CN1946000A - Method and system for realizing down link self adaption in multiple users multiple input and multiple output system - Google Patents
Method and system for realizing down link self adaption in multiple users multiple input and multiple output system Download PDFInfo
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Abstract
This invention relates to a method and a system for realizing adaptive down-link in the multi-user multi-in/out system including the following steps: UE measure the channel state of a down-link and feeds it to the base station, which distributes sub-carriers to the UE based on the state information and informs the distribution result to the corresponding UE, which estimates the channel quality of the down channel based on the sub-carrier and feeds back the information to the base station, which selects corresponding emission antennas and modulates each selected antenna adaptively and selects the code mode to distribute and control the emission power.
Description
Technical field
The present invention relates to multiple-input and multiple-output (MIMO) wireless communication system, relate in particular to a kind of method and system that in multi-user MIMO system, realize down link self adaption.
Background technology
In the system of broadband wireless communication in future, the severe challenge of multidiameter fading channel and bandwidth efficiency two aspects will be faced mainly.And, how to improve the availability of frequency spectrum and data transmission rate and become one of key issue of next generation wireless communication systems face.
According to the demand of each big operator of the whole world, the wireless communication system of wishing the 3GPP Long Term Evolution reaches the peak rate of 100Mbps at down link, at the up peak rate that then will reach 50Mbps.Reach this requirement, a kind of effective method is exactly a plurality of antennas are all disposed in employing in base station and terminal multiple-input and multiple-output (MIMO) system.
On the other hand, link circuit self-adapting (Link Adaptation, LA) technology has very strong advantage aspect the raising message transmission rate and the availability of frequency spectrum, and then become at present and one of key technology of future mobile communication system, it comprises the dynamic adjustment at interior various transmission parameters of time domain, frequency domain and spatial domain, with the variation of adaptive channel.
Adaptive modulation and coding (AMC) is the main contents in the conventional link adaptive technique, its basic principle is exactly the form that changes modulation and coding, and it is adapted with channel condition in the system constraint scope, channel condition then can be estimated by sending feedback.In the AMC system, have the good quality channel condition, for example near the user of base station, be assigned with the higher Modulation and Coding Scheme of rank (Modulation and Coding Scheme, MCS), 16QAM for example, the Turbo code of 3/4 code check, the interference free performance and the error correcting capability of this Modulation and Coding Scheme are relatively poor, to having relatively high expectations of channel quality, but can win higher data speed, improve the average data throughput of link.On the contrary, be in the user of cell boarder, channel fading is serious or existence is serious disturbs and noise, the rank that is assigned with is lower, have strong error correcting capability, noise proof feature is the Modulation and Coding Scheme of Modulation and Coding Scheme preferably, for example QPSK, the Turbo code of 1/2 code check is to guarantee the reliable transmission of data.
Adopt the benefit of AMC to mainly contain: the user who sits pretty can have higher data rate, and the honeycomb average throughput is improved thus; In the link circuit self-adapting process, can reduce interference level by the method for adjusting Modulation and Coding Scheme rather than adjustment transmitting power.
Yet present existing link adaptation scheme just relates to the situation of single antenna, and only be mainly concerned with adaptive modulation and coding, adaptive bit and rate-allocation, mixing retransmits technology such as (HARQ) automatically.But, along with the continuous development of user for radio communication High Data Rate and high spectrum utilization demand, particularly at the 4th generation wireless communication system, MIMO and the discussion of OFDM Study on Technology are being carried out around 3GPP Long Term Evolution (LTE) in each big telecom operators of the whole world and device fabrication commercial city at present, and in the technical need report 3GPP TR 25.913 that is entitled as " Requirements for evolvedUniversal Terrestrial Radio Access (UTRA) and Universal Terrestrial RadioAccess Network (UTRAN) " that announced in 2005, the speed of radio communication has proposed the requirement of descending 100Mbps of reaching and the up 50Mbps of reaching to future, this just needs to adopt MIMO technology and OFDM technology, take into full account the adaptive technique of link in physical layer, realize making full use of of system resource.Therefore, this just need expand to the link adaptation techniques under single user and the single-antenna case in the multi-user MIMO system.Yet,, therefore specifically how in multi-user MIMO system, to realize down link self adaption, at present also without any substantial progress because the technical factor that need take all factors into consideration is numerous.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method and system that realize down link self adaption in multiuser mimo system, improves the spectrum utilization efficiency and the channel capacity of system, makes full use of the resource of wireless system.
