CN104539332B - Method and apparatus for the precoding based on code book in mimo system - Google Patents
Method and apparatus for the precoding based on code book in mimo system Download PDFInfo
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- CN104539332B CN104539332B CN201510012893.6A CN201510012893A CN104539332B CN 104539332 B CN104539332 B CN 104539332B CN 201510012893 A CN201510012893 A CN 201510012893A CN 104539332 B CN104539332 B CN 104539332B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Radio Transmission System (AREA)
Abstract
The present invention relates to the methods and apparatus for the precoding based on code book in mimo system.A kind of method includes：The transmitting from four antennas of device is controlled using precoding codebook, the code book includes multiple entries, the wherein described entry so that single layer is mapped to the antenna of each selection, and the code-book entry includes different antenna to combination, thus selects one or two antenna to being used to emit.
Description
The application is divisional application, and the entitled of female case " is used for the precoding based on code book in mimo system
Method and apparatus ", the applying date are on March 17th, 2009, and application No. is 200980159347.8.
Technical field
The embodiment of the present invention is related to a kind of method and apparatus, specifically but not exclusively, is related to one kind and is used for
The device and method of multiple-input multiple-output radio communication network.
Background technology
Have proposed the coverage area and capacity that communication is improved by using space diversity or spatial reuse.By using sky
Between be multiplexed, by from different antennae but using according to frequency and time resource and the same channel that may be defined according to spreading code
Transmitting（transmit）Independent information stream can increase data rate.
These systems can be described as multiple-input and multiple-output (MIMO) system.These systems need complicated controller to be moved to control
Transmitting and the receiving element at dynamic station and base station.
The transmitting of multithread Single User MIMO has been suggested and has been formed WCDMA (wideband code division multiple access), (third generation closes 3GPP LTE
Make Partnership Program-long term evolution) and WiMax system standards a part.In single user multiple-input and multiple-output (SU-MIMO),
Multiple streams are received with the MIMO receiver of mutiple antennas and receiving circuit, detach multiple stream, and determine in spatial reuse
The transmitting symbol sent on each of data flow stream（transmission symbol）.
In 3GPP forums, LTE-Advanced has been proposed as the evolution of 8 systems of LTE Rel ' to solve IMT (states
Border mobile communication)-Advanced ITU-R (International Telecommunication Union's radio communication part) requirement.3GPP is in RAN#39 (2008
Year March) in have approved new study about LTE-Advanced.It has proposed：There is 2-4 hair at UE (user equipment)
The SU-MIMO for penetrating antenna will be a part of LTE-Advanced [36.913 v8.0.0 of TR].
It has proposed：SU-MIMO UL (uplink) transmittings will include transmitting precoding technique and this precoding uses
Fixed codebook.
In the submission data for presenting 3GPP in R1-090915, Ericsson proposes a kind of 4Tx (transmitting) precoding code
This, attempts advantageous PAPR (peak to average power ratio) property for keeping transmitting signal.However, the inventors discovered that：This is carried
Case is limited to order（rank）2 transmittings.
In the R1-090590 for presenting 3GPP, Texas Instruments explanations：In the big code book of full transmitting order
Set does not provide notable gain.
Antenna imbalance is had contemplated that in the codebook design proposed in the R1-062355 for presenting 3GPP by Nokia.So
And the inventors discovered that：These designs concentrate on 2Tx schemes.
The Householder code books increase PAPR used in 8 DL of LTE Rel ' (downlink), but the inventors discovered that：
This scheme does not consider that potential transmitting antenna is uneven (for example, caused by movement of the user equipment in user hand).
Invention content
According to an aspect of the invention, there is provided a kind of method, including：It is controlled from the four of device using precoding codebook
The transmitting of a antenna, the code book includes multiple entries, wherein the entry makes single layer be mapped to the antenna of each selection,
The code-book entry includes different antenna to combination, thus selects one or two antenna to being used to emit.
According to another aspect of the present invention, a kind of equipment is provided, including：Processor is configured so that precoding codebook
The transmitting from four antennas of device is controlled, the code book includes multiple entries, wherein the entry makes single layer be mapped to
The antenna each selected, the code-book entry include different antenna to combination, thus select one or two antenna to being used for
Transmitting.
