WO2016154951A1

WO2016154951A1 - Data transmission method and transmission device

Info

Publication number: WO2016154951A1
Application number: PCT/CN2015/075628
Authority: WO
Inventors: 刘晟
Original assignee: 华为技术有限公司
Priority date: 2015-03-31
Filing date: 2015-03-31
Publication date: 2016-10-06
Also published as: CN107529354B; CN107529354A

Abstract

Embodiments of the present invention provide a data transmission method applied to a wireless local area network (WLAN). The method comprises: generating a physical layer packet, the physical layer packet comprising a traditional signaling field L-SIG and a first orthogonal frequency division multiplexing (OFDM) symbol after the L-SIG, each of the L-SIG and the OFDM symbol comprising a plurality of data subcarriers in a frequency domain, signals on the data subcarriers of the OFDM symbol being obtained by multiplying signals on the data subcarriers in corresponding positions of the L-SIG by elements in corresponding positions of a signature sequence; and sending the physical layer packet comprising the L-SIG and the OFDM symbol. The embodiments of the present invention also provide a corresponding data transmission device. By applying the method and device in the embodiments of the present invention, recognition of a 11ax physical layer packet and enhancement of the detecting performance of the L-SIG can be realized.

Description

一种数据传输方法和传输装置Data transmission method and transmission device

技术领域Technical field

本发明属于通信技术领域，尤其涉及一种数据传输方法和传输装置。The present invention belongs to the field of communications technologies, and in particular, to a data transmission method and a transmission device.

背景技术Background technique

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。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. Currently, 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). 802.11ax standardization work, by introducing OFDMA (Orthogonal Frequency-Division Multiple Access) technology, 802.11ax can further improve the transmission performance of WLAN in dense user scenarios.

然而，现有的WLAN设备，并不能有效区分802.11ax分组，802.11ac分组以及802.11n分组。However, existing WLAN devices cannot effectively distinguish between 802.11ax packets, 802.11ac packets, and 802.11n packets.

发明内容Summary of the invention

有鉴于此，本发明提供一种无线局域网中数据传输方法和装置，用于解决现有的WLAN设备不能有效区分802.11ax分组，802.11ac分组以及802.11n分组的问题。In view of this, the present invention provides a data transmission method and apparatus in a wireless local area network, which is used to solve the problem that an existing WLAN device cannot effectively distinguish an 802.11ax packet, an 802.11ac packet, and an 802.11n packet.

第一方面，本发明实施例提供了一种应用于无线局域网WLAN的数据传输方法，包括：In a first aspect, an embodiment of the present invention provides a data transmission method applied to a WLAN of a wireless local area network, including:

生成物理层分组，所述物理层分组包含传统信令字段L-SIG和所述L-SIG之后的第一个正交频分复用OFDM符号，所述L-SIG和所述OFDM符号在频域上包含多个数据子载波，所述OFDM符号的数据子载波上的信号由所述L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到；Generating a physical layer packet, the physical layer packet including a legacy signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the OFDM symbol in frequency The domain includes a plurality of data subcarriers, and the signal on the data subcarrier of the OFDM symbol is represented by a signal on the data subcarrier corresponding to the position of the L-SIG and a corresponding position of the feature sequence The elements are multiplied to get;

发送所述包含L-SIG和所述OFDM符号的物理层分组。Transmitting the physical layer packet including the L-SIG and the OFDM symbol.

在第一方面的第一种可能的实现方式中，所述L-SIG数据子载波上的信号为二进制相移键控BPSK调制符号。In a first possible implementation of the first aspect, the signal on the L-SIG data subcarrier is a binary phase shift keyed BPSK modulation symbol.

结合第一方面或者第一方面第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述L-SIG和所述OFDM符号的数据子载波的个数为48或52。With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the number of data subcarriers of the L-SIG and the OFDM symbol is 48 or 52.

结合第一方面及其上述实现方式，在第一方面的第三种可能的实现方式中，所述特征序列为+1和-1组成的序列，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。With reference to the first aspect and the foregoing implementation manner, in a third possible implementation manner of the first aspect, the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol. Or a subsequent evolution protocol.

结合第一方面或者第一方面第三种可能的实现方式，在第一方面的第四种可能的实现方式中，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。With reference to the first aspect or the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the length of the feature sequence is the same as the number of data subcarriers of the L-SIG .

第二方面，本发明实施例提供了一种应用于无线局域网WLAN的数据传输方法，包括：In a second aspect, an embodiment of the present invention provides a data transmission method applied to a WLAN of a wireless local area network, including:

接收物理层分组；Receiving physical layer packets;

解析所述物理层分组，具体包括:将所述物理层分组中的传统信令字段L-SIG后的第一个正交频分复用OFDM符号的数据子载波上的信号逐一与特征序列的各个元素相乘，将相乘后得到的信号与L-SIG数据子载波上的信号进行互相关处理；The parsing the physical layer packet includes: respectively, the signal on the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet is one by one and the feature sequence Multiplying each element, and multiplying the obtained signal with the signal on the L-SIG data subcarrier for cross-correlation processing;

确定所述物理层分组的协议版本，具体包括：若互相关处理的结果超过第一门限，则确定所述物理层分组为所述特征序列对应的协议版本的物理层分组。Determining the protocol version of the physical layer packet, specifically, if the result of the cross-correlation processing exceeds the first threshold, determining that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.

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L-SIG和所述L-SIG后的第一个正交频分复用OFDM符号的数据子载波的个数为48或52。With reference to the second aspect, in a first possible implementation manner of the second aspect, the number of data subcarriers of the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG and the L-SIG For 48 or 52.

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+1和-1组成的序列，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。With reference to the second aspect, in a second possible implementation manner of the second aspect, the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol. .

结合第二方面，或者第二方面的第二种可能的实现方式，在第二方面的第三种可能的实现方式中，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。With reference to the second aspect, or the second possible implementation of the second aspect, in a third possible implementation manner of the second aspect, the length of the feature sequence and the data of the L-SIG The number of carriers is the same.

第三方面，本发明实施例提供了一种应用于无线局域网WLAN的数据传输装置，包括：In a third aspect, an embodiment of the present invention provides a data transmission apparatus applied to a WLAN of a wireless local area network, including:

处理单元，用于生成物理层分组，所述物理层分组包含传统信令字段L-SIG和所述L-SIG之后的第一个正交频分复用OFDM符号，所述L-SIG和所述OFDM符号在频域上包含多个数据子载波，所述OFDM符号的数据子载波上的信号由所述L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到；a processing unit, configured to generate a physical layer packet, where the physical layer packet includes a traditional signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the The OFDM symbol includes a plurality of data subcarriers in a frequency domain, and a signal on a data subcarrier of the OFDM symbol is multiplied by a signal on a data subcarrier of the L-SIG corresponding location and an element of a corresponding position of the feature sequence After getting

收发单元，用于发送所述包含L-SIG和所述OFDM符号的物理层分组。结合第三方面，在第三方面的第一种可能的实现方式中，所述处理单元生成的物理层分组中的L-SIG数据子载波上的信号为二进制相移键控BPSK调制符号。And a transceiver unit, configured to send the physical layer packet including the L-SIG and the OFDM symbol. In conjunction with the third aspect, in a first possible implementation manner of the third aspect, the signal on the L-SIG data subcarrier in the physical layer packet generated by the processing unit is a binary phase shift keying BPSK modulation symbol.

结合第三方面以及第三方面第一种可能的实现方式，在第三方面第二种可能的实现方式中，所述处理单元生成的物理层分组中的L-SIG和OFDM符号的数据子载波的个数为48或52。With reference to the third aspect and the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the L-SIG and the data subcarrier of the OFDM symbol in the physical layer packet generated by the processing unit The number is 48 or 52.

结合第三方面及其上述实现方式，在第三方面的第三种可能的实现方式中，所述特征序列为+1和-1组成的序列，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。With reference to the third aspect and the foregoing implementation manner, in a third possible implementation manner of the third aspect, the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol. Or a subsequent evolution protocol.

结合第三方面，或者第三方面的第三种可能的实现方式，在第三方面的第四种可能的实现方式中，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。With reference to the third aspect, or the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the length of the feature sequence and the data subcarrier of the L-SIG The number is the same.

第四方面，本发明实施例提供了一种应用于无线局域网WLAN的数据传输装置，包括：In a fourth aspect, an embodiment of the present invention provides a data transmission apparatus applied to a WLAN of a wireless local area network, including:

收发单元，用于接收物理层分组；a transceiver unit, configured to receive a physical layer packet;

处理单元，用于解析所述物理层分组，具体包括:将所述物理层分组中的传统信令字段L-SIG后的第一个正交频分复用OFDM符号的数据子载波上的信号逐一与特征序列的各个元素相乘，将相乘后得到的信号与L-SIG数据子载波上的信号进行互相关处理；The processing unit, configured to parse the physical layer packet, specifically includes: a signal on a data subcarrier of a first orthogonal frequency division multiplexing OFDM symbol after a traditional signaling field L-SIG in the physical layer packet Multiplying each element of the feature sequence one by one, and multiplying the obtained signal with the signal on the L-SIG data subcarrier;

处理单元，用于确定所述物理层分组的协议版本，具体包括：若互相关处理的结果超过第一门限，则确定所述物理层分组为所述特征序列对应的协议版本的物理层分组。 The processing unit, configured to determine a protocol version of the physical layer packet, specifically includes: if the result of the cross-correlation processing exceeds the first threshold, determining that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.

结合第四方面，在第四方面的第一种可能的实现方式中，所述处理单元解析的数据分组中的L-SIG和所述L-SIG后的第一个正交频分复用OFDM符号的数据子载波的个数为48或52。With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the L-SIG in the data packet parsed by the processing unit and the first orthogonal frequency division multiplexing OFDM after the L-SIG The number of data subcarriers of the symbol is 48 or 52.

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+1和-1组成的序列，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol. .

结合第四方面或者第四方面第二种可能的实现方式，在第四方面的第三种可能的实现方式中，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。With reference to the fourth aspect, or the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the length of the feature sequence is the same as the number of data subcarriers of the L-SIG .

本发明实施例在无线局域网的数据传输过程中，L-SIG后的第一个OFDM符号的数据子载波上的信号由L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到，无论在时域还是频域都不是L-SIG的周期重复，这样就不会受到周期性干扰信号的影响导致误判的问题。同时，对802.11ax以后的版本协议(即后续版本协议)，只需采用与802.11ax特定的特征序列不同的特征序列。优选地，可以采用与802.11ax特定的特征序列互相关小的特征序列，就可以采用相同的方式实现新版本协议的自动检测，解决了不同标准间的兼容性问题。因此，本发明实施例保证11ax物理层分组的识别以及L-SIG检测性能的增强。In the data transmission process of the WLAN in the embodiment of the present invention, the signal on the data subcarrier of the first OFDM symbol after the L-SIG is determined by the signal on the data subcarrier corresponding to the position of the L-SIG and the corresponding position of the feature sequence. After the elements are multiplied, they are not repeated in the time domain or the frequency domain of the L-SIG, so that they are not subject to the misjudgment caused by the periodic interference signals. At the same time, for the later version protocols of 802.11ax (ie, subsequent version protocols), it is only necessary to adopt a feature sequence different from the specific feature sequence of 802.11ax. Preferably, the feature sequence with which the 802.11ax specific feature sequence is cross-correlated can be adopted, and the automatic detection of the new version protocol can be implemented in the same manner, and the compatibility problem between different standards is solved. Therefore, the embodiment of the present invention ensures the identification of the 11ax physical layer packet and the enhancement of the L-SIG detection performance.

附图说明DRAWINGS

图1为本发明实施例的应用场景图。FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.

图2为现有WLAN标准中的物理层分组结构图。2 is a physical layer grouping structure diagram in the existing WLAN standard.

图3为BPSK和QBPSK调制的星座图。Figure 3 is a constellation diagram of BPSK and QBPSK modulation.

图4为802.11ax的物理层分组结构图。4 is a physical layer grouping structure diagram of 802.11ax.

图5为本发明实施例1中的WLAN物理层分组结构图。FIG. 5 is a structural diagram of a WLAN physical layer grouping structure according to Embodiment 1 of the present invention.

图6为本发明实施例1的方法流程图。FIG. 6 is a flowchart of a method according to Embodiment 1 of the present invention.

图7为加扰的RL-SIG字段的生成过程。Figure 7 shows the generation process of the scrambled RL-SIG field.

图8为本发明实施例1中802.11ax物理层分组的自动检测示意图。FIG. 8 is a schematic diagram of automatic detection of an 802.11ax physical layer packet according to Embodiment 1 of the present invention.

图9为本发明实施例2站点的逻辑结构图。FIG. 9 is a logical structural diagram of a station in Embodiment 2 of the present invention.

图10为本发明实施例3站点的逻辑结构图。FIG. 10 is a logical structural diagram of a station in Embodiment 3 of the present invention.

图11为本发明实施例4发送站点的物理结构图。 FIG. 11 is a physical structural diagram of a transmitting station according to Embodiment 4 of the present invention.

图12为本发明实施例4接收站点的物理结构图。Figure 12 is a diagram showing the physical structure of a receiving station according to Embodiment 4 of the present invention.

具体实施方式detailed description

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。但是本领域技术人员应该理解，本发明可以无需这些具体细节实现。在其他实例中，不详细描述公知的方法、过程、组件和电路等，以免造成实施例不必要地模糊。显然，以下所描述的实施例是本发明一部分实施例，而不是全部的实施例。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。In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the embodiments of the present invention are further described in detail below. In order to fully understand the invention, numerous specific details are recited in the following detailed description. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, etc. are not described in detail to avoid unnecessarily obscuring the embodiments. It is apparent that the embodiments described below are part of the embodiments of the invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

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。The embodiments of the present invention can be applied to a WLAN. Currently, 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.

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。Access point class sites, also known as wireless access points or hotspots. The AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. 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. Specifically, the AP may be a terminal device or a network device with a WiFi (English: Wireless Fidelity) chip. Optionally, 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.

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。Non-access point class site (English: None Access Point Station, referred to as Non-AP STA), which may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example: 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, and vehicle communication supporting WiFi communication function Devices and computers that support WiFi communication. Optionally, 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.

图1为一个典型的WLAN部署场景的***示意图，包括一个AP和3个STA，AP分别与STA1、STA2和STA3进行通信。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.

