CN102255691B - A kind of launching technique and device of uplink multiaerial system Open-Loop Spatial Multiplexing - Google Patents
A kind of launching technique and device of uplink multiaerial system Open-Loop Spatial Multiplexing Download PDFInfo
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Abstract
The invention discloses a kind of launching techniques of uplink multiaerial system Open-Loop Spatial Multiplexing, user equipment (UE) is when emitting the information of each code word in multi-antenna port, transfer pre-coding treated information will be passed through and carry out open-loop precoding processing, open-loop precoding treated information is subjected to frequency-region signal processing, and treated that information transforms to time domain emits by frequency-region signal；The present invention also discloses a kind of emitters of uplink multiaerial system Open-Loop Spatial Multiplexing.Scheme through the invention can improve the transmission performance of UE under uplink multiaerial system.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for transmitting open-loop spatial multiplexing for an uplink multi-antenna system.
Background
In wireless communication, if multiple antennas are used for transceiving at both the transmitting end and the receiving end, a higher data rate can be obtained by using a spatial multiplexing technique, that is: the sending end sends a plurality of data streams by using the same time-frequency resource, and the receiving end can obtain a channel coefficient matrix through channel estimation and further demodulate data on each data stream.
The spatial multiplexing mode includes an Open-loop spatial multiplexing (Open-loop spatial multiplexing) mode and a closed-loop spatial multiplexing (Close-loop spatial multiplexing). The closed-loop spatial multiplexing refers to performing precoding processing on a signal at a transmitting end according to Channel State Information (CSI), and fig. 1 is a schematic structural diagram of a closed-loop spatial multiplexing Multiple Input Multiple Output (MIMO) antenna system, including: the system comprises a pre-coding pre-processing module, a pre-coding module and a pre-coding post-processing module of a sending end, and a multi-antenna processing module, a receiving processing module, a codebook selecting module and a feedback channel of a receiving end; the codebook selection module of the receiving end informs the index value of the used precoding codebook matrix to the precoding module of the sending end through a feedback channel, the precoding pre-processing module of the sending end encodes, modulates, maps layers and the like the transmitted information, then the information is transmitted in the MIMO antenna through the precoding module and the precoding post-processing module, and the receiving end decodes and demodulates the received information through the multi-antenna processing module and the receiving processing module. In fig. 1, a sending end needs to perform precoding processing on information based on CSI, and one of ways for the sending end to obtain CSI is through feedback of a receiving end. In order to reduce the overhead of feedback, a common method is to store the same codebook (codebook), i.e. a precoding matrix set, at the receiving end and the transmitting end. The receiving end selects a proper precoding matrix in the codebook according to the current channel condition, and feeds back a Precoding Matrix Index (PMI) of the precoding matrix in the set to the sending end, and the sending end finds the precoding matrix according to the fed-back PMI and precodes the sending signal. The open-loop spatial multiplexing refers to that a sending end does not perform precoding processing on signals according to channel state information sent by a receiving end, but performs precoding processing on the signals according to a predetermined fixed codebook combination.
In a Long Term Evolution (LTE) system, a downlink physical shared channel (PDSCH) supports transmission in an open-loop spatial multiplexing mode, and fig. 2 shows a PDSCH transmission process in the LTE system, which includes: processes of scrambling, modulating, layer mapping, precoding, Resource Element (RE) mapping, generating an Orthogonal Frequency Division Multiplexing (OFDM) signal, and the like are performed on the transmitted information, wherein a manner of layer mapping is shown in table 1:
TABLE 1
Wherein,indicating the number of modulation symbols corresponding to the jth codeword,the number of modulation symbols corresponding to the upsilon layer is shown.