For this reason, the invention provides a kind of method that in multiuser mimo system, realizes down link self adaption, comprise the steps:
The user equipment allocation subcarrier is given in the base station, and notifies corresponding user equipment with allocation result;
Subscriber equipment is estimated the down channel corresponding channel quality according to the subcarrier that is distributed, and this channel quality information feedback is arrived the base station;
Corresponding transmitting antenna is selected according to the channel quality information of described subscriber equipment feedback in the base station;
The base station is according to described channel quality information, and selected transmitting antenna information, every selected antenna is carried out the adaptive modulation and coding mode select.
The present invention can further include step:
Transmit power allocations and control are carried out to every selected antenna in the base station.
Wherein, described base station is a user equipment allocation subcarrier step, can be that the base station is distributed according to the downlink channel quality state of being measured by subscriber equipment.
Wherein, described base station is the user equipment allocation subcarrier, and notifies the corresponding user equipment step with allocation result, can be to notify corresponding user by the control link.
Wherein, described base station is the user equipment allocation subcarrier, and notifies the corresponding user equipment step with allocation result, can comprise the steps:
Subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station;
The user equipment allocation subcarrier is given according to the downlink channel status information that receives in the base station, and with the corresponding subscriber equipment of allocation result notice.
Wherein, described subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station step, can comprise the steps:
Subscriber equipment receives the pilot frequency information from the base station;
Subscriber equipment decoding pilot frequency information obtains the frequency pilot sign of every transmit antennas;
Subscriber equipment utilizes this frequency pilot sign measurement to estimate the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Subscriber equipment will be measured the SINR feedback information estimating to obtain to the base station.
Wherein, corresponding transmitting antenna step is selected according to the channel quality information of described subscriber equipment feedback in described base station, can comprise the steps:
The down channel corresponding channel quality information of subscriber equipment feedback is assessed in the base station;
If this channel quality information is higher than predetermined threshold value, then the specific transmitting antenna of this channel quality information correspondence is selected for emission.
Wherein, described channel quality information can be the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
The present invention also provides a kind of method that realizes down link self adaption in multiuser mimo system, comprises the steps:
Subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station;
The user equipment allocation subcarrier is given according to the downlink channel status information that receives in the base station, and with the corresponding subscriber equipment of allocation result notice;
Subscriber equipment is estimated the down channel corresponding channel quality according to the subcarrier that is distributed, and this channel quality information feedback is arrived the base station;
Corresponding emitting antenna selecting is carried out according to the channel quality information of subscriber equipment feedback in the base station;
The base station is according to the channel quality information of subscriber equipment feedback, and selected transmitting antenna information, every selected antenna is carried out the adaptive modulation and coding mode select.
The present invention can further include step:
Transmit power allocations and control are carried out to every selected antenna in the base station.
Wherein said subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station step, can comprise the steps:
Subscriber equipment receives the pilot frequency information from the base station;
Subscriber equipment decoding pilot frequency information obtains the frequency pilot sign of every transmit antennas;
Subscriber equipment utilizes this frequency pilot sign measurement to estimate the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Subscriber equipment will be measured the SINR feedback information estimating to obtain to the base station.
Wherein, described channel quality information can be the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
The present invention and then a kind of system that realizes down link self adaption in multiuser mimo system is provided comprises:
Be used to make the base station to give the user equipment allocation subcarrier, and allocation result notified the device of corresponding user equipment;
Be used to make subscriber equipment to estimate the down channel corresponding channel quality according to the subcarrier that is distributed, and with the device of this channel quality information feedback to the base station;
Be used to make the channel quality information of base station, select the device of corresponding transmitting antenna according to described subscriber equipment feedback;
Be used to make the base station according to described channel quality information, and selected transmitting antenna information, every selected antenna is carried out the device that the adaptive modulation and coding mode is selected.
The present invention can further include:
Be used to the device that makes the base station carry out transmit power allocations and control to every selected antenna.
Wherein, describedly being used to make the base station to give the user equipment allocation subcarrier, and notifying the device of corresponding user equipment with allocation result, can be that the base station is distributed according to the downlink channel quality state of being measured by subscriber equipment.
Wherein, describedly be used to make the base station to give the user equipment allocation subcarrier, and notify the device of corresponding user equipment, can comprise allocation result:
The device that is used to make the channel status of user's device measuring down link and corresponding channel condition information is fed back to the base station;
Be used to make the base station according to the downlink channel status information that receives, give the user equipment allocation subcarrier, and the device of the subscriber equipment that the allocation result notice is corresponding.
Wherein, the described channel status that is used to make user's device measuring down link also feeds back to the device of base station with corresponding channel condition information, can comprise:
Be used to make the device of subscriber equipment reception from the pilot frequency information of base station;
Be used to make user's device decodes pilot frequency information to obtain the device of the frequency pilot sign of every transmit antennas;
Be used to make this frequency pilot sign measurement of user's equipment utilization to estimate the device of the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Be used to make subscriber equipment to measure to estimate the SINR feedback information that obtains device to the base station.
