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Channel estimation method for IEEE 802.11ac radio frequency conformance testing

A channel estimation and consistency technology, applied in multi-frequency code systems, transmission monitoring, electrical components, etc., can solve problems such as wasting bandwidth, reducing channel transmission effectiveness, and failing to meet WLAN RF testing.

Active Publication Date: 2015-05-13
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

However, the preamble training sequence reduces the effectiveness of channel transmission, wastes bandwidth, and the number of pilot symbols is small. Traditional channel estimation methods cannot meet the needs of WLAN radio frequency testing.

Method used

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  • Channel estimation method for IEEE 802.11ac radio frequency conformance testing
  • Channel estimation method for IEEE 802.11ac radio frequency conformance testing
  • Channel estimation method for IEEE 802.11ac radio frequency conformance testing

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Embodiment Construction

[0036] Below in conjunction with embodiment the present invention will be further described.

[0037] figure 1 Among them, the signal modulated by the transmitter reaches the receiver through channel transmission. The signal processing process at the receiver mainly includes: timing synchronization, carrier frequency synchronization, cyclic prefix removal, FFT transformation, channel estimation and equalization, demapping, deinterleaving, Decoding and descrambling, and finally recovering the transmitted data at the transmitting end.

[0038] figure 2 Among them, the frame structure adopted by 802.11ac includes traditional preamble, very high speed preamble and data field. The traditional preamble includes: traditional short training sequence L-STF, traditional long training sequence L-LTF, and L-SIG for user description data and modulation and coding MCS strategy length; very high-speed preamble includes: VHT-SIG-A and VHT-SIG-B for describing data and modulation and coding...

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Abstract

The invention discloses a channel estimation method for IEEE 802.11ac radio frequency conformance testing. The method includes the steps of obtaining an initial value of channel estimation through the weighted average of a traditional long training sequence L-LTE of a 802.11ac protocol physical layer and a high-speed long training sequence VHT-LTF; demodulating received data into standard points on a constellation, calculating the Euclidean distance from the received data to the nearest constellation point, and selecting a plurality of data of the smallest Euclidean distance as auxiliary pilot frequency; combining pilot frequency with the auxiliary pilot frequency, and calculating to obtain channel frequency response of all data subcarriers through the least square fit criterion; updating channel response of the current frame through variable coefficient iteration; estimating data of the sending end on the basis of the least square fit criterion. The channel estimation method for IEEE 802.11ac radio frequency conformance testing achieves WLAN (Wireless Local Area Network) radio frequency conformance testing and narrows vector error margin to achieve better conformance testing results.

Description

technical field [0001] The invention relates to the field of signal processing and the field of instrumentation measurement, in particular to a channel estimation method for IEEE802.11ac radio frequency consistency test. Background technique [0002] With the establishment of the IEEE 802.11ac protocol and the rapid development of smart mobile terminals, more and more WLANs are deployed, and the market has a huge demand for 802.11ac devices. Therefore, for the next generation of Wi-Fi wireless access equipment, independent research and development of efficient, reliable and intelligent WLAN production line comprehensive testing equipment has become an important research field. [0003] IEEE 802.11ac is considered to be the Wi-Fi standard in the 5G era. It is established on the basis of 802.11a, including continuing to use the 5GHz frequency band of 802.11a, and is backward compatible. 802.11ac is the successor of 802.11n, which adopts wider radio frequency bandwidth (up to ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B17/309
Inventor 裴文江韩娜郝金光
Owner SOUTHEAST UNIV
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