For open-loop spatial multiplexing, the precoding process is shown in equation (1):
wherein the precoding matrix W (i) is a matrix P x upsilon, the values of D (i) and U are shown in Table 2; the precoding matrix is selected from precoding codebooks configured by a base station (eNB, eNode B) and a User Equipment (UE), and W (i) ═ C for 2-antenna ports1In which C is1Representing a precoding matrix corresponding to a codeword index of 0 in table 3; for 4 antenna ports, the UE assumes that the base stations are in different vectors [ x ](0)(i)...x(υ-1)(i)]TThe upper loop uses different precoding matrices, each upsilon vector uses a different precoding matrix, i.e., w (i) ═ CkWhereinC1、C2、C3、C4Respectively represent the code word index in Table 4Leading to precoding matrixes corresponding to 12, 13, 14 and 15;
TABLE 2
TABLE 3
TABLE 4
In a next generation evolution (LTE-a, LTE-Advanced) system of the LTE system, in order to obtain a higher data rate, a Single User spatial multiplexing (SU-MIMO) technology is introduced in uplink, and fig. 3 shows a PUSCH transmission process in the LTE-a system, including: scrambling, modulating, layer mapping, transmission precoding, RE mapping, generating SC-FDMA signal and the like are carried out on the transmitted information. The mode of mapping the layers in SU-MIMO mode is shown in table 5:
TABLE 5
Wherein,indicating the number of modulation symbols corresponding to the jth codeword,the number of modulation symbols corresponding to the upsilon layer is shown.
As shown in tables 6, 7, 8, 9, and 10, the LTE-a system further defines a precoding codebook used for SU-MIMO, where table 6 represents a precoding codebook used for 2-antenna port transmission, table 7 represents a precoding codebook used for 4-antenna port transmission with υ being 1, table 84 represents a precoding codebook used for antenna port transmission with υ being 2, table 9 represents a precoding codebook used for 4-antenna port transmission with υ being 3, and table 10 represents a precoding codebook used for 4-antenna port transmission with υ being 4.
TABLE 6
TABLE 7
TABLE 8
TABLE 9
Watch 10
In the LTE-a system, an uplink scheduling grant signaling for scheduling PUSCH transmission in SU-MIMO mode is added, and the uplink scheduling grant signaling is sent to the scheduled UE by a Physical Downlink Control Channel (PDCCH) having a Downlink Control Information (DCI) format 4(format 4). There are 3 bits (corresponding to 2 antenna ports) or 6 bits (corresponding to 4 antenna ports) in the DCI format 4 for indicating precoding index information used for spatial multiplexing, which is called precoding and number of layers information (Pre-coding information and number of layers).
In order to ensure the transmission performance of a user with higher moving speed, an LTE-A system introduces uplink open-loop spatial multiplexing, and the open-loop spatial multiplexing is specified in the prior art to support the transmission of 2 layers at most; the existing uplink open-loop spatial multiplexing scheme is as follows: in consideration of uplink single carrier characteristics, when precoding operation is carried out on information after layer mapping, different precoding code words are only used in a circulating mode by taking symbols or time slots as units, and by adopting the open-loop spatial multiplexing transmission method, the obtained frequency diversity gain is limited, and the improvement on the transmission performance of UE (user equipment) under a multi-antenna system is limited.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for transmitting open-loop spatial multiplexing in an uplink multi-antenna system, so as to improve the transmission performance of a UE in the uplink multi-antenna system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a transmitting method for open-loop spatial multiplexing of an uplink multi-antenna system, which comprises the following steps:
when the UE transmits the information of each code word on a multi-antenna port, carrying out open-loop precoding processing on the information subjected to the transmission precoding processing;
and carrying out frequency domain signal processing on the information subjected to the open-loop precoding processing, and converting the information subjected to the frequency domain signal processing into a time domain for transmitting.
In the foregoing solution, the open-loop precoding processing includes: layer interleaving and precoding processing; or precoding processing and cyclic delay processing; or layer interleaving, precoding processing, and cyclic delay processing.
In the above scheme, the precoding processing is precoding processing that cyclically uses different precoding codewords in units of symbols or time slots; or precoding processing for cyclically using different precoding codewords in units of subcarriers, subcarrier groups, or subbands.
In the above scheme, the open-loop precoding processing is precoding processing that cyclically uses different precoding codewords in units of subcarriers.
In the foregoing solution, before performing the open-loop precoding processing, the method further includes: and the UE performs transmission precoding processing on the information on each layer after layer mapping.
In the foregoing solution, before performing the transmission precoding processing, the method further includes: the UE scrambles the information of each code word transmitted on the multi-antenna port; modulating the scrambled information; and performs layer mapping on the modulated information.
