WO2021120738A1

WO2021120738A1 - Stf sending and receiving method and device, storage medium, and terminal

Info

Publication number: WO2021120738A1
Application number: PCT/CN2020/116115
Authority: WO
Inventors: 曹明伟
Original assignee: 展讯通信（上海）有限公司
Priority date: 2019-12-16
Filing date: 2020-09-18
Publication date: 2021-06-24
Also published as: CN110996342A; CN110996342B

Abstract

An STF sending and receiving method and device, a storage medium, and a terminal, wherein the STF sending method comprises: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises multiple adjacent channel groups and mapping relationships between multiple adjacent channels in each adjacent channel group and STFs, and the STFs corresponding to multiple adjacent channels in the same adjacent channel group are different; selecting the STF corresponding to the current working channel according to the current working channel and the STF parameter mapping table; send out the selected STF. The technical solution of the present invention can reduce the influence of adjacent channel interference on data transmission of the current channel and improve data transmission efficiency.

Description

STF sending and receiving method and device, storage medium and terminal

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on December 16, 2019, the application number is 2019112989811, and the invention title is "STF sending and receiving methods and devices, storage media, and terminals", the entire contents of which are incorporated by reference In this application.

Technical field

The present invention relates to the field of communication technology, in particular to an STF sending and receiving method and device, storage medium, and terminal.

Background technique

For wifi and other burst communication systems, signals are usually transmitted in separate bursts in frames, so when receiving a frame of signal, the receiving device does not know when the signal will arrive. The receiving device must first detect the frame header in time and adjust the analog gain of the receiver to an appropriate size to ensure subsequent reception and demodulation. This is the function of the Automatic Gain Control (AGC) module.

Due to the characteristics of the wifi signal frame, the 8us signal at the front end of the frame header is repeatedly generated from 10 known signals of 0.8us. That is to say, the frame header signal is repeated periodically, with a period of 0.8 us, repeated 10 times, and it is known that the 8 us signal is a short training field (Short Training Field, STF) signal. Therefore, when the frame header is detected and the gain is suitable, the receiver uses the known 8us information to identify whether the current signal is the target signal, usually the signal delay correlation detection and the correlation detection with the local sequence. If both of these two detections are passed, it is deemed to be the target signal, and subsequent reception demodulation is required. If any one of the detections fails, it is regarded as noise or interference, and the subsequent reception process is not started, and the frame detection state is returned.

The current Wi-Fi protocols include 802.11a/g and 802.11n/ac/ax, and multiple channels are allocated on the 2.4GHz and 5GHz frequency bands, each of which is at least 20MHz, so that 20MHz/40MHz/80MHz or even 160MHz broadband channels can be formed. Taking the 5GHz frequency band as an example, in a continuously available frequency range of 5170MHz-5330MHz, the center frequency of each channel is as follows: 8 20M center frequency points f _{20_1} , f _{20_2} , f _{20_3} , f _{20_4} , f _{20_5} , f _{20_6} , f _{20_7} , f _{20_8} ; four 40M center frequency points f _{40_1} , f _{40_2} , f _{40_3} , f _{40_4} ; two 80M center frequency points f _{80_1} and f _{80_2} ; and one 160M center frequency point f ₁₆₀ . If an access point (Access Point, AP) (such as device a) and a mobile phone are _{performing wifi communication on a 20MHz bandwidth with f 20_2} as the center frequency point; at the same time, there is another pair of AP (such as device b) and a computer Wi-Fi communication is performed on the 20MHz bandwidth with f _{20_3 as the center frequency point.} Then, the signal sent by the device b and the computer is adjacent channel interference to the device a and the mobile phone. When the device b and the computer send a strong signal, it may trigger the AGC of the device a or the mobile phone, and pass the inspection of the known characteristics of the frame header to start receiving demodulation.