According to another aspect of the present invention, a kind of equipment is provided, including：Processor, be configured to selection for control from
One of multiple entries in the precoding codebook of the transmitting of four antennas of device, wherein the entry makes single layer be mapped to
The antenna each selected, the code-book entry include different antenna to combination, thus one or two antenna to be configured to by
Selection is for emitting.
Description of the drawings
Various embodiments now with reference to attached drawing only as the example description present invention, wherein：
Fig. 1 shows the schematic diagram of the system including schematic base station and user equipment configuration, can realize the present invention wherein
Embodiment；
Fig. 2 displays embody code book-order 1 of the present invention；
Fig. 3 displays embody code book-order 2 of the present invention；
Fig. 4 displays embody code book-order 3 of the present invention；
Fig. 5 is shown in the flow chart of movement station steps taken；And
Fig. 6 is shown in the flow chart of base station steps taken.
Specific implementation mode
The embodiment of the present invention is described via specific examples and referring in particular to preferred embodiment in this paper.Art technology
Personnel are it should be understood that the present invention can be not limited to the details of specific embodiment given herein.
Fig. 1 shows the communication network 30 that can wherein realize some embodiments of the present invention.Particularly, some realities of the invention
Apply the realization for radio modulator/demodulator (modem) that example can relate to for a certain range of device, described device
It may include：User equipment 201, relay station, access point or the base station 101 communicated on wireless environment 151.
The embodiment of the present invention can be applied to what a certain range of standard and its evolution of the basis including the following terms were realized
Communication network：WCDMA (wideband code division multiple access), 3GPP LTE (long term evolution), WiMax (micro-wave access global inter communication), UMB
(Ultra-Mobile Broadband), CDMA (CDMA), 1xEV-DO (Evolution-Data optimization), WLAN (WLAN) and UWB (ultra-wide
Band) receiver.
Referring to Fig.1, display can wherein realize the schematic diagram of the system of the embodiment of the present invention.Communication system 30 is shown as having
Have a base station 101, base station 101 can be node B (NB), enhancement mode node B (eNB) or be suitble to enable user equipment 201 with
Any access server of wireless mode access communications system.
Fig. 1 shows such system, and by the system, base station (BS) 101 can be through wireless environment communication channel 151（It can
Referred to as downlink (DL)）Emit to user equipment (UE) 201, and user equipment (UE) 201 can communicate through wireless environment and believe
Road 151（It can be described as uplink (UL)）Emit to base station (BS) 101.
Base station 101 can include processor 105, and processor 105 can be configured to control and receive device/transmitter circuit 103
Operation.The processor can be configured to the software that operation is stored in memory 106.
Memory 106 can be additionally configured as the data and/or information that storage will emit and/or receive.Memory 106 can
It is additionally useful for storing the configuration parameter used by processor 105 when operating base station 101.
Receiver/transmitter circuit 103 can be configured as configurable receiver and/or transmitter, and described can configure connects
The radio frequency that device and/or transmitter are received in the specific protocol of the transmitting (or reception through wireless environment) on wireless environment is believed
It number is converted between baseband digital signal.Receiver/transmitter circuit 103 can be configured to use memory 106 as use
In the buffer for the data and/or information that will emit on wireless environment 151 or be received from wireless environment 151.
Receiver/transmitter circuit 103 can be additionally configured as being connected to for receiving and on wireless environment to user
At least one antenna of 201 transmitting radiofrequency signal of equipment.In Fig. 1, base station illustratively comprises 2 antennas, i.e. first antenna
1071With the second antenna 1072, the two antennas be all configured to emit and receive signal.In other embodiments of the invention, base
Standing can have by the dotted line antenna 107 in Fig. 1mThe more antennas represented.In a preferred embodiment, m can be 4.It needs
Four reception antennas are wanted to support order 4 to emit.
Base station 101 can be connected to other network elements through communication link 111.Communication link 111 can receive will be through downlink
The data that chain road direction user equipment 201 emits, and emit the data received from user equipment 201 through uplink.This data
It may include the data of all user equipments in the cell or range for wireless communication for being operated by base station 101.Communication link
111 are shown with wired link in Fig. 1.It should be appreciated, however, that the communication link can also be wireless communication link.
In Fig. 1, two user equipments 201 are shown in the range of base station 101.It should be appreciated, however, that in base station
There may be more or less user equipments 201 in the range of 101.User equipment can be movement station or suitable and base
Stand communication any other equipment or electronic device.For example, the present invention other embodiment in, user equipment can be
It is suitble to the personal data organizer or laptop computer of wireless communication in environment as described below.It should be understood that this hair
Bright embodiment can also be applied to relay station.
