WO2022142806A1 - 用于Wi-Fi的多输入多输出接收机和电子设备 - Google Patents

用于Wi-Fi的多输入多输出接收机和电子设备 Download PDF

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Publication number
WO2022142806A1
WO2022142806A1 PCT/CN2021/131006 CN2021131006W WO2022142806A1 WO 2022142806 A1 WO2022142806 A1 WO 2022142806A1 CN 2021131006 W CN2021131006 W CN 2021131006W WO 2022142806 A1 WO2022142806 A1 WO 2022142806A1
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Prior art keywords
gating
unit
energy detection
output
input
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English (en)
French (fr)
Inventor
马腾飞
陈国础
闫之刚
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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Priority to US18/260,043 priority Critical patent/US12308929B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a multiple-input multiple-output receiver and an electronic device for Wi-Fi.
  • 802.11AX supports multiple input multiple output (multiple input multiple output, MIMO).
  • MIMO multiple input multiple output
  • the technical solution of the present application provides a multiple-input multiple-output receiver and electronic device for Wi-Fi, which can reduce cost and power consumption by reducing the hardware complexity in the receiver.
  • a multiple-input multiple-output receiver for Wi-Fi including:
  • the input end of the receive chain is coupled to the corresponding antenna
  • the multiplex gating unit has a gating input end corresponding to each of the receive chains, the The output end of the receiving link is coupled to the gating input end corresponding to the multiplex gating unit;
  • the multiplex gating unit has an energy detection gating output terminal and n-1 non-energy detection gating output terminals, and the energy detection gating output terminal is coupled to the frequency offset adjustment through the energy detection unit. a unit, each non-energy detection gating output end is coupled to the frequency offset adjusting unit, and the multiplexing gating unit is used to communicate between each gating input end and a gating output end;
  • a gating control unit coupled to the multiplex gating unit, the gating control unit is used to periodically obtain the signal strength of each of the receiving links, and according to the signal strength of each of the receiving links
  • the multiplex gating unit is controlled to communicate between the gating input end corresponding to one of the receiving links satisfying the preset condition and the energy detecting gating output end.
  • the gating control unit is specifically configured to periodically acquire the signal strength of each of the receive chains, and control the multiplex gating unit to make the receive chain with the maximum signal strength
  • the gating input end corresponding to the channel is communicated with the energy detecting gating output end.
  • the gating control unit is specifically configured to periodically acquire the signal strength and signal-to-noise ratio of each of the receiving links, and control the multiplexing gating unit to have the maximum signal
  • the gating input end corresponding to the receiving link with the strength and satisfying the preset signal-to-noise ratio range is communicated with the energy detection gating output end.
  • each of the receive chains includes an automatic gain control unit.
  • each of the receiving links includes a low noise amplifier, a frequency down conversion unit and an automatic gain control unit sequentially coupled between the input end and the output end.
  • the energy detection gate output terminal is coupled to the energy detection unit through an analog-to-digital converter and a related detection unit in sequence;
  • the non-energy detection gate output terminal is sequentially coupled to the frequency offset adjustment unit through an analog-to-digital converter and a related detection unit.
  • each of the receiving links includes a low noise amplifier, a down-conversion unit, an automatic gain control unit and an analog-to-digital converter sequentially coupled between the input end and the output end.
  • the energy detection gating output terminal is coupled to the energy detection unit through a related detection unit;
  • the non-energy detection gate output terminal is coupled to the frequency offset adjustment unit through a correlation detection unit.
  • each of the receiving links includes a low-noise amplifier, a down-conversion unit, an automatic gain control unit, an analog-to-digital converter and a correlation detection unit sequentially coupled between the input end and the output end .
  • the gating control unit is specifically configured to periodically acquire the received signal strength indication RSSI of the beacon frame of each receiving link, and control the multiplex gating The unit communicates between the strobe input terminal corresponding to the receive link with the largest RSSI and the energy detection strobe output terminal.
  • the MIMO receiver for Wi-Fi further includes: a symbol timing synchronization unit coupled to the frequency offset adjustment unit.
  • an electronic device including the above-mentioned multiple-input multiple-output receiver for Wi-Fi.
  • a receiving link that satisfies the preset condition can be switched to the signal strength according to the signal strength.
  • the energy detection unit is connected, so that the energy detection unit can only perform energy detection on the receiving link that meets the signal strength condition, so that there is no need to set up a corresponding energy detection unit for each receiving link, and the number of energy detection units is reduced.
  • the hardware complexity in the receiver is reduced, and the cost and power consumption are reduced.
  • the receiving link switching process of the receiver can be implemented at the physical layer, and no software is required at this time; since only one receiving link can be reserved for energy detection, it is possible to save system-level chips (System on Chip, SOC) area, reduce power consumption; ensure the maximum signal strength of the receiving link for energy detection to optimize signal reception performance.
  • SOC System on Chip
  • 1 is a structural block diagram of a MIMO receiver for Wi-Fi
  • FIG. 2 is a structural block diagram of a MIMO receiver for Wi-Fi in an embodiment of the application
  • Fig. 3 is another state schematic diagram of the receiver in Fig. 2;
  • FIG. 4 is a structural block diagram of another MIMO receiver for Wi-Fi in an embodiment of the present application.
