CN104158579A - Method and device for antenna selection - Google Patents

Method and device for antenna selection Download PDF

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Publication number
CN104158579A
CN104158579A CN201310177782.1A CN201310177782A CN104158579A CN 104158579 A CN104158579 A CN 104158579A CN 201310177782 A CN201310177782 A CN 201310177782A CN 104158579 A CN104158579 A CN 104158579A
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China
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subcarrier
antenna
transmitting antenna
receiving
channel information
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王力
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201310177782.1A priority Critical patent/CN104158579A/en
Priority to PCT/CN2013/088712 priority patent/WO2014183424A1/en
Publication of CN104158579A publication Critical patent/CN104158579A/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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method and device for antenna selection, relates to the technical field of wireless communication, and solves the problems in the prior art that since adjacent subcarriers may come from different transceiving antennas, a receiving end cannot accurately perform channel estimation after receiving the subcarriers, and the subcarriers cannot be correctly received. The method includes: obtaining channel information of each subcarrier, according to the channel information of each subcarrier, determining a transmitting antenna corresponding to a transceiving antenna with optimal performance indexes in the transceiving antenna of each subcarrier as a target transmitting antenna, diving subcarriers which have the same target transmitting antenna and are adjacent into a subcarrier block, and the subcarrier block including a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol is transmitted through the target transmitting antenna. The method for antenna selection in the embodiment of the invention is applied to a processing process of antenna selection.

Description

Antenna selection method and device
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for antenna selection.
Background
The existing WLAN (Wireless Local Area network) technology has been widely applied to the occasions such as home, campus, hotel, enterprise office, etc. due to its features of Wireless transmission, high-speed access, and low cost.
At present, a further requirement is provided for the WLAN, and a requirement that the coverage reaches 1 km is provided, but when the WLAN is applied in an outdoor scene, the WLAN inevitably faces multipath delay spread, so that the channel quality in the bandwidth is no longer similar, and the quality differs greatly. In order to solve this problem, antenna selection of a WIFI (wireless fidelity) system based on MIMO (multiple-input multiple-output) -OFDM (orthogonal frequency Division Multiplexing) is proposed, and each subcarrier of each antenna in MIMO is configured, so that the advantage of antenna selection can be exerted to the maximum extent.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: since the adjacent subcarriers may come from different transmitting antennas, the receiving end cannot accurately perform channel estimation after receiving the subcarriers, resulting in that the subcarriers cannot be correctly received.
Disclosure of Invention
The embodiment of the invention provides an antenna selection method and an antenna selection device, which improve the channel estimation performance of each subcarrier.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for antenna selection, including:
acquiring channel information of each subcarrier, wherein the channel information is the signal strength of each subcarrier received on a channel between different transceiving antenna pairs;
determining a transmitting antenna corresponding to the transmitting-receiving antenna pair with the optimal performance index in the transmitting-receiving antenna pair of each subcarrier as a target transmitting antenna according to the channel information of each subcarrier, wherein the target transmitting antenna is used for transmitting the corresponding subcarrier;
dividing the same and adjacent subcarriers of a target transmitting antenna into a subcarrier block, wherein the subcarrier block comprises a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol is transmitted through the target transmitting antenna.
In a first possible implementation manner of the first aspect, the determining, according to the channel information of each subcarrier, a transmit antenna corresponding to a transmit-receive antenna pair with an optimal performance index in the transmit-receive antenna pair of each subcarrier as a target transmit antenna includes:
calculating first equivalent channel information of each subcarrier according to the maximum ratio combination, wherein the first equivalent channel information is equivalent channel information between each transmitting antenna and different receiving antennas;
and determining the transmitting antenna corresponding to the maximum value in the first equivalent channel information as a target transmitting antenna.
In a second possible implementation manner of the first aspect, the determining, according to the channel information of each subcarrier, a transmit antenna corresponding to a transmit-receive antenna pair with an optimal performance index in the transmit-receive antenna pair of each subcarrier as a target transmit antenna includes:
calculating the signal-to-noise ratio of the channel between each transmitting antenna and different receiving antennas of each subcarrier;
taking the maximum value in the signal-to-noise ratio as a performance index of a corresponding transmitting antenna;
and determining the transmitting antenna corresponding to the maximum value in the performance index as a target transmitting antenna.
With reference to the first possible implementation manner or the second possible implementation manner of the first aspect, in a third possible implementation manner, when the terminal is a receiving end, the acquiring channel information of each subcarrier includes:
receiving a data frame sent by a sending end, wherein the data frame comprises a pilot signal of each subcarrier;
and determining the channel information of each subcarrier according to the pilot signal.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the method includes:
and sending a first feedback message carrying indication information to the sending end, wherein the indication information is used for indicating the division of the subcarrier blocks, and the sending end sends the target transmitting antenna of each subcarrier block.
With reference to the first possible implementation manner or the second possible implementation manner of the first aspect, in a fifth possible implementation manner, when the terminal is a transmitting end, the acquiring channel information of each subcarrier includes:
and acquiring a second feedback message sent by a receiving end, and acquiring the channel information of each subcarrier from the second feedback message.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the method further includes:
and sending a third feedback message to the receiving end, wherein the third feedback message comprises receiving antenna indication information and is used for informing the receiving end of receiving the appointed receiving antenna of each subcarrier block.
With reference to the fourth possible implementation manner or the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the performance index is a signal strength or a signal-to-noise ratio of a channel between the transceiver antenna pair.
