WO2014000471A1 - 一种用于自动调节天线匹配的移动终端及其控制方法 - Google Patents

一种用于自动调节天线匹配的移动终端及其控制方法 Download PDF

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Publication number
WO2014000471A1
WO2014000471A1 PCT/CN2013/072792 CN2013072792W WO2014000471A1 WO 2014000471 A1 WO2014000471 A1 WO 2014000471A1 CN 2013072792 W CN2013072792 W CN 2013072792W WO 2014000471 A1 WO2014000471 A1 WO 2014000471A1
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Prior art keywords
antenna matching
module
baseband processing
antenna
mobile terminal
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PCT/CN2013/072792
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English (en)
French (fr)
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金鑫
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惠州Tcl移动通信有限公司
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Application filed by 惠州Tcl移动通信有限公司 filed Critical 惠州Tcl移动通信有限公司
Priority to US14/382,616 priority Critical patent/US20150024696A1/en
Priority to EP13809910.6A priority patent/EP2869472A4/en
Publication of WO2014000471A1 publication Critical patent/WO2014000471A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/38—Transceivers, 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
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/408—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency the transmitter oscillator frequency being identical to the receiver local oscillator frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; 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
    • H01Q1/243—Supports; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a mobile terminal for automatically adjusting antenna matching and a control method thereof.
  • RSSI Receiveived Signal Strength
  • Indication received signal strength indication
  • the link quality indicating the strength of the communication signal.
  • the RSSI is about 90dbm
  • the signal is good.
  • the RSSI value is less than 70dbm, there will be a phenomenon such as dropped calls, crosstalk, poor voice quality, and difficulty in networking during communication.
  • the size of the RSSI value is related to factors such as the wireless environment, signal strength, call frequency, and antenna matching.
  • the receiving impedance of the antenna is often matched to the optimal state by adjusting the matching impedance of the antenna matching circuit, thereby increasing the RSSI value.
  • the existing antenna matching circuit is a ⁇ -type matching circuit in which the capacitance and inductance values are fixed.
  • Chart matches the impedance map so that the final matching impedance falls on smith Near the center of the chart (the Smith chart), the closer to the center of the circle, the better the matching, the higher the efficiency of the antenna, and the higher the RSSI value, and vice versa.
  • the frequency bands that can be included in mobile phones are also gradually increasing. For example, there are often 5 or 6 frequency bands in smart phones.
  • the more frequency bands that are included the more base station signals can be selected, which not only expands the connection rate of the mobile phone, keeps the call constant, but also obtains good call quality and communication coverage.
  • the increase of the frequency band puts higher requirements on the design of the antenna, especially on the antenna matching.
  • only one frequency band corresponds to an optimal antenna matching circuit, and it is easier to match the appropriate impedance.
  • it is generally designed to find a balance point in five frequency bands to meet the matching requirements of all frequency bands.
  • the matching impedance obtained by this method is not highly compatible with each frequency band, and the receiving capability of the antenna cannot be flexibly adjusted according to the change of the frequency band, especially in a region where the mobile phone is concentrated, or the signal penetration in a relatively densely populated area.
  • the ability is not strong, the RSSI signal of the mobile phone is often reduced by the environment, resulting in a drop in call quality.
  • An object of the present invention is to provide a mobile terminal for automatically adjusting antenna matching and a control method thereof, so as to solve the problem that the antenna matching circuit of the prior art cannot arbitrarily adjust the antenna matching impedance when the call frequency band is changed, and meet the matching requirements of multiple frequency bands. The problem of poor call quality.
