WO2016161766A1 - Channel information determination method and apparatus - Google Patents

Abstract

Provided are a channel information determination method and apparatus, the method comprising: sending a channel detection request frame to a station (STA), wherein the channel detection request frame is used to request for the sending of a channel detection signal to the STA, and the channel detection request frame carries a system frame number (SFN) used to determine an orthogonal codeword index value and/or a subcarrier index location configured on each antenna of an access point (AP); and sending a channel detection signal frame to the STA, wherein the channel detection signal frame carries the channel detection signal, and the orthogonal codeword index value and/or the subcarrier index location and the channel detection signal are used to determine channel information between the station (STA) and the AP. By means of the present invention, the problem in the related art that channel detection efficiency is low is solved, thereby achieving the effect of improving the channel detection efficiency.

Description

Method and device for determining channel information Technical field

The present invention relates to the field of communications, and in particular to a method and apparatus for determining channel information.

Background technique

The traditional wireless local area network (WLAN) channel detection is performed in a full bandwidth manner, that is, each antenna transmits all bandwidth subcarriers, and the antennas are isolated by using an orthogonal matrix. Multiple antennas need multiple orthogonalities. Orthogonal Frequency Division Multiplexing (OFDM) symbols are used for detection, and the efficiency of detection is low in the case of multiple antennas.

In view of the problem of low channel detection efficiency existing in the related art, an effective solution has not been proposed yet.

Summary of the invention

The present invention provides a method and apparatus for determining channel information to at least solve the problem of low channel detection efficiency existing in the related art.

According to an aspect of the present invention, a method for determining channel information is provided, comprising: transmitting a channel sounding request frame to a station STA, wherein the channel sounding request frame is configured to request to send a channel sounding signal to the STA, The channel sounding request frame carries a system frame number SFN for determining an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the access point AP; and sending the channel sounding signal frame to the STA, The channel sounding signal frame carries the channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal are used to determine the station STA Channel information with the AP.

Optionally, sending the channel sounding signal frame to the STA includes: following a predetermined time interval after the channel sounding request frame is sent, according to an orthogonal codeword configured on each antenna of the AP The STA transmits the channel sounding signal frame.

Optionally, the method further includes: determining, according to the SFN, an index value in an orthogonal code block corresponding to each antenna; grouping according to the index value in the orthogonal code block and a predetermined orthogonal codeword group The index value determines an orthogonal codeword index value corresponding to the orthogonal codeword.

Optionally, determining, according to the SFN, an index value in an orthogonal codeword group corresponding to each antenna includes: determining an index value Ci in the orthogonal codeword group by using a formula: Ci=mod(nka+SFN, Ka ), where nka is the place For each antenna index value of the AP, Ka is the number of antennas of the AP.

Optionally, the sending, by the STA, the channel sounding signal frame includes: after the predetermined time interval after the channel sounding request frame is sent, transmitting, according to each antenna of the AP, the channel sounding The channel sounding signal frame is transmitted at an index position of a subcarrier of the signal.

Optionally, the method further includes: determining a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP; determining an index offset Δf according to the SFN; The number of subcarriers, the Δf, and the number of transmitted symbols corresponding to the channel sounding signal determine the subcarrier index position configured on each antenna of the AP.

Optionally, the Δf is obtained by: Δf=mod(SFN, SC _BW ), where the SC _BW is a total number of subcarriers allocated to each antenna of the AP; the subcarrier index position Obtained by the following formula: ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where Ka is the number of antennas of the AP, and ti is the transmission symbol Number index and ti=0,1,2...,k is the subcarrier index position and the value range of k is [0, SC _BW -1], ki is the corresponding allocated ith antenna and Ki=i.

Optionally, determining the number of subcarriers configured to send the channel sounding signal frame configured on each antenna of the AP includes: determining, by using the following formula, the number of the subcarriers configured on each antenna:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

According to another aspect of the present invention, a method for determining channel information is provided, comprising: receiving an access point AP to transmit a channel sounding request frame, wherein the channel sounding request frame is configured to request to send a channel sounding signal, the channel The probe request frame carries a system frame number SFN, and receives a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries the channel sounding signal; and determining, according to the SFN, each antenna of the AP Orthogonal codeword index value and/or subcarrier index position configured; determining, by the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal, the station STA and the AP Channel information between.

Optionally, receiving the channel sounding signal frame sent by the AP includes: after receiving the predetermined time interval after the AP sends the channel sounding request frame, according to the positive configuration configured on each antenna of the AP The channel sounding signal frame transmitted by the code word.

Optionally, determining, according to the SFN, the orthogonal codeword index value configured on each antenna port of the AP, determining, according to the SFN, an index value of an orthogonal codeword group corresponding to each antenna; The orthogonal codeword group index value and the pre-received orthogonal codeword grouping of the channel sounding of the AP sent by the AP The index determines the orthogonal codeword index value.

Optionally, determining, according to the SFN, the index value in the orthogonal codeword group corresponding to each antenna includes: determining an index value Ci in the orthogonal codeword group by using a formula: Ci=mod(nka+SFN) , Ka), where nka is the respective antenna index value of the AP, and Ka is the number of antennas of the AP.

Optionally, receiving the channel sounding signal frame sent by the AP, after receiving the predetermined time interval after the AP sends the channel sounding request frame, configured according to each antenna configured on the AP The channel sounding signal frame transmitted by the index position of the subcarrier transmitting the channel sounding signal.

Optionally, determining the subcarrier index position configured on each antenna of the AP according to the SFN includes: determining a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP; Determining, by the SFN, an index offset Δf; determining, according to the determined number of the subcarriers, the Δf, and the number of transmitted symbols corresponding to the channel sounding signal sent by the AP, determining configuration on each antenna of the AP The subcarrier index position.

Optionally, the Δf is obtained by: Δf=mod(SFN, SC _BW ), where the SC _BW is a total number of subcarriers allocated to each antenna of the AP; the subcarrier index position Obtained by the following formula: ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where ti is the index of the transmitted symbols and ti=0, 1, 2 ..., k is the subcarrier index position and the value range of k is [0, SC _BW -1], ki is the corresponding allocated ith antenna and ki=i.

