CN110996342B - STF transmitting and receiving method and device, storage medium and terminal - Google Patents
STF transmitting and receiving method and device, storage medium and terminal Download PDFInfo
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- CN110996342B CN110996342B CN201911298981.1A CN201911298981A CN110996342B CN 110996342 B CN110996342 B CN 110996342B CN 201911298981 A CN201911298981 A CN 201911298981A CN 110996342 B CN110996342 B CN 110996342B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
Abstract
An STF sending method, an STF receiving method, an STF sending device, a storage medium and a terminal are provided, wherein the STF sending method comprises the following steps: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of 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; and sending out the selected STF. The technical scheme of the invention can reduce the influence of adjacent channel interference on the data transmission of the current channel and improve the data transmission efficiency.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an STF transmitting and receiving method and apparatus, a storage medium, and a terminal.
Background
For wifi and other burst based communication systems, signals are typically burst-transmitted frame-by-frame independently, so the receiving device does not know when a signal arrives when it receives a frame of signals. The receiving device first needs to detect the frame header in time and adjust the analog Gain of the receiver to a proper size, so as to ensure the subsequent receiving demodulation, which is the function of an Automatic Gain Control (AGC) module.
Due to the characteristics of the wifi signal frame, namely, the 8us signal at the head of the frame is repeatedly generated by 10 known signals of 0.8 us. That is, the header signal is periodically repeated for 10 times with a period of 0.8us, and the 8us signal is known as a Short Training Field (STF) signal. Therefore, when the frame header is detected and the gain is appropriate, the receiver uses this known 8us information to identify whether the current signal is the target signal, typically the delayed correlation detection of the signal and the correlation detection with the local sequence. If the two detections are passed, the target signal is determined to be the target signal, and subsequent receiving demodulation is needed. If any detection fails, the detection is determined to be noise or interference, a subsequent receiving process is not started, and the frame detection state is returned again.
The current wifi protocol comprises 802.11a/g and 802.11n/ac/ax, and a plurality of channels are distributed on 2.4GHz and 5GHz frequency bands, each channel is at least 20MHz, so that broadband channels of 20MHz/40MHz/80MHz and even 160MHz can be formed. Taking the 5GHz band as an example, in a continuously available frequency band of 5170MHz-5330MHz, the center frequency points of each channel are as follows: 8 20M central frequency points f20_1，f20_2，f20_3，f20_4，f20_5，f20_6，f20_7，f20_8(ii) a Four 40M center frequency points f40_1，f40_2，f40_3，f40_4(ii) a Two 80M center frequency points f80_1，f80_2(ii) a And a center frequency f of 160M160. If an Access Point (AP) (e.g., device a) and a mobile phone are operating at f20_2Wifi communication is carried out on the 20MHz bandwidth which is the central frequency point; while another pair of APs (e.g., device b) and a computer are operating at f20_3Wifi communication is performed over a 20MHz bandwidth that is the center frequency point. Then, the signals from device b and the computer are the adjacent channel interference for device a and the mobile phone. When the device b and the computer send out stronger signals, the AGC of the device a or the mobile phone may be triggered, and the receiving demodulation is started through the inspection of the known characteristics of the frame header.
However, the adjacent channel interference causes the device a or the mobile phone to be in a wrong working state, thereby affecting the timely identification of the target signal and further causing packet loss. That is, when there is strong interference in the adjacent channel, since the interference suppression capability for the adjacent channel is limited due to the analog filter or the digital filter, the interference signal leaked in sufficiently strong causes interference to the wifi device operating on the current channel, so that it is highly likely to trigger the AGC of the wifi device on the current channel, and since all wifi 802.11a/g/n/ac/ax frames have the same first 8us signal, the reception demodulation is erroneously started by checking the known characteristics of the frame header. The wifi device working in the current channel is in a wrong working state, so that the real target signal is influenced to be identified in time, and packet loss occurs.
Disclosure of Invention
The invention solves the technical problem of how to reduce the influence of adjacent channel interference on the current channel data transmission and improve the data transmission efficiency.
In order to solve the foregoing technical problem, an embodiment of the present invention provides an STF transmission method, where the STF transmission method includes: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of 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; and sending out the selected STF.
