CN101577610A - Method and device for selecting antenna polarization and coding mode in wireless communication systems - Google Patents

Method and device for selecting antenna polarization and coding mode in wireless communication systems Download PDF

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CN101577610A
CN101577610A CNA2008100372297A CN200810037229A CN101577610A CN 101577610 A CN101577610 A CN 101577610A CN A2008100372297 A CNA2008100372297 A CN A2008100372297A CN 200810037229 A CN200810037229 A CN 200810037229A CN 101577610 A CN101577610 A CN 101577610A
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base station
portable terminal
transmitting antenna
antenna polarization
mode
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CN101577610B (en
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杨红卫
李栋
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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Abstract

The invention provides a method and a device for dynamically determining the polarization mode of a base station emitting antenna and the space coding mode in a multi-input and multi-output system. The base station of the multi-input and multi-output system firstly sends measurement auxiliary signals by at least one antenna polarization mode and one space coding mode to a mobile terminal under the management of the multi-input and multi-output system; the mobile terminal detects the quality of the signals after receiving the measurement auxiliary signals, generates the information correlative to the signal quality and feeds the information back to the base station; the base station determines the polarization mode of the emitting antenna and the space coding mode of data used when the base station sends subsequent signals to the mobile terminal according to the information after receiving the information correlative to the signal quality. Compared with the existing scheme of switching space coding modes in fixed antenna polarization mode, the invention can obviously improve the system capacity.

Description

Select the method and apparatus of antenna polarization and coded system in the wireless communication system
Technical field
The present invention relates to wireless communication system, be particularly related to the method and apparatus of determining The Research of Antenna Polarization and digital coding mode in the base station of wireless communication system, also relate to be used in the portable terminal auxiliary under it base station determine the method and apparatus of The Research of Antenna Polarization and digital coding mode.
Background technology
In more than ten years in the past, in order to improve wireless communications efficiency, multiple-input and multiple-output (MIMO, Multiple Input Multiple Output) has obtained extensive use.
In mimo system, Space Time Coding (STC, Space Time Coding) and spatial reuse coding (SM, Spatial Multiplexing) are two kinds of very important diversity, multiplex technique.STC carries out orthogonal coding in time-domain (Time Domain) and spatial domain (Space Domain) to the data symbol, is 2 in number of transmission antennas, and the quantity of reception antenna is under the situation of N, can obtain the full-diversity gain.And SM transmits a plurality of separate data symbols on a plurality of transmitting antennas, can obtain with the transmit/receive antenna number in a less capacity that becomes linear direct ratio.
In addition, in mimo system, have the possibility of multiple polarization between a plurality of transmitting antennas, common is cross polarization and perpendicular polarization.For a plurality of transmitting antennas that adopt perpendicular polarization, its transmitting power can not lose thereby the signal to noise ratio of receiving terminal higher, have higher spatial coherence but transmit.And for adopting cross-polarized a plurality of transmitting antennas, though its transmitting power has certain loss, the spatial coherence that transmits is lower.
Because STC and SM physical characteristic separately, be applicable to low signal-to-noise ratio, high spatial correlation respectively, and the environment of high s/n ratio, low spatial correlation, therefore in the ordinary course of things, when the polarization mode of transmitting antenna is perpendicular polarization, adopt STC more to help the receptivity that receiver obtains as the space encoding mode of its data symbol; And when the polarization mode of transmitting antenna is cross polarization, adopt SM more to help the receptivity that receiver obtains as the space encoding mode of its data symbol.
Fig. 2 has shown that useful signal is to interference-to-noise ratio SINR and the curve chart of cumulative distribution function C DF (Cumulative Distribution Function) under different STC/SM and antenna polarization perpendicular polarization/cross-polarized various combination.By being not difficult to find out among the figure, under with a kind of The Research of Antenna Polarization, SM has signal to noise ratio performance preferably usually than STC.
In existing mimo system, the polarization mode of base station transmit antennas all is a static configuration, so in order to obtain better receptivity, under the prerequisite that the polarization mode of this transmitting antenna is determined, the information such as quality of the downstream signal that the base station can receive according to the portable terminal place determine to send to the space encoding mode that follow-up signal adopted of this portable terminal.Such as, the polarization mode of supposing the transmitting antenna of a base station is configured to cross polarization statically, the information such as signal quality returned after can measuring the quality of downstream signal according to each portable terminal of this base station then, select a kind of among STC and the SM for each portable terminal, send the space encoding mode of follow-up downstream signal as this base station to corresponding portable terminal.
So the drawback of the polarization mode of the transmitting antenna of configurating base station is statically, when the polarization mode of transmitting antenna is cross polarization, if received signal quality is better when finding to use STC as the space encoding mode by detecting, then can select STC, but, select STC can make the systems face problem, because under the cross polarization mode, signal power losses is more, and rely on insensitive and advantage that save bit by bit is all offset by the performance degradation that power loss causes to spatial coherence, make to select STC not get a desired effect.For the transmitting antenna of perpendicular polarization mode, there is similar problem equally.
Summary of the invention
Exactly because have the problems referred to above in the prior art, the present invention proposes the method for the space encoding mode of a kind of polarization mode of in mimo system, dynamically determining base station transmit antennas and downstream signal symbol.Wherein, the quality of the downstream signal that the base station records according to portable terminal is dynamically adjusted in used The Research of Antenna Polarization and space encoding mode when this portable terminal sends downstream signal it, thereby remains the relative optimization of signal quality.
According to a first aspect of the invention, the method that is used to control downlink communication in a kind of base station of the wireless communication system based on multiple-input and multiple-output is provided, each portable terminal in one or more portable terminals that this base station is had jurisdiction at it, the signal quality relevant information of sending according to portable terminal, from the multiple transmitting antenna polarization mode of this base station, determine a kind of as the transmitting antenna polarization mode of this base station when this portable terminal sends follow-up private downlink signal, wherein, the signal quality relevant information is here indicated the quality of the downstream signal that detected this base station of this portable terminal sent with at least a transmitting antenna polarization mode.
According to a second aspect of the invention, a kind of auxiliary method of base stations control downlink communication under it that is used in the portable terminal based on the wireless communication system of multiple-input and multiple-output is provided, and at first this portable terminal receives by its base station of administration with at least a measurement auxiliary signals of sending at least a in its multiple transmitting antenna polarization mode and the multiple space encoding mode that this base station is supported; Then, this portable terminal detects the quality of received measurement auxiliary signals, to generate the signal quality relevant information; Then, this portable terminal reports to corresponding base station with the signal quality relevant information that is generated.
