby has better system performance.Although the present invention proposes to adopt the open loop MIMO mode based on DOA in middling speed and high speed UE, the open loop MIMO mode based on DOA that the present invention proposes also can adopt in low speed UE.In addition, consider that up link and down link all have DOA, so the open loop MIMO mode based on DOA that the present invention proposes can adopt in up link or down link.Moreover, consider that the measurement of TDD mode (TDD) downlink and uplink and down link DOA is symmetric, so the open loop MIMO mode based on DOA that the present invention proposes can be used under tdd mode undoubtedly; The measurement of considering Frequency Division Duplexing (FDD) (FDD) pattern downlink and uplink and down link DOA also is roughly symmetrical, therefore the open loop MIMO mode based on DOA of the present invention's proposition also can be used under fdd mode, especially has the angular spread circlet border of line-of-sight propagation (LOS) or DOA.Therefore, the open loop MIMO mode that the present invention proposes based on DOA, can be applied respectively according to actual conditions, can be the third generation (3G), super three generations (S3G), the 4th generation (4G) cellular mobile communication and Digital Television, wireless lan (wlan), self-organizing network (Mesh, Ad Hoc, Censor Network), the MIMO scheme of digital home network (e-Home), wireless wide area network systems such as (WWAN) provides important theory foundation and concrete implementation method.

Description of drawings

From the detailed description below in conjunction with accompanying drawing, above-mentioned feature and advantage of the present invention will be more obvious, wherein:

Fig. 1 is the MIMO mode according to down link in the wireless area of the embodiment of the invention;

Fig. 2 is a schematic diagram of explaining the implication of direction of arrival;

Fig. 3 is the figure of the relation of explanation movement velocity of subscriber equipment and base station mode;

Fig. 4 shows 2 * 2 down link SU-MIMO system schematic according to first embodiment of the invention;

Fig. 5 shows the structured flowchart according to the base station of first embodiment of the invention;

Fig. 6 shows the structured flowchart according to the subscriber equipment of first embodiment of the invention;

Fig. 7 shows the mapping relations figure of order in as shown in Figure 4 the SU-MIMO system, code word, layer;

Fig. 8 is the flow chart of describing according to the detail operations process of the base station of the embodiment of the invention and subscriber equipment;

Fig. 9 shows the schematic diagram of the direction of arrival measurement of up link in 2 * 2 antenna SU-MIMO systems;

Figure 10 shows the modification according to the subscriber equipment of first embodiment of the invention;

Figure 11 shows the schematic diagram of estimating PMI according to DOA;

Figure 12 shows the mapping relations of the DOA and the PMI of HH code book;

Figure 13 shows the schematic diagram of periodic feedback information;

Figure 14 shows the schematic diagram of aperiodicity feedback information;

Figure 15 shows the schematic diagram according to second embodiment of the invention 4 * 4 down link MU-MIMO systems;

Figure 16 shows the structured flowchart according to the base station of second embodiment of the invention;

Figure 17 shows the structured flowchart according to the subscriber equipment of second embodiment of the invention;

Figure 18 illustrates the mapping relations figure of order in the MU-MIMO system for example shown in Figure 15, code word, layer;

Figure 19 shows the flow chart of explanation according to the detail operations process of the base station of second embodiment of the invention and subscriber equipment;

Figure 20 shows the modification according to the subscriber equipment of second embodiment of the invention;

Figure 21 shows the schematic diagram that the up link direction of arrival is measured in 4 * 4 antenna MU-MIMO systems;

Figure 22 shows the schematic diagram according to third embodiment of the invention 4 * 4 up link MU-MIMO systems;

Figure 23 shows the structured flowchart according to the base station of third embodiment of the invention;

Figure 24 shows the structured flowchart according to the subscriber equipment of third embodiment of the invention;

Figure 25 shows the schematic diagram of measuring according to the direction of arrival of the down link of third embodiment of the invention; And

Figure 26 shows the flow chart of explanation according to the detail operations process of the base station of third embodiment of the invention and subscriber equipment.

Embodiment

To a preferred embodiment of the present invention will be described in detail, having omitted in the description process is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.

As mentioned above, 3GPP LTE has determined the MIMO technology of support based on precoding, and as a kind of antenna territory MIMO signal processing is converted into wave beam (beam) territory method for processing signals based on the MIMO technology of precoding, be a kind of technology in essence based on beam shaping.Precoding technique can be realized simple relatively linear receiver at UE, but adopt normalization (Unitary) still non-normalized (Non-unitary), adopting code book (Codebook) feedback also is non-code book (Non-codebook) feedback, and further research awaits.In addition, the design of the size of code book, concrete method for precoding, feedback information and whether signaling is adopted problem (this problem relates generally to the use of smart antenna) such as precoding technique is among all studying.It is pointed out that intelligent antenna technology is counted as a kind of special case of precoding technique in LTE research work at present.And in beam forming technique, (Directionof arrival, DOA) technology is a kind of technology that has been used at beam shaping to direction of arrival.

For time division duplex (TDD) system, the frequency of uplink and downlink is identical, can directly estimate to form downlink wave beam by the space characteristics of upward signal.In Frequency Division Duplexing (FDD) (FDD) system, uplink and downlink frequency difference, DOA is the tie of up-downgoing contact, is unique foundation that downlink wave beam forms.At present, can be accurately and to measure the algorithm of DOA simply too numerous to enumerate, typical algorithm comprises multiple signal classification method (MUSIC), invariable rotary technology estimated signal parametric method (ESPRIT) etc.

According to embodiments of the invention, descending MIMO technology (SU-MIMO and MU-MIMO) is based on the thought that fixed beam is shaped among the LTE at present, (for example that is to say according to designing requirement, the size of code book) adopts certain algorithm to generate required number of beams (just several codebook vectors or matrix) in the space, promptly form code book and be stored among BS and the UE.During real work, UE (for example optimizes criterion according to certain, maximum principle of power system capacity or error rate minimum criteria), select a certain codebook vectors or matrix, and its call number (PMI) fed back to BS, BS takes out its corresponding codebook vectors or matrix and the data flow of UE is carried out precoding processing according to PMI from code book.

Owing to arrive the many in signal is dispersed in a narrower angle usually (referring to Gregory D.Durgin. " Space-Time Wireless Channels " 198-199 page or leaf) of BS from UE, and the thought of adaptive beamforming is to utilize up DOA to estimate to generate the downlink wave beam of UE, be that BS aims at this user with emitted energy, promptly DOA is exactly the direction in strong path (number is the 9th page of 200580020526.5 patent " closed-loop MIMO system of the code book that utilization is used to feed back " referring to the Chinese patent application of Intel application) between transmitting terminal and the receiving terminal.

