A method for demodulating and compensating phase noise of WIFI 7 signals

Abstract

This invention discloses a method for demodulating and compensating phase noise in Wi-Fi 7 signals, belonging to the field of Wi-Fi technology. The method first generates an ideal preamble sequence according to the IEEE 802.11be protocol, and then synchronizes and estimates the carrier frequency offset based on the L-STF segment in the preamble sequence. It then obtains the modulation order and spatial multiplexing type of the data signal by analyzing the EHT-SIG field, and obtains the frequency response of the data field by analyzing the LTF field. Finally, it uses the pilot signal of the data field for phase tracking and compensation. This invention effectively solves the problem of degraded demodulation quality caused by phase noise in Wi-Fi 7 signals.

Description

Technical Field

[0001] This invention relates to the field of WIFI technology, specifically to a method for demodulating and compensating for phase noise in WIFI 7 signals. Background Technology

[0002] In IEEE 802.11be technology, the introduction of 4096QAM modulation has greatly improved throughput. However, with the expansion of the commercial WiFi 7 band to 5.6GHz, the corresponding phase noise will severely affect signal transmission and reception. This invention proposes a method for estimating phase noise using pilot subcarriers of data. Furthermore, the estimated phase noise is used to compensate for data segments. This method effectively reduces the impact of phase noise on higher-order modulation, thereby ensuring high-quality WiFi signal transmission. Summary of the Invention

[0003] In view of the above-mentioned technical problems in the prior art, the present invention provides a WIFI 7 signal demodulation and phase noise compensation method, which is reasonably designed, solves the shortcomings of the prior art, and has good effect.

[0004] To achieve the purpose of the invention, the following technical solution is adopted:

[0005] A method for demodulating and compensating phase noise of a WIFI 7 signal includes the following steps:

[0006] Step 1: Generate an ideal preamble sequence according to the IEEE 802.11be protocol, and use the L-STF in the preamble sequence for frame synchronization to obtain the synchronized signal;

[0007] Step 2: Use the L-LTF in the preamble sequence to estimate and compensate for carrier frequency offset;

[0008] Step 3: Parse the EHT-SIG field to obtain the modulation order and spatial multiplexing type of the data signal, and parse the LTF field to obtain the frequency response of the data field;

[0009] Step 4: Use the pilot signal in the data field for phase tracking and compensation.

[0010] Further, in step 1, an ideal preamble sequence L-STF signal X is generated. L-STF The synchronization point offset δ is obtained by calculating the index of the correlation peaks and then performing calculations on the baseband signal Y received by the receiver according to formula (1).

[0011]

[0012] Furthermore, step 2 includes the following sub-steps:

[0013] Step 2.1: Calculate the frequency response matrix H of the channel by calculating two consecutive OFDM symbols in the L-LTF field. L-LTF1 and H L-LTF2 ;

[0014] Step 2.2: Using the frequency response matrix H L-LTF1 and H L-LTF2 Calculate the carrier frequency error Δf;

[0015] Step 2.3: Use Δf to perform carrier frequency offset compensation.

[0016] Furthermore, step 3 includes the following sub-steps:

[0017] Step 3.1: Parse the EHT-SIG field to obtain the modulation order Q used in the data signal. m And spatial multiplexing types;

[0018] Step 3.2: Parse the LTF field to obtain the frequency response H of the data field. LTF Write it in terms of amplitude and phase:

[0019]

[0020] Where a(f,t) is the amplitude of the frequency response. The phase of the frequency response.

[0021] Furthermore, step 4 includes the following sub-steps:

[0022] Step 4.1: Calculate the frequency response at the pilot subcarrier in the data field, and calculate the phase noise according to formula (3):

[0023]

[0024] Where H(f,t) is the channel frequency response of the data field;

[0025] Step 4.2: Use the estimated phase noise to... Compensation will be provided.

[0026]

[0027] Step 4.3: The compensated channel frequency response is as follows:

[0028] H(f,t)=|H LTF (f,t)|e θ(f,t) (5).