Wherein, the described channel quality information that is used to make the base station according to described subscriber equipment feedback is selected the device of corresponding transmitting antenna, can comprise:
The device that is used to make the base station that the down channel corresponding channel quality information of subscriber equipment feedback is assessed;
Be used for when this channel quality information is higher than predetermined threshold value, make the specific transmitting antenna of this channel quality information correspondence be selected for the device of emission.
Wherein, described channel quality information can be the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
The present invention and then also a kind of system that realizes down link self adaption in multiuser mimo system comprise:
The device that is used to make the channel status of user's device measuring down link and corresponding channel condition information is fed back to the base station;
Be used to make the base station according to the downlink channel status information that receives, give the user equipment allocation subcarrier, and the device of the subscriber equipment that the allocation result notice is corresponding;
Be used to make subscriber equipment to estimate the down channel corresponding channel quality according to the subcarrier that is distributed, and with the device of this channel quality information feedback to the base station;
Be used to make the base station to carry out the device of corresponding emitting antenna selecting according to the channel quality information of subscriber equipment feedback;
Be used to make the channel quality information of base station according to the subscriber equipment feedback, and selected transmitting antenna information, every selected antenna is carried out the device that the adaptive modulation and coding mode is selected.
The present invention can further include:
The device that transmit power allocations and control are carried out to every selected antenna in the base station.
Wherein, the described channel status that is used to make user's device measuring down link also feeds back to the device of base station with corresponding channel condition information, can comprise:
Be used to make the device of subscriber equipment reception from the pilot frequency information of base station;
Be used to make user's device decodes pilot frequency information to obtain the device of the frequency pilot sign of every transmit antennas;
Be used to make this frequency pilot sign measurement of user's equipment utilization to estimate the device of the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Be used to make subscriber equipment to measure to estimate the SINR feedback information that obtains device to the base station.
Wherein, described channel quality information can be the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
The method and system that in multiuser mimo system, realize down link self adaption of the present invention, adaptive link thought is inserted (OFDMA) system from the multi-user orthogonal frequency division multiple access that single-input single-output system extends to multiple-input and multiple-output, the system that makes distributes best subcarrier and selects suitable transmitting antenna according to each user's self adaptation that is changed in the mimo system of channel condition, thereby can carry out the control of optimum bit and power, the further spectrum utilization efficiency and the channel capacity of raising system make full use of the resource of wireless system.
Description of drawings
Fig. 1 is the schematic diagram according to the described multiuser MIMO wireless communication system of embodiments of the invention;
Fig. 2 is the implementation method flow chart according to the down link self adaption in the described multi-user MIMO system of embodiments of the invention.
Embodiment
Fig. 1 has exemplarily illustrated the multi-user MIMO system that relates among the present invention, and " system " described in this embodiment comprises a base station and user's collection, and wherein the user concentrates and comprises user 1 again, and the user 2 ..., and user N.In base station configuration many antennas, also disposed many antennas at each user side.In order to schematically illustrate, the base station end shown in Fig. 1 has just been drawn out 3 antennas, and has just drawn 2 antennas at user side, and these antenna may be used to transmit and receive.By implementing embodiments of the invention, can pass through link adaptation techniques, make that each user in this system can both have only launch scenario.
Theoretical research shows, under Rayleigh (Rayleigh) fading channel environment, the information that mimo system can effectively utilize multipath produces independently in the space, and parallel channel transmits multiplex data stream simultaneously, so just improve the transmission rate of system effectively, promptly under the situation that does not increase system bandwidth, increased spectrum efficiency.But for the frequency selectivity deep fade, the MIMO technology still is helpless.The scheme that solves at present the frequency selective fading in the MIMO technology can be in conjunction with OFDM (OFDM) technology, and frequency selective fading is converted to flat fading on the subcarrier.OFDM can resist multipath transmisstion effectively, and the signal that is interfered can be received reliably.The OFDM code check is low, has added guardtime again at interval, has extremely strong anti-multipath interference performance.Its multidiameter delay is less than the protection interval, so system is not subjected to the puzzlement of intersymbol interference.