Therefore, the inventor has found relation between DOA and the PMI (for example, 0-15 ° of of angle of when DOA is, corresponding No. 1 PMI, 15～30 ° of of angles of when DOA is, corresponding No. 4 PMI) R1-073353 motion " thinking of the selection of MU-MIMO codebook subset and signaling among the E-UTRA (MU-MIMO Codebook Subset Selection and SignalingConsideration for E-UTRA) " has been delivered in the 50th meeting of 3GPP LTE RAN1 that can further hold at Athens, GRE-24 days on the 20th August in 2007 with reference to American I nterDigital communication common carrier of the relation of .Notice that these corresponding relations are that off-line generates and whether code book is that it doesn't matter in regular ordering.DOA and PMI; This motion points out that the design of precoding MIMO code book is exactly to utilize beam forming vector in the beam forming technique to have the characteristics of spatial directivity, and namely suitable DOA not only can improve systematic function but also can suppress and disturbs. What the inventor thought that the LTE system adopts all realizes the mapping relations of DOA to PMI based on the precoding codebook of discrete Fourier transform (DFT) are with based on the precoding codebook of Householder (HH) (DFT), wherein can directly obtain the mapping relations of DOA and PMI based on the PMI of DFT code book, if and define 1～16 grade of (PMI=0 based on the PMI of HH code book, 1 ..., 15), then preceding 8 grades of (PMI=0,1 ..., 7) and can realize the mapping with PMI.Back 8 grades (PMI=8 ..., 15) and be considered to replenishing of DOA direction and PMI mapping relations.In the LTE51th bis meeting of holding in January, 2008.The PMI scheme of the open loop MIMO system that many communication common carriers propose is as follows, 16 grades of PMI value (PMI=0 altogether, 1,15), transmitting terminal adopts the scheme of cycle P MI or PMH, and promptly transmitting terminal selects a value once to send the PMI value of data as certain in 4 PMI values (PMI=12,13,14,15) of value maximum.The inventor thinks that 4 maximum PMI values of above-mentioned selection are not too appropriate as the PMI value of open loop MIMO method, because if adopt code book based on HH, the little PMI value of so preceding 8 values can find the mapping relations with DOA, the DOA of the PMI value representative that last 4 values are big is omnidirectional, and UE can only be on some directions, transmitter distributes power on omnirange, certainly will cause the waste of transmitting power and power system capacity to descend so.As seen, can't find PMI=12,13,14,15 and the mapping relations of DOA according to prior art.Therefore, if adopt PMI=12,13,14,15 can not make full use of the spatial character of DOA based on cycle P MI or based on the OL-MIMO method of PMH, systematic function can not get further raising.

Consider that prior art (comprising above motion) never proposes based on direction of arrival (Direction of arrival, DOA) open loop MIMO method, the inventor proposes to use the PMI information that DOA information decides mimo system in middling speed and open loop MIMO system at a high speed, carry out precoding processing based on PMI information again, thereby improve the throughput of mimo system greatly.

In the wireless area distribution of BS and UE as shown in Figure 1, down link comprises BS 300, central user equipment (center UE), edge customer equipment (edge UE).Center UE comprise UE 100 based on the open loop MIMO of DOA, based on the UE101 of the closed-loop MIMO of PMI, based on sky frequently the open loop MIMO of block code (SFBC) UE 102, based on sky frequently block code and send the UE 103 of the open loop MIMO of diversity (SFBC+FSTD), based on the UE 104 of the fixing open loop MIMO of PMI, based on the UE 105 of the open loop MIMO of PMH, based on the UE 106 of the open loop MIMO of cycle P MI.Edge UE comprise UE 200 based on the open loop MIMO of DOA, based on the UE 201 of the closed-loop MIMO of PMI, based on sky frequently the open loop MIMO of block code (SFBC) UE 202, based on sky frequently block code and send the UE 203 of the open loop MIMO of diversity (SFBC+FSTD), based on the UE 204 of the fixing open loop MIMO of PMI, based on the UE 205 of the open loop MIMO of PMH, based on the UE 206 of the open loop MIMO of cycle P MI.

Various MIMO methods shown in Fig. 1 all can be applied in SU-MIMO, MU-MIMO.The open loop MIMO technology based on direction of arrival (DOA) that the present invention proposes obtains adopting in the subscriber equipment 100 of down link and edge customer equipment 200.Direction of arrival, DOA (Dirercetion of Arrival also can claim AOA, Angle of Arrival) is meant that radio wave arrives the direction of aerial array.If the radio wave that arrives satisfies far field condition, can be similar to and think that the wavefront of radio wave is a plane, the angle between plane wave front and array axis or array normal is direction of arrival (DOA).As shown in Figure 2, the angle between plane wave front and array axis is

, and the angle between horizontal plane is θ, angle

Or θ can unique definite signal incident direction.As shown in Figure 2, the distance between the aerial array is Δ x.The relation of the MIMO mode that adopt the movement velocity of UE and base station as shown in Figure 3, wherein the open loop MIMO mode based on DOA is proposed for the first time by the inventor.

Though be at medium speed or high-speed UE among the following embodiment, the technology based on the MIMO of DOA of not denying that the inventor proposes can be applied among low velocity or the static UE.In addition, the technology based on the MIMO of DOA that the present invention proposes has very strong versatility, can be applied to the mimo system that diversity mode such as SU-MIMO system, MU-MIMO system, beamforming system, precoding MIMO system, open loop MIMO mode and CDD (zero CDD, little CDD, big CDD), SFBC, FSTD or multiplex mode make up.

Although what the embodiment of the invention proposed is to estimate to obtain according to the measurement result of DOA based on PMI information in the MIMO technology of DOA, but can not get rid of following situation takes place: in same wireless area, at MIMO method and device that each UE adopted is not changeless, but can change.In same wireless area, at different UEs can adopt MIMO technology respectively based on DOA, based on the MIMO technology of fixing PMI, based on the MIMO technology of PMH, based on MIMO technology of cycle P MI etc., as shown in Figure 1.In same wireless area, under different situations, can adopt different MIMO technology respectively at same UE.

[first embodiment]

Fig. 4 shows 2 * 2 down link SU-MIMO system schematic according to first embodiment of the invention.As shown in Figure 4, all possess two antennas according to base station 300 and the subscriber equipment of first embodiment, wherein subscriber equipment 200-1 and 200-2 by up link to information such as base station 300 feedback CQI and Rank.In view of subscriber equipment 200-1 and 200-2 have identical structure, be that example is described in detail with subscriber equipment 200-1 below.

Fig. 5 shows the structured flowchart according to the base station of first embodiment of the invention, and Fig. 6 shows the structured flowchart according to the subscriber equipment of first embodiment of the invention.

As shown in Figure 5, the base station according to first embodiment of the invention comprises radio frequency unit 117, tachometric survey unit 110, direction of arrival measuring unit 118, division unit 111, order determining unit 112, MIMO mode determining unit 113, PMI estimation unit 114, MIMO mode and order notification unit 116 and resource allocation and data transmission unit 115.

As shown in Figure 6, the subscriber equipment according to first embodiment of the invention comprise radio frequency unit 210, intercept unit 212, demodulating unit 213, data processing unit 214 and feedback information transmitting element 211.

Describe the specific operation process of above-mentioned each unit and annexation each other in detail below in conjunction with Fig. 7 and Fig. 8.Fig. 8 is the flow chart of describing according to the detail operations process of the base station of the embodiment of the invention and subscriber equipment.

As shown in Figure 8, in first embodiment of the invention, carry out the measurement of DOA and the estimation of PMI in base station side, and subscriber equipment is not to base station feedback PMI information.

2 * 2 antenna SU-MIMO systems adopt the SU-MIMO structure of LTE definition, as shown in Figure 4.In the descending SU-MIMO of LTE system, adopt the mapping mode of fixed codeword, adopt the mapping relations of order, code word, layer among the SU-MIMO as shown in Figure 7 to layer.Present embodiment adopts the mode of rank adaptation and order 2 (Rank2), UE200-1 can take CW1 and two code words of CW2 among Fig. 7 simultaneously, UE200-2 can adopt the mode of rank adaptation, and promptly UE200-2 can take the CW1 code word among Fig. 7 or take CW1 simultaneously and two code words of CW2.

As shown in Figure 8, at step S100, tachometric survey unit 110 carries out the measurement of the movement velocity of subscriber equipment, by the speed of determining each subscriber equipment they is divided into corresponding classification.

