CN116346556B

CN116346556B - Signal mode detection method, device, equipment and medium in multimode receiver

Info

Publication number: CN116346556B
Application number: CN202310601879.4A
Authority: CN
Inventors: 朴成哲
Original assignee: Gaotuoxunda Beijing Microelectronics Co ltd
Current assignee: Gaotuoxunda Beijing Microelectronics Co ltd
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-07-25
Anticipated expiration: 2043-05-26
Also published as: CN116346556A

Abstract

The application provides a method, a device, equipment and a medium for detecting a signal mode in a multimode receiver, and relates to the technical field of wireless communication, wherein the method comprises the following steps: acquiring a target frequency domain signal corresponding to a main channel position and corresponding to a wireless signal of a current frame; determining a correlation value and average power, and determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement according to the ratio of the correlation value to the average power; if the similarity requirement is met, determining whether the second target frequency domain signal meets the preset mode requirement; if the preset mode requirement is met, determining a signal in an efficient mode; if the preset mode requirement is not met, determining a signal in a non-efficient mode; and determining a sub-mode in the high-efficiency mode or the non-efficiency mode according to the length information or the modulation mode of the second target frequency domain signal. By adopting the method, the device, the equipment and the medium for detecting the signal mode in the multimode receiver, the problem of low detection precision of the signal mode near sensitivity is solved.

Description

Signal mode detection method, device, equipment and medium in multimode receiver

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method, an apparatus, a device, and a medium for detecting a signal mode in a multimode receiver.

Background

The 802.11 multimode receiver may support 4 types of physical layer protocol data units (Presentation Protocol Data Unit, PPDUs) simultaneously, these 4 types being Legacy Mode, mixed Mode, very High Throughput Mode (VHT), high Efficiency (HE), respectively. The VHT mode can be further divided into a VHT-SU mode and a VHT-MU mode, the VHT-MU mode corresponds to the situation of multi-user MU-MIMO, and the HE mode can be further divided into an HE-SU mode, an HE-ER-SU mode, an HE-MU mode and an HE-TB mode. In order to support the above multiple PPDU types at the same time, mode detection is required when receiving a wireless signal, so as to distinguish which frame type is specific according to the characteristics of the PPDU, and then, signal processing is performed in the next step according to the frame type, so as to obtain MAC frame data carried by the signal. The PPDU mode detection has the following difficulties: when the received wireless signal is near sensitivity, ambiguity in the signal characteristics is often accompanied.

In the prior art, the accuracy is poor when PPDU mode detection is performed near the sensitivity, so that the mode detection accuracy is low.

Disclosure of Invention

In view of the foregoing, an object of the present application is to provide a method, apparatus, device and medium for detecting a signal mode in a multimode receiver, so as to solve the problem of low detection accuracy when detecting a signal mode near sensitivity.

In a first aspect, an embodiment of the present application provides a method for detecting a signal mode in a multimode receiver, including:

acquiring a frequency domain signal corresponding to a wireless signal of a current frame, selecting a target frequency domain signal corresponding to a main channel position from the frequency domain signals, wherein the target frequency domain signal comprises a first target frequency domain signal and a second target frequency domain signal, the first target frequency domain signal is a target frequency domain signal corresponding to a first symbol in the wireless signal of the current frame, the second target frequency domain signal is a target frequency domain signal corresponding to a second symbol in the wireless signal of the current frame, and the wireless signal of the current frame is an orthogonal frequency division multiplexing signal;

determining correlation values of a first additional data subcarrier set and a second additional data subcarrier set, determining average powers corresponding to the first pilot frequency data subcarrier set and the second pilot frequency data subcarrier set, determining whether a first target frequency domain signal and a second target frequency domain signal meet a similarity requirement according to a ratio of the correlation values to the average powers, wherein the first additional data subcarrier set is a set formed by data subcarriers in the first target frequency domain signal and additional subcarriers, the second additional data subcarrier set is a set formed by data subcarriers in the second target frequency domain signal and additional subcarriers, the additional subcarriers are unique subcarriers in an efficient mode, the first pilot frequency data subcarrier set is a set formed by data subcarriers in the first target frequency domain signal and pilot frequency subcarriers, and the second pilot frequency data subcarrier set is a set formed by data subcarriers in the second target frequency domain signal and pilot frequency subcarriers;

If the similarity requirement is met, determining whether the second target frequency domain signal meets the preset mode requirement according to the transmission rate and length information, wherein the preset mode requirement refers to the requirement of the high-efficiency mode on the signaling information;

if the preset mode requirement is met, determining that the wireless signal of the current frame is a signal in an efficient mode;

if the preset mode requirement is not met, determining that the wireless signal of the current frame is a signal in a non-efficient mode;

determining the sub-mode type in the high-efficiency mode according to the length information of the second target frequency domain signal, and determining the sub-mode type in the non-high-efficiency mode according to the modulation mode of the second target frequency domain signal.

Optionally, determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement according to the ratio of the correlation value to the average power includes: determining whether the ratio of the absolute value of the correlation value to the average power is greater than a first set threshold; if the first set threshold is larger than the second set threshold, determining that the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement.

Optionally, determining the average power corresponding to the first pilot data subcarrier set and the second pilot data subcarrier set includes: taking the sum of the powers corresponding to all the subcarriers in the first pilot data subcarrier set as first power; taking the sum of the powers corresponding to all the subcarriers in the second pilot data subcarrier set as second power; the average value of the first power and the second power is taken as the average power.

Optionally, determining the correlation value of the first set of additional data subcarriers with the second set of additional data subcarriers includes: for each subcarrier in the first additional data subcarrier set, carrying out conjugate correlation processing on the subcarrier and the subcarrier at the corresponding position in the second additional data subcarrier set; the complex values are obtained by adding the results of the conjugate correlation processing, and the complex values are used as correlation values.

Optionally, determining whether the second target frequency domain signal meets the preset mode requirement according to the transmission rate and the length information includes: after the first target frequency domain signal and the second target frequency domain signal are combined, decoding the combined frequency domain signal to obtain first decoding information, wherein the first decoding information comprises first transmission rate and first length information; determining whether the first transmission rate and the first length information meet a set condition, wherein the set condition is that the transmission rate is equal to 11 and the result of taking the modulus of the length information to 3 is 1 or 2; if the set condition is met, determining that the preset mode requirement is met.

Optionally, determining the sub-mode type in the efficient mode according to the length information of the second target frequency domain signal includes: decoding the second target frequency domain signal to obtain second decoding information, wherein the second decoding information comprises second length information; determining whether the result obtained by taking the modulus of the second length information to 3 is 1; if the result is 1, determining that the wireless signal of the current frame is in a high-efficiency single-user frame mode or a high-efficiency response frame mode; if the result is not 1, determining that the wireless signal of the current frame is an efficient extended single-user frame mode or an efficient multi-user frame mode.

Optionally, determining the sub-mode type in the non-efficient mode according to the modulation mode of the second target frequency domain signal includes: determining whether a modulation mode of the second target frequency domain signal is quadrature binary phase shift keying and whether a first transmission rate corresponding to the first target frequency domain signal is 11; if the modulation mode is determined to be quadrature binary phase shift keying and the first transmission rate is equal to 11, determining that the wireless signal of the current frame is a mixed mode in a non-efficient mode; if the modulation mode is determined not to be quadrature binary phase shift keying or the first transmission rate is determined not to be equal to 11, determining that the wireless signal of the current frame is in an extension mode or a high throughput mode under the non-efficient mode.