In a second aspect, the present invention provides a terminal, comprising:
an obtaining unit, configured to obtain channel information of each subcarrier, where the channel information is a signal strength of each subcarrier received on a channel between different transceiver antenna pairs;
a first processing unit, configured to determine, according to the channel information of each subcarrier, that a transmitting antenna corresponding to a transmitting-receiving antenna pair with an optimal performance index among the transmitting-receiving antenna pairs of each subcarrier is a target transmitting antenna, where the target transmitting antenna is used to transmit the corresponding subcarrier;
and the second processing unit is used for dividing the subcarriers which are the same as and adjacent to the target transmitting antenna into a subcarrier block, and the subcarrier block comprises a pilot symbol so as to transmit the corresponding subcarrier block carrying the pilot symbol through the target transmitting antenna.
In a first possible implementation manner of the second aspect, the first processing unit includes:
a first processing module, configured to calculate first equivalent channel information of each subcarrier according to a maximum ratio combination, where the first equivalent channel information is equivalent channel information between each transmitting antenna and different receiving antennas;
and the second processing module is used for determining the transmitting antenna corresponding to the maximum value in the first equivalent channel information as a target transmitting antenna.
In a second possible implementation manner of the second aspect, the first processing unit includes:
a third processing module, configured to calculate a signal-to-noise ratio of a channel between each transmitting antenna and a different receiving antenna of each subcarrier;
the fourth processing module is used for taking the maximum value in the signal-to-noise ratio as the performance index of the corresponding transmitting antenna;
and the fifth processing module is used for determining the transmitting antenna corresponding to the maximum value in the performance index as a target transmitting antenna.
With reference to the first possible implementation manner or the second possible implementation manner of the second aspect, in a third possible implementation manner, when the terminal is a receiving end, the obtaining unit includes:
a receiving module, configured to receive a data frame sent by a sending end, where the data frame includes a pilot signal of each subcarrier;
a determining module, configured to determine the channel information of each subcarrier according to the pilot signal.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, the terminal further includes:
a first sending unit, configured to send a first feedback message carrying indication information to the sending end, where the indication information is used to indicate the division of the subcarrier blocks, and the sending end sends the target transmit antenna of each subcarrier block.
With reference to the first possible implementation manner or the second possible implementation manner of the second aspect, in a fifth possible implementation manner, when the terminal is a sending end, the obtaining unit is specifically configured to obtain a second feedback message sent by a receiving end, and obtain channel information of each subcarrier from the second feedback message.
With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, the terminal further includes:
a second sending unit, configured to send a third feedback message to the receiving end, where the third feedback message includes receiving antenna indication information, and is used to notify the receiving end to receive the designated receiving antenna of each subcarrier block.
With reference to the fourth possible implementation manner or the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner, the performance index in the first processing unit is a signal strength or a signal-to-noise ratio of a channel between a transceiver antenna pair.
The method and the device for selecting the antenna provided by the embodiment of the invention are characterized in that channel information of each subcarrier is obtained, the channel information is the signal strength of each subcarrier received on a channel between different receiving and transmitting antenna pairs, the transmitting antenna corresponding to the receiving and transmitting antenna pair with the optimal performance index in each receiving and transmitting antenna pair of each subcarrier is determined as a target transmitting antenna according to the channel information of each subcarrier, the target transmitting antenna is used for transmitting the corresponding subcarrier, then the same and adjacent subcarriers of the target transmitting antenna are divided into a subcarrier block, and the subcarrier block comprises a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol can be transmitted through the target transmitting antenna. The embodiment of the invention solves the problem that the receiving end can not accurately carry out channel estimation after receiving the sub-carriers because the adjacent sub-carriers can come from different transmitting antennas in the prior art, so that the sub-carriers can not be correctly received, and improves the channel estimation performance of each sub-carrier.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for antenna selection according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for antenna selection according to an embodiment of the present invention;
fig. 3 is a flowchart of another method for antenna selection according to an embodiment of the present invention;
fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention;
fig. 5 is a structural diagram of a first processing unit in the terminal according to the embodiment of the present invention;
fig. 6 is a block diagram of another first processing unit in a terminal according to an embodiment of the present invention;
fig. 7 is a structural diagram of an obtaining unit in a terminal according to an embodiment of the present invention;
fig. 8 is a block diagram of another terminal according to an embodiment of the present invention;
fig. 9 is a block diagram of another terminal according to an embodiment of the present invention;
fig. 10 is a structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an antenna selection method, including the following steps:
101. acquiring channel information of each subcarrier, wherein the channel information is the signal strength of each subcarrier received on a channel between different transceiving antenna pairs;
102. determining a transmitting antenna corresponding to the transmitting-receiving antenna pair with the optimal performance index in the transmitting-receiving antenna pair of each subcarrier as a target transmitting antenna according to the channel information of each subcarrier, wherein the target transmitting antenna is used for transmitting the corresponding subcarrier;
103. dividing the same and adjacent subcarriers of a target transmitting antenna into a subcarrier block, wherein the subcarrier block comprises a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol is transmitted through the target transmitting antenna.
