WO2010045822A1 - 双模手机及其抑制移动通信全球系统/码分多址互扰的方法 - Google Patents

双模手机及其抑制移动通信全球系统/码分多址互扰的方法 Download PDF

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Publication number
WO2010045822A1
WO2010045822A1 PCT/CN2009/073401 CN2009073401W WO2010045822A1 WO 2010045822 A1 WO2010045822 A1 WO 2010045822A1 CN 2009073401 W CN2009073401 W CN 2009073401W WO 2010045822 A1 WO2010045822 A1 WO 2010045822A1
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Prior art keywords
gsm
cdma
dual
radio frequency
switch
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PCT/CN2009/073401
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English (en)
French (fr)
Inventor
秦宇
程守刚
Original Assignee
中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP09821543.7A priority Critical patent/EP2352356B1/en
Priority to US13/125,435 priority patent/US8340608B2/en
Priority to ES09821543.7T priority patent/ES2654535T3/es
Publication of WO2010045822A1 publication Critical patent/WO2010045822A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/0057—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
    • 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
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/71—Interference-related aspects the interference being narrowband interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70707—Efficiency-related aspects
    • H04B2201/7071—Efficiency-related aspects with dynamic control of receiver resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70707—Efficiency-related aspects
    • H04B2201/7071—Efficiency-related aspects with dynamic control of receiver resources
    • H04B2201/70711—Efficiency-related aspects with dynamic control of receiver resources with modular structure