[0029] The beneficial effects of this invention are:

[0030] The method disclosed in this invention is based on a WIFI signal processing platform and proposes a phase noise estimation and compensation method, which solves the problem of phase noise affecting the transmission of high-order modulation signals in WIFI 7 signals. Attached Figure Description

[0031] Figure 1 This is a flowchart of the WIFI 7 signal demodulation and phase noise compensation method in this invention; Detailed Implementation

[0032] The specific embodiments of the present invention will be further described below with reference to specific examples:

[0033] A method for demodulating and compensating phase noise in a WIFI 7 signal, such as Figure 1 As shown, it includes the following steps:

[0034] Step 1: Generate an ideal preamble sequence according to the IEEE 802.11be protocol, and use the L-STF in the preamble sequence for frame synchronization to obtain the synchronized signal;

[0035] In step 1, an ideal preamble sequence L-STF signal X is generated. L-STF The synchronization point offset δ is obtained by calculating the index of the correlation peaks and then performing calculations on the baseband signal Y received by the receiver according to formula (1).

[0036]

[0037] Step 2: Use the L-LTF in the preamble sequence to estimate and compensate for carrier frequency offset;

[0038] Step 2 includes the following sub-steps:

[0039] Step 2.1: Calculate the frequency response matrix H of the channel by calculating two consecutive OFDM symbols in the L-LTF field. L-LTF1 and H L-LTF2 ;

[0040] Step 2.2: Using the frequency response matrix H L-LTF1 and H L-LTF2 Calculate the carrier frequency error Δf;

[0041] Step 2.3: Use Δf to perform carrier frequency offset compensation.

[0042] Step 3: Parse the EHT-SIG field to obtain the modulation order and spatial multiplexing type of the data signal, and parse the LTF field to obtain the frequency response of the data field;

[0043] Step 3 includes the following sub-steps:

[0044] Step 3.1: Parse the EHT-SIG field to obtain the modulation order Q used in the data signal. m And spatial multiplexing types;

[0045] Step 3.2: Parse the LTF field to obtain the frequency response H of the data field. LTF Write it in terms of amplitude and phase:

[0046]

[0047] Where a(f,t) is the amplitude of the frequency response. The phase of the frequency response.

[0048] Step 4: Perform phase tracking and compensation using the pilot signals from the data field;

[0049] Step 4 includes the following sub-steps:

[0050] Step 4.1: Calculate the frequency response at the pilot subcarrier in the data field, and calculate the phase noise according to formula (3):

[0051]

[0052] Where H(f,t) is the channel frequency response of the data field;

[0053] Step 4.2: Use the estimated phase noise to... Compensation will be provided.

[0054]

[0055] Step 4.3: The compensated channel frequency response is as follows:

[0056] H(f,t)=|H LTF (f,t)|e θ(f,t) (5).

[0057] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A method for WIFI 7 signal demodulation and phase noise compensation, characterized in that, Comprising the following steps: Step 1: generating a preamble sequence according to the IEEE 802.11be protocol, using the L-STF field in the preamble sequence to realize frame synchronization of the received signal, and obtaining a synchronized WIFI signal; Step 2: using the L-LTF in the preamble sequence to perform carrier frequency offset estimation and compensation; Step 3: parsing the EHT-SIG field to obtain the modulation order and the space division multiplexing type of the data signal, and parsing the LTF field to obtain the frequency response of the data field; Step 4: using the pilot signal of the data field to perform phase tracking and compensation; In the step 3, comprising the following sub-steps: Step 3.1: parsing the EHT-SIG field to obtain the modulation order used by the data signal and space division multiplexing type; Step 3.2: Parse the LTF field to get the frequency response of the data field Write it in the form of amplitude and phase: （2） wherein is the magnitude of the frequency response, is the phase of the frequency response.

2. The method of claim 1, wherein, In the step 1, a preamble sequence L-STF signal is generated , and the baseband signal received at the receiving end is correlated with the baseband signal : （1）。 3. The method of claim 1, wherein, In the step 2, comprising the following sub-steps: Step 2.1: Calculate the frequency response matrix of the channel for the two consecutive OFDM symbols in the L-LTF field and ; Step 2.2: Utilizing the frequency response matrix and Calculating the carrier frequency error ; Step 2.3: Utilizing Carrier frequency offset compensation is performed.

4. The method of claim 1, wherein, In the step 4, comprising the following sub-steps: Step 4.1: calculating the frequency response at the pilot subcarrier of the data field, and calculating the phase noise according to formula (3): （3） wherein channel frequency response for the data field; Step 4.2: Compensate the phase noise estimate for the phase noise estimate. （4） Step 4.3: the compensated channel frequency response is: （5）。

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