  • the present invention provides a mobile terminal for automatically adjusting antenna matching, which includes:
  • the baseband processing module is configured to monitor and determine the RSSI value, output the SPI control signal, and calculate the RSSI value according to the antenna matching impedance;
  • the SPI control interface is configured to transmit the SPI control signal sent by the baseband processing module to the antenna matching module in the RSSI adjustment mode;
  • the radio frequency transceiver module is configured to perform modulation and demodulation on the signal processed by the baseband processing module and the radio frequency front end module;
  • the RF front-end module is configured to filter and function the signal processed by the RF transceiver module and the antenna matching module;
  • An antenna matching module for adjusting a value of an antenna matching impedance
  • One end of the baseband processing module is connected to one end of the antenna matching module through the SPI control interface, and the other end of the baseband processing module is sequentially connected to the other end of the antenna matching module by the radio frequency transceiver module and the radio frequency front end module.
  • the antenna matching module is also connected to the antenna.
  • the present invention provides a control method for automatically adjusting antenna matching of a mobile terminal as described above, which includes:
  • the baseband processing module monitors the RSSI value in real time, and determines whether the RSSI value is less than the preset frequency band; if yes, the mobile terminal enters the RSSI adjustment mode and performs step C; otherwise, continues to monitor the RSSI value;
  • the baseband processing module transmits the SPI control signal to the antenna matching module through the SPI control interface, and the antenna matching module adjusts the value of the matching impedance of the antenna according to the SPI control signal; specifically:
  • the baseband processing module transmits the SPI control signal to the antenna matching module through the SPI control interface;
  • the SPI control signal adjusts the size of the variable capacitor and/or the variable inductor inside the antenna matching module
  • the antenna matching module generates a matching impedance through the adjusted variable capacitance and/or variable inductance.
  • the baseband processing module calculates the RSSI value according to the matching impedance of the antenna matching module and determines whether the adjusted RSSI value is smaller than the preset frequency band; if yes, step C is performed; otherwise, the adjustment ends and the RSSI adjustment mode is exited.
  • the present invention further provides another control method for automatically adjusting antenna matching of the mobile terminal, which includes:
  • the baseband processing module monitors the RSSI value in real time, and determines whether the RSSI value is less than the preset frequency band; if yes, the mobile terminal enters the RSSI adjustment mode and performs step C; otherwise, continues to monitor the RSSI value;
  • the baseband processing module transmits the SPI control signal to the antenna matching module through the SPI control interface, and the antenna matching module adjusts the value of the matching impedance of the antenna according to the SPI control signal;
  • the baseband processing module determines whether the adjusted RSSI value is less than the preset frequency band; if yes, step C is performed; otherwise, the adjustment ends, and the RSSI adjustment mode is exited.
  • the present invention provides a mobile terminal for automatically adjusting antenna matching and a control method thereof, and the baseband processing module monitors the value of the RSSI, and determines that it is smaller than the preset frequency band, and issues an SPI control signal through the SPI control interface.
  • the antenna matching module adjusts the values of the variable capacitance and the variable inductance inside the antenna matching module according to the received SPI control signal, thereby changing the value of the matching impedance of the antenna, resulting in an increase in the RSSI value. , get better communication signals, and ensure good call quality.
  • FIG. 1 is a schematic diagram of matching impedance of a smith chart in the prior art.
  • FIG. 2 is a structural block diagram of a mobile terminal for automatically adjusting antenna matching according to the present invention.
  • FIG. 3 is a schematic structural diagram of an embodiment of an antenna matching module of a mobile terminal according to the present invention.
  • FIG. 4 is a flow chart of a method for automatically adjusting a control method of antenna matching according to the present invention.
  • FIG. 5 is a schematic view showing the impedance of the flip phone when the cover is closed in the prior art.
  • FIG. 6 is a schematic view showing the impedance of the flip phone when the cover is opened in the prior art.
  • the present invention provides a mobile terminal for automatically adjusting antenna matching and a control method thereof.
  • the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
  • FIG. 2 is a structural block diagram of a mobile terminal for automatically adjusting antenna matching according to the present invention. As shown in FIG. 2, it includes a baseband processing module 100, an SPI control interface 200, a radio frequency transceiver module 300, a radio frequency front end module 400, an antenna matching module 500, and an antenna.
  • the baseband processing module 100 is configured to monitor, determine the value of the RSSI, output the SPI control signal, and calculate the value of the RSSI based on the antenna matching impedance.