Yet for high-speed radiocommunication, the multipath fading in the simple ofdm system antagonism wireless environment is not enough, must combine with the MIMO technology, could bring into play its effect better.Wireless signal is propagated in the wireless channel of complexity and is produced Rayleigh decline, its fading characteristic difference on different spatial.If two location gap just think that greater than the correlation distance between the antenna (being separated by ten usually more than the signal wavelength) signal at two places is uncorrelated fully, so just can realize that signal space diversity receives.The MIMO technology is by the channel fading in the space diversity elimination wireless transmission.The key of MIMOOFDM technology is the multi-path influence factor that exists in the legacy communications system to be become the enhancing factor favourable to the telex network performance by space diversity.Simultaneously, the algorithm that in the MIMO ofdm system, the adds suitable Digital Signal Processing stability of enhanced system better.Simultaneously, OFDM suppresses and intelligent antenna technology in conjunction with space-time code, diversity, interference (comprising intersymbol interference ISI and monkey chatter ICI), can farthest improve the reliability of physical layer.If technology such as combining adaptive modulation again, adaptive coding and dynamic sub carrier distribution, dynamic bit allocation algorithm then can make its performance further optimize.
For multi-user's situation, also need to consider user's access problem.OFDM (OFDM) combines with frequency division multiple access (FDMA), has just constituted the OFDM-FDMA multiple access technique, also abbreviates it as OFDMA sometimes, also adopts the abbreviation form of this OFDMA in the present invention.OFDMA and traditional FDMA are very similar, it realizes that by the method for part available subcarrier is provided for each user the multi-user inserts, just each user distributes a subcarrier or the one group of subcarrier in the OFDM symbol, distinguishes the user with sub-carrier frequencies.Compare with traditional FDMA, the OFDMA access way need not adopt the protection frequency range to go to distinguish different users between each user's frequency, thereby has improved the frequency utilization efficient of system greatly.
In addition, in multiple-input and multiple-output (MIMO) system, base station and user side have all disposed many antennas, in the processing mode that adopts spatial reuse, each transmitting antenna and every reception antenna just can be corresponding and a channel, like this, in the mimo system operating process, because the characteristic changeable of wireless channel, make that each channel in the mimo system is not to obtain higher signal noise ratio (SNR), as D.A.Gore, as described in the paper that is entitled as " Selecting an Optimal Set of Transmit Antennas for a Low Rank MatrixChannel " that R.U.Nabar and A.Paulraj write, particularly when channel matrix is owed order, carry out emitting antenna selecting and often can obtain higher channel capacity, thereby make mimo system obtain higher spatial reuse gain, that is to say, in all transmitting antenna set, select a subclass to realize emission function.This paper is in 2785～2788 pages on the proceeding " In Proceedings of ICASSP, 2000 ".Certainly, at mimo system, according to the criterion difference that adopts, the method for day line options is also a lot.
Distribution through subcarrier makes each user obtain best transmission frequency, make each user obtain best transmit spatial channel by the sky line options, like this, just can adopt adaptive modulation and coding (AMC), for each user's configuration link parameter, can improve power system capacity to greatest extent.In the AMC system, the general user uses the modulation system of higher-order and higher code rate under desirable channel condition, and at the next modulation coding mode with lower-order of less-than-ideal channel condition.Separately encode by data flow for each transmit antennas, make the identical and data transfer rate difference of the transmitting power of every transmit antennas, and, receiver comprises a linear filter of MMSE when empty (this filter is followed by the Interference Cancellation symbol back based on back decoding), can reach the limit of Shannon (Shannon) capacity so in open loop MIMO.Mobile receiver is measured the Signal Interference and Noise Ratio (SINR) of every transmit antennas correspondence, and gives the base station with this SINR feedback information, and then, the base station determines the data transfer rate of every transmit antennas.
In mimo system, realize that at present AMC faces several challenges.At first, AMC is responsive to measure error and retardation ratio, for the modulation system of selecting to be fit to, must at first know quality of channel, mistake to channel estimating may make system select wrong transfer of data data transfer rate, make too high transmission power, waste power system capacity or occur the error rate because of power is too low and raise; Secondly, because the time-varying characteristics of mobile channel, the delay of channel measurement report has reduced the reliability of channel quality estimation; In addition, the variation of interference also increases the error of measurement.These problems can solve with combining of other technology by seeking, such as dynamic sub carrier distribute and technology such as day line options can reduce MCS require rank and to the sensitiveness of measure error and flowed fluctuation.
Fig. 2 is according to embodiments of the invention, realizes the flow chart of down link self adaption in multi-user MIMO system, and this flow chart inserts (OFDMA) mode according to OFDM and designs.This flow process comprises following step:
Step 201: the user measures the SINR of down link and SINR feedback information that will be wherein to the base station;
Step 202: the base station is distributed suitable subcarrier and is notified relative users with allocation result for each user;
Step 203: the user estimates the CQI of down channel correspondence and feeds back to the base station at institute's allocation of subcarriers;
Step 204: emitting antenna selecting is carried out according to CQI in the base station;
Step 205: the base station is according to the CQI of this user feedback, and selected transmitting antenna information, selected antenna is carried out the adaptive modulation and coding mode select;
Step 206: transmit power allocations and control are carried out for every selected antenna in the base station.
