Antenna/Beam Selection Training in MIMO Wireless LANs with Different Sounding Frames
First Claim
1. A method for selecting antennas in a multiple-input, multiple-output (MIMO) wireless local area network (WLAN) including a plurality of stations, each station including a set of antennas, said method comprising steps of:
- receiving, via a channel, at a station in the WLAN plural consecutive packets including plural sounding packets, each sounding packet corresponding to a different subset of the set of antennas, and at least one of the plural consecutive packets including (i) a high throughput (HT) control field including a signal to initiate antenna selection and (ii) a number N indicative of a number of sounding packets which follow the at least one packet including the HT control field and which are to be used for antenna selection;
estimating a channel matrix based on a characteristic of the channel as indicated by the received N sounding packets; and
selecting a subset of antennas according to the channel matrix.
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Accused Products
Abstract
A method selects antennas in a multiple-input, multiple-output (MIMO) wireless local area network (WLAN) that includes a plurality of stations, and each station includes a set of antennas. Plural consecutive packets, received at a station, include plural consecutive sounding packets. Each sounding packet corresponds to a different subset of the set of antennas, and at least one of the plural consecutive packets includes a high throughput (HT) control field including a signal to initiate antenna selection and a number N indicative of a number of sounding packets which follow the at least one packet including the HT control field and which are to be used for antenna selection. A channel matrix is estimated based on a characteristic of the channel as indicated by the received N sounding packets, and a subset of antennas is selected according to the channel matrix. Station and computer program product embodiments include similar features.
109 Citations
39 Claims
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1. A method for selecting antennas in a multiple-input, multiple-output (MIMO) wireless local area network (WLAN) including a plurality of stations, each station including a set of antennas, said method comprising steps of:
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receiving, via a channel, at a station in the WLAN plural consecutive packets including plural sounding packets, each sounding packet corresponding to a different subset of the set of antennas, and at least one of the plural consecutive packets including (i) a high throughput (HT) control field including a signal to initiate antenna selection and (ii) a number N indicative of a number of sounding packets which follow the at least one packet including the HT control field and which are to be used for antenna selection; estimating a channel matrix based on a characteristic of the channel as indicated by the received N sounding packets; and selecting a subset of antennas according to the channel matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A station in a multiple-input, multiple-output (MIMO) wireless local area network (WLAN) including a plurality of stations, each station including a set of antennas, said station comprising:
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a receiver configured to receive, via a channel, plural consecutive packets including plural sounding packets, each sounding packet corresponding to a different subset of the set of antennas, and at least one of the plural consecutive packets including (i) a high throughput (HT) control field including a signal to initiate antenna selection and (ii) a number N indicative of a number of sounding packets which follow the at least one packet including the HT control field and which are to be used for antenna selection; an estimating unit configured to estimate a channel matrix based on a characteristic of the channel as indicated by the received N sounding packets; and a selecting unit configured to select a subset of antennas according to the channel matrix. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. An electronic storage medium storing program instructions which, when executed by a processor to select antennas in a multiple-input, multiple-output (MIMO) wireless local area network (WLAN) including a plurality of stations, each station including a set of antennas, results in performance of the steps comprising:
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receiving, via a channel, at a station in the WLAN plural consecutive packets including plural sounding packets, each sounding packet corresponding to a different subset of the set of antennas, and at least one of the plural consecutive packets including (i) a high throughput (HT) control field including a signal to initiate antenna selection and (ii) a number N indicative of a number of sounding packets which follow the at least one packet including the HT control field and which are to be used for antenna selection; estimating a channel matrix based on a characteristic of the channel as indicated by the received N sounding packets; and selecting a subset of antennas according to the channel matrix. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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Specification