Optionally, the target frequency domain signal includes a third target frequency domain signal and a fourth target frequency domain signal; determining whether the current frame wireless signal is in a high-efficiency single-user frame mode or a high-efficiency response frame mode comprises the following steps: decoding the third target frequency domain signal to obtain third decoding information; determining whether a first bit value in the third decoding information is 1; if the frame is 1, determining that the wireless signal of the current frame is in a high-efficiency single-user frame mode; if not, 1, determining the wireless signal of the current frame as a high-efficiency response frame mode; determining whether the current frame wireless signal is in an efficient extended single-user frame mode or an efficient multi-user frame mode comprises: determining whether the fourth target frequency domain signal is in a quadrature binary phase shift keying modulation mode; if the mode is the quadrature binary phase shift keying modulation mode, determining that the wireless signal of the current frame is a high-efficiency expansion single-user frame mode; if the modulation mode is not the quadrature binary phase shift keying modulation mode, determining that the wireless signal of the current frame is a high-efficiency multi-user frame mode.

Optionally, the target frequency domain signal includes a third target frequency domain signal and a fourth target frequency domain signal; determining whether the current frame wireless signal is in an extended mode or a high throughput mode in a non-efficient mode comprises: if the first transmission rate is not 11, determining that the wireless signal of the current frame is in an extension mode; if the first transmission rate is 11, determining whether the third target frequency domain signal is a binary phase shift keying modulation mode; if the current frame wireless signal is in the binary phase shift keying modulation mode, determining that the current frame wireless signal is in an extension mode; and if the modulation mode is not the binary phase shift keying modulation mode, determining that the wireless signal of the current frame is in a high throughput mode.

Optionally, after determining that the current frame wireless signal is in the high throughput mode, the method further includes: determining whether the group identification in the signaling information of the third target frequency domain signal is 0 or 63; if the group identifier is 0 or 63, determining that the wireless signal of the current frame is in a high-throughput single-user frame mode; if the group identification is not 0 and is not 63, the current frame wireless signal is determined to be in a high throughput multi-user frame mode.

Optionally, determining whether the fourth target frequency domain signal is a quadrature binary phase shift keying modulation mode includes: acquiring real part absolute values of all data subcarriers in the fourth object frequency domain signal, and adding the acquired real part absolute values to obtain a real part sum value; obtaining the imaginary absolute values of all data subcarriers in the fourth target frequency domain signal, and adding the obtained imaginary absolute values to obtain an imaginary sum value; taking the ratio of the real part sum value to the imaginary part sum value as a first ratio and taking the ratio of the imaginary part sum value to the real part sum value as a second ratio; determining whether the first ratio is higher than a second set threshold or the second ratio is higher than the second set threshold; if the first ratio is higher than the second set threshold, determining that the modulation mode is a binary phase shift keying modulation mode; if the second ratio is higher than the second set threshold, determining that the modulation mode is a quadrature binary phase shift keying modulation mode.

Optionally, after determining whether the first ratio is higher than the second set threshold or the second ratio is higher than the second set threshold, the method further includes: if the first ratio and the second ratio are both lower than or equal to a second set threshold, determining a log-likelihood ratio, wherein the log-likelihood ratio comprises a first log-likelihood ratio, a second log-likelihood ratio and a third log-likelihood ratio, the first log-likelihood ratio is a log-likelihood ratio corresponding to the real part of the third target frequency domain signal, the second log-likelihood ratio is a log-likelihood ratio corresponding to the real part of the fourth target frequency domain signal, and the third log-likelihood ratio is a log-likelihood ratio corresponding to the imaginary part of the fourth target frequency domain signal; carrying out conjugate multiplication and addition on subcarriers at corresponding positions in the first log-likelihood ratio and the second log-likelihood ratio to obtain a first real number correlation sum; carrying out conjugate multiplication and addition on subcarriers at corresponding positions in the first log-likelihood ratio and the third log-likelihood ratio to obtain a second real number correlation sum; calculating a difference between the second real number correlation sum and the first real number correlation sum; determining whether the difference is higher than a third set threshold; if the first set threshold is higher than the second set threshold, determining that the modulation mode is a quadrature binary phase shift keying modulation mode; and if the set threshold is lower than or equal to the third set threshold, determining that the binary phase shift keying modulation mode is adopted.

Optionally, determining the log-likelihood ratio includes: respectively carrying out equalization judgment on the third target frequency domain signal and the fourth target frequency domain signal to obtain a third judgment result and a fourth judgment result; multiplying the signal-to-noise ratio factor with the third decision result to obtain a first log-likelihood ratio; and multiplying the signal-to-noise ratio factor with the real part and the imaginary part of the fourth decision result respectively to obtain a second log-likelihood ratio and a third log-likelihood ratio.

Optionally, before determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement, further comprising: decoding the first target frequency domain signal to obtain first decoding information, performing parity check on the first decoding information, and determining whether the first decoding information passes the parity check; if the parity check is passed, determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement; if the parity check is not passed, the current frame wireless signal is determined to be in an efficient mode.

In a second aspect, an embodiment of the present application further provides a signal mode detection apparatus in a multimode receiver, where the apparatus includes:

the target signal acquisition module is used for acquiring a frequency domain signal corresponding to a wireless signal of a current frame, selecting a target frequency domain signal corresponding to a main channel position from the frequency domain signals, wherein the target frequency domain signal comprises a first target frequency domain signal and a second target frequency domain signal, the first target frequency domain signal is a target frequency domain signal corresponding to a first symbol in the wireless signal of the current frame, the second target frequency domain signal is a target frequency domain signal corresponding to a second symbol in the wireless signal of the current frame, and the wireless signal of the current frame is an orthogonal frequency division multiplexing signal;

The similarity requirement judging module is used for determining the correlation value of a first additional data subcarrier set and a second additional data subcarrier set, determining the average power corresponding to the first pilot frequency data subcarrier set and the second pilot frequency data subcarrier set, determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement according to the ratio of the correlation value and the average power, wherein the first additional data subcarrier set is a set formed by data subcarriers in the first target frequency domain signal and the additional subcarriers, the second additional data subcarrier set is a set formed by data subcarriers in the second target frequency domain signal and the additional subcarriers, the additional subcarriers are unique subcarriers in a high-efficiency mode, the first pilot frequency data subcarrier set is a set formed by data subcarriers in the first target frequency domain signal and pilot frequency subcarriers, and the second pilot frequency data subcarrier set is a set formed by data subcarriers in the second target frequency domain signal and pilot frequency subcarriers;

the mode requirement judging module is used for determining whether the second target frequency domain signal meets the preset mode requirement according to the transmission rate and length information if the similarity requirement is met, wherein the preset mode requirement refers to the requirement of the high-efficiency mode on the signaling information;

The first mode determining module is used for determining that the wireless signal of the current frame is a signal in an efficient mode if the preset mode requirement is met;

the second mode determining module is used for determining that the wireless signal of the current frame is a signal in a non-efficient mode if the preset mode requirement is not met;

the sub-mode determining module is used for determining the sub-mode type in the high-efficiency mode according to the length information of the second target frequency domain signal and determining the sub-mode type in the non-high-efficiency mode according to the modulation mode of the second target frequency domain signal.

In a third aspect, embodiments of the present application further provide an electronic device, including: the system comprises a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, the processor and the memory communicate through the bus when the electronic device is running, and the machine-readable instructions when executed by the processor perform the steps of the signal pattern detection method in the multimode receiver.

In a fourth aspect, embodiments of the present application also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a signal pattern detection method in a multimode receiver as described above.