  • FIG. 5 is a structural block diagram of another MIMO receiver for Wi-Fi in an embodiment of the present application.
  • FIG. 6 is a structural block diagram of another MIMO receiver for Wi-Fi in an embodiment of the application.
  • Fig. 7 is another state schematic diagram of the receiver in Fig. 6;
  • FIG. 8 is a schematic diagram of another state of the receiver in FIG. 6 .
  • the electronic devices involved in this application may be mobile phones, routers, tablet computers, personal computers (PCs), personal digital assistants (PDAs), smart watches, Netbooks, wearable electronic devices, augmented reality (AR) devices, virtual reality (VR) devices, in-vehicle devices, drone devices, smart cars, smart speakers, robots, smart glasses, etc.
  • the electronic device includes a receiver for wireless communication with another electronic device.
  • the receiver involved in this application is a MIMO receiver for Wi-Fi.
  • FIG. 1 is a structural block diagram of a MIMO receiver for Wi-Fi.
  • the receiver includes multiple antennas 01.
  • Each antenna 01 corresponds to a receiving chain 001
  • the receiving chain 011 includes a low noise amplifier 02 (low noise amplifier, LNA), a down-conversion unit 03, an automatic gain control (Automatic Gain Control, AGC) unit 04, an analog-to-digital converter 05 (Analog-to-Digital Converter, ADC), detection unit 06
  • the input end of the receiving chain 011 is coupled to the corresponding antenna 01
  • the output end of the receiving chain 011 is coupled to the frequency offset adjustment unit 07
  • the frequency offset adjustment The unit 07 is coupled to the symbol timing synchronization unit 08 .
  • each receiving link 011 needs to modulate the AGC separately. After the signal of each receiving link 011 is converted into a digital signal by ADC, it needs to be correlated by the detection unit 06.
  • Detection and energy detection According to the results of correlation detection and energy detection, AGC is adjusted for each receiving link 011, and the results of energy detection or correlation detection of multiple receiving links 011 after AGC adjustment are integrated, and frequency offset adjustment is performed.
  • the unit 07 performs frequency offset adjustment, and performs symbol timing synchronization adjustment through the symbol timing synchronization unit 08.
  • the signal is solved, and the subsequent steps are performed. Demodulation of packets.
  • the throughput of receivers increases, the number of antennas 01 and receive chains 011 increases, and the hardware and power consumption resources required by each receive chain 011 increase exponentially. For example, for each receive chain 011, energy detection needs to be performed by the detection unit 06 when the signal is weak. Therefore, the MIMO receiver shown in FIG. 1 has more hardware structures, resulting in higher cost and power consumption.
  • an embodiment of the present application provides a multiple-input multiple-output MIMO receiver for Wi-Fi.
  • the receiver includes: n antennas 1, n ⁇ 2; an energy detection unit 2 ; Multiplex gating unit 3, multiplex gating unit 3;
  • the receiving chain 10 corresponding to each antenna 1, the input end of the receiving chain 10 is coupled to the corresponding antenna 1, and the multiplexing gating unit 3 has a The gating input terminal IN corresponding to each receiving link 10, the output terminal of the receiving link 10 is coupled to the gating input terminal IN corresponding to the multiplexing gating unit 3; the frequency offset adjusting unit 4; the multiplexing gating unit 3
  • the pass output terminal ON is coupled to the frequency offset adjustment unit 4, and the multiplex
  • the receiving link 10 is used to process the signal received through the antenna 1, and the processed signal is transmitted to the frequency offset adjustment unit 4 through the energy detection unit 2, or the processed signal is directly transmitted to the frequency offset adjustment unit 4 , that is to say, there is no energy detection unit between the frequency offset adjustment unit 4 and any non-energy detection gating output ON, that is, only the output signal of one receiving chain 10 will pass through the energy detection unit 2, and the other receiving chains
  • the output signal of the path 10 is directly transmitted to the frequency offset adjustment unit 4 .
  • the multiplexing unit 3 is used to connect the output end of the receiving link 10 to the frequency offset adjusting unit 4, wherein only one output end of the receiving link 10 is connected to the frequency offset adjusting unit 4 through the energy detection unit 2, and the other channels are connected to the frequency offset adjusting unit 4 through the energy detection unit 2.
  • the output end of the receiving link 10 is connected to the frequency offset adjusting unit 4 without passing through the energy detecting unit, that is to say, the energy detecting unit 2 only performs energy detecting on the output signal of one receiving link 10, and the energy detecting unit 2 It will be turned on when it is detected that the signal-to-noise ratio of the received signal and the received signal strength indicator (Received Signal Strength Indication, RSSI) are lower than the threshold, and energy detection is performed.
  • RSSI Receiveived Signal Strength Indication
  • the multiplex gating unit 3 has two gating states.
  • the first gating state as shown in FIG. 2 .
  • the gating input terminal IN corresponding to the first receiving link 10 is connected to the energy detection gating output terminal OE, and the gating input terminal IN corresponding to the second receiving link 10 is connected to the non-energy detection gating output
  • the terminal is ON, that is to say, in the first gating state, the energy detection unit 2 will only detect the signal of the first receiving link 10, but will not detect the signal of the second receiving link 10;
  • the ON state as shown in FIG.
