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Detection method and detection device for different format frames in wireless local area network

A technology of wireless local area network and detection method, applied in wireless communication, electrical components and other directions, can solve the problems of low signal-to-noise ratio, false detection rate and the bottleneck of receiving sensitivity, and achieve the effect of good sensitivity, high precision and wide application range

Active Publication Date: 2012-09-05
中科威发半导体(苏州)有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

But at a low SNR, the false detection rate of this scheme will become a bottleneck of the receiving sensitivity

Method used

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  • Detection method and detection device for different format frames in wireless local area network
  • Detection method and detection device for different format frames in wireless local area network
  • Detection method and detection device for different format frames in wireless local area network

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail:

[0026] In this embodiment, we take the three frame formats provided by 802.11n as an example. If different frame formats need to be identified at the receiving end, follow the figure 2 The flow detection shown is as follows:

[0027] In the first step, valid data is selected from the received data, that is, valid data after pilots are discarded. In this embodiment, in order to simplify the calculation and reduce the delay, half of the data of a symbol is selected, and then the two pilot symbols included are discarded, that is, 24 of the data are selected as valid data;

[0028] In the second step, judgment is performed on the data used for judgment. That is to judge the data selected in the first step, let the selected data be d in (n), n=1, 2, . . . , 23, 24; the judgment result is det(n), n=1, 2, . . . , 23, 24. Then det(n)=(abs(real(d in (...

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Abstract

The invention provides a signal detection method for different format frames in a wireless local area network and a device thereof. The method comprises the following steps: selecting the effective data from the received data; respectively judging the effective data so as to obtain a corresponding judgment result; and weighting each judgment result by utilizing the corresponding channel information and the step of synthesizing each result after weighting to obtain the final judgment result. Because the data judgment is weighted and the final judgment result is obtained by utilizing the channel information, the detection device has excellent property even under low signal to noise ratio in a task group n (TGn) standard channel and is especially suitable to be applied to the identification of an 802.11n frame format.

Description

technical field [0001] The present invention relates to a detection method / device in a wireless local area network, in particular to a method and a device suitable for distinguishing L-SIG and HT-SIG similar to 802.11n. Background technique [0002] As the latest standard in WLAN, 802.11n not only improves carrier efficiency, but also greatly improves system stability. 802.11n guarantees compatibility with previous versions (including 802.11a\b\g) while guaranteeing performance improvement. [0003] OFDM frames in 802.11n include three formats: NON-HT, HT-mixed, and HT-greenfield. In order to easily distinguish the three different formats, the 802.11n protocol specifies the unique data structure of the three different format frames, the specific structure is as follows figure 1 shown. The difference between these three different formats is mainly due to the figure 1 In the HT-SIG field, because this field adopts a special modulation method, the constellation point of BPS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/02
Inventor 姚小城方治石寅
Owner 中科威发半导体(苏州)有限公司