Optionally, the multiple STFs in the STF parameter mapping table are determined offline in the following manner: respectively performing phase rotation on each nonzero value in the preset STF sequence at least according to a plurality of angle combinations to obtain a plurality of new STF sequences; calculating the correlation value of every two new STF sequences; and selecting the new STF sequences with the correlation values smaller than the preset value with other new STF sequences as STF sequence groups for adding the STF parameter mapping table.
Optionally, the STF parameter mapping table is determined offline in the following manner: determining the plurality of adjacent channel groups, each adjacent channel group comprising a plurality of adjacent channels; and for a plurality of adjacent channels in each adjacent channel group, selecting a plurality of different new STF sequences from the STF sequence group, and establishing a mapping relation with the plurality of adjacent channels.
Optionally, the performing, at least according to the multiple angle combinations, phase rotation on each nonzero value in the preset STF sequence includes: respectively carrying out phase rotation according to various angle combinations; IFFT-transforming the rotated STF to obtain the plurality of new STF sequences.
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, an embodiment of the present invention further discloses an STF receiving method, where the STF receiving method includes: receiving a radio frame signal, the radio frame signal comprising an STF, the STF being determined by a transmitting device by: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of 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 of the sending equipment and the STF parameter mapping table; carrying out related detection on the received STF and the STF corresponding to the current working channel; and if the correlation detection is not passed, determining 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 to be used as the STF of the interference channel; performing correlation detection on the STF of the interference signal and the STF of the interference channel; determining a source of the interference signal according to a result of the correlation detection, the source being selected from a wifi channel and noise.
Optionally, the STF receiving method further includes: if the wireless frame signal passes the correlation detection, determining the wireless frame signal as a target signal; and demodulating the wireless frame signal.
The embodiment of the invention also discloses an STF sending device, which comprises: a mapping table determining module, configured to determine an STF parameter mapping table, where the STF parameter mapping table includes multiple adjacent channel groups and mapping relationships between multiple adjacent channels in each adjacent channel group and an STF, and the STFs corresponding to the multiple adjacent channels in the same adjacent channel group are different; the STF determining module is used for selecting the STF corresponding to the current working channel according to the current working channel and the STF parameter mapping table; and the STF sending module is used for sending the selected STF.
The embodiment of the invention also discloses an STF receiving device, which comprises: a receiving module, configured to receive a radio frame signal, where the radio frame signal includes an STF, and the STF is determined by a sending device according to the following: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of 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 of the sending equipment and the STF parameter mapping table; the relevant detection module is used for carrying out relevant detection on the received STF and the STF corresponding to the current working channel; and the interference signal determining module is used for determining the wireless frame signal as an interference signal if the correlation detection is not passed.
The embodiment of the invention also discloses a storage medium, wherein a computer instruction is stored on the storage medium, and the computer instruction executes the steps of the STF sending method or the steps of the STF receiving method when running.
The embodiment of the invention also discloses a terminal, which comprises a memory and a processor, wherein the memory is stored with a computer instruction capable of running on the processor, and the processor executes the steps of the STF sending method or the STF receiving method when running the computer instruction.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the technical scheme of the invention, the STF parameter mapping table can be pre-established, the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of adjacent channels in the same adjacent channel group are different. The wifi device can search in the STF parameter mapping table through the current working channel of the wifi device, determine the STF corresponding to the current working channel, and send out. The STF corresponding to the current working channel and the STF corresponding to the adjacent channel of the current working channel can be different through the STF determining mode, so that even if the receiver of the current channel is triggered by the adjacent channel signal to perform AGC, the signal of the adjacent channel cannot be detected when frame head detection is performed, the signal interference of the adjacent channel is avoided, the AGC of the receiver is in a correct packet capturing state, the timely identification of the current channel receiver on a target signal is ensured, the packet loss rate is reduced, and the data transmission efficiency is improved.
Further, for each nonzero value in the preset STF sequence, respectively performing phase rotation at least according to a plurality of angle combinations to obtain a plurality of new STF sequences; calculating the correlation value of every two new STF sequences; and selecting a new STF sequence with pairwise correlation values smaller than a preset value as an STF sequence group for adding the STF parameter mapping table. Because only one STF sequence is arranged in the existing WIFI wireless communication system, the technical scheme of the invention can obtain a plurality of STF sequences by rotating each nonzero value in the preset STF sequence by a plurality of angles; and then selecting the STF sequence group with smaller correlation value by calculating the correlation value, so that the STFs corresponding to a plurality of adjacent channels in the STF parameter mapping table have smaller correlation, and further the receiver can not pass the detection when performing frame header detection on the STFs of the adjacent channels, thereby further reducing the interference of the adjacent channels and ensuring the transmission efficiency.