  • the gating input terminal IN corresponding to the first receiving link 10 is connected to the non-energy detection gating output terminal ON, and the gating input terminal corresponding to the second receiving link 10 IN is connected to the energy detection gating output terminal OE, that is to say, in the second gating state, the energy detection unit 2 will only detect the signal of the second receiving link 10, but will not detect the first receiving link 10 signal.
  • the gating control unit 5 can control the multiplexing gating unit 3 to switch between the first gating state and the second gating state.
  • the gating control unit 5 will periodically obtain the signal strength of each receiving link 10, and select a receiving link 10 that satisfies a preset condition according to the signal strength, and control a receiving link 10 that satisfies the preset condition to connect to the energy
  • the detection unit 2, for example, the multiplex gating unit 3 is currently in the first gating state, and at this time, the gating control unit 5 finds that the second receiving link 10 has a The signal strength is greater than that of the first receiving link 10.
  • the gating control unit 5 will control the multiplexing gating unit 3 to switch to the second gating state, that is, the second receiving link 10 with the maximum signal strength will be switched to
  • the energy detection unit 2 is connected, so that the energy detection unit 2 performs energy detection on the receiving link 10 of the maximum signal strength, so as to realize that more effective frequency offset adjustment and other processing can be performed based on the energy detection result, so as to realize the optimization of signal reception performance. Purpose.
  • a receiving link that satisfies the preset condition can be switched to the signal strength according to the signal strength.
  • the energy detection unit is connected, so that the energy detection unit can only perform energy detection on the receiving link that meets the signal strength condition, so that there is no need to set up a corresponding energy detection unit for each receiving link, and the number of energy detection units is reduced.
  • the hardware complexity in the receiver is reduced, and the cost and power consumption are reduced.
  • the receiving link switching process of the receiver can be implemented at the physical layer, and no software is required at this time; since only one receiving link can be reserved for energy detection, it is possible to save system-level chips (System on Chip, SOC) area, reduce power consumption; ensure the maximum signal strength of the receiving link for energy detection to optimize signal reception performance.
  • SOC System on Chip
  • the gating control unit 5 is specifically configured to periodically acquire the signal strength of each receiving link 10, and control the multiplexing gating unit 3 so that the receiving link 10 with the maximum signal strength is The corresponding gate input terminal IN is communicated with the energy detection gate output terminal OE.
  • the gating control unit 5 is specifically configured to periodically acquire the signal strength and Signal Noise Ratio (SNR) of each receiving link 10, and control the multiplex gating unit 3
  • SNR Signal Noise Ratio
  • the gating input terminal IN corresponding to the receiving link 10 having the maximum signal strength and satisfying the preset signal-to-noise ratio range is connected with the energy detection gating output terminal OE.
  • an acceptable signal-to-noise ratio range is set. After determining that a certain receiving link 10 has the maximum signal strength, refer to the SNR. If If the SNR is within the preset range, that is, the noise is small, then the receiving link 10 is switched to the connection energy detection unit 2, and it is assumed that a receiving link 10 has the maximum signal strength, but the SNR exceeds the preset range, that is, It is illustrated that the signal on the receiving link 10 may have high strength due to interference. Therefore, even if the signal strength is the highest, since the SNR does not meet the preset range, the handover is not performed at this time.
  • each receiving chain 10 includes an automatic gain control AGC unit 11, that is, the above-mentioned switching can be performed on the signal after the AGC adjustment is performed in each receiving chain 10, and each receiving chain 10 has Individually adjusted AGCs allow each receive chain 10 to have maximum dynamic range.
  • each receiving chain 10 includes a low-noise amplifier 12, a down-conversion unit 13 and an automatic gain control unit 11 sequentially coupled between the input terminal and the output terminal.
  • the energy detection gate output terminal OE is coupled to the energy detection unit 2 through the analog-to-digital converter 14 and the related detection unit 15 in sequence; the non-energy detection gate output terminal is ON It is coupled to the frequency offset adjustment unit 4 through the analog-to-digital converter 14 and the correlation detection unit 15 in sequence. That is to say, only the radio frequency part before the analog-to-digital converter 14 is used as the switchable part of the receiving chain 10, and after the receiving chain 10 is switched, the analog-to-digital conversion is performed by the analog-to-digital converter 14 and the correlation detection unit 15 is used. Correlation detection is performed, wherein, after the correlation is successful, the correlation detection unit 15 can be turned off. After the correlation detection unit 15 is turned off, the correlation detection unit 15 will not perform correlation detection, but will not affect the passing signal, so that the analog-to-digital converter 14 and the The signal of the correlation detection unit 15 is subjected to energy detection.
  • each receiving chain 10 includes a low-noise amplifier 12, a down-conversion unit 13, and an automatic gain control sequentially coupled between the input end and the output end unit 11 and analog to digital converter 14 . That is to say, after the signal in each receiving chain 10 passes through the analog-to-digital converter 14 , it can be switched in the multiplexing unit 3 .
