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CN-121984551-A - Antenna switching circuit and Wifi radio frequency parameter algorithm design method

CN121984551ACN 121984551 ACN121984551 ACN 121984551ACN-121984551-A

Abstract

The invention relates to the technical field of wireless transmission, in particular to an antenna switching circuit and a design method of a Wifi radio frequency parameter algorithm. The wireless communication device comprises a radio frequency switch, wherein the radio frequency switch is provided with a radio frequency input port for receiving Wifi 2.4G, 5G or 6G signals and a control port for being electrically connected with a GPIO port of a CPU to receive control signals sent by the CPU so as to switch a radio frequency channel. According to the invention, the antenna switching circuit comprising the radio frequency switch is designed, so that the flexible switching of the Wifi signal between different radio frequency paths is realized, and the design is duplicated by other links of the MIMO link, so that the consistency of multi-link switching is ensured. According to the method, a Wifi radio frequency parameter algorithm is combined, an original calibration parameter is firstly generated aiming at a path with the largest insertion loss as a basis, then multi-state correction parameters are generated aiming at other paths according to characteristics such as link insertion loss and reflection indexes, and when the radio frequency paths are switched, the corresponding correction parameters are called, so that the optimal matching of radio frequency parameters of different paths is realized.

Inventors

  • GAO LEI
  • SUN HAILONG
  • ZHU MIN
  • ZHANG JIAO

Assignees

  • 太仓市同维电子有限公司
  • 东南大学

Dates

Publication Date
20260505
Application Date
20260122

Claims (10)

  1. 1. The antenna switching circuit is characterized by comprising a radio frequency switch, wherein the radio frequency switch is provided with a radio frequency input port used for receiving Wifi 2.4G, 5G or 6G signals, a control port used for being electrically connected with a GPIO port of a CPU to receive control signals sent by the CPU so as to switch radio frequency channels, and at least two radio frequency output ports used for being electrically connected with antennas corresponding to the radio frequency channels one by one respectively, one radio frequency output port corresponds to an antenna of a default radio frequency channel, the other radio frequency output port corresponds to an antenna of the radio frequency channel after switching, and other links of a MIMO link are identical to the electrical connection between the radio frequency switch and the antenna.
  2. 2. The antenna switching circuit of claim 1 wherein the radio frequency switch is an SPDT switch, the radio frequency input port of the SPDT switch receives a single frequency Wifi signal, the control signal controls the SPDT switch to switch the single frequency Wifi signal to either a first radio frequency output port corresponding to ANT1 of a default radio frequency path or a second radio frequency output port corresponding to ANT2 of a switched radio frequency path.
  3. 3. The antenna switching circuit of claim 1 wherein the radio frequency switch is a DPDT switch, the first radio frequency input port and the second radio frequency input port of the DPDT switch respectively receive Wifi signals at different frequencies, the control signal controls the DPDT switch to switch the Wifi signals at different frequencies to a third radio frequency output port or a fourth radio frequency output port, the third radio frequency output port corresponds to an antenna array of a default radio frequency path, and the fourth radio frequency output port corresponds to an antenna array of a switched radio frequency path.
  4. 4. A Wifi radio frequency parameter algorithm design method applied to the antenna switching circuit according to any one of claims 1-3, characterized by comprising the following steps: Performing standard TX power calibration on a path with the largest insertion loss in Wifi 2.4G, 5G or 6G radio frequency hardware paths to generate original calibration parameters, wherein the original calibration parameters are basic parameters of a default state (Case 0); Aiming at other radio frequency paths, carrying out power correction on the basis of the original calibration parameters according to link insertion loss and reflection indexes of other radio frequency paths to generate multi-state correction parameters of cases 1 to CaseN, wherein the correction parameters comprise numerical values of constant, increased or decreased power; When the radio frequency channel is switched, the correction parameters corresponding to the Case are called to match the radio frequency parameters of the switched radio frequency channel.
  5. 5. The Wifi radio frequency parameter algorithm design method according to claim 4, wherein the original calibration parameter corresponds to a Case0 state, and correction parameters of all MIMO links of 2.4G, 5G or 6G in the Case0 state are all 0, and the original calibration parameter is used for guaranteeing the radio frequency path to be consistent.
  6. 6. The method for designing a Wifi radio frequency parameter algorithm according to claim 4, wherein the first bit of the correction parameter indicates a Case number, the second bit indicates a frequency band, wherein 2.4G corresponds to 1,5G and 2,6G corresponds to 3, the third bit of the correction parameter indicates a MIMO Link number, wherein Link1 corresponds to 1, link2 corresponds to 2, link3 corresponds to 3, link4 corresponds to 4, the correction parameter is a value from-20 to 20, the minimum scale is 0.1dB, wherein a positive value indicates increasing TX power, a negative value indicates decreasing TX power, and 0 indicates constant power.
  7. 7. The method for designing Wifi radio frequency parameter algorithm according to claim 6, wherein the correction parameters of the Case1 state satisfy that all MIMO links of 2.4G are not switched, the correction parameters are all 0, all MIMO links of 5G are switched from a default path to other paths, the correction parameters are Link1 increased by 1.1dB, link2 increased by 0.8dB, link3 increased by 0.6dB, link4 decreased by 0.3dB, link1 and Link2 of 6G are not switched, the correction parameters are 0, link3 and Link4 are switched to other paths, the correction parameters are Link3 decreased by 0.6dB, and Link4 increased by 0.5dB.
  8. 8. The method for designing a Wifi radio frequency parameter algorithm according to claim 4, wherein when the software upper layer determines that the application scenario meets a Case trigger condition, the CPU sends an instruction to the bottom layer to call a correction parameter corresponding to the Case, and the application scenario includes at least one of the number of access devices, a signal coverage requirement and an anti-interference requirement.
  9. 9. The Wifi radio frequency parameter algorithm design method according to claim 4, wherein Link1 to Link4 of each MIMO Link of 2.4G, 5G or 6G can be switched from ANT1 of a default path to ANT2 of other paths, the default path corresponding to an original calibration parameter in Case0 state, and the other paths corresponding to correction parameters in Case1 to CaseN states.
  10. 10. The method for designing Wifi radio frequency parameter algorithm according to claim 4, wherein the design of the correction parameters is used to optimize signal quality and throughput of the switched radio frequency path, the signal quality includes TX power matching, link insertion loss compensation, and reflection index optimization, the throughput optimization is achieved by adjusting power allocation of the MIMO link, and the power allocation is dynamically adjusted according to link state of the MIMO link.

