CN101686110A - Multi-input multi-output system, data transmission method and data transmission device thereof - Google Patents
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Abstract
The invention discloses a multi-input multi-output system, a data transmission method and a data transmission device thereof, which are used for improving the throughput of uplink data transmission inthe multi-input multi-output system. The method comprises that: a user terminal side performs corresponding modulation and coding on a data stream to be transmitted according to received modulation and coding scheme MCS information determined by a base station side, and inserts a user dedicated demodulation reference signal into each data stream to be transmitted respectively; downlink channel estimation is performed, and according to downlink channel information obtained by the estimation, eigenvalue decomposition is performed to obtain a corresponding pre-coding matrix which is used as an uplink pre-coding matrix; and the uplink pre-coding matrix is adopted to pre-code the data stream inserted with the user dedicated demodulation reference signal, and then the pre-coded data stream is transmitted to the base station side. The method and the device fully utilize uplink channel state information to obtain the spatial diversity gain of a plurality of antennae and improve the throughputof the uplink data transmission.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of multiple-input and multiple-output (Multiple InputMultiple Output, MIMO) method of system and transfer of data thereof and device.
Background technology
The MIMO technology all adopts many antennas to send reception at transmitting terminal and receiving terminal, thereby improves the transmission performance and the capacity of system greatly.The transmission diversity technique of MIMO is the data flow after transmitting terminal repeats to send the process precoding, thereby obtains diversity gain and coding gain; The space multiplexing technique of mimo system is to send several different data flow at transmitting terminal, thereby under the situation that does not increase bandwidth, improve capability of communication system and spectrum efficiency exponentially, really embodied the essence that the mimo system capacity improves, but it requires channel to be become the several separate parallel sub-channels by equivalence, thereby can not produce interference between data flow.
In uplink, in order to reach higher peak rate, original user terminal (UE) utilizes single antenna transmissions, can not satisfy the requirement of future communications development.Therefore, the Uplink MIMO technology is a kind of inevitable development, also is Long Term Evolution (Long-Term-Evolution, LTE) essential step that strides forward to advanced person's Long Term Evolution (LTE-Advanced).(Single-userMultiple Input Multiple Output, SU-MIMO) can there be closed loop and two kinds of patterns of open loop in system to the uplink single user multiple-input and multiple-output.Open loop SU-MIMO system does not need the feedback of channel information, comprises up transmission diversity, and technology such as up Open-Loop Spatial Multiplexing etc. are equivalent to the sending mode that pre-coding matrix is a unit matrix.Closed loop SU-MIMO pattern has made full use of the feedback of channel information, adjusts pre-coding matrix according to the channel information self adaptation, thereby obtains bigger power system capacity.
Open loop SU-MIMO pattern generally is used at a high speed down, and this moment is very fast owing to channel variation, the performance rapid deterioration of closed loop mode.When channel quality is bad, can obtain diversity gain with open loop transmit diversity, comprise space-time block code (Spatial and Time Block Code, STBC), space-time block code (Spatial andFrequency Block Code, SFBC), cyclic delay diversity (Circular Delay Diversity, mode such as CDD); When channel quality is better, can obtain space diversity gain with Open-Loop Spatial Multiplexing.Therefore closed loop mode generally is used for channel quality preferably than under the low velocity, and this moment, channel variation was unhappy, and feedback delay can not cause the deterioration of performance, utilizes channel information to carry out precoding and can reduce interference between a plurality of data flow, obtains very big spatial gain.
Adopt the code book form when at present, closed loop SU-mimo system carries out uplink.Its feature be pre-coding matrix by the base station according to uplink channel information, in the code book that a base station and terminal are all known, select code word wherein to obtain according to some criterion (such as capacity).(Precoding Matrix Index PMI) obtains the pre-coding matrix index that the used precoding of UE is notified by BS.
For open loop SU-MIMO pattern, owing to do not make full use of the channel information match channels, the throughput of system is lower; For the SU-MIMO pattern of closed loop code book form, owing to adopted codebook quantification, the throughput of system also can be affected.Simultaneously, the latter also can increase signaling consumption to UE notice PMI.
Summary of the invention
The method and the device that the purpose of this invention is to provide a kind of multi-input multi-output system and transfer of data thereof are in order in multi-input multi-output system, to improve the throughput of transmitting uplink data.