The embodiment of the invention provides an antenna selection method, which comprises the steps of obtaining channel information of each subcarrier, wherein the channel information is the signal strength of each subcarrier received on a channel between different receiving and transmitting antenna pairs, determining a transmitting antenna corresponding to a receiving and transmitting antenna pair with the optimal performance index in each receiving and transmitting antenna pair of each subcarrier as a target transmitting antenna according to the channel information of each subcarrier, wherein the target transmitting antenna is used for transmitting the corresponding subcarrier, dividing the same and adjacent subcarriers of the target transmitting antenna into a subcarrier block, and enabling the subcarrier block to comprise a pilot symbol so as to transmit the corresponding subcarrier block carrying the pilot symbol through the target transmitting antenna. The embodiment of the invention solves the problem that the receiving end can not accurately carry out channel estimation after receiving the sub-carriers because the adjacent sub-carriers can come from different transmitting antennas in the prior art, so that the sub-carriers can not be correctly received, and improves the channel estimation performance of each sub-carrier.
In an implementation manner of the embodiment of the present invention, a method for selecting an antenna is provided, as shown in fig. 2, the method includes the following steps:
201. a receiving end receives a data frame sent by a sending end, wherein the data frame comprises a pilot signal of each subcarrier;
202. and determining the channel information of each subcarrier according to the pilot signal.
The pilot signal is described by taking LTF (Long Training Field) as an example, and the data frame may be an NDP (null data Packet) or a common data frame, where the NDP includes a Training sequence corresponding to each transmitting antenna, and the LTF1.. LTFN obtains channel information from a receiving antenna to the transmitting antenna through channel estimation. When the data frame is a normal frame, the channel information from the receiving antenna to the transmitting antenna may be estimated according to the LTF in the preamble of the normal frame, or the channel information from the receiving antenna to the transmitting antenna may be estimated according to the LTF1.. LTFN in the preamble of the normal frame.
The received signal strength of each sub-carrier on the channel between different transmit-receive antenna pairs can be obtained according to formula (1):
y is Hx + N formula (1)
Wherein y represents a signal received by the receiving end on a subcarrier, x represents a signal sent by the transmitting end, i.e., LTF information, and x is known to the receiving end according to a protocol specification, N represents noise, and H is an m × N channel matrix, where m represents m transmitting antennas, N represents N receiving antennas, and the magnitude of values in the matrix represents the strength of the signal received by the receiving end.
Since x is known to the receiving end, and y is received, the matrix H can be estimated and the received signal strength on the channel between each transmit-receive antenna pair can be obtained.
For example,indicating channel information from the ith receiving antenna to the jth transmitting antenna on the kth subcarrier.
203. And determining a transmitting antenna corresponding to the transmitting-receiving antenna pair with the optimal performance index in the transmitting-receiving antenna pair of each subcarrier as a target transmitting antenna according to the channel information of each subcarrier, so as to transmit the corresponding subcarrier on the target transmitting antenna.
The performance index is the signal strength or the signal-to-noise ratio of a channel between the transmitting and receiving antenna pairs, and the target transmitting antenna can be determined in the following two ways.
In a first way,
Calculating first equivalent channel information of each subcarrier according to the maximum ratio combination, wherein the first equivalent channel information is equivalent channel information between each transmitting antenna and different receiving antennas;
and determining the transmitting antenna corresponding to the maximum value in the first equivalent channel information as a target transmitting antenna.
Suppose that the channel information between one transmitting antenna and n receiving antennas is h1、h2...hn，h*Expressing the conjugate of h, the first equivalent channel information between the transmitting antenna 1 and the n receiving antennas is obtained according to formula (2):
|H1|2＝h1*h1 *+h2*h2 *+...hn*hn *formula (2)
Wherein, | H1|2Representing the first equivalent channel information between transmit antenna 1 and the n receive antennas. Obtaining all the first equivalent channel information | H corresponding to m transmitting antennas according to the formula (2)1|2、|H2|2...|Hm|2。
From the first equivalent channel information | H1|2、|H2|2...|Hm|2Find the maximum value | Hj|2The maximum value | Hj|2The corresponding transmitting antenna is the target transmitting antenna.
The second way,
Calculating the signal-to-noise ratio of the channel between each transmitting antenna and different receiving antennas of each subcarrier;
taking the maximum value in the signal-to-noise ratio as a performance index of a corresponding transmitting antenna;
and determining the transmitting antenna corresponding to the maximum value in the performance index as a target transmitting antenna.
Suppose that the channel information between one transmitting antenna and n receiving antennas is h1、h2...hn，h*The conjugate of h is expressed, and the signal-to-noise ratio of the channel between one transmitting antenna and N receiving antennas is h because the noises are the same and are N1*h1 */N、h2*h2 */N...hn*hn *N, taking the maximum value h of said signal-to-noise ratioj*hj *And if the/N is taken as the performance index of the transmitting antenna, obtaining the corresponding performance indexes of the m transmitting antennas, selecting the maximum performance index from the m performance indexes, and determining the transmitting antenna corresponding to the maximum value in the performance indexes as the target transmitting antenna.
204. The receiving end divides the adjacent sub-carriers with the same target transmitting antenna into a sub-carrier block, and the sub-carrier block comprises a pilot frequency symbol, so that the corresponding sub-carrier block carrying the pilot frequency symbol is transmitted through the target transmitting antenna.
According to the channel coherence bandwidth, the subcarriers which are the same and adjacent to the target transmitting antenna are divided into a subcarrier block, and a pilot symbol is included in the subcarrier block.
For example, assuming a channel coherence bandwidth of 14 OFDM subcarriers in frequency width, 56 subcarriers are used for transmission, and divided into 4 subcarrier blocks, i.e., 1-14, 15-28, 29-42, 43-56. The antenna selection for each subcarrier block is the same and one pilot symbol is included in the subcarrier block.