According to a third aspect of the present invention, a kind of downlink communication control device that is used to control downlink communication in the base station based on the wireless communication system of multiple-input and multiple-output is provided, this device comprises: the auxiliary reception device is used to receive the signal quality relevant information that one or more portable terminals of having jurisdiction over this base station are sent; The polarization control device, be used for according to described signal quality relevant information, from the multiple transmitting antenna polarization mode of this base station, determine a kind of as the transmitting antenna polarization mode of this base station when this portable terminal sends follow-up private downlink signal, wherein, described signal quality relevant information is indicated the quality of the downstream signal that detected this base station of this portable terminal sent with at least a transmitting antenna polarization mode.
According to a fourth aspect of the present invention, a kind of auxiliary servicing unit of base stations control downlink communication under it that is used in the portable terminal based on the wireless communication system of multiple-input and multiple-output is provided, this servicing unit comprises: receiving system is used for receiving by this mobile terminal affiliated base station with at least a measurement auxiliary signals of sending at least a of its multiple transmitting antenna polarization mode and its multiple space encoding mode; Checkout gear is used for the quality of received measurement auxiliary signals from the base station is detected, to generate the signal quality relevant information; Annunciator, the signal quality relevant information that is used for being generated report to corresponding base station.
Adopt method and apparatus provided by the invention, the base station can adaptive its received quality of signals of returning according to each terminal, used transmitting antenna polarization mode and space encoding mode when dynamically being chosen as the service of this portable terminal, thus the power system capacity of mimo wireless communication system improved effectively.
Description of drawings
By below in conjunction with accompanying drawing indefiniteness embodiment being described, other purpose of the present invention, feature and advantage will be more obvious.Wherein, same or analogous Reference numeral is represented same or analogous steps characteristic or device (module).
Fig. 1 show according to a specific embodiment of the present invention by the wireless communication system of forming based on the base station of MIMO and its a plurality of portable terminals of having jurisdiction over;
Fig. 2 shows when using the STC/SM mode respectively under vertical polarized antenna and the cross polarised antenna effective SINR to the curve chart of cumulative distribution function CDF;
Fig. 3 shows the systems approach flow chart of determining base station transmit antennas polarization mode and downstream signal space encoding mode in the wireless communication system based on MIMO according to the signal quality relevant information of the portable terminal that is used for having jurisdiction over according to the base station feedback of a specific embodiment of the present invention;
Fig. 4 show according to a specific embodiment of the present invention in base station, be used for based on MIMO determine transmitting antenna polarization mode and downstream signal space encoding mode the downlink communication control device block diagram and the portable terminal based on MIMO be used for auxiliary under it base station determine the servicing unit block diagram of transmitting antenna polarization mode and downstream signal space encoding mode;
Fig. 5 a-5b shows the descending sub frame structural representation according to a specific embodiment of the present invention;
Fig. 6 a-6b shows descending sub frame structural representation according to a preferred embodiment of the present invention;
Fig. 7 shows and is used to realize base station machine block diagram of the present invention according to a specific embodiment of the present invention.
Embodiment
According to the present invention, in same mimo system, when different portable terminals sends data, the base station is according to the residing different radio reception environment of corresponding mobile terminal, select rational transmitting antenna polarization mode and space encoding mode, obtain better receptivity thereby can help portable terminal, to improve the overall performance of wireless system.
Fig. 1 show according to a specific embodiment of the present invention by the wireless communication system of forming based on the base station of MIMO and its a plurality of portable terminals of having jurisdiction over.Wherein, shown in base station 10 comprise a plurality of transmitting antenna 31...3n, can support multiple different transmitting antenna polarization mode between these transmitting antennas, include but not limited to cross polarization and perpendicular polarization.According to the present invention, when practical application, above-mentioned a plurality of transmitting antennas are switched dynamically between a plurality of different polarization modes.In addition, preferably, base station 10 can utilize multiple space encoding mode that downstream signal is encoded, such as, dynamically by selecting a kind of conduct used space encoding mode when a certain portable terminal sends follow-up private downlink signal in Space Time Coding, space-frequency coding and the spatial reuse, or the like.
In the elliptical region that base station 10 shown in Figure 1 covers, on different positions, has different wireless transmission environment, as, the residing position of portable terminal difference, Signal Interference and Noise Ratio of the signal that it is received (SINR, Signal to Interference and Noise Rate) and spatial coherence (SC, Space Correlation) can be different.Usually, for being near the base station 10 also is portable terminal on the center of cell signal overlay area, because 10 is nearer and scattering thing on every side is less from the base station, its receptivity is presented as higher SINR value and higher spatial coherence, on the contrary, for distance base station 10 portable terminal far away, its natural SINR is lower, if and by chance the scattering thing is more around it, then its received signal will have lower spatial coherence.Therefore, in real system, along with the continuous variation of the residing position of portable terminal, base station 10 dynamically selects suitable transmitting antenna polarization mode and space encoding mode to serve for improving the wireless receiving performance most important for this portable terminal.
Below in conjunction with several specific embodiments; from the angle of system method provided by the present invention is described in detail; those skilled in the art understand; in following specific embodiment, do to describe only for clearly demonstrating technical scheme of the present invention; and not constituting restriction to protection scope of the present invention, protection scope of the present invention is determined by claims.
Fig. 3 shows and determines the system flow chart of base station transmit antennas polarization mode and downstream signal space encoding mode according to a specific embodiment of the present invention according to the signal quality relevant information of the measurement auxiliary signals of its portable terminal of having jurisdiction over feedback based on the base station of MIMO.Followingly the present invention is described in detail with reference to Fig. 3 and in conjunction with Fig. 1.