Optionally, determining the number of subcarriers configured to send the channel sounding signal frame configured on each antenna of the AP includes: determining, by using the following formula, the number of the subcarriers configured on each antenna:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

Optionally, determining channel information between the STA and the AP according to the subcarrier index position and the channel sounding signal includes: according to each antenna of the AP received at the subcarrier index position The channel sounding signal estimates channel information between the STA and the AP; and determines channel information between the STA and the AP by performing interpolation processing on the result of the estimation.

According to another aspect of the present invention, there is provided apparatus for determining channel information, comprising: a first transmitting module configured to transmit a channel sounding request frame to a station STA, wherein the channel sounding request frame is used to request to The STA sends a channel sounding request signal, where the channel sounding request frame carries a system frame number SFN for determining an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the access point AP; ,Assume And sending the channel sounding signal frame to the STA, where the channel sounding signal frame carries the channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position And the channel sounding signal is used to determine channel information between the station STA and the AP.

Optionally, the second sending module includes: after the predetermined time interval after the channel sounding request frame is sent, the sending to the STA according to an orthogonal codeword configured on each antenna of the AP Channel sounding signal frame.

Optionally, the device further includes: a first determining module, configured to determine, according to the SFN, an index value of an orthogonal code block group corresponding to each antenna; and a second determining module, configured to be according to the orthogonal code The intra-word index value and the predetermined orthogonal codeword packet index value determine an orthogonal codeword index value corresponding to the orthogonal codeword.

Optionally, the first determining module includes: determining, according to a formula, an index value Ci: Ci=mod(nka+SFN, Ka) in the orthogonal codeword group, where nka is an antenna index of the AP Value, Ka is the number of antennas of the AP.

Optionally, the second sending module includes: after a predetermined time interval after the channel sounding request frame is sent, according to the subcarriers configured to transmit the channel sounding signal configured on each antenna of the AP The channel sounding signal frame transmitted by the index position.

Optionally, the device further includes: a third determining module, configured to determine a number of subcarriers configured to send the channel sounding signal frame configured on each antenna of the AP; and a fourth determining module, configured to The SFN determines an index offset Δf; the fifth determining module is configured to determine, according to the determined number of the subcarriers, the Δf, and the number of transmitted symbols corresponding to the channel sounding signal, each antenna of the AP is determined. The subcarrier index position configured on.

Optionally, the Δf is obtained by: Δf=mod(SFN, SC _BW ), where the SC _BW is a total number of subcarriers allocated to each antenna of the AP; the subcarrier index position Obtained by the following formula: ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where Ka is the number of antennas of the AP, and ti is the transmission symbol Number index and ti=0,1,2...,k is the subcarrier index position and the value range of k is [0, SC _BW -1], ki is the corresponding allocated ith antenna and Ki=i.

Optionally, the third determining module includes: determining, by using the following formula, the number of the subcarriers configured on each antenna:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

According to another aspect of the present invention, a device for determining channel information includes: a first receiving module, The channel sounding request frame is configured to receive a channel sounding request frame, where the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries a system frame number SFN; a receiving module, configured to receive a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries the channel sounding signal; and a sixth determining module, configured to determine each of the APs according to the SFN An orthogonal codeword index value and/or a subcarrier index position configured on the antenna; a seventh determining module configured to be based on the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal Determining channel information between the STA and the AP.

Optionally, the second receiving module includes: after receiving the predetermined time interval after the AP sends the channel sounding request frame, according to the orthogonal codeword configured on each antenna of the AP, The channel sounding signal frame.

Optionally, when determining the orthogonal codeword index value configured on each antenna port of the AP according to the SFN, the sixth determining module includes: a first determining unit, configured to determine according to the SFN The index value of the orthogonal code block group corresponding to each antenna; the second determining unit is configured to detect according to the index value in the orthogonal code block group and the channel channel of the AP that is sent by the AP and received in advance The orthogonal codeword packet index value determines the orthogonal codeword index value.

Optionally, the first determining unit includes: determining, according to a formula, an index value Ci: Ci=mod(nka+SFN, Ka) in the orthogonal codeword group, where nka is each antenna index of the AP Value, Ka is the number of antennas of the AP.

Optionally, the second receiving module includes: after receiving the predetermined time interval after the AP sends the channel sounding request frame, configured to send the channel sounding signal according to each antenna configured on the AP The channel sounding signal frame transmitted by the index position of the subcarrier.

Optionally, when determining a subcarrier index position configured on each antenna of the AP according to the SFN, the sixth determining module includes: a third determining unit, configured to determine configuration on each antenna of the AP a number of subcarriers for transmitting the channel sounding signal frame; a fourth determining unit configured to determine an index offset Δf according to the SFN; and a fifth determining unit, configured to determine, according to the determined number of the subcarriers, The Δf and the number of transmitted symbols corresponding to the channel sounding signal sent by the AP determine the subcarrier index position configured on each antenna of the AP.

Optionally, the Δf is obtained by: Δf=mod(SFN, SC _BW ), where the SC _BW is a total number of subcarriers allocated to each antenna of the AP; the subcarrier index position Obtained by the following formula: ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where ti is the index of the transmitted symbols and ti=0, 1, 2 ..., k is the subcarrier index position and the range of k is [0, SC _BW -1], ki is the corresponding ith antenna and ki = i.

Optionally, the third determining unit includes: determining, by using the following formula, the number of the subcarriers configured on each antenna:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

Optionally, when determining channel information between the STA and the AP according to the subcarrier index position and the channel sounding signal, the seventh determining module includes: an estimating unit, configured to A channel sounding signal of each antenna of the AP received at a subcarrier index position estimates channel information between the STA and the AP; a sixth determining unit is configured to perform interpolation processing on a result of the estimation The manner of determining channel information between the STA and the AP.

According to the present invention, a channel sounding request frame is sent to a station STA, wherein the channel sounding request frame is used to request to send a channel sounding signal to the STA, where the channel sounding request frame carries an identifier for determining an access point AP. a system frame number SFN of an orthogonal codeword index value and/or a subcarrier index position configured on each antenna; transmitting the channel sounding signal frame to the STA, wherein the channel sounding signal frame carries the channel a detection signal; wherein the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal are used to determine channel information between the station STA and the AP, and the related art is solved The problem of low channel detection efficiency exists, and the effect of improving channel detection efficiency is achieved.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a flowchart of a method for determining a first type of channel information according to an embodiment of the present invention;

2 is a flowchart of a method for determining second channel information according to an embodiment of the present invention;

3 is a structural block diagram of a first apparatus for determining channel information according to an embodiment of the present invention;

4 is a block diagram 1 of a preferred structure of a first apparatus for determining channel information according to an embodiment of the present invention;

FIG. 5 is a second structural block diagram of a first apparatus for determining channel information according to an embodiment of the present invention; FIG.

