CN107592142B - Method and device for transmitting channel estimation sequence - Google Patents
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Abstract
The application provides a data transmission method of a channel estimation sequence, which comprises the steps of generating and transmitting a physical layer protocol data unit (PPDU), wherein the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is converted from a channel estimation initial sequence. The application also provides a corresponding transmission device of the channel estimation sequence, and through the mode, the PPDU based on the channel estimation field can support the characteristics of multiple spatial streams. And, the initial sequence of channel estimation is designed based on the Golay sequence, which can reduce the additional storage resource.
Description
The present application claims priority from the CN patent application with application number CN201610543946.1 entitled "a transmission method and apparatus for channel estimation sequence" filed by the chinese patent office at 8/7/2016, which is incorporated herein by reference in its entirety.
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a channel estimation sequence.
Background
The standardization of 802.11 standards for Wireless Local Area Networks (WLANs) has greatly reduced the cost of WLAN devices. Wi-Fi (Wireless Fidelity, Wi-Fi for short) is a brand of Wireless network communication technology, held by the Wi-Fi alliance, and aims to improve the interoperability between Wireless network products based on the 802.11 standard, and a Wireless local area network using the 802.11 series of protocols may be referred to as a Wi-Fi network.
Currently, the 802.11 standard has advanced more and more through the respective versions of 802.11a,802.11b,802.11g,802.11n and 802.11 ac. 802.11ad is a branch of the IEEE802.11 family of standards operating in the 60GHz band. The 802.11ad standard employs single channel transmission with a 2.16GHz bandwidth per channel.
Currently, the revised 802.11ay standard is dedicated to the evolution and upgrade of the 802.11ad standard. 802.11ay will support Multiple Input Multiple Output (MIMO) and Multiple channels. The existing 802.11ad channel estimation sequence cannot support a multi-antenna application scenario, and a new channel estimation sequence needs to be designed.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for transmitting a channel estimation sequence, which are used to solve the problem that the existing 802.11ad channel estimation sequence does not support a multi-antenna application scenario.
In a first aspect, an embodiment of the present invention provides a transmission method for a channel estimation sequence, which is applied to a wireless communication system with a frequency of 6GHz or higher, and the method includes: generating and transmitting a physical layer protocol data unit (PPDU), wherein the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence. The transmission method is executed by a station, an access point, a user terminal and a base station, and the PPDU with the format can support a multi-antenna application scene.
In one possible design, the initial sequence of channel estimation is { zeros (79), -Gb32, -Ga32, Gb32, Ga32, Gb32, -Gb16,0,0,0, Ga16, -Ga32, Gb32, -Ga32, -Gb32, Ga32, zeros (78) }, zeros (n) is represented as a sequence of n zeros, and n is an integer.
In one possible design, the initial sequence of channel estimation is { zeros (79), Gb32, Ga32, -Gb32, -Ga32, -Gb32, Gb16,0,0,0, -Ga16, Ga32, -Gb32, Ga32, Gb32, -Ga32, zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0, -Gb32(8:32), Ga32, -Gb32, Gb16, -Ga16, Gb32, Ga32(1:16), Ga32(17:23), zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0, Gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Ga32(1:16), -Ga32(17:23), zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0, -Gb32(8:32), Ga32, -Gb32, Gb16, -Ga16, Gb32, Gb16, Ga32(17:23), zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0, Gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Gb16, -Ga32(17:23), zeros (78) }.
Optionally, the number of channel estimation sequences in the channel estimation field is greater than or equal to the number of space-time streams supported by the PPDU.
Optionally, the channel estimation field is used for channel estimation by stations supporting 802.11 ay.
In a second aspect, an embodiment of the present invention provides a transmission apparatus for a channel estimation sequence, which is applied to a wireless communication system with a frequency of 6GHz or higher, and the apparatus includes: the device comprises a baseband processor and a transceiver, wherein the baseband processor is used for generating a physical layer protocol data unit (PPDU), the transceiver is used for transmitting the PPDU, the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence. The transmission device adopting the PPDU with the format can support the application scene of multiple antennas.
In one possible design, the initial sequence of channel estimation is { zeros (79), -Gb32, -Ga32, Gb32, Ga32, Gb32, -Gb16,0,0,0, Ga16, -Ga32, Gb32, -Ga32, -Gb32, Ga32, zeros (78) }, zeros (n) is represented as a sequence of n zeros, and n is an integer.
