WO2012092829A1 - 多频段天线自动调谐阻抗匹配的方法及终端设备 - Google Patents

多频段天线自动调谐阻抗匹配的方法及终端设备 Download PDF

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Publication number
WO2012092829A1
WO2012092829A1 PCT/CN2011/085068 CN2011085068W WO2012092829A1 WO 2012092829 A1 WO2012092829 A1 WO 2012092829A1 CN 2011085068 W CN2011085068 W CN 2011085068W WO 2012092829 A1 WO2012092829 A1 WO 2012092829A1
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WO
WIPO (PCT)
Prior art keywords
antenna
impedance matching
logic control
power
value
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Application number
PCT/CN2011/085068
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English (en)
French (fr)
Inventor
雷刚
Original Assignee
意法·爱立信半导体(北京)有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 意法·爱立信半导体(北京)有限公司 filed Critical 意法·爱立信半导体(北京)有限公司
Priority to EP11854857.7A priority Critical patent/EP2662930A4/en
Priority to US13/977,048 priority patent/US9160395B2/en
Publication of WO2012092829A1 publication Critical patent/WO2012092829A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02Transmitters
    • H04B1/04Circuits
    • H04B1/0458Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0251Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/18Input circuits, e.g. for coupling to an antenna or a transmission line
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a terminal device for automatically tuning impedance matching of a multi-band antenna. Background technique
  • the terminal device uses only the same antenna, it is necessary to cover multiple frequency bands and only use the same set of matching devices. It is necessary to cause the antenna to be mismatched in certain frequency bands, and the change of the surrounding environment is also likely to cause antenna mismatch. These mismatches can cause a series of problems such as excessive power consumption and reduced antenna sensitivity, which can affect the standby time of the terminal equipment and the signal quality of continuous calls.
  • an object of the present invention is to provide a method and a terminal device for automatically tuning impedance matching of a multi-band antenna, which can improve the impedance matching efficiency of the antenna in multi-band operation, and further save power under the premise of ensuring antenna performance.
  • the present invention provides a method for automatically tuning impedance matching of a multi-band antenna, the method comprising:
  • a logic control parameter for controlling the antenna tuner is obtained, and the impedance matching of the antenna is adjusted by using the logic control parameter.
  • the obtaining a control signal for controlling the antenna tuner is adjusted by using logic control parameters
  • the step of impedance matching of the antenna includes:
  • the logic control parameter of the antenna tuner is changed, and the working current value of the power amplifier during the adjustment process is recorded; when the working current value is selected to be the smallest, corresponding The logic control parameter of the antenna tuner; controlling the antenna tuner to change the internal series-parallel capacitance according to the selected logic control parameter to adjust the impedance matching of the antenna.
  • the method further includes:
  • the operating current value and the output power value of the power amplifier are detected.
  • the method further includes:
  • a period in which the operating current value and the output power value are cyclically detected is set in advance.
  • the method further includes:
  • the control antenna tuner is switched within an adjustable range, and the received power value of the received signal during the adjustment process is recorded;
  • the antenna tuner is controlled to change the internal series-parallel capacitance according to the selected logic control parameters to adjust the impedance matching of the antenna.
  • the present invention provides a terminal device, including:
  • a transceiver for receiving and transmitting signals
  • a power amplifier coupled to the transceiver, for amplifying the power of the transmitted signal
  • a current detector coupled to the power amplifier for obtaining an operating current value of a current consumed by the power amplifier during operation
  • a power coupler coupled to the power amplifier for obtaining an output power value at an output of the power amplifier
  • a digital baseband processor coupled to the current detector, configured to obtain a logic control parameter for controlling the antenna tuner according to the operating current value and the output power value;
  • An antenna tuner is coupled to the digital baseband processor for utilizing the logic control parameters to adjust impedance matching of the antenna.
  • the digital baseband processor is further configured to control the antenna tuner in an adjustable range Intra-switching, recording the received power value of the received signal during the adjustment; and selecting the logic control parameter when the received power is maximum to control the antenna tuner to change the internal series-parallel capacitor to adjust the impedance matching of the antenna.
  • the terminal device further includes:
  • An analog baseband processor is coupled to the digital baseband processor and the transceiver, respectively, for processing analog signals.