The movement velocity of all UE of the 110 pairs of whole wireless areas in tachometric survey unit is measured, and according to measured movement velocity all UE is divided into low speed user, middling speed user, highspeed user.Movement velocity is measured in tachometric survey unit 110 can be based on up transmission symbol (UL RS), Random Access Channel (RACH), uplink detection channel (UL Sounding).

At step S101, division unit 111 is carried out the division of open loop MIMO and closed-loop MIMO based on the speed of measured subscriber equipment.

Division unit 111 is different with highspeed user's device category according to low speed user equipment, middling speed subscriber equipment, low speed UE is set adopts the closed-loop MIMO pattern, middling speed UE and high speed UE is set adopts the open loop MIMO pattern.

At step S102, direction of arrival measuring unit 118 is carried out the measurement of the direction of arrival of each subscriber equipment.

In the down link, the direction of arrival measuring unit 118 of base station the subscriber equipment 200-1 of up link and the direction of arrival of 200-2 are measured.

At present, the DOA estimation problem has obtained paying close attention to widely and deep research in mobile communication, comparative maturity and be applicable to that the DOA method of estimation of mobile communication system comprises multiple signal classification method (MUSIC), invariable rotary technology estimated signal parametric method (ESPRIT), subspace method, maximum likelihood method etc.In the present embodiment, the measuring principle of DOA as shown in Figure 9, in one 2 * 2 descending SU-MIMO system, there are 2 transmitting antennas the base station, subscriber equipment 200-1 has 2 antennas, TOT represents subscriber equipment 200-1 to the distance between the base station, the coordinate of base station be (Xs, Ys), the coordinate of subscriber equipment 200-1 is (Xc, Yc), because the base station can obtain its coordinate from the GPS positioner, then can draw the relation of following equation group (1) expression:

$\left\{\begin{array}{c}\frac{\mathrm{Yc}}{\mathrm{Xc}}=\tan \mathrm{\θ}\\ \sqrt{{(\mathrm{Xs}-\mathrm{Xc})}^2+{(\mathrm{Ys}-\mathrm{Yc})}^2}=c.\mathrm{TOT}\end{array}\right.---\left(1\right)$

In equation group (1), c represents constant, and (Xc Yc), then is easy to obtain direction of arrival angle θ by equation group (1) can to use location algorithm to estimate the coordinate of subscriber equipment 200-1.

The principle of DOA estimation PMI as shown in figure 11, the base station is to the MIMO send mode of subscriber equipment in the 300 decision down links of base station, base station 300 is decided to be 0 °-120 ° to the covering space of wireless area, think that the space is a vector quantization and equally distributed, then every 15 ° be a DOA interval, there are DOA1～DOA8 totally 8 intervals in the space.Defining 2 * 2 antenna SU-MIMO PMI of system grades again is 1～8 grade, and then base station 300 can estimate the value of PMI from DOA.Note, the mapping relations of DOA and PMI are not linear among Figure 11, but in fact the mapping relations of DOA and PMI are that off-line generates, can be linearity one to one, also can be non-linear one to one non-, it be that the set of rule off-line generates and stores in BS and UE.In the mimo system of LTE definition, the linearity that can directly obtain DOA and PMI based on the DFT code book is mapping relations one to one, and are non-linear one to one non-based on the DOA of HH code book and PMI.For example, if PMI=0,1 ..., 15 totally 16 grades, the present invention can take approximate processing, get PMI=0,1 ..., 7, think PMI=8 ..., 15 back 8 grades be preceding 8 grades replenishing and can giving up, PMI=0 then, 1 ..., 7 with the mapping relations of DOA as shown in figure 12.

As mentioned above, the mapping relations of DOA and PMI are not linear among Figure 11 and Figure 12, but in fact the mapping relations of DOA and PMI are that off-line generates, can be linearity one to one, also can be non-linear one to one non-, it be that the set of rule off-line generates and stores in base station and subscriber equipment.

At step S103, the order determining unit 112 of base station is determined the mode of rank adaptation.

In the down link, the order determining unit 112 of base station determines whether down link adopts the mode of rank adaptation to decide the value of order.In the present embodiment, as shown in Figure 4, at subscriber equipment 200-1 and 200-2, the mode of Rank2 and rank adaptation is determined to adopt in base station 300.Consider that subscriber equipment 200-1 is center UE and have good Channel Transmission environment, then the order determining unit 112 of base station determines that subscriber equipment 200-1 adopt the mode of Rank2, and promptly subscriber equipment 200-1 can take CW1 and two code words of CW2 among Fig. 7 simultaneously.Consider that subscriber equipment 200-2 is edge UE and have comparatively abominable Channel Transmission environment, then base station 300 determines that subscriber equipment 200-2 adopts the mode of rank adaptation, being base station 300 can adopt Rank1 to the order of subscriber equipment 200-2 down link, also can adopt Rank2, as shown in Figure 7.In this embodiment, subscriber equipment 200-2 is edge UE, employing is based on the rank adaptation mode of the Signal to Interference plus Noise Ratio (SINR) of long-time statistical, when periodic feedback, as shown in figure 13, when subscriber equipment 200-2 uses Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH) periodic feedback CQI information, need not feed back PMI information, but will feed back Rank information.At this moment, when subscriber equipment 200-2 calculate based on the SINR of long-time statistical hour, adopt the feedback system of Rank1; When big, adopt the feedback system of Rank2 based on the SINR of long-time statistical when what subscriber equipment 200-2 calculated.

When aperiodicity was fed back, as shown in figure 14, subscriber equipment 200-2 used PUSCH aperiodicity feedback CQI and Rank information, adopted the mode based on the SINR of long-time statistical during feedback Rank information.

At step S104, MIMO mode determining unit 113 is carried out determining of MIMO mode.

In the down link, the base station is according to PMI and Rank decision MIMO mode.As shown in Figure 4, at subscriber equipment 200-1 and 200-2, PMI and Rank decision MIMO mode that the MIMO mode determining unit 113 of base station 300 estimates according to the direction of arrival of subscriber equipment 200-1 and 200-2.When the SINR that subscriber equipment 200-2 calculates based on long-time statistical less (during SINR＜5dB), adopt the feedback system of Rank1, base station 300 and subscriber equipment 200-2 constitute 2 * 2 SU-MIMO system, then down link adopts the mode that sends diversity, and transmit diversity can adopt based on SFBC or alternate manner.When subscriber equipment 200-2 calculate based on the SINR of long-time statistical big (SINR〉5dB) time, adopt the feedback system of Rank2.At this moment, the PMI estimation unit 114 of base station 300 estimates the PMI value according to the DOA of subscriber equipment, selects precoding vectors according to the PMI value then, thereby realizes the MIMO send mode based on precoding.

At step S105, MIMO mode and order notification unit 116 are to determined MIMO mode of notification of user equipment and order mode.

In the down link, base station 300 sends the subscriber equipment of information such as MIMO pattern, MIMO send mode, movement velocity, pre-coding matrix index number to wireless area by downlink signaling.MIMO mode and order determining unit 116 can send information such as above-mentioned MIMO pattern, MIMO send mode, movement velocity, pre-coding matrix index number to subscriber equipment by PDCCH or PDSCH or BCH.For saving link overhead, these information can the off-line configuration become abstract pattern, and the base station sends these abstract patterns to the frequency spectrum resource of subscriber equipment with the saving down link by PDCCH or PDSCH.

At step S106,, intercept 212 pairs of MIMO modes in unit and order mode and intercept at the subscriber equipment end.In the down link, subscriber equipment intercept the downlink signaling that information such as the send mode that is loaded with MIMO pattern, MIMO that sends the base station, movement velocity, pre-coding matrix index number are intercepted in unit 212.

At step S107, the feedback information transmitting element of subscriber equipment 211 sends feedback information by up link to the base station.

