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A distributed csi estimation and dynamic update method in wlan

A dynamically updated and distributed technology, applied in space transmit diversity, diversity/multi-antenna systems, baseband system components, etc., can solve problems such as waste of CSI information transmission time, achieve compressed channel estimation overhead, reduce channel estimation, and improve The effect of system performance

Active Publication Date: 2019-10-18
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In fact, the channel coherence time of stationary users is enough to transmit several data units, while the channel coherence time of moving users is much shorter, and the channel estimation for each packet in the current protocol actually has an overestimation
In addition, the 802.11ac protocol transmits the CSI of all users for each channel estimation, and the AP performs unified planning, but the final multi-user MIMO upper limit is only 4 spatial streams. When the number of users increases, it not only brings huge computing pressure to the AP , causing a lot of waste of CSI information transmission time

Method used

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  • A distributed csi estimation and dynamic update method in wlan
  • A distributed csi estimation and dynamic update method in wlan
  • A distributed csi estimation and dynamic update method in wlan

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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0046] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0047] figure 1 It is a schematic flowchart of an embodiment of a method for estimating and dynamically updating distributed CSI in a WLAN provided by the present invention. As shown in the figure, based on the above purpose, in one aspect of the present invention, a...

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Abstract

The invention discloses a distributed CSI (Channel State Information) estimation and dynamic update method in a WLAN. By dispersing channel estimation to user sides in a competitive manner, the pressure of an AP (Access Point) side on channel planning is reduced; and meanwhile, CSI of each user at the AP side is timed, and the CSI is updated dynamically via a CSI dynamic update algorithm, so the unnecessary channel estimation is reduced; and thus, the channel estimation overhead is compressed on a time domain; the communication efficiency for multi-user MIMO is improved, and the throughput of the WLAN is improved.

Description

technical field [0001] The present invention relates to the channel estimation and update of a wireless local area network distributed access system in the technical field of wireless communication, and in particular to a distributed CSI estimation and dynamic update method in WLAN. Background technique [0002] With the popularization of smart phones, a large number of applications of wearable devices and the rapid development of multimedia services, global mobile data has shown a blowout growth. According to Cisco's forecast report, by 2019, the global wireless data traffic will be ten times the current data volume, reaching 300 billion GB, and the penetration rate of global wireless communication equipment, especially smart mobile terminals, will reach 70%. Massive data services bring not only traffic growth to the traditional wireless network architecture, but also a variety of convenient and fast wireless data access methods is also one of the main problems at present. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04B7/0413H04B7/0417H04B7/0452H04B7/06
Inventor 李兆兴胡智群路兆铭温向明亓航
Owner BEIJING UNIV OF POSTS & TELECOMM
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