CN101272167A - Multi-input multi-output system and method of TD-SCDMA system outdoor macro honeycomb - Google Patents

Abstract

The invention relates to an outdoor macro cell multi-input multi-output system for time-division synchronous code-division multi-access system, which comprises a user terminal and a base station. The user terminal is provided with two antennae which are independently weakened, and all array elements of the base station split in two antenna subarrays. The two antenna subarrays wirelessly communicate with two antennae of the user terminal in the mode of multi-input multi-output of the adaptive mixing space diversity and multiplexing. The invention also discloses a multi-input multi-output method applied to the system. The method is adaptively mixed with the multi-input multi-output space diversity mode and space multiplexing mode, and includes the evaluation and judgment as well as adaptive switching of two modes, thus converging the advantages of the existing two modes and avoiding the defects when the two modes are separately applied to the TD-SCDMA system, so as to significantly improve the traffic carrying capacity.

Description

The multi-input multi-output system of TDS-CDMA system outdoor macro honeycomb and method

Technical field

The present invention relates to TD SDMA (TD-SCDMA) system, relate in particular to the system and method for in the TD-SCDMA system outdoor macrocell that adopts smart antenna, using multiple-input and multiple-output (MIMO) technology.

Background technology

The MIMO technology is the popular research field of moving communicating field in recent years, and it is characterised in that transmitting set and receiver all introduced many antennas.With respect to the traditional single output of single input (SISO) system, mimo system obtains the very big lifting of power system capacity by space diversity reception to communicate or space multiplexing technique.Many single outputs of input (MISO) and the list many outputs of input (SIMO) are two kinds of special shapes of MIMO, and promptly only at many antennas of end employing of communication link, the other end still adopts single antenna.

The base-station node (Node B) of existing TD-SCDMA system outdoor macrocell generally adopts smart antenna, and user terminal (UE) generally adopts single antenna.Therefore, the communication link in Node B and the sub-district between UE, up is the SIMO mode, descending then is the MISO mode.Because the TD-SCDMA system adopts the mode of identical networking, therefore no matter be up or descending, the interference that comes from adjacent sub-district is all very strong, although the smart antenna of Node B side carries out beam shaping in provisional capital up and down, can curb quite a few and disturb, but when whole net load is very heavy or the direction of arrival of this community user and adjacent area interference have still much more approaching the time that stronger residual interference can not be suppressed by smart antenna.Therefore, the TD-SCDMA system mode that generally adopted multi-plot joint to detect further suppresses those strong jammings that can't be suppressed by beam shaping.

Because many antennas of Node B side receiver provide the extra spatial domain degree of freedom, therefore the up multi-plot joint of Node B side detects linear system equation and can include more adjacent area interference (substantially exceeding the restriction of code channel number) in, thereby interference is suppressed.But the UE side has only an antenna, and it has only the degree of freedom in CDMA sign indicating number territory, and under the situation that this cell signal code channel has almost taken, its linear multi-plot joint detects does not often have enough degrees of freedom to include more adjacent sub-district strong jamming in.The adjacent sub-district strong jamming that those can not be included into, or directly treat as noise, signal to noise ratio reduced; Carry out non-linear interference eliminated mode reluctantly, can cause bigger snr loss equally based on the grouping iteration.

For other 3G (Third Generation) Moblie (3G) systems that adopt the CDMA mode, the spreading rate of TD-SCDMA system is lower, so the multi-path resolved rate of receiver is relatively poor, and the rake gain is remarkable not as other 3G systems.Node B side is owing to adopted many antennas, although be array antenna, the distance of part array element (for example two ends of linear array) still has several wavelength, and therefore some antenna diversity gains can be provided, but the reception of the single antenna of UE side does not have such gain source.

Introduce the problem that the MIMO technology not only can overcome above-mentioned UE single antenna receiver at existing TD-SCDMA system outdoor macrocell, improve down-link performance, but also can utilize space diversity or spatial multiplexing mode to promote the up-downgoing throughput greatly.The TD-SCDMA system is as a kind of 3G system of smooth evolution backward that supports, the pursuit that improves for the data service throughput is to exist forever.