  • the energy detection strobe output terminal OE is coupled to the energy detection unit 2 through the relevant detection unit 15 ; the non-energy detection strobe output terminal ON is coupled through the relevant detection unit 15 in the frequency offset adjustment unit 4 .
  • each receiving chain 10 includes a low-noise amplifier 12, a down-conversion unit 13, and an automatic gain control sequentially coupled between the input end and the output end unit 11 , analog-to-digital converter 14 and correlation detection unit 15 . That is to say, after the signal in each receiving chain 10 passes through the analog-to-digital converter 14 and the correlation detection unit 15 , it can be switched in the multiplexing unit 3 .
  • the gating control unit 5 is specifically configured to periodically acquire the received signal strength indication RSSI of the beacon frame of each receiving link 10, and control the multiplex gating unit 3 to have The gating input end corresponding to the receiving link 10 of the maximum RSSI is communicated with the energy detecting gating output end OE. That is to say, the signal strength of each receiving link 10 can be determined by the size of the RSSI, and the switching of the multiplexing unit 3 can be controlled based on this.
  • the receiver further includes: a symbol timing synchronization unit 6 coupled to the frequency offset adjustment unit 4 .
  • the multiplex gating unit 3 It has three strobe input terminals IN, one energy detection strobe output terminal OE and two non-energy detection strobe output terminals ON.
  • Each receiving link 10 has an individually modulated automatic gain control AGC unit 11, and multiple receiving links 10 can be switched through the multiplexing unit 3. For example, when the RSSI of the Beacon frame determines which of the three receiving links 10 The first receiving link 10 has the largest RSSI, then the gating control unit 5 controls the multiplex gating unit 3 to switch to the state shown in FIG.
  • the gating control unit 5 controls the multiplex gating unit 3 to switch to the state shown in Figure 7 , to ensure that the receiving link 10 with the maximum RSSI is connected to the energy detection unit 2; for example, when it is determined that the third receiving link 10 in the three receiving links 10 has the maximum RSSI through the RSSI of the Beacon frame, the gating control unit 5
  • the multiplexing unit 3 is controlled to switch to the state shown in FIG. 8 to ensure that the receiving link 10 with the largest RSSI is connected to the energy detecting unit 2 .
  • the correlation detection unit 15 After the signal of each receiving link 10 passes through the analog-to-digital converter 14, the correlation detection unit 15 performs correlation detection on the header part of the packet. In the case of low signal-to-noise ratio and low RSSI, the energy detection unit 2 detects the one currently connected to it. The packet header part in the receiving link 10 performs energy detection, and adjusts the AGC of each receiving link 10 according to the results of the correlation detection and energy detection. The correlation detection unit 15 can be turned off after the correlation is successful.
  • An embodiment of the present application further provides an electronic device, including the above-mentioned multiple-input multiple-output receiver for Wi-Fi.
  • Electronic devices may be mobile phones, routers, tablet computers, personal computers (PCs), personal digital assistants (PDAs), smart watches, netbooks, wearable electronic devices, augmented reality (AR) Devices, virtual reality (VR) devices, in-vehicle devices, drone devices, smart cars, smart speakers, robots, smart glasses, and more.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions when loaded and executed on a computer, result in whole or in part of the processes or functions described herein.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk), and the like.
  • “at least one” refers to one or more, and “multiple” refers to two or more.
  • “And/or”, which describes the association relationship of the associated objects means that there can be three kinds of relationships, for example, A and/or B, which can indicate the existence of A alone, the existence of A and B at the same time, and the existence of B alone. where A and B can be singular or plural.
  • the character “/” generally indicates that the associated objects are an “or” relationship.
  • “At least one of the following” and similar expressions refer to any combination of these items, including any combination of single or plural items.
  • At least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple.