6 is a structural block diagram of a second apparatus for determining channel information according to an embodiment of the present invention;

FIG. 7 is a structural block diagram 1 of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention;

FIG. 8 is a second structural block diagram of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention;

FIG. 9 is a structural block diagram of a seventh determining module 68 in a second channel information determining apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a downlink channel sounding process according to an embodiment of the present invention; FIG.

FIG. 11 is a schematic diagram of frequency domain resource spacing allocation according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

A method for determining channel information is provided in this embodiment. FIG. 1 is a flowchart of a method for determining channel information according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:

Step S102: Send a channel sounding request frame to the station STA, where the channel sounding request frame is used to request to send a channel sounding signal to the STA, where the channel sounding request frame carries a positive configuration on each antenna for determining the access point AP. The system frame number (SFN) of the codeword index value and/or the subcarrier index position;

Step S104: Send a channel sounding signal frame to the STA, where the channel sounding signal frame carries a channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal are used to determine the station. Channel information between the STA and the AP.

Through the foregoing steps, the channel information is determined according to the orthogonal codeword index value and/or the subcarrier index position and the channel sounding information, so that the channel information of the full-bandwidth full antenna can be effectively obtained by a single training symbol or the frequency domain and the time domain can be improved. The diversity gain, thereby improving the efficiency of acquiring channel information, and determining the channel condition based on the acquired channel information, for example, the channel quality, thereby improving the efficiency of channel sounding. Therefore, the problem of low channel detection efficiency existing in the related art is solved, thereby achieving the effect of improving channel detection efficiency.

When the channel sounding signal frame is sent to the STA, there may be multiple transmission modes. In an optional embodiment, the orthogonal time may be configured according to each antenna of the AP after a predetermined time interval after the channel sounding request frame is sent. The codeword sends a channel sounding signal frame to the STA, and the predetermined time interval may be a short interframe spacing interval.

In an optional embodiment, the orthogonal codeword may also be determined, including: determining, according to the SFN, an index value in an orthogonal code block corresponding to each antenna; according to an index value in the orthogonal code block and a predetermined orthogonality The codeword packet index value determines an orthogonal codeword index value corresponding to the orthogonal codeword. Further, the channel sounding signal is transmitted according to the orthogonal codewords configured on the respective antennas.

When determining the index value in the orthogonal codeword group corresponding to each antenna according to the SFN, the index value Ci:Ci=mod(nka+SFN, Ka) in the orthogonal codeword group may be determined by using the following formula, where nka is each AP Antenna index value, where Ka is the number of antennas of the AP.

In another optional embodiment, the sending the channel sounding signal frame to the STA may include: following a predetermined time interval after the channel sounding request frame is sent, according to the sub-configurant for transmitting the channel sounding signal configured on each antenna of the AP. The index position of the carrier transmits a channel sounding signal frame, and the predetermined time interval may be a short inter-frame spacing interval.

Correspondingly, the foregoing method further includes acquiring an index position of the subcarrier. In an optional embodiment, the channel for detecting the channel may be configured according to each antenna of the AP after a predetermined time interval after the channel probe request frame is sent. The index position of the subcarrier of the signal is obtained before the channel sounding signal is sent. The subcarrier index position is obtained. The subcarrier index position may be acquired at other times. The index position of the subcarrier is obtained by determining the channel for transmitting on each antenna of the AP. Determining the number of subcarriers of the signal frame; determining the index offset Δf according to the SFN; determining the subcarrier index configured on each antenna of the AP according to the determined number of subcarriers, Δf, and the number of transmitted symbols corresponding to the channel sounding signal position.

The above Δf can be obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated by each antenna of the AP; the subcarrier index position can be obtained by the following formula: Ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where Ka is the number of antennas of the AP, ti is the number of transmitted symbols and ti=0,1, 2..., k is the subcarrier index position and k has a value range of [0, SC _BW -1], ki is the corresponding assigned ith antenna and ki=i.

The number of subcarriers configured on each antenna may be determined by using the following formula:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

FIG. 2 is a flowchart of a method for determining second channel information according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202, receiving a channel sounding request frame sent by the access point AP, wherein the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries the system frame number SFN;

Step S204, receiving a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries a channel sounding signal;

Step S206, determining, according to the SFN, an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the AP;

Step S208, determining channel information between the station STA and the AP according to the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal.

Through the above steps, when determining the channel information between the STA and the AP, it may be determined according to the orthogonal codeword index value and/or the subcarrier index position and the channel sounding information, and the single training symbol can be effectively obtained to obtain the full bandwidth. The channel information of the antenna or the diversity gain in the frequency domain and the time domain is improved, thereby improving the efficiency of acquiring channel information, thereby improving the efficiency of channel sounding. Therefore, the problem of low channel detection efficiency existing in the related art is solved, thereby achieving the effect of improving channel detection efficiency.

The channel sounding signal frame sent by the receiving AP may have multiple receiving modes. In an optional embodiment, the receiving AP may be configured on each antenna of the AP after a predetermined time interval after the channel probe request frame is sent. The channel sounding signal frame transmitted by the orthogonal codeword may be a short interframe spacing interval.

In determining the orthogonal codeword index value, there may be multiple determining manners. In an optional embodiment, determining the orthogonal codeword index value configured on each antenna port of the AP according to the SFN includes: determining according to the SFN. An index value in an orthogonal code block corresponding to each antenna; an orthogonal codeword index value is determined according to an index value in the orthogonal code block and an orthogonal codeword packet index value of the channel sounding of the AP transmitted by the AP received in advance. The pre-received orthogonal codeword packet index value may be sent to the STA by the AP in advance through the beacon frame or by other means.