Above-mentioned each step closely links to each other, and at first each user measures the SINR of each transmit antennas correspondence according to the pilot frequency information that comes from the base station, and the SINR that measures is fed back to the base station by based on feedback link.The base station is distributed suitable subcarrier according to the SINR information of each user feedback for each user, and notifies corresponding user with the allocation result of subcarrier by the control link.The user according to the subcarrier assessment corresponding downstream channel quality (CQI) that distributes, feeds back to the base station by based on feedback link with corresponding CQI more then.The base station is according to the CQI information of each user feedback, select suitable transmitting antenna to relative users, modulate and coding mode selection according to corresponding C QI then, and selected transmitting antenna is carried out transmitting power control, thereby realize the self adaptation of down link according to certain criterion.
In multi-user MIMO system, each mobile subscriber has disposed many antennas, such as 2, has also disposed many antennas in the base station, such as 4.When setting up down link, the user at first receives the pilot frequency information from the base station, obtain the frequency pilot sign of every transmit antennas (in the base station) and estimate the forward direction SINR of every transmit antennas correspondence with its measurement by decoding, estimate separately that such as passing through of proposing of the Chinese patent application CN01818936.9 that adopts title for " a kind of SINR method of estimation and the device of realizing this method " power of interference power and estimative useful signal realizes that the method for estimating SINR estimates SINR, the SINR feedback information that measured estimation is obtained is to the base station then.Certainly, for the feedback of mimo system, present implementation is also a lot, has proposed a kind ofly to provide the speed of this substream of data or the gain designator mode as feedback by each the sub-stream for total data stream for the Chinese patent application CN01137687.2 of " having a plurality of feedback techinque of wireless system that transmit and receive antenna " such as title.The title of announcing in August, 2004 at 3GPP is among the technical report 3GPP TR 25.876 of " Multiple-InputMultiple Output in UTRA (v1.7.0) ", in S-PARC (the Selective Per Antenna Rate Control) technical scheme that the 5.2.7 chapters and sections are mentioned a kind of feedback format has been proposed therein, the selection of information such as CQI and adaptive modulation and coding mode is mapped as a form, thereby has realized feedback efficiently.
Should be noted that SINR information only is an embodiment of reflection down channel state, those skilled in the art should know the state that can also utilize other indexs to reflect down channel.
When the base station receive come from user feedback such as channel condition informations such as SINR after, just begin to distribute suitable subcarrier for this user according to the downlink channel condition information that SINR reflects at this user.
As everyone knows, a lot of subcarriers are arranged in ofdm system, and a plurality of users have been held in the whole system, these users have participated in the competition of whole bandwidth intermediate frequency spectrum resource, therefore, in order to make the spectrum efficiency maximum of system, guarantee the fairness between the user simultaneously, need come to be adaptively each user's allocation of subcarriers according to some criterions by the base station.Because have certain correlation between the OFDM subcarrier, and directly all subcarriers are dispatched, the feedback quantity of channel can be very big.Therefore, generally subcarrier is divided into some groups, also claims subband, what the user competed is these subbands, like this, reaches the compromise of performance and feedback quantity.The method that realizes this subcarrier allocation is also many, such as in the paper that is entitled as " Increase in Capacity of Multiuser OFDM SystemUsing Dynamic Subchannel Allocation " that W.Rhee and J.M.Cioffi write, this paper is published in IEEE VTC ' 2000 meetings of publication in 2000, has described a kind of single step subcarrier allocation algorithm; C.Y.Wong, R.S.Cheng and K.B.Letaief etc. write the paper that is entitled as " Multiuser OFDM with AdaptiveScucarrier; Bit and Power Allocation " in, this paper is published in periodical " IEEEJournal on Selected Areas of Communication ", Vol.17, No.10, in 1999 10 months, this paper has been described a kind of Lagrange relaxation subcarrier allocation algorithm; In the paper that is entitled as " An Efficient Multiuser Loading Algorithm for OFDM-BasedBroadband Wireless Systems " that H.Yin and H.Liu write, this paper is published in the IEEEGlobecom ' 2000 that publishes in 2000, San Francisco, in the USA meeting, a kind of two step allocation of carriers algorithms have been described; In the paper that is entitled as " FDMA Capacity of Gaussian MultipleAccess Channels with ISI " that Wei Yu and J.M.Cioffi write, this paper is published in periodical " IEEE Transaction onCommunication ", Vol.50, No.1, in 2002 1 month, this paper has been described a kind of dynamic sub carrier allocation algorithm of minimum subscriber channel maximum capacity, or the like.