  • the terminal device further includes:
  • An antenna switch module is respectively connected to the power coupler and the antenna tuner for switching signals of different paths to the antenna.
  • the terminal device further includes:
  • a low noise amplifier is respectively connected to the transceiver and the antenna switch module for reducing noise interference in the received signal.
  • the embodiments of the present invention have the following beneficial effects: firstly, the working current value and the output power value of the power amplifier when the signal is transmitted; and then obtaining the control antenna tuner according to the working current value and the output power value.
  • Logic control parameters using logic control parameters to adjust the impedance matching of the antenna. Therefore, the performance of the existing antenna when operating at different frequencies can be improved, and the effect of saving power and ensuring communication quality can be achieved.
  • FIG. 1 is a flow chart of a method for automatically tuning impedance matching of a multi-band antenna according to an embodiment of the present invention
  • FIG. 2 is a flowchart of receiving loops of an antenna tuner in a Band 38 band according to an embodiment of the present invention
  • FIG. 3 is an embodiment of the present invention
  • FIG. 4 is a structural block diagram of a terminal device in an embodiment of the present invention
  • FIG. 5 is a schematic diagram of the antenna tuner of Figure 4 in accordance with an embodiment of the present invention. detailed description
  • a logic control parameter for controlling the antenna tuner is obtained, and the logic control parameter is used to adjust the impedance matching of the antenna, so that the antenna tuner is Maximize antenna performance within the scope of work, Thereby optimizing the performance and power consumption of the entire terminal device.
  • a flow chart of a method for automatically tuning impedance matching of a multi-band antenna in an embodiment of the present invention is as follows:
  • Step 101 Obtain an operating current value of the power amplifier when transmitting the signal, and send the working current value to the digital baseband processor;
  • a current detector is disposed at the power terminal of the power amplifier, and the current detector can detect the working current value of the current consumed by the power amplifier when transmitting the signal by using the time detection method, and send the working current value to the digital baseband.
  • a processor DBB to record the operating current value of the current consumed in different states.
  • Step 102 Obtain an output power value at a power amplifier output, and send the output power value to the DBB;
  • a power coupler is disposed at the output end of the power amplifier, and the power coupler can detect the output power value at the output of the power amplifier by using the time detection method, and send the output power value to the DBB to record in different states. Output power value.
  • Step 103 Obtain a logic control parameter for controlling the antenna tuner according to the working current value and the output power value, and adjust the impedance matching of the antenna by using the logic control parameter.
  • the above impedance matching refers to a specific matching relationship between the load impedance and the internal impedance of the signal during signal transmission.
  • the logic control parameter of the antenna tuner can be changed, and the working current value of the power amplifier during the adjustment process is recorded;
  • the antenna tuner is controlled to change the internal series-parallel capacitance to achieve the purpose of adjusting the impedance matching of the antenna.
  • the DBB controls the antenna tuner to switch within the adjustable range, at this time, the recording power amplifier is in the adjustment process.
  • Working current value select the logic control parameter of the corresponding antenna tuner when the working current is minimum, and control the serial-parallel capacitance value of the antenna tuner according to the selected logic control parameter.
  • the preferred embodiment is as follows: a current detector is arranged on the power amplifier (PA) input power supply, and the current consumption current (operating current value) of the power amplifier during operation is monitored, and the obtained result is output to the DBB; A power coupler is arranged at the power output end of the power amplifier, and the power level (output power value) of the signal emitted by the power amplifier is monitored from time to time, and the obtained result is output to the DBB.
  • the DBB determines the current demand according to the current value and the output power value.
  • the power value of the received signal is detected from time to time, and the connected state is maintained.
  • the DBB controls the antenna tuner to switch within the adjustable range, records the power value of the received signal during the adjustment process, and selects the logic when the received power is maximum.
  • the control parameters control the antenna tuner to change the internal series-parallel capacitance according to the selected logic control parameters to adjust the impedance matching of the antenna.
  • the logic control parameters of the antenna tuner can only change the value of the series-parallel capacitor within a certain range.
  • the capacitance change in series can be from lpF to 10pF
  • the capacitance change in parallel can be from lpF to 10pF.
  • a loop detection period can be set according to the traffic volume of the platform during operation, so that the impedance adaptation can be performed in a timely manner to ensure the effective transmission of the data service when the environment around the antenna changes.