205. And the receiving end sends a feedback message carrying indication information to the sending end, wherein the indication information is used for indicating the division of the subcarrier blocks, and the sending end sends the target transmitting antenna of each subcarrier block.
The feedback message includes, in addition to the indication of the division of the subcarrier blocks and the indication information of the target transmitting antenna of each subcarrier block sent by the sending end, the feedback message carried in the feedback message in the prior art.
206. And the sending end receives the feedback message which is sent by the receiving end and carries the indication information.
207. And the sending end sends the target transmitting antenna indicated by each subcarrier block in the indication information according to the received feedback information.
For example, taking a 2MHz bandwidth system with 2 transmitting and 2 receiving as an example, after the receiving end receives the data frame sent by the sending end, the channel information of each subcarrier is obtained from the data frame, for example,indicating channel information from the ith receiving antenna to the jth transmitting antenna on the kth subcarrier. The receiving end adopts a maximum ratio combination mode, and the first equivalent channel information between the same transmitting antenna and two receiving antennas isThe formula for selecting the highest signal strength of different transceiving antenna pairs on the kth subcarrier can be expressed as max ( | H 1 k | 2 , | H 2 k | 2 , ( | H 1 k + H 2 k | 2 / 2 ) ) , Wherein, | H 1 k | 2 indicating the signal strength of the kth subcarrier on the equivalent channel from the two receive antennas to the 1 st transmit antenna,represents the signal strength of the kth sub-carrier on the equivalent channel from the two receive antennas to the 2 nd transmit antenna,and representing the signal strength of the kth subcarrier on the equivalent channel from the two receiving antennas to the 1 st transmitting antenna and the average value of the signal strengths of the equivalent channels from the two receiving antennas to the 2 nd transmitting antenna, and selecting the transmitting antenna in the transceiving antenna pair with the maximum signal strength as the target transmitting antenna of the kth subcarrier.
In addition, according to the channel coherence bandwidth, adjacent subcarriers are divided into one subcarrier block, each subcarrier block needs 2 bits to represent the transmission condition of the target transmitting antenna, for example, 10 represents the 1 st transmitting antenna transmission, 01 represents the 2 nd transmitting antenna transmission, and 11 represents the 1 st and 2 nd transmitting antennas to transmit simultaneously. When there are 52 subcarriers in 802.11ah at 2MHz, 52bit bitmap is needed to indicate subcarrier allocation, and thus 104bit is needed to indicate the transmission condition of the subcarriers. When 52 sub-carriers are divided into four sub-carrier blocks, and each sub-carrier block comprises 13 continuous sub-carriers, 8 bits are used to represent the transmission condition of the target transmitting antenna of the 4 sub-carrier blocks.
Optionally, each subcarrier block may simultaneously indicate the transmission condition of the target transmit antenna and the reception condition of the receive antenna by 4 bits, and when there are 52 subcarriers, 208 bits are required to indicate the reception and transmission conditions of the subcarriers. When 52 sub-carriers are divided into four sub-carrier blocks, each sub-carrier block comprises 13 continuous sub-carriers, 16 bits are used to represent the receiving and transmitting conditions of the 4 sub-carrier blocks.
The allocation information is carried in indication information in a feedback message sent by the receiving end to the sending end, and in addition, the feedback message may further include a division condition of subcarrier blocks.
The feedback message may include a CSI (channel state information) frame, an ACK (Acknowledgement) frame, a block ACK (block Acknowledgement) frame, a short ACK (short Acknowledgement) frame, a short block frame, or other frames.
The physical layer carrying location of the feedback message may be a data field (data field) of an acknowledgement frame (ACK frame), or a data field (datafield) of a Block acknowledgement feedback frame (Block ACK frame), or a signal field (SIG field) of a short acknowledgement frame (short ACK frame), or a signal field (SIG field) of a short Block acknowledgement feedback frame (short Block ACK frame), a MAC (Media Access Control) Control frame, a MAC management frame, a data field and/or a signal field of a normal data frame, etc.
After the sending end receives the feedback message sent by the receiving end, the sending end sends each subcarrier block according to the target transmitting antenna indicated in the indication information carried in the feedback message.
The sub-carrier block comprises a pilot symbol, so that the receiving end can correct the channel of the sub-carrier block when receiving the sub-carrier block carrying the pilot symbol, and the sub-carrier block is correctly obtained. Joint interpolation may be considered when adjacent subcarrier blocks are from the same target transmit antenna. When the position of the pilot frequency symbol changes periodically with time, the correction is only carried out when the pilot frequency symbol exists in the continuous sub-carrier block from the same target transmitting antenna, and if the pilot frequency symbol does not exist in the continuous sub-carrier block where the same target transmitting antenna exists, the channel estimation correction is carried out by utilizing the pilot frequency symbol in the previous sub-carrier block.
In another implementation manner of the embodiment of the present invention, a method for selecting an antenna is provided, as shown in fig. 3, the method includes the following steps:
301. a receiving end receives a data frame sent by a sending end, wherein the data frame comprises a pilot signal of each subcarrier.
302. And the receiving end determines the channel information of each subcarrier according to the pilot signal.
The pilot signal is described by taking LTF (Long Training Field) as an example, and the data frame may be an NDP (null data Packet) or a common data frame, where the NDP includes a Training sequence corresponding to each transmitting antenna, and the LTF1.. LTFN obtains channel information from a receiving antenna to the transmitting antenna through channel estimation. When the data frame is a normal frame, the channel information from the receiving antenna to the transmitting antenna can be estimated according to the LTF in the preamble of the normal frame, or the channel information from the receiving antenna to the transmitting antenna can be estimated according to the ltfl.. LTFN in the preamble of the normal frame.