Fig. 1 shows in particular the first user equipment UE1 2011UE is equipped with second user2 2012.In addition, Fig. 1 is more detailed
Carefully show the first user equipment UE1 2011.First user equipment UE1 2011It may include being configured to control and receive device/transmitting
The processor 205 of the operation of device circuit 203.The processor can be configured to the software that operation is stored in memory 207.The processing
Device, which can also be controlled and be executed, needs any operation for being executed by user equipment, operation that such as user equipment is shown, audio and/
Or Video coding and decoding use to reduce spectrum.
Memory 207 can be additionally configured as the data and/or information that storage will emit and/or receive.Memory 207 can
Storage is additionally useful for when operation user equipment 2011When the configuration parameter that is used by processor 205.The memory can be solid-state
(such as floppy disk or hard disk drive for memory, optical memory (such as, for example, CD either DVD data format disk), magnetic memory
Dynamic device) either it is suitble to storage for any medium of program, configuration data or transmitting/reception data of operation processing device.
Receiver/transmitter circuit 203 can be configured as configurable receiver and/or transmitter, and described can configure connects
The radio frequency that device and/or transmitter are received in the specific protocol of the transmitting (or reception through wireless environment) on wireless environment is believed
It number is converted between baseband digital signal.Receiver/transmitter circuit 203 can be configured to use memory 207 as use
In the buffer for the data that will emit on wireless environment 151 or be received from wireless environment 151.
Receiver/transmitter circuit 203 is configured for connection to for receiving and on wireless environment to the transmitting of base station 101
At least one antenna of radiofrequency signal.In Fig. 1, user equipment illustratively comprises 4 antennas, i.e. first antenna 25111To the 4th
Antenna 25122。
Although Fig. 1 and example described below are described as user equipment and base station described below with being arranged to carry out
The processor of operation, it is to be understood that in an embodiment of the present invention, each processor may include single processor or multiple places
Manage device.These processors can be realized by one or more integrated circuits.
Some embodiments of the present invention can be used for can be used as the LTE-Advanced of a part of 3GPP LTE Rel. 10
In system.It should be appreciated, however, that agreement and base band number for the transmitting (or reception through wireless environment) on wireless environment
Word signal.Receiver/transmitter circuit 203 can be configured to use memory 207 as that will send out on wireless environment 151
The buffer of data penetrated or received from wireless environment 151.
Receiver/transmitter circuit 203 is configured for connection to for receiving and on wireless environment to the transmitting of base station 101
At least one antenna of radiofrequency signal.In Fig. 1, user equipment illustratively comprises 4 antennas, i.e. first antenna 25111To the 4th
Antenna 25122。
Although Fig. 1 and example described below are described as user equipment and base station described below with being arranged to carry out
The processor of operation, it is to be understood that in an embodiment of the present invention, each processor may include single processor or multiple places
Manage device.These processors can be realized by one or more integrated circuits.
Some embodiments of the present invention can be used for can be used as the LTE-Advanced of a part of 3GPP LTE Rel. 10
In system.It should be appreciated, however, that this is only example and the embodiment of the present invention can be used in alternative system.
Discuss that there is the precoding codebook for 4 Tx (transmitting) antenna to design is used for Single User MIMO (SU-MIMO)
PUSCH (physical uplink shared channel) pre-coding scheme.In another embodiment, these technologies can also apply to
PUCCH Format 2 (for example, with single stream precoding).Identical technology can be applied to value detects reference signal.
In some embodiments of the invention, SU-MIMO precoding codebooks are set as considering for LTE-Advanced systems
Specific character for the uplink of system.
Some embodiments are set as considering：
The imbalance between Tx antennas in the UE caused by the grasping of such as hand and the change of antenna orientation, this is vertical
Straight and horizontal polarization component provides different responses.
Since power efficiency caused by increased PAPR lowers.
In mimo systems, by the way that in the precoding of transmitter use space and after receiver use space, coding improves
The performance of radio system.Spatial pre-coding may include spatial beams formation and space encoding.Spatial pre-coding is executed to enhance
Destination signal power and reduce jamming power.
