CN101686072A - Method and device for diversifying antennas - Google Patents

Method and device for diversifying antennas Download PDF

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Publication number
CN101686072A
CN101686072A CN200810211434A CN200810211434A CN101686072A CN 101686072 A CN101686072 A CN 101686072A CN 200810211434 A CN200810211434 A CN 200810211434A CN 200810211434 A CN200810211434 A CN 200810211434A CN 101686072 A CN101686072 A CN 101686072A
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wave beam
weights
encoder matrix
weight vector
encoding
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姜静
王衍文
于辉
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2009/072552 priority patent/WO2010031268A1/en
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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
    • H04B7/06—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
    • H04B7/0667—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 delayed versions of same signal
    • H04B7/0669—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 delayed versions of same signal using different channel coding between antennas

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Abstract

The invention discloses a method and a device for diversifying antennas, which are applied to a long-term evolutionary high-grade system comprising 8 antennas. The method comprises the following steps: setting a time space code matrix disclosed in the right formula, wherein S1 and S2 are symbols before coding, the row of the code matrix represents the adjacent time or the adjacent frequency domains, the column of the code matrix represents a weight value vector, and a weight value 1 and a weight value 2 are weight values which are set by a base station in advance or are generated in a self-adapting way; coding according to the code matrix and obtaining a symbol Y (disclosed in the upper formula) after diversifying processing, wherein Y=W*S, the W is a wave beam formation weight value matrix (disclosed in the upper formula), W1 is the weight value vector of a first wave beam, the dimension of the W1 is 1*8, W2 is the weight value vector of a second wave beam, and the dimension of the W2is 8*1. The invention does not increase the extra pilot-frequency expense and also can obtain better diversity gain.