In one embodiment of the invention, use the present invention to control the base station of the mimo wireless communication system of downlink communication method, as shown in Figure 2 among the present invention, base station 10 be chosen as portable terminal 21 provide when service used transmitting antenna polarization mode and need rely on the signal quality of portable terminal 21 detected downstream signals during the space encoding mode, and to realize above-mentioned detection, portable terminal 21 just needs the cooperation of base station 10.Also promptly, base station 10 portable terminal 21 in step S21 carries out such detection.Wherein, according to a preferred embodiment of the present invention, base station 10 is special each portable terminal that sends measurement auxiliary signals to its subordinate in step S21, and concrete mode is as follows:
At first, perpendicular polarization (can control antenna element by the form of interior signaling) is adjusted to its transmitting antenna polarization mode in base station 10, and select STC as the employed space encoding mode of its transmitter, send v dimension training sequence (a kind of measurement auxiliary signals) as the formula (1):
{x(m，n，k)，m＝1，...，M；n＝1，...，N，k＝1，5，9，...} (1)
Next, the transmitting antenna polarization mode remains on perpendicular polarization, and base station 10 is adjusted into SM with the space encoding mode of transmitter, and sends the v dimension training sequence shown in the formula (2) to each portable terminal that it is had jurisdiction over:
{x(m，n，k)，m＝1，...，M；n＝1，...，N，k＝2，6，10，...} (2)
So far existing two kinds of the combinations of The Research of Antenna Polarization and space encoding mode, next, base station 10 changes the transmitting antenna polarization mode into cross polarization, as coded system between transmitter space, sends v dimension training sequence formula (3) shown in to each portable terminal with STC:
{x(m，n，k)，m＝1，...，M；n＝1，...，N，k＝3，7，11，...} (3)
At last, base station 10 under the cross polarization mode, as coded system between transmitter space, is sent the v dimension training sequence shown in the formula (4) with SM again:
{x(m，n，k)，m＝1，...，M；n＝1，...，N，k＝4，8，12，...} (4)
In formula (1)-(4), v is the number of transmit antennas of base station 10, and M is the data subcarrier number that uses in the OFDM symbol, and N is the number of OFDM symbol in the frame, and k then is the numbering of frame.Employed subcarrier is mutually orthogonal so that portable terminal carries out channel estimating on the different antennae.In brief, in this example, base station 10 combination with a kind of polarization mode and space encoding mode in each descending sub frame sends a training sequence, when next frame arrives, changes the combination of polarization mode and space encoding, sends next training sequence again.For the existing very detailed and ripe introduction of training sequence, the present invention no longer further launches to discuss to this in the prior art.
So far, the work that measurement auxiliary signals is provided for portable terminal has been finished in base station 10 in step S21.
The sequencing that it will be appreciated by those skilled in the art that the various combinations of above-mentioned base station 10 transmission employed transmitting antenna polarization modes of training sequence and space encoding mode only is example, and does not constitute limiting the scope of the invention.
Then, shown in step S22 among Fig. 3,21 pairs of measurement auxiliary signals that send base station 10 in step S21 of portable terminal receive, and its quality is detected, and generate the signal quality relevant information; The signal quality relevant information here can comprise Signal Interference and Noise Ratio (SINR) and/or spatial coherence parameters such as (SC), also can comprise based on the resulting quality evaluation information to received signal of these parameters, can also comprise the information such as wireless channel capacity estimation value that obtain by channel estimation methods well-known to those skilled in the art based on above-mentioned parameter.According to a preferred embodiment of the present invention, portable terminal 21 is specific as follows to the reception and the quality testing process of 10 the measurement auxiliary signals from the base station in step S22:
Corresponding to the v dimension training sequence as the formula (1) that base station 10 selects STC to send under the perpendicular polarization mode, portable terminal 21 is tieed up training sequence as the formula (5) by the U that its U reception antenna receives:
{y(m，n，k)，m＝1，...，M；n＝1，...，N，k＝1，2，3，...} (5)
In formula (5) and if the follow-up parameter that occurs in various identical with parameter in formula (1)-(4), unless special definition is then arranged herein, its represented implication is identical with implication represented in formula (1)-(4).Because above-mentioned training sequence can be informed in advance portable terminal 21 by storing the first-class mode of portable terminal in advance into, therefore can obtain formula (6):
{y(m，n，k)＝x(m，n，k)H U，V(m，n，k)+n(m，n，k)} (6)
Wherein, H U, V(m, n k) are channel response matrix, and (m, n k) are the additive white Gaussian noise (Additive Gaussian White Noise) of channel to n.
Suppose that portable terminal 21 uses maximum likelihood wave detector (ML Detector), then by calculating the capacity { C that can obtain on each carrier wave CO, STC(m, n, k), k=1,5,9 ... }, wherein this capacity be Signal Interference and Noise Ratio SINR (k), k=1,5,9 ... } and channel response { H U, V(m, n, k), k=1,5,9 ... } function.Because in MIMO detected, prior art had had the very detailed and ripe description of calculating of pair channel capacity, therefore here no longer this is further launched to discuss.
Then, portable terminal 21 can calculate average size according to formula (7):
{ C ‾ CO , STC ( k ) = 1 MN Σ m = 1 M Σ n = 1 N C CO , STC ( m , n , k ) , k = 1,5,9 , . . . } - - - ( 7 )
Subsequently, portable terminal 21 is obtaining on the basis of average size, calculates effective SINR of obtaining to quantize, is labeled as SINR Effective, CO, STC, its computational methods are to carry out according to formula (8).
SINR effective , CO , STC = 2 C ‾ CO , STC ( k ) - 1 - - - ( 8 )
In like manner, corresponding to the v dimension training sequence as the formula (2) that base station 10 selects SM to send under the perpendicular polarization mode, portable terminal 21 also can be by similar method and step, finally calculate corresponding quantization effective SINR, be labeled as SINR Effective, C0, SM, that is:
{ C ‾ CO , SM ( k ) = 1 MN Σ m = 1 M Σ n = 1 N C CO , SM ( m , n , k ) , k = 2,6,10 , . . . } - - - ( 9 )
SINR effective , CO , SM = 2 C ‾ CO , SM ( k ) - 1 - - - ( 10 )
Similarly, the v as the formula (3) that selects STC to send under the cross polarization mode corresponding to base station 10 ties up training sequence, and base station 10 select under the cross polarization mode that SM sends as the formula (4) v dimension training sequence the time, portable terminal 21 can be by above-mentioned similar method and step, finally calculate corresponding quantization effective SINR, and be labeled as SINR respectively Effective, CRO, STCAnd SINR Effective, CRO, SM, promptly be expressed as respectively:
{ C ‾ CRO , STC ( k ) = 1 MN Σ m = 1 M Σ n = 1 N C CRO , STC ( m , n , k ) , k = 3 , 7 , 11 , . . . } - - - ( 11 )
SINR effective , CRO , STC = 2 C ‾ CRO , STC ( k ) - 1 - - - ( 12 )
{ C ‾ CRO , SM ( k ) = 1 MN Σ m = 1 M Σ n = 1 N C CRO , SM ( m , n , k ) , k = 4 , 8 , 12 , . . . } - - - ( 13 )
SINR effective , CRO , SM = 2 C ‾ CO , SM ( k ) - 1 - - - ( 14 )
So far, portable terminal 21 has been finished in step S22 the measurement auxiliary signals that base station 10 provided and the work of quality testing subsequently of receiving.