In an optional embodiment, determining, according to the SFN, an index value in an orthogonal code block corresponding to each antenna includes: determining an index value Ci in the orthogonal code block by using the following formula: Ci=mod(nka+SFN, Ka) Where nka is the antenna index value of the AP and Ka is the number of antennas of the AP. The antenna index and the number of antennas can also be obtained by receiving the broadcast of the AP.

In another optional embodiment, when receiving the channel sounding signal frame sent by the AP, the receiving AP may be configured to send according to each antenna configured on the antenna after the predetermined time interval after the channel sounding request frame is sent. A channel sounding signal frame transmitted by an index position of a subcarrier of the channel sounding signal, and the predetermined time interval may be a short interframe space interval.

In an optional embodiment, determining, according to the SFN, a subcarrier index position configured on each antenna of the AP includes: determining a number of subcarriers configured to transmit a channel sounding signal frame configured on each antenna of the AP; determining an index according to the SFN Offset Δf; determining the subcarrier index position configured on each antenna of the AP according to the determined number of subcarriers, Δf, and the number of transmitted symbols corresponding to the channel sounding signal transmitted by the AP.

The above Δf can be obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated by each antenna of the AP; the subcarrier index position can be obtained by the following formula: Ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where ti is the number of transmitted symbols and ti=0,1,2...,k is a sub The carrier index position and k have a value range of [0, SC _BW -1], ki is the corresponding allocated ith antenna and ki=i.

The determining the number of subcarriers for transmitting the channel sounding signal frame configured on each antenna of the AP includes: determining the number of subcarriers configured on each antenna by using the following formula:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

In an optional embodiment, determining channel information between the station STA and the AP according to the subcarrier index position and the channel sounding signal comprises: pairing the STA according to the channel sounding signal of each antenna of the AP received at the subcarrier index position The channel information between the AP and the AP is determined by performing channel interpolation on the estimated result.

In the present embodiment, a device for determining the channel information is provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 3 is a structural block diagram of a first apparatus for determining channel information according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes a first transmitting module 32 and a second transmitting module 34. The apparatus will be described below.

The first sending module 32 is configured to send a channel sounding request frame to the station STA, where the channel sounding request frame is used to request to send a channel sounding signal to the STA, where the channel sounding request frame carries each of the determining access point APs. a system frame number SFN of the orthogonal codeword index value and/or the subcarrier index position configured on the antenna; the second sending module 34 is connected to the first sending module 32, and configured to send a channel sounding signal frame to the STA, where The channel sounding signal frame carries a channel sounding signal; wherein the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal are used to determine channel information between the station STA and the AP.

In an optional embodiment, the foregoing second sending module 34 includes: a channel sounding signal sent to the STA according to an orthogonal codeword configured on each antenna of the AP after a predetermined time interval after the channel sounding request frame is transmitted. The frame, the predetermined time interval may be a short interframe spacing interval.

4 is a block diagram of a preferred structure of a first channel information determining apparatus according to an embodiment of the present invention. As shown in FIG. 4, the apparatus includes a first determining module 42 and all but the modules shown in FIG. The second determining module 44, it should be noted that the positional relationship between the first determining module 42 and the second determining module 44 and each module in FIG. 3 may be multiple, and the index value in the orthogonal codeword group is determined first. The orthogonal codeword index value is sent to the STA as an example for description.

The first determining module 42 is configured to determine an index value of the orthogonal code block group corresponding to each antenna according to the SFN; the second determining module 44 is connected to the first determining module 42 and the second sending module 34, and is configured to be orthogonal according to the orthogonality code The intra-word index value and the predetermined orthogonal codeword packet index value determine an orthogonal codeword index value corresponding to the orthogonal codeword.

In an optional embodiment, the foregoing first determining module 42 includes: determining an index value Ci:Ci=mod(nka+SFN, Ka) in the orthogonal codeword group by using the following formula, where nka is each antenna of the AP Index value, where Ka is the number of antennas of the AP.

The foregoing second sending module 34 may include: a channel sounding signal frame that is sent according to an index position of a subcarrier for transmitting a channel sounding signal configured on each antenna of the AP after a predetermined time interval after the channel sounding request frame is transmitted. The predetermined time interval may be a short interframe spacing interval.

5 is a block diagram of a preferred structure of a first channel information determining apparatus according to an embodiment of the present invention. As shown in FIG. 5, the apparatus includes a third determining module 52, in addition to all the modules shown in FIG. The fourth determining module 54 and the fifth determining module 56, it should be noted that the positional relationship between the third determining module 52, the fourth determining module 54, and the fifth determining module 56 and each module in FIG. 3 may be multiple. The index offset and the subcarrier index position are determined by determining the number of subcarriers first, and then the channel sounding signal frame is sent to the STA as an example for description.

The third determining module 52 is configured to determine the number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP, and the fourth determining module 54 is connected to the third determining module 52, and is configured to determine an index according to the SFN. The fifth determining module 56 is connected to the fourth determining module 54 and the second sending module 34, and is configured to determine the AP according to the determined number of subcarriers, Δf, and the number of transmitted symbols corresponding to the channel sounding signal. The subcarrier index position configured on each antenna.

The above Δf can be obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated to each antenna of the AP; the subcarrier index position can be obtained by the following formula: ki = mod (k - ti + Δf, Ka) or ki = mod (k + ti + Δf, Ka), where Ka is the number of AP antennas, ti is the number of transmitted symbols and ti = 0, 1, 2 ..., k is the subcarrier index position and k has a value range of [0, SC _BW -1], ki is the corresponding assigned ith antenna and ki = i.

In an optional embodiment, the foregoing third determining module 52 includes: determining the number of subcarriers configured on each antenna by using the following formula:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

FIG. 6 is a structural block diagram of a second apparatus for determining channel information according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes a first receiving module 62, a second receiving module 64, a sixth determining module 66, and a seventh. The module 68 is determined and the device will be described below.

The first receiving module 62 is configured to receive a channel sounding request frame sent by the access point AP, where the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries the system frame number SFN; The second receiving module 64 is connected to the first receiving module 62, and is configured to receive a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries a channel sounding signal; and the sixth determining module 66 is connected to the foregoing The second receiving module 64 is configured to determine an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the AP according to the SFN; the seventh determining module 68 is connected to the sixth determining module 66, and is configured to be The codeword index value and/or the subcarrier index position, and the channel sounding signal determine channel information between the station STA and the AP.

