Timing synchronization method applied to OFDM-WLAN radio frequency testing system

Abstract

The invention discloses a timing synchronization method applied to OFDM-WLAN radio frequency testing system; the method is as follows: firstly, using a vector signal analyzer for processing WLAN radio frequency signal emitted by a device to be tested, transforming the WLAN radio frequency signal into the digital base band signal of FS; secondly, processing the obtained digital base band signal, obtaining the rising edge position and the falling edge position of the data frame according to the change of the power value, intercepting the data between the rising edge position and the falling edge position as integrated frame data r(n); thirdly, using the obtained data r(n) and adopting L-STF for realizing timing synchronization, and computing to obtain the timing metric function M(n); finally, detecting the peak value position of the timing metric function M(n) to obtain the accurate timing estimated position. The timing synchronization method applied to OFDM-WLAN radio frequency testing system can obtain accurate timing synchronization by using L-STF only, compared with conventional method of using L-STF and L-LTF for estimating the timing position, the timing synchronization step is simplified and the synchronization precision is improved.

Description

technical field [0001] The invention relates to an OFDM-WLAN radio frequency test system, in particular to a timing synchronization method suitable for the OFDM-WLAN radio frequency test system. Background technique [0002] Wireless local area network (WLAN) is mainly used for wireless access in a local area. The earliest wireless local area network can be traced back to the ALOHANet based on packet technology developed in 1971. It is the first network technology that uses wireless transmission to replace wired transmission. The real commercialization of WLAN began in 1997 after the IEEE formulated the 802.11 standard. After years of development, WLAN technology has been deeply integrated into people's lives. [0003] The 802.11 standard is a series of wireless local area network standards developed by the Institute of Electrical and Electronics Engineers (IEEE), mainly used for local wireless communication in the 2.4GHz and 5GHz license-free frequency bands. Common versio...

AI Technical Summary

Problems solved by technology

The advantages and disadvantages of the synchronization technology will affect the overall performance of the RF test system. The traditional timing synchronization method is to combine L-STF and L-LTF. The steps are cumbersome and the timing synchronization accuracy is not high.

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