It should be noted that, the base station is come the mode of allocation of subcarriers according to subscriber equipment feedback such as channel condition informations such as SINR, only be that the base station is a by way of example of each mobile subscriber's allocation of subcarriers, also have other modes, or even do not rely on the method for salary distribution of channel status, for example, in the Chinese patent application CN200410083762.9 that is entitled as " the wireless multicarrier transmission system sub-carriers is distributed and modulation scheme selection method " that announced on April 27th, 2005, a kind of subcarrier distribution scheme of practicality has been proposed, it divides the subcarrier that is used in transmission by the feedback information according to each user's channel transfer functions to the user of correspondence, according to a kind of frequency selection scheme a frequency oneself is distributed to relative users.
In fact, embodiments of the invention are described, the mode of subcarrier allocation is carried out according to the SINR information of the down link of being measured by the mobile subscriber in the base station, just in order to be each user's allocation of subcarriers more accurately.
Obtained the subcarrier allocation information that is used to transmit, the user just can estimate to feed back to the base station corresponding to the channel quality indication information such as (CQI) of this subcarrier information and with it, realizes the selection of downlink transmit antennas to be used for the base station.Because the channel condition information that the base station is the mode by user feedback obtains down link, therefore can the downlink service signal before, directly adopt several transmit antennas and adopt which root antenna to realize business information transmission for the specific user by the base station decision.
Should be noted that equally, CQI only is an embodiment of the channel condition information of down link, those skilled in the art should know the state that can also utilize other indexs to reflect down channel, and utilize the pairing channel status of this index to select transmitting antenna.
The base station is assessed the CQI of the corresponding downlink channel status correspondence of each user feedback, if can't satisfy minimum data rate request to such an extent as to the CQI of the fixed transmitting antenna correspondence of certain Gent is too low, this antenna will be not used in emission so.Its judgement is according to adopting such as D.A.Gore, the antenna selection mode of describing in the paper that is entitled as " Selecting an Optimal Set of Transmit Antennasfor a Low Rank Matrix Channel " that R.U.Nabar and A.Paulraj write based on system's heap(ed) capacity principle, this paper 2785～2788 pages on proceeding " In Proceedings of ICASSP; 2000 ", this thinking also has embodiment during being entitled as the Chinese patent application CN02822041.2 of the method for a plurality of days line options antenna subsets " in the diversity system from ", the essence of this method makes the channel capacity maximum of selected combination of antennas correspondence.Also can adopt describe in the paper " Antenna Selection for Spatial MultiplexingSystems with Linear Receivers " that R.W.Heath, Jr.S.Sandhu and A.J.Paulraj write based on the emitting antenna selecting method of maximum-minimum singular value with based on the emitting antenna selecting method of maximum-minimum detection output signal-to-noise ratio.
At each specific user, step through the front, carrying out when user's downlink business information sends, just having possessed reliable transmission frequency and suitable space channel (in mimo system by the base station, just be considered to a space channel between every transmit antennas and every reception antenna), like this, the base station just can be according to the requirement of user to quality of service, the emitting antenna selecting that each root is activated is modulated and coded system adaptively, preferably, and then carry out the control of power and speed, thereby set up adaptive down link.
The basic principle of adaptive modulation and coding is exactly to change the form of modulation and coding and it is adapted with channel condition in the system constraint scope, the control of it and antenna power all is that the wireless system field usually needs the technology considered, in many application, can find respective embodiments, for example in the Chinese patent application CN01142271 that is entitled as " based on the chain circuit self-adaptive method of adaptive coding and modulating and automatic repeat requests " of application on September 25 calendar year 2001, a kind of chain circuit self-adaptive method has just been described, this method is selected suitable chnnel coding modulation scheme and the maximum retransmission under this channel condition by the transmission conditions of determining down channel, carries out the transmission of packet then.These technology just no longer elaborate in the present invention.
Based on said process, realization extends to traditional adaptive link thought the multi-user ofdma system of multiple-input and multiple-output from single-input single-output system, make each user can obtain best subcarrier and corresponding space channel, make each user in down link, obtain best launch scenario, thereby improve the spectrum utilization efficiency and the channel capacity of system, make full use of the resource of wireless system.
Accordingly, the embodiment of the down link self adaption system in a kind of multiuser mimo system provided by the invention comprises:
Be used to make each subscriber equipment to measure the Signal Interference and Noise Ratio (SINR) of down link and with the device of corresponding SINR feedback information to the base station;
Be used to make the base station according to the SINR information that receives, give the suitable subcarrier of each user equipment allocation, and allocation result is notified the device of respective user equipment;
Be used to make each subscriber equipment to estimate down channel corresponding channel quality indication (CQI), and it is fed back to the device of base station according to the subcarrier that is distributed;
Be used to make the base station to carry out the device of corresponding emitting antenna selecting according to the CQI of each subscriber equipment feedback;
Be used to make the CQI of base station according to each subscriber equipment feedback, and selected transmitting antenna information, every selected antenna is carried out the device that the adaptive modulation and coding mode is selected;
Be used for the device that transmit power allocations and control are carried out to every selected antenna in the base station.