  • the receiving mode is set to the encoding mode MCS16 according to the current working environment, the coding redundancy is more, the network environment requirements are lower, and the automatic cycle detection period is Tl.
  • the platform works in the coding mode of MCS20, its coding redundancy is less, and the network environment is more demanded.
  • the automatic cycle detection period is set to ⁇ 2, ⁇ 1 > ⁇ 2 ⁇ .
  • Embodiments of the present invention can adjust the parameters of the antenna tuner to improve antenna performance in both transmit and receive directions.
  • the TD-LTE terminal devices operating at Band38 and Band40 are taken as examples for transmitting and receiving, respectively, how to improve the antenna performance for the embodiment of the present invention. Line introduction.
  • the transceiver starts to work.
  • the base station signal received by the antenna port is received, and the level value is detected and reported to the DBB.
  • the antenna tuner is controlled to perform impedance matching change, and the next working time slot is again level-detected.
  • the antenna tuner controllable impedance matching is all tested once, and the power of each received signal is recorded. Value, select the impedance matching when the received signal power is maximum, and lock the logic control parameter of the antenna tuner at this time, and use this matching value every time after receiving the frequency point in the period until the next cycle starts. , repeat the above matching process.
  • the process of determining the optimal antenna impedance matching value is directly performed without going through a specific cycle.
  • FIG. 2 is a flow chart of an antenna tuner receiving a loop in a Band 38 band according to an embodiment of the present invention, the specific steps are as follows:
  • Step 201 The receiver starts to work in the Band38 band
  • Step 202 Adjust impedance matching controllable by the antenna tuner
  • Step 203 Record a power value of the received signal obtained during the adjustment process
  • Step 204 Select impedance matching when the received signal power is maximum
  • Step 205 Lock logic control parameters of the antenna tuner at this time
  • Step 206 Send a control signal to lock the impedance matching value of the antenna tuner.
  • step 206 After performing step 206, after the next cycle or band switching, the process returns to step 201.
  • the surrounding environment in which the terminal device works changes, the impact on the antenna transmission performance is relatively large. Therefore, it is necessary to set an appropriate duty cycle according to the amount of data during operation, so that the matching of the antenna end can be timely according to changes in the environment. Adjustment.
  • the working time slot power amplifier PA
  • the power coupler detects the power from the power amplifier, and performs closed-loop control to enable the transceiver to adjust the output power to meet the current The system's demand for output power.
  • the current value in the working state is recorded and reported to the DBB.
  • control the antenna tuner in the idle time slot The line impedance matching changes, and the current working time is detected again in the next working time slot. In this cycle, all the impedance matching that can be controlled by the antenna tuner is tested once, and the value of each emission level is recorded, and the impedance matching when the current value is the smallest is selected.
  • the logic control voltage of the antenna tuner is locked at this time, and the impedance matching value is used every time the frequency is transmitted in the period, until the beginning of the next cycle, the above matching process is repeated.
  • the process of determining the optimal antenna matching value is directly performed without going through a specific cycle.
  • FIG. 3 is a flow chart of an antenna tuner transmitting cycle in the Band38 band according to an embodiment of the present invention, the specific steps are as follows:
  • Step 301 The transmitter starts to work in Band38;
  • Step 302 The power coupler detects the output power from time to time;
  • Step 303 Adjust impedance matching controllable by the antenna tuner
  • Step 304 The current detector records the current value obtained during the adjustment process
  • Step 305 Select impedance matching when the current value is minimum
  • Step 306 Lock logic control parameters of the antenna tuner at this time
  • Step 307 Send a control signal to lock the impedance matching value of the antenna tuner.
  • the embodiments of the present invention have the following beneficial effects: First, the operating current value and the output power value of the power amplifier are obtained; and then the logic control parameters of the control antenna tuner are obtained according to the working current value and the output power value. Use logic control parameters to adjust the impedance matching of the antenna. It can improve the performance of existing antennas when working at different frequencies, thus achieving the effect of saving power and ensuring communication quality.