In one possible design, the initial sequence of channel estimation is { zeros (79), Gb32, Ga32, -Gb32, -Ga32, -Gb32, Gb16,0,0,0, -Ga16, Ga32, -Gb32, Ga32, Gb32, -Ga32, zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0, -Gb32(8:32), Ga32, -Gb32, Gb16, -Ga16, Gb32, Ga32(1:16), Ga32(17:23), zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0, Gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Ga32(1:16), -Ga32(17:23), zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0, -Gb32(8:32), Ga32, -Gb32, Gb16, -Ga16, Gb32, Gb16, Ga32(17:23), zeros (78) }.
In one possible design, the initial sequence of channel estimation is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0, Gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Gb16, -Ga32(17:23), zeros (78) }.
Optionally, the number of channel estimation sequences in the channel estimation field is greater than or equal to the number of space-time streams supported by the PPDU.
Optionally, the channel estimation field is used for channel estimation by stations supporting 802.11 ay.
The application provides a data transmission method of a channel estimation sequence, which comprises the steps of generating and transmitting a physical layer protocol data unit (PPDU), wherein the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is converted from a channel estimation initial sequence. The application also provides a corresponding transmission device of the channel estimation sequence, and through the mode, the PPDU based on the channel estimation field can support the characteristics of multiple spatial streams. And, the initial sequence of channel estimation is designed based on the Golay sequence, which can reduce the additional storage resource.
Drawings
Fig. 1 is a diagram of an application scenario of a wireless lan.
Fig. 2 is a diagram of an application scenario of a cellular communication network.
Fig. 3 is a flowchart of the method of embodiment 1 of the present application.
Fig. 4 is a frame structure diagram according to an embodiment of the present application.
Fig. 5 is a physical structure diagram of the apparatus in embodiment 2 of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, specific embodiments of the present application are described in further detail below with reference to the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application.
The embodiment of the application can be applied to the WLAN, and the adopted standard of the WLAN is IEEE802.11 series at present. The WLAN network may include a plurality of Basic Service Sets (BSSs), wherein the BSSs are connected to the core network device through a switching device, as shown in fig. 1. Each basic service set may include a Station of an Access Point class (AP for short) and a plurality of stations of a Non-Access Point class (Non-AP for short).
And the station of the access point class is also called as a wireless access point or a hot spot, and the like. APs are deployed primarily inside homes, buildings, and parks, typically covering a radius of tens to hundreds of meters. The AP acts as a bridge connecting the network and the wireless network, and mainly functions to connect the wireless network clients together and then to access the wireless network to the ethernet. Specifically, the AP may be a WiFi chip or a terminal device with a WiFi chip or a network device with a WiFi chip. The AP may support multiple systems, such as 802.11ay, 802.11ad, 802.11ax, 802.11ac, 802.11n, 802.11g,802.11 b, and 802.11 a.
A Non-Access Point (Non-AP STA) may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. Specifically, for example: support wiFi communication function's smart mobile phone, panel computer and personal computer, support wiFi communication function's STB and smart TV, support the wearable equipment of intelligence of wiFi communication function, support the vehicle-mounted communication equipment of wiFi communication function and support the unmanned aerial vehicle of wiFi communication function. The station can support multiple systems such as 802.11ay, 802.11ad, 802.11ax, 802.11ac, 802.11n, 802.11g,802.11 b and 802.11 a. Note that the Non-AP STA is simply referred to as STA hereinafter.
The embodiment of the present application may also be applied to a cellular communication system, where the cellular communication system generally includes cells, each cell includes a Base Station (BS), and the Base Station provides a communication service to a User Equipment (UE), where the Base Station is connected to a core network device, as shown in fig. 2.
It should be noted that, the cellular communication systems mentioned in the embodiments of the present application include, but are not limited to: narrowband Band-Internet of Things (NB-IoT), Global System for Mobile Communications (GSM), Enhanced Data rate GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access 2000 (Code Division Multiple Access, TD-SCDMA), Long Term Evolution (LTE), and next-generation Mobile communication systems.