In single layer Wave beam forming, from every in the transmitting antenna with suitable phase (and optionally with gain)
A transmitting antenna emits same signal, is weighted so that making signal power maximize in receiver input.Wave beam forming
It has an advantage that and signal gain is increased by tectonic association and reduces multipath fading effect.When receiver has mutiple antennas, hair
Penetrating Wave beam forming cannot while be such that signal level maximizes at all reception antennas and uses precoding.Precoding needs
Channel state information (CSI) of the solution in transmitter.
Some embodiments of the present invention use the precoding codebook for emitting while up to 2 code words to design.At this
In a embodiment, code word can be considered as the transmission block for including the data using such as turbo codes coding.Below, art will be used
Language transmission block.Emit transmission block from 4 transmitting antennas.In some embodiments of the invention, based on one or more below
Criterion designs precoding codebook：
Precoding includes pre-coding matrix, the PAPR for keeping SC-FDMA (single-carrier frequency division multiple access) to emit.Therefore,
A layer is only mapped for each antenna.
Precoding considers that potential transmitting antenna is uneven by following one or more measures：
O includes antenna or Polarization selection in the code book emitted for order 1.
O is when emitting quantity of the order less than transmitting antenna, it is ensured that from the multiple days that can be selected according to current channel condition
Line emits each transmission block.
O includes to have day line options or the Tx diversity element of antenna grouping in the codebook to keep the size of code book minimum
Change.
Based on the criterion, the code book of specific order is designed for using following step：
For single stream transmitting：
Transmitting antenna is divided into two groups, wherein every group of 2 antennas.
Thereafter, all possible antenna is listed to map to antenna sets.
The out of phase rotation combination between the antenna in antenna sets is listed as code-book entry.
In addition, the selection of the individual antenna group for transmitting is included in code book.Including different antenna to antenna
Group option, and using phase place or transmitting Tx deversity schemes between the antenna in antenna sets.
Multithread is emitted：
The quantity of every layer of transmitting antenna is selected so that emitting each transmission block from mutiple antennas.
Thereafter, all possible layer is listed to antenna mapping (that is, forming the antenna sets for each layer) and is existed
Such constraint, i.e., each antenna only map a layer.
When layer is mapped to mutiple antennas (that is, antenna sets), the out of phase rotation between the antenna in antenna sets is listed
Turn combination and is used as code-book entry.
O on the other hand, can be between the antenna in antenna sets using transmitting Tx deversity schemes.
It should be noted that being kept comprising PAPR and the codebook design not contradiction of day line options preceding option.When UE is sent out
It penetrates and is kept precoding using PARP by when power limit, and can be used when UE emits not by power limit has day line options
The precoding of (and therefore, the power of remaining transmitting antenna improves).
Code book may be designed as keeping pre-coding matrix comprising PAPR.However, code book also can include not keep that PAPR's is pre-
Encoder matrix.
When observing specific codebook design, it should be appreciated that the embodiment of the present invention can be used together with transmitting order 1,2 with 3.
Order 4 is not considered below.It can provide order 4 code book using known technology.Order can be considered as the quantity of different transmitting streams.
In the case where pilot signal includes entry by typically precoding and code book（Wherein Tx deversity schemes need day
Line special pilot）, two pilot frequency sequences need to be assigned to UE.The second pilot frequency sequence is only used when using Tx diversity.
Order 1
Value in table represents amplitude and phase when layer X is mapped to antenna Y.
Antenna is divided into two groups, wherein every group of 2 antennas.Thereafter, the QPSK rotations between there is the antenna in antenna sets are formed
Turn the precoding vector of combination.In addition, including the precoding vector for antenna group selection.In the case of antenna group selection,
It can have the phase place (for example, BPSK (binary phase shift keying)) between transmitting antenna or there are simple Tx diversity
(for example, space-time block code STBC).It has an advantage that it allows the codebook design of more compact (smaller) using Tx diversity.If
Using BPSK, either then this codebook design leads to 22 or 16 pre-coding matrix indexes to STBC.The code book option obtained
Example show in fig. 2.Show three tables.First table is the table using STBC, and second table is the table using BPSK.
In third table, by considering space correlation (that is, polarization or position of antenna) design codebooks.In codebook design
In, precoding vector of the design with day line options element enables to selection with high spatial correlation (that is, identical
Polarization direction or adjacent antenna position) antenna.Therefore, in one embodiment of the invention, it is only possible to day line options
The subset of combination is included in code book.
In the illustrated example, using the 3-PSK rotations between the antenna of selection (in the PMI for providing day line options).