  • the terminal device includes:
  • a transceiver 41 configured to receive and transmit signals
  • a power amplifier 42 is coupled to the transceiver 41 for amplifying the power of the transmitted signal; a current detector 43 is coupled to the power amplifier 42 for acquiring the power amplifier
  • a power coupler 44 coupled to the power amplifier 42 for obtaining an output power value of the output of the power amplifier
  • a digital baseband processor 45 coupled to the current detector 43 for obtaining a logic control parameter for controlling the antenna tuner according to the operating current value and the output power value
  • An antenna tuner 46 is coupled to the digital baseband processor 45 for utilizing the logic control parameters to adjust impedance matching of the antenna.
  • the digital baseband processor 45 is further configured to control the antenna tuner to switch within an adjustable range, and record the received power value of the received signal during the adjustment process; and select the maximum received power.
  • the logic control parameters of the time control the antenna tuner to change the internal series-parallel capacitance to adjust the impedance matching of the antenna.
  • the terminal device further includes:
  • An analog baseband processor 47 is coupled to the digital baseband processor 45 and the transceiver 41, respectively, for processing analog signals.
  • the terminal device further includes:
  • An antenna switch module 48 is coupled to the power coupler 44 and the antenna tuner 46 for switching signals of different paths to the antenna.
  • the terminal device further includes:
  • a low noise amplifier 49 is coupled to the transceiver 41 and the antenna switch module 48, respectively, for reducing noise interference in the received signal.
  • the antenna tuner refers to the purpose of outputting a logic control voltage through the DBB to perform logic switching of the internal logic of the device to change the value of the series-parallel capacitance in the circuit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Transceivers (AREA)

Description

多频段天线自动调谐阻抗匹配的方法及终端设备 技术领域
本发明涉及通信技术领域, 尤其涉及一种多频段天线自动调谐阻抗匹配 的方法及终端设备。 背景技术
目前终端设备上应用了越来越多的频段, 而终端设备的空间有限, 不得 已将多个频段集中应用于一个主天线上,使得该主天线不得不牺牲一些性能, 以覆盖较宽的带宽和多个频带。
由于终端设备只使用同一个天线, 要覆盖多个频段而只使用同一套匹配 器件, 势必要造成天线在某些频段产生失配, 同时周边环境的变化也很容易 引起天线的失配。 这些方面的失配会造成功耗过大, 以及天线灵敏度降低等 一系列问题, 对终端设备的待机时间和连续通话的信号质量会造成影响。
因此, 需要一种可以根据工作环境变化来调整天线阻抗匹配的调谐器架 构。 这样就可以最大限度的提高现有天线在不同频率工作时的性能, 从而达 到省电和保证通信质量的效果。
然而, 目前的天线阻抗匹配的调谐器架构并不能满足上述需求。 发明内容
为了解决上述问题, 本发明的目的是提供一种多频段天线自动调谐阻抗 匹配的方法及终端设备, 可提高天线在多频段工作时的阻抗匹配效率, 使得 在保证天线性能的前提下更加省电。
为了达到上述目的, 本发明提供一种多频段天线自动调谐阻抗匹配的方 法, 所述方法包括:
获取发射信号时功率放大器的工作电流值和输出功率值;
根据所述工作电流值和输出功率值, 得到控制天线调谐器的逻辑控制参 数, 利用逻辑控制参数来调节天线的阻抗匹配。
优选的, 所述得到控制天线调谐器的控制信号, 利用逻辑控制参数来调 节天线的阻抗匹配的歩骤具体包括:
在保证当前所要的所述功率放大器的输出功率的前提下, 更改所述天线 调谐器的逻辑控制参数, 记录调整过程中所述功率放大器的工作电流值; 选取工作电流值最小时所, 对应的所述天线调谐器的逻辑控制参数; 根据选取的逻辑控制参数控制天线调谐器更改内部的串并联电容, 以调 节天线的阻抗匹配。
优选的, 所述方法还包括:
检测所述功率放大器的工作电流值和输出功率值。
优选的, 所述方法还包括:
预先设定循环检测所述工作电流值和输出功率值的周期。
优选的, 在信号接收时, 所述方法还包括:
检测接收信号的接收功率值;
控制天线调谐器在可调范围内切换, 记录调整过程中接收信号的接收功 率值;
选择接收功率最大时对应的所述天线调谐器的逻辑控制参数;
根据选取的逻辑控制参数控制天线调谐器更改内部的串并联电容, 以调 节天线的阻抗匹配。
同样, 为了达到上述目的, 本发明提供一种终端设备, 包括:
收发信机, 用于接收和发射信号;
功率放大器, 与所述收发信机连接, 用于放大发射信号的功率; 电流检测器, 与所述功率放大器连接, 用于获取所述功率放大器工作时 所消耗电流的工作电流值;
功率耦合器, 与所述功率放大器连接, 用于获取所述功率放大器输出端 的输出功率值;
数字基带处理器, 与所述电流检测器连接, 用于根据所述工作电流值和 输出功率值, 得到控制天线调谐器的逻辑控制参数;
天线调谐器, 与所述数字基带处理器连接, 用于利用所述逻辑控制参数 来调节天线的阻抗匹配。
优选的, 所述数字基带处理器, 还用于控制所述天线调谐器在可调范围 内切换, 记录调整过程中接收信号的接收功率值; 并选择接收功率最大时的 逻辑控制参数去控制所述天线调谐器更改内部的串并联电容, 以调节天线的 阻抗匹配。
优选的, 所述终端设备还包括:
模拟基带处理器, 分别与所述数字基带处理器和所述收发信机连接, 用 于对模拟信号进行处理。
优选的, 所述终端设备还包括:
天线开关模组, 分别与所述功率耦合器和所述天线调谐器连接, 用于将 不同路径的信号切换到天线上。
优选的, 所述终端设备还包括:
低噪声放大器, 分别与所述收发信机和所述天线开关模组连接, 用于降 低接收信号中的噪声干扰。
由上述技术方案可知, 本发明的实施例具有如下有益效果: 首先获取发 射信号时功率放大器的工作电流值和输出功率值; 然后根据所述工作电流值 和输出功率值, 得到控制天线调谐器的逻辑控制参数, 利用逻辑控制参数来 调节天线的阻抗匹配。 从而可提高现有天线在不同频率工作时的性能, 达到 省电和保证通信质量的效果。 附图说明