Wherein, describedly be used to make each subscriber equipment to measure the Signal Interference and Noise Ratio (SINR) of down link and, comprising with the device of corresponding SINR feedback information to the base station:
Be used to make the device of subscriber equipment reception from the pilot frequency information of base station;
Be used to make user's device decodes pilot frequency information to obtain the device of the frequency pilot sign of every transmit antennas;
Be used to make this frequency pilot sign measurement of user's equipment utilization to estimate the device of the forward direction SINR of every transmit antennas correspondence;
Be used to make subscriber equipment to measure to estimate the SINR feedback information that obtains device to the base station.
Certainly; embodiment indication provided by the invention illustrates the method that realizes down link self adaption in multi-user MIMO system that provides according to content of the present invention in order to think mostly; thereby all be exemplary execution mode; it can not be regarded as for restriction of the present invention; and every conspicuous modification within aim of the present invention is also due within protection scope of the present invention.
Claims (23)
1, a kind of method that realizes down link self adaption in multiuser mimo system is characterized in that, comprises the steps:
The user equipment allocation subcarrier is given in the base station, and notifies corresponding user equipment with allocation result;
Subscriber equipment is estimated the down channel corresponding channel quality according to the subcarrier that is distributed, and this channel quality information feedback is arrived the base station;
Corresponding transmitting antenna is selected according to the channel quality information of described subscriber equipment feedback in the base station;
The base station is according to described channel quality information, and selected transmitting antenna information, every selected antenna is carried out the adaptive modulation and coding mode select.
2, the method for claim 1 is characterized in that, further comprises step:
Transmit power allocations and control are carried out to every selected antenna in the base station.
3, the method for claim 1 is characterized in that, described base station is a user equipment allocation subcarrier step, is that the base station is distributed according to the downlink channel quality state of being measured by subscriber equipment.
4, the method for claim 1 is characterized in that, described base station is the user equipment allocation subcarrier, and notifies the corresponding user equipment step with allocation result, is to notify corresponding user by the control link.
5, the method for claim 1 is characterized in that, described base station is the user equipment allocation subcarrier, and notifies the corresponding user equipment step with allocation result, comprises the steps:
Subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station;
The user equipment allocation subcarrier is given according to the downlink channel status information that receives in the base station, and with the corresponding subscriber equipment of allocation result notice.
6, method as claimed in claim 5 is characterized in that, described subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station step, comprises the steps:
Subscriber equipment receives the pilot frequency information from the base station;
Subscriber equipment decoding pilot frequency information obtains the frequency pilot sign of every transmit antennas;
Subscriber equipment utilizes this frequency pilot sign measurement to estimate the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Subscriber equipment will be measured the SINR feedback information estimating to obtain to the base station.
7, the method for claim 1 is characterized in that, corresponding transmitting antenna step is selected according to the channel quality information of described subscriber equipment feedback in described base station, comprises the steps:
The down channel corresponding channel quality information of subscriber equipment feedback is assessed in the base station;
If this channel quality information is higher than predetermined threshold value, then the specific transmitting antenna of this channel quality information correspondence is selected for emission.
As claim 1 or 7 described methods, it is characterized in that 8, described channel quality information is the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
9, a kind of method that realizes down link self adaption in multiuser mimo system is characterized in that, comprises the steps:
Subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station;
The user equipment allocation subcarrier is given according to the downlink channel status information that receives in the base station, and with the corresponding subscriber equipment of allocation result notice;
Subscriber equipment is estimated the down channel corresponding channel quality according to the subcarrier that is distributed, and this channel quality information feedback is arrived the base station;
Corresponding emitting antenna selecting is carried out according to the channel quality information of subscriber equipment feedback in the base station;
The base station is according to the channel quality information of subscriber equipment feedback, and selected transmitting antenna information, every selected antenna is carried out the adaptive modulation and coding mode select.
10, method as claimed in claim 9 is characterized in that, further comprises step:
Transmit power allocations and control are carried out to every selected antenna in the base station.
11, method as claimed in claim 9 is characterized in that, described subscriber equipment is measured the channel status of down link and corresponding channel condition information is fed back to the base station step, comprises the steps:
Subscriber equipment receives the pilot frequency information from the base station;
Subscriber equipment decoding pilot frequency information obtains the frequency pilot sign of every transmit antennas;
Subscriber equipment utilizes this frequency pilot sign measurement to estimate the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Subscriber equipment will be measured the SINR feedback information estimating to obtain to the base station.