The method of a kind of multi-input multi-output system transmitting uplink data provided by the invention comprises:
Subscriber terminal side is carried out corresponding modulating-coding to the data flow that will send, and insert user's special demodulating reference signal respectively in each data flow that will send according to the determined modulation coding mode MCS of the base station side information of receiving;
Carry out down channel and estimate,, obtain corresponding pre-coding matrix according to estimating that the descending channel information that obtains carries out characteristic value decomposition, with this pre-coding matrix as up pre-coding matrix;
Utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out sending to base station side after the precoding.
Data transmission device in a kind of multi-input multi-output system provided by the invention comprises:
The modulating-coding unit is used for according to the determined modulation coding mode MCS of the base station side information of receiving the data flow that will send being carried out corresponding modulating-coding;
Reference signal is inserted the unit, is used for inserting user's special demodulating reference signal respectively in each data flow that will send;
The pre-coding matrix acquiring unit, the downlink reference signal that is used to utilize base station side to send carries out the down channel estimation, carry out characteristic value decomposition according to the descending channel information of estimating to obtain, obtain corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix;
Precoding unit is used to utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out precoding;
Transmitter unit is used for the data flow base station after the precoding is sent.
A kind of base station that the embodiment of the invention provides comprises:
Channel estimating unit is used for carrying out uplink channel estimation by the detection reference signal that user terminal sends;
The scheduling of resource unit is used to this user terminal to distribute the required physical resource of transmission next time;
MCS information determining unit estimates corresponding CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, and determines corresponding MCS information according to described CQI.
A kind of multi-input multi-output system provided by the invention comprises:
The base station is used for carrying out uplink channel estimation by the detection reference signal that user terminal sends, for this user terminal distributes the required physical resource of transmission next time; Estimate corresponding channel quality indication CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, and determine corresponding MCS information according to described CQI.
User terminal is used for the data flow that will send being carried out corresponding modulating-coding, and insert user's special demodulating reference signal respectively in each data flow that will send according to the determined modulation coding mode MCS of the base station side information of receiving; Utilization is carried out down channel and is estimated that the descending channel information obtain carries out characteristic value decomposition, obtains corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix; Utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out sending to the base station after the precoding.
In embodiments of the present invention, owing to utilized the symmetry of up-downgoing, obtain up pre-coding matrix, that is: end side utilizes descending channel information to obtain uplink channel information, utilize this uplink channel information that the upstream data that will send is carried out sending to base station side after the precoding, to make full use of the space diversity gain that the upper signal channel state information obtains many antennas, improved the throughput of transmitting uplink data, enlarged power system capacity.
And, because being the base station, MCS information estimates to obtain by detection reference signal, therefore, can on whole bandwidth, carry out rational scheduling of resource to UE, select suitable modulation coding mode for UE simultaneously.
In embodiments of the present invention, do not need base station side to send the PMI feedback, reduced signaling consumption to end side, and base station side does not need to know that pre-coding matrix can carry out demodulation to the upstream data that receives and detect yet when receiving upstream data, therefore, easy to detect.
Description of drawings
Fig. 1 realizes the method flow diagram of transfer of data in the multi-input multi-output system for the embodiment of the invention;
Fig. 2 is the structural representation of the data transmission device of the embodiment of the invention;
Fig. 3 is the SU-MIMO and the non-code book form SU-MIMO performance comparison schematic diagram of the code book form of prior art.
Embodiment
The embodiment of the invention is in the mimo system of up-downgoing symmetry, subscriber terminal side can be according to the determined modulation coding mode of the base station side of receiving (Modulation and coding Scheme, MCS) information, the data flow that will send is carried out corresponding modulating-coding, and in each data flow that will send, insert user's special demodulating reference signal respectively; Carry out characteristic value decomposition according to the descending channel information of estimating to obtain, obtain corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix; Utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out sending to base station side after the precoding.The applied mimo system of the present invention is the system of up-downgoing symmetry, therefore, can obtain corresponding pre-coding matrix according to estimating that the descending channel information that obtains carries out characteristic value decomposition, this pre-coding matrix is carried out precoding as up pre-coding matrix to the upstream data that will transmit.The mimo system of up-downgoing symmetry can be the TDD system.This mode does not need code book to quantize, and has well utilized the up-downgoing symmetry of channel simultaneously, thereby has improved up throughput of system.