图 1为本发明的实施例中多频段天线自动调谐阻抗匹配的方法流程图; 图 2为本发明的实施例中天线调谐器在 Band38频段接收循环的流程图; 图 3为本发明的实施例中天线调谐器在 Band38频段发射循环的流程图; 图 4为本发明的实施例中终端设备的结构框图;
图 5为本发明的实施例图 4中天线调谐器的原理图。 具体实施方式
在本实施例中, 根据功率放大器在发射信号时的工作电流值和输出功率 值, 得到控制天线调谐器的逻辑控制参数, 利用该逻辑控制参数来调节天线 的阻抗匹配, 使得天线调谐器在可工作的范围内最大程度的提高天线性能, 从而优化整个终端设备的性能和功耗。
为了使本发明实施例的目的、 技术方案和优点更加清楚明白, 下面结合 实施例和附图, 对本发明实施例做进一歩详细地说明。 在此, 本发明的示意 性实施例及说明用于解释本发明, 但并不作为对本发明的限定。
参见图 1, 为本发明的实施例中多频段天线自动调谐阻抗匹配的方法流 程图, 具体歩骤如下:
歩骤 101、 获取功率放大器在发射信号时的工作电流值, 并将工作电流 值发送给数字基带处理器;
也就是, 在功率放大器的电源端设置一电流检测器, 电流检测器可采用 时时检测的方式, 检测功率放大器在发射信号时所消耗电流的工作电流值, 并将该工作电流值发送给数字基带处理器(DBB ) , 以记录不同状态下所消耗 电流的工作电流值。
歩骤 102、 获取功率放大器输出端的输出功率值, 并将输出功率值发送 给 DBB;
也就是, 在功率放大器的输出端设置一功率耦合器, 功率耦合器可采用 时时检测的方式, 检测功率放大器输出端的输出功率值, 并将该输出功率值 发送给 DBB , 以记录在不同状态下的输出功率值。
歩骤 103、 根据工作电流值和输出功率值, 得到控制天线调谐器的逻辑 控制参数, 利用逻辑控制参数来调节天线的阻抗匹配。
上述阻抗匹配是指信号传输过程中, 负载阻抗和信源内阻抗之间的特定 配合关系。 一件器材的输出阻抗和所连接的负载阻抗之间所应满足的某种关 系, 以免接上负载后对器材本身的工作状态产生明显的影响。
在上述歩骤中, 在保证当前所要的功率放大器的输出功率的前提下, 可 更改天线调谐器的逻辑控制参数, 记录功率放大器在调整过程中的工作电流 值; 然后选取工作电流值最小时对应的天线调谐器的逻辑控制参数; 最后根 据选取的逻辑控制参数控制天线调谐器更改内部的串并联电容, 以达到调节 天线的阻抗匹配的目的。
也就是, 当功率放大器以某功率输出时, 保持输出功率不变, 由 DBB控 制天线调谐器在可调范围内切换一遍, 此时记录功率放大器在调整过程中的 工作电流值, 选择工作电流最小时对应的天线调谐器的逻辑控制参数, 根据 选取的逻辑控制参数去控制天线调谐器的串并联电容值。
优选实施方式如下: 硬件上在功率放大器 (PA) 输入电源上设置一电流 检测器, 时时监控功率放大器在工作时所消耗电流的大小(工作电流值), 并 将所得结果输出给 DBB; 硬件上在功率放大器的功率输出端设置一功率耦合 器, 时时监控功率放大器发射出信号的功率大小 (输出功率值), 并将所得结 果输出给 DBB, DBB根据电流值和输出功率值,在保证当前所要的输出功率 的前提下, 更改天线调谐器的逻辑控制参数(逻辑控制电压), 记录功率放大 器在调整过程中的工作电流值, 选取工作电流值最小时对应的天线调谐器的 逻辑控制参数; 根据选取的逻辑控制参数控制天线调谐器更改内部的串并联 电容, 以调节天线的阻抗匹配。 从而达到保证当前所要输出功率的前提下, 消耗最小电流的目的。
当收发信机工作时,时时检测接收信号的功率值,保持连通状态,由 DBB 控制天线调谐器在可调范围内切换一遍,记录调整过程中接收信号的功率值, 选择接收功率最大时的逻辑控制参数, 根据选取的逻辑控制参数控制天线调 谐器更改内部的串并联电容, 以调节天线的阻抗匹配。
天线调谐器的逻辑控制参数只能在一定范围内改变串并联电容的值, 例 如串联的电容变化可以从 lpF到 10pF, 并联的电容变化可以从 lpF到 10pF。
在本实施例中,可根据平台工作时业务量的情况设定一个循环检测周期, 以便在天线周围环境改变的情况下, 可以最大限度的及时进行阻抗适配, 保 证数据业务的有效传输。
例如: 根据当前工作环境设置接收模式为编码方式 MCS16时, 其编码冗 余较多, 对网络环境要求较低, 自动循环检测周期为 Tl。 当平台工作在编码 方式为 MCS20时, 其编码冗余较少, 对网络环境要求较高, 自动循环检测周 期设置为 Τ2, Τ1 >Τ2ο
本发明的实施例可在发射和接收两个方面来分别调整天线调谐器的参数 来提高天线性能。