Drawings
Fig. 1 is a flowchart of an STF transmitting method according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an exemplary application scenario of the present invention;
fig. 3 is a partial flowchart of an STF transmitting method according to an embodiment of the present invention;
fig. 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 transmitting apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an STF receiving apparatus according to an embodiment of the present invention.
Detailed Description
As described in the background art, the adjacent channel interference causes the device a or the mobile phone to be in an incorrect working state, thereby affecting the timely identification of the target signal and further causing packet loss. That is, when there is strong interference in the adjacent channel, since the interference suppression capability for the adjacent channel is limited due to the analog filter or the digital filter, the interference signal leaked in sufficiently strong causes interference to the wifi device operating on the current channel, so that it is highly likely to trigger the AGC of the wifi device on the current channel, and since all wifi 802.11a/g/n/ac/ax frames have the same first 8us signal, the reception demodulation is erroneously started by checking the known characteristics of the frame header. The wifi device working in the current channel is in a wrong working state, so that the real target signal is influenced to be identified in time, and packet loss occurs.
In the technical scheme of the invention, the STF parameter mapping table can be pre-established, the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of adjacent channels in the same adjacent channel group are different. The wifi device can search in the STF parameter mapping table through the current working channel of the wifi device, determine the STF corresponding to the current working channel, and send out. The STF corresponding to the current working channel and the STF corresponding to the adjacent channel of the current working channel can be different through the STF determining mode, so that even if the receiver of the current channel is triggered by the adjacent channel signal to perform AGC, the signal of the adjacent channel cannot be detected when frame head detection is performed, the signal interference of the adjacent channel is avoided, the AGC of the receiver is in a correct packet capturing state, the timely identification of the current channel receiver on a target signal is ensured, the packet loss rate is reduced, and the data transmission efficiency is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of an STF transmission method according to an embodiment of the present invention.
The STF transmission method may be used for a wifi device in a WLAN system, that is, the wifi device may perform the steps shown in fig. 1.
Specifically, the STF transmission method shown in fig. 1 may include the following steps:
step S101: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of adjacent channels in the same adjacent channel group are different;
step S102: selecting the STF corresponding to the current working channel according to the current working channel and the STF parameter mapping table;
step S103: and sending out the selected STF.
It should be noted that the sequence numbers of the steps in this embodiment do not represent a limitation on the execution sequence of the steps.
In this embodiment, the STF parameter mapping table may be predetermined by a wifi protocol. The mapping table of the STF parameters includes a plurality of adjacent channel groups and mapping relationships between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of adjacent channels in the same adjacent channel group are different. The channels in the same adjacent channel group are adjacent channels to each other.
Specifically, the frequency spectrums between the channels of the adjacent channels are adjacent to each other, and the frequency spectrum ranges of the channels do not overlap.
In an embodiment of the present invention, the STFs corresponding to a plurality of adjacent channels in different adjacent channel groups may be the same or different. That is, the adjacent channels in different adjacent channel groups are not adjacent to each other, and thus the same STF may be used.
Referring to fig. 2, frequency points are used to represent corresponding frequency bands and channels, such as frequency point f20_1Representing the leftmost 20MHz band, frequency f40_1Representing the leftmost 40MHz band, frequency f80_1Representing the leftmost 80MHz band, frequency f160_1The frequency band of the whole 160MHz is represented, and the rest of the frequency points are analogized, and the description is omitted here.
For frequency point f20_2The adjacent channel of the represented channel is a frequency point f20_1、f20_3And f40_2The indicated channel. When the adjacent channel has a strong signal, the signal leaks to the current channel due to insufficient filter suppression degree, so that wrong synchronization and demodulation are caused, and the detection of the target signal frame header of the current channel is influenced. Therefore, it is necessary to match the frequency point f20_2Indicated channel allocation and frequency f20_1、f20_3And f40_2The STFs of the indicated channels are different. For frequency point f20_1、f20_3And f40_2The expressed channels are not in adjacent channel relation, and the mutual interference can be basically suppressed by the filter; frequency point f20_3And f40_2The channels are shown as in-band interference, which is solved by other existing solutions, so that the frequency point f20_1、f20_3And f40_2The channels represented may use the same STF.