  • Other functions of the baseband processing module 100, such as encoding/decoding of signals, are prior art and will not be described again in the present invention.
  • the SPI control interface 200 is configured to transmit the SPI control signal sent by the baseband processing module 100 to the antenna matching module 500 in the RSSI adjustment mode, and the RF transceiver module 300 is configured to perform modulation on the signals processed by the baseband processing module and the RF front-end module.
  • the RF front-end module 400 is configured to filter and power the signal processed by the RF transceiver module and the antenna matching module;
  • the antenna matching module 500 is configured to adjust the size of the variable capacitor and/or the variable inductor to change the antenna matching. The value of the impedance; the antenna is used to radiate and receive wireless signals.
  • the RF transceiver module 300 down-converts the signal transmitted by the baseband processing module 100 to reduce the signal frequency, and further up-converts the signal transmitted by the RF front-end module 400 to improve the signal frequency.
  • One end of the baseband processing module 100 is connected to one end of the antenna matching module 500 through the SPI control interface 200.
  • the other end of the baseband processing module 100 sequentially passes through the radio frequency transceiver module 300 and the radio frequency front end module 400.
  • the antenna matching module 500 is also connected to the antenna.
  • the components in the antenna matching module 500 are variable capacitors and/or variable inductors; the mobile terminal is a mobile phone, a tablet computer or a data card.
  • FIG. 3 is a schematic structural diagram of an embodiment of an antenna matching module of a mobile terminal according to the present invention. It includes a first capacitor C1, a second capacitor C2, and a first inductor L1. One end of the first capacitor C1 is connected to one end of the second capacitor C2 through the first inductor L1, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded.
  • the first capacitor C1 and the second capacitor C2 are variable capacitors, and the first inductor L1 is a variable inductor.
  • the first capacitor C1, the second capacitor C2 and the first inductor L1 constitute a ⁇ -type matching circuit.
  • all of the electronic components used may be variable capacitors, or all of them may be variable inductors, or two variable inductors may be combined with one variable capacitor, or two variable capacitors may be used.
  • a variable inductance combination It can be understood that the electronic components in the antenna matching module can be combined into other forms of the antenna matching circuit in addition to the form of the ⁇ -type matching circuit, which is not limited by the present invention.
  • control method provided by the present invention includes the following steps:
  • the baseband processing module monitors the value of the RSSI in real time, and determines whether the value of the RSSI is smaller than the preset frequency band; if yes, step S30 is performed; otherwise, the RSSI value is continuously monitored.
  • the preset frequency band is 70 dbm.
  • the value of RSSI is about 90dbm, indicating that the signal is good. If it is less than 70dbm, the call quality will be affected.
  • the value of the RSSI varies with factors such as the wireless environment, the location of the signal strength, the call frequency, and the antenna matching.
  • FIGS. 5 and 6, respectively it is a schematic diagram of the impedance of the prior art flip phone when the cover is closed and the cover is opened. The impedance of the flip phone when opening and closing is different, which results in different antenna matching, which affects the change of RSSI value.
  • the baseband processing module transmits the SPI control signal to the antenna matching module through the SPI control interface, and the antenna matching module adjusts the value of the antenna matching impedance according to the SPI control signal.
  • the control interface transmits serial data control commands according to its unique transmission protocol to realize data communication between the baseband processing module and the antenna matching module. That is, the SPI control signal is a digital signal, and a binary code such as 010111 can be used.
  • the SPI control signals sent each time are different, and the specific data is controlled by the baseband processing module.
  • the antenna matching module uses a matching circuit of a variable capacitance circuit and/or a variable inductance combination, and reference may be made to FIG. 3.
  • the size of the variable capacitor and/or the variable inductor is adjusted according to the binary code sent by the SPI control signal to derive a matching impedance.
  • the baseband processing module determines whether the adjusted RSSI value is less than a preset frequency band; if yes, step S40 is performed; otherwise, the adjustment ends, and the RSSI adjustment mode is exited.