The received signal strength of each sub-carrier on the channel between different transmit-receive antenna pairs can be obtained according to equation (1).
For example,indicating channel information from the ith receiving antenna to the jth transmitting antenna on the kth subcarrier.
303. And the receiving end sends a feedback message to the sending end, wherein the feedback message carries the channel information of each subcarrier.
304. The sending end obtains the feedback message sent by the receiving end and obtains the channel information of each subcarrier from the feedback message.
305. And determining a transmitting antenna corresponding to the transmitting-receiving antenna pair with the optimal performance index in the transmitting-receiving antenna pair of each subcarrier as a target transmitting antenna according to the channel information of each subcarrier, wherein the target transmitting antenna is used for transmitting the corresponding subcarrier.
The specific manner of determining the target transmitting antenna may refer to two manners in step 203, which is not described herein again.
306. And sending a third feedback message to the receiving end, wherein the third feedback message comprises receiving antenna indication information and is used for informing the receiving end of receiving the appointed receiving antenna of each subcarrier block.
In this embodiment, the target transmitting antenna is specified by the transmitting end, and the receiving end does not determine the receiving antenna for receiving the subcarrier block transmitted by the target transmitting antenna, so the specified receiving antenna is determined by the transmitting end.
Wherein, the determination of the receiving antenna may refer to two manners described in step 203;
in a first mode
Calculating second equivalent channel information of each subcarrier according to the maximum ratio combination, wherein the second equivalent channel information is equivalent channel information between each receiving antenna and different transmitting antennas;
and determining the receiving antenna corresponding to the maximum value in the second equivalent channel information as a designated receiving antenna.
Suppose that the channel information between one receiving antenna and m transmitting antennas is h1′、h2′...hm′，h′*Representing the conjugate of h', the second equivalent channel information between the receiving antenna 1 and the m transmitting antennas is obtained according to formula (3):
|H1′|2＝h1′*h1′*+h2′*h2′*+...hm′*hm′*formula (2)
Wherein, | H1′|2Representing second equivalent channel information between receive antenna 1 and the m transmit antennas. Obtaining all second equivalent channel information | H corresponding to the n receiving antennas according to the formula (3)1′|2、|H2′|2...|Hn′|2。
From the second equivalent channel information | H1′|2、|H1′|2...|Hn′|2Find the maximum value | Hi′|2The maximum value | Hi′|2The corresponding receiving antenna is the appointed receiving antenna.
The second way,
Calculating the signal-to-noise ratio of the channel between each receiving antenna and different transmitting antennas of each subcarrier;
taking the maximum value in the signal-to-noise ratio as a performance index of a corresponding receiving antenna;
and determining the receiving antenna corresponding to the maximum value in the performance index as a specified receiving antenna.
Suppose a receiving dayThe channel information between the line and the m transmitting antennas is h1′、h2′...hm′，h′*The conjugate of h' is expressed, and the signal-to-noise ratio of the channel between one receiving antenna and m transmitting antennas is h because the noises are the same and are N1′*h1 */N、h2′*h2′*/N...hm′*hm′*N, taking the maximum value h of said signal-to-noise ratioi′*hi′*And if the/N is taken as the performance index of the receiving antenna, obtaining the corresponding performance indexes of the N receiving antennas, selecting the maximum performance index from the N performance indexes, and determining the receiving antenna corresponding to the maximum value in the performance indexes as the specified receiving antenna.
307. And the receiving end receives the third feedback message sent by the sending end.
And receiving the subcarrier block sent by the sending end according to the appointed receiving antenna in the third feedback message.
308. The transmitting end divides the adjacent subcarriers which are the same with the target transmitting antenna into a subcarrier block, and the subcarrier block comprises a pilot frequency symbol, so that the corresponding subcarrier block carrying the pilot frequency symbol is transmitted through the target transmitting antenna.
According to the channel coherence bandwidth, dividing adjacent subcarriers into a subcarrier block, wherein the subcarrier block comprises a pilot symbol, so that when the receiving end receives the subcarrier block carrying the pilot symbol, the receiving end can correct the channel of the subcarrier block, and the subcarrier block is correctly obtained.
For example, taking a 2Mhz bandwidth system with 2 transmitting and 2 receiving as an example, after the receiving end receives the data frame sent by the sending end, the channel information of each subcarrier is obtained from the data frame, for example,indicating the ith receiving antenna to the kth receiving antenna on the kth subcarrierChannel information of j transmit antennas. And the receiving end carries the channel information of each subcarrier in a feedback message and sends the feedback message to the sending end.
After acquiring the channel information of each subcarrier, the transmitting end uses a maximum ratio combining mode to make the channels from two receiving antennas to the same transmitting antenna equivalent to one channel, namelyThe formula for selecting the highest signal strength of different transceiving antenna pairs on the kth subcarrier can be expressed as max ( | H 1 k | 2 , | H 2 k | 2 , ( | H 1 k + H 2 k | 2 / 2 ) ) , Wherein, | H 1 k | 2 indicating that the k sub-carrier is in twoThe signal strength on the equivalent channel from the receive antenna to the 1 st transmit antenna,represents the signal strength of the kth sub-carrier on the equivalent channel from the two receive antennas to the 2 nd transmit antenna,and representing the signal strength of the kth subcarrier on the equivalent channel from the two receiving antennas to the 1 st transmitting antenna and the average value of the signal strengths of the equivalent channels from the two receiving antennas to the 2 nd transmitting antenna, and selecting the transmitting antenna in the transceiving antenna pair with the maximum signal strength as the target transmitting antenna of the kth subcarrier.