Similarly, for frequency point f20_5The adjacent channel of the represented channel is a frequency point f20_4、f20_6、f40_2And f80_1The channel represented can be corresponding to the frequency point f20_5Indicated channel allocation and frequency f20_4、f20_6、f40_2And f80_1The STFs of the indicated channels are different. And frequency point f20_4、f20_6、f40_2And f80_1The channels represented are not contiguous and therefore the same STF may be used. Other frequency points are also corresponding constraint relations and are not redundant.
In a specific implementation of step S101, the wifi device may determine the STF parameter mapping table through a wifi protocol. Specifically, the STF parameter mapping table may be pre-imported to the wifi device.
The wifi device can transmit data in the current working channel, for example, the wifi device can work at the frequency point f in fig. 220_2The represented channel, i.e. the current working channel of the wifi device, is frequency point f20_2The indicated channel.
Since the STF parameter mapping table includes the STF corresponding to each channel, in the specific implementation of step S102, the wifi device may perform the search in the STF parameter mapping table, that is, perform the search according to the mapping relationship between the STF and the multiple adjacent channels in each adjacent channel group, to obtain the STF corresponding to the current working channel.
Specifically, steps S101 and S102 may be performed by the baseband of the wifi device in the process of generating the digital signal.
Further, in the implementation of step S103, the selected STF may 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, the digital signal can be converted into an analog signal through digital-to-analog conversion, and the analog signal is input into a radio frequency system to carry out operations such as spectrum shifting, filtering, amplification and the like, and finally is transmitted out through an antenna.
In this embodiment, even if the receiver receiving the digital signal triggers AGC by the digital signal of the adjacent channel, because the STF in the digital signal of the adjacent channel is different from the STF in the digital signal of the current operating channel, the receiver can identify the digital signal of the adjacent channel as an interference signal by using the known characteristics of the frame header, so as to continue to be in the frame header detection state and timely acquire the target signal (i.e., the digital signal of the current operating channel).
According to the embodiment of the invention, the STF corresponding to the current working channel and the STF corresponding to the adjacent channel of the current working channel are different through the STF determining mode, so that even if the receiver of the current channel is triggered by the adjacent channel signal to perform AGC, the signal of the adjacent channel cannot be detected when frame head detection is performed, the signal interference of the adjacent channel is avoided, the AGC of the receiver is in a correct packet capturing state, the timely identification of the receiver of the current channel on the target signal is ensured, the packet loss rate is reduced, and the data transmission efficiency is improved.
In a non-limiting embodiment of the present invention, referring to fig. 3, the multiple STFs in the STF parameter mapping table may be determined offline in the following manner:
step S301: respectively performing phase rotation on each nonzero value in the preset STF sequence at least according to a plurality of angle combinations to obtain a plurality of new STF sequences;
step S302: calculating the correlation value of every two new STF sequences;
step S303: and selecting the new STF sequences with the correlation values smaller than the preset value with other new STF sequences as STF sequence groups for adding the STF parameter mapping table.
The phase rotation of each non-zero value in the preset STF sequence according to the multiple angle combinations means that the phase of each non-zero value is rotated by the same or different angles.
In this embodiment, the preset STF sequence may be agreed by an existing wifi protocol, and the preset STF sequence may represent a frequency-domain value from the sub-carrier No. 26 to the sub-carrier No. 26. In particular, the STF sequence S is preset-26,26The following formula can be used to represent:
{0,0,1+j,0,0,0,-1-j,0,0,0,1+j,0,0,0,-1-j,0,0,0,-1-j,0,0,0,1+j,0,0,0,0,0,0,0,-1-j,0,0,0,-1-j,0,0,0,1+j,0,0,0,1+j,0,0,0,1+j,0,0,0,1+j,0,0}。
since the wifi protocol has a requirement on 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, the preset STF sequence is extended, and the length of the extended STF sequence is 64. I.e., the frequency-domain value 0 is complemented at the front 6 bits and the rear 5 bits of the above-mentioned preset STF sequence.