The embodiment of the application brings the following beneficial effects:

according to the signal mode detection method, device, equipment and medium in the multimode receiver, the target frequency domain signal corresponding to the main channel position can be obtained, the mode type of the wireless signal of the current frame is determined according to the similarity between the first target frequency domain signal and the second target frequency domain signal in the target frequency domain signal and the preset mode requirement, and as the correlation value and the average power are calculated according to subcarrier sets of different types, the difference between the different mode signals is reflected by the ratio, the mode types of different signals nearby the sensitivity can be determined more accurately, and compared with the signal mode detection method in the multimode receiver in the prior art, the problem that the detection precision is low when the signal mode detection is carried out nearby the sensitivity is solved.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a flowchart of a signal pattern detection method in a multimode receiver according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a signal mode detection device in a multimode receiver according to an embodiment of the present application;

fig. 3 shows a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, every other embodiment that a person skilled in the art would obtain without making any inventive effort is within the scope of protection of the present application.

Notably, prior to the filing of this application, 802.11 was a wireless local area network protocol. The 802.11 wireless network modes can be classified into 802.11g, 802.11n, 802.11ac and 802.11ax according to specifications, the first two specifications correspond to WiFi4, 802.11ac corresponds to WiFi5, and 802.11ax corresponds to WiFi6. The highest transmission rate supported by WiFi4 is 54Mbps (802.11 g), 600Mbps (802.11 n), the highest transmission rate supported by WiFi5 is 6.9Gbps, and the highest transmission rate supported by WiFi6 is 9.6Gbps. The 802.11 multimode receiver may support 4 types of physical layer protocol data units (Presentation Protocol Data Unit, PPDUs) simultaneously, which are extended Mode (LM), mixed Mode (MM), high throughput Mode (Very High Throughput Mode, VHT), high Efficiency Mode (HE), respectively. The VHT mode can also be split into a high throughput Single User frame mode (Very High Throughput-Single User, VHT-SU) and a high throughput Multi-User frame mode (Very High Throughput-Multi User, VHT-MU). The HE mode can also be split into a High Efficiency Single-User frame mode (HE-SU), a High Efficiency Extended Single-User frame mode (HE-ER-SU), a High Efficiency Multi-User frame mode (HE-MU), a High Efficiency response frame mode (HE-TB). In order to support the above PPDU types simultaneously, mode detection is required during the reception process to distinguish which frame type is specific according to the characteristics of the PPDU, and then signal processing is performed in the next step according to the frame type, so as to obtain MAC frame data carried by the signal. The PPDU mode detection has the following difficulties: when the received OFDM (Orthogonal Frequency Division Multiplexing) signal is near the sensitivity, although the first OFDM symbol and the second OFDM symbol are repeated in the HE mode wireless signal transmitted by the transmitter, after passing through the high noise channel, it cannot be determined at the receiver end whether the two OFDM symbols are repeated, and in addition, for the recognition of the HE-ER-SU mode and the HE-MU mode, the problem that the modulation mode of the fourth frequency domain signal is difficult to recognize under the influence of the high noise channel, that is, with the feature ambiguity, the mode detection at this time needs to design an algorithm to improve the detection accuracy, and only the correct detection result can ensure that the correct data is obtained. However, in the prior art, the accuracy is poor when the mode detection is performed near the sensitivity, resulting in a problem of low signal mode detection accuracy.

Based on this, the embodiment of the application provides a signal mode detection method in a multimode receiver, so as to improve the detection precision when signal mode detection is performed near sensitivity.

Referring to fig. 1, fig. 1 is a flowchart of a signal mode detection method in a multimode receiver according to an embodiment of the present application. As shown in fig. 1, the method for detecting a signal mode in a multimode receiver according to the embodiment of the present application includes:

step S101, obtaining a frequency domain signal corresponding to a wireless signal of a current frame, and selecting a target frequency domain signal corresponding to a main channel position from the frequency domain signals.

In this step, the current frame wireless signal may refer to an orthogonal frequency division multiplexing signal of a single frame, where the orthogonal frequency division multiplexing signal refers to an OFDM signal.

The primary channel may refer to a channel corresponding to a primary channel identifier set in the communication protocol.

For example, the channel of WiFi defaults to 20MHz, in order to increase the transmission speed, 2 channels may be combined together to form a 40MHz channel, one of the channels is used as a main channel, and a main channel identifier is configured in a communication protocol, so that after the multimode receiver receives an OFDM signal, the main channel position is determined according to the main channel identifier configured in the communication protocol.

The target frequency domain signal comprises a first target frequency domain signal and a second target frequency domain signal, wherein the first target frequency domain signal is a target frequency domain signal corresponding to a first symbol in the wireless signal of the current frame, the second target frequency domain signal is a target frequency domain signal corresponding to a second symbol in the wireless signal of the current frame, and the wireless signal of the current frame is an orthogonal frequency division multiplexing signal.

In the embodiment of the application, the signal mode detection method in the multimode receiver can be applied to the multimode receiver, the multimode receiver performs fast fourier transform (Fast Fourier Transform, FFT) on the current frame wireless signal after receiving the current frame wireless signal, converts the current frame wireless time domain signal into a frequency domain signal, and then selects a target frequency domain signal corresponding to the main channel position from the frequency domain signal.

Taking the current frame wireless signal as a 40MHz signal as an example, 128-point FFT is performed on the current frame wireless signal to obtain 128 frequency domain signals, and if the main channel is 0-20 MHz, selecting a frequency domain signal corresponding to 0-20 MHz from the 128 frequency domain signals as a target frequency domain signal. Each signal corresponds to one subcarrier, for a total of 64 subcarriers. The subcarriers from 6 to 31 and from 33 to 58 of the 64 subcarriers are non-null subcarriers, i.e. 52 signals are selected as target frequency domain signals. The 11 # subcarrier, the 25 # subcarrier, the 39 # subcarrier and the 53 # subcarrier in the 6 # subcarrier to the 58 # subcarrier are pilot subcarriers, the 32 # subcarrier is a null subcarrier, and the other 48 # subcarriers are data subcarriers.

In addition, the current frame wireless signal includes a plurality of OFDM symbols, and then the first 4 symbols are selected as target symbols. And performing FFT processing on one OFDM target symbol every 4us time according to the sequence of the OFDM symbols, and sequencing target frequency domain signals corresponding to the first 4 symbols according to the sequence, wherein the 4 OFDM symbols respectively correspond to the first target frequency domain signal, the second target frequency domain signal, the third target frequency domain signal and the fourth target frequency domain signal. The first target frequency domain signal, the second target frequency domain signal, the third target frequency domain signal and the fourth target frequency domain signal are 4 continuous OFDM symbols and are FFT outputs corresponding to a 20MHz main channel.

In an alternative embodiment, before determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement, further comprising: decoding the first target frequency domain signal to obtain first decoding information, performing parity check on the first decoding information, and determining whether the first decoding information passes the parity check; if the parity check is passed, determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement; if the parity check is not passed, the current frame wireless signal is determined to be in an efficient mode.

Specifically, after the first target frequency domain signal is decoded, first decoding information is obtained, the first decoding information comprises signaling information, the signaling information comprises parity check bits, data on the parity check bits are calculated, and whether the parity check is passed or not is determined according to a calculation result. If the parity check is not passed, the first target frequency domain signal is considered to have errors, and the current frame wireless signal is directly judged to be in the HE mode, namely, the current frame wireless signal is judged to be in the high-efficiency mode, because if the first target frequency domain signal has errors in other modes except the HE mode, decoding can not be continued, and the second target frequency domain signal in the HE mode is repetition of the first target frequency domain signal, and decoding can be continued. Therefore, in order to continue decoding, when the parity is not passed, HE mode is determined for subsequent decoding and judgment.

Step S102, determining the correlation value of the first additional data subcarrier set and the second additional data subcarrier set, determining the average power corresponding to the first pilot frequency data subcarrier set and the second pilot frequency data subcarrier set, and determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement according to the ratio of the correlation value and the average power.

In this step, the first target frequency domain signal and the second target frequency domain signal each include different types of subcarriers, and the different types of subcarriers include data subcarriers, pilot subcarriers, and additional subcarriers.

The additional subcarriers are 4 subcarriers added in the HE mode, the rest modes have no additional subcarriers, but the rest modes are processed according to the additional subcarriers during calculation, and the value of the additional subcarriers in the rest modes is 0.

Taking the above example as an example, the number 4 subcarrier, the number 5 subcarrier, the number 59 subcarrier, the number 60 subcarrier, these 4 subcarriers are additional subcarriers in HE mode.

The degree of correlation may refer to a degree of correlation, and the degree of correlation may be represented by a magnitude of a correlation value.

Subcarrier power may refer to a power value corresponding to a subcarrier.

The similarity requirement may refer to a size requirement for the ratio of the absolute value of the correlation value to the average power.

The first set of additional data subcarriers is a set of data subcarriers and additional subcarriers in the first target frequency domain signal, the second set of additional data subcarriers is a set of data subcarriers and additional subcarriers in the second target frequency domain signal, the additional subcarriers are subcarriers unique to the high efficiency mode, the first set of pilot data subcarriers is a set of data subcarriers and pilot subcarriers in the first target frequency domain signal, and the second set of pilot data subcarriers is a set of data subcarriers and pilot subcarriers in the second target frequency domain signal.

In this embodiment of the present application, the data subcarrier, the pilot subcarrier, and the additional subcarrier in the first target frequency domain signal are respectively used as the first data subcarrier, the first pilot subcarrier, and the first additional subcarrier, and the data subcarrier, the pilot subcarrier, and the additional subcarrier in the second target frequency domain signal are respectively used as the second data subcarrier, the second pilot subcarrier, and the second additional subcarrier.

And determining corresponding correlation values of a first additional data subcarrier set and a second additional data subcarrier set, wherein the first additional data subcarrier set is a subcarrier set formed by the first data subcarrier and the first additional subcarrier, and the second additional data subcarrier set is a subcarrier set formed by the second data subcarrier and the second additional subcarrier.

And determining average power corresponding to a first pilot data subcarrier set and a second pilot data subcarrier set, wherein the first pilot data subcarrier set is a subcarrier set formed by a first data subcarrier and a first pilot subcarrier, and the second pilot data subcarrier set is a subcarrier set formed by a second data subcarrier and a second pilot subcarrier.

When the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement, the first target frequency domain signal and the second target frequency domain signal are higher in similarity, and the first target frequency domain signal and the second target frequency domain signal in the HE mode are repeated, so that when the first target frequency domain signal and the second target frequency domain signal are higher in similarity, the wireless signal of the current frame is determined to be the HE mode most likely, but further judgment is needed. Conversely, if the similarity between the first target frequency domain signal and the second target frequency domain signal is low, for example: when the similarity requirement is not met, the wireless signal of the current frame is determined to be in a non-HE mode, namely one of a Legacy mode, a VHT mode and an MM mode.

In an alternative embodiment, determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement according to the ratio of the correlation value to the average power includes: determining whether the ratio of the absolute value of the correlation value to the average power is greater than a first set threshold; if the first set threshold is larger than the second set threshold, determining that the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement.

Specifically, the first target frequency domain signal and the second target frequency domain signal are both represented in the form of a sequence, and the real part and the imaginary part corresponding to each subcarrier are stored in the sequence. The sequence corresponding to the first target frequency domain signal is recorded as:the sequence corresponding to the second target frequency domain signal is noted as: />The first set of additional data subcarriers is denoted as: />The second set of additional data subcarriers is denoted as: />. By the first set of extra data subcarriers +>And a second set of extra data subcarriers +.>And forming an additional data subcarrier set A. The first set of pilot data subcarriers is denoted as: />The second set of pilot data subcarriers is denoted as: />. By the first pilot data subcarrier set +.>And a second pilot data subcarrier set +.>A pilot data subcarrier set B is composed.

And calculating a correlation value for the additional data subcarrier set A, and calculating average power for the pilot frequency data subcarrier set B. Wherein, the correlation value is recorded as: corr_sum, average power is noted as: power_sum. Because the sizes of the data acquired from different data frames are different, the different data frames cannot be compared by using a unified threshold, so that normalization processing is needed for processing conveniently, the ratio of the correlation value to the average power is calculated, and whether the similarity requirement is met is determined according to the comparison result of the ratio and the first set threshold.

When |corrsum|/power sum > thr, it is determined that the first target frequency domain signal and the second target frequency domain signal satisfy the similarity requirement. Wherein thr represents a first set threshold, the value of the first set threshold is a value less than or equal to 1, and a specific value of the first set threshold can be determined by a person skilled in the art according to actual situations, which is not limited herein.

It should be noted that, because the subcarrier set selected when calculating the correlation value is a, the subcarrier set a includes additional subcarriers, and the subcarrier set selected when calculating the average power is B, and the subcarrier set B does not include additional subcarriers, if the current frame wireless signal is in the HE mode, the ratio of the absolute value of the obtained correlation value to the average power is greater than the ratio in the non-HE mode because the HE mode has additional subcarriers, so that it can be determined whether the current frame wireless signal is in the HE mode by the magnitude of the ratio, thereby improving the detection accuracy of the HE mode.

In an alternative embodiment, determining average powers corresponding to the first pilot data subcarrier set and the second pilot data subcarrier set includes: taking the sum of the powers corresponding to all the subcarriers in the first pilot data subcarrier set as first power; taking the sum of the powers corresponding to all the subcarriers in the second pilot data subcarrier set as second power; the average value of the first power and the second power is taken as the average power.

Specifically, the power corresponding to all the subcarriers in the first pilot data subcarrier set and the power corresponding to all the subcarriers in the second pilot data subcarrier set are determined, and then the average value of the two powers is taken as the average power.

The average power can be calculated as follows:

；

in the above formula, i denotes a subcarrier number,for calculating a first power, which is the sum of the powers of all the subcarriers in the first pilot data subcarrier set,/for>And the second power is used for calculating the second power, and the second power is the sum of the powers of all subcarriers in the second pilot data subcarrier set.

In an alternative embodiment, determining the correlation value of the first set of additional data subcarriers with the second set of additional data subcarriers comprises: for each subcarrier in the first additional data subcarrier set, carrying out conjugate correlation processing on the subcarrier and the subcarrier at the corresponding position in the second additional data subcarrier set; the complex values are obtained by adding the results of the conjugate correlation processing, and the complex values are used as correlation values.

Specifically, the correlation values corresponding to the first additional data subcarrier set and the second additional data subcarrier set may be determined according to the following correlation value calculation formula:

；

in the above formula, i denotes a subcarrier number, The complex value is represented by a value of a complex,and is also a correlation value.

Step S103, if the similarity requirement is met, determining whether the second target frequency domain signal meets the preset mode requirement according to the transmission rate and the length information.

In this step, the preset mode requirement refers to the requirement of the efficient mode for signaling information.

Illustratively, the preset mode requirement is a requirement of the efficient mode for transmission rate and length information.

The transmission rate may refer to the rate at which the signal is transmitted, denoted as: rate.

The length information may refer to the byte length of the data portion in the single frame wireless signal, denoted as: length.

In the embodiment of the present application, satisfying the similarity requirement cannot directly determine that the wireless signal of the current frame is in HE mode, but other modes are possible, for example: in order to reduce the false detection rate, further judgment is needed to determine whether the preset mode requirement is met, and when the preset mode requirement is met, the current frame wireless signal can be determined to be in the HE mode, namely the high-efficiency mode.

In an alternative embodiment, determining whether the second target frequency domain signal meets the preset mode requirement according to the transmission rate and the length information includes: after the first target frequency domain signal and the second target frequency domain signal are combined, decoding the combined frequency domain signal to obtain first decoding information, wherein the first decoding information comprises first transmission rate and first length information; determining whether the first transmission rate and the first length information meet a set condition, wherein the set condition is that the transmission rate is equal to 11 and the result of taking the modulus of the length information to 3 is 1 or 2; if the set condition is met, determining that the preset mode requirement is met.

Specifically, the first target frequency domain signal and the second target frequency domain signal are combined and then decoded to obtain 24-bit decoding information, wherein the decoding information comprises signaling information Rate and Length, the Rate is the first transmission Rate, and the Length is the first Length information. According to the specification of the 802.11 communication protocol, if rate=11 and the result of taking the Length to 3 as a module is 1 or 2, it is determined that the preset mode requirement is satisfied. The first target frequency domain signal and the second target frequency domain signal both include Rate information and Length information, but because signal noise may cause the problem of inaccurate decoding information, more accurate Rate and Length can be obtained by decoding the combined signal.

Step S104, if the preset mode requirement is met, determining that the wireless signal of the current frame is a signal in an efficient mode.

In the step, if the first target frequency domain signal and the second target frequency domain signal in the current frame wireless signal meet the similarity requirement, if the preset mode requirement is also met, it is indicated that the first target frequency domain signal and the second target frequency domain signal in the current frame wireless signal are identical and the signaling information in the second target frequency domain signal is identical to the signaling information of the HE mode, so that the current frame wireless signal can be determined to be the HE mode.

Step S105, if the preset mode requirement is not satisfied, determining that the wireless signal of the current frame is a signal of a non-efficient mode.

In this step, if the preset mode requirement is not satisfied, it is indicated that although the similarity between the first target frequency domain signal and the second target frequency domain signal is higher, the signaling information of the second target frequency domain signal is different from the signaling information in the HE mode, and the current frame wireless signal is not the HE mode but another mode other than the HE mode, for example: VHT mode or Legacy mode.

Step S106, determining the sub-mode type in the high-efficiency mode according to the length information of the second target frequency domain signal, and determining the sub-mode type in the non-high-efficiency mode according to the modulation mode of the second target frequency domain signal.

In this step, the modulation scheme may be referred to as binary phase shift keying (Binary Phase Shift Keying, BPSK) and quadrature binary phase shift keying (Orthogonal Binary Phase Shift Keying, OBPSK).

In the embodiment of the present application, after determining whether the current frame radio signal is in the HE mode, it is further required to determine which sub-mode the current frame radio signal belongs to, where the sub-mode refers to a sub-mode in the HE mode or a sub-mode in the non-HE mode.

In an alternative embodiment, determining the sub-mode type in the efficient mode according to the length information of the second target frequency domain signal includes: decoding the second target frequency domain signal to obtain second decoding information, wherein the second decoding information comprises second length information; determining whether the result obtained by taking the modulus of the second length information to 3 is 1; if the result is 1, determining that the wireless signal of the current frame is in a high-efficiency single-user frame mode or a high-efficiency response frame mode; if the result is not 1, determining that the wireless signal of the current frame is an efficient extended single-user frame mode or an efficient multi-user frame mode.

Specifically, the modulo operation is performed on the second length information, where the modulus is 3, and according to the specification of the 802.11 communication protocol, if the operation result is 1, it may be determined that the current frame wireless signal is in HE-SU mode or HE-TB mode. If the operation result is not 1, it may be determined that the current frame wireless signal is in HE-ER-SU mode or HE-MU mode.

In an alternative embodiment, the target frequency domain signal comprises a third target frequency domain signal and a fourth target frequency domain signal; determining whether the current frame wireless signal is in a high-efficiency single-user frame mode or a high-efficiency response frame mode comprises the following steps: decoding the third target frequency domain signal to obtain third decoding information; determining whether a first bit value in the third decoding information is 1; if the frame is 1, determining that the wireless signal of the current frame is in a high-efficiency single-user frame mode; if not, 1, determining the wireless signal of the current frame as a high-efficiency response frame mode; determining whether the current frame wireless signal is in an efficient extended single-user frame mode or an efficient multi-user frame mode comprises: determining whether the fourth target frequency domain signal is in a quadrature binary phase shift keying modulation mode; if the mode is the quadrature binary phase shift keying modulation mode, determining that the wireless signal of the current frame is a high-efficiency expansion single-user frame mode; if the modulation mode is not the quadrature binary phase shift keying modulation mode, determining that the wireless signal of the current frame is a high-efficiency multi-user frame mode.

Specifically, according to the specification in the 802.11 communication protocol, if the value of the first bit in the third decoding information is 1, that is, the value of the 0 th bit is 1, it indicates that the current frame wireless signal is in HE-SU mode, and if the value of the first bit in the third decoding information is not 1, that is, the value of the 0 th bit is not 1, it is determined that the current frame wireless signal is in HE-TB mode.

Since the modulation schemes of the fourth target frequency domain signal of the HE-ER-SU mode and the HE-MU mode are different, a specific sub-mode may be determined according to the modulation scheme in the fourth target frequency domain signal. And if the fourth target frequency domain signal is not the OBPSK modulation mode, determining that the current frame wireless signal is in the HE-ER-SU mode.

In an alternative embodiment, determining whether the fourth target frequency domain signal is quadrature binary phase shift keying modulated comprises: acquiring real part absolute values of all data subcarriers in the fourth object frequency domain signal, and adding the acquired real part absolute values to obtain a real part sum value; obtaining the imaginary absolute values of all data subcarriers in the fourth target frequency domain signal, and adding the obtained imaginary absolute values to obtain an imaginary sum value; taking the ratio of the real part sum value to the imaginary part sum value as a first ratio and taking the ratio of the imaginary part sum value to the real part sum value as a second ratio; determining whether the first ratio is higher than a second set threshold or the second ratio is higher than the second set threshold; if the first ratio is higher than the second set threshold, determining that the modulation mode is a binary phase shift keying modulation mode; if the second ratio is higher than the second set threshold, determining that the modulation mode is a quadrature binary phase shift keying modulation mode.

Specifically, the real part sum value and the imaginary part sum value are obtained from the signal from which the phase information is removed, the ratio of the real part sum value to the imaginary part sum value is used as a first ratio, the ratio of the imaginary part sum value to the real part sum value is used as a second ratio, and if the first ratio is higher than a second set threshold or the second ratio is higher than the second set threshold, the judgment result of the modulation mode at the moment is determined to be credible. Because, in the signal transmitted by the transmitter from which the phase information is removed, the value of the real part is much larger than the value of the imaginary part in the case of BPSK modulation, and the value of the imaginary part is much larger than the value of the real part in the case of OBPSK modulation, in the received wireless signal, if the ratio of the real part to the imaginary part is greater than the second set threshold or the ratio of the imaginary part to the real part is greater than the second set threshold, it can be determined to be trusted.

After the judgment result of the modulation mode is determined to be credible, the modulation mode can be determined according to the first ratio or the second ratio without further judgment, and if the first ratio is lower than or equal to the second set threshold and the second ratio is also lower than or equal to the second set threshold, the judgment result of the modulation mode is not credible and further judgment by using the log likelihood ratio is needed.

Therefore, when the first ratio is higher than the second set threshold, or the second ratio is higher than the second set threshold, if the first ratio is higher than the second set threshold, the modulation mode is determined to be the BPSK modulation mode, and if the second ratio is higher than the second set threshold, the modulation mode is determined to be the OBPSK modulation mode. The second threshold may be set to 1.25 or 1.2, and the second threshold is a value greater than 1.

In an alternative embodiment, after determining whether the first ratio is above the second set threshold or the second ratio is above the second set threshold, the method further comprises: if the first ratio and the second ratio are both lower than or equal to a second set threshold, determining a log-likelihood ratio, wherein the log-likelihood ratio comprises a first log-likelihood ratio, a second log-likelihood ratio and a third log-likelihood ratio, the first log-likelihood ratio is a log-likelihood ratio corresponding to the real part of the third target frequency domain signal, the second log-likelihood ratio is a log-likelihood ratio corresponding to the real part of the fourth target frequency domain signal, and the third log-likelihood ratio is a log-likelihood ratio corresponding to the imaginary part of the fourth target frequency domain signal; carrying out conjugate multiplication and addition on subcarriers at corresponding positions in the first log-likelihood ratio and the second log-likelihood ratio to obtain a first real number correlation sum; carrying out conjugate multiplication and addition on subcarriers at corresponding positions in the first log-likelihood ratio and the third log-likelihood ratio to obtain a second real number correlation sum; calculating a difference between the second real number correlation sum and the first real number correlation sum; determining whether the difference is higher than a third set threshold; if the first set threshold is higher than the second set threshold, determining that the modulation mode is a quadrature binary phase shift keying modulation mode; and if the set threshold is lower than or equal to the third set threshold, determining that the binary phase shift keying modulation mode is adopted.

Specifically, when the modulation scheme is further determined by using the log-likelihood ratio, it is first necessary to determine the value of the log-likelihood ratio. The log-likelihood ratios include three log-likelihood ratios, a first log-likelihood ratio, a second log-likelihood ratio, and a third log-likelihood ratio, respectively. After determining the three log-likelihood ratios, the first log-likelihood ratio needs to be deinterleaved, but the second log-likelihood ratio and the third log-likelihood ratio do not need to be deinterleaved, because in the current frame wireless signal received by the multimode receiver, the third target frequency domain signal and the fourth target frequency domain signal are encoded by the same bit sequence, the third target frequency domain signal is interleaved, and the fourth target frequency domain signal is not interleaved, if the HE-ER-SU mode is adopted, the third target frequency domain signal is obtained after BPSK modulation, the fourth target frequency domain signal is obtained by an OBPSK modulation mode, and the fourth target frequency domain signal is obtained by a BPSK modulation mode in other modes. It is necessary to deinterleave the first log-likelihood ratio corresponding to the third target frequency domain signal without deinterleaving the second and third log-likelihood ratios corresponding to the fourth target frequency domain signal.

If the difference value is higher than the third set threshold, determining that the fourth target frequency domain signal is OBPSK, the current frame wireless signal is in HE-ER-SU mode, if not, determining that the fourth target frequency domain signal is in BPSK, and the current frame wireless signal is in HE-MU mode. The specific value of the third set threshold can be determined according to the result of the log-likelihood ratio, and the larger the value of the log-likelihood ratio is, the higher the value of the third set threshold is, and the smaller the value of the log-likelihood ratio is, the lower the third set threshold is.

In an alternative embodiment, determining the log-likelihood ratio includes: respectively carrying out equalization judgment on the third target frequency domain signal and the fourth target frequency domain signal to obtain a third judgment result and a fourth judgment result; and multiplying the signal-to-noise ratio factor with the third decision result to obtain a first log-likelihood ratio. And multiplying the signal-to-noise ratio factor with the real part and the imaginary part of the fourth decision result respectively to obtain a second log-likelihood ratio and a third log-likelihood ratio.

Specifically, the log likelihood ratio can be calculated using the following formula:

；

in the above equation, LLR represents log-likelihood ratio, SNR represents signal-to-noise factor,and (3) representing an equalization judgment result, namely a third judgment result corresponding to the third target frequency domain signal or a fourth judgment result corresponding to the third target frequency domain signal. Wherein (1)>The value of (2) is 1 or-1, and a person skilled in the art can select a signal-to-noise ratio estimation algorithm according to the actual situation to determine the value of the signal-to-noise ratio factor, which is not limited herein. In addition, since the equalization decision belongs to the prior art, the details are not repeated here.

In an alternative embodiment, determining the sub-mode type in the non-efficient mode according to the modulation mode of the second target frequency domain signal includes: determining whether a modulation mode of the second target frequency domain signal is quadrature binary phase shift keying and whether a first transmission rate corresponding to the first target frequency domain signal is 11; if the modulation mode is determined to be quadrature binary phase shift keying and the first transmission rate is equal to 11, determining that the wireless signal of the current frame is a mixed mode in a non-efficient mode; if the modulation mode is determined not to be quadrature binary phase shift keying or the first transmission rate is determined not to be equal to 11, determining that the wireless signal of the current frame is in an extension mode or a high throughput mode under the non-efficient mode.

Specifically, if the modulation mode of the second target frequency domain signal is OBPSK and the rate=11 corresponding to the first target frequency domain signal, determining that the current frame wireless signal is in MM mode, otherwise determining that the current frame wireless signal is in Legacy mode or VHT mode.

In an alternative embodiment, the target frequency domain signal comprises a third target frequency domain signal and a fourth target frequency domain signal; determining whether the current frame wireless signal is in an extended mode or a high throughput mode in a non-efficient mode comprises: if the first transmission rate is not 11, determining that the wireless signal of the current frame is in an extension mode; if the first transmission rate is not 11, determining whether the third target frequency domain signal is a binary phase shift keying modulation mode; if the current frame wireless signal is in the binary phase shift keying modulation mode, determining that the current frame wireless signal is in an extension mode; and if the modulation mode is not the binary phase shift keying modulation mode, determining that the wireless signal of the current frame is in a high throughput mode.

Specifically, according to the specification of the 802.11 communication protocol, when the Rate corresponding to the first target frequency domain signal is not equal to 11, or the Rate corresponding to the first target frequency domain signal is equal to 11 and the modulation mode of the third target frequency domain signal is BPSK, determining that the wireless signal of the current frame is in Legacy mode.

And when the Rate corresponding to the first target frequency domain signal is equal to 11 and the modulation mode of the third target frequency domain signal is OBPSK, determining that the wireless signal of the current frame is in a VHT mode.

In an alternative embodiment, after determining that the current frame wireless signal is in the high throughput mode, the method further comprises: determining whether the group identification in the signaling information of the third target frequency domain signal is 0 or 63; if the group identifier is 0 or 63, determining that the wireless signal of the current frame is in a high-throughput single-user frame mode; if the group identification is not 0 and is not 63, the current frame wireless signal is determined to be in a high throughput multi-user frame mode.

Specifically, if it is determined that the current frame wireless signal is in VHT mode, signaling decoding is performed on the third target frequency domain signal, a value of group_id, that is, a value of group identifier, is obtained in decoding information, and according to specifications of the 802.11 communication protocol, if the group_id is 0 or 63, it is determined that the current frame wireless signal is in VHT-SU mode, and if the group_id is not 0 or 63, it is determined that the current frame wireless signal is in VHT-MU mode.

Compared with a signal mode detection method in a multimode receiver in the prior art, the method and the device can acquire the target frequency domain signal corresponding to the main channel position, and determine the mode type of the wireless signal of the current frame according to the similarity between the first target frequency domain signal and the second target frequency domain signal in the target frequency domain signal and the preset mode requirement.

Based on the same inventive concept, the embodiment of the present application further provides a signal mode detection device in a multimode receiver corresponding to the signal mode detection method in the multimode receiver, and since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the signal mode detection method in the multimode receiver in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repetition is omitted.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a signal mode detecting device in a multimode receiver according to an embodiment of the present application. As shown in fig. 2, the signal pattern detection apparatus 200 in the multimode receiver includes:

the target signal obtaining module 201 is configured to obtain a frequency domain signal corresponding to a current frame of wireless signals, select a target frequency domain signal corresponding to a main channel position from the frequency domain signals, where the target frequency domain signal includes a first target frequency domain signal and a second target frequency domain signal, the first target frequency domain signal is a target frequency domain signal corresponding to a first symbol in the current frame of wireless signals, the second target frequency domain signal is a target frequency domain signal corresponding to a second symbol in the current frame of wireless signals, and the current frame of wireless signals is an orthogonal frequency division multiplexing signal;

The similarity requirement judging module 202 is configured to determine a correlation value between a first additional data subcarrier set and a second additional data subcarrier set, determine average powers corresponding to the first pilot data subcarrier set and the second pilot data subcarrier set, determine whether the first target frequency domain signal and the second target frequency domain signal meet a similarity requirement according to a ratio of the correlation value to the average powers, where the first additional data subcarrier set is a set formed by a data subcarrier and an additional subcarrier in the first target frequency domain signal, the second additional data subcarrier set is a set formed by a data subcarrier and an additional subcarrier in the second target frequency domain signal, the additional subcarrier is a unique subcarrier in a high-efficiency mode, the first pilot data subcarrier set is a set formed by a data subcarrier and a pilot subcarrier in the first target frequency domain signal, and the second pilot data subcarrier set is a set formed by a data subcarrier and a pilot subcarrier in the second target frequency domain signal;

a mode requirement judging module 203, configured to determine whether the second target frequency domain signal meets a preset mode requirement according to the transmission rate and the length information if the similarity requirement is met, where the preset mode requirement refers to a requirement of the efficient mode on the signaling information;

A first mode determining module 204, configured to determine that the wireless signal of the current frame is a signal in an efficient mode if a preset mode requirement is met;

a second mode determining module 205, configured to determine that the current frame wireless signal is a signal in a non-efficient mode if the preset mode requirement is not satisfied;

the sub-mode determining module 206 is configured to determine a sub-mode type in the efficient mode according to the length information of the second target frequency domain signal, and determine a sub-mode type in the non-efficient mode according to the modulation mode of the second target frequency domain signal.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 3, the electronic device 300 includes a processor 310, a memory 320, and a bus 330.

The memory 320 stores machine-readable instructions executable by the processor 310, and when the electronic device 300 is running, the processor 310 communicates with the memory 320 through the bus 330, and when the machine-readable instructions are executed by the processor 310, the steps of the signal pattern detection method in the multimode receiver in the method embodiment shown in fig. 1 can be executed, and detailed implementation is referred to in the method embodiment and will not be repeated herein.

The embodiment of the present application further provides a computer readable storage medium, where a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the signal mode detection method in the multimode receiver in the method embodiment shown in fig. 1 may be executed, and a specific implementation manner may refer to the method embodiment and will not be described herein.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for detecting a signal pattern in a multimode receiver, comprising:

acquiring a frequency domain signal corresponding to a current frame wireless signal, and selecting a target frequency domain signal corresponding to a main channel position from the frequency domain signals, wherein the target frequency domain signal comprises a first target frequency domain signal and a second target frequency domain signal, the first target frequency domain signal is a target frequency domain signal corresponding to a first symbol in the current frame wireless signal, the second target frequency domain signal is a target frequency domain signal corresponding to a second symbol in the current frame wireless signal, and the current frame wireless signal is an orthogonal frequency division multiplexing signal;

Determining a correlation value of a first additional data subcarrier set and a second additional data subcarrier set, determining average powers corresponding to a first pilot frequency data subcarrier set and a second pilot frequency data subcarrier set, determining whether the first target frequency domain signal and the second target frequency domain signal meet a similarity requirement according to a ratio of the correlation value to the average powers, wherein the first additional data subcarrier set is a set formed by data subcarriers and additional subcarriers in the first target frequency domain signal, the second additional data subcarrier set is a set formed by data subcarriers and additional subcarriers in the second target frequency domain signal, the additional subcarriers are unique subcarriers in an efficient mode, the first pilot frequency data subcarrier set is a set formed by data subcarriers and pilot frequency subcarriers in the first target frequency domain signal, and the second pilot frequency data subcarrier set is a set formed by data subcarriers and pilot frequency subcarriers in the second target frequency domain signal;

if the similarity requirement is met, determining whether the second target frequency domain signal meets a preset mode requirement according to the transmission rate and length information, wherein the preset mode requirement refers to the requirement of an efficient mode on signaling information;

if the current frame wireless signal does not meet the preset mode requirement, determining that the current frame wireless signal is a signal in a non-efficient mode;

determining a sub-mode type in an efficient mode according to the length information of the second target frequency domain signal, and determining a sub-mode type in a non-efficient mode according to the modulation mode of the second target frequency domain signal;

the determining whether the first target frequency domain signal and the second target frequency domain signal meet a similarity requirement according to the ratio of the correlation value to the average power includes:

determining whether a ratio of the absolute value of the correlation value to the average power is greater than a first set threshold;

if the first target frequency domain signal is larger than a first set threshold, determining that the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement;

the determining the average power corresponding to the first pilot data subcarrier set and the second pilot data subcarrier set includes:

taking the sum of the powers corresponding to all subcarriers in the first pilot data subcarrier set as a first power;

taking the sum of the powers corresponding to all subcarriers in the second pilot data subcarrier set as second power;

Taking the average value of the first power and the second power as average power;

the determining the correlation value of the first additional data subcarrier set and the second additional data subcarrier set includes:

for each subcarrier in the first additional data subcarrier set, performing conjugate correlation processing on the subcarrier and the subcarrier in the corresponding position in the second additional data subcarrier set;

adding the results of the conjugate correlation processing to obtain complex values, and taking the complex values as correlation values;

the determining whether the second target frequency domain signal meets the preset mode requirement according to the transmission rate and the length information includes:

after the first target frequency domain signal and the second target frequency domain signal are combined, decoding the combined frequency domain signal to obtain first decoding information, wherein the first decoding information comprises first transmission rate and first length information;

determining whether the first transmission rate and the first length information meet a set condition, wherein the set condition is that the transmission rate is equal to 11 and the result of modulo 3 of the length information is 1 or 2;

if the set condition is met, determining that the preset mode requirement is met.

2. The method of claim 1, wherein determining the sub-mode type in the efficient mode based on the length information of the second target frequency domain signal comprises:

Decoding the second target frequency domain signal to obtain second decoding information, wherein the second decoding information comprises second length information;

determining whether the result obtained by taking the modulus of 3 from the second length information is 1;

if the result is 1, determining that the current frame wireless signal is in a high-efficiency single-user frame mode or a high-efficiency response frame mode;

if the result is not 1, determining that the current frame wireless signal is in an efficient extended single-user frame mode or an efficient multi-user frame mode.