The sequencing that it will be appreciated by those skilled in the art that the various combinations of employed transmitting antenna polarization mode of training sequence that above-mentioned portable terminal 21 receives and space encoding mode only is example, and does not constitute limiting the scope of the invention.
Then, in step S23, the effective SINR information that portable terminal 21 obtains it is as SINR Effective, CO, STC, SINR Effective, CO, SM, SINR Effective, CRO, STCOr SINR Effective, CRO, SM, feed back to base station 10.It will be appreciated by those skilled in the art that in a specific implementation process, be not strict with portable terminal 21 and feed back above-mentioned 4 SINR values simultaneously.In some cases, base station 10 may only send the training sequence of employing one or more combinations wherein, and 21 need of portable terminal feed back to base station 10 with the quality relevant information of the training sequence that receives and get final product.
Then, in step S24, when receiving effective SINR value SINR that portable terminal 21 feeds back Effective, CO, STCAfterwards, base station 10 can obtain corresponding channel capacity by calculating.Such as, correspondence receives SINR Effective, CO, STC, then base station 10 can obtain { C by calculating CO, STC(k), k=1,5,9...}.For how to calculate the existing very detailed and ripe introduction of acquisition channel capacity by effective SINR value, the present invention no longer further launches to discuss to this in the prior art.Similarly, corresponding to SINR Effective, CO, SM, base station 10 can obtain { C by calculating CO, SM(k), k=2,6,10...}; Corresponding to SINR Effective, CRO, STC, base station 10 can obtain { C by calculating CRO, STC(k), k=3,7,11...}; Corresponding to SINR Effective, CRO, SM, base station 10 can obtain { C by calculating CRO, SM(k), k=4,8,12...}.
Base station 10 is after calculating each channel capacity of acquisition, according to the channel capacity maximization principle, select channel capacity maximum wherein one, then base station 10 selects the channel capacity of above-mentioned maximum to be worth pairing transmitting antenna polarization mode and data space coded system as its transmitting antenna polarization mode and data space coded system, comes to the private downlink signal that sends follow-up two frames at portable terminal 21.
For instance, if satisfy simultaneously at the t frame:
{C CO，STC(4t-3)，t＝1，2，3...}＜{C CO，SM(4t-2)，t＝1，2，3...}
{C CO，STC(4t-3)，t＝1，2，3...}＜{C CRO，STC(4t-1)，t＝1，2，3...}
{C CO，STC(4t-3)，t＝1，2，3...}＜{C CRO，SM(4t)，t＝1，2，3...}
Two frames after the t frame then, promptly t+1 frame and t+2 frame base station 10 are being portable terminal 21 when sending downstream signals, the polarization mode of its transmitting antenna is selected perpendicular polarization, data space coding mode selection Space Time Coding STC.
Those skilled in the art understand, even base station 10 has sent training sequence according to being described under four kinds of states above, portable terminal 21 perhaps can can't feed back all above-mentioned 4 effective SINR values because of failing correctly to receive wherein one or more training sequences, under this kind situation, effective SINR value that portable terminal 21 feeds back to base station 10 will be 1 to 3 in above-mentioned 4 effective SINR values, then base station 10 can be calculated corresponding channel capacity respectively according to these finite information equally, select the transmitting antenna polarization mode and the space encoding mode of maximum channel capacity value correspondence afterwards, come the private downlink signal that sends in follow-up two frames to portable terminal 21.
According to said process, the transmitting antenna polarization mode and the space encoding mode of base station 10 self determined in base station 10 in the frame rank for its each portable terminal of administering.Because when each base station is served at a plurality of portable terminals of having jurisdiction over for it, generally all use same set of transmitting antenna, therefore when base station 10 be that a plurality of portable terminals are when serving simultaneously with different transmitting antenna polarization modes, particularly when base station 10 adopts time division ways to serve a plurality of user terminal of its time, base station 10 may constantly be switched between different transmitting antenna polarization modes in a descending sub frame, please referring to Fig. 5 a, Fig. 5 b.For simplicity's sake, only show two descending sub frames among Fig. 5 a, the 5b, and it lays respectively among the two adjacent frames, also, the descending sub frame in the x frame is shown in Fig. 5 a, and the descending sub frame in the x+1 frame thereafter is shown in Fig. 5 b.In addition, in the frame structure shown in, the numbering of unshowned portable terminal among Fig. 1 has appearred therein, this only be Fig. 1 for simplicity.By also showing base station 10 determined transmitting antenna polarization mode and space encoding mode that is respectively applied for each portable terminal of service in step S24 among Fig. 5 a, the 5b.
After the descending sub frame in the x frame begins, base station 10 sends the private downlink signal to portable terminal 21 earlier, concrete transmitting antenna polarization mode should be perpendicular polarization shown in Fig. 5 a, so base station 10 is adjusted into the transmitting antenna polarization mode perpendicular polarization and carries out the operation that sends the downlink dedicated signal to portable terminal 21.After this take turns to portable terminal 22, base station 10 switches to cross polarization with its transmitting antenna polarization mode again, and when taking turns to portable terminal 23, switchback perpendicular polarization once more, in a word, in descending sub frame shown in Fig. 5 a, be not inconsistent in case the current pairing transmitting antenna polarization mode of portable terminal that needs service and base station 10 are presently used, base station 10 promptly adjusts it, if by chance practical situation is shown in Fig. 5 a, 5b, then the handover operation of a large amount of transmitting antenna polarization modes will be carried out in base station 10, be unfavorable for the optimization of system.
For fear of such switching, in a preferred embodiment of the present invention, base station 10 is distributed to base station 10 with continuous time-domain resource and is used the same transmit The Research of Antenna Polarization to send a plurality of portable terminals of downstream signal to it also according to its determined transmitting antenna polarization mode when each portable terminal sends downstream signal.Shown in Fig. 6 a, 6b.As seen, base station 10 is dispatched to each portable terminal of corresponding perpendicular polarization in the same descending sub frame shown in Fig. 6 a and serves, and cross-polarized each portable terminal of correspondence is dispatched in the same descending sub frame shown in Fig. 6 b serves.Like this, in the time of two frame lengths, the switching to the transmitting antenna polarization mode advantageously can only be carried out once in base station 10.
In addition, it will be appreciated by those skilled in the art that in previously described multiple space encoding mode except Space Time Coding and spatial reuse, can also comprise other coded systems such as space-frequency coding; Except perpendicular polarization and cross polarization, also can comprise other possible polarization mode in previously described multiple transmitting antenna polarization mode.
