CN-113824480-B - Access point supporting wireless communication and method of operating the same

Abstract

A wireless communication employing Channel State Information (CSI) feedback is disclosed. A method of operation of a transmitting apparatus, such as an access point, providing wireless communication includes receiving feedback of channel response information from an external communication apparatus, generating a beam steering matrix based on the channel response information, generating a power allocation matrix based on an average SNR of each of a plurality of streams included in the channel response information, and performing beam forming on the external communication apparatus based on the generated power allocation matrix and the generated beam steering matrix. The channel response information is a compressed beamforming feedback for multiple-input multiple-output single-user beamforming. A first power allocated to a first stream having an average SNR of a first value among the plurality of streams is greater than a second power allocated to a second stream having an average SNR of a second value, the second value being greater than the first value.

Inventors

• AN MINJI
• LI XUFENG
• JIN CHENGZHU
• JIN ZHUNSHI
• Quan Encheng

Assignees

• 三星电子株式会社

Dates

Publication Date

20260505

Application Date

20210618

Priority Date

20200723

Claims (20)

1. 1. A method of operation of an access point configured to provide wireless communication, the method comprising: receiving feedback of channel response information from an external communication device; generating a beam steering matrix based on the channel response information; generating a power allocation matrix based on information of an average signal-to-noise ratio for each of a plurality of streams included in the channel response information, and Performing beamforming on the external communication device based on the generated power allocation matrix and the generated beam steering matrix, Wherein the channel response information includes compressed beamforming feedback information for communications based on multiple-input multiple-output single-user beamforming, and Wherein a first power allocated to a first stream of the plurality of streams having an average signal-to-noise ratio of a first value is higher than a second power allocated to a second stream of the plurality of streams having an average signal-to-noise ratio of a second value, the second value being greater than the first value.
2. 2. The method of claim 1, wherein the power allocation matrix is applied identically to each of a plurality of subcarriers.
3. 3. The method of claim 1, wherein the power allocation matrix is generated based on a constant value and a ratio of average signal-to-noise ratios of two of the plurality of streams.
4. 4. The method of claim 1, wherein the power distribution matrix is a first power distribution matrix having a structure of a diagonal matrix or a second power distribution matrix having a structure of a rotation matrix.
5. 5. The method of claim 4, further comprising: a level of a modulation coding scheme used in wireless communication with the external communication device is determined.
6. 6. The method of claim 5, wherein one of the first power allocation matrix and the second power allocation matrix is selected as the power allocation matrix based on the determined level of modulation coding scheme.
7. 7. The method of claim 6, wherein the first power allocation matrix is selected as the power allocation matrix when a coding rate corresponding to the determined level of modulation coding scheme is greater than a reference value, and wherein the second power allocation matrix is selected as the power allocation matrix when a coding rate corresponding to the determined level of modulation coding scheme is not greater than the reference value.
8. 8. The method of claim 4, wherein when the number of the plurality of streams is Nss, where Nss is a positive integer, the power allocation matrix is a diagonal matrix of Nss x Nss size and is defined based on the following equation: Where DP is the power allocation matrix, p 1 to p Nss represent diagonal elements of the diagonal matrix, SNR 1 to SNR Nss are the average signal-to-noise ratios of the multiple streams, respectively, and τ and α are constants.
9. 9. The method of claim 8, wherein a is a value between 0 and 1, and Where τ is defined to satisfy the following equation:
10. 10. The method of claim 8, wherein the power allocation matrix is a block rotation matrix of Nss x Nss size and is defined as: Where p i is the ith column vector of the NSS×NSS identity matrix For ns s to be an odd number, For ns s to be an even number, Where RP is the power allocation matrix, PM is a permutation matrix of size N SS ×N SS , and RM is a rotation matrix comprising R 1 to R Nss/2 .
11. 11. The method of claim 10, wherein R 1 to R Nss/2 are defined based on the formula: Where Rx represents each of R 1 to R Nss/2 , α is a constant value equal to or greater than 0 and equal to or less than 1, and SNR a and SNR b are signal-to-noise ratios of a pair of the plurality of streams corresponding to each of R 1 to R Nss/2 .
12. 12. The method of claim 1, wherein the wireless communication is an IEEE 802.11 based wireless local area network communication.
13. 13. The method of claim 1, wherein the beam steering matrix is generated based on singular value decomposition.
14. 14. A method of operation of an access point configured to provide wireless communication, the method comprising: receiving feedback of channel response information from an external communication device; generating a beam steering matrix based on the channel response information; Selecting a level of a modulation coding scheme; Selecting one of the first power allocation matrix and the second power allocation matrix based on the selected level of modulation coding scheme, and Performing beamforming on the external communication device based on the selected one of the first and second power allocation matrices and the beam steering matrix, Wherein each of the first power allocation matrix and the second power allocation matrix is generated based on information of average signal-to-noise ratios of the respective plurality of streams, the information being included in the channel response information, Wherein the first power distribution matrix has a structure of a diagonal matrix and the second power distribution matrix has a structure of a block rotation matrix, Wherein the channel response information is a compressed beamforming feedback for mimo single user beamforming, and Wherein a first power allocated to a first stream of the plurality of streams having an average signal-to-noise ratio of a first value is higher than a second power allocated to a second stream of the plurality of streams having an average signal-to-noise ratio of a second value, the second value being greater than the first value.
15. 15. The method of claim 14, wherein the first power allocation matrix is selected when a coding rate corresponding to the selected level of modulation coding scheme is greater than a reference value, and wherein the second power allocation matrix is selected otherwise.
16. 16. The method of claim 14, wherein the levels of the modulation coding scheme include 0 th to seventh levels defined by an IEEE 802.11 standard, Wherein when the level of the modulation and coding scheme of the selected level is the second level, the fourth level, the fifth level, the sixth level or the seventh level, the first power allocation matrix is selected, and Wherein the second power allocation matrix is selected when the level of the modulation coding scheme of the selected level is the 0 th level, the first level, or the third level.
17. 17. The method of claim 16, wherein the second power allocation matrix is selected instead of the first power allocation matrix when the level of the modulation coding scheme of the selected level is a second level, the number of transmit antennas included in the access point is 2, and the number of receive antennas included in the external communication device is 2.
18. 18. An access point configured to provide wireless communication, comprising: A controller configured to receive feedback including channel state information of information on an average signal-to-noise ratio of each of a plurality of streams and information on a beam steering matrix from an external communication device, and output a power allocation matrix and the beam steering matrix based on the channel state information; a signal processor configured to process data to be transmitted to the external communication device; a power distribution engine configured to perform power distribution on signals processed by the signal processor based on the power distribution matrix from the controller; a beamforming engine configured to perform beamforming based on an output of the power distribution engine and the beam steering matrix, and A plurality of antennas configured to transmit an output of the beamforming engine to the external communication device, Wherein the power allocation engine applies the power allocation matrix equally to each of a plurality of subcarriers to perform the power allocation, and Wherein the transmitting device performs the wireless communication with the external communication device using multiple-input multiple-output based beamforming.
19. 19. The access point of claim 18, wherein the transmitting means is an access point and the power allocation matrix comprises a first power allocation matrix having a structure of a diagonal matrix or a second power allocation matrix having a structure of a rotated matrix.
20. 20. The access point of claim 19, wherein the controller comprises: a modulation and coding scheme determiner configured to determine a level of a modulation and coding scheme to be used in the wireless communication, and A power allocation matrix generator configured to generate one of the first power allocation matrix and the second power allocation matrix as the power allocation matrix based on the level of the modulation coding scheme determined by the modulation coding scheme determiner.