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Abstract

本申请实施例提供一种用于Wi-Fi的多输入多输出接收机和电子设备，涉及通信技术领域，可以通过降低接收机中的硬件复杂程度而降低成本和功耗。用于Wi-Fi的多输入多输出接收机，包括：n个天线；能量检测单元；多路选通单元；接收链路；频偏调整单元；多路选通单元具有一个能量检测选通输出端和n-1个非能量检测选通输出端，能量检测选通输出端通过能量检测单元耦接于频偏调整单元，每个非能量检测选通输出端耦接于频偏调整单元，多路选通单元用于使每个选通输入端与一个选通输出端之间连通；选通控制单元，选通控制单元用于根据每条接收链路的信号强度控制多路选通单元使满足预设条件的一条接收链路所对应的选通输入端与能量检测选通输出端之间连通。

Description

用于Wi-Fi的多输入多输出接收机和电子设备
本申请要求于2020年12月31日提交中国专利局、申请号为202011624166.2、申请名称为“用于Wi-Fi的多输入多输出接收机和电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，特别涉及一种用于Wi-Fi的多输入多输出接收机和电子设备。
背景技术
目前的无线保真(Wireless Fidelity，WI-FI)演进过程中，从802.11n开始到802.11AC、802.11AX支持多输入多输出(multiple input multiple output，MIMO)。实际的MIMO接收机中多天线由于位置摆放不同，会造成不同天线接收到的信号的大小和信噪比不同，基于不同接收链路上的信号差异，需要具有较多硬件结构进行调节，导致成本和功耗较高。
发明内容
本申请技术方案提供了一种用于Wi-Fi的多输入多输出接收机和电子设备，可以通过降低接收机中的硬件复杂程度而降低成本和功耗。
第一方面，提供一种用于Wi-Fi的多输入多输出接收机，包括：
n个天线，n≥2；
能量检测单元；
多路选通单元；
与每个天线对应的接收链路，所述接收链路的输入端耦接于对应的天线，所述多路选通单元具有与每条所述接收链路对应的选通输入端，所述接收链路的输出端耦接于所述多路选通单元对应的选通输入端；
频偏调整单元；
所述多路选通单元具有一个能量检测选通输出端和n-1个非能量检测选通输出端，所述能量检测选通输出端通过所述能量检测单元耦接于所述频偏调整单元，每个非能量检测选通输出端耦接于所述频偏调整单元，所述多路选通单元用于使每个选通输入端与一个选通输出端之间连通；
耦接于所述多路选通单元的选通控制单元，所述选通控制单元用于周期性获取每条所述接收链路的信号强度，并且根据每条所述接收链路的信号强度控制所述多路选通单元使满足预设条件的一条所述接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
在一种可能的实施方式中，所述选通控制单元具体用于，周期性获取每条所述接收链路的信号强度，并且控制所述多路选通单元使具有最大信号强度的接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
在一种可能的实施方式中，所述选通控制单元具体用于，周期性获取每条所述接收链路的信号强度和信噪比，并且控制所述多路选通单元使具有最大信号强度且满足预设信噪比范围的接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
在一种可能的实施方式中，每条所述接收链路包括自动增益控制单元。
在一种可能的实施方式中，每条所述接收链路包括依次耦接于输入端和输出端之间的低噪声放大器、下变频单元和自动增益控制单元。
在一种可能的实施方式中，所述能量检测选通输出端依次通过模数转换器和相关检测单元耦接于所述能量检测单元；
所述非能量检测选通输出端依次通过模数转换器和相关检测单元耦接于所述频偏调整单元。
在一种可能的实施方式中，每条所述接收链路包括依次耦接于输入端和输出端之间的低噪声放大器、下变频单元、自动增益控制单元和模数转换器。
在一种可能的实施方式中，所述能量检测选通输出端通过相关检测单元耦接于所述能量检测单元；
所述非能量检测选通输出端通过相关检测单元耦接于所述频偏调整单元。
在一种可能的实施方式中，每条所述接收链路包括依次耦接于输入端和输出端之间的低噪声放大器、下变频单元、自动增益控制单元、模数转换器和相关检测单元。
在一种可能的实施方式中，所述选通控制单元具体用于，周期性获取每条所述接收链路的信标Beacon帧的接收的信号强度指示RSSI，并且控制所述多路选通单元使具有最大RSSI的接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
在一种可能的实施方式中，用于Wi-Fi的多输入多输出接收机还包括：符号定时同步单元，耦接于所述频偏调整单元。
第二方面，提供一种电子设备，包括上述的用于Wi-Fi的多输入多输出接收机。
本申请实施例中的用于Wi-Fi的多输入多输出MIMO接收机，通过多路选通单元和选通控制单元的控制，可以根据信号强度使满足预设条件的一条接收链路切换至连通能量检测单元，使能量检测单元可以仅对满足信号强度条件的接收链路进行能量检测，从而无需对应每条接收链路均设置对应的能量检测单元，减少了能量检测单元的数量，即降低了接收机中的硬件复杂程度，降低了成本和功耗。本申请实施例中接收机的接收链路切换过程可以于物理层实现，此时则不需要软件参与；由于可以只保留一条接收链路具有能量检测，因此可以节省系统级芯片(System on Chip，SOC)的面积，降低功耗；保证最大信号强度的接收链路进行能量检测，以优化信号接收性能。
附图说明
图1为一种用于Wi-Fi的MIMO接收机的结构框图；
图2为本申请实施例中一种用于Wi-Fi的MIMO接收机的结构框图；
图3为图2中接收机的另一种状态示意图；
图4为本申请实施例中另一种用于Wi-Fi的MIMO接收机的结构框图；
图5为本申请实施例中另一种用于Wi-Fi的MIMO接收机的结构框图；