However, adjacent channel interference causes the device a or the mobile phone to be in a wrong working state, which affects the timely recognition of the target signal and causes packet loss. That is to say, when there is strong interference in the adjacent channel, no matter whether it is an analog filter or a digital filter, the interference suppression ability of the adjacent channel is limited, so that the leakage of sufficiently strong interference signal will cause damage to the wifi equipment working in the current channel. It is very likely to trigger the AGC of the current channel wifi device, and because all wifi 802.11a/g/n/ac/ax frames have the same first 8us signal, they will pass the inspection of the known characteristics of the frame header and mistakenly Start receiving demodulation. As a result, the wifi device working on the current channel will be in a wrong working state, which will affect the timely identification of the real target signal and cause packet loss.

Summary of the invention

The technical problem solved by the present invention is how to reduce the influence of adjacent channel interference on current channel data transmission and improve data transmission efficiency.

In order to solve the above technical problems, an embodiment of the present invention provides an STF sending method. The STF sending method includes: determining an STF parameter mapping table. The STF parameter mapping table includes multiple adjacent channel groups and multiple adjacent channel groups. The mapping relationship between adjacent channels and STFs, the STFs corresponding to multiple adjacent channels in the same adjacent channel group are different; the STF corresponding to the current working channel is selected according to the current working channel and the STF parameter mapping table; the selected STF is selected Send it out.

Optionally, the multiple STFs in the STF parameter mapping table are determined offline in the following manner: For each non-zero value in the preset STF sequence, phase rotation is performed at least according to various angle combinations to obtain multiple new STFs Sequence; calculate the correlation value of every two new STF sequences; select new STF sequences whose correlation values with other new STF sequences are all less than the preset value, as the STF sequence group, for adding to the STF parameter mapping table .

Optionally, the STF parameter mapping table is determined offline in the following manner: the multiple adjacent channel groups are determined, each adjacent channel group includes multiple adjacent channels; for multiple adjacent channel groups in each adjacent channel group Adjacent channels, selecting multiple different new STF sequences from the STF sequence group, and establishing a mapping relationship with the multiple adjacent channels.

Optionally, the performing phase rotation on each non-zero value in the preset STF sequence at least according to multiple angle combinations includes: performing phase rotation according to multiple angle combinations; performing IFFT transformation on the rotated STF to obtain the result. A number of new STF sequences are described.

Optionally, the STFs corresponding to multiple adjacent channels in different adjacent channel groups are the same or different.

In order to solve the above technical problem, the embodiment of the present invention also discloses an STF receiving method. The STF receiving method includes: receiving a wireless frame signal, the wireless frame signal includes STF, and the STF is determined by the transmitting device in the following manner: OK STF parameter mapping table, the STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and STF, and STFs corresponding to multiple adjacent channels in the same adjacent channel group Different; select the STF corresponding to the current working channel according to the current working channel of the sending device and the STF parameter mapping table; perform correlation detection between the received STF and the STF corresponding to the current working channel; if the correlation detection fails, Then it is determined that the wireless frame signal is an interference signal.

Optionally, the STF receiving method further includes: determining the STF corresponding to the source channel of the interference signal as the STF of the interference channel; performing correlation detection between the STF of the interference signal and the STF of the interference channel; The result of the correlation detection determines the source of the interference signal, and the source is selected from wifi channel and noise.

Optionally, the STF receiving method further includes: if the correlation detection is passed, determining that the wireless frame signal is a target signal; and demodulating the wireless frame signal.

The embodiment of the present invention also discloses an STF sending device. The STF sending device includes: a mapping table determining module for determining an STF parameter mapping table. The STF parameter mapping table includes a plurality of adjacent channel groups and each adjacent channel group. The mapping relationship between multiple adjacent channels and STF in the same adjacent channel group corresponds to different STFs; the STF determination module is used to select the current working channel according to the current working channel and the STF parameter mapping table The STF corresponding to the channel; the STF sending module is used to send the selected STF.

The embodiment of the present invention also discloses an STF receiving device. The STF receiving device includes a receiving module for receiving a wireless frame signal, the wireless frame signal includes STF, and the STF is determined by the sending device in the following manner: Determine STF A parameter mapping table, where the STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to multiple adjacent channels in the same adjacent channel group are different Select the STF corresponding to the current working channel according to the current working channel of the sending device and the STF parameter mapping table; a correlation detection module for performing correlation detection between the received STF and the STF corresponding to the current working channel; interference The signal determining module is configured to determine that the wireless frame signal is an interference signal if it fails the correlation detection.