But, the dual mode (space diversity mode, spatial multiplexing mode) of existing MIMO technology is not perfect solution, is applied in separately then to possess following pluses and minuses in the TD-SCDMA system outdoor macrocell environment separately:

1.TD-SCDMA the advantage of outdoor macro honeycomb using MIMO space diversity mode is:

A) disturb stronger zone and descending multi-plot joint detection technique to carry out applied in any combination in adjacent areas such as cell edges and can suppress descending interference greatly;

B) owing to the UE transmit diversity, it is well-to-do that therefore up multi-plot joint detects the strongly disturbing degree of freedom in the adjacent sub-district of inhibition, and uplink performance is better;

C) performance gain is more sane, the problem of the degree of freedom deficiency that causes at strong LOS environment can not occur under the spatial multiplexing mode.

2.TD-SCDMA the shortcoming of outdoor macro honeycomb using MIMO space diversity mode is: disturb not seriously in some adjacent areas, capacity is not as the MIMO spatial multiplexing mode under the good again scene of channel independence.

3.TD-SCDMA the advantage of outdoor macro honeycomb using MIMO spatial multiplexing mode is: disturb in some adjacent areas that capacity promotes very big under the good again scene of not serious (for example down link of inside, sub-district), channel independence.

4.TD-SCDMA the shortcoming of outdoor macro honeycomb using MIMO spatial multiplexing mode is:

A) the UE side increase the degree of freedom that a stand-alone antenna brings expand be used to fully recover many one the tunnel independently the spatial domain send data, it is identical with existing single antenna scheme that descending multi-plot joint detects the ratio that can suppress adjacent area interference, therefore antijamming capability is relatively poor, this can cause the user C/I of cell edge to descend to some extent, and then causes the decline of downlink capacity;

B) at strong LOS environment (angle spread is very little and nothing weak), the limited situation of the degree of freedom can appear in the Data Detection of descending UE side, causes Node B must close the emission of certain submatrix, and this is a very big loss for power system capacity.

Summary of the invention

Technical problem to be solved by this invention provides a kind of system and method for the TD-SCDMA system outdoor macrocell using MIMO technique based on array antenna submatrix division and ADAPTIVE MIXED space collection multiplexing technology, thereby increases substantially the business throughput of TD-SCDMA system outdoor macrocell environment up-downgoing.

The main contents of technical solution of the present invention are as follows:

A kind of multi-input multi-output system of TDS-CDMA system outdoor macro honeycomb comprises user terminal and base station, and described user terminal has two antennas that independence is weak; All array elements of described base station split into two antenna submatrixs, and all array elements in each antenna submatrix adopt same basic Midamble sign indicating number; The different antennae submatrix of the different antennae of described user terminal and described base station is all distributed different basic Midamble sign indicating numbers, or all distributes the difference skew of same basic Midamble sign indicating number; Two antennas of two antenna submatrixs of described base station and described user terminal carry out radio communication in the multiple-input and multiple-output mode of ADAPTIVE MIXED space collection multiplexing.

A kind of multiple-input multiple-output method of TDS-CDMA system outdoor macro honeycomb is applied in the aforesaid system, may further comprise the steps:

(1). the channel estimating of up each array element is carried out in the base station;

(2). the base station if correlation is not less than default thresholding, then switches to the space diversity mode with its uplink downlink, otherwise enters step (3) by the described uplink channel estimation channel relevancy between two antenna submatrixs of real-time assessment as a result;

(3). the base station is further assessed the degree of freedom situation that up multi-plot joint detects by described uplink channel estimation result; User terminal carries out down channel to be estimated, and further the degree of freedom situation that descending multi-plot joint detects is assessed according to described down channel estimated result, and described assessment result is fed back to the base station;

(4). the base station judges whether spatial multiplexing mode can provide the abundant degree of freedom to carry out up adjacent sub-district strong jamming and suppress, and if not, then uply switches to the space diversity mode, if then up assessment enters step (6); The base station also judges according to the described assessment result of user terminal feedback in the step (3) whether spatial multiplexing mode can provide the abundant degree of freedom to carry out the strong jamming of descending adjacent sub-district and suppress, if not, then descendingly switch to the space diversity mode, if then descending assessment enters step (5);

(5). user terminal carries out the received signal power measurement of base station transmit antennas submatrix to the user terminal reception antenna, and the measurement of two user terminal reception antenna interference powers, and gives the base station with above-mentioned measurement feedback;

(6). the base station is according to the channel estimation results of up base station reception antenna array element respective user terminal transmitting antenna, and the interference measurement results of each reception antenna array element of base station, respectively the customer service throughput rate under upstream space diversity mode and the upstream space multiplex mode is carried out real-time assessment, and up link is switched to the higher mode of throughput rate assessed value;

Real-time assessment is also carried out to the customer service throughput rate under descending space diversity mode and the descending spatial multiplexing mode respectively according to the described measurement result of user terminal feedback in the step (5) in the base station, and down link is switched to the higher mode of throughput rate assessed value.