图6为本申请实施例中另一种用于Wi-Fi的MIMO接收机的结构框图；
图7为图6中接收机的另一种状态示意图；
图8为图6中接收机的另一种状态示意图。
具体实施方式
本申请的实施方式部分使用的术语仅用于对本申请的具体实施例进行解释，而非旨在限定本申请。在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。应当理解，在本申请实施例的描述中，“耦接”包括直接连接或通过耦合的方式间接连接。
首先对本申请所涉及的电子设备进行介绍，本申请所涉及的电子设备可能为手机、路由器、平板电脑、个人计算机(personal computer，PC)、个人数字助理(personal digital assistant，PDA)、智能手表、上网本、可穿戴电子设备、增强现实技术(augmented reality，AR)设备、虚拟现实(virtual reality，VR)设备、车载设备、无人机设备、智能汽车、智能音响、机器人、智能眼镜等等。电子设备包括接收机，用于与另外的电子设备进行无线通信。本申请所涉及的接收机为用于Wi-Fi的MIMO接收机。
MIMO是指使用多个发射天线和多个接收天线的无线通信技术，如图1所示，图1为一种用于Wi-Fi的MIMO接收机的结构框图，接收机包括多个天线01，每个天线01对应一条接收链路001，接收链路011包括低噪声放大器02(low noise amplifier，LNA)、下变频单元03、自动增益控制(Automatic Gain Control，AGC)单元04、模数转换器05(Analog-to-Digital Converter，ADC)、检测单元06，接收链路011的输入端耦接于对应的天线01，接收链路011的输出端耦接于频偏调整单元07，频偏调整单元07耦接于符号定时同步单元08。其中，为了使每条接收链路011获得最大的动态范围，每条接收链路011需要单独调制AGC，每条接收链路011的信号经过ADC转换为数字信号之后，需要通过检测单元06做相关检测和能量检测，根据相关检测和能量检测的结果，对每条接收链路011进行AGC的调整，综合AGC调整后的多条接收链路011的能量检测或相关检测的结果，通过频偏调整单元07进行频偏调整，通过符号定时同步单元08进行符号定时同步调整，根据AGC调整后接收到的信号的幅度和信噪比、以及频偏调整和符号定时同步之后，解出信号，进行后续数据包的解调。随着接收机吞吐率的提升需求，天线01和接收链路011的数量越来越多，每条接收链路011所需要的硬件和功耗资源成倍数增加，例如，对于每一条接收链路011，均需要在信号较弱时通过检测单元06进行能量检测，因此，图1中所示的MIMO接收机具有较多硬件结构，导致成本和功耗较高。
为解决上述问题，本申请实施例提供了一种用于Wi-Fi的多输入多输出MIMO接收机，如图2所示，接收机包括：n个天线1，n≥2；能量检测单元2；多路选通单元3，多路选通单元3；与每个天线1对应的接收链路10，接收链路10的输入端耦接于对应的天线1，多路选通单元3具有与每条接收链路10对应的选通输入端IN，接收链路10的输出端耦接于多路选通单元3对应的选通输入端IN；频偏调整单元4；多路选通单元3具有一个能量检测选通输出端OE和n-1个非能量检测选通输出端ON，能量检测选通输出端OE通过能量检测单元2耦接于频偏调整单元4，每个非能量检测选通输出端ON耦接于频偏调整单元4，多路选通单元3用于使每个选通输入端IN与一个选通输出端之间连通；耦接于多路选通单元3的选通控制单元5，选通控制单元5用于周期性获取每条接收链路10的信号强度，并且根据每条接收链路10的信号强度控制多路选通单元3使满足预设条件的一条接收链路10所对应的选通输入端IN与能量检测选通输出端OE之间连通。
具体地，接收链路10用于对通过天线1接收到的信号进行处理，处理之后的信号通过能量检测单元2传输至频偏调整单元4，或者处理之后的信号直接传输至频偏调整单元4，也就是说，在频偏调整单元4和任意非能量检测选通输出端ON之间均没有设置能量检测单元，即只有一条接收链路10的输出信号会经过能量检测单元2，其他接收链路10的输出信号直接传输至频偏调整单元4。多路选通单元3用于使接收链路10的输出端连通至频偏调整单元4，其中，只有一路接收链路10的输出端通过能量检测单元2连通至频偏调整单元4，其他路接收链路10的输出端在不经过能量检测单元的情况下连通至频偏调整单元4，也就是说，能量检测单元2仅对一条接收链路10的输出信号进行能量检测，能量检测单元2会在检测到接收信号的信噪比和接收的信号强度指示(Received Signal Strength Indication，RSSI)低于阈值时开启，进行能量检测。以n＝2为例，即接收机包括两个天线1和两个接收链路10为例，多路选通单元3具有两种选通状态，在第一选通状态下，如图2所示，第一条接收链路10所对应的选通输入端IN连通至能量检测选通输出端OE，第二条接收链路10所对应的选通输入端IN连通至非能量检测选通输出端ON，也就是说，在第一选通状态下，能量检测单元2仅会检测第一条接收链路10的信号，而不会检测第二条接收链路10的信号；在第二选通状态下，如图3所示，第一条接收链路10所对应的选通输入端IN连通至非能量检测选通输出端ON，第二条接收链路10所对应的选通输入端IN连通至能量检测选通输出端OE，也就是说，在第二选通状态下，能量检测单元2仅会检测第二条接收链路10的信号，而不会检测第一条接收链路10的信号。选通控制单元5可以控制多路选通单元3在第一选通状态和第二选通状态之间切换。选通控制单元5会周期性获取每一条接收链路10的信号强度，并且根据信号强度选择满足预设条件的一条接收链路10，并控制满足预设条件的一条接收链路10连通至能量检测单元2，例如，多路选通单元3当前处于第一选通状态，此时，选通控制单元5通过对每条接收链路10中信号强度的判断发现第二条接收链路10的信号强度大于第一条接收链路10，此时，选通控制单元5会控制多路选通单元3切换至第二选通状态，即将具有最大信号强度的第二条接收链路10切换至连通能量检测单元2，使得接下来能量检测单元2对最大信号强度的接收链路10进行能量检测，以实现可 以基于能量检测结果进行更加有效的频偏调整等处理，以实现优化信号接收性能的目的。