3. The method of claim 1, wherein determining the sub-mode type in the non-efficient mode according to the modulation scheme of the second target frequency domain signal comprises:

determining whether a modulation mode of the second target frequency domain signal is quadrature binary phase shift keying and whether a first transmission rate corresponding to the first target frequency domain signal is 11;

if the modulation mode is determined to be quadrature binary phase shift keying and the first transmission rate is equal to 11, determining that the wireless signal of the current frame is a mixed mode under a non-efficient mode;

and if the modulation mode is determined not to be quadrature binary phase shift keying or the first transmission rate is determined not to be equal to 11, determining that the wireless signal of the current frame is in an extension mode or a high throughput mode under an inefficient mode.

4. The method of claim 2, wherein the target frequency domain signal comprises a third target frequency domain signal and a fourth target frequency domain signal;

the determining that the current frame wireless signal is in a high-efficiency single-user frame mode or a high-efficiency response frame mode comprises:

decoding the third target frequency domain signal to obtain third decoding information;

determining whether a first bit value in the third decoding information is 1;

if the current frame wireless signal is 1, determining that the current frame wireless signal is in a high-efficiency single-user frame mode;

if not, 1, determining the wireless signal of the current frame as an efficient response frame mode;

the determining that the current frame wireless signal is in an efficient extended single-user frame mode or an efficient multi-user frame mode includes:

determining whether the fourth target frequency domain signal is a quadrature binary phase shift keying modulation mode;

if the current frame wireless signal is in the quadrature binary phase shift keying modulation mode, determining that the current frame wireless signal is in a high-efficiency expansion single-user frame mode;

and if the current frame wireless signal is not the quadrature binary phase shift keying modulation mode, determining that the current frame wireless signal is in a high-efficiency multi-user frame mode.

5. The method of claim 3, wherein the target frequency domain signal comprises a third target frequency domain signal and a fourth target frequency domain signal;

The determining that the current frame wireless signal is in an extended mode or a high throughput mode in a non-efficient mode includes:

if the first transmission rate is not 11, determining that the wireless signal of the current frame is in an extension mode;

if the first transmission rate is 11, determining whether the third target frequency domain signal is a binary phase shift keying modulation mode;

if the current frame wireless signal is in the binary phase shift keying modulation mode, determining that the current frame wireless signal is in an extension mode;

and if the current frame wireless signal is not in the binary phase shift keying modulation mode, determining that the current frame wireless signal is in a high throughput mode.

6. The method of claim 5, further comprising, after said determining that said current frame wireless signal is in a high throughput mode:

determining whether a group identification in signaling information of the third target frequency domain signal is 0 or 63;

if the group identifier is 0 or 63, determining that the current frame wireless signal is in a high-throughput single-user frame mode;

if the group identifier is not 0 and is not 63, determining that the current frame wireless signal is in a high throughput multi-user frame mode.

7. The method of claim 4, wherein determining whether the fourth target frequency domain signal is quadrature binary phase shift keying modulated comprises:

Acquiring real part absolute values of all data subcarriers in the fourth target frequency domain signal, and adding the acquired real part absolute values to obtain a real part sum value;

acquiring the absolute values of the imaginary parts of all data subcarriers in the fourth target frequency domain signal, and adding the acquired absolute values of the imaginary parts to obtain an imaginary part sum value;

taking the ratio of the real part sum value to the imaginary part sum value as a first ratio and taking the ratio of the imaginary part sum value to the real part sum value as a second ratio;

determining whether the first ratio is higher than a second set threshold or the second ratio is higher than the second set threshold;

if the first ratio is higher than a second set threshold, determining that the modulation mode is a binary phase shift keying modulation mode;

and if the second ratio is higher than a second set threshold, determining that the modulation mode is a quadrature binary phase shift keying modulation mode.

8. The method of claim 7, further comprising, after said determining whether said first ratio is above a second set threshold or said second ratio is above a second set threshold:

if the first ratio and the second ratio are both lower than or equal to a second set threshold, determining a log-likelihood ratio, wherein the log-likelihood ratio comprises a first log-likelihood ratio, a second log-likelihood ratio and a third log-likelihood ratio, the first log-likelihood ratio is a log-likelihood ratio corresponding to a real part of the third target frequency-domain signal, the second log-likelihood ratio is a log-likelihood ratio corresponding to a real part of the fourth target frequency-domain signal, and the third log-likelihood ratio is a log-likelihood ratio corresponding to an imaginary part of the fourth target frequency-domain signal;

Carrying out conjugate multiplication and addition on subcarriers at corresponding positions in the first log-likelihood ratio and the second log-likelihood ratio to obtain a first real number correlation sum;

carrying out conjugate multiplication and addition on subcarriers at corresponding positions in the first log-likelihood ratio and the third log-likelihood ratio to obtain a second real number correlation sum;

calculating a difference of the second real correlation sum and the first real correlation sum;

determining whether the difference is above a third set threshold;

if the first set threshold is higher than the second set threshold, determining that the modulation mode is a quadrature binary phase shift keying modulation mode;

and if the set threshold is lower than or equal to the third set threshold, determining that the binary phase shift keying modulation mode is adopted.

9. The method of claim 8, wherein the determining a log likelihood ratio comprises:

respectively carrying out equalization judgment on the third target frequency domain signal and the fourth target frequency domain signal to obtain a third judgment result and a fourth judgment result;

multiplying the signal-to-noise ratio factor with the third decision result to obtain a first log-likelihood ratio;

and multiplying the signal-to-noise ratio factor with the real part and the imaginary part of the fourth decision result respectively to obtain a second log-likelihood ratio and a third log-likelihood ratio.

10. The method of claim 1, further comprising, prior to said determining whether the first target frequency domain signal and the second target frequency domain signal meet a similarity requirement:

decoding the first target frequency domain signal to obtain first decoding information, performing parity check on the first decoding information, and determining whether the first decoding information passes the parity check;

if the parity check is passed, determining whether the first target frequency domain signal and the second target frequency domain signal meet a similarity requirement;

and if the parity check is not passed, determining that the wireless signal of the current frame is in an efficient mode.

11. A signal pattern detection apparatus in a multimode receiver, comprising:

The similarity requirement judging module is used for determining a correlation value of a first additional data subcarrier set and a second additional data subcarrier set, determining average power corresponding to a first pilot frequency data subcarrier set and a second pilot frequency data subcarrier set, determining whether the first target frequency domain signal and the second target frequency domain signal meet the similarity requirement according to the ratio of the correlation value to the average power, wherein the first additional data subcarrier set is a set formed by data subcarriers in the first target frequency domain signal and additional subcarriers, the second additional data subcarrier set is a set formed by data subcarriers in the second target frequency domain signal and additional subcarriers, the additional subcarriers are unique subcarriers in an efficient mode, and the first pilot frequency data subcarrier set is a set formed by data subcarriers in the first target frequency domain signal and pilot frequency subcarriers, and the second pilot frequency data subcarrier set is a set formed by data subcarriers in the second target frequency domain signal and pilot frequency subcarriers;

the sub-mode determining module is used for determining the sub-mode type in the high-efficiency mode according to the length information of the second target frequency domain signal and determining the sub-mode type in the non-high-efficiency mode according to the modulation mode of the second target frequency domain signal;

the similarity requirement judging module is specifically configured to:

the similarity requirement judging module is further specifically configured to:

the mode requirement judging module is specifically configured to:

12. An electronic device, comprising: a processor, a storage medium and a bus, the storage medium storing machine-readable instructions executable by the processor, the processor and the storage medium communicating over the bus when the electronic device is running, the processor executing the machine-readable instructions to perform the steps of the signal pattern detection method in a multimode receiver as claimed in any one of claims 1 to 10.

13. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the signal pattern detection method in a multimode receiver according to any one of claims 1 to 10.