In an optional embodiment, the foregoing second receiving module 64 includes: after receiving a predetermined time interval after the channel probe request frame is sent, the channel detection is performed according to orthogonal codewords configured on each antenna of the AP. The signal frame, the predetermined time interval may be a short inter-frame spacing interval.

FIG. 7 is a structural block diagram 1 of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention. As shown in FIG. 7, the sixth determining module 66 includes a first determining unit 72 and a second determining. Unit 74, the sixth determination module 66 is described below.

The first determining unit 72 is configured to: when determining an orthogonal codeword index value configured on each antenna port of the AP according to the SFN, determining an index value of the orthogonal codeword group corresponding to each antenna according to the SFN; the second determining unit 74, The first determining unit 72 is connected to the first determining unit 72, and is configured to determine an orthogonal codeword index value according to an index value in the orthogonal codeword group and a pre-received orthogonal codeword packet index value of the channel sounding of the AP transmitted by the AP.

The foregoing first determining unit 72 may include: determining an index value Ci:Ci=mod(nka+SFN, Ka) in the orthogonal codeword group by using the following formula, where nka is each antenna index value of the AP, and Ka is an AP. The number of antennas.

The foregoing second receiving module 64 may further include: receiving, by the AP, channel probes that are sent according to an index position of a subcarrier for transmitting a channel sounding signal configured on each antenna of the AP after a predetermined time interval after the channel probe request frame is transmitted. The signal frame, the predetermined time interval may be a short inter-frame spacing interval.

FIG. 8 is a second structural block diagram of a sixth determining module 66 in a second channel information determining apparatus according to an embodiment of the present invention. As shown in FIG. 8, the sixth determining module 66 includes a third determining unit 82 and a fourth determining. The unit 84 and the fifth determining unit 86 are described below. The sixth determining module 66 is described below. The number of subcarriers configured on each antenna may be determined first, and the subcarrier index position may be determined, or the subcarrier index position may be determined first. Then, the number of subcarriers configured on each antenna is determined. The first case is taken as an example for description.

The third determining unit 82 is configured to determine the number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP, and the fourth determining unit 84 is connected to the third determining unit 82, and is configured to When the SFN determines the subcarrier index position configured on each antenna of the AP, the index offset Δf is determined according to the SFN; the fifth determining unit 86 is connected to the fourth determining unit 84, and is set according to the determined number of subcarriers, Δ. The index of the number of transmitted symbols corresponding to the channel sounding signal sent by the AP determines the subcarrier index position configured on each antenna of the AP.

The above Δf can be obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated to each antenna of the AP; the subcarrier index position can be obtained by the following formula: ki = mod (k - ti + Δf, Ka) or ki = mod (k + ti + Δf, Ka), where ti is the number of transmitted symbols and ti = 0, 1, 2, ..., k is a subcarrier The index position and k have a value range of [0, SC _BW -1], ki is the corresponding assigned ith antenna and ki=i.

The third determining unit 82 includes: determining the number of subcarriers configured on each antenna by using the following formula:

Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.

FIG. 9 is a structural block diagram of a seventh determining module 68 in the second channel information determining apparatus according to an embodiment of the present invention. As shown in FIG. 9, the seventh determining module 68 includes an estimating unit 92 and a sixth determining unit 94. The seventh determination module 68 will be described below.

The estimating unit 92 is configured to estimate channel information between the STA and the AP according to the channel sounding signals of the respective antennas of the APs received at the subcarrier index position; the sixth determining unit 94 is connected to the estimating unit 92, and is configured to The channel information between the STA and the AP is determined by performing interpolation processing on the estimated result.

The following describes the channel sounding process, the broadcast information configuration process, and the specific channel information determination process.

Channel detection process:

FIG. 10 is a schematic diagram of a downlink channel sounding process according to an embodiment of the present invention. The channel sounding process will be described below with reference to FIG.

The AP sends a channel sounding request frame to the STA, where the channel sounding request frame includes a sounding sequence index value;

After the channel probe request frame is sent, the AP sends a channel sounding frame immediately after the short Interframe Spacing (SIFS) interval;

After receiving the channel sounding request frame, the STA acquires the sounding sequence index value carried by the channel sounding request frame;

After receiving the channel sounding request frame, the STA continues to receive the channel sounding frame after the subsequent SIFS interval;

After receiving the channel sounding frame, the STA combines the sounding sequence index value carried by the channel sounding request frame, calculates a channel sounding sequence corresponding to the transmitting end, and estimates channel information corresponding to the air interface between the AP transmitting end and the STA receiving end according to the sounding sequence;

Broadcast information configuration process:

The high layer signaling notifies the channel sounding orthogonal codeword packet index value configured by the current AP; wherein the orthogonal codewords are grouped according to four orthogonal sequences, each packet corresponding to a different AP, and each group of intra-group codewords respectively Can be configured to different antennas of the AP;

The AP carries the channel sounding orthogonal codeword packet index value configured by the AP and the maximum transmit spatial stream number/antenna port number of the AP in the beacon frame of the AP;

After obtaining the Beacon frame of the AP, the STA obtains the channel sounding orthogonal codeword packet index value configured by the AP and the maximum transmit spatial stream/antenna port number of the AP;

Specific implementation 1:

The AP broadcasts the orthogonal codeword packet index value of the channel sounding of the AP through the Beacon frame;

After receiving the Beacon frame, the STA may acquire an orthogonal codeword sequence group of the AP channel detection;

The AP sends a channel sounding request frame and carries the probe sequence index value SFN.