In the embodiment of the present application, the base station is an apparatus deployed in a radio access network to provide a wireless communication function for a UE. The base stations may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like. In systems using different radio access technologies, the name of a device having a base station function may be different, for example, in an LTE system, the device is called an evolved Node B (eNB or eNodeB), and in a third Generation (3 rd Generation, abbreviated as 3G) system, the device is called a Node B (english: Node B). For convenience of description, in all embodiments of the present application, the above-mentioned apparatuses providing a UE with a wireless communication function are collectively referred to as a base station or a BS.
The UE referred to in the embodiments of the present application may include various handheld devices, vehicle mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem with wireless communication capabilities. The UE may also be referred to as a Mobile Station (MS), a terminal (terminal), and a terminal device (terminal equipment), and may further include a subscriber unit (subscriber unit), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a Personal Digital Assistant (PDA) computer, a tablet computer, a wireless modem (modem), a handheld device (handset), a laptop computer (laptop computer), a Machine Type Communication (MTC) terminal, and the like. For convenience of description, in all embodiments of the present application, the above-mentioned devices are collectively referred to as a UE.
Example 1
step 301: generating a physical layer protocol data unit (PPDU), wherein the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence.
Step 302: and sending the PPDU.
Specifically, the transmission method is applied to a high frequency wireless communication system, and the high frequency comprises a frequency band above 6 GHz. Preferably, the transmission method is applicable to a 28GHz band or a 60GHz band.
Specifically, the PPDU contains a preamble part and a payload part, as shown in FIG. 4, wherein the preamble part is composed of a conventional Short Training Field (L-STF) and a conventional Channel estimation Field (L-CEF), and a conventional Header Field (EDMG Header A) and an Enhanced directed Multi-Gigabit Header A Field (EDMG Header A) and an Enhanced directed Multi-Gigabit Short Training Field (EDMG-STF) and an Enhanced directed Multi-Gigabit Channel estimation Field (EDMG-CEF) and an Enhanced directed Multi-Gigabit Header B Field (EDMG Header B).
It should be noted that the channel estimation field in step 301 is an enhanced directional multi-gigabit channel estimation field (abbreviated as EDMG-CEF) in fig. 4, and the channel estimation field is used for channel estimation by stations supporting 802.11 ay. The L-CEF in fig. 4 is used for channel estimation by stations supporting 802.11 ad.
It should be noted that 802.11ay supports the characteristics of multiple antennas (i.e., multiple space-time streams). Wherein the number of channel estimation sequences in a channel estimation field in a PPDU based on 802.11ay is greater than or equal to the number of space-time streams supported by the PPDU. For example, an 802.11ay based transmitter supports two antennas, then the 802.11ay transmitter transmits a PPDU in which the channel estimation field includes two channel estimation sequences. An 802.11ay based transmitter supports three antennas, then the 802.11ay transmitter transmits a PPDU in which the channel estimation field includes four channel estimation sequences.
It should be noted that, in step 301, each of the one or more channel estimation sequences is obtained by converting from a channel estimation initial sequence. The conversion operation of the initial sequence of the channel estimation comprises the operations of mapping to different space-time streams, multiplying by a P matrix, cyclic shift diversity, inverse discrete Fourier transform and the like. The above-mentioned conversion operation of the initial sequence of channel estimation is similar to the generation process of VHT-LTF (very high rate long training sequence) in the 802.11ac standard, and is not expanded in detail.
Specifically, the number of subcarriers for OFDM modulation used in the physical layer of 11ay is 512, and the length of the initial sequence of channel estimation is 512. The initial sequence of the channel estimation is a frequency domain sequence and is composed based on a Gray Golay sequence, wherein the Golay sequence has good autocorrelation characteristics and cross-correlation characteristics and can be used for channel estimation.
It should be noted that the Golay sequences in this application mainly use Ga32, Gb32, Ga16, Gb16, and the like.
Wherein Ga32 { +1, +1, +1, +1, +1, -1, +1, -1, -1, -1, -1, +1, +1, +1, +1, -1, -1, +1, +1, +1, -1, -1, +1, -1, -1, +1, -1.
Gb32＝{-1,-1,-1,-1,-1,1,-1,1,1,1,-1,-1,-1,1,1,-1,1,1,-1,-1,1,-1,-1,1,-1,-1,-1,-1,1,-1,1,-1}。
Ga16＝{-1,-1,1,1,-1,1,1,-1,1,1,1,1,-1,1,-1,1}。
Gb16＝{1,1,1,1,1,-1,1,-1,-1,-1,1,1,1,-1,-1,1}。
Optionally, the channel estimation initial sequence includes at least the following embodiments:
embodiment 1: { zeros (79), -Gb32, -Ga32, Gb32, Ga32, Gb32, -Gb16,0,0,0,
ga16, -Ga32, Gb32, -Ga32, -Gb32, Ga32, zeros (78) }. zeros (n) is represented as a sequence of n zeros, n being an integer.
Specifically, the complete expression of embodiment 1 is: {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1, -1,1, -1, -1, -1,1,1,1, -1, -1,1, -1, -1,1,1, -1,1,1, -1,1,1,1,1, -1,1, -1,1, -1, -1, -1, -1, -1,1, -1,1,1,1, -1, -1, -1,1,1, -1, -1, -1,1,1, -1,1,1, -1,1,1,1,1, -1,1, -1,1, -1, -1, -1, -1, -1,1, -1,1,1,1, -1, -1, -1,1,1, -1,1,1, -1, -1,1, -1, -1,1, -1, -1, -1, -1,1, -1,1, -1,1,1,1,1,1, -1,1, -1, -1, -1,1,1,1, -1, -1,1,1,1, -1, -1,1, -1, -1,1, -1, -1, -1, -1,1, -1,1, -1, -1, -1, -1, -1, -1,1, -1,1,1,1, -1, -1, -1,1,1, -1,1,1, -1, -1,1, -1, -1,1, -1, -1, -1, -1,1, -1,1, -1, -1, -1, -1, -1, -1,1, -1,1,1,1, -1, -1, -1,1,1, -1,0,0,0, -1, -1,1,1, -1,1,1, -1,1,1,1,1, -1,1, -1,1, -1, -1, -1, -1, -1,1, -1,1,1,1, -1, -1, -1,1,1, -1, -1, -1,1,1, -1,1,1, -1,1,1,1,1, -1,1, -1,1, -1, -1, -1, -1, -1,1, -1,1,1,1, -1, -1, -1,1,1, -1,1,1, -1, -1,1, -1, -1,1, -1, -1, -1, -1,1, -1,1, -1, -1, -1, -1, -1, -1,1, -1,1,1,1, -1, -1, -1,1,1, -1, -1, -1,1,1, -1,1,1, -1,1,1,1,1, -1,1, -1,1,1,1,1,1,1, -1,1, -1, -1, -1,1,1,1, -1, -1,1, -1, -1,1,1, -1,1,1, -1,1,1,1,1, -1,1, -1,1,1,1,1,1,1, -1,1, -1, -1, -1,1,1,1, -1, -1,1,1,1, -1, -1,1, -1, -1,1, -1, -1, -1, -1,1, -1,1, -1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}.
Embodiment 2: { zeros (79), Gb32, Ga32, -Gb32, -Ga32, -Gb32, Gb16,0,0,0, -Ga16, Ga32, -Gb32, Ga32, Gb32, -Ga32, zeros (78) }.
In embodiment 1 and embodiment 2, a set of sequences with opposite polarities is used. The opposite polarity means that +1 is changed to-1, -1 is changed to +1, and 0 is not changed in the sequence.
Embodiment 3: { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0, -Gb32(8:32), Ga32, -Gb32, Gb16, -Ga16, Gb32, Ga32(1:16), Ga32(17:23), zeros (78) }.
Embodiment 4: { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0, Gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Ga32(1:16), -Ga32(17:23), zeros (78) }.
In embodiment 3 and embodiment 4, a set of sequences with opposite polarities is used.
Embodiment 5: { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0, -Gb32(8:32), Ga32, -Gb32, Gb16, -Ga16, Gb32, Gb16, Ga32(17:23), zeros (78) }.
Embodiment 6: { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0, Gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Gb16, -Ga32(17:23), zeros (78) }.
In embodiment 5 and embodiment 6, a set of sequences with opposite polarities is used.