It should be noted that being rotated based on such as QPSK or 8-PSK, other phase rotated constellation figures can be also used
（constellation）.
In the alternative embodiment of the present invention, entry 11-16 (that is, antenna selection entry) is obtained from table 3, and
The Householder precoding vectors selection entry used from such as 8 DL 4Tx antenna codebooks of 3GPP LTE Release
1-10。
In row 1, precoding matrix indicators are listed.These indicators are from 1 to 22.It is every in four antennas of indicator pair
A antenna lists required rotation or Tx diversity.
The zero associated antenna of instruction is not used for emitting.On the contrary, (transmission power can be directed to UE and keep permanent transmission power
Concentrating on calmly) has the antenna of favorable channel.
In two tables, preceding 10 entries show that each antenna has the rotation of 0.5, -0.5,0.5j and -0.5j.
Phase place between these combination representative antennas pairings and antenna pair.For example, for table 1, under PMI 1-4 are represented
The antenna in face is grouped：No. 1 antenna sets include antenna 1 and 2, and No. 2 antenna sets include antenna 3 and 4, have QPSK rotations between the groups
Turn.Therefore, the phase having the same in these rows of antenna 3 and 4, because they belong to same antenna group.In PMI 5 to 8,
Antenna sets are antenna 1 and 3 and antenna 2 and 4 respectively.
As can be seen that antenna can be considered as two pairs, wherein each pair of be assigned identical rotation.(this is to be directed to preceding 10 items
Purpose situation).
For first table, the 11st to the 16th entry has STBC on two antennas among four antennas.Work as UE
In this way, it can have power headroom on power amplifier not in such as cell edge.It is then possible to preferably transmitting work(
Rate concentrates on good antenna.
In second table, there are 12 entries that only two antennas provide rotation.In this example, a rotation
Value always 0.5.In one embodiment, it is therefore intended that total transmission power is normalized to 1 (4 × 0.5^2=1).However, absolutely
Value is changeable.It in one embodiment, may be more important for the considerations of relationship of phase and amplitude.Another rotational value is -0.5
Or 0.5.
As an example, make SINR (signal and interference noise at the output of balanced device of the selection expectation in base station receiver
Than) maximized precoding vector.This can be estimated based on the existing channel estimation obtained from value detects reference signal.
As described above, the absolute value in table is changeable.In given precoding vector, amplitude can be directed to all antenna phases
Together, and when using only two emitting antennas among four transmitting antennas it can increase the amplitude, so that in two antennas
Rather than distribute identical power between four antennas.
Order 2
Antenna is divided into two groups, wherein every group of 2 antennas, wherein each antenna sets are mapped to a layer or data flow.Its
Afterwards, phase place (for example, BPSK (the binary phase shift keying)) combination between there is the antenna in each antenna sets is formed
Precoding vector.On the other hand, the Tx diversity being mapped between the antenna of same layer/antenna sets is can have (for example, the empty time-division
Group coding).According to BPSK is used, either this codebook designs of STBC lead to 12 or 3 pre-coding matrix indexes.It is obtained
Code book option is shown in figure 3.
It has an advantage that it allows the codebook design of more compact (smaller) using Tx diversity.
First table of Fig. 3 is BPSK codebook designs and second table is STBC codebook designs.As Fig. 2, first
Row represent precoding matrix indicators.Secondary series marker antenna is numbered.Third row represent the row of layer 1 and the 4th and represent layer 2.It can be with
Find out, two antennas among four antennas are assigned to each layer in two layers.Different precoding matrix indicators tools
Have in first to fourth antenna for distributing to each data flow or layer of first and second data flows either in layer not on the same day
Line.
The value that each antenna is distributed in first table is 0.5 and -0.5.Using BPSK elements and two layers, there are 12
A option.In some embodiments of the invention, there need not be the phase place being mapped between the antenna of different layers.
Value in table is related to the phase place used；Herein, using BPSK planispheres (so that codebook size keeps closing
Reason).On the other hand, QPSK planispheres can be used together with may also include 0.5j with the relating value in the table of -0.5j.
In second table, three options are provided, wherein to the different antennae quilt in each antenna applications STBC but antenna
Distribute to each layer.