为了更好地理解802.11ax的物理层分组结构，图2给出了现有技术中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(英文：Legacy Preamble)，即由传统短训练字段(英文：Legacy Short Training field，简称L-STF)、传统长训练字段(英文：Legacy Long Training field，简称L-LTF)和传统信令字段(英文：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(英文：High Throughput Signal field，简称HT-SIG)、高吞吐量短训练字段(英文：High Throughput Short Training field，简称HT-STF)和高吞吐量长训练字段(英文：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(英文：Very High Throughput Signal-A field，简称VHT-SIG-A)、极高吞吐量短训练字段(英文：Very High Throughput Short Training field，简称VHT-STF)、极高吞吐量长训练字段(英文：Very High Throughput Long Training field，简称VHT-LTF)和极高吞吐量信令B字段(英文：Very High Throughput Signal-B field，简称VHT-SIG-B)组成。In order to better understand the physical layer packet structure of 802.11ax, FIG. 2 shows the physical layer grouping structures of 802.11a, 802.11n and 802.11ac in the prior art, wherein the first part of them is the traditional preamble (English: Legacy Preamble), which is a traditional short training field (L-STF), a traditional long training field (L-LTF) and a traditional signaling field (English: Legacy) A field consisting of a Signal field (L-SIG for short). The 802.11a physical layer packet is the data field after the traditional preamble, and the 802.11n and 802.11ac physical layer packets are between the traditional preamble and the data field, and a protocol-specific preamble is added. The protocol specific preamble of the 802.11n physical layer packet is composed of a high throughput signaling field (English: High Throughput Signal Field, HT-SIG) and a high throughput short training field (English: High Throughput Short Training Field, HT- STF) and High Throughput Long Training Field (HT-LTF); the protocol-specific preamble of the 802.11ac physical layer packet consists of Very High Throughput Signaling A field (English: Very High Throughput Signal) -A field (VHT-SIG-A for short), Very High Throughput Short Training Field (VHT-STF), Very High Throughput Long Training Field (English: Very High Throughput Long Training) Field (VHT-LTF for short) and Very High Throughput Signaling B field (English: Very High Throughput Signal-B field, VHT-SIG-B for short).

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(英文：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(英文：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(英文：Binary Phase Shift Keying，简称BPSK)星座图旋转了90度，BPSK和QBPSK调制的星座图如图3所示，其中图3左边的附图为BPSK调制，图3右边的附图为QBPSK调制。In the WLAN standard based on OFDM technology such as 802.11a, 802.11n, and 802.11ac, the basic constituent unit of each physical layer packet is an OFDM symbol, and each OFDM symbol includes a cyclic prefix (English: Cyclic Prefix, CP for short). 4 microseconds, typically, the cyclic prefix length is 0.8 microseconds. As shown in Figure 2, the L-SIG has only one OFDM symbol, the HT-SIG. And VHT-SIG-A each includes two OFDM symbols, each OFDM symbol includes 64 subcarriers in the frequency domain, wherein there are 48 data subcarriers for carrying modulation symbols of corresponding physical layer control information. In 802.11n, 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 The binary phase shift keying (English: Binary Phase Shift Keying, BPSK for short) constellation is rotated by 90 degrees. The constellation diagrams of BPSK and QBPSK modulation are shown in Fig. 3. The figure on the left of Fig. 3 is BPSK modulation. 3 The drawing on the right is QBPSK modulation.

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。Since 802.11a does not use QBPSK modulation for two OFDM symbols after L-SIG, 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. In 802.11ac, 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. Whether 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.

图4示出了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(英文：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。Figure 4 shows the physical layer packet structure of 802.11ax. The initial part is also the traditional preamble, that is, the field consisting of L-STF, L-LTF and L-SIG, and finally the data field, the traditional preamble and the data field. The preamble of the 802.11ax protocol is the HEW preamble. The first field of the HEW preamble is the High Efficiency Signal-A field (HE-SIG-A). The HE-SIG-A consists of At least one OFDM symbol having a length of 4 microseconds, between the L-SIG and the HE-SIG-A, the first OFDM symbol after the L-SIG is an OFDM symbol having a length of 4 microseconds, after the L-SIG The second OFDM symbol is the first OFDM symbol of HE-SIG-A.

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，现有技术中已提出了两种不同的解决方案。In order to implement automatic detection of 802.11ax physical layer packets, firstly, 802.11n or 802.11ac receivers should be avoided to misidentify 802.11ax physical layer packets as 802.11n or 802.11ac. The physical layer is grouped. For this reason, the first and second OFDM symbols after the 802.11ax physical layer packet L-SIG are BPSK modulated, as shown in FIG. At the same time, in order to enable the 802.11ax receiver to correctly identify the physical layer packets of 802.11ax and reduce the probability of false positives, two different solutions have been proposed in the prior art.

如前所述，L-SIG的长度为一个OFDM符号，在第一个现有方案中，L-SIG之后的第一个OFDM符号即为L-SIG的重复，即L-SIG之后的第一个OFDM符号与L-SIG的OFDM符号相同，称为RL-SIG(英文：Repeated L-SIG)。802.11ax的接收机根据这个重复的特征，就能正确识别802.11ax的物理层分组，同时，由于RL-SIG是L-SIG的重复，因此接收机可以将这两个OFDM符号的数据子载波上的信号进行合并，从而获得3dB的信号噪声功率比(英文：Signal to Noise Ratio，简称SNR)的增益，提高L-SIG传输的可靠性。As mentioned above, the length of the L-SIG is one OFDM symbol. In the first prior scheme, the first OFDM symbol after the L-SIG is the repetition of the L-SIG, that is, the first after the L-SIG. The OFDM symbols are the same as the OFDM symbols of the L-SIG, and are called RL-SIG (English: Repeated L-SIG). According to this repetitive feature, the 802.11ax receiver can correctly identify the physical layer packet of 802.11ax. At the same time, since the RL-SIG is a repetition of the L-SIG, the receiver can transmit the data subcarriers of the two OFDM symbols. The signals are combined to obtain a gain of 3dB signal to noise ratio (SNR), which improves the reliability of L-SIG transmission.

第二个现有方案中L-SIG之后的第一个OFDM符号为签名符号(英文：Signature Symbol)，在该OFDM符号所承载的信息比特中，包含一个802.11ax的签名序列用于标识802.11ax的物理层分组，例如，若该OFDM符号包含48个数据子载波，若采用编码速率为1/2的卷积编码，因为每个数据子载波承载BPSK调制符号，因此可传输48×1/2＝24个比特，扣除卷积编码产生的6个尾比特一共可以传输18个信息比特，可以用一个长度为10比特的签名序列来标识802.11ax的物理层分组。因此非802.11ax的物理层分组正好在L-SIG之后的第一个OFDM符号中传输该签名序列的概率为1/2¹⁰≈0.1％，采用更长(不超过18比特)的签名序列还可以进一步降低将非802.11ax的物理层分组误判为802.11ax的物理层分组的概率。In the second prior scheme, the first OFDM symbol after the L-SIG is a signature symbol (English: Signature Symbol), and an information bit carried by the OFDM symbol includes an 802.11ax signature sequence for identifying 802.11ax. Physical layer grouping, for example, if the OFDM symbol contains 48 data subcarriers, if a convolutional coding rate of 1/2 is used, since each data subcarrier carries a BPSK modulation symbol, it can transmit 48×1/2 = 24 bits, a total of 18 information bits can be transmitted by subtracting 6 tail bits generated by convolutional coding, and a 10-bit length signature sequence can be used to identify the physical layer packet of 802.11ax. Therefore, the probability that the non-802.11ax physical layer packet transmits the signature sequence in the first OFDM symbol after the L-SIG is 1/2 ¹⁰ ≈ 0.1%, and a longer (no more than 18 bits) signature sequence can be used. The probability of misinterpreting the physical layer packet of the non-802.11ax as the physical layer packet of 802.11ax is further reduced.

但是，现有技术的两个方案均存在一定的问题。其中，第一个现有方案的主要问题在于：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，第一个现有方案利用RL-SIG与L-SIG的重复特征容易受到周期性的干扰信号的影响，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，第一个现有方案未考虑对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，相比之下，第二个现有方案中只需为新版本协议分配一个与802.11ax不同的签名序列就能区别802.11ax和新版本协议。但是，与第一个现有方案相比，第二个现有方案无法获得L-SIG与RL-SIG合并带来的SNR增益，无法保证L-SIG在室外和低SNR下的可靠传输。However, both solutions of the prior art have certain problems. Among them, the main problem of the first existing solution is that the 5 GHz band where the WLAN is located is an unlicensed spectrum, and other devices except the WLAN may use the frequency band, or the out-of-band leakage of other wireless devices may enter the frequency band, and these A lot of interference signals have periodicity. The first existing scheme utilizes the repeated features of RL-SIG and L-SIG to be susceptible to periodic interference signals, thereby increasing the misjudgment of non-802.11ax physical layer packets to 802.11ax. The risk of physical layer grouping; in addition, the first existing solution does not consider the support of the new version of the protocol after 802.11ax, that is, the new version of the protocol needs to redesign a new way to carry out the physical layer grouping of the new version of the protocol. Automatic detection, in contrast, the second existing solution only needs to assign a different signature sequence to 802.11ax for the new version of the protocol to distinguish between 802.11ax and the new version. However, compared with the first existing solution, the second existing solution cannot obtain the SNR gain brought by the combination of L-SIG and RL-SIG, and cannot guarantee the reliable transmission of L-SIG at outdoor and low SNR.

实施例1Example 1

本发明实施例1提供了一种应用于WLAN中的数据传输方法，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是该数据传输方法的交互图，具体步骤如下： Embodiment 1 of the present invention provides a data transmission 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 an interaction diagram of the data transmission method, and the specific steps are as follows:

步骤1：生成物理层分组，所述物理层分组包含传统信令字段L-SIG和所述L-SIG之后的第一个正交频分复用OFDM符号，所述L-SIG和所述OFDM符号在频域上包含多个数据子载波，所述OFDM符号的数据子载波上的信号由所述L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到。Step 1: Generate a physical layer packet, where the physical layer packet includes a legacy signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the OFDM The symbol includes a plurality of data subcarriers in a frequency domain, and the signal on the data subcarrier of the OFDM symbol is obtained by multiplying a signal on a data subcarrier corresponding to the position of the L-SIG by an element of a corresponding position of the feature sequence. .

步骤2：发送物理层分组，第一站点发送所述包含L-SIG和所述OFDM符号的物理层分组。Step 2: Send a physical layer packet, and the first station sends the physical layer packet including the L-SIG and the OFDM symbol.

步骤3：接收物理层分组。Step 3: Receive physical layer packets.

步骤4：解析物理层分组，具体包括:将所述物理层分组中的传统信令字段L-SIG后的第一个正交频分复用OFDM符号的数据子载波上的信号逐一与特征序列的各个元素相乘，将相乘后得到的信号与L-SIG数据子载波上的信号进行互相关处理。Step 4: Parsing the physical layer packet, specifically, including: respectively, the signal on the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet Each element is multiplied, and the signal obtained by multiplying is correlated with the signal on the L-SIG data subcarrier.

步骤5：确定物理层分组的协议版本，具体包括：若互相关处理的结果超过第一门限，则第二站点确定所述物理层分组为所述特征序列对应的协议版本的物理层分组。Step 5: Determine a protocol version of the physical layer packet, specifically, if the result of the cross-correlation processing exceeds the first threshold, the second station determines that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.

需要说明的是，步骤104中的互相关处理为信号处理中的常用手段，是用来确定两个信号之间相似性的一种信号处理方法。步骤105中的第一门限，由误判概率和漏报概率的折中来确定，例如，若互相关最大值为1，该门限可以取为0.95。It should be noted that the cross-correlation processing in step 104 is a common method in signal processing, and is a signal processing method for determining the similarity between two signals. The first threshold in step 105 is determined by a compromise between the false positive probability and the false negative probability. For example, if the cross correlation maximum is 1, the threshold may be taken as 0.95.

需要说明的是，本发明提出的一种可能的符合下一代WLAN协议(如 802.11ax)的物理层分组结构如图5所示，其最开始的部分是传统前导，即由L-STF、L-LTF和L-SIG组成的字段，L-SIG之后为L-SIG之后的第一个OFDM符号，我们称为加扰的RL-SIG字段，该字段是一个长度为4微秒其中CP为0.8微秒的OFDM符号。其中，该加扰的RL-SIG字段采用本发明实施方式，附加了协议版本特定的标签，同时所传输的信息比特与L-SIG所传输的信息比特相同，并且其数据子载波上承载的调制符号采用BPSK调制。该加扰的RL-SIG字段之后为该下一代WLAN协议版本特定的前导，该前导的最前面是一个长度为4微秒CP为0.8微秒的OFDM符号(即为L-SIG之后的第二个OFDM符号)，并且该OFDM符号的数据子载波上承载的调制符号也采用BPSK调制。该下一代WLAN协议版本特定的前导之后为数据字段。It should be noted that the present invention proposes a possible compliance with the next generation WLAN protocol (eg, The physical layer packet structure of 802.11ax) is shown in Figure 5. The initial part is the traditional preamble, that is, the field consisting of L-STF, L-LTF, and L-SIG. After L-SIG is followed by L-SIG. The first OFDM symbol, which we call the scrambled RL-SIG field, is an OFDM symbol of length 4 microseconds with a CP of 0.8 microseconds. Wherein, the scrambled RL-SIG field adopts an embodiment of the present invention, and a protocol version-specific label is added, and the transmitted information bits are the same as the information bits transmitted by the L-SIG, and the modulation carried on the data subcarriers thereof The symbols are BPSK modulated. The scrambled RL-SIG field is followed by the next-generation WLAN protocol version-specific preamble, the foremost being a OFDM symbol having a length of 4 microseconds CP of 0.8 microseconds (ie, the second after the L-SIG) OFDM symbols), and the modulation symbols carried on the data subcarriers of the OFDM symbol are also BPSK modulated. The next-generation WLAN protocol version-specific preamble is followed by a data field.

需要说明的是，步骤101中第一站点生成物理层分组中L-SIG后的第一个OFDM符号(即加扰的RL-SIG)的过程如图7所示。It should be noted that the process of the first station generating the first OFDM symbol (ie, the scrambled RL-SIG) after the L-SIG in the physical layer packet in step 101 is as shown in FIG. 7.

可选地，所述L-SIG数据子载波上的信号为二进制相移键控BPSK调制符号，所述L-SIG和所述OFDM符号的数据子载波的个数为48或52。Optionally, the signal on the L-SIG data subcarrier is a binary phase shift keyed BPSK modulation symbol, and the number of data subcarriers of the L-SIG and the OFDM symbol is 48 or 52.

可选地，所述特征序列为+1和-1组成的序列，所述特征序列对应的协议版本包括802.11ax协议或后续的演进协议。Optionally, the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence includes an 802.11ax protocol or a subsequent evolved protocol.

可选地，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。Optionally, the length of the feature sequence is the same as the number of data subcarriers of the L-SIG.

具体来说，物理层分组中加扰的RL-SIG的生成过程包括以下步骤。Specifically, the process of generating the scrambled RL-SIG in the physical layer packet includes the following steps.

步骤a：L-SIG的信息比特首先进行信道编码，典型地采用编码速率为1/2的卷积编码。Step a: The information bits of the L-SIG are first channel coded, typically using a convolutional coding rate of 1/2.

步骤b：编码后的比特序列顺序经BPSK星座映射模块生成K个BPSK调制符号并分别对应K个数据子载波，典型地K＝48或52，当K＝48时，扣除6比特的尾比特后L-SIG的信息比特长度为48/2-6＝18比特，当K＝52时，扣除6比特的尾比特后L-SIG的信息比特长度为52/2-6＝20比特。Step b: The encoded bit sequence is sequentially generated by the BPSK constellation mapping module to generate K BPSK modulation symbols and respectively corresponding to K data subcarriers, typically K=48 or 52. When K=48, after deducting 6 bits of tail bits The information bit length of the L-SIG is 48/2-6=18 bits. When K=52, the information bit length of the L-SIG is 52/2-6=20 bits after deducting the 6-bit tail bits.

步骤c-1：所述生成的K个BPSK调制符号直接通过64点的快速傅立叶反变换(英文：Inverse Fast Fourier transform，简称IFFT)形成长度为3.2微秒的时域信号，然后添加0.8微秒的CP，即生成长度为4微秒的L-SIG字段。Step c-1: The generated K BPSK modulation symbols are directly formed into a time domain signal having a length of 3.2 microseconds by a 64-point inverse inverse Fourier transform (IFFT), and then 0.8 microseconds is added. The CP, that is, generates an L-SIG field of length 4 microseconds.

步骤c-2：将所述生成的K个BPSK调制符号中的L(L≤K)个，分别与一个长度为L的协议版本特定的特征序列的各个元素相乘，其中，该特征序列的各个元素为+1或者-1，然后再通过64点的IFFT形成长度为3.2微秒的时域信号，添加0.8微秒的CP后即生成长度为4微秒的加扰的RL-SIG字段。Step c-2: L (L ≤ K) of the generated K BPSK modulation symbols, respectively Multiplying with each element of a protocol version-specific feature sequence of length L, wherein each element of the feature sequence is +1 or -1, and then forming a time domain signal of 3.2 microseconds in length by 64-point IFFT After adding a CP of 0.8 microseconds, a scrambled RL-SIG field of length 4 microseconds is generated.

需要说明的是，步骤104和105中第二站点解析物理层分组以及确定物理层分组的协议版本的过程如图8所示，具体来说，步骤如下：It should be noted that the process of parsing the physical layer grouping and determining the protocol version of the physical layer grouping in the second station in steps 104 and 105 is as shown in FIG. 8. Specifically, the steps are as follows:

步骤a：第二站点在接收到一个WLAN物理层分组的L-SIG之后的第一个OFDM符号的时域信号后，去除CP，通过64点的快速傅立叶变换(英文：Fast Fourier transform，简称FFT)变换到频域。Step a: After receiving the time domain signal of the first OFDM symbol after the L-SIG of the WLAN physical layer packet, the second station removes the CP and passes the 64-point fast Fourier transform (English: Fast Fourier transform, FFT for short) ) Transform to the frequency domain.

步骤b：用802.11ax特定的特征序列的各个元素分别与相应的L个数据子载波上的信号相乘。Step b: Multiplying each element of the 802.11ax specific feature sequence with the signal on the corresponding L data subcarriers.

步骤c：用该OFDM符号的K个数据子载波上的信号与L-SIG的K个数据子载波上的信号进行重复检测，即判断该OFDM符号的K个数据子载波上的信号与L-SIG的K个数据子载波上的信号是否相同，若成功则确定该物理层分组是802.11ax的物理层分组。典型地，重复检测可以通过互相关处理来实现，即将该OFDM符号的K个数据子载波上的信号与L-SIG的K个数据子载波上的信号进行互相关，若互相关处理的结果超过预定的门限，则第二站点判定所述物理层分组是802.11ax的物理层分组。同时，将该OFDM符号的K个数据子载波上的信号与L-SIG的K个数据子载波上的信号进行合并后，再进行BPSK解调和信道解码，得到L-SIG的信息比特。Step c: repeatedly detecting the signals on the K data subcarriers of the OFDM symbol and the signals on the K data subcarriers of the L-SIG, that is, determining the signals on the K data subcarriers of the OFDM symbol and the L- Whether the signals on the K data subcarriers of the SIG are the same, and if successful, it is determined that the physical layer packet is a physical layer packet of 802.11ax. Typically, the repeated detection may be implemented by cross-correlation processing, that is, the signals on the K data subcarriers of the OFDM symbol are cross-correlated with the signals on the K data subcarriers of the L-SIG, if the result of the cross correlation processing exceeds The predetermined threshold, the second station determines that the physical layer packet is a physical layer packet of 802.11ax. At the same time, the signals on the K data subcarriers of the OFDM symbol are combined with the signals on the K data subcarriers of the L-SIG, and then BPSK demodulation and channel decoding are performed to obtain information bits of the L-SIG.

需要说明的是，因为BPSK符号要么为+1、要么为-1，而所述协议版本特定的特征序列由+1和-1组成，因此，所述生成的K个BPSK调制符号中的L个分别与所述协议版本特定的特征序列的各个元素相乘后的信号仍然是BPSK调制的，这样，在图5所示的物理层分组结构中，L-SIG之后的第一个OFDM符号(即加扰的RL-SIG)的数据子载波上承载的调制符号仍然是BPSK调制的，而L-SIG之后的第二个OFDM符号(即协议版本特定的前导的第一个OFDM符号)的数据子载波上承载的调制符号也采用BPSK调制，因此可以避免802.11n或802.11ac的接收机将该物理层分组误判为802.11n或802.11ac的物理层分组。It should be noted that, because the BPSK symbol is either +1 or -1, and the protocol version-specific feature sequence is composed of +1 and -1, therefore, L of the generated K BPSK modulation symbols The signals respectively multiplied by the respective elements of the protocol version-specific feature sequence are still BPSK-modulated, such that in the physical layer packet structure shown in FIG. 5, the first OFDM symbol after the L-SIG (ie, The modulation symbol carried on the data subcarrier of the scrambled RL-SIG) is still BPSK modulated, and the data of the second OFDM symbol after the L-SIG (ie the first OFDM symbol of the protocol version-specific preamble) The modulation symbols carried on the carrier are also BPSK modulated, so that the 802.11n or 802.11ac receiver can be prevented from misjudge the physical layer packet as a physical layer packet of 802.11n or 802.11ac.

需要说明的是，本发明实施例中第一站点充当发射机的角色，第二站点充当接收机的角色。第一站点和第二站点皆可以为WLAN的接入点AP或站点STA。It should be noted that, in the embodiment of the present invention, the first site functions as a transmitter, and the second The site acts as a receiver. Both the first site and the second site may be access point APs or site STAs of the WLAN.

实施例2Example 2

相对应的，图9是本发明实施例2的无线局域网中的数据传输装置的示意性框图。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9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2中的站点充当发送机的角色。Correspondingly, FIG. 9 is a schematic block diagram of a data transmission apparatus in a wireless local area network according to Embodiment 2 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. 9 includes a processing unit 1101 and a transceiver unit 1102. For example, the channel indication device 1100 may be the AP or STA1-STA3 shown in FIG. 1. The site in Embodiment 2 acts as a sender.

处理单元1101，用于生成物理层分组，所述物理层分组包含传统信令字段L-SIG和所述L-SIG之后的第一个正交频分复用OFDM符号，所述L-SIG和所述OFDM符号在频域上包含多个数据子载波，所述OFDM符号的数据子载波上的信号由所述L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到；The processing unit 1101 is configured to generate a physical layer packet, where the physical layer packet includes a traditional signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and The OFDM symbol includes a plurality of data subcarriers in a frequency domain, and a signal on a data subcarrier of the OFDM symbol is caused by a signal on a data subcarrier corresponding to the position of the L-SIG and an element of a corresponding position of the feature sequence. Obtained after multiplication;

收发单元1102，用于发送所述包含L-SIG和所述OFDM符号的物理层分组。The transceiver unit 1102 is configured to send the physical layer packet including the L-SIG and the OFDM symbol.

可选地，所述处理单元生成的物理层分组中的L-SIG数据子载波上的信号为二进制相移键控BPSK调制符号。Optionally, the signal on the L-SIG data subcarrier in the physical layer packet generated by the processing unit is a binary phase shift keying BPSK modulation symbol.

可选地，所述处理单元生成的物理层分组中的L-SIG和OFDM符号的数据子载波的个数为48或52。Optionally, the number of data subcarriers of the L-SIG and the OFDM symbol in the physical layer packet generated by the processing unit is 48 or 52.

可选地，所述特征序列为+1和-1组成的序列，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。 Optionally, the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.

本发明实施例在无线局域网的数据传输过程中，处理单元将L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到L-SIG后的第一个OFDM符号的数据子载波上的信号，通过上述方式，无论在时域还是频域都不是L-SIG的周期重复，这样就不会受到周期性干扰信号的影响导致误判的问题。同时，对802.11ax以后的版本协议(即后续版本协议)，只需采用与802.11ax特定的特征序列不同的特征序列。优选地，可以采用与802.11ax特定的特征序列互相关小的特征序列，就可以采用相同的方式实现新版本协议的自动检测，解决了不同标准间的兼容性问题。因此，本发明实施例保证11ax物理层分组的识别以及L-SIG检测性能的增强。In the data transmission process of the wireless local area network, the processing unit multiplies the signal on the data subcarrier corresponding to the L-SIG corresponding position with the element of the corresponding position of the feature sequence to obtain the first OFDM symbol after the L-SIG. In the above manner, the signal on the data subcarrier is not repeated in the time domain or the frequency domain of the L-SIG, so that it is not affected by the periodic interference signal and causes misjudgment. At the same time, for the later version protocols of 802.11ax (ie, subsequent version protocols), it is only necessary to adopt a feature sequence different from the specific feature sequence of 802.11ax. Preferably, the feature sequence with which the 802.11ax specific feature sequence is cross-correlated can be adopted, and the automatic detection of the new version protocol can be implemented in the same manner, and the compatibility problem between different standards is solved. Therefore, the embodiment of the present invention ensures the identification of the 11ax physical layer packet and the enhancement of the L-SIG detection performance.

实施例3Example 3

相对应的，图10是本发明实施例3的无线局域网中的数据传输装置的示意性框图。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10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3中的站点充当接收机的角色。Correspondingly, FIG. 10 is a schematic block diagram of a data transmission 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 1200 shown in FIG. 10 includes a processing unit 1201 and a transceiver unit 1202. For example, the channel indication device 1200 can be the AP or STA1-STA3 shown in FIG. The station in Embodiment 3 acts as a receiver.

收发单元1201，用于接收物理层分组；The transceiver unit 1201 is configured to receive a physical layer packet.

处理单元1202，用于解析所述物理层分组，具体包括:将所述物理层分组中的传统信令字段L-SIG后的第一个正交频分复用OFDM符号的数据子载波上的信号逐一与特征序列的各个元素相乘，将相乘后得到的信号与L-SIG数据子载波上的信号进行互相关处理；The processing unit 1202 is configured to parse the physical layer packet, and specifically includes: on a data subcarrier of a first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet The signals are multiplied one by one with each element of the feature sequence, and the multiplied signal is cross-correlated with the signal on the L-SIG data subcarrier;

处理单元1202，用于确定所述物理层分组的协议版本，具体包括：若互相关处理的结果超过第一门限，则确定所述物理层分组为所述特征序列对应的协议版本的物理层分组。The processing unit 1202 is configured to determine a protocol version of the physical layer packet, where the method includes: determining, if the result of the cross-correlation processing exceeds the first threshold, the physical layer grouping as a physical layer grouping of a protocol version corresponding to the feature sequence .

可选地，所述处理单元解析的数据分组中的L-SIG和所述L-SIG后的第一个正交频分复用OFDM符号的数据子载波的个数为48或52。Optionally, the number of data subcarriers of the L-SIG in the data packet parsed by the processing unit and the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG is 48 or 52.

可选地，所述特征序列为+1和-1组成的序列，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。Optionally, the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.

可选地，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。Optionally, the length of the feature sequence is different from the number of data subcarriers of the L-SIG with.

本发明实施例在无线局域网的数据传输过程中，处理单元将收发单元接收到的物理层分组中的传统信令字段L-SIG后的第一个正交频分复用OFDM符号的数据子载波上的信号逐一与特征序列的各个元素相乘，将相乘后得到的信号与L-SIG数据子载波上的信号进行互相关处理；若互相关处理的结果超过第一门限，则确定物理层分组为特征序列对应的协议版本的物理层分组。通过上述方式，保证了11ax物理层分组的识别以及L-SIG检测性能的增强。In the data transmission process of the wireless local area network, the processing unit uses the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet received by the transceiver unit. The upper signal is multiplied by each element of the feature sequence one by one, and the multiplied signal is cross-correlated with the signal on the L-SIG data subcarrier; if the cross correlation processing result exceeds the first threshold, the physical layer is determined Grouped into physical layer packets of the protocol version corresponding to the feature sequence. In the above manner, the identification of the 11ax physical layer packet and the enhancement of the L-SIG detection performance are guaranteed.

实施例4Example 4

相应的，另一实施方式提供了一种数据传输装置，包含处理器，用于生成或者处理(发送或者接收)一种新的11ax物理层分组(如图5所示)。具体的传输方法，可以参考前述各实施方式中所述的方法(如图6所示)，此处不再赘述。处理器可以是通用处理器、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。容易理解的，上述资源指示的处理装置，当具体为发送该包含资源指示字段的帧时，可以位于接入点；当具体为接收该包含资源指示字段的帧时，可以位于站点。Accordingly, another embodiment provides a data transmission apparatus including a processor for generating or processing (transmitting or receiving) a new 11ax physical layer packet (as shown in FIG. 5). For the specific transmission method, refer to the method described in the foregoing embodiments (as shown in FIG. 6), and details are not described herein again. The processor may 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, or may implement or perform the embodiments of the present invention. Various methods, steps, and logic blocks are disclosed. 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. It is easy to understand that the processing device of the foregoing resource indication may be located at an access point when specifically transmitting the frame including the resource indication field, and may be located at the site when specifically receiving the frame including the resource indication field.

图11是本发明另一实施例的发送站点的框图。图11的发送点包括接口101、处理单元102和存储器103。处理单元102控制发送站点100的操作。存储器103可以包括只读存储器和随机存取存储器，并向处理单元102提供指令和数据。存储器103的一部分还可以包括非易失行随机存取存储器(NVRAM)。发送站点100的各个组件通过总线***109耦合在一起，其中总线***109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***109。11 is a block diagram of a transmitting station in accordance with another embodiment of the present invention. The transmission point of FIG. 11 includes an interface 101, a processing unit 102, and a memory 103. Processing unit 102 controls the operation of transmitting station 100. Memory 103 can include read only memory and random access memory and provides instructions and data to processing unit 102. A portion of the memory 103 may also include non-volatile line random access memory (NVRAM). The various components of the transmitting site 100 are coupled together by a bus system 109, 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 the bus system 109 in the figure.

上述本发明实施例揭示的发送前述各种帧的方法可以应用于处理单元102中，或者由处理单元102实现。在实现过程中，上述方法的各步骤可以通过处理单元102中的硬件的集成逻辑电路或者软件形式的指令完成。处理单元102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103，处理单元102读取存储器103中的信息，结合其硬件完成上述方法的步骤。The method for transmitting the foregoing various frames disclosed in the foregoing embodiments of the present invention may be applied to the processing unit 102 or implemented by the processing unit 102. In the implementation process, each step of the above method The completion may be accomplished by an integrated logic circuit of hardware in the processing unit 102 or an instruction in the form of software. The processing unit 102 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, which can be implemented or executed in an embodiment of the invention. Various methods, steps, and logic blocks of the disclosure. 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 103, and the processing unit 102 reads the information in the memory 103 and completes the steps of the above method in combination with its hardware.

图12是本发明另一实施例的接收站点的框图。图12的接收站点包括接口111、处理单元112和存储器113。处理单元112控制接收站点110的操作。存储器113可以包括只读存储器和随机存取存储器，并向处理单元112提供指令和数据。存储器113的一部分还可以包括非易失行随机存取存储器(NVRAM)。接收站点110的各个组件通过总线***119耦合在一起，其中总线***119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***119。Figure 12 is a block diagram of a receiving station in accordance with another embodiment of the present invention. The receiving site of FIG. 12 includes an interface 111, a processing unit 112, and a memory 113. Processing unit 112 controls the operation of receiving site 110. Memory 113 can include read only memory and random access memory and provides instructions and data to processing unit 112. A portion of the memory 113 may also include non-volatile line random access memory (NVRAM). The various components of the receiving site 110 are coupled together by a bus system 119, 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 119 in the figure.

上述本发明实施例揭示的接收前述各种帧的方法可以应用于处理单元112中，或者由处理单元112实现。在实现过程中，上述方法的各步骤可以通过处理单元112中的硬件的集成逻辑电路或者软件形式的指令完成。处理单元112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113，处理单元112读取存储器113中的信息，结合其硬件完成上述方法的步骤。The method for receiving the foregoing various frames disclosed in the foregoing embodiments of the present invention may be applied to the processing unit 112 or implemented by the processing unit 112. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processing unit 112 or an instruction in a form of software. The processing unit 112 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, which can be implemented or executed in an embodiment of the invention. Various methods, steps, and logic blocks of the disclosure. 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 113, and the processing unit 112 reads the information in the memory 113 in combination with the hard Complete the steps of the above method.

具体地，存储器113存储使得处理单元112执行如下操作的指令：确定资源状态信息，该资源状态信息指示接入点与站点进行数据传输的信道资源的子资源的忙闲状态；向接入点发送资源状态信息，以便于该接入点根据资源状态信息进行资源分配。Specifically, the memory 113 stores an instruction that causes the processing unit 112 to perform resource status information indicating a busy state of a sub-resource of a channel resource for which the access point performs data transmission with the station; sending to the access point Resource status information, so that the access point performs resource allocation according to resource status information.

应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本发明的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。在本发明的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。It is to be understood that the phrase "one embodiment" or "an embodiment" or "an" Thus, "in one embodiment" or "in an embodiment" or "an" In addition, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be implemented in the embodiment of the present invention. Form any limit.

另外，本文中术语“***”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。Additionally, the terms "system" and "network" are used interchangeably herein. The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

应理解，在本发明实施例中，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。It should be understood that in the embodiment of the present invention, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.

本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。 A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

在本申请所提供的几个实施例中，应该理解到，所揭露的***、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个***，或一些特征可以忽略，或不执行。另外，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也可以是电的，机械的或其它的形式连接。In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.

所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本发明实施例方案的目的。The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本发明可以用硬件实现，或固件实现，或它们的组合方式来实现。当使用软件实现时，可以将上述功能存储在计算机可读介质中或作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于：计算机可读介质可以包括RAM、ROM、EEPROM、CD-ROM或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质。此外。任何连接可以适当的成为计算机可读介质。例如，如果软件是使用同轴电缆、光纤光缆、双绞线、数字STA线(DSL)或者诸如红外线、无线电和微波之类的无线技术从网站、服务器或者其他远程源传输的，那么同轴电缆、光纤光缆、双绞线、DSL或者诸如红外线、无线和微波之类的无线技术包括在所属介质的定影中。如本发明所使用的，盘(Disk)和碟(disc)包括压缩光碟(CD)、激光碟、光碟、数字通用光碟(DVD)、软盘和蓝光光碟，其中盘通常磁性的复制数据，而碟则用激光来光学的复制数据。上面的组合也应当包括在计算机可读介质的保护范围之内。Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware, firmware implementation, or a combination thereof. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital STA line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media. As used in the present invention, a disk and a disc include a pressure Compact discs (CDs), laser discs, compact discs, digital versatile discs (DVDs), floppy discs, and Blu-ray discs, where discs are usually magnetically replicated, while discs use lasers to optically replicate data. Combinations of the above should also be included within the scope of the computer readable media.