The invention provides a transmitting device for open-loop spatial multiplexing of an uplink multi-antenna system, which comprises: the system comprises an open-loop pre-coding processing module, a frequency domain signal processing module and an information transmitting module; wherein,
the open-loop pre-coding processing module is used for carrying out open-loop pre-coding processing on the information subjected to the transmission pre-coding processing when the information of each code word is transmitted on the multi-antenna port, and sending the information subjected to the open-loop pre-coding processing to the frequency domain signal processing module;
the frequency domain signal processing module is used for carrying out frequency domain signal processing on the information subjected to the open-loop pre-coding processing and sending the information subjected to the frequency domain signal processing to the information transmitting module;
and the information transmitting module is used for converting the information after the frequency domain signal processing into a time domain for transmitting.
In the foregoing solution, the open-loop precoding processing includes: layer interleaving and precoding processing; or precoding processing and cyclic delay processing; or layer interleaving, precoding processing, and cyclic delay processing.
In the above scheme, the open-loop precoding processing is precoding processing that cyclically uses different precoding codewords in units of subcarriers.
In the above scheme, the apparatus further comprises a scrambling module, a modulation module, a layer mapping module and a transmission precoding processing module; wherein,
a scrambling module, configured to scramble information of each codeword when the information of each codeword is transmitted on a multi-antenna port;
the modulation module is used for modulating the scrambled information;
the layer mapping module is used for carrying out layer mapping on the modulated information;
and the transmission precoding processing module is used for carrying out transmission precoding processing on the information on each layer after the layer mapping.
The invention provides a transmitting method and a device for multiplexing an open-loop space of an uplink multi-antenna system.A UE performs open-loop pre-coding processing on information after transmission pre-coding processing when transmitting information of each code word on a multi-antenna port, performs frequency domain signal processing on the information after the open-loop pre-coding processing, and converts the information after the frequency domain signal processing to a time domain for transmitting; therefore, the scheme of the invention can improve the transmission performance of the UE under the uplink multi-antenna system.
Drawings
Fig. 1 is a schematic structural diagram of a closed-loop spatial multiplexing multi-antenna system in the prior art;
fig. 2 is a schematic diagram of a PDSCH transmission process in an LTE system in the prior art;
fig. 3 is a schematic diagram illustrating a PUSCH transmission process in an LTE-a system in the prior art;
fig. 4 is a schematic flow chart of a transmitting method for implementing open-loop spatial multiplexing of an uplink multi-antenna system according to the present invention;
fig. 5 is a schematic structural diagram of a transmitting apparatus for implementing open-loop spatial multiplexing of an uplink multi-antenna system according to the present invention.
Detailed Description
The basic idea of the invention is: when the UE transmits the information of each code word on the multi-antenna port, the information after transmission pre-coding processing is subjected to open-loop pre-coding processing, the information after the open-loop pre-coding processing is subjected to frequency domain signal processing, and the information after the frequency domain signal processing is converted to a time domain for transmission.
The invention is further described in detail below with reference to the figures and the specific embodiments.
The invention realizes a transmitting method of open-loop spatial multiplexing of an uplink multi-antenna system, as shown in figure 4, the method comprises the following steps:
step 101: when the UE transmits the information of each code word on the multi-antenna port, scrambling the information of each code word;
specifically, when the UE transmits the information of each codeword on the multi-antenna port, the UE transmits the information of each codewordIs subjected to scrambling to obtainWherein q represents the q-th codeword,representing the number of bits of information transmitted by the qth code word; the specific implementation of said scrambling belongs to the prior art,and will not be described in detail herein.
Step 102: the UE modulates the scrambled information;
specifically, the UE scrambles the information according to the modulation orderIs subjected to modulation to obtainWhereinRepresenting the number of modulation symbols transmitted by the q code word; the UE obtains the modulation order of each code word according to the uplink scheduling authorization signaling; the specific implementation of the modulation belongs to the prior art and is not described in detail here.
Step 103: the UE carries out layer mapping on the modulated information;
specifically, the UE modulates the information according to the layer number informationPerforming layer mapping, wherein information x (i) mapped to each layer is x (i) ═ x(0)(i)...x(υ-1)(i)]T(ii) a Wherein, the UE obtains the layer number information according to the uplink scheduling authorization signaling,v represents the number of layers,representing the number of modulation symbols on each layer; the specific implementation of the layer mapping belongs to the prior art, and is not described herein again.