In a specific implementation of step S301, each non-zero value in the preset STF sequence is phase-rotated according to a plurality of angle combinations. Specifically, the sub-carrier values of-24, -20, -16, -12, -8, -4, 8, 12, 16, 20, and 24 in the preset STF sequence are independently phase-rotated according to various angle combinations, and the angles can be any practicable angles such as 45 degrees, 60 degrees, and 90 degrees.
In the specific implementation of step S302, the correlation value of every two new STF sequences obtained in the above steps is calculated. The following formula can be used to calculate the correlation value c (l) of the two new STF sequences x { n } and y { n }:
wherein x { n } and y { n } are two new STF sequences, and n is 0-63.
Further, in the specific implementation of step S303, a new STF sequence whose correlation value with other new STF sequences is smaller than the preset value may be selected as the STF sequence group. The correlation value being less than the preset value means that the correlation value c (l) is less than the preset value for all l in the above formula.
It should be noted that the preset value may be set and adjusted according to an actual application environment, and the embodiment of the present invention is not limited to this.
Because only one TF sequence exists in the existing wireless communication system, the embodiment of the invention can expand to obtain a plurality of STF sequences by rotating each nonzero value in the preset STF sequence at a plurality of angles; and then, by calculating the correlation values, selecting the STF sequence group with smaller pairwise correlation values, so that the STFs corresponding to a plurality of adjacent channels in the STF parameter mapping table have smaller correlation, and further, a receiver can not pass the detection when performing frame header detection on the STFs of the adjacent channels, thereby further reducing the interference of the adjacent channels and ensuring the transmission efficiency.
Further, with continued reference to fig. 3, the STF parameter mapping table may be determined offline in the following manner:
step S304: determining the plurality of adjacent channel groups, each adjacent channel group comprising a plurality of adjacent channels;
step S305: and for a plurality of adjacent channels in each adjacent channel group, selecting a plurality of different new STF sequences from the STF sequence group, and establishing a mapping relation with the plurality of adjacent channels.
In a 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.
Referring also to FIG. 2, for frequency point f20_2The adjacent channel of the represented channel is a frequency point f20_1、f20_3And f40_2The indicated channels, then the adjacent channel group 1 may comprise the frequency point f20_2、f20_1The indicated channel; adjacent channel group 2 may include frequency point f20_2、f20_3The indicated channel; adjacent channel group 3 may include frequency point f20_2And f40_2The indicated channel.
Similarly, for frequency point f20_5The adjacent channel of the represented channel is a frequency point f20_4、f20_6、f40_2And f80_1The indicated channels, the adjacent channel group 4 may then comprise the frequency point f20_5、f20_4The indicated channel; adjacent channel group 5 may include frequency point f20_5、f20_6The indicated channel; adjacent channel group 6 may include frequency point f20_5、f40_2The indicated channel; adjacent channel group 7 may include frequency point f20_5And f80_1The indicated channel. And the other frequency points are analogized in the same way.
In the specific implementation of step S305, for a plurality of adjacent channels in the adjacent channel group, different STF sequences are respectively allocated to the plurality of adjacent channels, that is, the plurality of adjacent channels in the adjacent channel group correspond to different STFs.
Further, step S301 shown in fig. 3 may specifically include the following steps: respectively carrying out phase rotation according to various angle combinations; IFFT-transforming the rotated STF to obtain the plurality of new STF sequences.
In specific implementation, a digital signal sent by wifi equipment through a transmitter is a time domain signal, and when the digital signal is processed, the STF can be converted into a time domain sequence through IFFT, and then subsequent processing steps are performed.
Referring to fig. 4, an embodiment of the present invention further discloses an STF receiving method. The STF receiving method may be used for a wifi device in a WLAN system, that is, each step shown in fig. 4 may be performed by a receiver of the wifi device.
Specifically, the STF receiving method may include the steps of:
step S401: receiving a radio frame signal, the radio frame signal comprising an STF,
step S402: carrying out related detection on the received STF and the STF corresponding to the current working channel;
step S403: and if the correlation detection is not passed, determining that the wireless frame signal is an interference signal.