总之，以上所述仅为本发明技术方案的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。 In summary, the above description is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

一种应用于无线局域网WLAN的数据传输方法，其特征在于，包括：A data transmission method applied to a WLAN of a wireless local area network, comprising:

生成物理层分组，所述物理层分组包含传统信令字段L-SIG和所述L-SIG之后的第一个正交频分复用OFDM符号，所述L-SIG和所述OFDM符号在频域上包含多个数据子载波，所述OFDM符号的数据子载波上的信号由所述L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到；Generating a physical layer packet, the physical layer packet including a legacy signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the OFDM symbol in frequency The domain includes a plurality of data subcarriers, and the signal on the data subcarrier of the OFDM symbol is obtained by multiplying a signal on a data subcarrier corresponding to the location of the L-SIG by an element of a corresponding position of the feature sequence;

发送所述包含L-SIG和所述OFDM符号的物理层分组。Transmitting the physical layer packet including the L-SIG and the OFDM symbol.
根据权利要求1所述的方法，其特征在于，所述L-SIG数据子载波上的信号为二进制相移键控BPSK调制符号。The method of claim 1 wherein the signal on the L-SIG data subcarrier is a binary phase shift keyed BPSK modulation symbol.
根据权利要求1或2所述的方法，其特征在于，所述L-SIG和所述OFDM符号的数据子载波的个数为48或52。The method according to claim 1 or 2, wherein the number of data subcarriers of the L-SIG and the OFDM symbol is 48 or 52.
根据权利要求1-3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，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。The method according to any one of claims 1-3, wherein the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
根据权利要求1或4所述的方法，其特征在于，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。The method according to claim 1 or 4, wherein the length of the feature sequence is the same as the number of data subcarriers of the L-SIG.
一种应用于无线局域网WLAN的数据传输方法，其特征在于，包括：A data transmission method applied to a WLAN of a wireless local area network, comprising:

接收物理层分组；Receiving physical layer packets;

解析所述物理层分组，具体包括:将所述物理层分组中的传统信令字段L-SIG后的第一个正交频分复用OFDM符号的数据子载波上的信号逐一与特征序列的各个元素相乘，将相乘后得到的信号与L-SIG数据子载波上的信号进行互相关处理； The parsing the physical layer packet includes: respectively, the signal on the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the traditional signaling field L-SIG in the physical layer packet is one by one and the feature sequence Multiplying each element, and multiplying the obtained signal with the signal on the L-SIG data subcarrier for cross-correlation processing;

确定所述物理层分组的协议版本，具体包括：若互相关处理的结果超过第一门限，则确定所述物理层分组为所述特征序列对应的协议版本的物理层分组。Determining the protocol version of the physical layer packet, specifically, if the result of the cross-correlation processing exceeds the first threshold, determining that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.
根据权利要求6所述的方法，其特征在于，所述L-SIG和所述L-SIG后的第一个正交频分复用OFDM符号的数据子载波的个数为48或52。The method according to claim 6, wherein the number of data subcarriers of the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG and the L-SIG is 48 or 52.
根据权利要求6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，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。The method according to claim 6, wherein the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
根据权利要求6或8所述的方法，其特征在于，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。The method according to claim 6 or 8, wherein the length of the feature sequence is the same as the number of data subcarriers of the L-SIG.
一种应用于无线局域网WLAN的数据传输装置，其特征在于，包括：A data transmission device applied to a WLAN of a wireless local area network, comprising:

处理单元，用于生成物理层分组，所述物理层分组包含传统信令字段L-SIG和所述L-SIG之后的第一个正交频分复用OFDM符号，所述L-SIG和所述OFDM符号在频域上包含多个数据子载波，所述OFDM符号的数据子载波上的信号由所述L-SIG对应位置的数据子载波上的信号与特征序列的对应位置的元素相乘后得到；a processing unit, configured to generate a physical layer packet, where the physical layer packet includes a traditional signaling field L-SIG and a first orthogonal frequency division multiplexing OFDM symbol after the L-SIG, the L-SIG and the The OFDM symbol includes a plurality of data subcarriers in a frequency domain, and a signal on a data subcarrier of the OFDM symbol is multiplied by a signal on a data subcarrier of the L-SIG corresponding location and an element of a corresponding position of the feature sequence After getting

收发单元，用于发送所述包含L-SIG和所述OFDM符号的物理层分组。And a transceiver unit, configured to send the physical layer packet including the L-SIG and the OFDM symbol.
根据权利要求10所述的装置，其特征在于，所述处理单元生成的物理层分组中的L-SIG数据子载波上的信号为二进制相移键控BPSK调制符号。The apparatus according to claim 10, wherein the signal on the L-SIG data subcarrier in the physical layer packet generated by the processing unit is a binary phase shift keying BPSK modulation symbol.
根据权利要求10或11所述的装置，其特征在于，所述处理单元生成的物理层分组中的L-SIG和OFDM符号的数据子载波的个数为48或52。 The apparatus according to claim 10 or 11, wherein the number of data subcarriers of the L-SIG and the OFDM symbol in the physical layer packet generated by the processing unit is 48 or 52.
根据权利要求10-12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，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。The device according to any one of claims 10-12, wherein the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
根据权利要求10或13所述的装置，其特征在于，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。The apparatus according to claim 10 or 13, wherein the length of the feature sequence is the same as the number of data subcarriers of the L-SIG.
一种应用于无线局域网WLAN的数据传输装置，其特征在于，包括：A data transmission device applied to a WLAN of a wireless local area network, comprising:

收发单元，用于接收物理层分组；a transceiver unit, configured to receive a physical layer packet;

处理单元，用于解析所述物理层分组，具体包括:将所述物理层分组中的传统信令字段L-SIG后的第一个正交频分复用OFDM符号的数据子载波上的信号逐一与特征序列的各个元素相乘，将相乘后得到的信号与L-SIG数据子载波上的信号进行互相关处理；The processing unit, configured to parse the physical layer packet, specifically includes: a signal on a data subcarrier of a first orthogonal frequency division multiplexing OFDM symbol after a traditional signaling field L-SIG in the physical layer packet Multiplying each element of the feature sequence one by one, and multiplying the obtained signal with the signal on the L-SIG data subcarrier;

处理单元，用于确定所述物理层分组的协议版本，具体包括：若互相关处理的结果超过第一门限，则确定所述物理层分组为所述特征序列对应的协议版本的物理层分组。The processing unit, configured to determine a protocol version of the physical layer packet, specifically includes: if the result of the cross-correlation processing exceeds the first threshold, determining that the physical layer packet is a physical layer packet of a protocol version corresponding to the feature sequence.
根据权利要求15所述的装置，其特征在于，所述处理单元解析的数据分组中的L-SIG和所述L-SIG后的第一个正交频分复用OFDM符号的数据子载波的个数为48或52。The apparatus according to claim 15, wherein the L-SIG in the data packet parsed by the processing unit and the data subcarrier of the first orthogonal frequency division multiplexing OFDM symbol after the L-SIG The number is 48 or 52.
根据权利要求15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，所述特征序列对应的协议版本为802.11ax协议或后续的演进协议。The apparatus according to claim 15, wherein the feature sequence is a sequence consisting of +1 and -1, and the protocol version corresponding to the feature sequence is an 802.11ax protocol or a subsequent evolved protocol.
根据权利要求15或17所述的装置，其特征在于，所述特征序列的长度与所述L-SIG的数据子载波的个数相同。 The apparatus according to claim 15 or 17, wherein the length of the feature sequence is the same as the number of data subcarriers of the L-SIG.