下面结合实例和附图, 以工作频点在 Band38和 Band40上的 TD-LTE终 端设备为例分别就发射接收两方面, 对本发明的实施例如何改善天线性能进 行介绍。
当终端设备工作的周边环境发生变化时,对天线接收性能的影响比较大, 因此有必要根据工作时数据量的情况设定合适的工作周期, 使得天线端的匹 配可以根据环境的变化适时进行调整。
例如, 当终端设备开机后工作在 Band38频段, 收发信机开始工作, 在工 作时隙, 接收天线端口接收的基站信号, 并检测其电平值报送给 DBB。 之后 在空闲时隙, 控制天线调谐器进行阻抗匹配变化, 下一工作时隙再次进行电 平检测, 如此循环, 将天线调谐器可控制的阻抗匹配全部测试一遍, 记录下 每次接收信号的功率值, 选择其中接收信号功率最大时的阻抗匹配, 将此时 天线调谐器的逻辑控制参数锁定, 以后该周期内每次在该频点接收时, 都采 用这种匹配数值, 直至下一周期开始, 重复上述匹配过程。 当终端设备工作 频点改变为 Band40时,不需经过特定周期循环,直接进行确定最佳天线阻抗 匹配值的过程。
参见图 2, 为本发明的实施例中天线调谐器在 Band38频段接收循环的流 程图, 具体歩骤如下:
歩骤 201、 接收机在 Band38频段开始工作;
歩骤 202、 调整天线调谐器可控制的阻抗匹配;
歩骤 203、 记录调整过程中得到的接收信号的功率值;
歩骤 204、 选择接收信号功率最大时的阻抗匹配;
歩骤 205、 锁定此时天线调谐器的逻辑控制参数;
歩骤 206、 发出控制信号, 锁定天线调谐器的阻抗匹配的值。
在执行完歩骤 206后, 在下一周期或频带切换后, 返回到歩骤 201。 同样, 当终端设备工作的周边环境发生变化时, 对天线发射性能的影响 比较大, 因此有必要根据工作时数据量的情况设定合适的工作周期, 使得天 线端的匹配可以根据环境的变化适时进行调整。
例如, 当终端设备开机后工作在 Band38 频段, 在工作时隙功率放大器 (PA) 开始工作, 功率耦合器时时检测功率放大器发出的功率, 进行闭环控 制, 使收发信机调整输出功率, 从而满足当前系统对输出功率的需求。 这时 记录工作状态下的电流值并报送给 DBB。 之后在空闲时隙控制天线调谐器进 行阻抗匹配变化, 下一工作时隙再次进行电流检测, 如此循环, 将天线调谐 器可控制的阻抗匹配全部测试一遍, 记录下每次发射电平的数值, 选择其中 电流值最小时的阻抗匹配, 将此时天线调谐器的逻辑控制电压锁定, 以后该 周期内每次在该频点发射时都采用该阻抗匹配的数值, 直至下一周期开始, 重复上述匹配过程。当终端工作频点更改为 Band40时,不需经过特定周期循 环, 直接进行确定最佳天线匹配值的过程。
参见图 3, 为本发明的实施例中天线调谐器在 Band38频段发射循环的流 程图, 具体歩骤如下:
歩骤 301、 发射机开始在 Band38工作;
歩骤 302、 功率耦合器时时检测输出功率;
歩骤 303、 调整天线调谐器可控制的阻抗匹配;
歩骤 304、 电流检测器记录调整过程中得到的电流值;
歩骤 305、 选择电流值最小时的阻抗匹配;
歩骤 306、 锁定此时天线调谐器的逻辑控制参数;
歩骤 307、 发出控制信号, 锁定天线调谐器的阻抗匹配的值。
在执行完歩骤 307后, 在下一周期或频带切换后, 返回到歩骤 301。 由上述技术方案可知, 本发明的实施例具有如下有益效果: 首先获取功 率放大器的工作电流值和输出功率值; 然后根据所述工作电流值和输出功率 值, 得到控制天线调谐器的逻辑控制参数, 利用逻辑控制参数来调节天线的 阻抗匹配。 可提高现有天线在不同频率工作时的性能, 从而达到省电和保证 通信质量的效果。
参见图 4, 为本发明的实施例中终端设备的结构框图, 由图中可知, 该 终端设备包括:
收发信机 41, 用于接收和发射信号;
功率放大器 42, 与所述收发信机 41连接, 用于放大发射信号的功率; 电流检测器 43, 与所述功率放大器 42连接, 用于获取所述功率放大器
42工作时所消耗电流的工作电流值;
功率耦合器 44, 与所述功率放大器 42连接, 用于获取所述功率放大器 输出端的输出功率值; 数字基带处理器 45, 与所述电流检测器 43连接, 用于根据所述工作电 流值和输出功率值, 得到控制天线调谐器的逻辑控制参数;
天线调谐器 46, 与所述数字基带处理器 45连接, 用于利用所述逻辑控 制参数来调节天线的阻抗匹配。
在本发明的另一实施例中, 所述数字基带处理器 45, 还用于控制所述天 线调谐器在可调范围内切换, 记录调整过程中接收信号的接收功率值; 并选 择接收功率最大时的逻辑控制参数去控制所述天线调谐器更改内部的串并联 电容, 以调节天线的阻抗匹配。