Here, MCS information can be the MCS grade, or the sign of indication present encoding mode etc.
And, base station side can be carried out uplink channel estimation by detection (Sounding) reference signal that user terminal sends, for this user terminal distributes the required physical resource of transmission next time, and estimate corresponding CQI, and determine corresponding MCS information according to described CQI according to the uplink channel information of each physical resource.This mode can provide more suitably modulation coding mode of user terminal because the Sounding reference signal is carried out rational scheduling of resource to user terminal on whole bandwidth.
Referring to shown in Figure 1, the detailed process that the present invention carries out mimo system transmission upstream data is as follows:
Step 101: base station (BS) side is carried out uplink channel estimation by the Sounding reference signal that user terminal sends, be defined as this user terminal and distribute the required physical resource of transmission next time, and estimate CQI for this user terminal distributes the uplink channel information of the required physical resource of transmission next time according to described.
CQI that the utilization of step 102:BS side sets in advance and the corresponding relation of MCS are determined the pairing MCS information of the CQI that estimates.
Here, if in the TDD system, the concrete steps that estimate CQI according to the uplink channel information of each physical resource can realize like this: carry out matrix decomposition according to the uplink channel information of each physical resource and obtain pre-coding matrix, again according to this pre-coding matrix and uplink channel information, utilize the EESM mapping to calculate approximate Signal to Interference plus Noise Ratio (Signal Interference and Noise Rate, SINR), determine CQI according to this SINR again.
Step 103:BS side is by Physical Downlink Control Channel (Physical Downlink ControlChannel, PDCCH) informing user terminal MCS information.
Step 104: user terminal carries out corresponding modulating-coding according to the MCS information of receiving to the upstream data that will transmit.
Step 105: user terminal inserts user's special demodulating reference signal respectively according to certain pilot configuration in a plurality of data flow that will send.
Step 106: the descending channel information that obtains is carried out characteristic value decomposition obtain corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix, and after utilizing described up pre-coding matrix that the data of inserting reference signal are carried out precoding, go out from corresponding transmission antennas transmit.
For example: in the TDD system, because the up-downgoing symmetry of TDD system, can think that uplink channel information is approximately equal to descending channel information, therefore can directly use descending public reference signal to estimate to obtain descending channel information, then descending channel information is carried out characteristic value decomposition, thereby obtain up pre-coding matrix.
Need to prove that in embodiments of the present invention, the uplink channel information and the descending channel information of symmetry are at same Physical Resource Block.
Step 107:BS lateral root carries out channel estimating according to user's DRS (Dedicated Reference Signal), obtains the up channel of equivalence, is used for receiving detection to receiving upstream data.
Referring to shown in Figure 2, data transmission device in a kind of multi-input multi-output system of the embodiment of the invention comprises: modulating-coding unit 201, reference signal are inserted unit 202, pre-coding matrix acquiring unit 203, precoding unit 204 and transmitter unit 205.Wherein,
Modulating-coding unit 201 is used for according to the determined MCS information of receiving of base station side the data flow that will send being carried out corresponding modulating-coding;
Reference signal is inserted unit 202, is used for inserting user's special demodulating reference signal respectively in each data flow that will send;
Pre-coding matrix acquiring unit 203, the downlink reference signal that is used to utilize base station side to send carries out the down channel estimation, carry out characteristic value decomposition according to the descending channel information of estimating to obtain, obtain corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix;
Precoding unit 204 is used to utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out precoding;
Transmitter unit 205 is used for the data flow base station after the precoding is sent.
Data transmission device shown in Figure 2 can be used as logic device and is arranged in the user terminal, and also can be used as independently, physical entity exists.Below be that to be arranged in the user terminal as logic device with data transmission device be example, describe the multi-input multi-output system of the embodiment of the invention.
The multi-input multi-output system of the embodiment of the invention comprises: base station and user terminal.Wherein,
The base station is used for carrying out uplink channel estimation by the detection reference signal that user terminal sends, for this user terminal distributes the required physical resource of transmission next time; Estimate corresponding channel quality indication CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, and determine corresponding MCS information according to described CQI.