In the up link, MIMO pattern, MIMO send mode and the velocity information of subscriber equipment basis down link separately adopts feedback scheme separately, when needing feedback, then feedback information sent to the base station.For low speed user equipment, give the base station as the subscriber equipment among Fig. 1 101 and 201,101 and 201 feedback CQI, PMI, Rank, Resource Block call number information, constitute closed-loop MIMO system.For middling speed or highspeed user's equipment, as 100 among Fig. 1,102,103,104,105,106,200,202,203,204,205,206, these subscriber equipment feedbacks CQI, Rank, Resource Block call number information are given the base station, do not feed back PMI information and give BS100.

At step S108, radio frequency unit 117 receiving feedback informations of base station and resource allocation and data transmission unit 115 carry out resource allocation based on the feedback information that receives and data send.

In the down link, the resource allocation of base station and data transmission unit 115 are carried out Radio Resource and are carried out scheduling of resource and distribution and send data to subscriber equipment according to the feedback information of subscriber equipment.

At step S109, subscriber equipment receives the signal that the base station sends by radio frequency unit 210, and demodulates the data of transmission by demodulating unit 213.In the down link, the data that the demodulating unit 213 of subscriber equipment is received according to self kind, MIMO pattern, the send mode of MIMO, order, pre-coding matrix index number information butt joint such as (PMI) are decoded.Then, 214 pairs of data of data processing unit are handled, so that present.

Among above-described first embodiment and not mentioned subscriber equipment method that the DOA of down link is measured.Be to save signaling consumption, can adopt the method for simultaneously DOA being measured in base station and subscriber equipment both sides.Figure 10 shows the modification according to the subscriber equipment of first embodiment of the invention.According to this modification, carry out the measurement of direction of arrival and determining of PMI in user equipment side, simultaneously, carry out the estimation of direction of arrival and PMI in base station side.Promptly, the pre-coding matrix index number that base station and subscriber equipment estimate down link and up link separately according to the up direction of arrival that measures and descending direction of arrival separately, the PMI of down link regarded the PMI of the up link that estimates as by subscriber equipment.

The Chinese patent application of Chengdu University of Electronic Science and Technology application number is to have introduced the method that a kind of principle of interference that how to utilize radio wave is measured down link DOA in 200410022117.6 the patent " utilizing principle of interference to estimate the method for coherent signal DOA ".The Chinese patent application of China's Huawei Company application number is to point out to utilize the result and the statistical signal processing method of path estimation in 01119301.8 the patent " a kind of Wave arrival direction estimating method based on Path selection ", in conjunction with channel evaluation data, be easy to estimate the DOA parameter.Owing at the UE end, how to be easy to obtain through data and channel evaluation data, the DOA parameter of therefore measuring down link also is feasible.In addition, also can adopt DRS (Dedicated Reference Signal) to estimate the method for DOA, promptly send DRS (Dedicated Reference Signal) at the BS end and distinguish a plurality of UE in the wireless area, UE estimates DOA according to DRS (Dedicated Reference Signal).

As shown in figure 10, the modification according to the subscriber equipment of first embodiment of the invention comprise radio frequency unit 210, intercept unit 212, demodulating unit 213, data processing unit 214 and feedback information transmitting element 211, direction of arrival measuring unit 215 and PMI determining unit 216.As mentioned above, when base station side was carried out the estimation of the measurement of DOA and PMI, the descending DOA that carries out subscriber equipment self in user equipment side measured, and estimates corresponding PMI by mode same as described above.

As seen, by in the two, carrying out aforesaid operations simultaneously, thereby removed from each other to the transmission of DOA information and PMI.

[second embodiment]

Figure 15 shows the schematic diagram according to 4 * 4 down link MU-MIMO systems of second embodiment of the invention.As shown in figure 15, possess four antennas according to the base station 300 of second embodiment, wherein subscriber equipment 200-1,200-2,200-3 and 200-4 possess an antenna respectively, they by up link to information such as base station 300 feedback CQI and Rank.In view of subscriber equipment 200-1,200-2,200-3 and 200-4 have identical structure, be that example is described in detail with subscriber equipment 200-1 below.

Figure 16 shows the structured flowchart according to the base station of second embodiment of the invention, and Figure 17 shows the structured flowchart according to the subscriber equipment of second embodiment of the invention.

As shown in figure 16, the base station according to second embodiment of the invention comprises radio frequency unit 317, tachometric survey unit 310, direction of arrival measuring unit 318, division unit 311, order determining unit 312, MIMO mode determining unit 313, PMI estimation unit 314, MIMO mode and order notification unit 316 and resource allocation and data transmission unit 315.

As shown in figure 17, the subscriber equipment according to second embodiment of the invention comprise radio frequency unit 410, intercept unit 412, demodulating unit 413, data processing unit 414 and feedback information transmitting element 411.

Describe the specific operation process of above-mentioned each unit and annexation each other in detail below in conjunction with Figure 18 and Figure 19.Figure 19 is the flow chart of describing according to the detail operations process of the base station of the embodiment of the invention and subscriber equipment.

As shown in figure 19, in second embodiment of the invention, carry out the measurement of DOA and the estimation of PMI in base station side, and subscriber equipment is not to base station feedback PMI information.

4 * 4 antenna MU-MIMO systems adopt the MU-MIMO structure of LTE definition, as shown in figure 15.In the descending MU-MIMO of LTE system, adopt the mapping mode of fixed codeword, adopt the mapping relations of order, code word, layer among the MU-MIMO as shown in figure 18 to layer.Present embodiment adopts the mode of order 4 (Rank4), and subscriber equipment 200-1,200-2,200-3,200-4 can take the CW1 code word among Figure 18 simultaneously.

As shown in figure 19, at step S200, the tachometric survey unit 310 of base station 300 carries out the measurement of the movement velocity of each subscriber equipment, so that these subscriber equipmenies are divided into different classifications.

The movement velocity of all subscriber equipmenies of the 310 pairs of whole wireless areas in tachometric survey unit of base station 300 is measured, and according to measured movement velocity all subscriber equipmenies is divided into low speed user equipment, middling speed subscriber equipment, highspeed user's equipment.The measuring unit 310 of the speed of base station 300 is measured movement velocity can be based on up transmission symbol (UL RS), Random Access Channel (RACH), uplink detection channel (UL Sounding).

At step S201, division unit 311 is carried out the division of open loop MIMO and closed-loop MIMO based on the speed of measured subscriber equipment.

Division unit 311 is different according to low speed UE, middling speed UE and high speed UE kind, low speed UE is set adopts the closed-loop MIMO pattern, middling speed UE and high speed UE is set adopts the open loop MIMO pattern.

At step S202, direction of arrival measuring unit 318 is carried out the measurement of the direction of arrival of each subscriber equipment.