Description

Access point supporting wireless communication and method of operating the same Cross Reference to Related Applications The present application claims priority from U.S. patent provisional application No.63/040,644, filed on 18 th month 2020, and from korean patent application No. 10-2020-0091971, filed on 23 th 7 th 2020, filed on korean intellectual property office, the disclosures of which are incorporated herein by reference in their entireties. Technical Field The present disclosure relates generally to wireless communications, and more particularly, to an access point supporting wireless communications and a method of operating the same. Background Wireless communication provides data communication between various devices via wireless channels. Improvements are continually sought to support higher data transfer rates to meet the demands for increased wireless data traffic. A common scheme for increasing data transfer rates is known as Multiple Input Multiple Output (MIMO), which uses multiple transmit antennas at a transmitting device (e.g., an access point in a WLAN system) and multiple receive antennas at a receiving device (e.g., a wireless terminal, user Equipment (UE), etc.). Beamforming techniques for directing an antenna beam formed by a transmitting antenna to a particular receiving device are being used to improve the efficiency of wireless communications. In order to improve communication quality, a receiving apparatus may measure a condition of a wireless channel, referred to as "Channel State Information (CSI)", and feed back the CSI to a transmitting apparatus. The transmitting device may then use the feedback information to make beamforming adjustments using a technique called precoding, which may reduce data errors due to multipath fading, etc. Disclosure of Invention Embodiments of the inventive concept provide wireless communication with improved reliability and performance. According to an exemplary embodiment, a method of operation of an access point configured to provide wireless communication includes receiving feedback of channel response information from an external communication device, generating a beam steering matrix based on the channel response information, generating a power allocation matrix based on an average signal-to-noise ratio (SNR) corresponding to each of a plurality of streams included in the channel response information, and performing beam forming on the external communication device based on the generated power allocation matrix and the generated beam steering matrix. The channel response information is compressed beamforming feedback information based on a communication of multiple-input multiple-output single-user beamforming (MIMO SUBF). The first power allocated to a first stream having a first value of average SNR among the plurality of streams is higher than the second power allocated to a second stream having a second value of average SNR among the plurality of streams, the second value being greater than the first value. According to an exemplary embodiment, a method of operation of an access point configured to provide wireless communication includes receiving feedback of channel response information from an external communication device, generating a beam steering matrix based on the channel response information, selecting a level of a modulation coding scheme, selecting one of a first power allocation matrix and a second power allocation matrix based on the modulation coding scheme of the selected level, and performing beam forming on the external communication device based on the selected one of the first and second power allocation matrices and the beam steering matrix. Each of the first and second power allocation matrices is generated based on information of an average signal-to-noise ratio (SNR) of each of the plurality of streams, wherein the information is included in the channel response information. The first power distribution matrix has a structure of a diagonal matrix and the second power distribution matrix has a structure of a block rotation matrix. The channel response information is compressed beamforming feedback for multiple-input multiple-output single-user beamforming (MIMO SUBF). The first power allocated to a first stream having a first value of average SNR among the plurality of streams is higher than the second power allocated to a second stream having a second value of average SNR among the plurality of streams, the second value being greater than the first value. According to an exemplary embodiment, an access point configured to provide wireless communication includes a controller that receives feedback including channel state information about an average signal-to-noise ratio (SNR) of each of a plurality of streams and information about a beam steering matrix from an external communication device and outputs a power allocation matrix and a beam steering matrix based on the channel state information, a signal processor th