Description

Antenna switching circuit and Wifi radio frequency parameter algorithm design method Technical Field The invention relates to the technical field of wireless transmission, in particular to an antenna switching circuit and a design method of a Wifi radio frequency parameter algorithm. Background With the rapid development of global internet technology and digitization, users are increasingly in need of high-speed, stable, intelligent network connection. As the Wifi of the wireless local area network technology is currently preferred, the Wifi needs to have larger capacity and stronger signal coverage, and meanwhile, the challenges of technology iteration innovation, user demand diversification and the like are to be met. Therefore, new Wifi technical standards with higher transmission rate, lower delay and stronger anti-interference capability are required to be continuously introduced, and the optimal configuration of Wifi wireless resources is realized. The continuous evolution of Wifi technology needs to solve the problems of wireless air interface intellectualization, signal coverage, high-speed transmission, communication equipment cost and the like. The IEEE 802.11BE/BN (Wifi 7/Wifi 8) standards all support three frequencies 2.4G/5G/6G.802.11BE, supporting MLO multi-link operation, multiple input multiple output (MU-MIMO), intelligent optimization of scenarios (smart antennas). The 802.11BN adds coordinated spatial reuse (Co-SR) ‌, coordinated beamforming (Co-BF), dynamic Subchannel Operation (DSO) functions on an 802.11BE basis. The existing Wifi7/Wifi8 standards support intelligent antennas, and Wifi equipment such as AP, PON, CPE with intelligent antenna switching function can cover more areas, increase communication capacity and speed, reduce electromagnetic interference, reduce communication networking cost and improve product competitiveness. However, how to ensure the optimal matching of the calibration parameters of different radio frequency channels after the antenna is switched becomes a great difficulty in restricting the application of the intelligent antenna. For example, when the number of access devices is large, wifi needs to be switched to a high gain antenna path in order to enhance signal coverage, throughput, and interference immunity. The path change needs the matched radio frequency parameters, so the corresponding Wifi radio frequency parameters need to be called to ensure the signal quality. Disclosure of Invention The disclosure provides an antenna switching circuit and a Wifi radio frequency parameter algorithm design method, which aim to overcome at least one defect existing in the prior art. In order to achieve the above purpose, the technical scheme disclosed by the invention is as follows: according to one aspect of the disclosure, an antenna switching circuit is provided, which comprises a radio frequency switch, wherein the radio frequency switch is provided with a radio frequency input port for receiving Wifi 2.4G, 5G or 6G signals, a control port for being electrically connected with a GPIO port of a CPU to receive a control signal sent by the CPU so as to switch a radio frequency channel, and at least two radio frequency output ports for being electrically connected with antennas corresponding to the radio frequency channels one by one respectively, one radio frequency output port corresponds to an antenna of a default radio frequency channel, the other radio frequency output port corresponds to an antenna of the switched radio frequency channel, and other links of a MIMO link are the same as the electrical connection between the radio frequency switch and the antenna. Furthermore, the radio frequency switch is an SPDT switch, the radio frequency input port of the SPDT switch receives a single frequency Wifi signal, the control signal controls the SPDT switch to switch the single frequency Wifi signal to a first radio frequency output port or a second radio frequency output port, the first radio frequency output port corresponds to ANT1 of a default radio frequency channel, and the second radio frequency output port corresponds to ANT2 of a switched radio frequency channel. Further, the radio frequency switch is a DPDT switch, the first radio frequency input port and the second radio frequency input port of the DPDT switch respectively receive Wifi signals with different frequencies, the control signal controls the DPDT switch to switch the Wifi signals with different frequencies to a third radio frequency output port or a fourth radio frequency output port, the third radio frequency output port corresponds to an antenna array of a default radio frequency channel, and the fourth radio frequency output port corresponds to an antenna array of a switched radio frequency channel. According to another aspect of the present disclosure, a Wifi radio frequency parameter algorithm design method is provided, which is applied to an antenna switching circuit as described above, a