Adopt the mimo system and the method for the TD-SCDMA system outdoor macrocell based on array antenna submatrix division and ADAPTIVE MIXED space collection multiplexing technology of the present invention, overcome existing TD-SCDMA system descending and do not had spatial domain diversity gain and the limited deficiency of descending multi-plot joint detection degree of freedom possibility, merged the advantage of existing MIMO space diversity mode and spatial multiplexing mode to greatest extent, the shortcoming that has faced when having avoided both in the TD-SCDMA system, to use separately simultaneously, minimum with system and hardware structure (especially at network side) is changed cost, has exchanged significant capacity for and has improved.

Description of drawings

Fig. 1 is the antenna schematic diagram (containing the submatrix split graph) of TD-SCDMA outdoor macro honeycomb mimo system of the present invention;

Fig. 2 is the switch decision flow chart of adaptive MIMO space diversity mode of the present invention and spatial multiplexing mode.

Embodiment

Provide specific embodiments of the invention below in conjunction with accompanying drawing.

As shown in Figure 1, increase a stand-alone antenna, form independent weak double antenna in the UE side.It is constant that Node B side is kept existing smart antenna framework, but all array elements are divided into two groups, forms two submatrixs; The basic principle of submatrix division is, belongs to the average distance maximum between two array elements of different submatrixs.The submatrix of the 8 antenna even linear arrays that generally adopt with existing TD-SCDMA macrocell base stations is split into example, 4 array elements in the left side are split into a submatrix, and 4 array elements in the right are split into another submatrix (annotate: if follow-up do not add explanation and all give tacit consent to Node B and adopt 8 antenna even linear arrays).Two submatrixs of Node B side and two antennas of UE side form 2 * 2MIMO mode of broad sense, and wherein arbitrary sublink all is the mode of 4 * 1 (descending) or 1 * 4 (up).UE side different antennae is distributed the difference skew (perhaps distributing different basic Midamble sign indicating numbers) of same basic Midamble sign indicating number; Similarly, Node B side different antennae submatrix is distributed the difference skew (perhaps distributing different basic Midamble sign indicating numbers) of same basic Midamble sign indicating number, and all array elements in the same submatrix adopt the same skew of same basic Midamble sign indicating number.

Node B carries out the switching of MIMO space diversity mode and spatial multiplexing mode adaptively according to following criterion:

1.Node B carries out the channel estimating of up each array element of this sub-district and adjacent sub-district, assess the channel relevancy of two submatrixs in real time by the channel estimation results of up each array element, the correlation height then switches to the space diversity mode, and correlation is hanged down and carried out the assessment of follow-up criterion;

2.Node B and UE obtain the quantity and the intensity of the adjacent sub-district high reject signal of up-downgoing respectively by the adjacent cell channel estimation of self, and then the degree of freedom situation that the up-downgoing multi-plot joint detects is assessed.Suppress if spatial multiplexing mode can not provide the abundant degree of freedom to carry out up adjacent sub-district strong jamming, then uply switch to the space diversity mode, otherwise the up assessment of carrying out follow-up criterion; Descendingly also carry out switch decision according to the same manner, the multi-plot joint of UE side that different is detects degree of freedom assessment result and finally feeds back to Node B, does decision-making by Node B;

3.Node B is according to the channel estimation results of up 2 transmitting antennas of 8 reception antenna corresponding UE (8 * 2), and in conjunction with the interference measurement results of each reception antenna, respectively the customer service throughput rate under upstream space diversity mode and the upstream space multiplex mode is carried out real-time assessment, and up link is switched to the higher mode of throughput rate assessed value;

4.UE signal power measurements with descending corresponding Node B2 the emission submatrixs of 2 reception antennas (2 * 2), interference power measurement result together with two reception antennas feeds back to Node B with certain form, Node B carries out real-time assessment to the customer service throughput rate under descending space diversity mode and the descending spatial multiplexing mode respectively, and down link is switched to the higher mode of throughput rate assessed value.

For the upstream space diversity mode, the UE side adopts double-antenna transmit diversity, and UE can simply adopt the channel estimation results of P-CCPCH to generate the antenna weights of transmit diversity according to the maximal received power criterion; Node B side adopts 8 aerial arrays to receive, Node B receiver merges (becoming 8 * 1 by 8 * 2) with the channel estimation results of corresponding UE two transmitting antennas on all reception antennas, adopts then with the consistent processing mode (for example multi-plot joint detection) of existing TD-SCDMA system's macrocellular uplink receiver and carries out the upstream data recovery.

For descending space diversity mode, Node B side adopts 8 aerial array down beam shapings, and the factor that needs to consider the two aerial signal high specifics merging of UE dual-antenna diversity reception back is carried out the optimization of figuration criterion, and for example the maximum receiving signal power guidelines will guarantee UE two antenna receiving signal power sum maximums; The UE side adopts dual-antenna diversity to receive, the UE receiver at first merges (becoming 2 * 1 by 2 * 2) with the channel estimation results of corresponding Node B two emission submatrixs on all reception antennas, the multi-plot joint that carries out double antenna then detects (the high specific merging process that wherein comprises two reception antennas), recovers downlink data.

For the upstream space multiplex mode, every antenna emission of UE different pieces of information, antenna rate controlled (PARC) mode of pursuing that the modulation of every antenna and coded system (MCS) adopt similar 3GPP TR25.867 technical documentation to mention is determined; Node B receiver is included the data of UE different transmit antennas in 8 antenna combined detection system equations, and the detection of unified each independent signal of carrying out separates.

For descending spatial multiplexing mode, different data are penetrated in two sub-paroxysms of Node B, and the MCS of each submatrix adopts and is similar to determining by the submatrix method of rate control by the antenna method of rate control; Two submatrixs are carried out the downlink wave beam excipient respectively independently, and the beam shaping of arbitrary submatrix will consider that all its signal merges factor at the high specific of UE side diversity double antenna; The UE receiver is included the data of the different emission of Node B submatrix in double antenna combined detection system equation, and the detection of unified each independent signal of carrying out separates.

Notice that the foregoing invention content can expand to UE stand-alone antenna number fully similarly greater than 2 situation (such as 4 vehicle-mounted antennas), this moment, the number of antenna submatrix was also consistent with the number of UE stand-alone antenna.

Be that example is specifically introduced the execution mode that the several committed steps in the foregoing invention content may adopt with descending high speed business below, but thought of the present invention is not confined on these details execution modes, any employing thought of the present invention but adopt other equivalent details execution modes should be considered yet and adopted the present invention program.

A kind of assessment mode example of the channel relevancy between the Node B antenna submatrix

If

Be up i user after Node B ka root reception antenna channel estimating and through the channel impulse response sequence of thresholding reprocessing (annotating: contain corresponding two transmitting antennas independently of two Midamble skew windows at least), the channel impulse response of these user's 8 antennas can be write as matrix so

Therefore, this user's signal space correlation matrix is:

$R_i={H_i}^H\·H_i=\left[\begin{array}{cccccccc}{r}_{\mathrm{1,1}}& r_{\mathrm{1,2}}& r_{\mathrm{1,3}}& r_{\mathrm{1,4}}& r_{\mathrm{1,5}}& r_{\mathrm{1,6}}& r_{\mathrm{1,7}}& r_{\mathrm{1,8}}\\ r_{\mathrm{2,1}}& r_{\mathrm{2,2}}& r_{\mathrm{2,3}}& r_{\mathrm{2,4}}& r_{\mathrm{2,5}}& r_{\mathrm{2,6}}& r_{\mathrm{2,7}}& r_{\mathrm{2,8}}\\ r_{\mathrm{3,1}}& r_{\mathrm{3,2}}& r_{\mathrm{3,3}}& r_{\mathrm{3,4}}& r_{\mathrm{3,5}}& r_{\mathrm{3,6}}& r_{\mathrm{3,7}}& r_{\mathrm{3,8}}\\ r_{\mathrm{4,1}}& r_{\mathrm{4,2}}& r_{\mathrm{4,3}}& r_{\mathrm{4,4}}& r_{\mathrm{4,5}}& r_{\mathrm{4,6}}& r_{\mathrm{4,7}}& r_{\mathrm{4,8}}\\ r_{\mathrm{5,1}}& r_{\mathrm{5,2}}& r_{\mathrm{5,3}}& r_{\mathrm{5,4}}& r_{\mathrm{5,5}}& r_{\mathrm{5,6}}& r_{\mathrm{5,7}}& r_{\mathrm{5,8}}\\ r_{\mathrm{6,1}}& r_{\mathrm{6,2}}& r_{\mathrm{6,3}}& r_{\mathrm{6,4}}& r_{\mathrm{6,5}}& r_{\mathrm{6,6}}& r_{\mathrm{6,7}}& r_{\mathrm{6,8}}\\ r_{\mathrm{7,1}}& r_{\mathrm{7,2}}& r_{\mathrm{7,3}}& r_{\mathrm{7,4}}& r_{\mathrm{7,5}}& r_{\mathrm{7,6}}& r_{\mathrm{7,7}}& r_{\mathrm{7,8}}\\ r_{\mathrm{8,1}}& r_{\mathrm{8,2}}& r_{\mathrm{8,3}}& r_{\mathrm{8,4}}& r_{\mathrm{8,5}}& r_{\mathrm{8,6}}& r_{\mathrm{8,7}}& r_{\mathrm{8,8}}\end{array}\right]=\left[\begin{array}{cc}{R}_i\left(\mathrm{1,1}\right)& R_i\left(\mathrm{1,2}\right)\\ R_i\left(\mathrm{2,1}\right)& R_i\left(\mathrm{2,2}\right)\end{array}\right]---\left(2\right)$

A kind of simple two submatrix coefficient correlations can be done as giving a definition:

${\mathrm{\ρ}}_i=\frac{\mathrm{sum}\left(\right|R_i\left(\mathrm{1,2}\right)\left|\right)}{2\·\mathrm{trace}\left(R_i\right)}---\left(3\right)$

If the antenna submatrix coefficient correlation ρ that calculates _iGreater than predefined certain threshold value, then user i switches to the space diversity mode, otherwise carries out the assessment of follow-up criterion.

Above-mentioned antenna submatrix coefficient correlation ρ _iCalculating can also calculate according to the mode of mean value, principle is similar.

A kind of assessment mode example of the descending many sub-districts of the UE side JD degree of freedom

UE carries out channel estimating to the sub-district that all are in the Neighboring Cell List, and the professional shared code channel sum of the adjacent sub-district interference user of adding up all channel impulse responses that surpass default power threshold Kru_adj (wherein will take advantage of 2) for the professional code channel number of spatial reuse, (annotate: this customer service is added up by the space division multiplexing mode earlier to add the shared code channel sum Kru_ho of all customer services of this sub-district, be code channel number * 2), do you judge at last whether Kru_adj+Kru_ho＞32 satisfy? if satisfy, then this user switches to the space diversity mode, otherwise carries out the assessment of follow-up criterion.

A kind of assessment example of user's downlink business throughput rate of space diversity mode and spatial multiplexing mode and modulation coding mode (MCS)

Definition $P_i=\left[\begin{array}{cc}{P}_i\left(\mathrm{1,1}\right)& P_i\left(\mathrm{1,2}\right)\\ P_i\left(\mathrm{2,1}\right)& P_i\left(\mathrm{2,2}\right)\end{array}\right]$ Be the received power matrix of user i, wherein P _i(m, n) m the received signal power measurement result of Node B antenna submatrix emission data on n root UE reception antenna of expression; Definition I=[I (1) I (2)] interference power measurement result (only consider can not disturbed removing method curb residual interference) on expression UE two antennas.

The space diversity mode

Total carrier/interface ratio (C/I) approximate evaluation of down receiving signal is:

${\left(\frac{C}{I}\right)}_i=\frac{{(\sqrt{P_i\left(\mathrm{1,1}\right)}+\sqrt{P_i\left(\mathrm{2,1}\right)})}^2}{I\left(1\right)}+\frac{{(\sqrt{P_i\left(\mathrm{1,2}\right)}+\sqrt{P_i\left(\mathrm{2,2}\right)})}^2}{I\left(2\right)}---\left(4\right)$

Then according to different MCS in above-mentioned carrier/interface ratio

Under the Block Error Rate index, calculate the highest Block Error Rate restriction (for example 10%) condition, the MCS of business throughput maximum with and corresponding throughput index.