Order 3
When taking the transmission block of 8 DL of LTE Rel ' to be mapped to layer, transmission block #1 is mapped to a layer #1, transmission block #2 mappings
To layer #2 ＆ #3.In order to ensure emitting each transmission block from mutiple antennas, layer #1 is mapped to 2 antennas and each of layer #2 and 3
It is mapped to individual antenna.Therefore, each code word or transmission block are mapped to 2 transmitting antennas.Precoding codebook includes 6 kinds of differences
Layer to antenna mapping and between the antenna used by layer #1 using BPSK rotations or Tx diversity (for example, STBC).Root
According to BPSK is used, either this codebook designs of STBC lead to 12 or 6 pre-coding matrix indexes.The code book option obtained is aobvious
Show in figure 3.
In Fig. 4, first table application BPSK rotation and second table application STBC.First row is PMI and second
List antenna number.Subsequent row are for first to third layer.In each table, layer 1, which has, distributes to its two days
Line, and layer 2 and each of 3 has and distributes to their individual antenna.Which antenna last row indicate.
It, being capable of apportioning cost 0.5 and -0.5 in first table.In second table, STBC or value 0.5 can be applied.
In order 3, layer 1 uses two antennas.Due to emitting identical data from two antennas, so being answered on the antenna for being mapped to layer 1
Use STBC.However, each of layer 2 and 3 use individual antenna, and therefore, different data is sent from these antenna.Therefore, it does not answer
Use STBC.
Some embodiments of the present invention can have the advantages that below one or more：
Keep the single-carrier nature for being suitble to LTE-Advanced UL.
Codebook size can keep very little, it means that there are small signaling overheadss in DL.
Antenna pair helps that codebook size is made to keep very little.Antenna pair reduces the number of the combination for phase place
Amount.In addition, by limiting antenna to comprising with notable space correlation (for example, identical polarization direction or adjacent antenna position)
Antenna, code book can keep very little.Finally there are the uses to transmitting diversity, this helps that code book is made to keep very little again.
With reference to Fig. 5, Fig. 5 displays embody the flow chart of the present invention.This is executed by user equipment.In addition, execution level maps
(that is, how transmission block (code word) is mapped to space layer).Corresponding to the layer demapping in base station, this behaviour can be executed in UE
Make.
In S1, receives code book or identify the information of code book.Also receive the information of one of entry of identification code book.
In S2, the information of reception is stored in memory 207.
In S3, according to the information pair of the entry of selection（It is multiple）Data flow carries out precoding.The data flow of precoding with
Emitted afterwards by each antenna.If it is required, then the precoding of selection can be used in what necessary repeating transmission in office.
In terms of this, shown the step of being executed by base station with reference to Fig. 6, Fig. 6.
In T1, base station is set as determining channel conditions.Preferably, instantaneous channel conditions are determined.Channel is user equipment
Channel between base station.
Determine the order-T2 of communication.It in other words, it is determined the quantity for the data flow to emit simultaneously.In the implementation of discussion
In example, the quantity of data flow can up to m, wherein m is the quantity of antenna possessed by UE.
In next step T3, base station is selected code book based on order and is selected based on the property of channel conditions and/or data flow
Code-book entry.It is preferably based on instantaneous channel conditions selection code-book entry.
In T4, the code-book entry and code book of selection are sent to user equipment.It on the other hand, can be with code-book entry
Send the information of identification code book.
In the alternative embodiment of the present invention, in receiver-side, for example, the feelings not being pre-coded in demodulation reference signal
Under condition, the processor 105 of BTS receivers needs pre-coding matrix and channel estimation calculation efficient channel by combining selection.
The embodiment of the present invention can be used less than four antennas or more than four antennas.
Although should be noted that has combined user equipment or mobile device (such as, mobile terminal) to describe implementation
Example, but the equipment that the embodiment of the present invention can be applied to any other suitable type for being suitble to communicate through access system.Mobile dress
It sets and can be configured to for example to use different access technologies based on suitable multi radio realization method.
Although being also to be noted that above with reference to the exemplary architecture conduct of certain mobile networks and WLAN
Example describes some embodiments, but embodiment can be applied to it is any in addition to those of indicating and describing herein communication system
The communication system of other suitable forms.It is also to be noted that term access system can be regarded as indicating to be configured to visit
Ask that the user of application realizes any access system of wireless communication.
