Data processing method of WiFi integrated tester based on IEEE802.11n standard

A technology of data processing and comprehensive tester, which is applied in the field of signal processing and can solve problems such as performance degradation at the receiving end

Active Publication Date: 2015-07-29
SOUTHEAST UNIV
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Problems solved by technology

[0004] The signal will be seriously affected by the channel during the wireless chann

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  • Data processing method of WiFi integrated tester based on IEEE802.11n standard
  • Data processing method of WiFi integrated tester based on IEEE802.11n standard
  • Data processing method of WiFi integrated tester based on IEEE802.11n standard

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Embodiment Construction

[0045] The specific implementation scheme will be further elaborated below in conjunction with the drawings.

[0046] The data processing process in the WiFi tester is the same as the general receiver processing process. figure 2 Block diagram of the receiver based on IEEE802.11n protocol. First, the received signal is converted into a baseband signal through a down-conversion, and undergoes AGC (automatic gain control) and analog-to-digital conversion, and then frame detection and time domain synchronization are performed, so that the system can obtain the signal arrival time, and then carry out the carrier wave of the received signal Frequency offset compensation. After that, the cyclic prefix is ​​removed from the signal, and the signal is converted from the time domain to the frequency domain through FFT (Fast Fourier Transformation). After FFT transformation, the received long training sequence is used for channel estimation, and finally the original signal is obtained thr...

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Abstract

The invention discloses a data processing method of a WiFi integrated tester based on the IEEE802.11n standard, and aims at processing data accurately in real time and reflecting performance of pieces to be reflected when the data received by the WiFi integrated tester satisfies the IEEE802.11n standard. The method comprises that accurate synchronization can be realized by combined timing synchronization based on cross correlation of energy packet detection and local training sequence; a frequency offset value can be accurately estimated by maximum likelihood estimation of carrier-wave frequency offset assisted by time-domain data; and channel characteristic can be accurately estimated via LS channel estimation and fitting. One frame of effective data is cut from received data, frequency compensation is carried out on the data after timing synchronization and frequency offset estimation, data is demodulated after removing the cyclic prefix, channel estimation is carried out, the signal domain is parsed, phase compensation is carried out on the data to obtain the EVM, and thus, the performance of the piece to be tested is accurately reflected.

Description

Technical field [0001] The invention belongs to the field of signal processing, data processing and instrumentation measurement industry, and specifically relates to a data processing method based on the IEEE802.11n standard in a WiFi comprehensive measuring instrument. Background technique [0002] In the past ten years, wireless local area network technology has the characteristics of high speed, flexible and low-cost layout, and has been widely used in many places, with a huge market scale and a wide range of user groups. With the development of wireless local area networks, the demand for wireless network chips will continue to increase. A reliable and efficient WiFi tester is particularly important for accurate detection of the chip. At present, WiFi comprehensive testers in the global market are basically monopolized by foreign manufacturers, but my country is still in a backward position in the field of research and development of WiFi comprehensive testers. Therefore, it...

Claims

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Application Information

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IPC IPC(8): H04W24/02
CPCH04W24/02
Inventor 裴文江蒋春霞郝金光
Owner SOUTHEAST UNIV
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