Spatial multiplexing mode

Node B submatrix 1 transmits and in the total carrier/interface ratio of descending received signal (C/I) approximate evaluation is:

${\left(\frac{C}{I}\right)}_{i,1}=\frac{P_i\left(\mathrm{1,1}\right)}{I\left(1\right)}+\frac{P_i\left(\mathrm{1,2}\right)}{I\left(2\right)}---\left(5\right)$

Node B submatrix 2 transmits and in the total carrier/interface ratio of descending received signal (C/I) approximate evaluation is:

${\left(\frac{C}{I}\right)}_{i,2}=\frac{P_i\left(\mathrm{2,1}\right)}{I\left(1\right)}+\frac{P_i\left(\mathrm{2,2}\right)}{I\left(2\right)}---\left(6\right)$

Then according to different MCS in above-mentioned carrier/interface ratio

With

Under the Block Error Rate index, calculate the highest Block Error Rate restriction (for example 10%) condition respectively, submatrix 1 and submatrix 2 be maximum corresponding MCS and the corresponding throughput index thereof of throughput separately, at last with the throughput sum of the two submatrixs total throughout as this user.

After having provided the embodiment of top 3 committed steps, provide whole handoff procedure at the adaptive space diversity and the spatial multiplexing mode of arbitrary user i down link referring now to Fig. 2:

Step 1:Node B carries out up 8 * 2 channel estimating, comprises that this cell channel is estimated and adjacent cell channel is estimated;

Step 2:Node B if correlation is higher than a certain default thresholding, then switches to the space diversity mode with its down link, end switch decision process at the channel relevancy that user i assesses two submatrixs; Otherwise enter step 3;

Step 3: user i carries out descending 2 * 2 channel estimating, comprises that this cell channel is estimated and adjacent cell channel is estimated;

Step 4: the degree of freedom situation that user i detects descending multi-plot joint is assessed and is fed back to Node B;

Step 5:UE carries out 2 * 2 received signal power measurements, and the measurement of two reception antenna interference powers, and above-mentioned measurement result is fed back to Node B with certain form;

Does step 6:Node B judge according to the feedback result of step 4 whether adopt the degree of freedom that descending multi-plot joint detects after the spatial multiplexing mode enough? if not enough, then its down link is switched to the space diversity mode, finish the switch decision process; Otherwise enter step 7;

Step 7:Node B estimates the throughput of descending space diversity mode and spatial multiplexing mode respectively according to the feedback result of step 5, and finally switches on the big MIMO mode of throughput.

Node B descending beam shape-endowing weight value under space diversity and the spatial multiplexing mode generates

The principle basically identical of the Node B down beam shaping under space diversity and the spatial reuse, what of element number of array difference just be, the space diversity mode is 18 array element beam shaping, and spatial multiplexing mode next be two 4 array element beam shapings.

Behind the using MIMO technique, Node B down beam shaping need be considered the factor that UE side diversity antenna merges, with maximum receiving signal power is example, because the antenna of UE side merge make signal be form with power in stack, so the optimization criterion of wave beam forming should guarantee UE two antenna receiving signal power sum maximums.

If the transmitting antenna 1 of user i is R at the signal space correlation matrix that Node B receiving terminal forms _{I, 1}, transmitting antenna 2 is R at the signal space correlation matrix that Node B receiving terminal forms _{I, 2}, beam shaping weight w then _iShould for:

$w_i=\underset{w_i}{\arg }\max ({w_i}^H\·(R_{i,1}+R_{i,2})\·w_i)---\left(7\right)$

So excipient weight w of user i _iDesirable value should be square formation (R _{I, 1}+ R _{I, 2}) eigenvalue of maximum characteristic of correspondence vector.

The embodiment of uplink service and downlink business are identical, do not repeat them here.