  • the baseband processing module compares the calculated magnitude of a matched impedance with 50 ohms. The closer to 50 ohms, the higher the RSSI value and the lower the 50 ohm, the lower the RSSI value.
  • the baseband processing module sends the SPI control again. The signal adjusts the magnitude of the matching impedance.
  • the present invention monitors the RSSI value in real time through the baseband processing module.
  • the baseband processing module sends an SPI control signal to the antenna through the SPI control interface.
  • the matching module controls the size of the variable capacitance and/or the variable inductance in the antenna matching module to adjust the antenna matching impedance to improve the RSSI value, adapt to the new call frequency band, enhance the call signal, and ensure a good call environment.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transceivers (AREA)
  • Telephone Function (AREA)

Abstract

本发明公开了用于自动调节天线匹配的移动终端及其控制方法，所述移动终端及其控制方法通过判断RSSI数值是否小于预设数值，根据判断结果发送SPI控制信号由SPI控制接口传输至天线匹配模块，控制可变电容、可变电感大小从而调节天线匹配阻抗以提高RSSI数值。本发明移动终端及其控制方法通信信号好且通话质量高。

Description

一种用于自动调节天线匹配的移动终端及其控制方法 技术领域
本发明涉及通信技术领域，特别涉及一种用于自动调节天线匹配的移动终端及其控制方法。
 背景技术
目前，手机通信中常用RSSI（Received Signal Strength Indication，接收的信号强度指示）来判定链接质量，表示通信信号的强弱。一般设定RSSI在90dbm左右时表示信号良好，若RSSI的值小于70dbm，在通信时会出现掉线、串音、话音质量不好、难以联网等现象。RSSI值的大小与无线环境、信号强度、通话频率及天线匹配等因素有关。手机设计中常通过调节天线匹配电路的匹配阻抗将天线的接收能力匹配到最佳状态，进而提高RSSI的数值。现有的天线匹配电路是π型匹配电路，其中的电容、电感值固定。通过改变电容、电感接地或并联的情况，例如增加串联电感，如图1所示的现有技术中smith chart匹配阻抗示意图，使最终的匹配阻抗落在smith chart（史密斯圆图）的圆心附近，越接近圆心，说明匹配越好，天线的效率越高，从而RSSI值就越高，反之则反。
随着通信技术的发展，手机中可包含的频段也在逐渐增加，如智能手机中常有5、6个频段。包含的频段越多，可以选择的基站信号就越多，不仅可以扩大手机的接通率，保持通话不断，还能获得良好的通话质量和通信覆盖。但同时，频段的增加对天线的设计，尤其是对天线匹配提出了更高的要求。手机设计中仅一个频段时会对应一个最佳的天线匹配电路，比较容易匹配出合适的阻抗。但是对于手机中同时有5个频段时，一般设计成在5个频段中寻找一个平衡点来满足所有频段的匹配要求。这种方式得到的匹配阻抗与各个频段的适配度不高，天线的接收能力不能随频段的变化灵活地调节，特别是在手机比较集中的地区抢占频段，或房屋比较密集的地方信号穿透能力不强时，往往会使手机的RSSI信号受环境的影响而降低，从而导致通话质量下降。
