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A frame signal detection method and device for wireless local area network equipment

A wireless local area network, frame signal technology, applied in wireless communication, network topology, electrical components and other directions, can solve problems such as difficulty in frame signal detection

Active Publication Date: 2015-11-25
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem of difficult frame signal detection in the case of multipath channel for multiple frame formats of 11n, the present invention adopts a method of correlation sequence delay addition

Method used

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  • A frame signal detection method and device for wireless local area network equipment
  • A frame signal detection method and device for wireless local area network equipment
  • A frame signal detection method and device for wireless local area network equipment

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Embodiment Construction

[0031] Based on the content of the present invention, it is applied to the frame signal detection process under the OFDM mode of the IEEE802.11gIEEE802.11aIEEE802.11n protocol, and specific implementation steps are given. The receiver uses a 40M clock to sample the baseband IQ signal, and implements the baseband pair 20M bandwidth single-antenna 11n signal, 11g signal frame reception and dual-antenna STBC signal frame reception as an example. Signal Detection Structure Dependency Figure 5 The description is as follows:

[0032] 1. The receiver also samples the received baseband signal at a sampling rate of 40M. The cross-correlator performs cross-correlation operation with the input baseband signal with the short preamble sequence of 20M bandwidth. Output sequence 1.

[0033] 2. The output of sequence 1 is added after a delay of 0.8us to obtain sequence 2.

[0034] 3. After the output of sequence 2 is added after a delay of 0.4us, sequence 3 is obtained.

[0035] 4. The ...

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Abstract

The invention provides a method and a device for detecting IEEE 802.11g 802.11a 802.11n frame signals of WLAN equipment. The method includes performing correlation operation of received signals with a 20M local sequence or a 40M local sequence respectively to obtain basic correlation sequences according to the 20MHz bandwidth and the 40MHz bandwidth; performing different delay add operations on the basic correlation sequences and comparing with different set threshold values; and completing the detection process of the frame signals as long as a certain correlation value is larger than the corresponding threshold value.

Description

Technical field: [0001] An 802.11g / 802.11a / 802.11n frame signal detection method and device for wireless local area network equipment, belonging to the technical field of digital communication, relates to a method and device for realizing frame signal detection in the wireless local area network communication process. Background technique: [0002] During WLAN communication, the transmitter sends data packets intermittently in accordance with specific IEEE802.11b, 802.11g, 802.11a, 802.11n frame formats. After the receiver detects a specific frame format, it starts subsequent processes such as AGC adjustment, synchronization, demodulation, and decoding. [0003] Since the WLAN system does not have a closed-loop power control mechanism. The transmitter therefore transmits at approximately constant power each time. The signal energy range of the burst frame received by the antenna end of the receiver will vary from -95dBm to -10dBm. For weak signals smaller than -80dBm, due...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04W24/00H04W84/12
Inventor 滕炜亮孙静莫林梅邹锦芝邬泳廖峰张建国杨晓坤李鼎
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD