WO2017004836A1 - 一种数据检测方法和装置 - Google Patents

一种数据检测方法和装置 Download PDF

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Publication number
WO2017004836A1
WO2017004836A1 PCT/CN2015/083694 CN2015083694W WO2017004836A1 WO 2017004836 A1 WO2017004836 A1 WO 2017004836A1 CN 2015083694 W CN2015083694 W CN 2015083694W WO 2017004836 A1 WO2017004836 A1 WO 2017004836A1
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sig
data
ppdu
sequence
signal
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PCT/CN2015/083694
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English (en)
French (fr)
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刘云
刘晟
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华为技术有限公司
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Priority to PCT/CN2015/083694 priority Critical patent/WO2017004836A1/zh
Priority to CN201580081297.1A priority patent/CN107735995B/zh
Publication of WO2017004836A1 publication Critical patent/WO2017004836A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols

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  • the present invention belongs to the field of communication technologies, and in particular, to a data detection method and apparatus.
  • the existing wireless local area network (English: Wireless Local Access Network, WLAN) standard based on OFDM (English: Orthogonal Frequency-Division Multiplexing) technology is gradually evolved by 802.11a, 802.11n, 802.11.
  • the ac and other versions are composed.
  • the IEEE (English: Institute of Electrical and Electronic Engineers) 802.11 standard organization has launched a new generation WLAN standard called HEW (High Efficiency WLAN).
  • a data detection method and apparatus are provided herein that can efficiently distinguish between 802.11ax packets, periodic signals, and legacy WLAN packets.
  • an embodiment of the present invention provides a data detection method, which is applied to a wireless local area network (WLAN), and includes:
  • the information carried by the PPDU is determined according to the result of the multiplication.
  • the determining, by the multiplied result, information carried by the PPDU including: dividing the multiplied result into two Groups, each group includes data subcarriers that are discontinuous in the frequency domain, determine first bit information according to the result of the first group, and determine second bit information according to the result of the second group.
  • the signal of the data subcarrier in the traditional signaling field L-SIG in the PPDU and the first one after the L-SIG Multiplying signals of corresponding position data subcarriers in orthogonal frequency division multiplexing OFDM symbols including:
  • the determining, according to the result of the multiplication, the information carried by the PPDU comprising: determining first bit information according to a result of the first group multiplication, and determining second bit information according to a result of the second group multiplication.
  • the first bit carried by the PPDU The information and the second bit information are used to indicate a protocol version to which the PPDU belongs.
  • an embodiment of the present invention provides a data detection method, which is applied to a wireless local area network (WLAN), and includes:
  • the data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU is The signal is multiplied by a sequence of features, including:
  • the signal of the data subcarrier in the first OFDM symbol after the L-SIG is multiplied by the signature sequence.
  • the feature sequence is two
  • the first orthogonal frequency division after the traditional signaling field L-SIG in the PPDU is The signal of the data subcarriers in the multiplexed OFDM symbol is multiplied by two signature sequences, including:
  • the multiplying the signal and the L-SIG are cross-correlated, including:
  • the first scrambling sequence and the second scrambling sequence are respectively subjected to cross-correlation processing with the L-SIG.
  • the determining, according to the result of the cross-correlation processing, information carried by the PPDU includes: according to the first The result of the cross-correlation processing performed by the scrambling sequence and the L-SIG determines the first bit information, and the second bit information is determined according to the result of the cross-correlation processing performed by the second scrambling sequence and the L-SIG.
  • the feature sequence is a sequence consisting of +1 and -1
  • the feature sequence includes a bit subsequence or multiple bits a subsequence comprising: [+1 +1 +1 +1], [+1 +1-1 -1], [+1 -1 +1], [+1 -1 +1] -1], [-1 -1 -1], [-1 -1 +1 +1], [-1 +1 +1-1] or [-1 +1 -1 +1].
  • the number of data subcarriers in the feature sequence is the same as the number of data subcarriers in the L-SIG, and the data subclass in the feature sequence
  • the number of carriers is the same as the number of data subcarriers in the first OFDM symbol after the L-SIG.
  • an embodiment of the present invention provides a data detecting apparatus, which is applied to a wireless local area network (WLAN), and includes:
  • a transceiver unit configured to receive a physical layer protocol data unit PPDU;
  • a processing unit configured to: use a signal of a data subcarrier in a traditional signaling field L-SIG in the PPDU and a signal of a corresponding position data subcarrier in a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG Multiply
  • the processing unit is further configured to determine information carried by the PPDU according to the result of the multiplication.
  • the processing unit determines information carried by the PPDU, including: dividing the multiplied result into two groups, Each group includes data subcarriers that are discontinuous in the frequency domain, according to the junction of the first group If the first bit information is determined, the second bit information is determined based on the result of the second group.
  • the processing unit the signal of the data subcarrier in the traditional signaling field L-SIG in the PPDU and the first after the L-SIG Multiplying signals of corresponding position data subcarriers in an orthogonal frequency division multiplexing OFDM symbol, including:
  • the determining, according to the result of the multiplication, the information carried by the PPDU comprising: determining first bit information according to a result of the first group multiplication, and determining second bit information according to a result of the second group multiplication.
  • the first bit carried by the PPDU The information and the second bit information are used to indicate a protocol version to which the PPDU belongs.
  • an embodiment of the present invention provides a data detecting apparatus, which is applied to a wireless local area network (WLAN), and includes:
  • a transceiver unit configured to receive a physical layer protocol data unit PPDU;
  • a processing unit configured to multiply a signal of a data subcarrier in a first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU by one or more feature sequences;
  • the processing unit is further configured to perform cross-correlation processing on the multiplied signal and the L-SIG;
  • the processing unit is further configured to determine, according to a result of the cross-correlation processing, information carried by the PPDU.
  • the processing unit the data in the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU
  • the subcarrier signal is multiplied by a signature sequence, including:
  • the feature sequence is two, and the processing unit uses the first orthogonal after the traditional signaling field L-SIG in the PPDU
  • the signal of the data subcarrier in the frequency division multiplexed OFDM symbol is multiplied by two signature sequences, including:
  • the multiplying the signal and the L-SIG are cross-correlated, including:
  • the first scrambling sequence and the second scrambling sequence are respectively subjected to cross-correlation processing with the L-SIG.
  • the processing unit according to the result of the cross-correlation processing, determining information carried by the PPDU, The first scrambling sequence and the L-SIG perform cross-correlation processing to determine the first bit information, and determine the second bit information according to the result of the cross-correlation processing performed by the second scrambling sequence and the L-SIG.
  • the feature sequence is a sequence consisting of +1 and -1
  • the feature sequence includes a bit subsequence or a plurality of bits a subsequence comprising: [+1 +1 +1 +1], [+1 +1-1 -1], [+1 -1 +1], [+1 -1 +1] -1], [-1 -1 -1], [-1 -1 +1 +1], [-1 +1 +1-1] or [-1 +1 -1 +1].
  • the number of data subcarriers in the feature sequence is the same as the number of data subcarriers in the L-SIG, and the data subclass in the feature sequence
  • the number of carriers is the same as the number of data subcarriers in the first OFDM symbol after the L-SIG.
  • the signal of the data subcarrier in the traditional signaling field L-SIG in the PPDU and the first OFDM symbol after the L-SIG are used in the data detection process of the WLAN.
  • the signal of the corresponding position data subcarrier is multiplied, and the information carried by the PPDU is determined according to the result of the multiplication. According to the above manner, the 11ax physical layer packet can be efficiently distinguished, and the misjudgment caused by the periodic signal is avoided.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • Figure 3 is a constellation diagram of BPSK and QBPSK modulation.
  • Figure 4 is a possible physical layer grouping structure diagram of 802.11ax.
  • Figure 5 shows the generation process of the scrambled RL-SIG field.
  • FIG. 6 is a flowchart of a method according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic block diagram of Embodiment 1 of the present invention.
  • FIG. 8 is a flowchart of a method according to Embodiment 2 of the present invention.
  • FIG. 9 is a schematic block diagram of Method 1 of Embodiment 2 of the present invention.
  • FIG. 10 is a schematic block diagram of a method 2 of Embodiment 2 of the present invention.
  • FIG. 11 is a logical structural diagram of a receiving station according to Embodiment 3 of the present invention.
  • FIG. 12 is a logical structural diagram of a receiving station according to Embodiment 4 of the present invention.
  • Figure 13 is a diagram showing the physical structure of a station in Embodiment 5 of the present invention.
  • the embodiments of the present invention can be applied to a WLAN.
  • the standard adopted by the WLAN is the IEEE 802.11 series.
  • the WLAN may include multiple basic service sets (English: Basic Service Set, BSS for short).
  • the network nodes in the basic service set are stations (English: Station, abbreviated as STA).
  • the site includes the access point class (abbreviation: AP). , English: Access Point) and non-access point class sites (English: None Access Point Station, referred to as: Non-AP STA).
  • Each basic service set may contain one AP and multiple Non-AP STAs associated with the AP.
  • Access point class sites also known as wireless access points or hotspots.
  • An AP is an access point for mobile users to enter a wired network. It is mainly deployed in the home, inside the building, and inside the campus. The type covers a radius of several tens of meters to hundreds of meters, and of course, it can also be deployed outdoors.
  • An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet.
  • the AP may be a terminal device or a network device with a WiFi (English: Wireless Fidelity) chip.
  • the AP may be a device supporting the 802.11ax system. Further, the AP may be a device supporting multiple WLAN technologies such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Non-AP STA A non-access point class (English: None Access Point Station, referred to as Non-AP STA), which can be a wireless communication chip, a wireless sensor, or a wireless communication terminal.
  • Non-AP STA mobile phone supporting WiFi communication function
  • tablet computer supporting WiFi communication function set-top box supporting WiFi communication function
  • smart TV supporting WiFi communication function smart wearable device supporting WiFi communication function
  • vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication.
  • the site can support the 802.11ax system. Further optionally, the site supports multiple WLAN formats such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • Figure 1 is a system diagram of a typical WLAN deployment scenario, including an AP and three STAs, and the AP communicates with STA1, STA2, and STA3, respectively.
  • FIG. 2 shows the physical layer packet structure of 802.11a, 802.11n, and 802.11ac, where the first part of them is the legacy preamble, that is, A field consisting of a Legacy Short Training Field (L-STF), a Legacy Long Training Field (L-LTF), and a Legacy Signal Field (L-SIG).
  • L-STF Legacy Short Training Field
  • L-LTF Legacy Long Training Field
  • L-SIG Legacy Signal Field
  • the protocol-specific preamble of the 802.11n physical layer packet is composed of a High Throughput Signal Field (HT-SIG), a High Throughput Short Training Field (HT-STF), and a High High Throughput Long Training Field (HT-LTF);
  • the protocol-specific preamble of the 802.11ac physical layer packet is composed of Very High Throughput Signal-A field (VHT-SIG).
  • VHT-SIG Very High Throughput Signal-A field
  • VHT-STF Very High Throughput Short Training Field
  • VHT-LTF Very High Throughput Long Training Field
  • VHT-SIG-B Very High Throughput Signal-B field
  • each OFDM symbol includes a Cyclic Prefix (CP) having a length of 4 micro. Seconds, typically, the cyclic prefix length is 0.8 microseconds.
  • the L-SIG has only one OFDM symbol
  • the HT-SIG and the VHT-SIG-A both contain two OFDM symbols
  • each OFDM symbol includes 64 subcarriers in the frequency domain, wherein the data subcarriers have 48 modulation symbols used to carry control information of the corresponding physical layer.
  • the modulation symbols carried on the data subcarriers of the two OFDM symbols of the HT-SIG are modulated by Quadrature Binary Phase Shift Keying (QBPSK); wherein QBPSK modulation is compared with the usual Binary Phase Shift Keying (BPSK) constellation is rotated 90 degrees, as shown in Figure 3.
  • QBPSK Quadrature Binary Phase Shift Keying
  • BPSK Binary Phase Shift Keying
  • the receiver of 802.11n can be characterized according to the first OFDM symbol after the L-SIG of the received WLAN physical layer packet, ie Whether the modulation symbols carried on the 48 data subcarriers are QBPSK modulation to distinguish the physical layer packets of 802.11n and 802.11a.
  • the modulation symbols carried on the data subcarriers of the second OFDM symbol of the VHT-SIG-A are also QBPSK modulated, but the modulation symbols carried on the data subcarriers of the first OFDM symbol are BPSK modulated.
  • the 802.11n receiver does not consider the physical layer packet of 802.11ac as the physical layer packet of 802.11n, and the 802.11ac receiver can group the first OFDM symbol after the L-SIG according to the received WLAN physical layer.
  • the modulation symbols carried on the 48 data subcarriers are QBPSK modulation to distinguish the physical layer packets of 802.11ac and 802.11a, and according to the received WLAN physical layer packet 48 data of the second OFDM symbol after the L-SIG Whether the modulation symbol carried on the subcarrier is BPSK modulation to distinguish the physical layer packets of 802.11ac and 802.11n.
  • Figure 4 shows a possible 802.11ax physical layer packet structure, the first part of which is also the traditional preamble, namely the field consisting of L-STF, L-LTF and L-SIG, and finally the data field, the traditional preamble
  • the 802.11ax protocol-specific preamble that is, the HEW preamble.
  • the first field of the HEW preamble is the high efficiency signaling A field (High Efficiency Signal-A).
  • HE-SIG-A consists of at least one OFDM symbol of length 4 microseconds, between L-SIG and HE-SIG-A, the first OFDM after L-SIG The symbol is an OFDM symbol of length 4 microseconds, and the second OFDM symbol after the L-SIG is the first OFDM symbol of HE-SIG-A.
  • 802.11n or 802.11ac receivers should be avoided to misidentify 802.11ax physical layer packets as 802.11n or 802.11ac physical layer packets. For this reason, 802.11ax physical layer packets
  • the first and second OFDM symbols after the L-SIG are both BPSK modulated, as shown in FIG.
  • the first OFDM symbol after the L-SIG is proposed as the repetition of the L-SIG, that is, the L-SIG.
  • the first OFDM symbol after is the same as the data information of the OFDM symbol transmission of the L-SIG, and is called RL-SIG (Repeated L-SIG).
  • the RL-SIG is generated by multiplying the BPSK signal of the data subcarrier of the L-SIG by a certain feature sequence consisting of +1 or -1, as shown in FIG. 5.
  • the receiver of 802.11ax After receiving the RL-SIG, the receiver of 802.11ax multiplies the feature sequence on the data subcarrier of the RL-SIG, and then repeatedly compares the obtained data with the data of the L-SIG to correctly identify the 802.11ax. Physical layer grouping. However, this feature sequence is currently undetermined.
  • the feature sequence is all +1 or all -1.
  • the receiving end can judge whether it is positive correlation or negative correlation according to the correlation between the signals on the RL-SIG and L-SIG data subcarriers. According to this correlation, one bit of information can be transmitted.
  • the 5 GHz band where the WLAN is located is an unlicensed spectrum. Other devices except the WLAN may use the band, or the out-of-band leakage of other wireless devices may enter the band, and many of these interference signals have periodicity.
  • the feature sequence is a sequence of all +1s
  • the feature that RL-SIG and L-SIG completely repeat is susceptible to periodic interference signals, thereby increasing the physical layer grouping of non-802.11ax physical layer packets into 802.11ax.
  • the prior art does not consider support for the new version protocol after 802.11ax, that is, the new version protocol needs to redesign a new way to automatically detect the physical layer grouping of the new version protocol.
  • the receiving end judges one bit information by judging the signal correlation between the RL-SIG and the L-SIG on the data subcarrier corresponding to the first half element; likewise, the receiving end determines that the RL-SIG and the L-SIG correspond to the second half element. Signal correlation on the data subcarriers determines another bit information.
  • the error rate performance of the prior art 2 is less than about 3 to 4 dB compared with the prior art 1; in addition, since the prior art 2 is only The corresponding data subcarrier of a certain bit is selected within 10 MHz instead of being selected at 20 MHz, so that the prior art 2 does not acquire the diversity gain of the entire 20 MHz.
  • the packet length information is obtained by decoding the information of the L-SIG and the RL-SIG, and one bit information is indicated by whether the remainder obtained by dividing the length information by 3 is 1 or 2.
  • the packet length information transmitted by the 802.11ax data packet is not an integral multiple of 3, that is, the remainder after division by 3 is 1 or 2.
  • the remainder can be used to indicate one bit of information.
  • the receiving end needs to perform complex process decoding to obtain packet length information, and the processing time is long. When using the hidden information to indicate the next symbol, there may be no time to indicate
  • Embodiment 1 of the present invention provides a data detection method applied to a WLAN, and the method can be applied to a site, such as the AP and STA1-STA3 in FIG. 1, and the site can support a next-generation WLAN standard, for example, 802.11ax System.
  • Figure 6 is a flow chart of the data detection method, the specific steps are as follows:
  • Step 110 Receive a physical layer protocol data unit PPDU.
  • Step 120 Multiply the signal of the data subcarrier in the traditional signaling field L-SIG in the PPDU with the signal of the corresponding position data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG .
  • Step 130 Determine information carried by the PPDU according to the result of the multiplication.
  • the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG in the present invention refers to the RL-SIG, and both represent the same concept.
  • step 120 and step 130 in Embodiment 1 include at least two processing methods.
  • Method 1 The result of the multiplication is divided into two groups, each group includes data subcarriers that are discontinuous in the frequency domain, and the first bit information is determined according to the result of the first group, and the second is determined according to the result of the second group. Bit information.
  • the L-SIG includes 48 data subcarriers, and the following is an example of 48 data subcarriers.
  • the above 48 data subcarriers are numbered as subcarriers 1-48 according to the frequency from small to large, and the signal of the data subcarrier in the L-SIG is multiplied by the signal of the data subcarrier in the first OFDM symbol after the L-SIG.
  • the odd subcarriers (1, 3, 5, ..., 47) are set to the first group, and the even subcarriers (2, 4, 6, ..., 48) are set to the second group, and the two sets of data are respectively calculated.
  • the result of carrier multiplication If the result of the first group is greater than 0, it is determined that the first bit information is 1. If the result of the first group is less than or equal to 0, it is determined that the first bit information is 0, and the value of the first bit information may have other definitions. If the result of the first group is greater than 0, it is determined that the first bit information is 0. If the result of the first group is less than or equal to 0, it is determined that the first bit information is 1. The value of the second bit information is the same as the first bit information, and will not be described again.
  • the subcarrier number module modulo 4 and the modulo 4 remainder 2 (1, 2, 5, 6, ..., 45, 46) are set to the first group, and the subcarrier number module modulo 4 is 0 and the modulo 4 is used.
  • 3 (3, 4, 7, 8, ..., 47, 48) is set to the second group, and the result of multiplying the two sets of data subcarriers is calculated separately.
  • the calculation method of the first bit information and the second bit information is the same as above, and will not be described again.
  • Method 2 Divide the data subcarriers in the L-SIG into two groups, each group including data subcarriers in which the frequency domain is discontinuous;
  • the first bit information is determined according to the result of the first group multiplication, and the second bit information is determined according to the result of the second group multiplication.
  • FIG. 7 shows an information detecting method of the method 2.
  • the 802.11ax receiver After receiving the time domain signal of the first OFDM symbol after the L-SIG of a WLAN physical layer packet, the 802.11ax receiver removes the L-SIG and the RL-SIG from the CP, and then passes the 64-point fast Fourier transform (FFT) is transformed into the frequency domain, and then the first bit information is separated.
  • FFT Fast Fourier transform
  • Correlation calculation is performed by multiplying the data subcarrier signal corresponding to the first bit in the L-SIG and the data subcarrier signal corresponding to the first bit in the RL-SIG.
  • the first bit information is judged by whether the result of the multiplication is a positive number or a negative number. Similarly, the data subcarrier signal corresponding to the second bit in the L-SIG and the data subcarrier signal corresponding to the second bit in the RL-SIG are multiplied, and the result of the multiplication is a positive or negative number to determine the second bit information.
  • the difference between the method 2 and the method 1 is that the method 1 first multiplies the signals of the data subcarriers, and then groups the multiplied results to obtain 2 bits of information.
  • Method 1 first groups the data subcarriers, then multiplies the signals of each group of data subcarriers, and obtains 2 bits of information according to the multiplied result.
  • the first bit information and the second bit information carried by the PPDU are used to indicate a protocol version to which the PPDU belongs. For example: “00" corresponds to the first WLAN standard, "01” corresponds to the second WLAN standard, and the like.
  • the RL-SIG needs to not only do the repetitive comparison of the L-SIG, but also pass the following three aspects of information.
  • the RL-SIG needs to indicate whether the HE-SIG-A after the RL-SIG is to perform repeated transmission. In different scenarios, such as indoor and outdoor, signal strength, environmental conditions, and interference, HE-SIG-A may need to repeat transmission in some scenarios, but not in some scenarios. This requires a bit of indication.
  • at least one extra bit may be required for indication. If there is no indication, the new version of the protocol may need to be redesigned in a new way to the physical layer of the new version of the protocol. The group is automatically detected.
  • the ambiguity indication of the Signal extension may also require the RL-SIG to transmit information.
  • the RL-SIG can deliver at least 2 bits of information. This paragraph also applies to other embodiments of the invention.
  • the signal of the data subcarrier in the traditional signaling field L-SIG in the PPDU and the first OFDM symbol after the L-SIG are used in the data detection process of the WLAN.
  • the signal of the corresponding position data subcarrier is multiplied, and the information carried by the PPDU is determined according to the result of the multiplication. According to the above manner, the 11ax physical layer packet can be efficiently distinguished, and the misjudgment caused by the periodic signal is avoided.
  • Embodiment 2 of the present invention provides a data detection method applied to a WLAN, and the method It can be applied to sites such as AP and STA1-STA3 in Figure 1, which can support next-generation WLAN standards such as 802.11ax.
  • FIG. 8 is a flowchart of the data detecting method, and the specific steps are as follows:
  • Step 210 Receive a physical layer protocol data unit PPDU.
  • Step 220 Multiply a signal of the data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU with one or more feature sequences.
  • Step 230 Perform cross-correlation processing on the multiplied signal and the L-SIG.
  • Step 240 Determine information carried by the PPDU according to the result of the cross-correlation processing.
  • step 220 and step 230 include at least two schemes.
  • Scheme 1 The signal of the data subcarrier in the first OFDM symbol after the L-SIG is multiplied by the signature sequence.
  • the processing block diagram of the scheme 1 is as shown in FIG.
  • the transmitter multiplies the first OFDM symbol after the L-SIG by the feature sequence to obtain the scrambled OFDM symbol. If the PPDU does not have a transmission error, the receiver pair The scrambled OFDM symbol is then multiplied by the feature sequence to obtain the original content of the OFDM symbol. The OFDM symbol is cross-correlated with the L-SIG. If the cross-correlation result is greater than the threshold, the receiver determines that the PPDU belongs to the 802.11ax packet. If the cross-correlation result is less than or equal to the threshold, the PPDU belongs to the legacy WLAN packet.
  • the feature sequence mentioned in the scheme 1 is a sequence consisting of +1 and -1, and the feature sequence is composed of a bit subsequence including: [+1 +1 +1 +1] , [+1 +1-1 -1], [+1 -1 -1 +1], [+1 -1 +1 -1], [-1 -1 -1 -1], [-1 -1 +1 +1], [-1 +1 +1-1] or [-1 +1 -1 +1].
  • the number of data subcarriers in the feature sequence mentioned in this embodiment is the same as the number of data subcarriers in the L-SIG, and the number of data subcarriers in the feature sequence and the first OFDM after the L-SIG The number of data subcarriers in the symbol is the same. Preferably, the number of data subcarriers in the feature sequence is 48 or 52.
  • the declaration of this sequence of features is also applicable to other embodiments of the invention.
  • the feature sequence includes 48 data subcarriers
  • the feature sequence consists of 12 bit subsequences, while the bit subsequence has 8 possibilities.
  • the odd subcarriers are +1, and the even subcarriers are -1.
  • the odd subcarriers are -1, and the even subcarriers are +1.
  • the feature sequence three neutron carrier number modulo 4 remainder 3 and modulo 4 remainder zero is +1, and the rest is -1.
  • the feature sequence four neutron carrier number modulo 4 and modulo 4 are both -1 and the rest are +1.
  • the eigen sequence five neutron carrier number modulo 4 and the modulo 4 are three -1, the rest are +1, the feature sequence six neutron carrier number modulo 4 and the modulo 4 are three +1, the rest is -1 .
  • the feature sequence seven neutron carrier number modulo 4 is one, two and three is +1, and the rest is -1. Characteristic The sequence eight neutron carrier number modulo 4 is one, two and three is -1, and the rest is +1.
  • the feature sequence nine neutron carrier number modulo 4 is one, two and four are -1, and the rest is +1.
  • the feature sequence ten neutron carrier number modulo 4 is one, two and four is +1, and the rest is -1.
  • Characteristic sequence eleven [-1, +1, -1, -1, -1, +1, -1, -1, -1, +1, -1, -1, -1, +1, -1, -1, +1, -1,-1,-1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,- 1, -1, +1, -1, -1, -1, +1, -1, -1, -1, +1, -1, -1, -1, +1, -1, -1, +1, -1, -1, -1, +1, -1, -1, -1]
  • the characteristic sequence is twelve [+1,-1,+1,+1, +1,-1,+1,+1, +1,-1,+1,+1,+1,-1,+1, +1, +1, +1, -1, +1, +1, +1, +1, -1, +1, +1, +1, +1, -1, +1, +1, +1, +1, -1, +1, +1, +1, +1, -1,+1,+1, +1, +1,-1,+1,+1,+1, +1,-1,+1,+1,+1,+1,+1,+1]
  • the characteristic sequence eleven neutron carrier number modulo 4 is one, three and four is -1, and the rest is +1.
  • the characteristic sequence twelve neutron carrier number modulo 4 is one, three and four is +1, and the rest is -1.
  • Characteristic sequence thirteen [-1, +1, +1, +1, +1, +1, +1, -1, +1, +1, +1, -1, +1, +1, +1, -1, +1, +1, +1, -1,+1,+1,+1, -1,+1,+1,+1,+1,-1,+1,+1,+1,+1,+ 1, -1, +1, +1, +1, +1, -1, +1, +1, +1, +1, -1, +1, +1, +1, +1]
  • the characteristic sequence is fourteen [+1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1,+1,-1,-1, -1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1,-1, +1,-1,-1,-1,-1,-1]
  • the characteristic sequence thirteen neutron carrier number modulo 4 is two, three and four is +1, and the rest is -1.
  • the fourteenth neutron carrier number of the feature sequence is 4-1, the remainder of the three, three and four is -1, and the rest is +1.
  • the fifteenth neutron carrier number of the feature sequence is divided into one group for each of the three data subcarriers, and is respectively given +1. -1 interleaved results.
  • the characteristic sequence is sixteen [-1,-1,-1,+1,+1,+1, -1,-1,-1,+1,+1,+1,-1,-1,-1, +1,+1,+1, -1,-1,+1,+1,+1, -1,-1,+1,+1,+1,-1,-1,+1,+1,+1, -1,-1,+1,+1,+1, -1,-1,+1,+1,+1]
  • the sixteenth subcarrier number of the feature sequence is divided into one group for each of the three data subcarriers, and the result of +1,-1 interleaving is respectively given.
  • the characteristic sequence is seventeen [+1, +1, +1, +1, +1, -1, -1, -1, +1, +1, +1, +1, -1, -1, -1,+1,+1,+1,+1,-1,-1,-1, +1,+1,+1,+1,-1,-1,-1,-1 , +1,+1,+1,+1,-1,-1,-1 , +1, +1, +1, +1, -1, -1,-1, , +1, +1, +1, -1, -1, -1, +1, +1, +1, +1, -1, -1, -1, -1, -1, -1, +1, +1, +1, +1, -1, -1, -1, -1, -1, -1, -1, -1, +1, +1, +1, +1, -1, -1, -1, -1, -1, -1, -1, -1, -1, +1, +1, +1, -1
  • the seventeenth subcarrier number of the feature sequence is divided into one group for each of the four data subcarriers, and the result of +1,-1 interleaving is respectively given.
  • the characteristic sequence is eighteen [-1,-1,-1,-1,-1,+1,+1,+1,+1, -1,-1,-1,+1,+1,+1, +1,-1,-1,-1,+1,+1,+1, -1,-1,-1,+1,+1,+1,+1, -1,-1,-1,+1,+1,+1,+1, -1,-1,-1,+1,+1,+1,+1]
  • the eighteenth neutron carrier number of the feature sequence is divided into one group for each of the four data subcarriers, and the result of the -1, +1 interleaving is respectively given.
  • the characteristic sequence is nineteen [+1, +1, +1, +1, +1, +1, +1, +1, -1, -1, -1, -1, +1, +1, +1,+1,+1, -1,-1,-1, +1,+1,+1,+1,+1,-1,-1,-1, +1,+1,+1,+1,+1,-1,-1,-1, +1,+1,+1,+1,+1,-1,-1,-1,-1, +1,+1,+1,+1,+1, -1,-1,-1,-1,-1, +1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1
  • the nineteenth subcarrier number of the feature sequence is divided into one group for each of the six data subcarriers, and the result of +1,-1 interleaving is respectively given.
  • the characteristic sequence is twenty [-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,-1,-1,-1,-1, +1,+1,+1,+1,+1, -1,-1,-1,-1,+1,+1 , +1, +1, +1, +1, -1, -1, -1, -1, +1, +1, +1, +1, +1, -1, -1, -1, -1, +1, +1, +1, +1, +1]
  • the feature sequence has twenty subcarrier numbers, and each of the six data subcarriers is divided into one group, and the result of the -1, +1 interleaving is respectively given.
  • the feature sequence twenty-one neutron carrier number is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to +1.
  • the sequence number is divided by 3 and the remainder is divided into two groups, and the value is +1. Except The group of 3 remainders is 0, and the value is -1.
  • the characteristic sequence 22 neutron carrier number is divided into 3 groups, wherein the sequence number is divided into 3 groups with a remainder of 1 and the value is assigned to -1.
  • the sequence number is divided by 3 and the remainder is 2, and the value is assigned to -1.
  • the feature sequence twenty-three neutron carrier number is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to +1.
  • the sequence number is divided into three groups with a remainder of 2, and the value is assigned to a group. Divide by a group with 3 remainders of 0, and assign +1.
  • the feature sequence twenty-four neutron carrier number is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1.
  • the sequence number is divided into three groups with a remainder of 2, and the value is +1. Divided by a group of 3 remainders of 0, assigned a value of -1.
  • the characteristic sequence twenty-fifth neutron carrier number is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to +1.
  • the sequence number is divided into three groups with a remainder of 2, and the value is assigned to a group. Divided by a group of 3 remainders of 0, assigned a value of -1.
  • the characteristic sequence twenty-sixth neutron carrier number is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1.
  • the sequence number is divided into three groups with a remainder of 2, and the value is +1. Divide by a group with 3 remainders of 0, and assign +1.
  • the characteristic sequence of the twenty-seventh neutron carrier gives a sequence number to each of the two subcarriers, and is divided into three groups, wherein the sequence number is divided by the three remainders into one, and the value is +1, and the sequence number is divided by 3 and the remainder is divided into two.
  • a group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned -1.
  • Each of the two subcarriers of the twenty-eighth neutron carrier of the feature sequence is given a sequence number, which is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence twenty-nine neutron carrier gives a sequence number to each two subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1 and the value is assigned to +1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence is thirty [-1,-1,+1,+1,-1,-1, -1,-1,+1,+1,-1,-1, -1,+1, +1,-1,-1,-1,+1,+1,-1,-1, -1,+1,+1,-1,-1, -1,-1,+1,+1,-1,-1, -1,+1,+1,-1,-1,-1,+1,+1,-1,-1,-1,+1,+1,-1,-1,-1,+1,+1,-1,-1]
  • the characteristic sequence thirty neutron carrier gives a sequence number to each two subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1, and the sequence number is divided by 3 and the remainder is divided into two. Group, assignment +1, the sequence number divided by 3 remainders is 0, and the assignment is -1.
  • the characteristic sequence thirty-one neutron carrier gives a sequence number to each two subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of one, and the value is +1, and the number is divided by three.
  • a group assigned a value of -1, divided by a number of 3 remainders into a group, assigned a value of -1.
  • the characteristic sequence is thirty-two [-1,-1,+1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1, +1, +1,-1,-1,+1,+1,+1,+1, -1,+1,+ 1, +1, +1]
  • the characteristic sequence thirty-two neutron carriers are given a sequence number for each two subcarriers, and are divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1, and the number is divided by 3 and the remainder is divided into two. A group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned value +1.
  • the characteristic sequence thirty-three [+1, +1, +1, +1, +1, +1, +1, +1, +1, +1, -1, -1, -1, +1, +1, +1, +1, +1, +1, +1, +1, +1, +1, -1, -1, +1, +1, +1, +1, + 1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1]
  • the characteristic sequence thirty-three neutron carriers are given a sequence number for each of the four sub-carriers, and are divided into three groups, wherein the sequence number is divided into three groups with a remainder of one, and the value is +1, and the number is divided by three.
  • a group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned -1.
  • the characteristic sequence 34 sub-carriers are given a sequence number for each 4 sub-carriers, and are divided into 3 groups, wherein the sequence number is divided into 3 groups with a remainder of 1 and assigned a value of -1, and the sequence number is divided by 3 and the remainder is divided into 2 A group, assigned a value of -1, divided by a number of 3 remainders into a group, assigned value +1.
  • the characteristic sequence of the thirty-fifth neutron carrier is given a sequence number for each of the four subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to +1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence 36 subcarriers give a sequence number to each of the 4 subcarriers, and is divided into 3 groups, wherein the sequence number is divided into 3 groups with 1 remainder, the assignment is -1, and the sequence number is divided by 3 and the remainder is 2 A group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned -1.
  • the characteristic sequence of the thirty-seventh subcarriers is given a sequence number for each of the four subcarriers, and is divided into three groups, wherein the sequence number is divided by the three remainders into one group, and the value is assigned to +1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence 38 neutron carrier is given a sequence number for each 4 subcarriers, and is divided into 3 groups, wherein the sequence number is divided into 3 groups with 1 remainder, the assignment is -1, and the sequence number is divided by 3 and the remainder is 2 A group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned value +1.
  • the characteristic sequence 39 subcarriers give a sequence number to each 8 subcarriers, and are divided into 3 groups, wherein the sequence number is divided into 3 groups with 1 remainder, the assignment is +1, and the sequence number is divided by 3 and the remainder is 2 A group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned -1.
  • the characteristic sequence of the forty neutron carrier is given a sequence number for each of the eight subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1, and the number is divided by 3 and the remainder is divided into two. Group, assignment -1, the number is divided by 3 and the remainder is 0, and the assignment is +1.
  • the characteristic sequence of the forty-first neutron carrier is given a sequence number for each of the 8 subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to +1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence of the forty-two neutron carrier is given a sequence number for each of the eight subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1, and the sequence number is divided by 3 and the remainder is divided into two. A group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned -1.
  • the characteristic sequence of the forty-three neutron carrier is given a sequence number for each of the eight subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to +1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence forty-four neutron carriers is given a sequence number for each of the eight subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1, and the number is divided by 3 and the remainder is divided into two. A group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned value +1.
  • the characteristic sequence of the forty-fifth neutron carrier is given a sequence number for each of the 16 subcarriers, and is divided into three groups, wherein the sequence number is divided by the three remainders into one, and the value is +1, and the sequence number is divided by the remainder of the three.
  • a group, assigned value +1, the serial number divided by 3 remainder is 0, divided into a group, assigned -1.
  • the feature sequence forty-six subcarriers is given a sequence number for each of the 16 subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, the assignment is -1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence of the forty-seventh subcarriers is given a sequence number for each of the 16 subcarriers, and is divided into three groups.
  • the serial number divided by 3 is divided into 1 group, assigned value +1, the serial number divided by 3 remainder is divided into 2 groups, assigned value -1, the serial number divided by 3 remainder is 0, divided into one group, assignment + 1.
  • the characteristic sequence of the forty-eighth neutron carrier is given a sequence number for each of the 16 subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1, and the sequence number is divided by 3 and the remainder is divided into two groups. , Assignment -1, the number is divided by 3 and the remainder is 0, and the value is +1.
  • the characteristic sequence of the forty-ninth neutron carrier is given a sequence number for each of the 16 subcarriers, and is divided into three groups, wherein the sequence number is divided into three groups with a remainder of 1 and the value is assigned to +1, and the sequence number is divided by 3 and the remainder is divided into two.
  • the characteristic sequence is fifty [-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1, -1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1]
  • Each of the 16 subcarriers of the feature sequence is given a sequence number for each of the 16 subcarriers, and is divided into three groups.
  • the sequence number is divided into three groups with a remainder of 1, and the value is assigned to -1.
  • the sequence number is divided by 3 and the remainder is divided into two. Group, assignment +1, the serial number divided by 3 remainder is 0, divided into one group, assigned value +1.
  • the feature sequence twenty-one to the feature sequence fifty can be used to indicate three bits of implicit information.
  • Scenario 2 multiplying signals of data subcarriers in the first OFDM symbol after the L-SIG by two feature sequences to obtain a first scrambling sequence and a second scrambling sequence, and the first scrambling sequence And the second scrambling sequence is separately correlated with the L-SIG.
  • FIG. 10 shows a bit information detecting method of the 802.11ax physical layer packet in the scheme 2.
  • the 802.11ax receiver After receiving the time domain signal of the first OFDM symbol after the L-SIG of a WLAN physical layer packet, the 802.11ax receiver removes the L-SIG and the RL-SIG from the CP, and then passes the 64. The Fast Fourier Transform (FFT) of the point is transformed into the frequency domain. Then, the data subcarrier signals of the RL-SIG are multiplied by the feature sequence 1 and the feature sequence 2, respectively, and the obtained results are multiplied by the data subcarrier signals of the L-SIG to obtain two multiplied results, and then the multiplication results are performed.
  • FFT Fast Fourier Transform
  • the selected feature sequence is the last judged feature sequence, and two bit information can be obtained by the feature sequence; if the multiplication result is larger If the number is negative, the feature sequence of all the selected feature sequences multiplied by -1 is the last judged feature sequence, and two bit information can be obtained by the feature sequence.
  • the feature sequence mentioned in the scheme 2 is the same as that in the scheme 1, and will not be described again.
  • the signal of the data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU and one or more characteristics are used in the data detection process of the WLAN.
  • the sequence is multiplied, and the multiplied signal is cross-correlated with the L-SIG.
  • FIG. 11 is a schematic block diagram of a data detecting apparatus in a wireless local area network according to Embodiment 3 of the present invention.
  • the data transmission device is, for example, a site or a dedicated circuit or chip that implements related functions.
  • the data transmission device 1100 shown in FIG. 11 includes a processing unit 1101 and a transceiver unit 1102.
  • the channel indication device 1100 may be the AP or STA1-STA3 shown in FIG. 1.
  • the station in Embodiment 3 acts as a receiver.
  • the transceiver unit 1102 is configured to receive a physical layer protocol data unit PPDU;
  • the processing unit 1101 is configured to: the signal of the data subcarrier in the traditional signaling field L-SIG in the PPDU and the corresponding position data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG Signal multiplication;
  • the processing unit 1101 is further configured to determine information carried by the PPDU according to the result of the multiplication.
  • At least two schemes are included.
  • Solution 1 The processing unit 1101 divides the multiplied results into two groups, each group includes data subcarriers that are discontinuous in the frequency domain, and determines first bit information according to the result of the first group, according to the result of the second group. Determine the second bit information.
  • the processing unit divides the data subcarriers in the L-SIG into two groups, each group Both include data subcarriers that are discontinuous in the frequency domain;
  • the processing unit determines the first bit information according to the result of the first group multiplication, and determines the second bit information according to the result of the second group multiplication.
  • the difference between the method 2 and the method 1 is that the method 1 first multiplies the signals of the data subcarriers, and then groups the multiplied results to obtain 2 bits of information.
  • Method 1 first groups the data subcarriers, then multiplies the signals of each group of data subcarriers, and obtains 2 bits of information according to the multiplied result.
  • the first bit information and the second bit information carried by the PPDU are used to indicate a protocol version to which the PPDU belongs.
  • the information carried by the PPDU has been explained in the foregoing embodiment, and details are not described herein.
  • the processing unit multiplexes the signal of the data subcarrier in the traditional signaling field L-SIG in the PPDU with the first orthogonal frequency division after the L-SIG.
  • the signals of the corresponding position data subcarriers in the OFDM symbol are multiplied, and the information carried by the PPDU is determined according to the result of the multiplication. According to the above manner, the 11ax physical layer packet can be efficiently distinguished, and the misjudgment caused by the periodic signal is avoided.
  • FIG. 12 is a schematic block diagram of a data detecting apparatus in a wireless local area network according to Embodiment 4 of the present invention.
  • the data transmission device is, for example, a site or a dedicated circuit or chip that implements related functions.
  • the data transmission device 1200 shown in FIG. 12 includes a processing unit 1201 and a transceiver unit 1202.
  • the channel indication device 1200 can be the AP or STA1-STA3 shown in FIG.
  • the station in Embodiment 4 acts as a receiver.
  • the transceiver unit 1202 is configured to receive a physical layer protocol data unit (PPDU);
  • PPDU physical layer protocol data unit
  • the processing unit 1201 is configured to multiply a signal of the data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU by one or more feature sequences;
  • the processing unit 1201 is further configured to perform cross-correlation processing on the multiplied signal and the L-SIG;
  • the processing unit 1201 is further configured to determine, according to a result of the cross-correlation processing, Information carried by the PPDU.
  • At least two schemes are included.
  • Scheme 1 The signal of the data subcarrier in the first OFDM symbol after the L-SIG is multiplied by the signature sequence.
  • Scenario 2 The signals of the data subcarriers in the first OFDM symbol after the L-SIG are respectively multiplied by two feature sequences to obtain a first scrambling sequence and a second scrambling sequence;
  • the first scrambling sequence and the second scrambling sequence are cross-correlated with the L-SIG, respectively.
  • the processing unit in the scheme 2 determines the first bit information according to the result of the cross-correlation processing performed by the first scrambling sequence with the L-SIG, and performs cross-correlation processing on the second scrambling sequence and the L-SIG according to the second scrambling sequence. Determine the second bit information.
  • the feature sequence is a sequence consisting of +1 and -1, and the feature sequence includes a bit subsequence or a plurality of bit subsequences, and the bit subsequence includes: [+1 +1 +1 +1] , [+1 +1 -1 -1], [+1 -1 -1 +1], [+1 -1 +1 -1], [-1 -1 -1 -1 ], [-1 -1 +1 +1], [-1 +1 +1 -1], or [-1 +1 -1 +1].
  • the number of data subcarriers in the feature sequence is the same as the number of data subcarriers in the L-SIG, and the number of data subcarriers in the feature sequence is the same as the number of data subcarriers in the first OFDM symbol after the L-SIG.
  • the processing unit compares the signal of the data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU with one or more The feature sequences are multiplied, and the multiplied signal is cross-correlated with the L-SIG.
  • FIG. 13 is a block diagram of a data detecting apparatus of an embodiment of the present invention.
  • the site 1300 of FIG. 13 includes a processor 1310, a memory 1320, and a transceiver 1340.
  • Processing unit 1310 controls the operation of station 1300.
  • Memory 1320 can include read only memory and random access memory and provides instructions and data to processing unit 1310.
  • a portion of memory 1320 may also include non-volatile line random access memory (NVRAM).
  • NVRAM non-volatile line random access memory
  • the various components of station 1300 are coupled together by a bus system 1330, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 1330 in the figure.
  • the method for transmitting the foregoing various data detections disclosed in the foregoing embodiments of the present invention may be applied to the processor 1310 or implemented by the processor 1310.
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1310 or an instruction in a form of software.
  • the processor 1310 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or perform the embodiments of the present invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1320, and the processing unit 1310 reads the information in the memory 1320 and performs the steps of the above method in combination with its hardware.
  • the memory 1320 stores an instruction that causes the processing unit 1310 to: receive a physical layer protocol data unit PPDU; and after the signal of the data subcarrier in the legacy signaling field L-SIG in the PPDU and the L-SIG The signals of the corresponding position data subcarriers in the first orthogonal frequency division multiplexing OFDM symbol are multiplied; and the information carried by the PPDU is determined according to the result of the multiplication.
  • the memory 1320 stores instructions that cause the processing unit 1310 to also perform the following operations:
  • a physical layer protocol data unit PPDU Receiving a physical layer protocol data unit PPDU; multiplying a signal of the data subcarrier in the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the PPDU by one or more feature sequences; The multiplied signal is subjected to cross-correlation processing with the L-SIG; and the information carried by the PPDU is determined according to the result of the cross-correlation processing.

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Abstract

本发明提供了一种数据检测方法，应用于无线局域网中，该方法包括：将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，根据相乘的结果确定所述PPDU携带的信息，通过上述方式，本发明实施例还提供了相应的数据检测装置。通过应用本发明的方法和装置，可以高效地区分11ax物理层分组，避免接收到周期信号导致的误判。

Description

一种数据检测方法和装置 技术领域
本发明属于通信技术领域，尤其涉及一种数据检测方法和装置。
背景技术
现有基于OFDM(英文：Orthogonal Frequency-Division Multiplexing，中文：正交频分复用)技术的无线局域网(英文：Wireless local Access Network，简称：WLAN)标准由逐步演进的802.11a、802.11n、802.11ac等版本组成，目前IEEE(英文：Institute of Electrical and Electronic Engineers，中文：电气与电子工程师协会)802.11标准组织已启动了称之为HEW(High Efficiency WLAN，高效率无线局域网)的新一代WLAN标准802.11ax的标准化工作，通过引入OFDMA(Orthogonal Frequency-Division Multiple Access，正交频分复用多址)技术，802.11ax可以进一步提高WLAN在密集用户场景下的传输性能。
然而，现有的WLAN设备，并不能很好区分802.11ax分组，周期信号，传统的WLAN分组。
发明内容
在此提供一种数据检测方法和装置，可以高效地区分802.11ax分组，周期信号，以及传统的WLAN分组。
第一方面，本发明实施例提供了一种数据检测方法，应用于无线局域网WLAN，包括：
接收物理层协议数据单元PPDU；
将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘；
根据相乘的结果确定所述PPDU携带的信息。
结合第一方面，在第一方面的第一种可能的实现方式中，所述根据相乘的结果确定所述PPDU携带的信息，包括:将所述相乘的结果分为两 组，每一组都包括频域不连续的数据子载波，根据第一组的结果确定第一比特信息，根据第二组的结果确定第二比特信息。
结合第一方面，在第一方面的第二种可能的实现方式中，所述将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，包括：
将所述L-SIG中的数据子载波分成两组，每一组都包括频域不连续的数据子载波；
将L-SIG中第一组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘，将L-SIG中第二组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘；
所述根据相乘的结果确定所述PPDU携带的信息，包括：根据第一组相乘的结果确定第一比特信息，根据第二组相乘的结果确定第二比特信息。
结合第一方面第一种可能的实现方式以及第二种可能的实现方式中的任意一种可能的实现方式，在第一方面第三种可能的实现方式中，所述PPDU携带的第一比特信息和第二比特信息用于指示所述PPDU归属的协议版本。
第二方面，本发明实施例提供了一种数据检测方法，应用于无线局域网WLAN，包括：
接收物理层协议数据单元PPDU；
将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘；
将相乘后的信号与L-SIG做互相关处理；
根据所述互相关处理的结果确定所述PPDU携带的信息。
结合第二方面，在第二方面的第一种可能的实现方式中，所述将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个特征序列相乘，包括：
所述L-SIG之后的第一个OFDM符号中数据子载波的信号与所述特征序列相乘。
结合第二方面，在第二方面的第二种可能的实现方式中，所述特征序列为两个，所述将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与两个特征序列相乘，包括：
将所述L-SIG之后的第一个OFDM符号中数据子载波的信号分别与两个特征序列相乘，得到第一加扰序列和第二加扰序列；
所述将相乘后的信号与L-SIG做互相关处理，包括：
将第一加扰序列和第二加扰序列分别与L-SIG做互相关处理。
结合第二方面第二种可能的实现方式，在第二方面第三种可能的实现方式中，所述根据所述互相关处理的结果确定所述PPDU携带的信息，包括：根据所述第一加扰序列与L-SIG做互相关处理的结果确定第一比特信息，根据所述第二加扰序列与L-SIG做互相关处理的结果确定第二比特信息。
结合第二方面及其上述实现方式，在第二方面第四种可能的实现方式中，所述特征序列为+1和-1组成的序列，所述特征序列包括一个比特子序列或多个比特子序列，所述比特子序列包括：[+1 +1 +1 +1]、[+1 +1-1 -1]、[+1 -1 -1 +1]、[+1 -1 +1 -1]、[-1 -1 -1 -1]、[-1 -1 +1 +1]、[-1 +1 +1-1]或[-1 +1 -1 +1]。
结合第二方面及其上述实现方式，在第二方面第五种可能的实现方式中，所述特征序列中数据子载波数目与L-SIG中数据子载波数目相同，所述特征序列中数据子载波数目与L-SIG之后第一个OFDM符号中数据子载波数目相同。
第三方面，本发明实施例提供了一种数据检测装置，应用于无线局域网WLAN，包括：
收发单元，用于接收物理层协议数据单元PPDU；
处理单元，用于将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘；
所述处理单元，还用于根据相乘的结果确定所述PPDU携带的信息。
结合第三方面，在第三方面的第一种可能的实现方式中，所述处理单元根据相乘的结果确定所述PPDU携带的信息，包括:将所述相乘的结果分为两组，每一组都包括频域不连续的数据子载波，根据第一组的结 果确定第一比特信息，根据第二组的结果确定第二比特信息。
结合第三方面，在第三方面的第二种可能的实现方式中，所述处理单元将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，包括：
将所述L-SIG中的数据子载波分成两组，每一组都包括频域不连续的数据子载波；
将L-SIG中第一组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘，将L-SIG中第二组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘；
所述根据相乘的结果确定所述PPDU携带的信息，包括：根据第一组相乘的结果确定第一比特信息，根据第二组相乘的结果确定第二比特信息。
结合第三方面第一种可能的实现方式以及第二种可能的实现方式中的任意一种可能的实现方式，在第三方面第三种可能的实现方式中，所述PPDU携带的第一比特信息和第二比特信息用于指示所述PPDU归属的协议版本。
第四方面，本发明实施例提供了一种数据检测装置，应用于无线局域网WLAN，包括：
收发单元，用于接收物理层协议数据单元PPDU；
处理单元，用于将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘；
所述处理单元，还用于将相乘后的信号与L-SIG做互相关处理；
所述处理单元，还用于根据所述互相关处理的结果确定所述PPDU携带的信息。
结合第四方面，在第四方面的第一种可能的实现方式中，所述处理单元将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个特征序列相乘，包括：
所述L-SIG之后的第一个OFDM符号中数据子载波的信号与所述特 征序列相乘。
结合第四方面，在第四方面的第二种可能的实现方式中，所述特征序列为两个，所述处理单元将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与两个特征序列相乘，包括：
将所述L-SIG之后的第一个OFDM符号中数据子载波的信号分别与两个特征序列相乘，得到第一加扰序列和第二加扰序列；
所述将相乘后的信号与L-SIG做互相关处理，包括：
将第一加扰序列和第二加扰序列分别与L-SIG做互相关处理。
结合第四方面第二种可能的实现方式，在第四方面第三种可能的实现方式中，所述处理单元根据所述互相关处理的结果确定所述PPDU携带的信息，包括：根据所述第一加扰序列与L-SIG做互相关处理的结果确定第一比特信息，根据所述第二加扰序列与L-SIG做互相关处理的结果确定第二比特信息。
结合第四方面及其上述实现方式，在第四方面第四种可能的实现方式中，所述特征序列为+1和-1组成的序列，所述特征序列包括一个比特子序列或多个比特子序列，所述比特子序列包括：[+1 +1 +1 +1]、[+1 +1-1 -1]、[+1 -1 -1 +1]、[+1 -1 +1 -1]、[-1 -1 -1 -1]、[-1 -1 +1 +1]、[-1 +1 +1-1]或[-1 +1 -1 +1]。
结合第四方面及其上述实现方式，在第四方面第五种可能的实现方式中，所述特征序列中数据子载波数目与L-SIG中数据子载波数目相同，所述特征序列中数据子载波数目与L-SIG之后第一个OFDM符号中数据子载波数目相同。
本发明实施例在无线局域网的数据检测过程中，将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，根据相乘的结果确定所述PPDU携带的信息，通过上述方式，可以高效地区分11ax物理层分组，避免接收到周期信号导致的误判。
附图说明
图1为本发明实施例的应用场景图。
图2为现有WLAN标准中的物理层分组结构图。
图3为BPSK和QBPSK调制的星座图。
图4为802.11ax一种可能的物理层分组结构图。
图5为加扰的RL-SIG字段的生成过程。
图6为本发明实施例1的方法流程图。
图7为本发明实施例1的原理框图。
图8为本发明实施例2的方法流程图。
图9为本发明实施例2方法1的原理框图。
图10为本发明实施例2方法2的原理框图。
图11为本发明实施例3接收站点的逻辑结构图。
图12为本发明实施例4接收站点的逻辑结构图。
图13为本发明实施例5站点的物理结构图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面结合附图对本发明具体实施例作进一步的详细描述。为了全面理解本发明，在以下详细描述中提到了众多具体细节。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例可以应用于WLAN，目前WLAN采用的标准为IEEE802.11系列。WLAN可以包括多个基本服务集(英文：Basic Service Set，简称：BSS)，基本服务集中的网络节点为站点(英文：Station，简称：STA)，站点包括接入点类的站点(简称：AP，英文：Access Point)和非接入点类的站点(英文：None Access Point Station，简称：Non-AP STA)。每个基本服务集可以包含一个AP和多个关联于该AP的Non-AP STA。
接入点类站点，也称之为无线访问接入点或热点等。AP是移动用户进入有线网络的接入点，主要部署于家庭、大楼内部以及园区内部，典 型覆盖半径为几十米至上百米，当然，也可以部署于户外。AP相当于一个连接有线网和无线网的桥梁，其主要作用是将各个无线网络客户端连接到一起，然后将无线网络接入以太网。具体地，AP可以是带有WiFi(英文：Wireless Fidelity,中文：无线保真)芯片的终端设备或者网络设备。可选地，AP可以为支持802.11ax制式的设备，进一步可选地，该AP可以为支持802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN制式的设备。
非接入点类的站点(英文：None Access Point Station，简称：Non-AP STA)，可以是无线通讯芯片、无线传感器或无线通信终端。例如：支持WiFi通讯功能的移动电话、支持WiFi通讯功能的平板电脑、支持WiFi通讯功能的机顶盒、支持WiFi通讯功能的智能电视、支持WiFi通讯功能的智能可穿戴设备、支持WiFi通讯功能的车载通信设备和支持WiFi通讯功能的计算机。可选地，站点可以支持802.11ax制式，进一步可选地，该站点支持802.11ac、802.11n、802.11g、802.11b及802.11a等多种WLAN制式。
图1为一个典型的WLAN部署场景的系统示意图，包括一个AP和3个STA，AP分别与STA1、STA2和STA3进行通信。
为了更好地理解802.11ax的物理层分组结构，图2示出了802.11a、802.11n和802.11ac的物理层分组结构，其中，它们最开始的部分均为传统前导(Legacy Preamble)，即由传统短训练字段(Legacy Short Training field，简称L-STF)、传统长训练字段(Legacy Long Training field，简称L-LTF)和传统信令字段(Legacy Signal field，简称L-SIG)组成的字段。802.11a物理层分组在传统前导之后即为数据字段，802.11n和802.11ac物理层分组在传统前导和数据字段之间，还增加了协议特定的前导。其中，802.11n物理层分组的协议特定前导由高吞吐量信令字段(High Throughput Signal field，简称HT-SIG)、高吞吐量短训练字段(High Throughput Short Training field，简称HT-STF)和高吞吐量长训练字段(High Throughput Long Training field，简称HT-LTF)组成；802.11ac物理层分组的协议特定前导由极高吞吐量信令A字段(Very High Throughput Signal-A field，简称VHT-SIG-A)、极高吞吐量短训练字段(Very High Throughput Short Training field，简称VHT-STF)、极 高吞吐量长训练字段(Very High Throughput Long Training field，简称VHT-LTF)和极高吞吐量信令B字段(Very High Throughput Signal-B field，简称VHT-SIG-B)组成。
在802.11a、802.11n、802.11ac等基于OFDM技术的WLAN标准中，每个物理层分组的基本构成单位为OFDM符号，每个OFDM符号包括循环前缀(Cyclic Prefix,简称CP)的长度为4微秒，典型地，循环前缀长度为0.8微秒。如图2所示，L-SIG只有一个OFDM符号，HT-SIG和VHT-SIG-A则均包含两个OFDM符号，每个OFDM符号在频域上包含64个子载波，其中，数据子载波有48个，用于承载相应物理层控制信息的调制符号。
在802.11n中，HT-SIG的两个OFDM符号的数据子载波上承载的调制符号采用正交二进制相移键控(Quadrature Binary Phase Shift Keying，简称QBPSK)调制；其中，QBPSK调制相比通常的二进制相移键控(Binary Phase Shift Keying，简称BPSK)星座图旋转了90度，如图3所示。由于802.11a在L-SIG之后的两个OFDM符号不会采用QBPSK调制，因此，802.11n的接收机可以根据所接收的WLAN物理层分组的L-SIG之后的第一个OFDM符号的特征，即其48个数据子载波上承载的调制符号是否为QBPSK调制来区分802.11n和802.11a的物理层分组。在802.11ac中，VHT-SIG-A第二个OFDM符号的数据子载波上承载的调制符号也采用QBPSK调制，但第一个OFDM符号的数据子载波上承载的调制符号采用了BPSK调制，因此，802.11n的接收机不会将802.11ac的物理层分组当作802.11n的物理层分组，而802.11ac的接收机则可根据所接收的WLAN物理层分组L-SIG之后的第一个OFDM符号的48个数据子载波上承载的调制符号是否为QBPSK调制来区分802.11ac和802.11a的物理层分组，并根据所接收的WLAN物理层分组L-SIG之后的第二个OFDM符号的48个数据子载波上承载的调制符号是否为BPSK调制来区分802.11ac和802.11n的物理层分组。
图4示出了一种可能的802.11ax的物理层分组结构，其最开始的部分也是传统前导，即由L-STF、L-LTF和L-SIG组成的字段，最后为数据字段，传统前导和数据字段之间为802.11ax协议特定的前导即HEW前导，HEW前导的第一个字段为高效率信令A字段(High Efficiency Signal-A  field，简称HE-SIG-A)，HE-SIG-A由至少一个长度为4微秒的OFDM符号组成，在L-SIG与HE-SIG-A之间，L-SIG之后的第一个OFDM符号为一个长度为4微秒的OFDM符号，L-SIG之后的第二个OFDM符号即为HE-SIG-A的第一个OFDM符号。
为了实现802.11ax物理层分组的自动检测，首先应避免802.11n或802.11ac的接收机将802.11ax的物理层分组误判为802.11n或802.11ac的物理层分组，为此，802.11ax物理层分组L-SIG之后的第一个和第二个OFDM符号均采用BPSK调制，如图4所示。
同时，为了让802.11ax的接收机能正确识别802.11ax的物理层分组并降低误判概率，标准制定中提出了在L-SIG之后的第一个OFDM符号为L-SIG的重复，即L-SIG之后的第一个OFDM符号与L-SIG的OFDM符号传输的数据信息相同，称为RL-SIG(Repeated L-SIG)。RL-SIG通过在L-SIG的数据子载波的BPSK信号乘以某一个由+1或-1组成的特征序列生成，具体过程如图5所示。802.11ax的接收机在接收到RL-SIG后，在RL-SIG的数据子载波上乘以该特征序列，然后把得到的数据和L-SIG的数据进行重复性比较，就能正确识别802.11ax的物理层分组。然而，目前该特征序列尚未确定。
其他公司提出利用RL-SIG传输信息比特的方案，包含以下三种技术方案。
现有技术一中，特征序列为全部+1或者全部-1。这样接收端可以根据RL-SIG和L-SIG数据子载波上信号的相关性，判断是正相关还是负相关。根据该相关性，可以传输一个比特信息。但是，现有技术一中存在一定的问题。首先，WLAN所在的5GHz频段为非授权频谱，除WLAN以外的其它设备均可能使用该频段，或者其它无线设备的带外泄漏可能进入该频段，而这些干扰信号很多具有周期性。当特征序列为全部+1的序列时，RL-SIG与L-SIG完全重复的特征容易受到周期性干扰信号的影响，从而增加将非802.11ax的物理层分组误判为802.11ax的物理层分组的风险；另外，现有技术一未考虑对802.11ax以后的新版本协议的支持，即新版本协议需要重新设计一个新的方式来对新版本协议的物理层分组进行自动检测。
现有技术二中，通过把RL-SIG的数据子载波分为两组，在20MHz上， 前10MHz分为一组，后10MHz分为一组，每一组传输一个比特信息。所以，现有技术二中，特征序列的前一半元素同时为全+1或全-1，后一半元素同时为全+1或全-1。这样，接收端通过判断RL-SIG和L-SIG在前一半元素对应的数据子载波上信号相关性判断一个比特信息；同样，接收端通过判断RL-SIG和L-SIG在后一半元素对应的数据子载波上信号相关性判断另一个比特信息。但是，现有技术二中存在问题，具体如下：通过传输2个比特信息，现有技术二比现有技术一的误比特率性能差了约3～4dB；另外，由于现有技术二只在10MHz内选取某一个比特的对应数据子载波，而不是在20MHz选取，因而现有技术二没有获取整个20MHz的分集增益。
现有技术三中，通过解码L-SIG和RL-SIG的信息，获取数据包长度信息，并通过该长度信息是否除以3得到的余数为1还是2来指示一个比特信息。在802.11ax系统中，为了区分新标准的数据包和过去标准的数据包，802.11ax数据包传输的数据包长度信息不是3的整倍数，即除以3之后余数为1或者2。从而，该余数可以用来指示一个比特信息。但是，现有技术三中存在一定的问题。在802.11ax系统中，接收端需要通过复杂的过程解码从而获取数据包长度信息，处理时间较长。在使用隐含信息指示下一个符号时，可能来不及进行指示
以上是对现有技术的表述，下面将阐释本发明提出的方案。
实施例1
本发明实施例1提供了一种应用于WLAN中的数据检测方法，该方法可以应用于站点，例如：图1中的AP和STA1-STA3，该站点可以支持下一代WLAN标准，例如：802.11ax制式。图6是该数据检测方法的流程图，具体步骤如下：
步骤110：接收物理层协议数据单元PPDU。
步骤120：将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘。
步骤130：根据相乘的结果确定所述PPDU携带的信息。
需要说明的是，本发明中L-SIG之后的第一个正交频分复用OFDM符号是指RL-SIG，两者表示同一个概念。
具体地，实施例1中步骤120和步骤130包括至少两种处理方法。
方法1：将所述相乘的结果分为两组，每一组都包括频域不连续的数据子载波，根据第一组的结果确定第一比特信息，根据第二组的结果确定第二比特信息。
具体地，L-SIG包含48个数据子载波，下面以48个数据子载波为例进行阐释。将上述48个数据子载波依据频率从小到大排序编号为子载波1-48，将L-SIG中数据子载波的信号与L-SIG后第一个OFDM符号中数据子载波的信号相乘。
示例性地，将奇数子载波(1,3,5…,47)设为第一组，将偶数子载波(2,4,6…,48)设为第二组，分别计算两组数据子载波相乘的结果。若第一组的结果大于0，则确定第一比特信息为1，若第一组的结果小于等于0，则确定第一比特信息为0，对于第一比特信息的取值也可以有其他定义，若第一组的结果大于0，则确定第一比特信息为0，若第一组的结果小于等于0，则确定第一比特信息为1。第二比特信息的取值同第一比特信息，不再赘述。
示例性地，将子载波序号模4余1以及模4余2(1,2,5,6…,45,46)设为第一组，将将子载波序号模4余0及模4余3(3,4,7,8…,47,48)设为第二组，分别计算两组数据子载波相乘的结果。第一比特信息和第二比特信息的计算方法同上，不再赘述。
方法2：将所述L-SIG中的数据子载波分成两组，每一组都包括频域不连续的数据子载波；
将L-SIG中第一组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘，将L-SIG中第二组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘。
根据第一组相乘的结果确定第一比特信息，根据第二组相乘的结果确定第二比特信息。
具体地，图7示出了方法2的信息检测方法。802.11ax接收机在接收到一个WLAN物理层分组的L-SIG之后的第一个OFDM符号的时域信号后，把L-SIG和RL-SIG分别去除CP，再通过64点的快速傅立叶变换(Fast Fourier transform，简称FFT)变换到频域，然后分离出第1比特信息对应 的数据子载波信号和第2比特信息对应的数据子载波信号。把L-SIG中对应第1比特的数据子载波信号和RL-SIG中对应第1比特的数据子载波信号相乘，即做相关性计算。通过相乘的结果是正数还是负数来判断第一个比特信息。同理，把L-SIG中对应第2比特的数据子载波信号和RL-SIG中对应第2比特的数据子载波信号相乘，相乘的结果是正数还是负数来判断第二个比特信息。
需要说明的是，方法2和方法1的区别在于：方法1先让数据子载波的信号相乘，然后对相乘的结果进行分组，得出2个比特的信息。方法1先对数据子载波进行分组，然后将每一组数据子载波的信号相乘，根据相乘的结果，得出2个比特的信息。
可选地，所述PPDU携带的第一比特信息和第二比特信息用于指示所述PPDU归属的协议版本。例如：“00”对应第一WLAN标准，“01”对应第二WLAN标准等等。
可选地，RL-SIG需要不仅仅做L-SIG的重复性比较，同时还可能传递以下三个方面的信息。首先，RL-SIG需要指示RL-SIG之后的HE-SIG-A是否做重复传输。在不同的场景中，比如室内和室外，信号的强度，环境的条件以及干扰不同，HE-SIG-A可能在一些场景下需要做重复传输，而在一些场景下不做重复传输。这就需要一个比特的指示信息。其次，在考虑到对802.11ax以后的新版本协议的支持方面，可能需要至少额外一个比特进行指示，如果没有指示，将来新版本协议可能需要重新设计一个新的方式来对新版本协议的物理层分组进行自动检测。除以上两条以外，Signal extension的模糊度指示，也可能需要RL-SIG进行信息传输。这样，考虑到以上三个方面，RL-SIG至少能够传递2个比特的信息。本段内容也同样适用于本发明其他实施例。
本发明实施例在无线局域网的数据检测过程中，将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，根据相乘的结果确定所述PPDU携带的信息，通过上述方式，可以高效地区分11ax物理层分组，避免接收到周期信号导致的误判。
实施例2
本发明实施例2提供了一种应用于WLAN中的数据检测方法，该方法 可以应用于站点，例如：图1中的AP和STA1-STA3，该站点可以支持下一代WLAN标准，例如：802.11ax制式。图8是该数据检测方法的流程图，具体步骤如下：
步骤210：接收物理层协议数据单元PPDU。
步骤220：将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘。
步骤230：将相乘后的信号与L-SIG做互相关处理。
步骤240：根据所述互相关处理的结果确定所述PPDU携带的信息。
具体地，步骤220和步骤230至少包括两种方案。
方案1：所述L-SIG之后的第一个OFDM符号中数据子载波的信号与所述特征序列相乘。
具体地，方案1的处理框图如图9所示。前述内容中提到，发射机在生成PPDU时，对L-SIG后的第一个OFDM符号与特征序列相乘后得到加扰后的OFDM符号，假设该PPDU没有发生传输错误，那么接收机对加扰后的OFDM符号再与特征序列相乘，得到该OFDM符号的原始内容。将该OFDM符号与L-SIG做互相关，若互相关结果大于门限值，则接收机判定该PPDU属于802.11ax分组，若互相关结果小于等于门限值，则该PPDU属于传统WLAN分组。
具体地，方案1中提到的所述特征序列为+1和-1组成的序列，所述特征序列由比特子序列组成，所述比特子序列包括：[+1 +1 +1 +1]、[+1 +1-1 -1]、[+1 -1 -1 +1]、[+1 -1 +1 -1]、[-1 -1 -1 -1]、[-1 -1 +1 +1]、[-1 +1 +1-1]或[-1 +1 -1 +1]。
需要说明的是，本实施例中提到的所述特征序列中数据子载波数目与L-SIG中数据子载波数目相同，所述特征序列中数据子载波数目与L-SIG之后第一个OFDM符号中数据子载波数目相同。优选地，特征序列中数据子载波数目为48或52个。对于该特征序列的声明，也适用于本发明其他实施例。
具体地，以特征序列包含48个数据子载波为例进行说明。该特征序列有12个比特子序列组成，而比特子序列有8种可能。除去全+1和全-1的序列，该特征序列包含812-2＝68719476734种可能，由于该特征序列的种类太多，只列举几种优选的特征序列。
特征序列一：[+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1, +1,-1,+1,-1,+1,-1, +1,-1,+1,-1,+1,-1, +1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1]
特征序列二：[-1,+1,-1,+1,-1,+1, -1,+1,-1,+1,-1,+1, -1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1,-1,+1]
特征序列一中奇数子载波为+1，偶数子载波为-1。特征序列二中奇数子载波为-1，偶数子载波为+1。
特征序列三：[+1,+1,-1,-1,+1,+1,-1,-1, +1,+1,-1,-1,+1,+1,-1,-1,+1,+1,-1,-1,+1,+1,-1,-1, +1,+1,-1,-1,+1,+1,-1,-1, +1,+1,-1,-1,+1,+1,-1,-1,+1,+1,-1,-1,+1,+1,-1,-1]
特征序列四：[-1,-1,+1,+1,-1,-1,+1,+1, -1,-1,+1,+1,-1,-1,+1,+1,-1,-1,+1,+1,-1,-1,+1,+1, -1,-1,+1,+1,-1,-1,+1,+1, -1,-1,+1,+1,-1,-1,+1,+1,-1,-1,+1,+1,-1,-1,+1,+1]
特征序列三中子载波序号模4余三和模4余零的为+1，其余为-1。特征序列四中子载波序号模4余一和模4余二为-1，其余为+1。
特征序列五：[+1,-1,-1,+1, +1,-1,-1,+1, +1,-1,-1,+1, +1,-1,-1,+1,+1,-1,-1,+1, +1,-1,-1,+1, +1,-1,-1,+1, +1,-1,-1,+1, +1,-1,-1,+1,+1,-1,-1,+1, +1,-1,-1,+1, +1,-1,-1,+1]
特征序列六：[-1,+1,+1,-1, -1,+1,+1,-1, -1,+1,+1,-1, -1,+1,+1,-1,-1,+1,+1,-1, -1,+1,+1,-1, -1,+1,+1,-1, -1,+1,+1,-1, -1,+1,+1,-1, -1,+1,+1,-1,-1,+1,+1,-1, -1,+1,+1,-1]
特征序列五中子载波序号模4余二和模4余三的为-1，其余为+1，特征序列六中子载波序号模4余二和模4余三为+1，其余为-1。
特征序列七：[-1,-1,-1,+1, -1,-1,-1,+1, -1,-1,-1,+1, -1,-1,-1,+1,-1,-1,-1,+1, -1,-1,-1,+1, -1,-1,-1,+1, -1,-1,-1,+1, -1,-1,-1,+1,-1,-1,-1,+1, -1,-1,-1,+1, -1,-1,-1,+1]
特征序列八：[+1,+1,+1,-1, +1,+1,+1,-1, +1,+1,+1,-1,+1,+1,+1,-1, +1,+1,+1,-1, +1,+1,+1,-1, +1,+1,+1,-1, +1,+1,+1,-1,+1,+1,+1,-1, +1,+1,+1,-1, +1,+1,+1,-1, +1,+1,+1,-1]
特征序列七中子载波序号模4余一、二和三的为+1，其余为-1。特征 序列八中子载波序号模4余一、二和三的为-1，其余为+1。
特征序列九：[-1,-1,+1,-1, -1,-1,+1,-1, -1,-1,+1,-1, -1,-1,+1,-1,-1,-1,+1,-1, -1,-1,+1,-1, -1,-1,+1,-1, -1,-1,+1,-1, -1,-1,+1,-1,-1,-1,+1,-1, -1,-1,+1,-1, -1,-1,+1,-1]
特征序列十：[+1,+1,-1,+1, +1,+1,-1,+1, +1,+1,-1,+1,+1,+1,-1,+1, +1,+1,-1,+1, +1,+1,-1,+1, +1,+1,-1,+1,+1,+1,-1,+1, +1,+1,-1,+1, +1,+1,-1,+1, +1,+1,-1,+1,+1,+1,-1,+1]
特征序列九中子载波序号模4余一、二和四的为-1，其余为+1。特征序列十中子载波序号模4余一、二和四的为+1，其余为-1。
特征序列十一：[-1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,-1,-1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,-1,-1,+1,-1,-1, -1,+1,-1,-1, -1,+1,-1,-1]
特征序列十二 [+1,-1,+1,+1, +1,-1,+1,+1, +1,-1,+1,+1,+1,-1,+1,+1, +1,-1,+1,+1, +1,-1,+1,+1, +1,-1,+1,+1, +1,-1,+1,+1,+1,-1,+1,+1, +1,-1,+1,+1, +1,-1,+1,+1, +1,-1,+1,+1]
特征序列十一中子载波序号模4余一、三和四的为-1，其余为+1。特征序列十二中子载波序号模4余一、三和四的为+1，其余为-1。
特征序列十三：[-1,+1,+1,+1, -1,+1,+1,+1, -1,+1,+1,+1,-1,+1,+1,+1, -1,+1,+1,+1, -1,+1,+1,+1, -1,+1,+1,+1,-1,+1,+1,+1, -1,+1,+1,+1, -1,+1,+1,+1, -1,+1,+1,+1,-1,+1,+1,+1]
特征序列十四 [+1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1,+1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1,+1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1, +1,-1,-1,-1]
特征序列十三中子载波序号模4余二、三和四的为+1，其余为-1。特征序列十四中子载波序号模4余二、三和四的为-1，其余为+1。
特征序列十五：[+1,+1,+1,-1,-1,-1, +1,+1,+1,-1,-1,-1,+1,+1,+1,-1,-1,-1, +1,+1,+1,-1,-1,-1, +1,+1,+1,-1,-1,-1,+1,+1,+1,-1,-1,-1, +1,+1,+1,-1,-1,-1, +1,+1,+1,-1,-1,-1]
特征序列十五中子载波序号，每3个数据子载波分一组，分别给+1， -1交错的结果。
特征序列十六 [-1,-1,-1,+1,+1,+1, -1,-1,-1,+1,+1,+1,-1,-1,-1,+1,+1,+1, -1,-1,-1,+1,+1,+1, -1,-1,-1,+1,+1,+1,-1,-1,-1,+1,+1,+1, -1,-1,-1,+1,+1,+1, -1,-1,-1,+1,+1,+1]
特征序列十六中子载波序号，每3个数据子载波分一组，分别给+1，-1交错的结果。
特征序列十七 [+1,+1,+1,+1,-1,-1,-1,-1, +1,+1,+1,+1,-1,-1,-1,-1,+1,+1,+1,+1,-1,-1,-1,-1, +1,+1,+1,+1,-1,-1,-1,-1, +1,+1,+1,+1,-1,-1,-1,-1,+1,+1,+1,+1,-1,-1,-1,-1]
特征序列十七中子载波序号，每4个数据子载波分一组，分别给+1，-1交错的结果。
特征序列十八 [-1,-1,-1,-1,+1,+1,+1,+1, -1,-1,-1,-1,+1,+1,+1,+1,-1,-1,-1,-1,+1,+1,+1,+1, -1,-1,-1,-1,+1,+1,+1,+1, -1,-1,-1,-1,+1,+1,+1,+1,-1,-1,-1,-1,+1,+1,+1,+1]
特征序列十八中子载波序号，每4个数据子载波分一组，分别给-1，+1交错的结果。
特征序列十九 [+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1]
特征序列十九中子载波序号，每6个数据子载波分一组，分别给+1，-1交错的结果。
特征序列二十 [-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1]
特征序列二十中子载波序号，每6个数据子载波分一组，分别给-1，+1交错的结果。
特征序列二十一：[+1,+1,-1,+1,+1,-1, +1,+1,-1,+1,+1,-1,+1,+1,-1,+1,+1,-1, +1,+1,-1,+1,+1,-1, +1,+1,-1,+1,+1,-1,+1,+1,-1,+1,+1,-1， +1,+1,-1,+1,+1,-1, +1,+1,-1,+1,+1,-1]
特征序列二十一中子载波序号分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值+1，序号除 以3余数为0的分为一组，赋值-1。
特征序列二十二 [-1,-1,+1,-1,-1,+1, -1,-1,+1,-1,-1,+1,-1,-1,+1,-1,-1,+1, -1,-1,+1,-1,-1,+1, -1,-1,+1,-1,-1,+1, -1,-1,+1,-1,-1,+1，-1,-1,+1,-1,-1,+1, -1,-1,+1,-1,-1,+1]
特征序列二十二中子载波序号分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列二十三 [+1,-1,+1,+1,-1,+1, +1,-1,+1,+1,-1,+1,+1,-1,+1,+1,-1,+1, +1,-1,+1,+1,-1,+1, +1,-1,+1,+1,-1,+1,+1,-1,+1,+1,-1,+1， +1,-1,+1,+1,-1,+1, +1,-1,+1,+1,-1,+1]
特征序列二十三中子载波序号分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列二十四 [-1,+1,-1,-1,+1,-1, -1,+1,-1,-1,+1,-1,-1,+1,-1,-1,+1,-1, -1,+1,-1,-1,+1,-1, -1,+1,-1,-1,+1,-1, -1,+1,-1,-1,+1,-1，-1,+1,-1,-1,+1,-1, -1,+1,-1,-1,+1,-1]
特征序列二十四中子载波序号分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列二十五 [+1,-1,-1,+1,-1,-1, +1,-1,-1, +1,-1,-1, +1,-1,-1,+1,-1,-1, +1,-1,-1, +1,-1,-1, +1,-1,-1, +1,-1,-1, +1,-1,-1, +1,-1,-1，+1,-1,-1,+1,-1,-1, +1,-1,-1,+1,-1,-1]
特征序列二十五中子载波序号分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值-1。
特征序列二十六 [-1,+1,+1,-1,+1,+1, -1,+1,+1,-1,+1,+1,-1,+1,+1,-1,+1,+1, -1,+1,+1,-1,+1,+1, -1,+1,+1,-1,+1,+1,-1,+1,+1,-1,+1,+1， -1,+1,+1,-1,+1,+1, -1,+1,+1,-1,+1,+1]
特征序列二十六中子载波序号分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值+1。
特征序列二十七 [+1,+1,+1,+1,-1,-1, +1,+1,+1,+1,-1,-1,+1,+1,+1,+1,-1,-1, +1,+1,+1,+1,-1,-1, +1,+1,+1,+1,-1,-1,+1,+1,+1,+1,-1,-1， +1,+1,+1,+1,-1,-1, +1,+1,+1,+1,-1,-1]
特征序列二十七中子载波每个两个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列二十八 [-1,-1,-1,-1,+1,+1, -1,-1,-1,-1,+1,+1,-1,-1,-1,-1,+1,+1, -1,-1,-1,-1,+1,+1, -1,-1,-1,-1,+1,+1, -1,-1,-1,-1,+1,+1，-1,-1,-1,-1,+1,+1, -1,-1,-1,-1,+1,+1]
特征序列二十八中子载波每个两个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列二十九 [+1,+1,-1,-1,+1,+1, +1,+1,-1,-1,+1,+1,+1,+1,-1,-1,+1,+1, +1,+1,-1,-1,+1,+1, +1,+1,-1,-1,+1,+1,+1,+1,-1,-1,+1,+1， +1,+1,-1,-1,+1,+1, +1,+1,-1,-1,+1,+1]
特征序列二十九中子载波每个两个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列三十 [-1,-1,+1,+1,-1,-1, -1,-1,+1,+1,-1,-1, -1,-1,+1,+1,-1,-1,-1,-1,+1,+1,-1,-1, -1,-1,+1,+1,-1,-1, -1,-1,+1,+1,-1,-1, -1,-1,+1,+1,-1,-1,-1,-1,+1,+1,-1,-1]
特征序列三十中子载波每个两个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列三十一 [+1,+1,-1,-1,-1,-1, +1,+1,-1,-1,-1,-1,+1,+1,-1,-1,-1,-1, +1,+1,-1,-1,-1,-1, +1,+1,-1,-1,-1,-1, +1,+1,-1,-1,-1,-1，+1,+1,-1,-1,-1,-1, +1,+1,-1,-1,-1,-1]
特征序列三十一中子载波每个两个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值-1。
特征序列三十二 [-1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1,-1,-1,+1,+1,+1,+1， -1,-1,+1,+1,+1,+1, -1,-1,+1,+1,+1,+1]
特征序列三十二中子载波每个两个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值+1。
特征序列三十三 [+1,+1,+1,+1, +1,+1,+1,+1, -1,-1,-1,-1,+1,+1,+1,+1, +1,+1,+1,+1, -1,-1,-1,-1, +1,+1,+1,+1, +1,+1,+1,+1,-1,-1,-1,-1, +1,+1,+1,+1, +1,+1,+1,+1, -1,-1,-1,-1]
特征序列三十三中子载波每个4个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列三十四 [-1,-1,-1,-1, -1,-1,-1,-1, +1,+1+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, +1,+1+1,+1, -1,-1,-1,-1, -1,-1,-1,-1, +1,+1+1,+1,-1,-1,-1,-1, -1,-1,-1,-1, +1,+1+1,+1]
特征序列三十四中子载波每个4个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列三十五 [+1,+1,+1,+1, -1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1, +1,+1,+1,+1, +1,+1,+1,+1, -1,-1,-1,-1,+1,+1,+1,+1, +1,+1,+1,+1, -1,-1,-1,-1, +1,+1,+1,+1]
特征序列三十五中子载波每个4个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列三十六 [-1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1, -1,-1,-1,-1,+1,+1,+1,+1, -1,-1,-1,-1, -1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1]
特征序列三十六中子载波每个4个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列三十七 [+1,+1,+1,+1, -1,-1,-1,-1, -1,-1,-1,-1,+1,+1,+1,+1, -1,-1,-1,-1, -1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1, -1,-1,-1,-1, +1,+1,+1,+1, -1,-1,-1,-1, -1,-1,-1,-1]
特征序列三十七中子载波每个4个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值-1。
特征序列三十八 [-1,-1,-1,-1, +1,+1,+1,+1, +1,+1,+1,+1,-1,-1,-1,-1, +1,+1,+1,+1, +1,+1,+1,+1, -1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1, +1,+1,+1,+1, +1,+1,+1,+1]
特征序列三十八中子载波每个4个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值+1。
特征序列三十九 [+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1]
特征序列三十九中子载波每个8个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列四十 [-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,+1,+1+1,+1,+1,+1+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,+1,+1+1,+1,+1,+1+1,+1]
特征序列四十中子载波每个8个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列四十一：[+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1,+1,+1,+1,+1,+1,+1,+1,+1, +1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1,+1,+1,+1,+1,+1,+1,+1,+1]
特征序列四十一中子载波每个8个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列四十二 [-1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1,-1,-1,-1,-1,-1,-1,-1,-1]
特征序列四十二中子载波每个8个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列四十三：[+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1]
特征序列四十三中子载波每个8个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值-1。
特征序列四十四 [-1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1]
特征序列四十四中子载波每个8个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值+1。
特征序列四十五：[+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1]
特征序列四十五中子载波每个16个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值-1。
特征序列四十六 [-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, +1,+1+1,+1,+1,+1+1,+1,+1,+1+1,+1,+1,+1+1,+1]
特征序列四十六中子载波每个16个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列四十七：[+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,+1,+1,+1,+1,+1,+1,+1,+1, +1,+1,+1,+1,+1,+1,+1,+1]
特征序列四十七中子载波每个16个子载波给一个序号，分成3个组， 其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列四十八 [-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,+1,+1,+1,+1,+1,+1,+1,+1, +1,+1,+1,+1,+1,+1,+1,+1,-1,-1,-1,-1,-1,-1,-1,-1, +1,+1,+1,+1,+1,+1,+1,+1]
特征序列四十八中子载波每个16个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值+1。
特征序列四十九：[+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1, -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1]
特征序列四十九中子载波每个16个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值+1，序号除以3余数为2的分为一组，赋值-1，序号除以3余数为0的分为一组，赋值-1。
特征序列五十 [-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,+1,+1,+1,+1,+1,+1,+1,+1, +1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1,+1, +1,+1,+1,+1,+1,+1,+1,+1]
特征序列五十中子载波每个16个子载波给一个序号，分成3个组，其中序号除以3余数为1的分为一组，赋值-1，序号除以3余数为2的分为一组，赋值+1，序号除以3余数为0的分为一组，赋值+1。
其中，特征序列二十一到特征序列五十，可以用于指示三个比特的隐含信息。
方案2：将所述L-SIG之后的第一个OFDM符号中数据子载波的信号分别与两个特征序列相乘，得到第一加扰序列和第二加扰序列，将第一加扰序列和第二加扰序列分别与L-SIG做互相关处理。
可选地，根据所述第一加扰序列与L-SIG做互相关处理的结果确定第一比特信息，根据所述第二加扰序列与L-SIG做互相关处理的结果确定第二比特信息。
具体地，图10示出了方案2中802.11ax物理层分组的比特信息检测方法。802.11ax接收机在接收到一个WLAN物理层分组的L-SIG之后的第一个OFDM符号的时域信号后，把L-SIG和RL-SIG分别去除CP，再通过64 点的快速傅立叶变换(Fast Fourier transform，简称FFT)变换到频域。然后把RL-SIG的数据子载波信号分别乘以特征序列1和特征序列2，得到的结果均乘以L-SIG的数据子载波信号，得到两个相乘的结果，然后把相乘结果进行判决，相乘结果的绝对值较大的那一个对应的特征序列选择为特征序列。接下来，若相乘结果较大的那一个数为正数，则选择的特征序列为最后判决的特征序列，并可以通过该特征序列得到2个比特信息；若相乘结果较大的那一个数为负数，则选择的特征序列全部元素分别乘以-1后的特征序列为最后判决的特征序列，并可以通过该特征序列得到2个比特信息。
具体地，方案2中提到的所述特征序列与方案1中的相同，不再赘述。
本发明实施例在无线局域网的数据检测过程中，将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘，将相乘后的信号与L-SIG做互相关处理，通过上述方式，可以高效地区分11ax物理层分组，避免接收到周期信号导致的误判。
实施例3
相对应的，图11是本发明实施例3的无线局域网中的数据检测装置的示意性框图。该数据传输装置例如为站点，或者实现相关功能的专用电路或者芯片。图11所示的数据传输装置1100包括处理单元1101和收发单元1102。例如，该信道指示装置1100可以为图1中示出的AP或STA1-STA3。实施例3中的站点充当接收机的角色。
收发单元1102，用于接收物理层协议数据单元PPDU；
处理单元1101，用于将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘；
处理单元1101，还用于根据相乘的结果确定所述PPDU携带的信息。
具体地，对于处理单元1101执行的动作，至少包括两种方案。
方案1：处理单元1101将所述相乘的结果分为两组，每一组都包括频域不连续的数据子载波，根据第一组的结果确定第一比特信息，根据第二组的结果确定第二比特信息。
方案2：处理单元将所述L-SIG中的数据子载波分成两组，每一组 都包括频域不连续的数据子载波；
将L-SIG中第一组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘，将L-SIG中第二组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘；
处理单元根据第一组相乘的结果确定第一比特信息，根据第二组相乘的结果确定第二比特信息。
需要说明的是，方法2和方法1的区别在于：方法1先让数据子载波的信号相乘，然后对相乘的结果进行分组，得出2个比特的信息。方法1先对数据子载波进行分组，然后将每一组数据子载波的信号相乘，根据相乘的结果，得出2个比特的信息。
可选地，所述PPDU携带的第一比特信息和第二比特信息用于指示所述PPDU归属的协议版本。所述PPDU携带的信息在前述实施例中已有阐释，不再赘述。
本发明实施例在无线局域网的数据检测过程中，处理单元将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，根据相乘的结果确定所述PPDU携带的信息，通过上述方式，可以高效地区分11ax物理层分组，避免接收到周期信号导致的误判。
实施例4
相对应的，图12是本发明实施例4的无线局域网中的数据检测装置的示意性框图。该数据传输装置例如为站点，或者实现相关功能的专用电路或者芯片。图12所示的数据传输装置1200包括处理单元1201和收发单元1202。例如，该信道指示装置1200可以为图1中示出的AP或STA1-STA3。实施例4中的站点充当接收机的角色。
收发单元1202，用于接收物理层协议数据单元PPDU；
处理单元1201，用于将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘；
所述处理单元1201，还用于将相乘后的信号与L-SIG做互相关处理；
所述处理单元1201，还用于根据所述互相关处理的结果确定所述 PPDU携带的信息。
具体地，对于处理单元1201执行的动作，至少包括两种方案。
方案1：所述L-SIG之后的第一个OFDM符号中数据子载波的信号与所述特征序列相乘。
方案2：所述L-SIG之后的第一个OFDM符号中数据子载波的信号分别与两个特征序列相乘，得到第一加扰序列和第二加扰序列；
第一加扰序列和第二加扰序列分别与L-SIG做互相关处理。
进一步地，方案2中处理单元根据所述第一加扰序列与L-SIG做互相关处理的结果确定第一比特信息，根据所述第二加扰序列与L-SIG做互相关处理的结果确定第二比特信息。
具体地，所述特征序列为+1和-1组成的序列，所述特征序列包括一个比特子序列或多个比特子序列，所述比特子序列包括：[+1 +1 +1 +1]、[+1 +1 -1 -1]、[+1 -1 -1 +1]、[+1 -1 +1 -1]、[-1 -1 -1 -1 ]、[-1 -1 +1 +1]、[-1 +1 +1 -1]或[-1 +1 -1 +1]。
可选地，所述特征序列中数据子载波数目与L-SIG中数据子载波数目相同，所述特征序列中数据子载波数目与L-SIG之后第一个OFDM符号中数据子载波数目相同。
本发明实施例在无线局域网的数据检测过程中，处理单元将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘，将相乘后的信号与L-SIG做互相关处理，通过上述方式，可以高效地区分11ax物理层分组，避免接收到周期信号导致的误判。
实施例5
图13是本发明实施例的数据检测设备的框图。图13的站点1300包括处理器1310、存储器1320、收发器1340。处理单元1310控制站点1300的操作。存储器1320可以包括只读存储器和随机存取存储器，并向处理单元1310提供指令和数据。存储器1320的一部分还可以包括非易失行随机存取存储器(NVRAM)。站点1300的各个组件通过总线系统1330耦合在一起，其中总线系统1330除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统1330。
上述本发明实施例揭示的发送前述各种数据检测的方法可以应用于处理器1310中，或者由处理器1310实现。在实现过程中，上述方法的各步骤可以通过处理器1310中的硬件的集成逻辑电路或者软件形式的指令完成。处理器1310可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本发明实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1320，处理单元1310读取存储器1320中的信息，结合其硬件完成上述方法的步骤。
具体地，存储器1320存储使得处理单元1310执行如下操作的指令：接收物理层协议数据单元PPDU；将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘；根据相乘的结果确定所述PPDU携带的信息。
具体地，存储器1320存储使得处理单元1310还可以执行如下操作的指令：
接收物理层协议数据单元PPDU；将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘；将相乘后的信号与L-SIG做互相关处理；根据所述互相关处理的结果确定所述PPDU携带的信息。
以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (20)

  1. 一种数据检测方法，应用于无线局域网WLAN，其特征在于，包括：
    接收物理层协议数据单元PPDU；
    将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘；
    根据相乘的结果确定所述PPDU携带的信息。
  2. 根据权利要求1所述的方法，其特征在于，所述根据相乘的结果确定所述PPDU携带的信息，包括:将所述相乘的结果分为两组，每一组都包括频域不连续的数据子载波，根据第一组的结果确定第一比特信息，根据第二组的结果确定第二比特信息。
  3. 根据权利要求1所述的方法，其特征在于，所述将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，包括：
    将所述L-SIG中的数据子载波分成两组，每一组都包括频域不连续的数据子载波；
    将L-SIG中第一组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘，将L-SIG中第二组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘；
    所述根据相乘的结果确定所述PPDU携带的信息，包括：根据第一组相乘的结果确定第一比特信息，根据第二组相乘的结果确定第二比特信息。
  4. 根据权利要求2或3所述的方法，其特征在于，所述PPDU携带的第一比特信息和第二比特信息用于指示所述PPDU归属的协议版本。
  5. 一种数据检测方法，应用于无线局域网WLAN，其特征在于，包括：
    接收物理层协议数据单元PPDU；
    将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘；
    将相乘后的信号与L-SIG做互相关处理；
    根据所述互相关处理的结果确定所述PPDU携带的信息。
  6. 根据权利要求5所述的方法，其特征在于，所述将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个特征序列相乘，包括：
    所述L-SIG之后的第一个OFDM符号中数据子载波的信号与所述特征序列相乘。
  7. 根据权利要求5所述的方法，其特征在于，所述特征序列为两个，所述将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与两个特征序列相乘，包括：
    将所述L-SIG之后的第一个OFDM符号中数据子载波的信号分别与两个特征序列相乘，得到第一加扰序列和第二加扰序列；
    所述将相乘后的信号与L-SIG做互相关处理，包括：
    将第一加扰序列和第二加扰序列分别与L-SIG做互相关处理。
  8. 根据权利要求7所述的方法，其特征在于，所述根据所述互相关处理的结果确定所述PPDU携带的信息，包括：根据所述第一加扰序列与L-SIG做互相关处理的结果确定第一比特信息，根据所述第二加扰序列与L-SIG做互相关处理的结果确定第二比特信息。
  9. 根据权利要求5-8任一所述的方法，其特征在于，所述特征序列为+1和-1组成的序列，所述特征序列包括一个比特子序列或多个比特子序列，所述比特子序列包括：[+1+1+1+1]、[+1+1-1-1]、[+1-1-1+1]、[+1-1+1-1]、[-1-1-1-1]、[-1-1+1+1]、[-1+1+1-1]或[-1+1-1+1]。
  10. 根据权利要求5-9任一所述的方法，其特征在于，所述特征序列中数据子载波数目与L-SIG中数据子载波数目相同，所述特征序列中数据子载波数目与L-SIG之后第一个OFDM符号中数据子载波数目相同。
  11. 一种数据检测装置，应用于无线局域网WLAN，其特征在于，包括：
    收发单元，用于接收物理层协议数据单元PPDU；
    处理单元，用于将所述PPDU中传统信令字段L-SIG中数据子载波的 信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘；
    所述处理单元，还用于根据相乘的结果确定所述PPDU携带的信息。
  12. 根据权利要求11所述的装置，其特征在于，所述处理单元根据相乘的结果确定所述PPDU携带的信息，包括:将所述相乘的结果分为两组，每一组都包括频域不连续的数据子载波，根据第一组的结果确定第一比特信息，根据第二组的结果确定第二比特信息。
  13. 根据权利要求11所述的装置，其特征在于，所述处理单元将所述PPDU中传统信令字段L-SIG中数据子载波的信号与所述L-SIG之后的第一个正交频分复用OFDM符号中对应位置数据子载波的信号相乘，包括：
    将所述L-SIG中的数据子载波分成两组，每一组都包括频域不连续的数据子载波；
    将L-SIG中第一组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘，将L-SIG中第二组数据子载波的信号与L-SIG之后的第一个OFDM符号中对应位置的数据子载波的信号相乘；
    所述根据相乘的结果确定所述PPDU携带的信息，包括：根据第一组相乘的结果确定第一比特信息，根据第二组相乘的结果确定第二比特信息。
  14. 根据权利要求12或13所述的装置，其特征在于，所述PPDU携带的第一比特信息和第二比特信息用于指示所述PPDU归属的协议版本。
  15. 一种数据检测装置，应用于无线局域网WLAN，其特征在于，包括：
    收发单元，用于接收物理层协议数据单元PPDU；
    处理单元，用于将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个或多个特征序列相乘；
    所述处理单元，还用于将相乘后的信号与L-SIG做互相关处理；
    所述处理单元，还用于根据所述互相关处理的结果确定所述PPDU携带的信息。
  16. 根据权利要求15所述的装置，其特征在于，所述处理单元将所 述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与一个特征序列相乘，包括：
    所述L-SIG之后的第一个OFDM符号中数据子载波的信号与所述特征序列相乘。
  17. 根据权利要求15所述的装置，其特征在于，所述特征序列为两个，所述处理单元将所述PPDU中传统信令字段L-SIG之后的第一个正交频分复用OFDM符号中数据子载波的信号与两个特征序列相乘，包括：
    将所述L-SIG之后的第一个OFDM符号中数据子载波的信号分别与两个特征序列相乘，得到第一加扰序列和第二加扰序列；
    所述将相乘后的信号与L-SIG做互相关处理，包括：
    将第一加扰序列和第二加扰序列分别与L-SIG做互相关处理。
  18. 根据权利要求17所述的装置，其特征在于，所述处理单元根据所述互相关处理的结果确定所述PPDU携带的信息，包括：根据所述第一加扰序列与L-SIG做互相关处理的结果确定第一比特信息，根据所述第二加扰序列与L-SIG做互相关处理的结果确定第二比特信息。
  19. 根据权利要求15-18任一所述的装置，其特征在于，所述特征序列为+1和-1组成的序列，所述特征序列包括一个比特子序列或多个比特子序列，所述比特子序列包括：[+1+1+1+1]、[+1+1-1-1]、[+1-1-1+1]、[+1-1+1-1]、[-1-1-1-1]、[-1-1+1+1]、[-1+1+1-1]或[-1+1-1+1]。
  20. 根据权利要求15-19任一所述的装置，其特征在于，所述特征序列中数据子载波数目与L-SIG中数据子载波数目相同，所述特征序列中数据子载波数目与L-SIG之后第一个OFDM符号中数据子载波数目相同。
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CN112422230B (zh) * 2019-08-22 2024-05-03 中兴通讯股份有限公司 数据帧检测方法、装置和存储介质

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