User terminal is used for the data flow that will send being carried out corresponding modulating-coding, and insert user's special demodulating reference signal respectively in each data flow that will send according to the determined modulation coding mode MCS of the base station side information of receiving; Utilization is carried out down channel and is estimated that the descending channel information obtain carries out characteristic value decomposition, obtains corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix; Utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out sending to the base station after the precoding.
Described base station, can be used for carrying out matrix decomposition and obtain pre-coding matrix according to the uplink channel information of each physical resource, according to this pre-coding matrix and uplink channel information, SINR is calculated in the effective wanted to interfering signal ratio mapping of utilization index EESM mapping, determines CQI according to this SINR again.
Described base station can also be further used for carrying out channel estimating according to user's special demodulating reference signal, obtains the uplink channel information of equivalence, and utilizes the uplink channel information of described equivalence that the data flow from described user terminal is received detection.
The base station of the embodiment of the invention can comprise: channel estimating unit, scheduling of resource unit and MCS information determining unit.Wherein, channel estimating unit is used for carrying out uplink channel estimation by the detection reference signal that user terminal sends; The scheduling of resource unit is used to this user terminal to distribute the required physical resource of transmission next time; MCS information determining unit estimates corresponding CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, and determines corresponding MCS information according to described CQI.
Described MCS information determining unit can comprise: pre-coding matrix determining unit and CQI determining unit.
The pre-coding matrix determining unit is used for obtaining pre-coding matrix according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time to carry out matrix decomposition; The CQI determining unit is used for according to this pre-coding matrix and uplink channel information, and Signal to Interference plus Noise Ratio SINR is calculated in the effective wanted to interfering signal ratio mapping of utilization index EESM mapping; Determine CQI according to this SINR.
This base station can further include: receive detecting unit, be used for carrying out channel estimating according to user's special demodulating reference signal, obtain the uplink channel information of equivalence, and utilize the uplink channel information of described equivalence that the data flow from described user terminal is received detection.
Fig. 3 is the SU-MIMO and the non-code book form SU-MIMO performance comparison schematic diagram of the code book form of emulation prior art.Referring to shown in Figure 3, the performance of code book and non-code book form SU-MIMO under the 2x2 antenna array TU channel comprises that desirable and true sounding estimates two kinds of situations.As can be seen from the figure, no matter be in the ideal case or under the true sounding estimation condition, the closed loop SU-MIMO of non-code book form has certain performance advantage.
The present invention has extensive applicability, is not only applicable to the SU-MIMO under 2 * 2, can also be used for any aerial array (such as the polarization battle array), the transfer of data under any MIMO antenna configurations, and the while also can comprise a kind of form of uplink beam figuration.
In embodiments of the present invention, at mimo system with up-downgoing symmetry, utilize the descending channel information similar to obtain up pre-coding matrix to uplink channel information, that is: end side utilizes descending channel information to obtain uplink channel information, utilize this uplink channel information that the upstream data that will send is carried out sending to base station side after the precoding, to make full use of the space diversity gain that the upper signal channel state information obtains many antennas, improve power system capacity greatly.
And, because being the base station, MCS information estimates to obtain by the sounding reference signal, therefore, can on whole bandwidth, carry out rational scheduling of resource to UE, select suitable modulation coding mode for UE simultaneously.
In embodiments of the present invention, do not need base station side to send the PMI feedback, reduced signaling consumption to end side, and base station side does not need to know that pre-coding matrix can carry out demodulation to the upstream data that receives and detect yet when receiving upstream data, therefore, easy to detect.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1, a kind of method of multi-input multi-output system transmitting uplink data is characterized in that, this method may further comprise the steps:
Subscriber terminal side is carried out corresponding modulating-coding to the data flow that will send, and insert user's special demodulating reference signal respectively in each data flow that will send according to the determined modulation coding mode MCS of the base station side information of receiving;
Carry out down channel and estimate,, obtain corresponding pre-coding matrix according to estimating that the descending channel information that obtains carries out characteristic value decomposition, with this pre-coding matrix as up pre-coding matrix;
Utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out sending to base station side after the precoding.
2, method according to claim 1 is characterized in that, described MCS information is that base station side is determined as follows:
Base station side is carried out uplink channel estimation by the detection reference signal that user terminal sends, for this user terminal distributes the required physical resource of transmission next time;
Base station side estimates corresponding channel quality indication CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, and determines corresponding MCS information according to described CQI.