因而现有技术还有待改进和提高。
 技术问题
本发明的目的在于提供一种用于自动调节天线匹配的移动终端及其控制方法，以解决通话频段改变时，现有技术的天线匹配电路不能任意调节天线匹配阻抗，满足多频段的匹配要求，通话质量不好的问题。
 技术解决方案
本发明提供一种用于自动调节天线匹配的移动终端，其包括：
基带处理模块，用于监控、判断RSSI数值，输出SPI控制信号，以及根据天线匹配阻抗计算RSSI的数值；
SPI控制接口，用于在RSSI调节模式下，将基带处理模块发出的SPI控制信号传输至天线匹配模块；
射频收发模块，用于对基带处理模块及射频前端模块处理后的信号进行调制解调；
射频前端模块，用于对射频收发模块及天线匹配模块处理后的信号进行滤波和功能放大；
天线匹配模块，用于调节天线匹配阻抗的数值；
天线，用于辐射和接收无线信号；
所述基带处理模块的一端通过所述SPI控制接口与所述天线匹配模块的一端连接，所述基带处理模块的另一端依次通过所述射频收发模块和射频前端模块与天线匹配模块的另一端连接，所述天线匹配模块还与天线连接。
本发明提供一种上述的移动终端自动调节天线匹配的控制方法，其包括：
A、开机时启动移动终端的RSSI监控模式；
B、基带处理模块实时监控RSSI的数值，并判断RSSI的数值是否小于预设频段；如果是，移动终端进入RSSI调节模式并执行步骤C；否则，继续监控RSSI的数值；
C、基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块，并由天线匹配模块根据所述SPI控制信号调节天线匹配阻抗的数值；具体包括：
基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块；
SPI控制信号调节天线匹配模块内部的可变电容和/或可变电感的大小；
天线匹配模块通过调节后的可变电容和/或可变电感的产生一匹配阻抗。
D、基带处理模块根据天线匹配模块的匹配阻抗的大小计算RSSI的数值并判断调节后的RSSI数值是否小于预设频段；如果是，则执行步骤C；否则，结束调节，退出RSSI调节模式。
本发明还的提供另一种上述的移动终端自动调节天线匹配的控制方法，其包括：
A、开机时启动移动终端的RSSI监控模式；
B、基带处理模块实时监控RSSI的数值，并判断RSSI的数值是否小于预设频段；如果是，移动终端进入RSSI调节模式并执行步骤C；否则，继续监控RSSI的数值；
C、基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块，并由天线匹配模块根据所述SPI控制信号调节天线匹配阻抗的数值；
D、基带处理模块判断调节后的RSSI数值是否小于预设频段；如果是，则执行步骤C；否则，结束调节，退出RSSI调节模式。
 有益效果
相较于现有技术，本发明提供的用于自动调节天线匹配的移动终端及其控制方法，由基带处理模块监控RSSI的数值，判断其小于预设频段时发出SPI控制信号，通过SPI控制接口传输至天线匹配模块，之后天线匹配模块根据接收到的SPI控制信号对天线匹配模块内部的可变电容和可变电感的值进行调控，进而改变了天线匹配阻抗的数值，导致RSSI的数值上升，获得较好的通信信号，保证了良好的通话质量。
 附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术中smith chart匹配阻抗示意图。
图2为本发明用于自动调节天线匹配的移动终端的结构框图。
图3为本发明移动终端的天线匹配模块实施例的结构示意图。
图4为本发明用于自动调节天线匹配的控制方法的方法流程图。
图5为现有技术中翻盖手机合上盖子时的阻抗示意图。
图6为现有技术中翻盖手机打开盖子时的阻抗示意图。
 本发明的最佳实施方式
本发明提供一种用于自动调节天线匹配的移动终端及其控制方法，为使本发明的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
请参阅图2，其为本发明用于自动调节天线匹配的移动终端的结构框图。如图2所示，其包括基带处理模块100、SPI控制接口200、射频收发模块300、射频前端模块400、天线匹配模块500和天线。
基带处理模块100用于监控、判断RSSI的数值，输出SPI控制信号，以及根据天线匹配阻抗计算RSSI的数值。基带处理模块100的其他功能，如对信号编/译码等是现有技术，在本发明中不再赘述。
