Method for requesting for using midamble in data transmission and site

A request-to-send, data technology, applied in the direction of the device dedicated to the receiver, adjustment of the transmission mode, digital transmission system, etc., can solve the problem of not being well solved and so on

Inactive Publication Date: 2013-07-17
HUAWEI TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

The introduction of Doppler/Midamble (midamble) is essentially to insert two LTFs and one STF in the subsequent data part. However, in the prior

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  • Method for requesting for using midamble in data transmission and site
  • Method for requesting for using midamble in data transmission and site
  • Method for requesting for using midamble in data transmission and site

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[0062]

[0063] Further, a new embodiment is given. In the actual wireless local area network protocol, the data field is composed of a service field, data bits, tail bits and padding bits, wherein the padding bits are selected and added as required. The first sixteen bits of the data field are the service fields. The first seven bits of the service field are the initialization bits of the scrambler, which are used to synchronize with the descrambler. These bits are set to 0 in order to estimate the initial state of the scrambler in the receiver. In addition, the first seven bits of the pseudo-random integer, in the embodiment of the present invention, select any two bits in the seven bits representing the pseudo-random integer to indicate the request for high Doppler frame format and feedback Doppler / Midamble, using this scheme In essence, it will not affect the generation of pseudo-random sequences. In the present embodiment, the method for requesting Doppler / Midamble f...

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Abstract

The invention discloses a method for transmitting data in a wireless local area network. The method includes that a receiving end generates a VHT control frame. One bit for indicating frame format types in the VHT control frame and one bit for indicating hollow space-time flow numbers in a field form a binary information bit group. The VHT control frame is sent to a transmitting end. A binary information bit group in the VHT control frame is used for requesting the transmitting end to use a midamble in data transmission to enable the transmitting end to insert long training fields into data transmitted by the receiving end.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for requesting midamble (Doppler / Midamble) feedback in a wireless local area network. Background technique [0002] In order to extend the WLAN technology to a wider application scenario, for example, the coverage range is extended from 100m to 1Km, it is necessary to re-examine and revise the existing WLAN technology. Correspondingly, its application scenarios are no longer limited to indoors, but can be applied to outdoor environments. Compared with the indoor environment, the outdoor environment is more complicated. One of the important factors is that there are a large number of moving objects in the outdoor environment, and the mobility of the objects will cause instability and rapid fading of the wireless channel. Fast fading will greatly shorten the time that the channel is considered static or unchanged. The simplest way to deal with this effect is to limit the time le...

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Application Information

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IPC IPC(8): H04L1/00H04W84/12
CPCH04L1/0036H04L27/2613H04L1/0007H04W84/12
Inventor 黄永明李世党杨讯
Owner HUAWEI TECH CO LTD
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