Step 104: the UE carries out transmission precoding processing on the information on each layer after layer mapping;
specifically, the UE maps information x (i) ═ x on each layer after the layer mapping(0)(i)...x(υ-1)(i)]TPerforming transmission precoding processing, wherein the information y (i) after the transmission precoding processing is y (i) [ < y >(0)(i)...y(υ-1)(i)]TWhereinV represents the number of layers,representing the number of modulation symbols on each layer; the specific implementation of the transmission precoding processing belongs to the prior art, and is not described herein again.
Step 105: the UE carries out open-loop precoding processing on the information after the transmission precoding processing;
specifically, the UE determines y (i) ═ y of information subjected to transmission precoding processing on each layer(0)(i)...y(υ-1)(i)]TPerforming open-loop precoding to obtain information z (i) transmitted by each antenna, wherein z (i) is ═ z(0)(i)...z(P-1)(i)]TWhere i is the index of the modulation symbol, representing the number of modulation symbols on each layer, and p represents the number of layers;
the open-loop precoding process may include:
layer interleaving and precoding processing, namely:
or precoding processing and cyclic delay processing, namely:
or layer interleaving, precoding processing, and cyclic delay processing, i.e.:
where l and q represent the index of a subcarrier, a group of subcarriers, a subband, a symbol or a slot, the index units represented by l and q may be the same or different,
where W denotes precoding processing, and W (l) ═ Ck，W(i)＝Ck，CkThe value of k is related to l, and the precoding codebook for open-loop spatial multiplexing can be formed by selecting precoding codewords in the existing precoding codebook, and can also be reconstructed, which does not belong to the scope of the present invention;
the precoding processing may be precoding processing that cyclically uses different precoding codewords in units of symbols or time slots, or precoding processing that cyclically uses different precoding codewords in units of subcarriers, subcarrier groups, or subbands, where a subcarrier group consists of several consecutive subcarriers. The definitions of the sub-carriers, sub-bands, symbols and time slots belong to the prior art and are not described herein again;
where D denotes cyclic delay processing, D (i) is related to the number of transmit antennas, the number of layers, and the precoding codebook, for example, when the number of transmit antenna ports is 2,
when the number of transmit antenna ports is 4,
when the number of transmit antenna ports is 4 and the number of layers is 2,
further, the open-loop precoding processing may also be precoding processing that cyclically uses different precoding codewords in units of subcarriers, that is:
step 106: the UE performs frequency domain signal processing on the information after the open-loop precoding processing, and transforms the information after the frequency domain signal processing to a time domain for transmitting;
specifically, the UE performs frequency domain signal processing on the information subjected to the open-loop precoding, converts the information into a time domain, and transmits the information converted into the time domain on the multi-antenna port; wherein, the frequency domain signal processing is generally inserting pilot and/or subcarrier mapping.
In order to implement the foregoing method, the present invention further provides a transmitting apparatus for open-loop spatial multiplexing of an uplink multi-antenna system, as shown in fig. 5, where the apparatus is located in a UE, and includes: an open-loop pre-coding processing module 41, a frequency domain signal processing module 42 and an information transmitting module 43; wherein,
an open-loop pre-coding processing module 41, configured to perform open-loop pre-coding processing on the information subjected to transmission pre-coding processing when the information of each codeword is transmitted on the multi-antenna port, and send the information subjected to open-loop pre-coding processing to the frequency domain signal processing module 42;
the frequency domain signal processing module 42 is configured to perform frequency domain signal processing on the information after the open-loop precoding processing, and send the information after the frequency domain signal processing to the information transmitting module 43;
and an information transmitting module 43, configured to transform the information after the frequency domain signal processing to a time domain for transmission.
The open-loop precoding process may include: layer interleaving and precoding processing; or precoding processing and cyclic delay processing; or layer interleaving, precoding processing, and cyclic delay processing.
Further, the open-loop precoding processing may also be precoding processing that cyclically uses different precoding codewords in units of subcarriers.
Further, the apparatus further includes a scrambling module 44, a modulation module 45, a layer mapping module 46 and a transmission precoding processing module 47; wherein,
a scrambling module 44, configured to scramble information of each codeword when the information of each codeword is transmitted on a multi-antenna port;
a modulation module 45, configured to modulate the scrambled information;
a layer mapping module 46, configured to perform layer mapping on the modulated information;
and a transmission precoding processing module 47, configured to perform transmission precoding processing on the information on each layer after layer mapping.