3, method according to claim 2, it is characterized in that, when described multi-input multi-output system was TDD system, described base station side estimated corresponding CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, comprising:
For distributing the uplink channel information of the required physical resource of transmission next time to carry out matrix decomposition, this user terminal obtains pre-coding matrix according to described;
According to this pre-coding matrix and uplink channel information, Signal to Interference plus Noise Ratio SINR is calculated in the effective wanted to interfering signal ratio mapping of utilization index EESM mapping;
Determine CQI according to this SINR.
4, method according to claim 1 is characterized in that, described utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out precoding after after base station side sends, this method further comprises:
Base station side is carried out channel estimating according to user's special demodulating reference signal, obtains the uplink channel information of equivalence;
Utilize the uplink channel information of described equivalence that the data flow from described user terminal is received detection.
5, the data transmission device in a kind of multi-input multi-output system is characterized in that, this device comprises:
The modulating-coding unit is used for according to the determined modulation coding mode MCS of the base station side information of receiving the data flow that will send being carried out corresponding modulating-coding;
Reference signal is inserted the unit, is used for inserting user's special demodulating reference signal respectively in each data flow that will send;
The pre-coding matrix acquiring unit, the downlink reference signal that is used to utilize base station side to send carries out the down channel estimation, carry out characteristic value decomposition according to the descending channel information of estimating to obtain, obtain corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix;
Precoding unit is used to utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out precoding;
Transmitter unit is used for the data flow base station after the precoding is sent.
6, a kind of base station is characterized in that, this base station comprises:
Channel estimating unit is used for carrying out uplink channel estimation by the detection reference signal that user terminal sends;
The scheduling of resource unit is used to this user terminal to distribute the required physical resource of transmission next time;
MCS information determining unit estimates corresponding CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, and determines corresponding MCS information according to described CQI.
7, base station according to claim 6 is characterized in that, described MCS information determining unit comprises:
The pre-coding matrix determining unit is used for obtaining pre-coding matrix according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time to carry out matrix decomposition;
The CQI determining unit is used for according to this pre-coding matrix and uplink channel information, and Signal to Interference plus Noise Ratio SINR is calculated in the effective wanted to interfering signal ratio mapping of utilization index EESM mapping; Determine CQI according to this SINR.
8, base station according to claim 6 is characterized in that, this base station can further include:
Receive detecting unit, be used for carrying out channel estimating, obtain the uplink channel information of equivalence, and utilize the uplink channel information of described equivalence that the data flow from described user terminal is received detection according to user's special demodulating reference signal.
9, a kind of multi-input multi-output system is characterized in that, this system comprises:
The base station is used for carrying out uplink channel estimation by the detection reference signal that user terminal sends, for this user terminal distributes the required physical resource of transmission next time; Estimate corresponding channel quality indication CQI according to described for this user terminal distributes the uplink channel information of the required physical resource of transmission next time, and determine corresponding MCS information according to described CQI;
User terminal is used for the data flow that will send being carried out corresponding modulating-coding, and insert user's special demodulating reference signal respectively in each data flow that will send according to the determined modulation coding mode MCS of the base station side information of receiving; Utilization is carried out down channel and is estimated that the descending channel information obtain carries out characteristic value decomposition, obtains corresponding pre-coding matrix, with this pre-coding matrix as up pre-coding matrix; Utilize described up pre-coding matrix that the data flow of inserting user's special demodulating reference signal is carried out sending to the base station after the precoding.
10, system according to claim 9, it is characterized in that, described base station, be used for obtaining pre-coding matrix for this user terminal distributes the uplink channel information of the required physical resource of transmission next time to carry out matrix decomposition according to described, according to this pre-coding matrix and uplink channel information, Signal to Interference plus Noise Ratio SINR is calculated in the effective wanted to interfering signal ratio mapping of utilization index EESM mapping, determines CQI according to this SINR again.
11, system according to claim 9, it is characterized in that, described base station, also be further used for carrying out channel estimating according to user's special demodulating reference signal, obtain the uplink channel information of equivalence, and utilize the uplink channel information of described equivalence that the data flow from described user terminal is received detection.
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