In this embodiment, the receiver of the wifi device works in the current working channel. The radio frame signal may be from the current operating channel or from a channel adjacent to the current operating channel. That is, when the adjacent channel of the current working channel transmits a large signal, the receiver triggers AGC.
In specific implementation, when the receiver performs frame header known signal detection, that is, performs correlation detection on the received STF and the STF corresponding to the current working channel, since the STF of the current working channel is different from the STF of the adjacent channel, a result of the correlation detection does not pass a threshold, and the digital signal of the adjacent channel is not determined as a target signal by the receiver, that is, the radio frame signal is determined as an interference signal. In this case, the receiver stops the subsequent operation and searches the header of the target signal (i.e. the digital signal of the currently operating channel) again. The embodiment of the invention can help the receiver to better resist the adjacent channel interference.
Further, the STF receiving method may further include the steps of: determining the STF corresponding to the source channel of the interference signal to be used as the STF of the interference channel; performing correlation detection on the STF of the interference signal and the STF of the interference channel; determining a source of the interference signal according to a result of the correlation detection, the source being selected from a wifi channel and noise.
In this embodiment, the receiver may perform delay correlation detection on the interference signal, that is, perform correlation detection on the STF of the interference channel (that is, the source channel of the interference signal) and the frame header of the interference signal to determine whether the detected interference is the adjacent channel interference. That is, if the correlation detection passes, it indicates that the interference signal is from an interference channel, and the source of the interference signal is a wifi signal of the wifi channel; otherwise, the source of the interference signal is other signals such as noise or tone.
Embodiments of the present invention facilitate the receiver to do further operations, such as Clear Channel Assessment (Clear Channel assignment); in this case, the receiver may inform the CCA that the current energy is generated by the adjacent channel.
Further, the STF receiving method may further include the steps of: if the wireless frame signal passes the correlation detection, determining the wireless frame signal as a target signal; and demodulating the wireless frame signal.
Fig. 5 is a schematic structural diagram of an STF transmitting apparatus according to an embodiment of the present invention. Referring to fig. 5, the STF transmitting apparatus 50 may include:
a mapping table determining module 501, configured to determine an STF parameter mapping table, where the STF parameter mapping table includes multiple adjacent channel groups and mapping relationships between multiple adjacent channels in each adjacent channel group and an STF, and the STFs corresponding to the multiple adjacent channels in the same adjacent channel group are different;
an STF determining module 502, configured to select an STF corresponding to a current working channel according to the current working channel and the STF parameter mapping table;
and an STF sending module 503, configured to send the selected STF.
According to the embodiment of the invention, the STF corresponding to the current working channel and the STF corresponding to the adjacent channel of the current working channel are different through the STF determining mode, so that even if the receiver of the current channel is triggered by the adjacent channel signal to perform AGC, the signal of the adjacent channel cannot be detected when frame head detection is performed, the signal interference of the adjacent channel is avoided, the timely identification of the current channel receiver on the target signal is ensured, the packet loss rate is reduced, and the data transmission efficiency is improved.
Fig. 6 is a schematic structural diagram of an STF receiving apparatus according to an embodiment of the present invention. Referring to fig. 6, the STF receiving apparatus 60 may include:
a receiving module 601, configured to receive a radio frame signal, where the radio frame signal includes an STF;
a correlation detection module 602, configured to perform correlation detection on the received STF and an STF corresponding to the current working channel;
an interference signal determining module 603, configured to determine that the radio frame signal is an interference signal if the correlation detection is not passed.
In a specific embodiment, the STF receiving apparatus 60 may further include: an interference channel STF determining module (not shown) for determining an STF corresponding to a source channel of the interference signal as an STF of an interference channel; a detection module (not shown) for performing correlation detection on the STF of the interference signal and the STF of the interference channel; a signal type determining module (not shown) for determining a source of the interference signal according to the result of the correlation detection, wherein the source is selected from a wifi channel and noise.
In a specific embodiment, the STF receiving apparatus 60 may further include: a target signal determining module (not shown) for determining the wireless frame signal as a target signal if the correlation detection is passed; a demodulation module (not shown) for demodulating the wireless frame signal.
More contents of the operation principle and the operation mode of the STF sending apparatus 50 and the STF receiving apparatus 60 may refer to the related descriptions in fig. 1 to fig. 4, and are not described again here.