In the down link, the DOA of the subscriber equipment of 318 pairs of up links of direction of arrival measuring unit of base station measures.The measurement of DOA can be adopted existing MUSIC, ESPRIT, subspace method, maximum likelihood method scheduling algorithm.The DOA method of measurement that present embodiment adopts can be used for reference existing piecewise interpolation method based on signal strength signal intensity (referring to books " based on the 4th third-generation mobile communication technology of TDD " 375-380 page or leaf, Xie Xianzhong, Lee are full and clear etc. writes, publish in July, 2005, the Electronic Industry Press), promptly utilize and arrive signal strength signal intensity (SOA, strengthof arrival) and arriving signal difference value (SDOA, strength difference of arrival) estimate the wave beam angle of arrival (DOA).As shown in figure 21, in one 4 * 4 descending MU-MIMO system, there are 4 transmitting antennas base station 300, at regional P1, P2, P3,4 single antenna subscriber equipmenies are arranged among the P4, then 4 of the base station end antenna measurements signal strength signal intensity of going out these 4 subscriber equipmenies is respectively SOA_T1_P1, SOA_T2_P1, SOA_T3_P1, SOA_T4_P1, SOA_T1_P2, SOA_T2_P2, SOA_T3_P2, SOA_T4_P2, SOA_T1_P3, SOA_T2_P3, SOA_T3_P3, SOA_T4_P3, SOA_T1_P4, SOA_T2_P4, SOA_T3_P4, SOA_T4_P4, to first single antenna UE, can definition signal intensity difference score value be SDOA_T1_T2_P1, SDOA_T1_T3_P1, SDOA_T1_T4_P1, SDOA_T2_T3_P1, SDOA_T2_T4_P1, SDOA_T3_T4_P1, have 6 kinds of difference values, 4 UE then have difference value in 24 altogether.Set up the mapping table of the size and the DOA size of 24 kinds of difference values, then promptly can find out the DOA of each subscriber equipment to the up link of base station by tabling look-up, the PMI estimation unit 314 of base station estimates the PMI of down link again according to up DOA, by downlink signaling the PMI of down link is sent to subscriber equipment again.

As shown in figure 16, in the down link, the PMI estimation unit 314 of base station 300 estimates the PMI of base station to each subscriber equipment according to the DOA of each subscriber equipment.The base station is to the MIMO send mode of subscriber equipment in the 300 decision down links of base station.As shown in figure 21, base station 300 is decided to be 0 °-120 ° to the covering space of wireless area, think that the space is a vector quantization and equally distributed, be a DOA interval then every 7.5 °, there are DOA1～DOA16 totally 16 intervals in the space, defining 4 * 4 antenna MU-MIMO PMI of system grades again is 1～16 grade, and then the base station can estimate the value of PMI from DOA.

As mentioned above, the mapping relations of DOA and PMI are not linear, but in fact the mapping relations of DOA and PMI are that off-line generates, can be linearity one to one, also can be non-linear one to one non-, it be that the set of rule off-line generates and stores in BS and UE.

At step S203, the order determining unit 312 of base station is determined the mode of rank adaptation.

In the down link, the order determining unit 312 of base station determines whether down link adopts the adaptive mode of Rank to decide the value of order.In the present embodiment, at subscriber equipment 200-1,200-2,200-3 and 200-4, the mode of Rank4 is adopted in base station 300 decisions.As shown in figure 18, each subscriber equipment can take this code word of CW1 among Figure 18 simultaneously.

At step S204, MIMO mode determining unit 313 is carried out determining of MIMO mode.

In the down link, the base station is according to PMI and Rank decision MIMO mode.In the present embodiment, at each subscriber equipment, PMI and Rank decision MIMO mode that MIMO mode determining unit 313 estimates according to the DOA of subscriber equipment.

At step S205, MIMO mode and order notification unit 316 are to determined MIMO mode of notification of user equipment and order mode.

In the down link, the MIMO mode of base station 300 and order notification unit 316 send the UE of information such as MIMO pattern, MIMO send mode, movement velocity, PMI to wireless area by downlink signaling.The base station can send information such as above-mentioned MIMO pattern, MIMO send mode, movement velocity, PMI to UE by PDCCH or PDSCH or BCH.For saving link overhead, these information can the off-line configuration become abstract pattern, and the base station sends these abstract patterns to the frequency spectrum resource of UE with the saving down link by PDCCH or PDSCH.

At step S206,, intercept 312 pairs of MIMO modes in unit and order mode and intercept at the subscriber equipment end.In the down link, subscriber equipment intercept the downlink signaling that information such as the send mode that is loaded with MIMO pattern, MIMO that sends the base station, movement velocity, PMI are intercepted in unit 212.

At step S207, the feedback information transmitting element of subscriber equipment 411 sends feedback information by up link to the base station.

In the up link, MIMO pattern, MIMO send mode and the velocity information of subscriber equipment basis down link separately adopts feedback scheme separately, when needing feedback, then feedback information sent to BS.For low speed UE, give base station 300 as subscriber equipment 200-1,200-2 among Figure 15,200-3 and 200-4 feedback CQI, PMI, Rank, Resource Block call number information, constitute closed-loop MIMO system.For middling speed UE or high speed UE, as subscriber equipment 200-1,200-2,200-3 and the 200-4 among Figure 15, these subscriber equipment feedbacks CQI, Rank, Resource Block call number information are given base station 300, do not feed back PMI information and give base station 300.

At step S208, radio frequency unit 317 receiving feedback informations of base station and resource allocation and data transmission unit 315 carry out resource allocation based on the feedback information that receives and data send.

In the down link, the resource allocation of base station and data transmission unit 315 are carried out Radio Resource and are carried out scheduling of resource and distribution and send data to subscriber equipment according to the feedback information of subscriber equipment.

At step S209, subscriber equipment receives the signal that the base station sends by radio frequency unit 210, and demodulates the data of transmission by demodulating unit 213.In the down link, the data that the demodulating unit 413 of subscriber equipment is received according to information butt joint such as the send mode of self kind, MIMO pattern, MIMO, order, PMI are decoded.Then, 414 pairs of data of data processing unit are handled, so that present.

As mentioned above, be to save signaling consumption, second embodiment can adopt when BS measures up link the method for the DOA of down link being measured at UE, and promptly subscriber equipment estimates the PMI of up link to the DOA of subscriber equipment according to the base station.

As shown in figure 20, the modification according to the base station of second embodiment of the invention comprises radio frequency unit 317, tachometric survey unit 310, division unit 311, order determining unit 312, MIMO mode determining unit 313, MIMO mode and order notification unit 316 and resource allocation and data transmission unit 315.These unit are identical with the function of as shown in figure 16 corresponding units, are not described in detail here.

Show as Figure 20, according to the modification of the subscriber equipment of second embodiment of the invention comprise radio frequency unit 410, intercept unit 412, demodulating unit 413, data processing unit 414 and feedback information transmitting element 411, direction of arrival measuring unit 415 and PMI determining unit 416.As mentioned above, the descending DOA that carries out subscriber equipment self in user equipment side measures, and estimates corresponding PMI by mode same as described above, sends to the base station by feedback information transmitting element 411 then.

As seen, by in the two, carrying out aforesaid operations simultaneously, thereby removed from each other to the transmission of DOA information and PMI.

[the 3rd embodiment]

Figure 22 shows the schematic diagram according to 4 * 4 up link MU-MIMO systems of third embodiment of the invention.As shown in figure 22, have four antennas according to the base station 300 of the 3rd embodiment, subscriber equipment all possesses an antenna.In view of subscriber equipment 200-1,200-2,200-3 and 200-4 have identical structure, be that example is described in detail with subscriber equipment 200-1 below.

Figure 23 shows the structured flowchart according to the base station of third embodiment of the invention, and Figure 24 shows the structured flowchart according to the subscriber equipment of third embodiment of the invention.

As shown in figure 23, the base station according to third embodiment of the invention comprises radio frequency unit 517, order determining unit 512, MIMO mode determining unit 513, MIMO mode and order notification unit 516, resource allocation unit 515, demodulating unit 519, direction of arrival measuring unit 520, PMI estimation unit 521 and data processing unit 518.

As shown in figure 24, the subscriber equipment according to third embodiment of the invention comprise radio frequency unit 610, intercept unit 612, demodulating unit 613, data processing unit 614, feedback information transmitting element 611, tachometric survey unit 617, direction of arrival measuring unit 615, division unit 618 and PMI estimation unit 616.