Above, coupling system flow chart and frame assumption diagram have been done comparatively detailed description to method provided by the present invention, below, in conjunction with concrete installation drawing the device that is respectively applied in base station and the portable terminal provided by the present invention is introduced again, for convenience, the described device that is arranged in the device of base station and is arranged in portable terminal is shown in Fig. 4 uniformly.
Also with reference to Fig. 1, is example with base station shown in Figure 1 10 with portable terminal 20 below in conjunction with the description of Fig. 4 specifically.Base station 10 comprises the downlink communication control device 101 that is used to control downlink communication, and portable terminal 21 comprises the servicing unit 211 that is used for auxiliary its affiliated base stations control downlink communication.In order to strengthen logic and readability, hereinafter will carry out according to the mode of system works flow process the introduction of device.
For transmitting antenna polarization mode and the space encoding mode that is defined as adopting when portable terminal 21 sends the private downlink signal, at first, at least a in the multiple transmitting antenna polarization mode that the measurement servicing unit 1011 at 10 places, base station can be supported with base station 10, and at least a in the multiple space encoding mode of being supported with base station 10 send measurement auxiliary signals to each portable terminal that comprises portable terminal 21, the quality of the measurement auxiliary signals that is sent for portable terminal 21 base stations detected 10.
Particularly, measure servicing unit 1011 and can earlier the transmitting antenna polarization mode of base station 10 be adjusted to perpendicular polarization (can control antenna element by the form of interior signaling), and select STC as the employed space encoding mode of its transmitter, send the v dimension training sequence shown in preamble Chinese style (1); Next, the transmitting antenna polarization mode with base station 10 remains on perpendicular polarization again, and the space encoding mode of transmitter is adjusted into SM, and sends the dimension of the v shown in the formula (2) training sequence as mentioned before to each portable terminal that it is had jurisdiction over; Then, the transmitting antenna polarization mode with base station 10 changes cross polarization into again, as coded system between transmitter space, sends as mentioned before v formula (3) shown in dimension training sequence to each portable terminal with STC; At last, keep transmitting antenna under the cross polarization mode, as coded system between transmitter space, send the dimension of the v shown in the formula (4) training sequence as mentioned before with SM.In brief, in this example, measure servicing unit 1011 combination with a kind of polarization mode and space encoding mode in each descending sub frame and send a training sequence, when next descending sub frame arrives, change the combination of polarization mode and space encoding, send next training sequence again.For the existing very detailed and ripe introduction of training sequence, the present invention no longer further launches to discuss to this in the prior art.
By after measuring the above-mentioned measurement auxiliary signals of servicing unit 1011 transmissions, the servicing unit 211 at portable terminal 21 places can receive from base station 10 described measurement auxiliary signals by its receiving system 2111 in base station 10.
Particularly, at measuring the v dimension training sequence shown in the formula as mentioned before (1) that servicing unit 1011 sends, receiving system 2111 can receive by U reception antenna of portable terminal 21 U dimension training sequence also available formula as mentioned before (5) represent; Similarly, the Chinese style as mentioned (2), the v shown in (3) or (4) that send at measurement servicing unit 1011 tie up training sequence, and receiving system 2111 can be received corresponding U dimension training sequence too.Then, receiving system 2111 passes to checkout gear 2112 with received signal.
And then, the checkout gear 2112 at portable terminal 21 places can detect the quality of the above-mentioned measurement auxiliary signals that receives, to generate the signal quality relevant information.
Particularly, at measuring the v dimension training sequence as the formula (1) that servicing unit 1011 is sent, checkout gear 2112 uses maximum likelihood wave detector (ML Detector), then by calculating the capacity { C that can obtain each carrier wave CO, STC(m, n, k), and k=1,5,9 ..., wherein this capacity is { SINR (k), k=1,5,9 ..} and { H U, V(m, n, k), k=1,5,9 ... } function.Then, can calculate corresponding average size { C according to the computational methods shown in the formula (7) CO, STC(k) k=1,5,9 ..., subsequently, calculate the effective SINR that quantizes according to formula (8) again, be designated as SINR Effective, CO, STCAnd tie up training sequence suc as formula the v shown in (2), (3) or (4) for what measurement servicing unit 1011 was sent, checkout gear 2112 also will adopt similar method, according to formula (9) and (10), formula (11) and (12), formula (13) and (14) calculating, be designated as SINR respectively respectively Effective, CO, SM, SINR Effective, CRO, STCAnd SINR Effective, CRO, SMEffective SINR value.
Then, effective SINR value of the expression measurement auxiliary signals quality that checkout gear 2112 will calculate passes to annunciator 2113, and the latter is with SINR Effective, CO, STC, SINR Effective, CO, SM, SINR Effective, CRO, STCAnd SINR Effective, CRO, SMReport to base station 10 as the signal quality relevant information by up channel.
Subsequently, the auxiliary reception device 1012 at 10 places, base station receives the signal quality relevant information of expression measurement auxiliary signals quality.Particularly, can be effective SINR value as indicated above, such as SINR Effective, CO, STC, SINR Effective, CO, SM, SINR Effective, CRO, STCAnd SINR Effective, CRO, SMDeng.
Auxiliary reception device 1012 passes to received above-mentioned information respectively polarization control device 1013 and coding control 1014 again.
The signal quality relevant information that polarization control device 1013 is sent according to portable terminal 21 is determined a kind of as the transmitting antenna polarization mode of this base station when this portable terminal sends follow-up private downlink signal from the multiple transmitting antenna polarization mode of base station 10.
Particularly, at the effective SINR value SINR that receives Effective, CO, STC, polarization control device 1013 can obtain corresponding channel capacity { C by calculating CO, STC(k), k=1,5,9...}.Similarly, corresponding to SINR Effective, CO, SM, can calculate acquisition { C CO, SM(k), k=2,6,10...}; Corresponding to SINR Effective, CRO, STC, can calculate acquisition { C CRO, STC(k), k=3,7,11...}; Corresponding to SINR Effective, CRO, SM, can calculate acquisition { C CRO, SM(k), k=4,8,12...}.After calculating each channel capacity of acquisition, according to the channel capacity maximization principle, select channel capacity maximum wherein one, and in two follow-up descending sub frames when portable terminal 21 sends the private downlink signals, the transmitting antenna polarization mode that guarantees base station 10 self is pairing transmitting antenna polarization mode for this maximum channel capacity is worth.