在本发明的另一实施例中, 所述终端设备还包括:
模拟基带处理器 47, 分别与所述数字基带处理器 45和所述收发信机 41 连接, 用于对模拟信号进行处理。
在本发明的另一实施例中, 所述终端设备还包括:
天线开关模组 48,分别与所述功率耦合器 44和所述天线调谐器 46连接, 用于将不同路径的信号切换到天线上。
在本发明的另一实施例中, 所述终端设备还包括:
低噪声放大器 49,分别与所述收发信机 41和所述天线开关模组 48连接, 用于降低接收信号中的噪声干扰。
参见图 5, 为本发明的实施例图 4中天线调谐器的原理图, 天线调谐器 指通过 DBB输出逻辑控制电压,进行器件内部的逻辑切换到更改电路中串并 联电容值的目的, 即可通过 DBB 的控制信号更改射频电路的阻抗匹配的器 件。
以上所述仅是本发明的优选实施方式, 应当指出, 对于本技术领域的普 通技术人员来说, 在不脱离本发明原理的前提下, 还可以作出若干改进和润 饰, 这些改进和润饰也应视为本发明的保护范围。

Claims

权利 要 求 书
1. 一种多频段天线自动调谐阻抗匹配的方法, 其特征在于, 所述方法包 括:
获取发射信号时功率放大器的工作电流值和输出功率值;
根据所述工作电流值和输出功率值, 得到控制天线调谐器的逻辑控制参 数, 利用逻辑控制参数来调节天线的阻抗匹配。
2. 根据权利要求 1所述的方法, 其特征在于, 所述得到控制天线调谐器 的控制信号, 利用逻辑控制参数来调节天线的阻抗匹配的歩骤具体包括: 在保证当前所要的所述功率放大器的输出功率的前提下, 更改所述天线 调谐器的逻辑控制参数, 记录调整过程中所述功率放大器的工作电流值; 选取工作电流值最小时所, 对应的所述天线调谐器的逻辑控制参数; 根据选取的逻辑控制参数控制天线调谐器更改内部的串并联电容, 以调 节天线的阻抗匹配。
3. 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括: 检测所述功率放大器的工作电流值和输出功率值。
4. 根据权利要求 3所述的方法, 其特征在于, 所述方法还包括: 预先设定循环检测所述工作电流值和输出功率值的周期。
5. 根据权利要求 1所述的方法, 其特征在于, 在信号接收时, 所述方法 还包括:
检测接收信号的接收功率值;
控制天线调谐器在可调范围内切换, 记录调整过程中接收信号的接收功 率值;
选择接收功率最大时对应的所述天线调谐器的逻辑控制参数;
根据选取的逻辑控制参数控制天线调谐器更改内部的串并联电容, 以调 节天线的阻抗匹配。
6. 一种终端设备, 其特征在于, 包括:
收发信机, 用于接收和发射信号;
功率放大器, 与所述收发信机连接, 用于放大发射信号的功率; 电流检测器, 与所述功率放大器连接, 用于获取所述功率放大器工作时 所消耗电流的工作电流值;
功率耦合器, 与所述功率放大器连接, 用于获取所述功率放大器输出端 的输出功率值;
数字基带处理器, 与所述电流检测器连接, 用于根据所述工作电流值和 输出功率值, 得到控制天线调谐器的逻辑控制参数;
天线调谐器, 与所述数字基带处理器连接, 用于利用所述逻辑控制参数 来调节天线的阻抗匹配。
7. 根据权利要求 6所述的终端设备,其特征在于,所述数字基带处理器, 还用于控制所述天线调谐器在可调范围内切换, 记录调整过程中接收信号的 接收功率值; 并选择接收功率最大时的逻辑控制参数去控制所述天线调谐器 更改内部的串并联电容, 以调节天线的阻抗匹配。
8. 根据权利要求 7所述的终端设备,其特征在于,所述终端设备还包括: 模拟基带处理器, 分别与所述数字基带处理器和所述收发信机连接, 用 于对模拟信号进行处理。
9. 根据权利要求 8所述的终端设备,其特征在于,所述终端设备还包括: 天线开关模组, 分别与所述功率耦合器和所述天线调谐器连接, 用于将 不同路径的信号切换到天线上。
10. 根据权利要求 9所述的终端设备, 其特征在于, 所述终端设备还包 括:
低噪声放大器, 分别与所述收发信机和所述天线开关模组连接, 用于降 低接收信号中的噪声干扰。
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CN102143100B (zh) 2014-01-15
US9160395B2 (en) 2015-10-13

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