According to the channel coherence bandwidth, adjacent subcarriers are divided into subcarrier blocks, each subcarrier block needs 2 bits to represent the receiving condition of a receiving antenna, for example, 10 represents the reception of the 1 st receiving antenna, 01 represents the reception of the 2 nd receiving antenna, and 11 represents the simultaneous reception of the 1 st and the 2 nd receiving antennas. When there are 52 subcarriers in 802.11ah at 2MHz, a 52bit bitmap is needed to indicate subcarrier allocation, and thus 104 bits are needed to indicate the reception of the subcarriers. When 52 sub-carriers are divided into four sub-carrier blocks, and each sub-carrier block comprises 13 continuous sub-carriers, 8 bits are used for representing the receiving condition of the receiving antenna of the 4 sub-carrier blocks, thereby saving the feedback overhead.
And when the receiving end calculates the channel information according to the NDP sent by the sending end, the feedback information is a CSI frame according to the existing NDP measurement feedback process.
When the receiving end performs channel information calculation according to the normal frame sent by the sending end, the channel information needs to be carried in the feedback message corresponding to the normal frame.
The feedback message may include a CSI frame, an ACK frame, a block ACK frame, a short block frame, or other frames.
The physical layer carrying position of the feedback message may be a data field (data field) of an acknowledgement frame (ACK frame), or a data field (datafield) of a Block acknowledgement feedback frame (Block ACK frame), or a signal field (SIG field) of a short acknowledgement frame (short ACK frame), or a signal field (SIG field) of a short Block acknowledgement feedback frame (short Block ACK frame), a MAC control frame, a MAC management frame, a data field and/or a signal field of a normal data frame, etc.
And sending the data in a sub-carrier block, wherein the sub-carrier block comprises a pilot symbol, so that the receiving end can correct the channel of the sub-carrier block when receiving the sub-carrier block carrying the pilot symbol, and the sub-carrier block is correctly obtained. Joint interpolation may be considered when adjacent subcarrier blocks are from the same target transmit antenna. When the position of the pilot frequency symbol changes periodically with time, the correction is only carried out when the pilot frequency symbol exists in the continuous sub-carrier block from the same target transmitting antenna, and if the pilot frequency symbol does not exist in the continuous sub-carrier block where the same target transmitting antenna exists, the channel estimation correction is carried out by utilizing the pilot frequency symbol in the previous sub-carrier block.
Through the implementation mode, on the premise of not increasing the transmitting power, the better the channel quality is, the higher the received signal power is, and the channel estimation performance of each subcarrier is improved.
An embodiment of the present invention provides a terminal 40, as shown in fig. 4, including an obtaining unit 41, a first processing unit 42, and a second processing unit 43.
An obtaining unit 41, configured to obtain channel information of each subcarrier, where the channel information is a signal strength of each subcarrier received on a channel between different transceiver antenna pairs;
a first processing unit 42, configured to determine, according to the channel information of each subcarrier, that a transmitting antenna corresponding to a transmitting-receiving antenna pair with an optimal performance index in the transmitting-receiving antenna pair of each subcarrier is a target transmitting antenna, where the target transmitting antenna is used to transmit the corresponding subcarrier;
the second processing unit 43 is configured to divide the subcarriers that are the same and adjacent to the target transmitting antenna into a subcarrier block, and include a pilot symbol in the subcarrier block, so as to transmit the corresponding subcarrier block carrying the pilot symbol through the target transmitting antenna.
The embodiment of the invention provides a terminal, which is characterized in that channel information of each subcarrier is obtained, the channel information is the signal strength of each subcarrier received on a channel between different transceiving antenna pairs, a transmitting antenna corresponding to a transceiving antenna pair with the optimal performance index in the transceiving antenna pair of each subcarrier is determined as a target transmitting antenna according to the channel information of each subcarrier, the target transmitting antenna is used for transmitting the corresponding subcarrier, then the same and adjacent subcarriers of the target transmitting antenna are divided into a subcarrier block, and the subcarrier block comprises a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol can be transmitted through the target transmitting antenna. The embodiment of the invention solves the problem that the receiving end can not accurately carry out channel estimation after receiving the sub-carriers because the adjacent sub-carriers can come from different transmitting antennas in the prior art, so that the sub-carriers can not be correctly received, and improves the channel estimation performance of each sub-carrier.
Optionally, as shown in fig. 5, the first processing unit 42 includes:
a first processing module 51, configured to calculate first equivalent channel information of each subcarrier according to a maximum ratio combination, where the first equivalent channel information is equivalent channel information between each transmitting antenna and different receiving antennas;
the second processing module 52 is configured to determine a transmitting antenna corresponding to the maximum value in the first equivalent channel information as a target transmitting antenna.
Optionally, as shown in fig. 6, the first processing unit 42 includes:
a third processing module 61, configured to calculate a signal-to-noise ratio of a channel between each transmitting antenna and a different receiving antenna of each subcarrier;
a fourth processing module 62, configured to use a maximum value in the signal-to-noise ratio as a performance index of a corresponding transmitting antenna;
a fifth processing module 63, configured to determine a transmitting antenna corresponding to the maximum value in the performance index as a target transmitting antenna.