Similarly, the signal quality relevant information that coding control device 1014 is sent according to portable terminal 21 is determined a kind of as the space encoding mode of this base station when this portable terminal sends follow-up private downlink signal from the multiple space encoding mode of base station 10.
Particularly, at the effective SINR value SINR that receives Effective, CO, STC, coding control device 1014 can obtain corresponding channel capacity { C by calculating CO, STC(k), k=1,5,9...}.Similarly, corresponding to SINR Effective, CO, SM, can calculate acquisition { C CO, SM(k), k=2,6,10...}; Corresponding to SINR Effective, CRO, STC, can calculate acquisition { C CRO, STC(k), k=3,7,11...}; Corresponding to SINR Effective, CRO, SM, can calculate acquisition { C CRO, SM(k), k=4,8,12...}.After calculating each corresponding channel capacity of acquisition, according to the channel capacity maximization principle, select channel capacity maximum wherein one, and in two follow-up descending sub frames when portable terminal 21 sends the private downlink signals, guarantee the space encoding mode used base station 10 for this maximum channel capacity is worth pairing space encoding mode.
In the present embodiment, more preferably, described downlink communication control device 101 also comprises a resource allocation device 1015, and after polarization control device 1013 has been determined to be used to serve the transmitting antenna polarization mode of each portable terminal, it will determine that the result informs resource allocation device 1015.When distributing time-domain resource for portable terminal, resource allocation device 1015 is distributed to base station 10 with continuous time-domain resource and is used the same transmit The Research of Antenna Polarization to send a plurality of portable terminals of follow-up private downlink signal to it.Concrete resource allocation result is shown in Fig. 6 a, 6b.
Fig. 7 further shows and is used for device block diagram that downlink communication is controlled according to a specific embodiment of the present invention in the base station based on MIMO.Wherein, downlink communication control device provided by the present invention comes specific implementation by the device of switch controller by name, as seen, it determines that by polarization mode being determined result and coded system the result informs the spatial encoder that is used for specifically carrying out the polarization controller of transmitting antenna polarization mode adjustment and is used for specifically carrying out space encoding respectively, to control this base station in The Research of Antenna Polarization and space encoding mode used when different mobile terminal sends the private downlink signal.
In order to further specify technique effect of the present invention, carried out the l-G simulation test of system level (system-level), suppose that channel is an ideal communication channel, emulation mode is specific as follows:
1, obtains Block Error Rate (Block Error Rate) to the signal to noise ratio (snr) performance at AWGN (additive white Gaussian noise) channel at different modulating-coding framework (Modulation Coding schemes);
2, serving sector (Serving Sectors) and interference sector (Interfering Sectors) user that is scattered at random;
3,, produce perpendicular polarization 2x2 attenuation channel matrix H with SCME (Spatial Channel Model Extended) model for pure mimo system; And for MIMO+BF (BeamingForming) system, for all users at serving sector and interference sector produce perpendicular polarization 4x2 attenuation channel matrix H with SCME;
4,, ignore this step for pure mimo system; For MIMO+BF (BeamingForming) system, for each user for the time/frequency resource block of having distributed, calculate the covariance matrix R1=E{[h1 h2 of two channel matrixes (suppose ideal communication channel measure)] ' [h1 h2] } and R2=E{[h3 h4] ' [h3 h4];
5,, ignore this step for pure mimo system; For MIMO+BF (BeamingForming) system, be all users at serving sector and interference sector, the maximum characteristic vector (max eigen vector of R1) that R1, R2 are set respectively is [w1 w2] and [w3 w4];
6, obtain antenna gain (antenna gain) for pure mimo system; For the MIMO+BF system, obtain wave beam and form antenna gain (beamformed antenna gain) (maximum array with about 3dB gains, the power gain of 6dB on than cross direction), these gains will be used for the calculating of received signal power and interference power;
7,, produce perpendicular polarization 2x2 attenuation channel matrix H with the SCME model for pure mimo system; And, produce perpendicular polarization 4x2 attenuation channel matrix H with SCME for MIMO+BF (Beaming Forming) system; Then to the subcarrier merchant application specification weighing vector W=[w1 w2 00 of all time-frequency resources that distributed; 00 w1 w2] ', to obtain the 2x2 equivalent channels function of each half-wave subcarrier;
8,, calculate reprocessing (post-processing) SINR of each subcarrier at space-time block code technology STBC or spatial reuse SM based on the signal power that receives, interference power, equivalent channels matrix and noise power;
9, utilize the Gaussian capacity formula to calculate effective SINR of each OFDM symbol, selection has the STC/MIMO pattern or the SM/MIMO pattern of maximum mean capacity;
10, in the AWGN signal that obtains in advance, utilize the different MCR BLER performance of effective SINR inquiry, to obtain throughput (throughout);
11, all STC/SM under vertical polarized antenna are switched, obtain throughput and availability statistics (throughput and availability statistics);
12, replace vertical polarized antenna with cross polarised antenna, repeating step 1-11 switches all STC/SM under cross polarised antenna, obtains throughput and availability statistics;
13, respectively with STC under the vertical polarized antenna and the SM under the cross polarised antenna, repeating step 1-11 to all STC/SM under polarization mode is switched, obtains throughput and availability statistics then.
Consider that the present invention is applicable to pure mimo system and MIMO+BF system simultaneously, therefore in two kinds of systems, carry out above-mentioned emulation respectively.
The concrete simulated conditions that adopts during table 1 system emulation
Cell deployment WiMAX DL, 7 sub-districts, 3 sectors/cells The antenna gain of travelling carriage 4.1dBi
Fading channel model 3GPP city Microcell and suburb macrocell (NLOS) The antenna gain of base station 17dBi
Centre frequency 2.35G FFT size/virtual subnet carrier wave 1024/840
Subcarrier permutation The PUSC that defines among the 16e loads fully Travelling carriage is realized loss 5dB
Antenna bearingt 3 fan antennas that define among the 3GPP The travelling carriage noise factor 5dB
Radius of society 350 meters The base station height 30 meters
Sector grid (sector gridding) 841 lattice The Reference BTS antenna number 4
Path loss prediction model The Hata model The travelling carriage height 1.5 rice
Frequency re-use factor 1 Benchmark mobile portable antennas # 2
Every sector number of users 5 Shadow model Relevant (correlated)
Every user's number of subchannels 6 The shade standard deviation 8.0dB
The base station cable losses 0dB Noise power spectral density -174.3dBm/Hz
The rf filtering loss 0.5dB Loss through walls 10dB
Scheduling Random schedule Effective SINR Equivalent signal-to-noise ratio based on capacity
Chnnel coding CTC Business model Best effort
Modulation and Coding Scheme MCS QPSK 1/2 with 0，1，2 and 3 repetitions，3/4， 16QAM 1/2，3/4 64QAM 1/2，3/4 Base station transmitting power 35dBm/ power amplifier (PA)
System-level simulation result under the table 2MIMO scheme
Figure A20081003722900241
The system-level simulation result of MIMO+BF (beam shaping) scheme in the microcellulor of table 3 city
Switch the STC/SM scheme Capacity (bits/Hz/sector) Coverage rate (%)
Switch the STC/SM+ vertical polarized antenna 1.73 98.7
Switch the STC/SM+ cross polarised antenna 1.74 98.6
Switch STC/SM+ and switch polarization mode 1.84 99.0
Table 4 has shown the simulation result of MIMO+BF system in the macrocellular of suburb.