The embodiment of the present invention also discloses a storage medium on which computer instructions are stored, and when the computer instructions are executed, the steps of the STF sending method or the STF receiving method are executed.

The embodiment of the present invention also discloses a terminal, including a memory and a processor, the memory stores computer instructions that can run on the processor, and the processor executes the STF sending when the computer instructions are executed. The steps of the method, or the steps of the STF receiving method.

Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

In the technical solution of the present invention, the STF parameter mapping table may be pre-established. The STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF. Multiple adjacent channels in the channel group correspond to different STFs. The wifi device can search in the STF parameter mapping table through its current working channel, determine the STF corresponding to the current working channel, and send it out. Through the above-mentioned STF determination method, the STF corresponding to the current working channel can be different from the STF corresponding to the adjacent channel of the current working channel, so that the receiver of the current channel performs frame header detection even when AGC is triggered by the adjacent channel signal. The signal of the adjacent channel will not pass the detection, avoiding the signal interference of the adjacent channel, so that the receiver AGC is in the correct packet capture state, ensuring the current channel receiver to recognize the target signal in time, and reducing the packet loss rate. , Improve the efficiency of data transmission.

Further, for each non-zero value in the preset STF sequence, perform phase rotation at least according to various angle combinations to obtain multiple new STF sequences; calculate the correlation value of every two new STF sequences; select pairwise correlation The new STF sequence whose value is less than the preset value is used as the STF sequence group to be added to the STF parameter mapping table. Since there is only one STF sequence in the existing WIFI wireless communication system, the technical solution of the present invention can expand to obtain multiple STF sequences by rotating each non-zero value in the preset STF sequence with multiple angles; and then calculate the correlation value , Select the STF sequence group with a smaller correlation value, so that the STF corresponding to multiple adjacent channels in the STF parameter mapping table has a smaller correlation, so that the receiver will not perform frame header detection on the STF of the adjacent channel. Pass the detection to further reduce the interference of adjacent channels and ensure the transmission efficiency.

Description of the drawings

FIG. 1 is a flowchart of an STF sending method according to an embodiment of the present invention;

Figure 2 is a schematic diagram of a specific application scenario of an embodiment of the present invention;

FIG. 3 is a partial flowchart of an STF sending method according to an embodiment of the present invention;

4 is a flowchart of an STF receiving method according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an STF sending device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an STF receiving device according to an embodiment of the present invention.

Detailed ways

As described in the background art, adjacent channel interference causes the device a or the mobile phone to be in an incorrect working state, thereby affecting the timely recognition of the target signal, and thereby causing packet loss. That is to say, when there is strong interference in the adjacent channel, no matter whether it is an analog filter or a digital filter, the interference suppression ability of the adjacent channel is limited, so that the leakage of sufficiently strong interference signal will cause damage to the wifi equipment working in the current channel. It is very likely to trigger the AGC of the current channel wifi device, and because all wifi 802.11a/g/n/ac/ax frames have the same first 8us signal, they will pass the inspection of the known characteristics of the frame header and mistakenly Start receiving demodulation. As a result, the wifi device working on the current channel will be in a wrong working state, which will affect the timely identification of the real target signal and cause packet loss.

In the technical solution of the present invention, the STF parameter mapping table may be pre-established, and the STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF. Multiple adjacent channels in the channel group correspond to different STFs. The wifi device can search in the STF parameter mapping table through its current working channel, determine the STF corresponding to the current working channel, and send it out. Through the above-mentioned STF determination method, the STF corresponding to the current working channel can be different from the STF corresponding to the adjacent channel of the current working channel, so that the receiver of the current channel performs frame header detection even when AGC is triggered by the adjacent channel signal. The signal of the adjacent channel will not pass the detection, avoiding the signal interference of the adjacent channel, so that the receiver AGC is in the correct packet capture state, ensuring the current channel receiver to recognize the target signal in time, and reducing the packet loss rate. , Improve the efficiency of data transmission.

In order to make the above objectives, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a flowchart of an STF sending method according to an embodiment of the present invention.

The STF sending method can be used in a wifi device in a WLAN system, that is, the wifi device can execute each step shown in FIG. 1.

Specifically, the STF sending method shown in FIG. 1 may include the following steps:

Step S101: Determine the STF parameter mapping table. The STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF, and multiple adjacent channels in the same adjacent channel group The STF corresponding to the channel is different;

Step S102: Select the STF corresponding to the current working channel according to the current working channel and the STF parameter mapping table;

Step S103: Send the selected STF.

It should be pointed out that the sequence number of each step in this embodiment does not represent a limitation on the execution order of each step.

In this embodiment, the STF parameter mapping table may be pre-appointed by the wifi protocol. The STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF, and multiple adjacent channels in the same adjacent channel group have different STFs. The channels in the same adjacent channel group are adjacent channels to each other.

Specifically, the frequency spectrums between the channels that are adjacent to each other are adjacent, and the frequency spectrum ranges of the channels do not overlap.

In a specific embodiment of the present invention, the STFs corresponding to multiple adjacent channels in different adjacent channel groups may be the same or different. In other words, multiple adjacent channels in different adjacent channel groups are not adjacent channels to each other, so the same STF can be used.

For details, refer to Figure 2 to indicate the corresponding frequency bands and channels by frequency points. For example, frequency point f _{20_1} represents the leftmost 20MHz frequency band, frequency point f _{40_1} represents the leftmost 40MHz frequency band, and frequency point f _{80_1} represents the leftmost frequency band. For the 80MHz frequency band, the frequency point f _{160_1} represents the entire 160MHz frequency band, and other frequency points can be deduced by analogy, so I won’t repeat them here.

For the channel represented by the frequency point f _{20_2} , the adjacent channels are the channels represented by the frequency points f _{20_1} , f _{20_3} and f _{40_2} . When the adjacent channel has a strong signal, due to insufficient filter suppression, it will leak to the current channel, causing incorrect synchronization and demodulation, and affecting the detection of the frame header of the current channel target signal. Thus, different channels STF STF need for frequency channel allocation and frequency f _{20_2} represented f _{20_1,} f _{20_3} and f _{40_2} representation. For the channels represented by frequency points f _{20_1} , f _{20_3} and f _{40_2} are not adjacent channels, the mutual interference will basically be suppressed by the filter; _{the channels represented by frequency points f 20_3} and f _{40_2} are in-band interference There are other existing solutions, so _{the channels represented by the frequency points f 20_1} , f _{20_3} and f _{40_2} can use the same STF.

Similarly, for channel frequency _f 20_5 represented by adjacent channel is a frequency f _{20_4,} channel f _{20_6,} f _{40_2} and _f 80_1 represented, can channel allocation and frequency frequency _f 20_5 represented f _{The STFs} of the channels represented by 20_4, f _{20_6} , f _{40_2,} and f _{80_1 are different.} However, the channels represented by frequency points f _{20_4} , f _{20_6} , f _{40_2} and f _{80_1} are not adjacent channels, so the same STF can be used. Other frequency points also have corresponding constraint relationships, which are no longer cumbersome.

In the specific implementation of step S101, the wifi device may determine the STF parameter mapping table through the wifi protocol. Specifically, the STF parameter mapping table can be imported into the wifi device in advance.

The wifi device can transmit data on the current working channel. For example, the wifi device can work on _{the channel represented by the frequency point f 20_2} in FIG. 2, that is, the current working channel of the wifi device is the channel represented by the frequency point f _{20_2} .

Since the STF parameter mapping table includes the STF corresponding to each channel, in the specific implementation of step S102, the wifi device can search in the STF parameter mapping table, that is, according to multiple adjacent channels in each adjacent channel group The mapping relationship with STF is searched, and the STF corresponding to the current working channel is obtained.