Claims (6)

1. the multi-input multi-output system of a TDS-CDMA system outdoor macro honeycomb comprises user terminal and base station, it is characterized in that, described user terminal has two antennas that independence is weak; All array elements of described base station split into two antenna submatrixs, and all array elements in each antenna submatrix adopt same basic Midamble sign indicating number; The different antennae submatrix of the different antennae of described user terminal and described base station is all distributed different basic Midamble sign indicating numbers, or all distributes the difference skew of same basic Midamble sign indicating number; Two antennas of two antenna submatrixs of described base station and described user terminal carry out radio communication in the multiple-input and multiple-output mode of ADAPTIVE MIXED space collection multiplexing.

2. the multiple-input multiple-output method of a TDS-CDMA system outdoor macro honeycomb is applied in the system as claimed in claim 1, may further comprise the steps:

(1). the channel estimating of up each array element is carried out in the base station;

(2). the base station if correlation is not less than default thresholding, then switches to the space diversity mode with its uplink downlink, otherwise enters step (3) by the described uplink channel estimation channel relevancy between two antenna submatrixs of real-time assessment as a result;

(3). the base station is further assessed the degree of freedom situation that up multi-plot joint detects by described uplink channel estimation result; User terminal carries out down channel to be estimated, and further the degree of freedom situation that descending multi-plot joint detects is assessed according to described down channel estimated result, and described assessment result is fed back to the base station;

(4). the base station judges whether spatial multiplexing mode can provide the abundant degree of freedom to carry out up adjacent sub-district strong jamming and suppress, and if not, then uply switches to the space diversity mode, if then up assessment enters step (6); The base station also judges according to the described assessment result of user terminal feedback in the step (3) whether spatial multiplexing mode can provide the abundant degree of freedom to carry out the strong jamming of descending adjacent sub-district and suppress, if not, then descendingly switch to the space diversity mode, if then descending assessment enters step (5);

(5). user terminal carries out the received signal power measurement of base station transmit antennas submatrix to the user terminal reception antenna, and the measurement of two user terminal reception antenna interference powers, and gives the base station with above-mentioned measurement feedback;

(6). the base station is according to the channel estimation results of up base station reception antenna array element respective user terminal transmitting antenna, and the interference measurement results of each reception antenna array element of base station, respectively the customer service throughput rate under upstream space diversity mode and the upstream space multiplex mode is carried out real-time assessment, and up link is switched to the higher mode of throughput rate assessed value;

Real-time assessment is also carried out to the customer service throughput rate under descending space diversity mode and the descending spatial multiplexing mode respectively according to the described measurement result of user terminal feedback in the step (5) in the base station, and down link is switched to the higher mode of throughput rate assessed value.

3. the multiple-input multiple-output method of TDS-CDMA system outdoor macro honeycomb as claimed in claim 2 is characterized in that, switches the back for the upstream space diversity mode, and user terminal adopts double-antenna transmit diversity, generates the antenna weights of transmit diversity; And the base station merges the channel estimation results of respective user terminal two transmitting antennas on all reception antenna array elements and carry out upstream data and recover.

4. the multiple-input multiple-output method of TDS-CDMA system outdoor macro honeycomb as claimed in claim 2 is characterized in that, switches the back for descending space diversity mode, and the aerial array down beam shaping is adopted in the base station, carries out the optimization of figuration criterion; And user terminal adopts dual-antenna diversity to receive, and at first the channel estimation results with respective base station two transmitting antenna submatrixs on all reception antennas merges, and the multi-plot joint that carries out double antenna then detects, and recovers downlink data.

5. the multiple-input multiple-output method of TDS-CDMA system outdoor macro honeycomb as claimed in claim 2, it is characterized in that, switch the back for the upstream space multiplex mode, every antenna emission different pieces of information of user terminal, the modulation of every antenna and coded system adopt the similar antenna rate controlled mode of pursuing to determine; And base station receiver is included the data of user terminal different transmit antennas in antenna combined detection system equation, and the unified detection of carrying out each independent signal separates.

6. the multiple-input multiple-output method of TDS-CDMA system outdoor macro honeycomb as claimed in claim 2, it is characterized in that, switch the back for descending spatial multiplexing mode, two different data of antenna submatrix emission of base station, the coded system of each antenna submatrix adopts the similar submatrix rate controlled mode of pursuing by antenna rate controlled mode to determine that two antenna submatrixs are independently carried out the downlink wave beam excipient respectively; And the user terminal receiver is included the data of the different emission in base station submatrix in double antenna combined detection system equation, and the unified detection of carrying out each independent signal separates.

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