12, method as claimed in claim 9 is characterized in that, described channel quality information is the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
13, a kind of system that realizes down link self adaption in multiuser mimo system is characterized in that, comprising:
Be used to make the base station to give the user equipment allocation subcarrier, and allocation result notified the device of corresponding user equipment;
Be used to make subscriber equipment to estimate the down channel corresponding channel quality according to the subcarrier that is distributed, and with the device of this channel quality information feedback to the base station;
Be used to make the channel quality information of base station, select the device of corresponding transmitting antenna according to described subscriber equipment feedback;
Be used to make the base station according to described channel quality information, and selected transmitting antenna information, every selected antenna is carried out the device that the adaptive modulation and coding mode is selected.
14, system as claimed in claim 13 is characterized in that, further comprises:
Be used to the device that makes the base station carry out transmit power allocations and control to every selected antenna.
15, system as claimed in claim 13, it is characterized in that, describedly being used to make the base station to give the user equipment allocation subcarrier, and notifying the device of corresponding user equipment with allocation result, is that the base station is distributed according to the downlink channel quality state of being measured by subscriber equipment.
16, system as claimed in claim 13 is characterized in that, describedly is used to make the base station to give the user equipment allocation subcarrier, and notifies the device of corresponding user equipment with allocation result, comprising:
The device that is used to make the channel status of user's device measuring down link and corresponding channel condition information is fed back to the base station;
Be used to make the base station according to the downlink channel status information that receives, give the user equipment allocation subcarrier, and the device of the subscriber equipment that the allocation result notice is corresponding.
17, system as claimed in claim 16 is characterized in that, the described channel status that is used to make user's device measuring down link also feeds back to the device of base station with corresponding channel condition information, comprising:
Be used to make the device of subscriber equipment reception from the pilot frequency information of base station;
Be used to make user's device decodes pilot frequency information to obtain the device of the frequency pilot sign of every transmit antennas;
Be used to make this frequency pilot sign measurement of user's equipment utilization to estimate the device of the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Be used to make subscriber equipment to measure to estimate the SINR feedback information that obtains device to the base station.
18, system as claimed in claim 13 is characterized in that, the described channel quality information that is used to make the base station according to described subscriber equipment feedback is selected the device of corresponding transmitting antenna, comprising:
The device that is used to make the base station that the down channel corresponding channel quality information of subscriber equipment feedback is assessed;
Be used for when this channel quality information is higher than predetermined threshold value, make the specific transmitting antenna of this channel quality information correspondence be selected for the device of emission.
As claim 13 or 18 described systems, it is characterized in that 19, described channel quality information is the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
20, a kind of system that realizes down link self adaption in multiuser mimo system is characterized in that, comprising:
The device that is used to make the channel status of user's device measuring down link and corresponding channel condition information is fed back to the base station;
Be used to make the base station according to the downlink channel status information that receives, give the user equipment allocation subcarrier, and the device of the subscriber equipment that the allocation result notice is corresponding;
Be used to make subscriber equipment to estimate the down channel corresponding channel quality according to the subcarrier that is distributed, and with the device of this channel quality information feedback to the base station;
Be used to make the base station to carry out the device of corresponding emitting antenna selecting according to the channel quality information of subscriber equipment feedback;
Be used to make the channel quality information of base station according to the subscriber equipment feedback, and selected transmitting antenna information, every selected antenna is carried out the device that the adaptive modulation and coding mode is selected.
21, system as claimed in claim 20 is characterized in that, further comprises:
The device that transmit power allocations and control are carried out to every selected antenna in the base station.
22, system as claimed in claim 20 is characterized in that, the described channel status that is used to make user's device measuring down link also feeds back to the device of base station with corresponding channel condition information, comprising:
Be used to make the device of subscriber equipment reception from the pilot frequency information of base station;
Be used to make user's device decodes pilot frequency information to obtain the device of the frequency pilot sign of every transmit antennas;
Be used to make this frequency pilot sign measurement of user's equipment utilization to estimate the device of the forward signal interference-to-noise ratio SINR of every transmit antennas correspondence;
Be used to make subscriber equipment to measure to estimate the SINR feedback information that obtains device to the base station.
23, system as claimed in claim 20 is characterized in that, described channel quality information is the channel quality indicator (CQI) information corresponding to the subcarrier information of being distributed that subscriber equipment is estimated.
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| CNB2005101065733A CN100550685C (en) | 2005-10-05 | 2005-10-05 | The method and system of down link self adaption in the multiuser mimo system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101065733A CN100550685C (en) | 2005-10-05 | 2005-10-05 | The method and system of down link self adaption in the multiuser mimo system |
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| CN100550685C CN100550685C (en) | 2009-10-14 |
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