SPI控制接口200用于在RSSI调节模式下，将基带处理模块100发出的SPI控制信号传输至天线匹配模块500；射频收发模块300用于对基带处理模块及射频前端模块处理后的信号进行调制解调；射频前端模块400用于对射频收发模块及天线匹配模块处理后的信号进行滤波和功率放大；天线匹配模块500用于调节可变电容和/或可变电感的大小，达到改变天线匹配阻抗的值；天线用于辐射和接收无线信号。
其中，射频收发模块300对基带处理模块100传输的信号进行下变频，降低信号频率，还对射频前端模块400传输的信号进行上变频，提高信号频率。
所述基带处理模块100的一端通过所述SPI控制接口200与所述天线匹配模块500的一端连接，所述基带处理模块100的另一端依次通过所述射频收发模块300和所述射频前端模块400与天线匹配模块500的另一端连接，所述天线匹配模块500还与天线连接。
其中，所述天线匹配模块500中的元件为可变电容和/或可变电感；所述移动终端为手机、平板电脑或数据卡。
请同时参阅图3，其为本发明移动终端的天线匹配模块实施例的结构示意图。其包括第一电容C1、第二电容C2和第一电感L1。所述第一电容C1的一端通过第一电感L1与第二电容C2的一端连接，第一电容C1的另一端，及第二电容C2的另一端均接地。其中，第一电容C1和第二电容C2是可变电容，第一电感L1是可变电感。
第一电容C1、第二电容C2和第一电感L1组成一种π型匹配电路。在这种π型匹配电路中，所采用的电子元件可以全部采用可变电容，或全部采用可变电感，或两个可变电感与一个可变电容组合，或者两个可变电容与一个可变电感组合。可以理解的是，天线匹配模块中的电子元件除了可以组合成π型匹配电路的形式，还可以组合成其他形式的天线匹配电路，本发明对此不作限定。
请参阅图4，本发明提供的控制方法包括以下步骤：
S10、开机时启动移动终端的RSSI监控模式。移动终端开机时会自动启动RSSI监控模式。
S20、基带处理模块实时监控RSSI的数值，并判断RSSI的数值是否小于预设频段；如果是，则执行步骤S30；否则，继续监控RSSI数值。
在本实施例中，预设频段为70dbm。一般规定RSSI的数值在90dbm左右表示信号良好，若小于70dbm则通话质量会受到影响。RSSI的数值会随着无线环境、所在地的信号强度、通话频率、天线匹配等因素的变化而变化。特别地，如图5、6所示，其分别为现有技术中翻盖手机合上盖子和打开盖子时的阻抗示意图。翻盖手机在开盖、合盖时的阻抗是不一样的，从而导致天线的匹配也不一样，进而影响了RSSI的数值变化。
S30、进入RSSI调节模式。
S40、基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块并由天线匹配模块根据所述SPI控制信号调节天线匹配阻抗的数值。
SPI（Serial Periphearl Interface，串行***接口）控制接口根据其特有的传输协议，传送串行数据控制命令，实现基带处理模块与天线匹配模块之间的数据通讯。即SPI控制信号为数字信号，可以采用二进制码，如010111。每次发送的SPI控制信号是不同的，具体数据由基带处理模块控制。
在本实施例中，天线匹配模块采用的是可变电容电路和/或可变电感组合的匹配电路，可参考图3。根据SPI控制信号发送的二进制码来调节可变电容和/或可变电感的大小，从而出得出一匹配阻抗。
S50、基带处理模块判断调节后的RSSI数值是否小于预设频段；如果是，则执行步骤S40；否则，结束调节，退出RSSI调节模式。
一般匹配阻抗为50欧姆时，天线的效率最优，通信信号最好。基带处理模块将计算出的一匹配阻抗的大小与50欧姆进行比较，越接近50欧姆，RSSI的数值越高，越偏离50欧姆，RSSI的数值就越低。
RSSI的数值在第一次调节后若能达到70dbm以上，则结束调节，退出RSSI调节模式，返回RSSI监控模式；若第一次调节后RSSI的数值仍小于70dbm，则基带处理模块再次发送SPI控制信号调节匹配阻抗的大小。
综上所述，本发明通过基带处理模块实时监测RSSI的数值，在通话频段改变或其他条件引起RSSI的数值下降小于预设频段时，基带处理模块发出SPI控制信号，经过SPI控制接口传输至天线匹配模块，控制天线匹配模块内的可变电容和/或可变电感的大小来调节天线匹配阻抗，以提高RSSI的数值，适应新的通话频段，增强通话信号，保证良好的通话环境。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。