本申请实施例中的用于Wi-Fi的多输入多输出MIMO接收机，通过多路选通单元和选通控制单元的控制，可以根据信号强度使满足预设条件的一条接收链路切换至连通能量检测单元，使能量检测单元可以仅对满足信号强度条件的接收链路进行能量检测，从而无需对应每条接收链路均设置对应的能量检测单元，减少了能量检测单元的数量，即降低了接收机中的硬件复杂程度，降低了成本和功耗。本申请实施例中接收机的接收链路切换过程可以于物理层实现，此时则不需要软件参与；由于可以只保留一条接收链路具有能量检测，因此可以节省系统级芯片(System on Chip，SOC)的面积，降低功耗；保证最大信号强度的接收链路进行能量检测，以优化信号接收性能。
在一种可能的实施方式中，选通控制单元5具体用于，周期性获取每条接收链路10的信号强度，并且控制多路选通单元3使具有最大信号强度的接收链路10所对应的选通输入端IN与能量检测选通输出端OE之间连通。
在一种可能的实施方式中，选通控制单元5具体用于，周期性获取每条接收链路10的信号强度和信噪比(Signal Noise Ratio，SNR)，并且控制多路选通单元3使具有最大信号强度且满足预设信噪比范围的接收链路10所对应的选通输入端IN与能量检测选通输出端OE之间连通。
具体地，一般情况下，信号强度越大，信噪比也越大，因此，设置一个可接受的信噪比范围，当确定某条接收链路10具有最大的信号强度后，参考SNR，如果SNR在预设范围内，即噪声较小，则将该条接收链路10切换至连通能量检测单元2，假设某条接收链路10具有最大的信号强度，但是SNR超出了预设范围，即说明该条接收链路10上的信号可能是由于干扰而导致的强度较大，因此即便信号强度最大，由于SNR不满足预设范围，此时也不进行切换。
在一种可能的实施方式中，每条接收链路10包括自动增益控制AGC单元11，即可以在每条接收链路10中进行AGC调整之后的信号进行上述切换，每条接收链路10具有单独调整的AGC，可以使每条接收链路10具有最大的动态范围。
在一种可能的实施方式中，每条接收链路10包括依次耦接于输入端和输出端之间的低噪声放大器12、下变频单元13和自动增益控制单元11。
在一种可能的实施方式中，如图4所示，能量检测选通输出端OE依次通过模数转换器14和相关检测单元15耦接于能量检测单元2；非能量检测选通输出端ON依次通过模数转换器14和相关检测单元15耦接于频偏调整单元4。也就是说，仅将模数转换器14之前的射频部分作为接收链路10作为可切换的部分，在接收链路10切换之后再通过模数转换器14进行模数转换以及通过相关检测单元15进行相关检测，其中，在相关成功之后，相关检测单元15可以关闭，关闭之后的相关检测单元15仅仅是不再进行相关检测，但是并不会影响经过的信号，使经过模数转换器14和相关检测单元15的信号进行能量检测。
在一种可能的实施方式中，如图2和图5所示，每条接收链路10包括依次耦接于输入端和输出端之间的低噪声放大器12、下变频单元13、自动增益控制单元11和 模数转换器14。也就是说，在每条接收链路10中信号经过模数转换器14之后，可以在多路选通单元3进行切换。
在一种可能的实施方式中，如图5所示，能量检测选通输出端OE通过相关检测单元15耦接于能量检测单元2；非能量检测选通输出端ON通过相关检测单元15耦接于频偏调整单元4。
在一种可能的实施方式中，如图2和图3所示，每条接收链路10包括依次耦接于输入端和输出端之间的低噪声放大器12、下变频单元13、自动增益控制单元11、模数转换器14和相关检测单元15。也就是说，在每条接收链路10中信号经过模数转换器14和相关检测单元15之后，可以在多路选通单元3进行切换。
在一种可能的实施方式中，选通控制单元5具体用于，周期性获取每条接收链路10的信标Beacon帧的接收的信号强度指示RSSI，并且控制多路选通单元3使具有最大RSSI的接收链路10所对应的选通输入端与能量检测选通输出端OE之间连通。也就是说，可以通过RSSI的大小来确定各接收链路10的信号强度，并以此作为依据来控制多路选通单元3的切换。
在一种可能的实施方式中，接收机还包括：符号定时同步单元6，耦接于频偏调整单元4。
以上仅以n＝2为例进行了说明，以下通过n＝3为例对本申请实施例进行说明，如图6、图7和图8所示，当n＝3时，多路选通单元3具有三个选通输入端IN、一个能量检测选通输出端OE和两个非能量检测选通输出端ON。每条接收链路10具有单独调制的自动增益控制AGC单元11，多条接收链路10可以通过多路选通单元3进行切换，例如，当通过Beacon帧的RSSI确定三条接收链路10中的第一条接收链路10具有最大的RSSI，则选通控制单元5控制多路选通单元3切换至如图6所示的状态，保证具有最大RSSI的接收链路10连通至能量检测单元2；例如当通过Beacon帧的RSSI确定三条接收链路10中的第二条接收链路10具有最大的RSSI，则选通控制单元5控制多路选通单元3切换至如图7所示的状态，保证具有最大RSSI的接收链路10连通至能量检测单元2；例如当通过Beacon帧的RSSI确定三条接收链路10中的第三条接收链路10具有最大的RSSI，则选通控制单元5控制多路选通单元3切换至如图8所示的状态，保证具有最大RSSI的接收链路10连通至能量检测单元2。每一条接收链路10的信号经过模数转换器14之后，对包头部分通过相关检测单元15进行相关检测，在低信噪比和低RSSI的情况下，能量检测单元2对当前与其连通的一条接收链路10中的包头部分进行能量检测，根据相关检测和能量检测的结果，对每条接收链路10进行AGC的调整，相关检测单元15在相关成功之后可以关闭。综合AGC调整后的多条接收链路的能量检测或相关检测的结果，通过频偏调整单元4频偏调整，通过符号定时同步单元6进行符号定时同步，根据AGC调整后接收的信号幅度和SNR，以及频偏调整和符号定时同步之后，解出信号，进行后续数据包的解调。