Describe the specific operation process of above-mentioned each unit and annexation each other in detail below in conjunction with Figure 25 and Figure 26.Figure 26 is the flow chart of describing according to the detail operations process of the base station of third embodiment of the invention and subscriber equipment.

As shown in figure 22, in third embodiment of the invention, carry out the measurement of DOA and the estimation of PMI in base station and user equipment side respectively, subscriber equipment is not to base station feedback PMI information.

4 * 4 antenna MU-MIMO systems adopt the MU-MIMO structure of LTE definition, as shown in figure 22.In the up MU-MIMO of LTE system, adopt the mapping mode of fixed codeword, adopt the mapping relations of order, code word, layer among the MU-MIMO as shown in figure 18 to layer.Present embodiment adopts the mode of order 4 (Rank4), and each subscriber equipment can take the CW1 code word among Figure 18 simultaneously.

As shown in figure 26, at step S300, the tachometric survey unit 617 of subscriber equipment carries out the measurement of the movement velocity of subscriber equipment, self should belong to which classification by determining it.

Each subscriber equipment can be measured movement velocity separately, and according to measured movement velocity oneself being divided into low speed UE, middling speed UE, high speed UE.UE measures movement velocity can be based on descending reference symbol (DL RS), synchronizing channel (SCH) or other descending transmission symbol (DL RS).

At step S301, division unit 618 is carried out the division of open loop MIMO and closed-loop MIMO based on the speed of measured subscriber equipment.

Each subscriber equipment can be provided with low speed UE and adopt the closed-loop MIMO pattern according to the difference that belongs to low speed UE, middling speed UE or high speed UE kind separately, middling speed UE and high speed UE is set adopts the open loop MIMO pattern.After each UE sets up open loop MIMO pattern or closed-loop MIMO pattern, open loop MIMO pattern of self or closed-loop MIMO pattern are notified to the base station by up means of signaling.

At step S302, direction of arrival measuring unit 520 and direction of arrival measuring unit 615 are carried out the measurement of the direction of arrival of up link and down link.

For example, the DOA of 615 pairs of down links of direction of arrival measuring unit of subscriber equipment measures, and estimates the PMI of the UE of up link to BS by PMI estimation unit 616 according to the DOA of down link.The DOA of 520 pairs of up links of direction of arrival measuring unit of base station equipment measures, and estimates the PMI of the BS of down link to UE by PMI estimation unit 521 according to the DOA of up link.Describedly estimate PMI according to DOA and can adopt the method for tabling look-up to finish, the pairing PMI of DOA is stored in the database of BS and UE under off-line case.In other words, the method that adopts BS that the DOA of up link is measured, BS estimates the PMI of down link according to UE to the DOA of BS, the reciprocity of utilizing up channel and down channel on direction of arrival, to have, and it is the PMI of up link that UE is used as the PMI of down link.UE to the method for measurement of the DOA of down link as shown in figure 25, adopt the method for measurement of E-OTD, the method to realize the location on UE, calculates BS DOA to UE down link in the position relation by BS and UE by observed time difference, only needs to use computed in software.In order to move the E-OTD algorithm down in Idle pattern (subscriber equipment 200-1 does not handle calling) and dedicated mode (subscriber equipment 200-1 handles calling), user that it must has enough disposal abilities and memory capacity.The E-OTD localization method is a subscriber equipment according to base station in service sector 300 and the measurement data of 2 base station 300-1 and 300-2 on every side, calculates the time difference between them, and the time difference is used to calculate the position of subscriber equipment with respect to base station 300.The base quantity relevant with E-OTD has three: differ from observed time difference OTD, actual time RTD and geographical position time difference GTD.OTD is that the time of reception of observed two the diverse location base station signals of UE is poor.RTD is that two system times between the BS are poor; GTD is two transmission time differences that BS causes owing to range difference to UE.If d1 is the distance between base station 300 and the UE, d2 is the distance between base station 300-1 and the UE, and d3 is the distance between base station 300-2 and the UE, then

GTD1＝|d2-d1|/v (2)

GTD2＝|d3-d2|/v (3)

GTD3＝|d3-d1|/v (4)

V is the velocity of radio waves in the formula.Close between above-mentioned three amounts and be:

OTD1＝RTD1+GTD1 (5)

OTD2＝RTD2+GTD2 (6)

OTD3＝RTD3+GTD3 (7)

As base station 300,300-1 and 300-2 each other all synchronously the time, then RTD1=0, RTD2=0, RTD3=0.In the E-OTD method, obtain correct result, number of base stations is at least three, is positioned at different geographical position, and important one is base station synchronization.The most frequently used method of synchronising base station is that the base station installs and fixes the GPS receiver.Like this, just can obtain the geographical position and the coordinate of subscriber equipment exactly,, just can be easy to calculate the DOA that the down link of subscriber equipment 200-1 is arrived in base station 300 according to the described principle of Figure 11.

At step S303, the order determining unit 512 of base station is determined the mode of rank adaptation.

In the up link, whether the order determining unit 512 decision up links of base station adopt the adaptive mode of Rank to decide the value of order.In the present embodiment, at each subscriber equipment, the mode of Rank4 is adopted in order determining unit 512 decisions of base station 300.As shown in figure 22, each subscriber equipment can take a code word among Figure 18 simultaneously respectively.

At step S304, MIMO mode determining unit 513 is carried out determining of MIMO mode.

In the up link, the base station is according to PMI and Rank decision MIMO mode.In the present embodiment, at each subscriber equipment, the PMI that base station 300 estimates according to the DOA of each subscriber equipment and the MIMO mode of Rank decision up link.

At step S305, MIMO mode and order notification unit 516 are to determined MIMO mode of notification of user equipment and order mode.

The base station sends the subscriber equipment of MIMO send mode information to wireless area by downlink signaling.The base station can send above-mentioned MIMO send mode, order information to subscriber equipment by PDCCH or PDSCH or BCH.

At step S306, the unit 612 of intercepting of subscriber equipment carries out intercepting of MIMO mode and order mode.In other words, the send mode that is loaded with MIMO that BS sends, the downlink signaling of order information are intercepted in the unit 612 of intercepting of subscriber equipment.

At step S307, in the down link, the base station when needing feedback, then sends to subscriber equipment to feedback information according to MIMO pattern, MIMO send mode and the order information employing feedback scheme separately of the up link of each subscriber equipment.

At step S308, the resource allocation unit 515 of base station carries out scheduling of resource and distribution to each subscriber equipment, and schedule information is notified to each subscriber equipment by the mode by downlink signaling.

At step S309, the data that the feedback information of user equipment side and data transmission unit 611 will send send to the base station on the resource of distributing.

MIMO send mode, order, the schedule information of the up link that the feedback signal of this subscriber equipment and data transmission unit 611 are sent according to the base station send data to the base station.

At step S310, the base station demodulating unit 519 carry out data demodulates and carry out data processing so that present by data processing unit 518.

The data that the demodulating unit 519 of base station is received according to information butt joint such as the send mode of the MIMO pattern of up link, MIMO, order, PMI are decoded, and carry out data processing so that present the content of data by data processing unit 518 then.

More than be explanation, go for the mimo system that diversity mode such as Single User MIMO system, multi-user MIMO system, beamforming system, precoding MIMO system, open loop MIMO mode and CDD (zero CDD, little CDD, big CDD), SFBC, FSTD or multiplex mode make up at up link MIMO transmission means.