Different orthogonal transmit code antennas are allocated to different transmit antennas at the AP end;

The antenna port and the codeword index can be fixedly mapped, as shown in Table 1;

Table 1

Antenna index	Antenna port 0	Antenna port 1	...	Antenna port N
Codeword index	Orthogonal codeword 0	Orthogonal codeword 1	...	Orthogonal codeword N

The antenna port and the codeword index may be determined according to the detection index value SFN, as shown in the following table;

Ci=mod(nka+SFN, Ka)

Where Ka is the number of antennas, Ci is the corresponding codeword index value, and nka is the antenna port index value;

The STA receives the channel sounding request frame, acquires the sounding sequence index value SFN information, calculates an index value of the orthogonal codeword group corresponding to each antenna port according to the SFN information, and performs orthogonal codeword grouping according to the Beacon frame. By indexing and combining the index values in the orthogonal code block, the true orthogonal codeword index value of each antenna port configuration can be calculated;

In the transmission slot of the channel sounding frame, each antenna of the AP performs channel sounding frame signal transmission according to the allocated orthogonal codeword;

The STA receives the channel sounding frame signal acquired in the receiving time slot of the sounding frame signal, and performs channel estimation according to the orthogonal codeword corresponding to the antenna, and acquires channel information of the full bandwidth of the multiple antennas between the AP and the STA;

Specific implementation 2:

The AP sends a channel sounding request frame and carries the probe sequence index value SFN.

The AP calculates the frequency domain resources allocated by different transmit antennas;

Calculating the number of subcarriers allocated by each antenna;

Ka is the number of antennas, and the number of SC _BW bandwidth subcarriers;

Calculating a subcarrier index value corresponding to each antenna, and the frequency domain resource allocation of the antenna is related to the channel sounding sequence index value, the number of transmitting antennas, and the index value of the transmitted symbol number;

Resource interval allocation

Ki=mod(k-ti+△f, Ka) or ki=mod(k+ti+△f, Ka)

Δf=mod(SFN, SC _BW ), Δf is an index offset, and SFN is a sequence index value of a channel sounding frame;

Ti=0,1,2... is the index of the number of transmitted symbols, and the value range of k is [0, SC _BW -1];

Ki=i, corresponding to the assigned ith antenna;

The STA receives the channel sounding request frame, and acquires the sounding sequence index value SFN information;

In the transmission time slot of the channel sounding frame, each antenna transmits the sounding signal according to the allocated subcarrier position;

The STA obtains the channel offset of each antenna according to the obtained index offset Δf value and the corresponding transmission symbol index value (the transmission symbol index value refers to the index value of the number of OFDM symbols transmitted by the transmitting end). The subcarrier index position corresponding to the signal is obtained, and the channel sounding signal corresponding to each antenna is obtained, and the channel estimation is performed according to the received channel sounding signal, and interpolation is performed between the frequency points to obtain a channel with full bandwidth of multiple antennas between the AP and the STA. information.

The technical solution of the present invention will be described in more detail below with reference to specific embodiments.

Example 1:

The following is a 20M bandwidth, the AP is configured with 4 antennas and the 802.11n standard, and different orthogonal codeword configurations are adopted between the antennas. The detection sequence index value SFN is 1, and the orthogonal codeword packet index value of the AP configuration is 1, indicating that the present invention has many The way the antenna channel is detected.

The AP broadcasts the orthogonal codeword packet index value 1 of the channel sounding of the AP through the Beacon frame;

After receiving the Beacon frame, the STA may acquire an orthogonal codeword sequence group of the AP channel detection;

The AP sends a channel sounding request frame and carries the probe sequence index value SFN.

Different orthogonal transmit code antennas are allocated to different transmit antennas at the AP end;

Ci=mod(nka+SFN, Ka)=mod(nka+1,4);

Where Ka is the number of antennas, Ci is the index value in the corresponding codeword group, and nka is the antenna port index value;

The obtained antenna port and the index value in the orthogonal code block are as shown in Table 2:

Table 2

Antenna index	Antenna port 0	Antenna port 1	Antenna port 2	Antenna port 3
Codeword index	Orthogonal codeword 1	Orthogonal codeword 2	Orthogonal codeword 3	Orthogonal codeword 0

The STA receives the channel sounding request frame, obtains the sounding sequence index value SFN information, calculates an index value of the orthogonal codeword group corresponding to each antenna port according to the SFN information, and uses the orthogonal codeword grouping index value obtained according to the Beacon frame and combines the orthogonality. The index value in the codeword group can be used to calculate the true orthogonal codeword index value of each antenna port configuration, as shown in Figure 3.

table 3

Antenna index	Antenna port 0	Antenna port 1	Antenna port 2	Antenna port 3
Codeword index	Orthogonal codeword 5	Orthogonal codeword 6	Orthogonal codeword 7	Orthogonal codeword 4

In the transmission slot of the channel sounding frame, each antenna of the AP performs detection signal transmission according to the assigned orthogonal codeword. give away;

The STA receives the channel sounding signal acquired in the receiving time slot of the sounding signal, and performs channel estimation on the received channel sounding signal according to the orthogonal codeword corresponding to the antenna, and acquires channel information of the full bandwidth of the multiple antennas between the AP and the STA;

Example 2:

The following is a 20M bandwidth, AP configuration 4 antenna, 802.11n standard, inter-antenna frequency domain resource spacing allocation as an example, and the detection sequence index value SFN is 1, indicating the multi-antenna channel detection mode of the present invention. 11 is a schematic diagram of frequency domain resource spacing allocation according to an embodiment of the present invention, where pi identifies an antenna index. The present embodiment will be described below with reference to FIG.

The AP sends a channel sounding request frame and carries the probe sequence index value SFN.

The AP calculates the frequency domain resources of different transmit antennas.

Calculating the number of subcarriers allocated by each antenna;

Calculating a subcarrier index value corresponding to each antenna;

Ki=mod(k-ti+Δf, Ka), ti=0, 1, 2... is the index of the transmitted symbols;

Δf=mod(SFN, SC _BW )=mod(1,52)=1;

Ki=mod(k-ti+Δf, Ka)=mod(k-ti+1,4), k=0:51, k is a subcarrier index value;

Ki=0, assign antenna 0;

Ki=1, allocate antenna 1;

Ki=2, allocating antenna 2;

Ki=3, allocating antenna 3;

The STA receives the channel sounding request frame, obtains the sounding sequence index value SFN information, and calculates an index offset Δf value;

In the transmission time slot of the sounding frame, each antenna performs channel sounding signal transmission according to the allocated subcarrier position;

The STA obtains the subcarrier index position corresponding to the channel sounding signal of each antenna according to the obtained index offset Δf value and the corresponding received symbol number in the receiving time slot of the received sounding signal, and acquires the channel sounding signal corresponding to each antenna. Channel estimation is performed according to the received channel sounding signal, and interpolation is performed between the frequency points to obtain channel information of the full bandwidth of multiple antennas between the AP and the STA.