The embodiment of the invention also discloses a storage medium which is a computer readable storage medium and stores computer instructions, and the computer instructions can execute the steps of the method shown in fig. 1, fig. 3 or fig. 4 when running. The storage medium may include ROM, RAM, magnetic or optical disks, etc. The storage medium may further include a non-volatile memory (non-volatile) or a non-transitory memory (non-transient), and the like.
The embodiment of the invention also discloses a terminal which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the methods shown in fig. 1, 3 or 4. The terminal includes, but is not limited to, a mobile phone, a computer, a tablet computer and other terminal devices.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. An STF transmission method, comprising:
determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of 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;
sending out the selected STF;
determining a plurality of STFs in the STF parameter mapping table offline in the following manner:
respectively performing phase rotation on each nonzero value in the preset STF sequence at least according to a plurality of angle combinations to obtain a plurality of new STF sequences;
calculating the correlation value of every two new STF sequences;
and selecting the new STF sequences with the correlation values smaller than the preset value with other new STF sequences as STF sequence groups for adding the STF parameter mapping table.
2. The STF transmitting method of claim 1, wherein the STF parameter mapping table is determined offline in the following manner:
determining the plurality of adjacent channel groups, each adjacent channel group comprising a plurality of adjacent channels;
and for a plurality of adjacent channels in each adjacent channel group, selecting a plurality of different new STF sequences from the STF sequence group, and establishing a mapping relation with the plurality of adjacent channels.
3. The STF transmitting method according to claim 1, wherein the performing phase rotation respectively at least according to a plurality of angle combinations comprises:
respectively carrying out phase rotation according to various angle combinations;
IFFT-transforming the rotated STF to obtain the plurality of new STF sequences.
4. The STF transmission method of claim 1, wherein the STFs corresponding to the plurality of adjacent channels in different adjacent channel groups are the same or different.
5. An STF reception method, comprising:
receiving a radio frame signal, the radio frame signal comprising an STF, the STF being determined by a transmitting device by: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of 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 of the sending equipment and the STF parameter mapping table;
carrying out related detection on the received STF and the STF corresponding to the current working channel;
if the correlation detection is not passed, determining that the wireless frame signal is an interference signal,
determining a plurality of STFs in the STF parameter mapping table offline in the following manner:
respectively performing phase rotation on each nonzero value in the preset STF sequence at least according to a plurality of angle combinations to obtain a plurality of new STF sequences;
calculating the correlation value of every two new STF sequences;
and selecting the new STF sequences with the correlation values smaller than the preset value with other new STF sequences as STF sequence groups for adding the STF parameter mapping table.
6. The STF receiving method according to claim 5, further comprising:
determining the STF corresponding to the source channel of the interference signal to be used as the STF of the interference channel;
performing correlation detection on the STF of the interference signal and the STF of the interference channel;
determining a source of the interference signal according to a result of the correlation detection, the source being selected from a wifi channel and noise.
7. The STF receiving method according to claim 5, further comprising:
if the wireless frame signal passes the correlation detection, determining the wireless frame signal as a target signal;
and demodulating the wireless frame signal.
8. An STF transmission apparatus, comprising:
a mapping table determining module, configured to determine an STF parameter mapping table, where the STF parameter mapping table includes multiple adjacent channel groups and mapping relationships between multiple adjacent channels in each adjacent channel group and an STF, and the STFs corresponding to the multiple adjacent channels in the same adjacent channel group are different;
the STF determining module is used for selecting 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 for sending out the selected STF;
determining a plurality of STFs in the STF parameter mapping table offline in the following manner:
respectively performing phase rotation on each nonzero value in the preset STF sequence at least according to a plurality of angle combinations to obtain a plurality of new STF sequences;
calculating the correlation value of every two new STF sequences;
and selecting the new STF sequences with the correlation values smaller than the preset value with other new STF sequences as STF sequence groups for adding the STF parameter mapping table.