Specifically, step S101 and step S102 may be executed by the baseband of the wifi device in the process of generating digital signals.

Furthermore, in the specific implementation of step S103, the selected STF can be sent out. Specifically, the digital signal generated by the baseband includes the selected STF, that is, the first 8us of the digital signal is the selected STF; after the digital signal is generated at the baseband, it can be converted into an analog signal by digital-to-analog conversion and input into the radio frequency system for processing. Operations such as spectrum shifting, filtering, and amplification are finally transmitted through the antenna.

In this embodiment, for the receiver that receives the digital signal, even if the AGC is triggered by the digital signal of the adjacent channel, the STF in the digital signal of the adjacent channel is different from the STF in the digital signal of the current working channel. The known characteristics of the frame header can identify the digital signal of the adjacent channel as an interference signal, so as to continue to be in the frame header detection state, and obtain the target signal (that is, the digital signal of the current working channel) in time.

In the embodiment of the present invention, the STF corresponding to the current working channel can be different from the STF corresponding to the adjacent channel of the current working channel through the above-mentioned STF determination method, so that the receiver of the current channel can be different even when the AGC is triggered by the adjacent channel signal. During the frame header detection, the signal of the adjacent channel will not pass the detection, avoiding the signal interference of the adjacent channel, so that the receiver AGC is in the correct packet capture state, and the current channel receiver can recognize the target signal in time. Reduce the packet loss rate and improve the efficiency of data transmission.

In a non-limiting embodiment of the present invention, referring to FIG. 3, multiple STFs in the STF parameter mapping table can be determined offline in the following manner:

Step S301: For each non-zero value in the preset STF sequence, perform phase rotation at least according to various angle combinations to obtain multiple new STF sequences;

Step S302: Calculate the correlation value of every two new STF sequences;

Step S303: Select a new STF sequence whose correlation values with other new STF sequences are all less than a preset value as an STF sequence group for adding to the STF parameter mapping table.

Wherein, performing phase rotation on each non-zero value in the preset STF sequence according to multiple angle combinations refers to rotating the phase of each non-zero value by the same or different angle.

In this embodiment, the preset STF sequence may be agreed upon by the existing wifi protocol, and the preset STF sequence may represent the frequency domain value from the -26th subcarrier to the 26th subcarrier. Specifically, the preset STF sequence S _{-26, 26} can be expressed by the following formula:

Since the wifi protocol requires the length of the STF sequence, the length of the STF sequence is 64, and the frequency domain length of the preset STF sequence is 53, therefore, the preset STF sequence is extended, and the length of the extended STF sequence is 64. That is, the first 6 bits and the back 5 bits of the above-mentioned preset STF sequence are supplemented with the frequency domain value 0.

In the specific implementation of step S301, each non-zero value in the preset STF sequence is phase-rotated according to various angle combinations. Specifically, the -24th, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, and 24th subcarrier values in the preset STF sequence are combined according to various angles. Independent phase rotation, multiple angles can be any implementable angles such as 45 degrees, 60 degrees, and 90 degrees.

In the specific implementation of step S302, the correlation values of every two new STF sequences obtained in the above steps are calculated. Specifically, the following formula can be used to calculate the correlation value C(l) of the two new STF sequences x{n} and y{n}:

l=0,1,...,63; n+1=(n+1)mod64, where x{n} and y{n} are two new STF sequences, n=0-63.

Furthermore, in the specific implementation of step S303, a new STF sequence whose correlation value with other new STF sequences is less than a preset value can be selected as the STF sequence group. The correlation value less than the preset value means that for all ls in the above formula, the correlation value C(l) is less than the preset value.

It should be noted that the preset value can be set and adjusted according to the actual application environment, which is not limited in the embodiment of the present invention.

Since there is only one TF sequence in the existing wireless communication system, the embodiment of the present invention can expand to obtain multiple STF sequences by rotating each non-zero value in the preset STF sequence at multiple angles; and then by calculating the correlation value, Select the STF sequence group with the smaller pairwise correlation value, so that the STF corresponding to multiple adjacent channels in the STF parameter mapping table has a smaller correlation, so that the receiver does not perform frame header detection on the STF of the adjacent channel. It will pass the test to further reduce the interference of adjacent channels and ensure the transmission efficiency.