As mentioned above, the embodiment of the invention is divided into low speed, middling speed, highspeed user to subscriber equipment according to the movement velocity of subscriber equipment; Low speed user equipment is set adopts closed-loop MIMO pattern, middling speed and highspeed user's equipment to adopt the open loop MIMO pattern; DOA to subscriber equipment measures again, and estimates the PMI of subscriber equipment according to the DOA that measures; Then, the order mode of decision mimo system; The PMI that obtains according to the sum of ranks direction of arrival determines the MIMO send mode; Notify receiving terminal MIMO mode, order mode again; Receiving terminal is finished MIMO mode, order mode is intercepted; At last, receiving terminal feeds back according to the information that listens to.The present invention is directed to middling speed and highspeed user's equipment, proposed open loop MIMO system and device, have simplicity of design, characteristics that overall performance is good based on DOA.Therefore, the present invention proposes in the wireless communication system open loop MIMO technology based on DOA, can comprise third generation cellular mobile network (3G) for various wireless or mobile networks, super three generations's cellular mobile network (S3G, B3G), the 4th generation cellular mobile network (4G), single-frequency radio network (SFN), wireless lan (wlan), wireless wide area network (WWAN), multimedia broadcast-multicast service net (MBMS), self-organization network (Mesh, Ad Hoc, Censor Network), the open loop MIMO technology of digital home network networks such as (e-Home) provides important theory foundation and concrete implementation method.

So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.

Claims (43)

1, a kind of open loop MIMO method based on direction of arrival at down link, comprises step:

Movement velocity to subscriber equipment is measured, and according to measured movement velocity described subscriber equipment is divided into the first kind or second class, and wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment;

For first kind subscriber equipment is provided with the closed-loop MIMO pattern, and be that the second class subscriber equipment is provided with the open loop MIMO pattern;

The base station is measured the direction of arrival of up link, and estimates the pre-coding matrix index number of down link according to the direction of arrival of up link;

Base station decision down link adopts the mode of which kind of rank adaptation to carry out the decision of order;

The base station determines MIMO send mode in the down link according to the pre-coding matrix index number and the order of down link;

The base station sends MIMO pattern, MIMO send mode, order, pre-coding matrix index number to subscriber equipment by downlink signaling;

Subscriber equipment is intercepted send mode, the order of the MIMO pattern that is loaded with down link sent the base station, MIMO, the downlink signaling of pre-coding matrix index number;

MIMO pattern, MIMO send mode and the order of subscriber equipment basis down link separately adopts feedback scheme separately, when needing feedback, then according to described feedback scheme feedback information sent to the base station;

Wireless resource scheduling and distribution are carried out according to the feedback information of subscriber equipment in the base station, and send data to described subscriber equipment;

Subscriber equipment carries out demodulation according to self classification, MIMO pattern, the send mode of MIMO, order, pre-coding matrix index number to the data that receive.

2, method according to claim 1, the mode of wherein said rank adaptation comprise rank adaptation mode based on feedback channel, based on instantaneous rank adaptation mode, based on the rank adaptation mode in geographical position, based on the rank adaptation mode of statistics Signal to Interference plus Noise Ratio.

3, method according to claim 1, wherein, each subscriber equipment is measured movement velocity separately, and according to measured movement velocity oneself being divided into the first kind or second class.

4, method according to claim 3, wherein each subscriber equipment comes for open loop MIMO or closed-loop MIMO are set oneself according to the classification that belongs to separately.

5, method according to claim 4, wherein each subscriber equipment will send to the base station by up signaling for the MIMO pattern that oneself is provided with.

6, method according to claim 1, the wherein said pre-coding matrix index number that estimates according to direction of arrival are to adopt the method for tabling look-up to finish.

7, method according to claim 6, wherein the pairing pre-coding matrix index number of the data of direction of arrival is stored in the database of base station and/or subscriber equipment under off-line case.

8, method according to claim 1, wherein subscriber equipment is given the base station according to the different information of the send mode feedback of separately MIMO pattern, MIMO, is provided with subscriber equipment based on the open loop MIMO mode of direction of arrival and need not to feed back the precoding call number and give the base station.

9, method according to claim 1, wherein said method is applicable to the Single User MIMO system, multi-user MIMO system, beamforming system, the precoding MIMO system, open loop MIMO mode and cyclic delay diversity, empty at least two kinds of mimo systems that make up of block code, frequency switched transmit diversity frequently.

10, a kind of open loop MIMO method based on direction of arrival at down link, comprises step:

Movement velocity to subscriber equipment is measured, and according to measured movement velocity described subscriber equipment is divided into the first kind and second class, and wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment;

For first kind subscriber equipment is provided with the closed-loop MIMO pattern, and be that the second class subscriber equipment is provided with the open loop MIMO pattern;

Base station and subscriber equipment are measured the direction of arrival of up link and down link respectively, and estimate the pre-coding matrix index number of down link and up link respectively according to the direction of arrival of up link and down link;

The base station decision adopts the mode of which kind of rank adaptation to carry out the decision of order;

The base station determines MIMO send mode in the down link according to the pre-coding matrix index number and the order of down link;

The base station sends MIMO pattern in order, the down link, MIMO send mode to subscriber equipment by downlink signaling;

Subscriber equipment is intercepted the downlink signaling that is loaded with MIMO pattern in order, the down link, MIMO send mode that send the base station;

Subscriber equipment basis MIMO pattern, MIMO send mode and order separately adopts feedback scheme separately, when needing feedback, then according to described feedback scheme feedback information sent to the base station;

Wireless resource scheduling and distribution are carried out according to the feedback information of subscriber equipment in the base station, and send data to described subscriber equipment;

Subscriber equipment carries out demodulation according to self classification, MIMO pattern, the send mode of MIMO, order, pre-coding matrix index number to the data that receive.

11, method according to claim 10, the mode of wherein said rank adaptation comprise rank adaptation mode based on feedback channel, based on instantaneous rank adaptation mode, based on the rank adaptation mode in geographical position, based on the rank adaptation mode of statistics Signal to Interference plus Noise Ratio.

12, method according to claim 10, wherein each subscriber equipment is measured movement velocity separately, and according to measured movement velocity oneself being divided into the first kind or second class.

13, method according to claim 12, wherein each subscriber equipment comes for open loop MIMO or closed-loop MIMO are set oneself according to the classification that belongs to separately.

14, method according to claim 13, wherein each user will send to the base station by up signaling for the MIMO pattern that oneself is provided with.

15, method according to claim 10, the wherein said pre-coding matrix index number that estimates according to direction of arrival are to adopt the method for tabling look-up to finish.

16, method according to claim 15, wherein the pairing pre-coding matrix index number of the data of direction of arrival is stored in the database of base station and/or subscriber equipment under off-line case.

17, method according to claim 10, wherein base station and subscriber equipment utilize the reciprocity that up link and down link have on direction of arrival, the estimated accuracy of control pre-coding matrix index number.

18, method according to claim 10, wherein said method is applicable to the Single User MIMO system, multi-user MIMO system, beamforming system, the precoding MIMO system, open loop MIMO mode and cyclic delay diversity, empty at least two kinds of mimo systems that make up of block code, frequency switched transmit diversity frequently.