Description

Antenna collection method and device
Technical field
The present invention relates to the communications field, in particular to a kind of antenna collection method and device.
Background technology
At Long Term Evolution (Long-Term Evolution, abbreviate LTE as) in the system, the descending diversity mode that has defined when transmitting antenna is 2 antennas is space frequency block coding (SpaceFrequency Block Codes abbreviates SFBC as), encoder matrix as shown in Equation 1:
Descending diversity mode when also having defined 4 antennas is frequency switched diversity (SFBC+Frequency Switch Time Division abbreviates SFBC+FSTD as), and encoder matrix is shown in the formula 2:
Figure A20081021143400052
In Long Term Evolution senior (LTE-Advanced) system, in order to improve the descending message transmission rate and the availability of frequency spectrum, descendingly can use 8 transmit antennas at most, but in correlation technique, not provide the diversity mode under 8 antennas.
Summary of the invention
The problem of the diversity mode under 8 antennas is not provided and proposes the present invention at correlation technique, for this reason, the present invention aims to provide a kind of antenna collection method and device, to address the above problem.
According to an aspect of the present invention, provide a kind of antenna collection method.
According to antenna collection method of the present invention, be applied to comprise the Long Term Evolution AS of 8 antennas, said method comprises: encoder matrix is set:
Figure A20081021143400061
Or
Figure A20081021143400062
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of described encoder matrix or adjacent frequency domain, weight vector is shown in tabulation, wherein, weights 1 and weights 2 are the weights that preestablished by the base station or self adaptation produces; Encode according to described encoder matrix, the symbol that obtains after diversity is handled is
Figure A20081021143400063
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400064
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1.
According to another aspect of the present invention, provide a kind of antenna diversity arrangement.
According to antenna diversity arrangement of the present invention, be applied to comprise the Long Term Evolution AS of 8 antennas, device comprises: module is set, is used to be provided with encoder matrix:
Figure A20081021143400071
Or
Figure A20081021143400072
Wherein, S1 and S2 are the preceding symbol of coding, the line display adjacent moment of encoder matrix or adjacent frequency domain, and weight vector is shown in tabulation, wherein, weights 1 and weights 2 are the weights that preestablished by the base station or self adaptation produces; Coding module is used for encoding according to the encoder matrix that the module setting is set, and the symbol that obtains after diversity is handled is Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400074
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1.
By the present invention, the descending diversity of 8 antennas still adopts the Alamouti diversity encoder matrix of two antennas in the LTE-Advanced system, multiply by different weights again, correspond on the different wave beams and send, having solved correlation technique does not provide the problem of diversity mode under 8 antennas, when not increasing extra pilot-frequency expense, can obtain better diversity gain.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the antenna collection method of the embodiment of the invention;
Fig. 2 is the schematic diagram according to the antenna collection method of the embodiment of the invention one;
Fig. 3 is the schematic diagram according to the antenna collection method of the embodiment of the invention two;
Fig. 4 is the schematic diagram according to the antenna collection method of the embodiment of the invention three;
Fig. 5 is the schematic diagram according to the antenna collection method of the embodiment of the invention four;
Fig. 6 is the structured flowchart according to the antenna diversity arrangement of the embodiment of the invention.
Embodiment
Functional overview
In correlation technique, Beamforming and Alamouti (name have been proposed, I carries certain) many antenna treating methods of combination, prove all that by theory analysis and simulating, verifying the diversity output signal is sent into independently wave beam respectively forms array, compare the gain that can obtain 6dB with the Alamouti diversity, wherein, the encoder matrix of Alamouti diversity is
Figure A20081021143400081
S1 and S2 are the preceding symbol of coding, behind the Alamouti coding, and corresponding adjacent moment of row or side frequency, the transmitting antenna that the row representative is different.
The present invention will form and transmit diversity in conjunction with wave beam, design the deversity scheme of LTE-Advanced system under 8 antennas, that is, 8 antennas still adopt the Alamouti diversity encoder matrix of two antennas in the LTE-Advanced system, multiply by different weights again, correspond on the different wave beams and send.Such deversity scheme is formed with the gain of 6dB than traditional wave beam, and the performance gain of 9dB is arranged than traditional 2 antenna Alamouti coding.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Method embodiment
According to embodiments of the invention, a kind of antenna collection method is provided, be applied to comprise the Long Term Evolution AS of 8 antennas, suppose that the symbol that sends is X=[x 1, x 2..., x N].Fig. 1 is the flow chart according to the antenna collection method of the embodiment of the invention, and as shown in Figure 1, this method comprises:
Step S102 is provided with encoder matrix:
Figure A20081021143400091
Or
Figure A20081021143400092
Wherein, S generates S by X by the Alamouti coding is corresponding 1And S 2Be the symbol before encoding, the line display adjacent moment of encoder matrix or adjacent frequency domain, weight vector is shown in tabulation, weights 1 and weights 2 are the weights that preestablished by the base station or self adaptation produces;
Step S104 encodes according to encoder matrix, and the symbol that obtains after diversity is handled is
Figure A20081021143400093
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400094
Weights W is the predefined fixed value in base station or passes through the generation of channel information self adaptation, W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1; Can carry out space frequency block coding (SFBC) according to encoder matrix, also can carry out space-time block code (Space Time Block Codes abbreviates STBC as) according to encoder matrix; Particularly, if be encoded to space frequency block coding, then on subcarrier 1, send S 1With-S 2*; On subcarrier 2, send S 2And S 1*; If be encoded to space-time block code, then 1 sending S constantly 1And S 2At the moment 2 transmission-S 2* and S 1*.
By this embodiment, the deversity scheme of 8 antennas is provided, the descending diversity of 8 antennas forms in conjunction with wave beam in the LTE-Advanced system, the wave beam that different symbols is corresponding different, having solved correlation technique does not provide the problem of diversity mode under 8 antennas, when not increasing extra pilot-frequency expense, can obtain better diversity gain.
Below in conjunction with example specific implementation process of the present invention is described in detail.
Embodiment one
It is the predefined fixed value in base station that this embodiment provides at weights W, be encoded to the antenna collection method under the situation of space frequency block coding, comprises the steps:
As described in step S102, the Alamouti encoder matrix is set:
Figure A20081021143400101
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of encoder matrix or adjacent frequency domain, tabulation shows that weight vector, weights 1 and weights 2 are the weights by the predefined antenna in base station; Fig. 2 is the schematic diagram according to the antenna collection method of the embodiment of the invention one, by this weights generate the shape of wave beam and the symbol that sent (promptly, symbol before the above-mentioned coding) as shown in Figure 2, each sub-district is divided into wave beam 1, wave beam 2, wave beam 3,4 four wave beams of wave beam successively according to the angle of its coverage, one group in per two wave beams, wave beam 1 and wave beam 3 are formed first group of weights, and wave beam 2 and wave beam 4 are formed second group of weights; The overlay area of supposing the base station is 0 °～120 °, and then wave beam 1 is aimed at 15 °, and wave beam 2 is aimed at 45 °, and wave beam 3 is aimed at 75 °, and wave beam 4 is aimed at 105 °;
As described in step S104, to encode according to encoder matrix, the symbol that obtains after diversity is handled is
Figure A20081021143400102
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400111
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1, and this is encoded to space frequency block coding, particularly, sends S on subcarrier 1 1With-S 2*, on subcarrier 2, send S 2And S 1*, wherein, adopt weights 1 to send S 1And S 2, adopt weights 2 transmission-S 2* and S 1*, as shown in Figure 2, on wave beam 1, send S 1And S 2, transmission-S on wave beam 2 2* and S 1*, on wave beam 3, send S 1And S 2, transmission-S on wave beam 4 2* and S 1*.
In this embodiment, first group of weights W 1With second group of weights W 2Mutually orthogonal, the symbol that makes Alamouti coding can obtain maximum diversity gain through channel fully independently.
Embodiment two
This embodiment provides at weights W and has generated, has been encoded to antenna collection method under the situation of space frequency block coding by the channel information self adaptation, comprises the steps:
As described in step S102, the Alamouti encoder matrix is set:
Figure A20081021143400112
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of encoder matrix or adjacent frequency domain, weight vector is shown in tabulation, weights 1 and weights 2 are generated according to the uplink channel information self adaptation by the user, wherein, Fig. 3 is the schematic diagram according to the antenna collection method of the embodiment of the invention two, the shape of this weights generation wave beam and the symbol that is sent are as shown in Figure 3, each sub-district is divided into wave beam 1 and wave beam 2, wave beam 1 and wave beam 2 reach the angle information generation according to mobile subscriber's ripple, wherein, the ripple of wave beam 1 corresponding energy maximum reaches the angular direction, and wave beam 2 corresponding energy time big ripple reaches the angular direction;
As described in step S104, to encode according to encoder matrix, the symbol that obtains after diversity is handled is
Figure A20081021143400121
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400122
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1, and this is encoded to space frequency block coding, particularly, on subcarrier 1, send S1 and-S2*, on subcarrier 2, send S 2And S 1*, wherein, adopt weights 1 to send S1 and S2, adopt weights 2 transmission-S 2* and S 1*, as shown in Figure 3, on wave beam 1, send S 1And S 2, transmission-S on wave beam 2 2* and S 1*.