Switch the STC/SM scheme Capacity (bits/Hz/sector) Coverage rate (%)
Switch the STC/SM+ vertical polarized antenna 1.32 97.0
Switch the STC/SM+ cross polarised antenna 1.42 95.8
Switch STC/SM+ and switch polarization mode 1.48 96.0
Table 1 has been enumerated the condition that is provided with of emulation, and wherein the physical layer analog link adopts WiMAX MTG (Mobile Task Group) the given combination of mobile task groups fully.
Table 2 has shown system-level about capacity (being labeled as Cap.) and coverage rate coverageprobability (being labeled as Cov.) switch at STC/SM under the vertical polarized antenna respectively, switch at STC/SM under the cross polarised antenna, performance under the pattern that The Research of Antenna Polarization and STC/SM switch.Do not use HARQ (mix automatically and retransmit) and duplication code.We can see from table 3, compare to switch STC/SM under the vertical polarized antenna, and the SM that switches polarization mode has improved the capacity of SM, and has only reduced the capacity of STC slightly; Switch STC/SM under the cross polarised antenna and compare, the STC that switches polarization mode has improved the capacity of STC, and has only reduced the capacity of SM slightly.So, from switch polarization mode, can obtain the whole volume gain and be about 3%～7%, specifically depend on the system that is used for reference.
Table 3 and table 4 have shown under different MIMO+BF schemes in the city microcellulor and suburb macrocellular the performance of capacity and coverage rate on the system level.In the microcellulor of city, spatial coherence is very serious frequently, the STC/SM+BF that vertical polarized antenna switches down can obtain to cross polarised antenna under similar performance.In the macrocellular of suburb, spatial coherence is very serious, obviously can use cross polarised antenna with improvement SM performance, so the STC/SM of the switching under the cross polarised antenna can obtain more performance than vertical polarized antenna.Then, above-mentioned two kinds of schemes is any also less than the STC/SM that switches under the polarization mode.Under the situation of similar coverage rate, the STC/SM scheme under this switching polarization mode that the present invention proposes can increase by 6% capacity nearly.
From above-mentioned simulation result as can be seen, the method and the device thereof of the space encoding mode of a kind of polarization mode of dynamically determining base station transmit antennas in mimo system that proposes of the present invention and downstream signal symbol are very effective for improving the mimo wireless communication system performance.
Although above-mentioned being illustrated as the invention provides some embodiment; be not to be used for limiting protection scope of the present invention; the professional in present technique field can carry out various modifications to embodiment under the prerequisite that does not depart from the scope of the present invention with spirit, this modification all belongs in the scope of the present invention.

Claims (28)

1. a method that is used to control downlink communication in the base station based on the wireless communication system of MIMO is characterized in that, comprises the steps:
A. each portable terminal in one or more portable terminals of having jurisdiction at this base station, the signal quality relevant information of sending according to described portable terminal, from the multiple transmitting antenna polarization mode of this base station, determine a kind of as the transmitting antenna polarization mode of this base station when this portable terminal sends follow-up private downlink signal, wherein, described signal quality relevant information is indicated the quality of the downstream signal that detected this base station of this portable terminal sent with at least a transmitting antenna polarization mode.
2. method according to claim 1 is characterized in that, also comprises:
I. each portable terminal in described one or more portable terminals of having jurisdiction at this base station, according to the described signal quality relevant information that this portable terminal is sent, from the multiple space encoding mode of this base station, determine a kind of as the space encoding mode of this base station when this portable terminal sends follow-up private downlink signal.
3. method according to claim 2 is characterized in that, also comprises before described step a, the i:
X. at least a with in the described multiple transmitting antenna polarization mode, and send measurement auxiliary signals to described one or more portable terminals with at least a in the described multiple space encoding mode, detect the quality of the described measurement auxiliary signals that this base station sends for described each portable terminal.
4. method according to claim 3 is characterized in that, described multiple transmitting antenna polarization mode comprises cross polarization and perpendicular polarization, and described multiple space encoding mode comprises Space Time Coding, space-frequency coding and spatial reuse.
5. according to each described method in the claim 1 to 4, it is characterized in that described step a comprises:
-at described each portable terminal,, determine that the more excellent transmitting antenna polarization mode of signal quality is as the transmitting antenna polarization mode of determined this base station when this portable terminal sends the private downlink signal according to described signal quality relevant information.
6. method according to claim 5 is characterized in that, described step I comprises:
-at described each portable terminal,, determine that the more excellent space encoding mode of signal quality is as the space encoding mode of determined this base station when this portable terminal sends the private downlink signal according to described signal quality relevant information.
7. according to claim 5 or 6 described methods, it is characterized in that described signal quality relevant information comprises channel capacity, described step a also comprises:
-at described each portable terminal, determine that the bigger transmitting antenna polarization mode of channel capacity is as the transmitting antenna polarization mode of determined this base station when this portable terminal sends the private downlink signal.
8. method according to claim 6 is characterized in that, described step I also comprises:
-at described each portable terminal, determine that the bigger space encoding mode of channel capacity is as the space encoding mode of determined this base station when this portable terminal sends the private downlink signal.
9. according to each described method in the claim 1 to 8, it is characterized in that, also comprise:
-according to the transmitting antenna polarization mode of determined this base station when described each portable terminal sends follow-up private downlink signal, continuous time-domain resource is distributed to this base station use the same transmit The Research of Antenna Polarization to send a plurality of portable terminals of follow-up private downlink signal to it.