19, in a kind of wireless communication system based on the open loop MIMO method of direction of arrival, at up link, comprise step:

Movement velocity to subscriber equipment is measured, and according to measured movement velocity described subscriber equipment is divided into the first kind and second class, and wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment;

For first kind subscriber equipment is provided with the closed-loop MIMO pattern, and be that the second class subscriber equipment is provided with the open loop MIMO pattern;

The base station is measured the direction of arrival of up link and down link, and estimates the pre-coding matrix index number of down link and up link respectively according to the direction of arrival of up link and down link;

Base station decision up link adopts the mode of which kind of rank adaptation to carry out the decision of order;

The pre-coding matrix index number of the down link that the base station basis obtains, and consider that MIMO pattern, order are with MIMO send mode in the decision up link;

The base station sends the MIMO pattern, MIMO send mode, order of up link to subscriber equipment by downlink signaling;

Subscriber equipment is intercepted the MIMO pattern of sending the base station that is loaded with up link, the send mode of MIMO, the downlink signaling of order;

Feedback scheme is adopted according to MIMO pattern, the MIMO send mode of the up link of described subscriber equipment in the base station, when needing feedback, then according to described feedback scheme feedback information is sent to described subscriber equipment;

Scheduling of resource is carried out to described subscriber equipment in the base station, and the mode of schedule information by downlink signaling is notified to described subscriber equipment;

MIMO pattern, MIMO mode, order, the schedule information of the up link that subscriber equipment sends according to the base station send data to the base station;

The data that receive according to information butt joint such as the send mode of described subscriber equipment MIMO pattern, MIMO, order, pre-coding matrix index numbers the base station are carried out demodulation.

20, method according to claim 19, the mode of wherein said rank adaptation comprise rank adaptation mode based on feedback channel, based on instantaneous rank adaptation mode, based on the rank adaptation mode in geographical position, based on the rank adaptation mode of statistics Signal to Interference plus Noise Ratio.

21, method according to claim 19, wherein, each subscriber equipment is measured movement velocity separately, and according to measured movement velocity oneself being divided into the first kind or second class.

22, method according to claim 21, wherein each subscriber equipment comes for open loop MIMO or closed-loop MIMO are set oneself according to the classification that belongs to separately.

23, method according to claim 22, wherein each user will send to the base station by up signaling for the MIMO pattern that oneself is provided with.

24, method according to claim 19, the wherein said pre-coding matrix index number that estimates according to direction of arrival are to adopt the method for tabling look-up to finish.

25, method according to claim 24, wherein the pairing pre-coding matrix index number of the data of direction of arrival is stored in the database of base station and/or subscriber equipment under off-line case.

26, method according to claim 19, wherein subscriber equipment is given the base station according to the different information of the send mode feedback of separately MIMO pattern, MIMO, is provided with subscriber equipment based on the open loop MIMO mode of direction of arrival and need not to feed back the precoding call number and give the base station.

27, method according to claim 19, wherein base station and subscriber equipment utilize the reciprocity that up link and down link have on direction of arrival, the estimated accuracy of control pre-coding matrix index number.

28, method according to claim 19, wherein said method is applicable to the Single User MIMO system, multi-user MIMO system, beamforming system, the precoding MIMO system, open loop MIMO mode and cyclic delay diversity, empty at least two kinds of mimo systems that make up of block code, frequency switched transmit diversity frequently.

29, a kind of base station comprises:

The tachometric survey unit is used to measure the movement velocity of at least one subscriber equipment, and described subscriber equipment is divided into the first kind and second class, and wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment;

Division unit is used for movement velocity according to this subscriber equipment and is defined as it open loop MIMO or closed-loop MIMO are set;

The direction of arrival measuring unit is used to measure the direction of arrival of up link;

The pre-coding matrix index number estimation unit is used for the pre-coding matrix index number based on the direction of arrival estimating down-ward link of this up link;

The order determining unit; Be used for determining the adaptive mode of order; And

MIMO mode determining unit is used for determining the MIMO mode according to the adaptive mode and the pre-coding matrix index number of determined order.

30, base station as claimed in claim 29 also comprises MIMO mode and order notification unit, by the adaptive mode of downlink signaling to determined MIMO mode of notification of user equipment and order.

31, base station as claimed in claim 29, the mode of wherein said rank adaptation comprise following one of at least:

Based on the rank adaptation mode of feedback channel, based on instantaneous rank adaptation mode, based on the rank adaptation mode in geographical position, based on the rank adaptation mode of adding up Signal to Interference plus Noise Ratio.

32, base station as claimed in claim 29, wherein said pre-coding matrix index number estimation unit adopt the mode of tabling look-up to estimate pre-coding matrix index number according to direction of arrival.

33, base station as claimed in claim 30, wherein said MIMO mode and order notification unit send MIMO pattern, MIMO send mode, order, pre-coding matrix index number to subscriber equipment by downlink signaling.

34, a kind of subscriber equipment comprises:

Intercept the unit, intercept send mode, the order of the MIMO pattern that is loaded with down link sent the base station, MIMO, the downlink signaling of pre-coding matrix index number; And

Demodulating unit carries out demodulation according to self kind, MIMO pattern, the send mode of MIMO, order, pre-coding matrix index number to the data that receive.

35, subscriber equipment as claimed in claim 34, also comprise: the feedback information transmitting element, the MIMO pattern, MIMO send mode and the order that are used for according to down link are determined feedback feedback scheme, and when needs feed back, according to described feedback scheme feedback information are sent to the base station.

36, a kind of subscriber equipment comprises:

The direction of arrival measuring unit is used to measure the direction of arrival of down link;

The pre-coding matrix index number estimation unit is used for the pre-coding matrix index number based on the direction of arrival estimating uplink of down link, as the pre-coding matrix index number of down link;

Intercept the unit, intercept the MIMO pattern of sending the base station that is loaded with down link, the send mode of MIMO and the downlink signaling of order; And

Demodulating unit carries out demodulation according to self send mode, order, the pre-coding matrix index number of down link of kind, MIMO pattern, MIMO to the data that receive.

37, subscriber equipment as claimed in claim 36, wherein said pre-coding matrix index number estimation unit adopt the mode of tabling look-up to estimate pre-coding matrix index number according to direction of arrival.

38, subscriber equipment as claimed in claim 36, also comprise: the feedback information transmitting element, the MIMO pattern, MIMO send mode and the order that are used for according to down link are determined feedback scheme, and when needs feed back, according to described feedback scheme feedback information are sent to the base station.

39, a kind of base station comprises:

The direction of arrival measuring unit is used to measure the direction of arrival of up link;

The pre-coding matrix index number estimation unit is used for the direction of arrival estimating down-ward link pre-coding matrix index number based on this up link, as the pre-coding matrix index number of up link;

Receiving element receives the message from its described classification of expression of subscriber equipment;

The order determining unit; Be used for determining the adaptive mode of order; And

MIMO mode determining unit is used for determining the MIMO mode according to the pre-coding matrix index number of determined sum of ranks up link.

40, base station as claimed in claim 39 also comprises MIMO mode and order notification unit, by downlink signaling to determined MIMO mode of notification of user equipment and order.

41, base station as claimed in claim 39, the mode of wherein said rank adaptation comprise following one of at least:

Based on the rank adaptation mode of feedback channel, based on instantaneous rank adaptation mode, based on the rank adaptation mode in geographical position, based on the rank adaptation mode of adding up Signal to Interference plus Noise Ratio.

42, a kind of subscriber equipment comprises:

The tachometric survey unit is used to measure the movement velocity of at least one subscriber equipment, and described subscriber equipment is divided into the first kind and second class, and wherein the speed of first kind subscriber equipment is lower than the speed of the second class subscriber equipment;

Division unit is used for movement velocity according to this subscriber equipment and is defined as it open loop MIMO or closed-loop MIMO are set;

The direction of arrival measuring unit is used to measure the direction of arrival of down link;

The pre-coding matrix index number estimation unit is used for the pre-coding matrix index number based on the direction of arrival estimating uplink of this down link;

The feedback information transmitting element sends to the base station with the information of representing described classification.

43, subscriber equipment as claimed in claim 42, the mode of wherein said rank adaptation comprise following one of at least:

Based on the rank adaptation mode of feedback channel, based on instantaneous rank adaptation mode, based on the rank adaptation mode in geographical position, based on the rank adaptation mode of adding up Signal to Interference plus Noise Ratio.

Images