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Claims (11)

  1. 一种用于自动调节天线匹配的移动终端，其特征在于，包括：
    基带处理模块，用于监控、判断RSSI数值，输出SPI控制信号，以及根据天线匹配阻抗计算RSSI的数值；
    SPI控制接口，用于在RSSI调节模式下，将基带处理模块发出的SPI控制信号传输至天线匹配模块；
    射频收发模块，用于对基带处理模块及射频前端模块处理后的信号进行调制解调；
    射频前端模块，用于对射频收发模块及天线匹配模块处理后的信号进行滤波和功能放大；
    天线匹配模块，用于调节天线匹配阻抗的数值；
    天线，用于辐射和接收无线信号；
    所述基带处理模块的一端通过所述SPI控制接口与所述天线匹配模块的一端连接，所述基带处理模块的另一端依次通过所述射频收发模块和射频前端模块与天线匹配模块的另一端连接，所述天线匹配模块还与天线连接。
  2. 根据权利要求1所述的移动终端，其特征在于，所述天线匹配模块中的元件为可变电容和/或可变电感。
  3. 根据权利要求1所述的移动终端，其特征在于，所述移动终端为手机、平板电脑或数据卡。
  4. 一种采用权利要求1所述的移动终端自动调节天线匹配的控制方法，其特征在于，包括：
    A、开机时启动移动终端的RSSI监控模式；
    B、基带处理模块实时监控RSSI的数值，并判断RSSI的数值是否小于预设频段；如果是，移动终端进入RSSI调节模式并执行步骤C；否则，继续监控RSSI的数值；
    C、基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块，并由天线匹配模块根据所述SPI控制信号调节天线匹配阻抗的数值；具体包括：
    基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块；
    SPI控制信号调节天线匹配模块内部的可变电容和/或可变电感的大小；
    天线匹配模块通过调节后的可变电容和/或可变电感的产生一匹配阻抗。
    D、基带处理模块根据天线匹配模块的匹配阻抗的大小计算RSSI的数值并判断调节后的RSSI数值是否小于预设频段；如果是，则执行步骤C；否则，结束调节，退出RSSI调节模式。
  5. 根据权利要求4所述的自动调节天线匹配的控制方法，其特征在于，所述SPI控制信号为数字信号。
  6. 根据权利要求4所述的自动调节天线匹配的控制方法，其特征在于，预设频段为70dbm。
  7. 一种采用权利要求1所述的移动终端自动调节天线匹配的控制方法，其特征在于，包括：
    A、开机时启动移动终端的RSSI监控模式；
    B、基带处理模块实时监控RSSI的数值，并判断RSSI的数值是否小于预设频段；如果是，移动终端进入RSSI调节模式并执行步骤C；否则，继续监控RSSI的数值；
    C、基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块，并由天线匹配模块根据所述SPI控制信号调节天线匹配阻抗的数值；
    D、基带处理模块判断调节后的RSSI数值是否小于预设频段；如果是，则执行步骤C；否则，结束调节，退出RSSI调节模式。
  8. 根据权利要求7所述的自动调节天线匹配的控制方法，其特征在于，所述步骤C具体包括：
    C1、基带处理模块通过SPI控制接口传输SPI控制信号至天线匹配模块；
    C2、SPI控制信号调节天线匹配模块内部的可变电容和/或可变电感的大小；
    C3、天线匹配模块通过调节后的可变电容和/或可变电感的产生一匹配阻抗。
  9. 根据权利要求7所述的自动调节天线匹配的控制方法，其特征在于，所述步骤D还包括：
    D1、基带处理模块根据天线匹配模块的匹配阻抗的大小计算RSSI的数值。
  10. 根据权利要求7所述的自动调节天线匹配的控制方法，其特征在于，所述SPI控制信号为数字信号。
  11. 根据权利要求7所述的自动调节天线匹配的控制方法，其特征在于，预设频段为70dbm。
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