Optionally, when the terminal is a receiving end, as shown in fig. 7, the obtaining unit 41 includes:
a receiving module 71, configured to receive a data frame sent by a sending end, where the data frame includes a pilot signal of each subcarrier;
a determining module 72, configured to determine the channel information of each subcarrier according to the pilot signal.
Optionally, as shown in fig. 8, the terminal further includes:
a first sending unit 44, configured to send a first feedback message carrying indication information to the sending end, where the indication information is used to indicate the division of the subcarrier blocks, and the sending end sends the target transmit antenna of each subcarrier block.
Optionally, when the terminal is a sending end, the obtaining unit is specifically configured to obtain a second feedback message sent by the receiving end, and obtain channel information of each subcarrier from the second feedback message.
Optionally, as shown in fig. 9, the terminal further includes:
a second sending unit 45, configured to send a third feedback message to the receiving end, where the third feedback message includes receiving antenna indication information, and is used to notify the receiving end to receive the designated receiving antenna of each subcarrier block.
The operation of the terminal 40 is as described above with reference to the processing of the antenna selection method.
An embodiment of the present invention provides a terminal, as shown in fig. 10, where the terminal 10 includes a memory 1001, a transceiver 1002, and a processor 1003.
The memory 1001 is used for storing instructions and channel information;
a transceiver 1002 for receiving or transmitting channel information, and a feedback message;
the processor 1003 is configured to execute the instructions in the memory 1001, and specifically execute:
acquiring channel information of each subcarrier, wherein the channel information is the signal strength of each subcarrier received on a channel between different transceiving antenna pairs;
determining a transmitting antenna corresponding to the transmitting-receiving antenna pair with the optimal performance index in the transmitting-receiving antenna pair of each subcarrier as a target transmitting antenna according to the channel information of each subcarrier, wherein the target transmitting antenna is used for transmitting the corresponding subcarrier;
dividing the same and adjacent subcarriers of a target transmitting antenna into a subcarrier block, wherein the subcarrier block comprises a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol is transmitted through the target transmitting antenna.
The embodiment of the invention provides a terminal, which is characterized in that channel information of each subcarrier is obtained, the channel information is the signal strength of each subcarrier received on a channel between different transceiving antenna pairs, a transmitting antenna corresponding to a transceiving antenna pair with the optimal performance index in the transceiving antenna pair of each subcarrier is determined as a target transmitting antenna according to the channel information of each subcarrier, the target transmitting antenna is used for transmitting the corresponding subcarrier, then the same and adjacent subcarriers of the target transmitting antenna are divided into a subcarrier block, and the subcarrier block comprises a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol can be transmitted through the target transmitting antenna. The embodiment of the invention solves the problem that the receiving end can not accurately carry out channel estimation after receiving the sub-carriers because the adjacent sub-carriers can come from different transmitting antennas in the prior art, so that the sub-carriers can not be correctly received, and improves the channel estimation performance of each sub-carrier.
Optionally, the processor 1003 is further configured to execute:
calculating first equivalent channel information of each subcarrier according to the maximum ratio combination, wherein the first equivalent channel information is equivalent channel information between each transmitting antenna and different receiving antennas;
and determining the transmitting antenna corresponding to the maximum value in the first equivalent channel information as a target transmitting antenna.
Optionally, the processor 1003 is further configured to execute:
calculating the signal-to-noise ratio of the channel between each transmitting antenna and different receiving antennas of each subcarrier;
taking the maximum value in the signal-to-noise ratio as a performance index of a corresponding transmitting antenna;
and determining the transmitting antenna corresponding to the maximum value in the performance index as a target transmitting antenna.
Optionally, when the terminal is a receiving end, the processor 1003 is further configured to execute:
receiving a data frame sent by a sending end through the transceiver 1002, where the data frame includes a pilot signal of each subcarrier;
and determining the channel information of each subcarrier according to the pilot signal.
Optionally, the processor 1003 is further configured to execute:
sending a first feedback message carrying indication information to the sending end through the transceiver 1002, where the indication information is used to indicate the division of the subcarrier blocks, and the sending end sends the target transmitting antenna of each subcarrier block.
Optionally, when the terminal is a sending end, the processor 1003 is further configured to execute:
a second feedback message sent by a receiving end is obtained through the transceiver 1002, and channel information of each subcarrier is obtained from the second feedback message.
Optionally, the processor 1003 is further configured to execute:
and sending a third feedback message to the receiving end through the transceiver 1002, where the third feedback message includes receiving antenna indication information for notifying the receiving end to receive the designated receiving antenna of each subcarrier block.
The operation of the terminal 10 is as described above with reference to the processing of the method for antenna selection.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (16)

1. A method of antenna selection, comprising:
acquiring channel information of each subcarrier, wherein the channel information is the signal strength of each subcarrier received on a channel between different transceiving antenna pairs;
determining a transmitting antenna corresponding to the transmitting-receiving antenna pair with the optimal performance index in the transmitting-receiving antenna pair of each subcarrier as a target transmitting antenna according to the channel information of each subcarrier, wherein the target transmitting antenna is used for transmitting the corresponding subcarrier;
dividing the same and adjacent subcarriers of a target transmitting antenna into a subcarrier block, wherein the subcarrier block comprises a pilot symbol, so that the corresponding subcarrier block carrying the pilot symbol is transmitted through the target transmitting antenna.