Further, referring to FIG. 3 continuously, the STF parameter mapping table can be determined offline in the following manner:

Step S304: Determine the multiple adjacent channel groups, and each adjacent channel group includes multiple adjacent channels;

Step S305: For multiple adjacent channels in each adjacent channel group, select multiple different new STF sequences from the STF sequence group, and establish a mapping relationship with the multiple adjacent channels.

In the specific implementation of step S304, for each channel, its adjacent channel group is determined, and the channels in the same adjacent channel group are adjacent channels to each other.

2 together, for _{the channel represented by the frequency point f 20_2} , the adjacent channels are the channels represented by the frequency points f _{20_1} , f _{20_3} and f _{40_2} , then the adjacent channel group 1 may include the frequency points f _{20_2} and f _{20_1} channel indicated; adjacent channel set 2 may include a frequency f _{20_2,} f _{20_3} channel indicated; adjacent channel set 3 may include a channel frequency f _{20_2} and f _{40_2} indicated.

Similarly, for _{the channel represented by the frequency point f 20_5} , the adjacent channels are the channels represented by the frequency points f _{20_4} , f _{20_6} , f _{40_2} and f _{80_1} , then the adjacent channel group 4 can include the frequency points f _{20_5} , f _{20_4} The adjacent channel group 5 may include _{the channels represented by the frequency points f 20_5} and f _{20_6} ; the adjacent channel group 6 may include _{the channels represented by the frequency points f 20_5} and f _{40_2} ; the adjacent channel group 7 may include _Channels represented by frequency points f _{20_5} and f 80_1. The other frequency points can be deduced by analogy.

In the specific implementation of step S305, different STF sequences are assigned to multiple adjacent channels in the adjacent channel group, that is, multiple adjacent channels in the adjacent channel group correspond to different STFs.

Further, step S301 shown in FIG. 3 may specifically include the following steps: performing phase rotation according to various angle combinations; performing IFFT transformation on the rotated STF to obtain the multiple new STF sequences.

In specific implementation, the digital signal sent by the wifi device through the transmitter is a time-domain signal. When processing the digital signal, the STF can be converted into a time-domain sequence through IFFT, and then subsequent processing steps are performed.

Referring to FIG. 4, the embodiment of the present invention also discloses an STF receiving method. The STF receiving method can be used for the wifi device in the WLAN system, that is, the receiver of the wifi device can perform the steps shown in FIG. 4.

Specifically, the STF receiving method may include the following steps:

Step S401: Receive a wireless frame signal, where the wireless frame signal includes STF,

Step S402: Perform correlation detection between the received STF and the STF corresponding to the current working channel;

Step S403: If the correlation detection is not passed, it is determined that the wireless frame signal is an interference signal.

In this embodiment, the receiver of the wifi device works on the current working channel. The wireless frame signal may come from the current working channel, or it may come from an adjacent channel of the current working channel. That is to say, when the adjacent channel of the current working channel sends a larger signal, the receiver will trigger AGC.

In specific implementation, when the receiver detects the known signal of the frame header, that is, when the received STF is related to the STF corresponding to the current working channel, the current working channel is different from the STF of its adjacent channel, so the related detection is The result will not pass the threshold, and the digital signal of the adjacent channel will not be determined as the target signal by the receiver, that is, it is determined that the wireless frame signal is an interference signal. In this case, the receiver stops subsequent work, and instead searches for the target signal (that is, the digital signal of the current working channel) frame header again. The embodiments of the present invention can help the receiver to better combat adjacent channel interference.

Further, the STF receiving method may further include the following steps: determining the STF corresponding to the source channel of the interference signal as the STF of the interference channel; performing correlation detection between the STF of the interference signal and the STF of the interference channel ; The source of the interference signal is determined according to the result of the relevant detection, and the source is selected from the wifi channel and noise.