By the scheme, the transmission performance of the uplink multi-antenna system during open-loop space multiplexing is improved, so that the uplink transmission performance of the UE with higher moving speed is ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (5)
1. A transmitting method of open-loop spatial multiplexing of an uplink multi-antenna system is characterized by comprising the following steps:
when User Equipment (UE) transmits information of each code word on a multi-antenna port, carrying out open-loop precoding processing on the information subjected to transmission precoding processing; specifically, the open-loop precoding processing includes: layer interleaving and precoding processing; or layer interleaving, precoding processing, and cyclic delay processing; the precoding processing is precoding processing of cyclically using different precoding code words by taking a symbol or a time slot as a unit, or precoding processing of cyclically using different precoding code words by taking a subcarrier group and a subband as a unit;
and carrying out frequency domain signal processing on the information subjected to the open-loop precoding processing, and converting the information subjected to the frequency domain signal processing into a time domain for transmitting.
2. The transmitting method of claim 1, wherein before performing the open-loop precoding process, the method further comprises: and the UE performs transmission precoding processing on the information on each layer after layer mapping.
3. The method of claim 2, wherein prior to performing transmission precoding, the method further comprises: the UE scrambles the information of each code word transmitted on the multi-antenna port; modulating the scrambled information; and performs layer mapping on the modulated information.
4. An apparatus for transmitting open-loop spatial multiplexing of an uplink multi-antenna system, the apparatus comprising: the system comprises an open-loop pre-coding processing module, a frequency domain signal processing module and an information transmitting module; wherein,
the open-loop pre-coding processing module is used for carrying out open-loop pre-coding processing on the information subjected to the transmission pre-coding processing when the information of each code word is transmitted on the multi-antenna port, and sending the information subjected to the open-loop pre-coding processing to the frequency domain signal processing module; wherein the open-loop precoding process comprises: layer interleaving and precoding processing; or layer interleaving, precoding processing, and cyclic delay processing; the precoding processing is precoding processing of cyclically using different precoding code words by taking a symbol or a time slot as a unit, or precoding processing of cyclically using different precoding code words by taking a subcarrier group and a subband as a unit;
the frequency domain signal processing module is used for carrying out frequency domain signal processing on the information subjected to the open-loop pre-coding processing and sending the information subjected to the frequency domain signal processing to the information transmitting module;
and the information transmitting module is used for converting the information after the frequency domain signal processing into a time domain for transmitting.
5. The transmitting device of claim 4, further comprising a scrambling module, a modulation module, a layer mapping module and a transmission precoding processing module; wherein,
a scrambling module, configured to scramble information of each codeword when the information of each codeword is transmitted on a multi-antenna port;
the modulation module is used for modulating the scrambled information;
the layer mapping module is used for carrying out layer mapping on the modulated information;
and the transmission precoding processing module is used for carrying out transmission precoding processing on the information on each layer after the layer mapping.
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| CN201110195549.7A CN102255691B (en) | 2011-07-13 | 2011-07-13 | A kind of launching technique and device of uplink multiaerial system Open-Loop Spatial Multiplexing |
| PCT/CN2012/077378 WO2013007146A1 (en) | 2011-07-13 | 2012-06-21 | Transmitting method and device for uplink multi-antenna system open-loop spatial multiplexing |
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| CN102255691B (en) * | 2011-07-13 | 2018-08-24 | 中兴通讯股份有限公司 | A kind of launching technique and device of uplink multiaerial system Open-Loop Spatial Multiplexing |
| CN102271027B (en) * | 2011-07-21 | 2018-03-23 | 中兴通讯股份有限公司 | A kind of recoding processing method and system of up Open-Loop Spatial Multiplexing |
| CN103475445B (en) * | 2012-06-08 | 2016-11-23 | 联芯科技有限公司 | The signal processing method of Uplink Shared Channel and device |
| CN104734764B (en) * | 2013-12-24 | 2020-02-07 | 锐迪科（重庆）微电子科技有限公司 | LTE-A uplink processing method and device |
| CN107733482A (en) * | 2016-08-11 | 2018-02-23 | 北京信威通信技术股份有限公司 | A kind of method and device of upstream multi-antenna open-loop transmission |
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