By adopting the downlink channel detection method proposed in the embodiment of the present invention, the multi-antenna channel detection is simultaneously performed by using the code division or the frequency division between the detection antennas, and the channel information of the full-bandwidth full antenna can be obtained by the single training symbol at the fastest time, and the channel information is improved. The efficiency of channel sounding; at the same time, the frequency domain resource allocation between the antennas or the codeword resource allocation is associated with the channel sounding sequence index value, which can not only improve the diversity gain in the frequency domain and the time domain, but also reduce the influence of the same frequency interference.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, the method and apparatus for determining channel information provided by the embodiments of the present invention have the following beneficial effects: the problem of low channel detection efficiency in the related art is solved, and the effect of improving channel detection efficiency is achieved.

Claims (34)

1. A method for determining channel information, comprising:

   Sending a channel sounding request frame to the station STA, where the channel sounding request frame is used to request to send a channel sounding signal to the STA, where the channel sounding request frame carries a configuration on each antenna for determining the access point AP. System frame number SFN of orthogonal codeword index value and/or subcarrier index position;

   Transmitting, by the STA, the channel sounding signal frame, where the channel sounding signal frame carries the channel sounding signal;

   The orthogonal codeword index value and/or the subcarrier index location, and the channel sounding signal are used to determine channel information between the station STA and the AP.
2. The method of claim 1, wherein transmitting the channel sounding signal frame to the STA comprises:

   After the predetermined time interval after the channel probe request frame is sent, the channel sounding signal frame is sent to the STA according to an orthogonal codeword configured on each antenna of the AP.
3. The method of claim 2, further comprising:

   Determining, according to the SFN, an index value in an orthogonal code block corresponding to each antenna;

   And determining an orthogonal codeword index value corresponding to the orthogonal codeword according to the index value in the orthogonal code block and the predetermined orthogonal codeword packet index value.
4. The method according to claim 3, wherein determining an index value of the orthogonal code block within the respective antennas according to the SFN comprises:

   The index value Ci in the orthogonal code block is determined by the following formula:

   Ci=mod(nka+SFN, Ka), where nka is the respective antenna index value of the AP, and Ka is the number of antennas of the AP.
5. The method of claim 1, wherein transmitting the channel sounding signal frame to the STA comprises:

   After the predetermined time interval after the channel sounding request frame is sent, the channel sounding signal frame is transmitted according to an index position of a subcarrier configured to transmit the channel sounding signal configured on each antenna of the AP.
6. The method of claim 5, further comprising:

   Determining a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP;

   Determining an index offset Δf according to the SFN;

   And determining, according to the determined number of the subcarriers, the Δf, and the number of transmitted symbols corresponding to the channel sounding index, the subcarrier index position configured on each antenna of the AP.
7. The method of claim 6 wherein

   The Δf is obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated to each antenna of the AP;

   The subcarrier index position is obtained by the following formula:

   Ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where Ka is the number of antennas of the AP, ti is the index of the transmitted symbols and ti= 0,1,2...,k is the subcarrier index position and the value range of k is [0, SC _BW -1], ki is the corresponding allocated ith antenna and ki=i.
8. The method of claim 6, wherein determining the number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP comprises:

   The number of the subcarriers configured on the respective antennas is determined by using the following formula:

   

   Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.
9. A method for determining channel information, comprising:

   Receiving a channel sounding request frame sent by the access point AP, wherein the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries a system frame number SFN;

   Receiving a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries the channel sounding signal;

   Determining orthogonal codeword index values and/or subcarrier index locations configured on respective antennas of the AP according to the SFN;

   Channel information between the station STA and the AP is determined according to the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal.
10. The method of claim 9, wherein receiving the channel sounding signal frame sent by the AP comprises:

    And receiving, according to a predetermined time interval after the AP sends the channel sounding request frame, the channel sounding signal frame sent according to an orthogonal codeword configured on each antenna of the AP.
11. The method according to claim 9, wherein determining the orthogonal codeword index value configured on each antenna port of the AP according to the SFN comprises:

    Determining, according to the SFN, an index value in an orthogonal code block corresponding to each antenna;

    And determining the orthogonal codeword index value according to the index value in the orthogonal code block and the pre-received orthogonal codeword packet index value of the channel sounding of the AP sent by the AP.
12. The method according to claim 11, wherein determining the index value in the orthogonal code block corresponding to each antenna according to the SFN comprises:

    The index value Ci in the orthogonal code block is determined by the following formula:

    Ci=mod(nka+SFN, Ka), where nka is the respective antenna index value of the AP, and Ka is the number of antennas of the AP.
13. The method of claim 9, wherein receiving the channel sounding signal frame sent by the AP comprises:

    Receiving, after the predetermined time interval after the AP sends the channel sounding request frame, the channel sounding according to an index position of a subcarrier configured to send the channel sounding signal configured on each antenna of the AP Signal frame.
14. The method according to claim 13, wherein determining the subcarrier index position configured on each antenna of the AP according to the SFN comprises:

    Determining a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP;

    Determining an index offset Δf according to the SFN;

    Determining, according to the determined number of the subcarriers, the Δf, and the number of transmitted symbols corresponding to the channel sounding signal sent by the AP, the subcarrier index position configured on each antenna of the AP.
15. The method of claim 14 wherein

    The Δf is obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated to each antenna of the AP;

    The subcarrier index position is obtained by the following formula:

    Ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where ti is the index of the transmitted symbols and ti=0, 1, 2..., k The position is indexed for the subcarrier and the range of k is [0, SC _BW -1], ki is the corresponding allocated ith antenna and ki=i.
16. The method of claim 14, wherein determining the number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP comprises:

    The number of the subcarriers configured on the respective antennas is determined by using the following formula:

    

    Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.
17. The method according to claim 9, wherein determining channel information between the station STA and the AP according to the subcarrier index position and the channel sounding signal comprises:

    Estimating channel information between the STA and the AP according to channel sounding signals of respective antennas of the AP received at the subcarrier index position;