In this embodiment, the receiver can perform delay-related detection of the interference signal, that is, use the STF of the interference channel (that is, the source channel of the interference signal) and the frame header of the interference signal to perform correlation detection to confirm whether the detected signal is a neighbor. Road interference. In other words, if the relevant detection is passed, it means that the interference signal comes from the interference channel, and the source of the interference signal is the wifi signal of the wifi channel; otherwise, it means that the source of the interference signal is other signals such as noise or single tone.

The embodiment of the present invention helps the receiver to perform further operations, such as clear channel assessment; in this case, the receiver can notify the CCA that the current energy is generated by the adjacent channel.

Further, the STF receiving method may further include the following steps: if the correlation detection is passed, determining that the wireless frame signal is a target signal; demodulating the wireless frame signal.

FIG. 5 is a schematic structural diagram of an STF sending apparatus according to an embodiment of the present invention. Referring to FIG. 5, the STF sending device 50 may include:

The mapping table determining module 501 is used to determine the STF parameter mapping table. The STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF. The same adjacent channel group The STFs corresponding to multiple adjacent channels are different;

The STF determining module 502 is configured to select the STF corresponding to the current working channel according to the current working channel and the STF parameter mapping table;

The STF sending module 503 is used to send the selected STF.

In the embodiment of the present invention, the STF corresponding to the current working channel can be different from the STF corresponding to the adjacent channel of the current working channel through the above-mentioned STF determination method, so that the receiver of the current channel can be different even when the AGC is triggered by the adjacent channel signal. When the frame header is detected, the signal of the adjacent channel will not pass the detection, avoiding the signal interference of the adjacent channel, ensuring the timely identification of the target signal by the current channel receiver, reducing the packet loss rate, and improving the data transmission efficiency.

FIG. 6 is a schematic structural diagram of an STF receiving device according to an embodiment of the present invention. Referring to FIG. 6, the STF receiving device 60 may include:

The receiving module 601 is configured to receive a wireless frame signal, where the wireless frame signal includes STF;

The correlation detection module 602 is configured to perform correlation detection between the received STF and the STF corresponding to the current working channel;

The interference signal determining module 603 is configured to determine that the wireless frame signal is an interference signal if it fails the relevant detection.

In a specific embodiment, the STF receiving device 60 may further include: an interference channel STF determination module (not shown in the figure) to determine the STF corresponding to the source channel of the interference signal as the STF of the interference channel; a detection module ( (Not shown in the figure) to perform correlation detection between the STF of the interference signal and the STF of the interference channel; a signal type determination module (not shown in the figure) is used to determine the source of the interference signal according to the result of the related detection, The source is selected from wifi channel and noise.

In a specific embodiment, the STF receiving device 60 may further include: a target signal determining module (not shown in the figure) for determining that the wireless frame signal is a target signal if the relevant detection is passed; a demodulation module (not shown in the figure) ) To demodulate the wireless frame signal.

For more details about the working principles and working methods of the STF sending device 50 and the STF receiving device 60, reference may be made to the related descriptions in FIGS. 1 to 4, and details are not repeated here.

The embodiment of the present invention also discloses a storage medium. The storage medium is a computer-readable storage medium on which computer instructions are stored. When the computer instructions are executed, the method shown in FIG. 1, FIG. 3, or FIG. 4 can be executed. A step of. The storage medium may include ROM, RAM, magnetic disk or optical disk, etc. The storage medium may also include non-volatile memory (non-volatile) or non-transitory memory, etc.

The embodiment of the present invention also discloses a terminal. The terminal may include a memory and a processor, and computer instructions that can run on the processor are stored in the memory. The processor may execute the steps of the method shown in FIG. 1, FIG. 3, or FIG. 4 when running the computer instruction. The terminal includes, but is not limited to, terminal devices such as mobile phones, computers, and tablets.