In this embodiment, first group of weights W 1With second group of weights W 2Mutually orthogonal, at the symbol of Alamouti coding (to S 1And S 2) remain unchanged in the process of transmitting, and through channel fully independently, but at the symbol of next Alamouti coding self adaptation is adjusted, obtain maximum diversity gain.
Embodiment three
It is the predefined fixed value in base station that this embodiment provides at weights W, be encoded to the antenna collection method under the situation of space-time block code, comprises the steps:
As described in step S102, the Alamouti encoder matrix is set:
Figure A20081021143400123
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of encoder matrix or adjacent frequency domain, tabulation shows that weight vector, weights 1 and weights 2 are the weights by the predefined antenna in base station; Fig. 4 is the schematic diagram according to the antenna collection method of the embodiment of the invention three, by this weights generate the shape of wave beam and the symbol that sent (promptly, symbol before the above-mentioned coding) as shown in Figure 4, each sub-district is divided into wave beam 1, wave beam 2, wave beam 3,4 four wave beams of wave beam successively according to the angle of its coverage, one group in per two wave beams, wave beam 1 and wave beam 3 are formed first group of weights, and wave beam 2 and wave beam 4 are formed second group of weights; The overlay area of supposing the base station is 0 °～120 °, and then wave beam 1 is aimed at 15 °, and wave beam 2 is aimed at 45 °, and wave beam 3 is aimed at 75 °, and wave beam 4 is aimed at 105 °;
As described in step S104, to encode according to encoder matrix, the symbol that obtains after diversity is handled is
Figure A20081021143400131
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400132
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1, and this is encoded to space frequency block coding, particularly, 1 is sending S constantly 1With-S 2*, 2 sending S constantly 2And S 1*, wherein, adopt weights 1 to send S 1And S 2, adopt weights 2 transmission-S 2* and S 1*, as shown in Figure 4, on wave beam 1, send S 1And S 2, transmission-S on wave beam 2 2* and S 1*, on wave beam 3, send S 1And S 2, transmission-S on wave beam 4 2* and S 1*.
In this embodiment, first group of weights W 1With second group of weights W 2Mutually orthogonal, the symbol that makes Alamouti coding can obtain maximum diversity gain through channel fully independently.
Embodiment four
This embodiment provides at weights W and has generated, has been encoded to antenna collection method under the situation of space-time block code by the channel information self adaptation, comprises the steps:
As described in step S102, the Alamouti encoder matrix is set:
Figure A20081021143400133
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of encoder matrix, weight vector is shown in tabulation, carrying out diversity according to formula 1 handles, weights W is generated according to the uplink channel information self adaptation by the user, wherein, Fig. 5 is the schematic diagram according to the antenna collection method of the embodiment of the invention four, the shape of this weights generation wave beam and the symbol that is sent are as shown in Figure 5, each sub-district is divided into wave beam 1 and wave beam 2, and wave beam 1 and wave beam 2 reach the angle information generation according to mobile subscriber's ripple, wherein, the ripple of wave beam 1 corresponding energy maximum reaches the angular direction, and wave beam 2 corresponding energy time big ripple reaches the angular direction;
As described in step S104, to encode according to encoder matrix, the symbol that obtains after diversity is handled is
Figure A20081021143400141
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400142
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1, and this is encoded to space frequency block coding, particularly, 1 is sending S constantly 1With-S 2*, 2 sending S constantly 2And S 1*, wherein, on weights 1, send S 1And S 2, transmission-S on weights 2 2* and S 1*, as shown in Figure 5, on wave beam 1, send S 1And S 2, transmission-S on wave beam 2 2* and S 1*.
In this embodiment, first group of weights W 1With second group of weights W 2Mutually orthogonal, at the symbol of Alamouti coding (to S 1And S 2) remain unchanged in the process of transmitting, and through channel fully independently, but at the symbol of next Alamouti coding self adaptation is adjusted, obtain maximum diversity gain.
Device embodiment
According to embodiments of the invention, a kind of antenna diversity arrangement is provided, be applied to comprise the Long Term Evolution AS of 8 antennas.Fig. 6 is the structured flowchart according to the antenna diversity arrangement of the embodiment of the invention, and as shown in Figure 6, this device comprises: module 62 and coding module 64 are set, below said structure are described in detail.
Module 62 is set, is used to be provided with encoder matrix:
Figure A20081021143400151
Or
Figure A20081021143400152
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of encoder matrix or adjacent frequency domain, weight vector is shown in tabulation, wherein, weights 1 and weights 2 are the weights that preestablished by the base station or self adaptation produces.
Coding module 64 is connected to module 62 is set, and is used for encoding according to the encoder matrix that module 62 settings are set, and the symbol that obtains after diversity is handled is
Figure A20081021143400153
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A20081021143400154
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1.
Preferably, coding module 64 is used for encoding with following two kinds of coded systems, specifically describes as follows:
(1) coding module 64 is used for encoding in the mode of space frequency block coding, and coding module 64 also comprises: first sends submodule, is used for encoding in the following manner transmit operation: send S on subcarrier 1 1With-S 2*; On subcarrier 2, send S 2And S 1*.
(2) coding module 64 is used for encoding in the mode of space-time block code, and coding module 64 also comprises: second sends submodule, is used for encoding in the following manner transmit operation: 1 sending S constantly 1And S 2At the moment 2 transmission-S 2* and S 1*.
By above embodiment of the present invention, the descending diversity of 8 antennas forms in conjunction with wave beam in the LTE-Advanced system, the wave beam that different symbols is corresponding different, having solved correlation technique does not provide the problem of diversity mode under 8 antennas, when not increasing extra pilot-frequency expense, can obtain better diversity gain.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. antenna collection method is applied to comprise the Long Term Evolution AS of 8 antennas,
It is characterized in that described method comprises:
Encoder matrix is set:
Figure A2008102114340002C1
Or
Figure A2008102114340002C2
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of described encoder matrix or adjacent frequency domain, weight vector is shown in tabulation, wherein, weights 1 and weights 2 are the weights that preestablished by the base station or self adaptation produces;
Encode according to described encoder matrix, obtain the symbol after diversity is handled
Figure A2008102114340002C3
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A2008102114340002C4
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1.
2. method according to claim 1 is characterized in that, the described space frequency block coding that is encoded to carries out space-time block code according to described encoder matrix and comprises:
On subcarrier 1, send S 1With-S 2*;
On subcarrier 2, send S 2And S 1*.
3. method according to claim 2 is characterized in that, described weights W is the predefined fixed value in base station.
4. method according to claim 2 is characterized in that, described weights W generates by the channel information self adaptation.
5. according to claim 3 or 4 described methods, it is characterized in that described first group of weights W 1With described second group of weights W 2Mutually orthogonal.
6. method according to claim 1 is characterized in that, the described space-time block code that is encoded to carries out space-time block code according to described encoder matrix and comprises:
1 sending S constantly 1And S 2
At the moment 2 transmission-S 2* and S 1*.
7. antenna diversity arrangement is applied to comprise the Long Term Evolution AS of 8 antennas it is characterized in that described device comprises:
Module is set, is used to be provided with encoder matrix:
Figure A2008102114340003C1
Or
Figure A2008102114340003C2
Wherein, S 1And S 2Be the symbol before encoding, the line display adjacent moment of described encoder matrix or adjacent frequency domain, weight vector is shown in tabulation, wherein, weights 1 and weights 2 are the weights that preestablished by the base station or self adaptation produces;
Coding module is used for encoding according to the described described encoder matrix that the module setting is set, and the symbol that obtains after diversity is handled is
Figure A2008102114340003C3
Wherein, Y=W*S, W are that wave beam forms weight matrix,
Figure A2008102114340003C4
W 1Be the weight vector of first wave beam, dimension is 1 * 8, W 2Be the weight vector of second wave beam, dimension is 8 * 1.
8. device according to claim 7 is characterized in that, described coding module is used for encoding in the mode of space frequency block coding, and described coding module also comprises:
First sends submodule, is used for encoding in the following manner transmit operation: send S on subcarrier 1 1With-S 2*; On subcarrier 2, send S 2And S 1*.
9. device according to claim 7 is characterized in that, described coding module is used for encoding in the mode of space-time block code, and described coding module also comprises:
Second sends submodule, is used for encoding in the following manner transmit operation: 1 sending S constantly 1And S 2At the moment 2 transmission-S 2* and S 1*.
CN200810211434A 2008-09-22 2008-09-22 Method and device for diversifying antennas Pending CN101686072A (en)

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Cited By (2)

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CN102377467A (en) * 2010-08-23 2012-03-14 中国移动通信集团公司 Eight-antenna downlink control channel sending method and device

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CN1327730C (en) * 2002-07-19 2007-07-18 国立新加坡大学 Radio communication equipment and method
CN100392998C (en) * 2005-07-06 2008-06-04 哈尔滨工业大学 Intelligent antenna downstream wave-packet formation method combined with space hour block coding
CN100407825C (en) * 2005-10-18 2008-07-30 上海贝尔阿尔卡特股份有限公司 A distributed base station, communication system and its used signal transmission method
US7889131B2 (en) * 2007-03-26 2011-02-15 Cisco Technology, Inc. Beamformed space time code communication with testing spatial signature generation
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CN102223213A (en) * 2010-04-16 2011-10-19 中国移动通信集团公司 Signal transmitting method and device
CN102223213B (en) * 2010-04-16 2014-10-08 中国移动通信集团公司 Signal transmitting method and device
CN102377467A (en) * 2010-08-23 2012-03-14 中国移动通信集团公司 Eight-antenna downlink control channel sending method and device
CN102377467B (en) * 2010-08-23 2015-02-04 中国移动通信集团公司 Eight-antenna downlink control channel sending method and device

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