2. The method of claim 1, wherein the determining, according to the channel information of each subcarrier, a transmitting antenna corresponding to a transmitting-receiving antenna pair with an optimal performance index among the transmitting-receiving antenna pairs of each subcarrier as a target transmitting antenna comprises:
calculating first equivalent channel information of each subcarrier according to the maximum ratio combination, wherein the first equivalent channel information is equivalent channel information between each transmitting antenna and different receiving antennas;
and determining the transmitting antenna corresponding to the maximum value in the first equivalent channel information as a target transmitting antenna.
3. The method of claim 1, wherein the determining, according to the channel information of each subcarrier, a transmitting antenna corresponding to a transmitting-receiving antenna pair with an optimal performance index among the transmitting-receiving antenna pairs of each subcarrier as a target transmitting antenna comprises:
calculating the signal-to-noise ratio of the channel between each transmitting antenna and different receiving antennas of each subcarrier;
taking the maximum value in the signal-to-noise ratio as a performance index of a corresponding transmitting antenna;
and determining the transmitting antenna corresponding to the maximum value in the performance index as a target transmitting antenna.
4. The method of claim 2 or 3, wherein when the terminal is a receiving end, the obtaining the channel information of each subcarrier comprises:
receiving a data frame sent by a sending end, wherein the data frame comprises a pilot signal of each subcarrier;
and determining the channel information of each subcarrier according to the pilot signal.
5. The method of antenna selection according to claim 4, wherein the method comprises:
and sending a first feedback message carrying indication information to the sending end, wherein the indication information is used for indicating the division of the subcarrier blocks, and the sending end sends the target transmitting antenna of each subcarrier block.
6. The method of claim 2 or 3, wherein when the terminal is a transmitting end, the obtaining the channel information of each subcarrier comprises:
and acquiring a second feedback message sent by a receiving end, and acquiring the channel information of each subcarrier from the second feedback message.
7. The method of antenna selection according to claim 6, further comprising:
and sending a third feedback message to the receiving end, wherein the third feedback message comprises receiving antenna indication information and is used for informing the receiving end of receiving the appointed receiving antenna of each subcarrier block.
8. The method of antenna selection according to claim 5 or 7, wherein the performance indicator is a signal strength or a signal-to-noise ratio of a channel between the pair of transceiving antennas.
9. A terminal, comprising:
an obtaining unit, configured to obtain channel information of each subcarrier, where the channel information is a signal strength of each subcarrier received on a channel between different transceiver antenna pairs;
a first processing unit, configured to determine, according to the channel information of each subcarrier, that a transmitting antenna corresponding to a transmitting-receiving antenna pair with an optimal performance index among the transmitting-receiving antenna pairs of each subcarrier is a target transmitting antenna, where the target transmitting antenna is used to transmit the corresponding subcarrier;
and the second processing unit is used for dividing the subcarriers which are the same as and adjacent to the target transmitting antenna into a subcarrier block, and the subcarrier block comprises a pilot symbol so as to transmit the corresponding subcarrier block carrying the pilot symbol through the target transmitting antenna.
10. The terminal of claim 9, wherein the first processing unit comprises:
a first processing module, configured to calculate first equivalent channel information of each subcarrier according to a maximum ratio combination, where the first equivalent channel information is equivalent channel information between each transmitting antenna and different receiving antennas;
and the second processing module is used for determining the transmitting antenna corresponding to the maximum value in the first equivalent channel information as a target transmitting antenna.
11. The terminal of claim 9, wherein the first processing unit comprises:
a third processing module, configured to calculate a signal-to-noise ratio of a channel between each transmitting antenna and a different receiving antenna of each subcarrier;
the fourth processing module is used for taking the maximum value in the signal-to-noise ratio as the performance index of the corresponding transmitting antenna;
and the fifth processing module is used for determining the transmitting antenna corresponding to the maximum value in the performance index as a target transmitting antenna.
12. The terminal according to claim 10 or 11, wherein when the terminal is a receiving end, the obtaining unit comprises:
a receiving module, configured to receive a data frame sent by a sending end, where the data frame includes a pilot signal of each subcarrier;
a determining module, configured to determine the channel information of each subcarrier according to the pilot signal.
13. The terminal of claim 12, wherein the terminal further comprises:
a first sending unit, configured to send a first feedback message carrying indication information to the sending end, where the indication information is used to indicate the division of the subcarrier blocks, and the sending end sends the target transmit antenna of each subcarrier block.
14. The terminal according to claim 10 or 11, wherein when the terminal is a transmitting end, the obtaining unit is specifically configured to obtain a second feedback message sent by a receiving end, and obtain channel information of each subcarrier from the second feedback message.
15. The terminal of claim 14, wherein the terminal further comprises:
a second sending unit, configured to send a third feedback message to the receiving end, where the third feedback message includes receiving antenna indication information, and is used to notify the receiving end to receive the designated receiving antenna of each subcarrier block.
16. A terminal according to claim 13 or 15, wherein the performance indicator in the first processing unit is the signal strength or signal to noise ratio of the channel between the transceiving antenna pairs.
CN201310177782.1A 2013-05-14 2013-05-14 Method and device for antenna selection Pending CN104158579A (en)

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CN1710826A (en) * 2005-07-27 2005-12-21 北京邮电大学 Method for selecting send-antenna through closed-loop control in multi-antenna system
CN101005303A (en) * 2006-01-18 2007-07-25 中兴通讯股份有限公司 Moulding method for transmitting antenna selection and adaption in multiple input and multiple output orthogenal frequency division multiplex system
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CN106169940A (en) * 2015-05-21 2016-11-30 北京大学 X-Duplex: duplex communication flexibly
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