    Channel information between the STA and the AP is determined by performing interpolation processing on the result of the estimation.
18. A device for determining channel information, comprising:

    a first sending module, configured to send a channel sounding request frame to the station STA, where the channel sounding request frame is configured to send a channel sounding signal to the STA, where the channel sounding request frame carries an identifier for determining an access point Orthogonal codeword index value and/or system frame number SFN of the subcarrier index position configured on each antenna of the AP;

    a second sending module, configured to send the channel sounding signal frame to the STA, where the channel sounding signal frame carries the channel sounding signal;

    The orthogonal codeword index value and/or the subcarrier index location, and the channel sounding signal are used to determine channel information between the station STA and the AP.
19. The apparatus of claim 18, wherein the second transmitting module comprises:

    After the predetermined time interval after the channel probe request frame is sent, the channel sounding signal frame is sent to the STA according to an orthogonal codeword configured on each antenna of the AP.
20. The apparatus of claim 19, further comprising:

    a first determining module, configured to determine, according to the SFN, an index value in an orthogonal code block corresponding to each antenna;

    The second determining module is configured to determine an orthogonal codeword index value corresponding to the orthogonal codeword according to the orthogonal codeword group index value and the predetermined orthogonal codeword packet index value.
21. The apparatus of claim 20, wherein the first determining module comprises:

    The index value Ci in the orthogonal code block is determined by the following formula:

    Ci=mod(nka+SFN, Ka), where nka is the respective antenna index value of the AP, and Ka is the number of antennas of the AP.
22. The apparatus of claim 18, wherein the second transmitting module comprises:

    The channel sounding signal frame transmitted according to an index position of a subcarrier for transmitting the channel sounding signal configured on each antenna of the AP after a predetermined time interval after the channel sounding request frame is transmitted.
23. The apparatus of claim 22, further comprising:

    a third determining module, configured to determine a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP;

    a fourth determining module, configured to determine an index offset Δf according to the SFN;

    The fifth determining module is configured to determine the subcarrier index position configured on each antenna of the AP according to the determined number of the subcarriers, the Δf, and the number of transmitted symbols corresponding to the channel sounding signal.
24. The device according to claim 23, wherein

    The Δf is obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated to each antenna of the AP;

    The subcarrier index position is obtained by the following formula:

    Ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where Ka is the number of antennas of the AP, ti is the index of the transmitted symbols and ti= 0,1,2...,k is the subcarrier index position and the value range of k is [0, SC _BW -1], ki is the corresponding allocated ith antenna and ki=i.
25. The apparatus of claim 23, wherein the third determining module comprises:

    The number of the subcarriers configured on the respective antennas is determined by using the following formula:

    

    Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.
26. A device for determining channel information, comprising:

    The first receiving module is configured to receive a channel sounding request frame sent by the access point AP, where the channel sounding request frame is used to request that the channel sounding signal is sent by the AP, where the channel sounding request frame carries a system frame No. SFN;

    a second receiving module, configured to receive a channel sounding signal frame sent by the AP, where the channel sounding signal frame carries the channel sounding signal;

    a sixth determining module, configured to determine, according to the SFN, an orthogonal codeword index value and/or a subcarrier index position configured on each antenna of the AP;

    And a seventh determining module, configured to determine channel information between the station STA and the AP according to the orthogonal codeword index value and/or the subcarrier index position, and the channel sounding signal.
27. The apparatus of claim 26, wherein the second receiving module comprises:

    Receiving, after a predetermined time interval after the AP transmits the channel sounding request frame, the channel sounding signal frame sent according to an orthogonal codeword configured on each antenna of the AP.
28. The apparatus according to claim 27, wherein when determining the orthogonal codeword index value configured on each antenna port of the AP according to the SFN, the sixth determining module comprises:

    a first determining unit, configured to determine, according to the SFN, an index value in an orthogonal code block corresponding to each antenna;

    a second determining unit, configured to determine, according to the index value in the orthogonal code block and the pre-received orthogonal codeword packet index value of the channel sounding of the AP sent by the AP, the orthogonal codeword index value.
29. The apparatus of claim 28, wherein the first determining unit comprises:

    The index value Ci in the orthogonal code block is determined by the following formula:

    Ci=mod(nka+SFN, Ka), where nka is the respective antenna index value of the AP, and Ka is the number of antennas of the AP.
30. The apparatus of claim 26, wherein the second receiving module comprises:

    Receiving, after the predetermined time interval after the AP sends the channel sounding request frame, the channel sounding according to an index position of a subcarrier configured to send the channel sounding signal configured on each antenna of the AP Signal frame.
31. The apparatus according to claim 30, wherein when determining a subcarrier index position configured on each antenna of the AP according to the SFN, the sixth determining module comprises:

    a third determining unit, configured to determine a number of subcarriers configured to transmit the channel sounding signal frame configured on each antenna of the AP;

    a fourth determining unit, configured to determine an index offset Δf according to the SFN;

    a fifth determining unit, configured to determine, according to the determined number of the subcarriers, the Δf, and the number of transmitted symbols corresponding to the channel sounding signal sent by the AP, to determine the configuration on each antenna of the AP Subcarrier index position.
32. The device according to claim 31, wherein

    The Δf is obtained by the following formula: Δf=mod(SFN, SC _BW ), where SC _BW is the total number of subcarriers allocated to each antenna of the AP;

    The subcarrier index position is obtained by the following formula:

    Ki=mod(k-ti+Δf, Ka) or ki=mod(k+ti+Δf, Ka), where ti is the index of the transmitted symbols and ti=0, 1, 2..., k The position is indexed for the subcarrier and the range of k is [0, SC _BW -1], ki is the corresponding allocated ith antenna and ki=i.
33. The apparatus according to claim 31, wherein said third determining unit comprises:

    The number of the subcarriers configured on the respective antennas is determined by using the following formula:

    

    Where Ka is the number of antennas of the AP, and SC _BW is the total number of subcarriers allocated to each antenna of the AP.
34. The apparatus according to claim 26, wherein, when determining channel information between the station STA and the AP according to the subcarrier index position and the channel sounding signal, the seventh determining module comprises:

    An estimating unit, configured to estimate channel information between the STA and the AP according to a channel sounding signal of each antenna of the AP received at the subcarrier index position;

    The sixth determining unit is configured to determine channel information between the STA and the AP by performing interpolation processing on the result of the estimation.

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