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A method for estimating channel coefficients of 802.11ax protocol 2x mode

A technology of channel coefficients and modes, applied in the field of channel estimation, can solve the problem of large time overhead, and achieve the effect of improving the accuracy and minimizing the mean square error.

Active Publication Date: 2021-12-10
江苏软仪科技集团股份有限公司
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Problems solved by technology

Since the HE-LTF symbol in 11ax is up to 16 microseconds, the time overhead of each HE-LTF symbol in 11ax is 4 times larger than that in 11ac

Method used

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  • A method for estimating channel coefficients of 802.11ax protocol 2x mode
  • A method for estimating channel coefficients of 802.11ax protocol 2x mode
  • A method for estimating channel coefficients of 802.11ax protocol 2x mode

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Embodiment Construction

[0019] The present invention will be further explained below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, a method for estimating 802.11ax protocol 2x mode channel coefficients comprises the following steps:

[0021] Step 1: Use the least squares algorithm (LS algorithm) to analyze any adjacent pilot signal (p 1 ,p 2 ) to perform channel estimation, and obtain the channel coefficient corresponding to the pilot signal (h 1 , h 2 ).

[0022] Step 2: Using the channel coefficient (h 1 , h 2 ) for linear interpolation, set the linear interpolation coefficient as (w 1 ,w 2 ), generate pilot signal p o The channel coefficient h at o .

[0023] Step 3: Use the channel coefficient h o For the pilot signal p in the next OFDM symbol o Perform signal equalization.

[0024] Step 4: Make a hard decision on the equalized signal, and obtain the corresponding constellation points after the decision.

[0025] Step 5: Calculate the sum of the...

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Abstract

The invention discloses a method for estimating 2x mode channel coefficients of 802.11ax protocol. Based on the linear interpolation method, the method adopts a feedback method to correct unknown channel coefficients in 2x mode, so as to achieve the mean square error of the estimated coefficient values. minimize. Compared with the linear interpolation / polynomial interpolation algorithm, the method improves the accuracy of channel estimation in the 11ax system through multiple iterations, and better meets the requirements of signal reception.

Description

technical field [0001] The present invention relates to digital receiver technology in 802.11ax, in particular to a channel estimation method used in 802.11ax. Background technique [0002] With the increasing demand for high-speed and multimedia data services, people's requirements for high-speed network speed are becoming more and more stringent. The next-generation 802.11ax protocol can provide multiple access users with a transmission rate of up to 10Gbps. Because combining diversity, coherent demodulation and space-time decoding in MIMO-OFDM system all need to know the channel state information CSI (Channel State Information) accurately, and the accuracy of channel estimation determines the performance of coherent demodulation system, so channel estimation is One of the key technologies of the MIMO-OFDM system. [0003] In order to support channel estimation of 11ax, the preamble in the frame structure similar to 11ac and 11ax contains multiple HE-LTF symbols, the numb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
CPCH04L25/0224H04L25/024H04L25/025H04L25/0264H04L25/0292
Inventor 祝超邓伟
Owner 江苏软仪科技集团股份有限公司
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