Embodiment 7:
{zeros(79),-Gb16,Ga16,-Gb16,-Ga16,Gb16,Ga16,-Gb16,-Ga16,-Gb16,-Ga16,-Gb16,0,0,0,Ga16,-Gb16,Ga16,-Gb16,Ga16,Gb16,-Ga16,-Gb16,Ga16,Gb16,Ga16,zeros(78)}
embodiment 8:
{zeros(79),Gb16,-Ga16,Gb16,Ga16,-Gb16,-Ga16,Gb16,Ga16,Gb16,Ga16,Gb16,0,0,0,-Ga16,Gb16,-Ga16,Gb16,-Ga16,-Gb16,Ga16,Gb16,-Ga16,-Gb16,-Ga16,zeros(78)}
wherein, the embodiment 1 gives the complete initial sequence of channel estimation, and the embodiments 2 to 6 and the embodiments 7 to 8 can obtain the complete initial sequence of channel estimation without doubt through the Ga32, Ga16, Gb32 and Gb16 sequences, and no longer provide the complete initial sequence of channel estimation due to space limitation.
It should be noted that the symbols of the payload portion of the PPDU adopt a Binary Phase Shift Keying (BPSK) Modulation scheme, a pi/2-BPSK Modulation scheme, a Quadrature Phase Shift Keying (QPSK) Modulation scheme, a pi/2-QPSK or a16 QAM (QAM).
It is added that the actions of the receiver in the transmission method of the channel estimation sequence at least include the following implementation manners.
Step 1: receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence.
Step 2: and analyzing the PPDU, and acquiring channel parameters through the channel estimation field.
It should be noted that the process of acquiring the channel parameters by the receiver through analyzing the channel estimation field of the PPDU is similar to the operation of the receiver on the VHT-LTF sequence in the 802.11ac standard, and is not described again.
In summary, embodiment 1 of the present application provides a data transmission method of channel estimation sequences, where the data transmission method includes generating and transmitting a PPDU, the PPDU includes a channel estimation field, where the channel estimation field includes one or more channel estimation sequences, and each of the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence, and in this way, the PPDU based on the channel estimation field may support characteristics of multiple spatial streams. And, the initial sequence of channel estimation is designed based on the Golay sequence, which can reduce the extra memory resource.
Example 2
Fig. 5 shows a schematic block diagram of a transmission apparatus of a channel estimation sequence according to embodiment 2, where the apparatus is, for example, an access point, a station, a base station, or a UE, and the apparatus may also be an Application Specific Integrated Circuit (ASIC) or a chip for implementing related functions. The device 1000 includes a processor 1010, a memory 1020, a baseband processor 1030, a transceiver 1040, an antenna 1050, a bus 1060, and a user interface 1070. The apparatus may be the AP and the STA shown in fig. 1, or the base station and the UE shown in fig. 2.
In particular, the operation of the apparatus 1000 is controlled by a processor 1010, which 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. Memory 1020 may include read-only memory and random access memory, and provide instructions and data to processor 1010, and a portion of memory 1020 may also include non-volatile random access memory (NVRAM). The processor 1010 generally executes program instructions in the memory 1020 to perform the logical operations and arithmetic operations of the channel estimation sequence transmission method of the present application.
The baseband processor 1030 is configured to generate a baseband signal (e.g., a frame or a data packet or a PPDU), or parse a received baseband signal to obtain data, where the baseband processor includes an encoder and a modulator, and the encoder can improve robustness of the baseband signal, overcome interference and fading in a wireless propagation environment, and reduce errors generated by transmission. The modulator can select a suitable signal modulation mode according to the wireless propagation environment.
The transceiver 1040 includes a transmitting circuit and a receiving circuit, the transmitting circuit is configured to obtain a high-frequency carrier signal by performing up-conversion modulation on a baseband signal generated by the baseband processor 1030, the high-frequency carrier signal is transmitted through the antenna 1050, and the receiving circuit performs down-conversion on the high-frequency signal received by the antenna 1050 to obtain a low-frequency baseband signal. Where the number of antennas 1050 is one or more. The apparatus 1000 may also include a user interface 1070, the user interface 1070 including a keypad, microphone and/or touch screen. The user interface 1070 may deliver content and control operations to the access point 1000.
The various components of device 1000 are coupled together by a bus 1060, where bus system 1060 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are designated as the bus system 1060 in the figure. It should be noted that the above description of the access point structure can be applied to the following embodiments.
A baseband processor 1030 configured to generate a physical layer protocol data unit PPDU, where the PPDU includes a channel estimation field, where the channel estimation field includes one or more channel estimation sequences, and each of the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence.
A transceiver 1040 for transmitting the PPDU.
Specifically, the number of channel estimation sequences in the channel estimation field is greater than or equal to the number of space-time streams supported by the PPDU.
In particular, the channel estimation field is used for channel estimation by stations supporting 802.11 ay.
It should be noted that the structure of the PPDU is explained in detail in embodiment 1 and fig. 4, and is not described again.
Optionally, the channel estimation initial sequence specifically includes the following embodiments:
embodiment 1:
{ zeros (79), -Gb32, -Ga32, Gb32, Ga32, Gb32, -Gb16,0,0,0, Ga16, -Ga32, Gb32, -Ga32, -Gb32, Ga32, zeros (78) }, zeros (n) represents n zero-composed sequences, and n is an integer.
Embodiment 2:
{zeros(79),Gb32,Ga32,-Gb32,-Ga32,-Gb32,Gb16,0,0,0,-Ga16,Ga32,-Gb32,Ga32,Gb32,-Ga32,zeros(78)}。
embodiment 3:
{zeros(79),Ga32(24:32),-Gb32,-Gb32,Ga32,-Ga32,-Ga32,-Gb32(1:7),0,0,0,-Gb32(8:32),Ga32,-Gb32,Gb16,-Ga16,Gb32,Ga32(1:16),Ga32(17:23),zeros(78)}。
embodiment 4:
{zeros(79),-Ga32(24:32),Gb32,Gb32,-Ga32,Ga32,Ga32,Gb32(1:7),0,0,0,Gb32(8:32),-Ga32,Gb32,-Gb16,Ga16,-Gb32,-Ga32(1:16),-Ga32(17:23),zeros(78)}。
embodiment 5:
{zeros(79),Ga32(24:32),-Gb32,-Gb32,Ga32,-Ga32,-Ga32,-Gb32(1:7),0,0,0,-Gb32(8:32),Ga32,-Gb32,Gb16,-Ga16,Gb32,Gb16,Ga32(17:23),zeros(78)}。
embodiment 6:
{zeros(79),-Ga32(24:32),Gb32,Gb32,-Ga32,Ga32,Ga32,Gb32(1:7),0,0,0,Gb32(8:32),-Ga32,Gb32,-Gb16,Ga16,-Gb32,-Gb16,-Ga32(17:23),zeros(78)}。
embodiment 7:
{zeros(79),-Gb16,Ga16,-Gb16,-Ga16,Gb16,Ga16,-Gb16,-Ga16,-Gb16,-Ga16,-Gb16,0,0,0,Ga16,-Gb16,Ga16,-Gb16,Ga16,Gb16,-Ga16,-Gb16,Ga16,Gb16,Ga16,zeros(78)}
embodiment 8:
{zeros(79),Gb16,-Ga16,Gb16,Ga16,-Gb16,-Ga16,Gb16,Ga16,Gb16,Ga16,Gb16,0,0,0,-Ga16,Gb16,-Ga16,Gb16,-Ga16,-Gb16,Ga16,Gb16,-Ga16,-Gb16,-Ga16,zeros(78)}
it is added that the actions of the receiver in the transmission means of the channel estimation sequence comprise at least the following implementations.
Step 1: receiving a physical layer protocol data unit (PPDU), wherein the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence.
Step 2: and analyzing the PPDU, and acquiring channel parameters through the channel estimation field.
It should be noted that the process of acquiring the channel parameters by the receiver through analyzing the channel estimation field of the PPDU is similar to the operation of the receiver on the VHT-LTF sequence in the 802.11ac standard, and is not described again.
In summary, embodiment 2 of the present application provides a transmission apparatus of channel estimation sequences, the transmission apparatus includes a baseband processor and a transceiver, where the baseband processor is configured to generate a PPDU, the transceiver is configured to transmit the PPDU, the PPDU includes a channel estimation field, the channel estimation field includes one or more channel estimation sequences, and each of the one or more channel estimation sequences is converted from a channel estimation initial sequence, and in this way, the PPDU based on the channel estimation field can support characteristics of multiple spatial streams. And, the initial sequence of channel estimation is designed based on the Golay sequence, which can reduce the extra memory resource.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be substantially implemented or a part of the technical solutions contributing to the prior art may be embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
Claims (6)
1. A transmission method of a channel estimation sequence is applied to a wireless communication system with the frequency of 6GHz or higher, and is characterized by comprising the following steps:
generating a physical layer protocol data unit (PPDU), wherein the PPDU comprises a channel estimation field, the channel estimation field comprises one or more channel estimation sequences, and each channel estimation sequence in the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence;
sending the PPDU;
wherein the initial sequence of channel estimation is { zeros (79), -Gb32, -Ga32, Gb32, Ga32, Gb32, -Gb16,0,0,0, Ga16, -Ga32, Gb32, -Ga32, -Gb32, Ga32, zeros (78) };
alternatively, the initial sequence of channel estimation is { zeros (79), Gb32, Ga32, -Gb32, -Ga32, -Gb32, Gb16,0,0,0, -Ga16, Ga32, -Gb32,
Ga32,Gb32,-Ga32,zeros(78)}；
alternatively, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0,
-Gb32(8:32),Ga32,-Gb32,Gb16,-Ga16,Gb32,Ga32(1:16),Ga32(17:23),
zeros(78)}；
alternatively, the initial sequence of channel estimation is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0,
Gb32(8:32),-Ga32,Gb32,-Gb16,Ga16,-Gb32,-Ga32(1:16),-Ga32(17:23),zeros(78)}；
alternatively, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0,
-Gb32(8:32),Ga32,-Gb32,Gb16,-Ga16,Gb32,Gb16,Ga32(17:23),zeros(78)}；
alternatively, the channel estimation initial sequence is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0, Gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Gb16, -Ga32(17:23), zeros (78) }; where zeros (n) is represented as a sequence of n zeros, and n is an integer.
2. The method of claim 1, wherein the number of channel estimation sequences in the channel estimation field is greater than or equal to the number of space-time streams supported by the PPDU.
3. The method according to claim 1 or 2, wherein the channel estimation field is used for channel estimation by stations supporting 802.11 ay.
4. A transmission apparatus of a channel estimation sequence, applied to a wireless communication system with a frequency of 6GHz or higher, the apparatus comprising:
a baseband processor, configured to generate a physical layer protocol data unit PPDU, where the PPDU includes a channel estimation field, the channel estimation field includes one or more channel estimation sequences, and each of the one or more channel estimation sequences is obtained by converting a channel estimation initial sequence;
a transceiver for transmitting the PPDU;
wherein the initial sequence of channel estimation is { zeros (79), -Gb32, -Ga32, Gb32, Ga32, Gb32, -Gb16,0,0,0, Ga16, -Ga32, Gb32, -Ga32, -Gb32, Ga32, zeros (78) };
alternatively, the initial sequence of channel estimation is { zeros (79), Gb32, Ga32, -Gb32, -Ga32, -Gb32, Gb16,0,0,0, -Ga16, Ga32, -Gb32,
Ga32,Gb32,-Ga32,zeros(78)}；
alternatively, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0,
-Gb32(8:32),Ga32,-Gb32,Gb16,-Ga16,Gb32,Ga32(1:16),Ga32(17:23),
zeros(78)}；
alternatively, the initial sequence of channel estimation is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0,
Gb32(8:32),-Ga32,Gb32,-Gb16,Ga16,-Gb32,-Ga32(1:16),-Ga32(17:23),zeros(78)}；
alternatively, the initial sequence of channel estimation is { zeros (79), Ga32(24:32), -Gb32, -Gb32, Ga32, -Ga32, -Ga32, -Gb32(1:7),0,0,0,
-Gb32(8:32),Ga32,-Gb32,Gb16,-Ga16,Gb32,Gb16,Ga32(17:23),zeros(78)}；
alternatively, the initial sequence of channel estimation is { zeros (79), -Ga32(24:32), Gb32, Gb32, -Ga32, Ga32, Ga32, Gb32(1:7),0,0,0,
gb32(8:32), -Ga32, Gb32, -Gb16, Ga16, -Gb32, -Gb16, -Ga32(17:23), zeros (78) }; where zeros (n) is represented as a sequence of n zeros, and n is an integer.
5. The apparatus of claim 4, wherein the number of channel estimation sequences in the channel estimation field is greater than or equal to the number of space-time streams supported by the PPDU.
6. The apparatus of claim 4 or 5, wherein the channel estimation field is used for channel estimation by stations supporting 802.11 ay.
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