本申请实施例还提供一种电子设备，包括上述的用于Wi-Fi的多输入多输出接收机。其中，接收机的具体结构和原理与上述实施例相同，在此不再赘述。电子设备可能为手机、路由器、平板电脑、个人计算机(personal computer，PC)、个人数字助 理(personal digital assistant，PDA)、智能手表、上网本、可穿戴电子设备、增强现实技术(augmented reality，AR)设备、虚拟现实(virtual reality，VR)设备、车载设备、无人机设备、智能汽车、智能音响、机器人、智能眼镜等等。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk)等。
本申请实施例中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，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的情况。其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项”及其类似表达，是指的这些项中的任意组合，包括单项或复数项的任意组合。例如，a，b和c中的至少一项可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种用于Wi-Fi的多输入多输出接收机，其特征在于，包括：
    n个天线，n≥2；
    能量检测单元；
    多路选通单元；
    与每个天线对应的接收链路，所述接收链路的输入端耦接于对应的天线，所述多路选通单元具有与每条所述接收链路对应的选通输入端，所述接收链路的输出端耦接于所述多路选通单元对应的选通输入端；
    频偏调整单元；
    所述多路选通单元具有一个能量检测选通输出端和n-1个非能量检测选通输出端，所述能量检测选通输出端通过所述能量检测单元耦接于所述频偏调整单元，每个非能量检测选通输出端耦接于所述频偏调整单元，所述多路选通单元用于使每个选通输入端与一个选通输出端之间连通；
    耦接于所述多路选通单元的选通控制单元，所述选通控制单元用于周期性获取每条所述接收链路的信号强度，并且根据每条所述接收链路的信号强度控制所述多路选通单元使满足预设条件的一条所述接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
  2. 根据权利要求1所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    所述选通控制单元具体用于，周期性获取每条所述接收链路的信号强度，并且控制所述多路选通单元使具有最大信号强度的接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
  3. 根据权利要求1所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    所述选通控制单元具体用于，周期性获取每条所述接收链路的信号强度和信噪比，并且控制所述多路选通单元使具有最大信号强度且满足预设信噪比范围的接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
  4. 根据权利要求1所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    每条所述接收链路包括自动增益控制单元。
  5. 根据权利要求4所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    每条所述接收链路包括依次耦接于输入端和输出端之间的低噪声放大器、下变频单元和自动增益控制单元。
  6. 根据权利要求5所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    所述能量检测选通输出端依次通过模数转换器和相关检测单元耦接于所述能量检测单元；
    所述非能量检测选通输出端依次通过模数转换器和相关检测单元耦接于所述频偏调整单元。
  7. 根据权利要求5所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    每条所述接收链路包括依次耦接于输入端和输出端之间的低噪声放大器、下变频单元、自动增益控制单元和模数转换器。
  8. 根据权利要求7所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    所述能量检测选通输出端通过相关检测单元耦接于所述能量检测单元；
    所述非能量检测选通输出端通过相关检测单元耦接于所述频偏调整单元。
  9. 根据权利要求5所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    每条所述接收链路包括依次耦接于输入端和输出端之间的低噪声放大器、下变频单元、自动增益控制单元、模数转换器和相关检测单元。
  10. 根据权利要求1所述的用于Wi-Fi的多输入多输出接收机，其特征在于，
    所述选通控制单元具体用于，周期性获取每条所述接收链路的信标Beacon帧的接收的信号强度指示RSSI，并且控制所述多路选通单元使具有最大RSSI的接收链路所对应的选通输入端与所述能量检测选通输出端之间连通。
  11. 根据权利要求1所述的用于Wi-Fi的多输入多输出接收机，其特征在于，还包括：
    符号定时同步单元，耦接于所述频偏调整单元。
  12. 一种电子设备，其特征在于，包括如权利要求1至11中任意一项所述的用于Wi-Fi的多输入多输出接收机。
PCT/CN2021/131006 2020-12-31 2021-11-16 用于Wi-Fi的多输入多输出接收机和电子设备 Ceased WO2022142806A1 (zh)

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