Although the present invention is disclosed as above, the present invention is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

An STF sending method, characterized in that it includes:

Determine the STF parameter mapping table. The STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF. The multiple adjacent channels in the same adjacent channel group correspond to multiple adjacent channels. STF is different;

Selecting the STF corresponding to the current working channel according to the current working channel and the STF parameter mapping table;

Send the selected STF.
The STF sending method according to claim 1, characterized in that multiple STFs in the STF parameter mapping table are determined offline in the following manner:

For each non-zero value in the preset STF sequence, perform phase rotation at least according to various angle combinations to obtain multiple new STF sequences;

Calculate the correlation value of every two new STF sequences;

A new STF sequence whose correlation value with other new STF sequences is less than a preset value is selected as the STF sequence group for adding to the STF parameter mapping table.
The STF sending method according to claim 2, wherein the STF parameter mapping table is determined offline in the following manner:

Determining the multiple adjacent channel groups, each adjacent channel group including multiple adjacent channels;

For multiple adjacent channels in each adjacent channel group, multiple different new STF sequences are selected from the STF sequence group, and a mapping relationship is established with the multiple adjacent channels.
The STF sending method according to claim 2, wherein said performing phase rotation at least according to a combination of multiple angles comprises:

Perform phase rotation according to various angle combinations;

Perform IFFT transformation on the rotated STF to obtain the multiple new STF sequences.
The STF sending method according to claim 1, wherein the STFs corresponding to multiple adjacent channels in different adjacent channel groups are the same or different.
An STF receiving method, characterized in that it includes:

Receive a wireless frame signal, the wireless frame signal includes STF, the STF is determined by the sending device in the following manner: determine the STF parameter mapping table, the STF parameter mapping table includes multiple adjacent channel groups and each adjacent channel group The mapping relationship between multiple adjacent channels and STF in the same adjacent channel group corresponds to different STFs; the current operating channel is selected according to the current operating channel of the sending device and the STF parameter mapping table Corresponding STF;

Perform correlation detection between the received STF and the STF corresponding to the current working channel;

If it fails the correlation detection, it is determined that the wireless frame signal is an interference signal.
The STF receiving method according to claim 6, further comprising:

Determine the STF corresponding to the source channel of the interference signal as the STF of the interference channel;

Performing correlation detection between the STF of the interference signal and the STF of the interference channel;

The source of the interference signal is determined according to the result of the related detection, and the source is selected from wifi channel and noise.
The STF receiving method according to claim 6, further comprising:

If the correlation detection is passed, it is determined that the wireless frame signal is a target signal;

Demodulate the wireless frame signal.
An STF sending device, characterized in that it comprises:

The mapping table determining module is used to determine the STF parameter mapping table. The STF parameter mapping table includes multiple adjacent channel groups and the mapping relationship between multiple adjacent channels in each adjacent channel group and the STF, and within the same adjacent channel group The STFs corresponding to multiple adjacent channels are different;

The STF determining module is used to select the STF corresponding to the current working channel according to the current working channel and the STF parameter mapping table;

The STF sending module is used to send the selected STF.
An STF receiving device, characterized in that it comprises:

The receiving module is configured to receive a wireless frame signal, the wireless frame signal includes STF, and the STF is determined by the sending device in the following manner: determining an STF parameter mapping table, the STF parameter mapping table including a plurality of adjacent channel groups and The mapping relationship between multiple adjacent channels in each adjacent channel group and the STF, and the multiple adjacent channels in the same adjacent channel group correspond to different STFs; selected according to the current working channel of the sending device and the STF parameter mapping table The STF corresponding to the current working channel;

The correlation detection module is used to perform correlation detection between the received STF and the STF corresponding to the current working channel;

An interference signal determining module is used to determine that the wireless frame signal is an interference signal if it fails the relevant detection.
A storage medium having computer instructions stored thereon, wherein the computer instructions execute the steps of the STF sending method according to any one of claims 1 to 5 when the computer instructions are run, or any one of claims 6 to 8 The steps of the STF receiving method.
A terminal, comprising a memory and a processor, the memory stores computer instructions that can run on the processor, wherein the processor executes any of claims 1 to 5 when the computer instructions are executed. One of the steps of the STF sending method, or the steps of the STF receiving method of any one of claims 6 to 8.