10. one kind is used for the auxiliary method of base stations control downlink communication under it in the portable terminal based on the wireless communication system of MIMO, wherein, may further comprise the steps:
O. receive by described base station with at least a measurement auxiliary signals of sending at least a and its multiple space encoding mode in its multiple transmitting antenna polarization mode;
P. the quality to received described measurement auxiliary signals detects, to generate the signal quality relevant information;
Q. the signal quality relevant information that is generated is reported to described base station.
11. method according to claim 10 is characterized in that, described multiple transmitting antenna polarization mode comprises cross polarization and perpendicular polarization, and described multiple space encoding mode comprises Space Time Coding, space-frequency coding and spatial reuse.
12. a downlink communication control device that is used to control downlink communication in the base station based on the wireless communication system of MIMO is characterized in that, comprising:
The auxiliary reception device is used to receive the signal quality relevant information that one or more portable terminals of having jurisdiction over this base station are sent;
The polarization control device, be used for according to described signal quality relevant information, from the multiple transmitting antenna polarization mode of this base station, determine a kind of as the transmitting antenna polarization mode of this base station when this portable terminal sends follow-up private downlink signal, wherein, described signal quality relevant information is indicated the quality of the downstream signal that detected this base station of this portable terminal sent with at least a transmitting antenna polarization mode.
13. downlink communication control device according to claim 12 is characterized in that, also comprises:
The coding control device, each portable terminal that is used for described one or more portable terminals of having jurisdiction at this base station, according to the described signal quality relevant information that this portable terminal is sent, from the multiple space encoding mode of this base station, determine a kind of as the space encoding mode of this base station when this portable terminal sends follow-up private downlink signal.
14. downlink communication control device according to claim 13 is characterized in that, also comprises:
Measure servicing unit, be used at least a with described multiple transmitting antenna polarization mode, and send measurement auxiliary signals to described one or more portable terminals with at least a in the described multiple space encoding mode, detect the quality of the described measurement auxiliary signals that this base station sends for described each portable terminal.
15. downlink communication control device according to claim 14 is characterized in that, described multiple transmitting antenna polarization mode comprises cross polarization and perpendicular polarization, and described multiple space encoding mode comprises Space Time Coding, space-frequency coding and spatial reuse.
16., it is characterized in that described polarization control device also is used for according to each described downlink communication control device in the claim 12 to 15:
-at described each portable terminal,, determine that the more excellent transmitting antenna polarization mode of signal quality is as the transmitting antenna polarization mode of determined this base station when this portable terminal sends the private downlink signal according to described signal quality relevant information.
17. downlink communication control device according to claim 16 is characterized in that, described coding control device also is used for:
-at described each portable terminal,, determine that the more excellent space encoding mode of signal quality is as the space encoding mode of determined this base station when this portable terminal sends the private downlink signal according to described signal quality relevant information.
18. according to claim 16 or 17 described downlink communication control device, it is characterized in that described signal quality relevant information comprises channel capacity, described polarization control device also is used for:
-at described each portable terminal, determine that the bigger transmitting antenna polarization mode of channel capacity is as the transmitting antenna polarization mode of determined this base station when this portable terminal sends the private downlink signal.
19. downlink communication control device according to claim 17 is characterized in that, described coding control device also is used for:
-at described each portable terminal, determine that the bigger space encoding mode of channel capacity is as the space encoding mode of determined this base station when this portable terminal sends the private downlink signal.
20. according to each described downlink communication control device in the claim 12 to 19, it is characterized in that, also comprise:
Resource allocation device, be used for continuous time-domain resource being distributed to this base station using the same transmit The Research of Antenna Polarization to send a plurality of portable terminals of follow-up private downlink signal to it according to the transmitting antenna polarization mode of determined this base station when described each portable terminal sends follow-up private downlink signal.
21. one kind is used for the auxiliary servicing unit of base stations control downlink communication under it, wherein, comprises in the portable terminal based on the wireless communication system of MIMO:
Receiving system is used for receiving by described base station with at least a measurement auxiliary signals of sending at least a of its multiple transmitting antenna polarization mode and its multiple space encoding mode;
Checkout gear is used for the quality of received described measurement auxiliary signals is detected, to generate the signal quality relevant information;
Annunciator, the signal quality relevant information that is used for being generated reports to described base station.
22. servicing unit according to claim 21 is characterized in that, described multiple transmitting antenna polarization mode comprises cross polarization and perpendicular polarization, and described multiple space encoding mode comprises Space Time Coding, space-frequency coding and spatial reuse.
23. one kind based on the base station in the wireless communication system of MIMO, it is characterized in that, comprises according to each described downlink communication control device that is used to control downlink communication in the claim 12 to 20.
24. one kind based on the portable terminal in the wireless communication system of MIIMO, it is characterized in that, comprises the servicing units according to claim 21 or 22 described auxiliary these mobile terminal affiliated base stations control downlink communications.
25. a method that is used to control downlink communication in the wireless communication system based on MIMO is characterized in that, may further comprise the steps:
A. the base station is at each portable terminal in its one or more portable terminals of having jurisdiction over, the signal quality relevant information of sending according to described portable terminal, from the multiple transmitting antenna polarization mode of described base station, determine a kind of as the transmitting antenna polarization mode of described base station when this portable terminal sends follow-up private downlink signal, wherein, described signal quality relevant information is indicated the quality of the downstream signal that the detected described base station of this portable terminal sent with at least a transmitting antenna polarization mode.
26. method according to claim 25 is characterized in that, also comprises step:
I. described base station is at each portable terminal in its described one or more portable terminals of having jurisdiction over, according to the described signal quality relevant information that this portable terminal is sent, from the multiple space encoding mode of described base station, determine a kind of as the space encoding mode of described base station when this portable terminal sends follow-up private downlink signal.
27. method according to claim 26 is characterized in that, also comprises before described steps A, the I:
W. at least a with in the described multiple transmitting antenna polarization mode of described base station, and send measurement auxiliary signals to described one or more portable terminals with at least a in the described multiple space encoding mode, detect the quality of the described measurement auxiliary signals that described base station sends for described each portable terminal;
Also comprise after the step W:
X. described one or more portable terminal receives the described measurement auxiliary signals of being sent by described base station;
Y. described one or more portable terminals detect the quality of received described measurement auxiliary signals, to generate the signal quality relevant information;
Z. described one or more portable terminals report to described base station with the signal quality relevant information that is generated.
28. method according to claim 27 is characterized in that, described multiple transmitting antenna polarization mode comprises cross polarization and perpendicular polarization, and described multiple space encoding mode comprises Space Time Coding, space-frequency coding and spatial reuse.
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