9. An STF receiving apparatus, comprising:
a receiving module, configured to receive a radio frame signal, where the radio frame signal includes an STF, and the STF is determined by a sending device according to the following: determining an STF parameter mapping table, wherein the STF parameter mapping table comprises a plurality of adjacent channel groups and mapping relations between a plurality of adjacent channels in each adjacent channel group and the STF, and the STFs corresponding to the plurality of 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 of the sending equipment and the STF parameter mapping table;
the relevant detection module is used for carrying out relevant detection on the received STF and the STF corresponding to the current working channel;
an interference signal determination module, configured to determine that the radio frame signal is an interference signal if the correlation detection is not passed;
determining a plurality of STFs in the STF parameter mapping table offline in the following manner:
respectively performing phase rotation on each nonzero value in the preset STF sequence at least according to a plurality of angle combinations to obtain a plurality of new STF sequences;
calculating the correlation value of every two new STF sequences;
and selecting the new STF sequences with the correlation values smaller than the preset value with other new STF sequences as STF sequence groups for adding the STF parameter mapping table.
10. A storage medium having stored thereon computer instructions, wherein said computer instructions are operable to perform the steps of the STF transmission method of any one of claims 1 to 4 or the steps of the STF reception method of any one of claims 5 to 7.
11. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the STF transmission method of any one of claims 1 to 4 or the steps of the STF reception method of any one of claims 5 to 7.
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| CN201911298981.1A CN110996342B (en) | 2019-12-16 | 2019-12-16 | STF transmitting and receiving method and device, storage medium and terminal |
| PCT/CN2020/116115 WO2021120738A1 (en) | 2019-12-16 | 2020-09-18 | Stf sending and receiving method and device, storage medium, and terminal |
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| CN112188550B (en) * | 2020-09-28 | 2022-12-06 | 展讯通信（上海）有限公司 | Data transmission method, wireless access point and computer readable storage medium |
| CN113595567B (en) * | 2021-07-23 | 2022-09-20 | 华中科技大学 | Anti-interference communication method and system |
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| EP1779552A4 (en) * | 2004-08-16 | 2009-07-08 | Zte San Diego Inc | Fast cell search and accurate synchronization in wireless communications |
| CN101515809B (en) * | 2009-03-17 | 2014-03-12 | 中兴通讯股份有限公司南京分公司 | Method and device for reducing reference signal CM in carrier wave polymerization scene |
| CN102468952B (en) * | 2010-11-08 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of very high throughput short training field processing method and system |
| US8826106B2 (en) * | 2011-06-15 | 2014-09-02 | Marvell World Trade Ltd. | Low bandwidth PHY for WLAN |
| WO2013058569A2 (en) * | 2011-10-18 | 2013-04-25 | 엘지전자 주식회사 | Method and apparatus for indicating a frame type using a preamble |
| WO2013177384A1 (en) * | 2012-05-24 | 2013-11-28 | Marvell World Trade Ltd. | Frequency domain duplication in a long-range wireless local area network |
| WO2016028000A1 (en) * | 2014-08-21 | 2016-02-25 | 엘지전자 주식회사 | Method for generating and transmitting pilot sequence in wireless communication system |
| US10320601B2 (en) * | 2014-08-25 | 2019-06-11 | Lg Electronics Inc. | Transmitting/receiving device and method in wireless communication system |
| EP4125234A1 (en) * | 2014-09-28 | 2023-02-01 | Huawei Technologies Co., Ltd. | High-efficiency short training field sequence generation method, signal sending method, signal receiving method, and apparatuses |
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| EP3668028B1 (en) * | 2015-08-06 | 2021-04-14 | LG Electronics Inc. | Method and apparatus for generating training signal by using predetermined binary sequence in wireless lan system |
| US9998263B2 (en) * | 2015-08-10 | 2018-06-12 | Intel IP Corporation | Scheduling resources for orthogonal frequency division multiple access uplink transmissions |
| CN113839760B (en) * | 2015-09-25 | 2023-03-28 | 中兴通讯股份有限公司 | Data transmission method and node |
| CN106712917B (en) * | 2015-11-17 | 2020-04-03 | 华为技术有限公司 | Data transmission method, device and system |
| CN107182076B (en) * | 2016-03-11 | 2020-12-25 | 华为技术有限公司 | Channel access method and station |
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| CN110996342B (en) * | 2019-12-16 | 2022-03-04 | 展讯通信（上海）有限公司 | STF transmitting and receiving method and device, storage medium and terminal |
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