Aforesaid operations can need the data processing in a variety of entities.Data can be provided by one or more data processors
Processing.Similarly, a variety of entities described in above example can be realized in single or multiple data processing entities and/or data
In processor.The computer program code products suitably used can be used for realizing embodiment when being loaded into computer.For
The program code product for providing operation is storable on mounting medium (such as, carrier plate, card and band) and is carried by the mounting medium
For.It can be through data network download program code product.Realization can be provided using the appropriate software in server.
For example, the embodiment of the present invention can be realized as chipset, in other words, it can be achieved that a system to communicate each other
Row integrated circuit.Chipset may include microprocessor, the application-specific integrated circuit for running code for executing aforesaid operations
(ASIC) or programmable digital signal processor.
The embodiment of the present invention may be implemented in a variety of components, such as integrated circuit modules.The design of integrated circuit can be
Generally highly automated process.Complicated and powerful software tool can be used for electrical logic design to be converted into being easy half
The semiconductor circuit design for etching and being formed in conductor substrate.
Program (such as, by Mountain View, Synopsys, Inc and the San Jose of California,
The program that the Cadence Design of California are provided) perfect design rule and pre-stored design module can be used
Library self routing and positioning element on a semiconductor die.Once the design of semiconductor circuit may be completed, obtained
Design with standardized electronic format (for example, Opus, GDSII etc.) can be sent to semiconductor machining mechanism or " micro- core
Piece factory " is to be processed.
It is noted herein that although the foregoing describe exemplary embodiment of the present invention, appended power is not being departed from
In the case of the scope of the present invention defined in profit requirement, there are several variations that can be made to disclosed solution and repair
Change.
Claims (4)
1. a kind of method for emitting data flow from user equipment, the user equipment includes four antennas, thus selects one
A or two antennas the described method comprises the following steps to being used to emit：
The information of the entry of identification precoding codebook is received to control the transmitting from four antennas, the code book includes
Multiple entries, wherein the entry makes single layer be mapped to the antenna of each selection, the entry includes four antennas
Different antennas to combination, wherein multiple in the multiple entry of the code book are set as being used only described in a pair
Antenna；
Precoding is carried out to the data flow according to the entry；And
By one or two antennas to emitting the data flow of precoding.
2. a kind of user equipment is configured to transmitting data flow, including：
Thus one or two antenna may be selected to being used to emit in-four antennas；
Reception device is configured to receive the information of the entry of identification precoding codebook to control from four antennas
Transmitting, the code book includes multiple entries, wherein the entry makes single layer be mapped to the antenna of each selection, the entry
Different antennas including four antennas are to combination, wherein by multiple settings in the multiple entry of the code book
For a pair of antenna is used only；
Pre-coding apparatus is configured to carry out precoding to the data flow according to the entry；And
Emitter is configured to by one or two antennas to emitting the data flow of precoding.
3. the quantity of user equipment according to claim 2, the antenna for being further configured to according to while emitting controls day
The power of line transmitting.
4. according to the user equipment described in one of claim 2 and 3, control is further configured to from mutiple antennas transmitting at least one
A transmission block.
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| CN200980159347.8A CN102428658B (en) | 2009-03-17 | 2009-03-17 | Method and apparatus for codebook-based precoding in MIMO systems |
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| US10523290B2 (en) * | 2017-09-12 | 2019-12-31 | Mediatek Inc. | Codebook-based uplink transmission in wireless communications |
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| WO2008085107A2 (en) * | 2007-01-12 | 2008-07-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for precoding using a block diagonal matrix |
| WO2008086239A1 (en) * | 2007-01-04 | 2008-07-17 | Texas Instruments Incorporated | Precoding codebook for mimo systems |
| WO2008133582A2 (en) * | 2007-04-30 | 2008-11-06 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for adapting a multi-antenna transmission |
| CN102428658B (en) * | 2009-03-17 | 2015-02-18 | 诺基亚通信公司 | Method and apparatus for codebook-based precoding in MIMO systems |
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| US8064394B2 (en) * | 2007-02-14 | 2011-11-22 | Telefonaktiebolaget L M Ericsson | Methods and systems for codeword to layer mapping |
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| WO2008086239A1 (en) * | 2007-01-04 | 2008-07-17 | Texas Instruments Incorporated | Precoding codebook for mimo systems |
| WO2008085107A2 (en) * | 2007-01-12 | 2008-07-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for precoding using a block diagonal matrix |
| WO2008133582A2 (en) * | 2007-04-30 | 2008-11-06 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for adapting a multi-antenna transmission |
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