Definitions

  • the present invention relates to the field of wireless communication mobile terminals, and in particular, to a GSM/CDMA dual-mode mobile phone and a ⁇ GC-internal system. method.
  • GSM Global System for Mobile Communication
  • CDMA Code Division Multiple Access
  • Standby mobile terminals, such communication terminals need to support two types of wireless modules to work simultaneously.
  • GC inter-communication that is, GSM/CDMA inter-connected.
  • the existing GC dual-mode mobile phone includes a CDMA radio frequency circuit, a CDMA antenna, a GSM radio frequency circuit, a GSM antenna, and a baseband circuit, and the baseband circuit is composed of a CDMA baseband chip and a GSM baseband chip, and the above CDMA baseband chip and CDMA radio frequency.
  • the circuit and the CDMA antenna are sequentially connected; the GSM baseband chip, the GSM radio frequency circuit, and the GSM antenna are also connected in sequence.
  • the existing GC dual-mode mobile phone is implemented by separating the GSM antenna from the CDMA antenna, that is, using two antennas placed on the upper and lower ends of the mobile phone. In this way, interference suppression measures can be taken on the circuit, and the call performance can be basically guaranteed in practical applications, but the following problems exist:
  • the present invention has been made in view of the problem of suppressing GC mutual interference caused by the method of separating a GSM antenna and a CDMA antenna in the prior art, which causes a limitation on the size of the mobile phone and a small room for improvement in isolation.
  • the purpose is to provide a GSM/CDMA dual-mode mobile phone and its suppression The method of GC mutual ⁇ .
  • a GSM/CDMA dual mode mobile phone is provided.
  • the GSM/CDMA dual-mode mobile phone includes: a CDMA radio frequency circuit, a GSM radio frequency circuit, a baseband circuit including a CDMA baseband chip and a GSM baseband chip, the CDMA radio frequency circuit including a CDMA radio frequency receiving circuit, a CDMA radio frequency transmitting circuit, and The duplexer, the CDMA radio frequency transmitting circuit is respectively connected to the CDMA baseband chip and the duplexer, and the CDMA radio frequency receiving circuit comprises a CDMA receiver, a receiving filter and an LNA (ie, a Low Noise Amplifier), which are sequentially connected,
  • the CDMA receiver is connected to the CDMA baseband chip, and the LNA is connected to the duplexer;
  • the GSM radio frequency circuit is connected with the GSM baseband chip;
  • the GSM/CDMA dual mode mobile phone further includes: a dual port antenna, respectively, and a duplexer, a GSM radio frequency circuit a signal for accessing GSM and CDMA; a radio frequency switch disposed in the CD
  • the dual port antenna is an antenna body having two ports shared by GSM and CDMA antennas for accessing signals of GSM and CDMA, respectively.
  • the radio frequency switch is located between the LNA and the duplexer for suppressing the GSM signal strength entering the LNA.
  • the radio frequency switch is located between the receiving filter and the LNA for suppressing nonlinear products generated by the LNA.
  • the radio frequency switch is located between the LNA and the duplexer and between the receiving filter and the LNA (ie, there are two radio switches, which are located before and after the LNA), and is used for suppressing the GSM signal strength and the LNA entering the LNA. The resulting nonlinear product.
  • the radio frequency switch is a one-stage or multi-stage switch.
  • a GSM/CDMA dual mode handset suppression is also provided.
  • the method of suppressing the GC mutual 4 is as follows:
  • the GSM baseband chip initiates a physical channel switching in a dual-call state or a dual-talk state
  • the GSM baseband chip and the CDMA baseband chip respectively read the GSM working frequency and the CDMA operating frequency to be used, and the GSM/CDMA dual-mode mobile phone determines whether it belongs to the adjacent frequency band. If so, the GSM baseband chip starts the switching function of the RF switch, and enters the double In the call state or double talk state, the channel is switched to step C; otherwise, it is judged whether the switching function of the radio frequency switch is activated, and if so, the GSM baseband chip sets the radio frequency switch to be always on ⁇ ! Dog state, enter double call ⁇ ! Dog or double call ⁇ ! Channel switching in the dog state, end double call ⁇ !
  • the invention suppresses the interference of the GSM transmission to the CDMA receiving from the circuit, and the isolation is high, and the antenna design is compressed at the same time, which reduces the requirement of the shape and volume of the whole antenna by the dual antenna. Increased flexibility in dual-mode phone design.
  • FIG. 1 is a schematic diagram of an overall layout of a conventional GSM/CDMA dual-mode mobile phone
  • FIG. 2 is a schematic diagram of an overall layout of a GSM/CDMA dual-mode mobile phone according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of another circuit of a GSM/CDMA dual-mode mobile phone according to an embodiment of the present invention
  • FIG. 5 is a GSM/CDMA dual according to an embodiment of the present invention.
  • Another circuit schematic of the die phone; 6 is a flow chart showing the suppression of GC mutual interference by a GSM/CDMA dual mode mobile phone according to an embodiment of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • Apparatus Embodiment is a schematic diagram showing the overall layout of a GSM/CDMA dual-mode mobile phone according to an embodiment of the present invention. As shown in FIG.
  • a GSM/CDMA dual-mode mobile phone includes a CDMA radio frequency circuit 1, GSM.
  • the RF circuit 2 includes a baseband circuit 3 and a dual port antenna 4 including a CDMA baseband chip 31 and a GSM baseband chip 32.
  • the CDMA radio frequency circuit 1 includes a CDMA radio frequency receiving circuit 11, a CDMA radio frequency transmitting circuit 12, and a duplexer 13, a CDMA radio frequency.
  • the transmitting circuit 12 is respectively connected to the CDMA baseband chip 31 and the duplexer 13.
  • the CDMA radio receiving circuit 11 includes a CDMA receiver 111, a receiving filter 112 and an LNA 113 connected in series, and the CDMA receiver 111 is connected to the CDMA baseband chip 31.
  • the LNA 113 is connected to the duplexer 13; the GSM radio frequency circuit 2 is connected to the GSM baseband chip 32; the dual port antenna 4 is connected to the duplexer 13, the GSM radio frequency circuit 2, which is an antenna body having The two ports are shared by the GSM and CDMA antennas for accessing the signals of GSM and CDMA respectively.
  • the embodiment of the present invention can select an RF switch with appropriate isolation and is inserted in the CDMA RF receiving circuit 11, as shown in FIG.
  • the RF switch 114 can be placed between the LNA 113 and the duplexer 13, controlled by the GSM baseband chip 32, and can cut off the dual port antenna 4 when the GSM transmit time slot and the GSM operating frequency and the CDMA operating frequency belong to adjacent frequency bands.
  • the incoming CDMA signal (i.e., the CDMA receive path is cut) is used to suppress the GSM signal strength entering the LNA 113 to enhance isolation between the GSM signal and the CDMA signal.
  • 4 is another circuit schematic diagram of a GSM/CDMA dual-mode mobile phone according to an embodiment of the present invention. As shown in FIG. 4, an RF switch can also be placed between the receive filter 112 and the LNA 113 for use in the ⁇ LNA. 113 produces a nonlinear product. The above two methods are equivalent in effect, and one of them can be used as needed, or all of them are used as shown in FIG. 5, that is, the RF switches 114 114 are respectively located before and after the LNA 113 of the CDMA radio frequency receiving circuit 11.
  • the radio frequency switch in the embodiment of the invention is composed of GSM baseband chip control, in the GSM transmission time slot, switching the RF switch to disconnect the CDMA receiving path; in other time slots of GSM, switching the RF switch to maintain the smoothness of the CDMA receiving circuit, the two can maintain strict synchronization.
  • the GSM/CDMA dual-mode mobile phone provided by the embodiment of the present invention ensures the isolation between the GCs, so the isolation between the antennas can be neglected, and the layout of the two antennas on the upper and lower ends of the mobile phone can be changed. At the same end of the phone.
  • the two antennas can be equivalent to one broadband-covered antenna at the same end, and the antenna needs to have two ports in order to achieve the dual-network standby requirement.
  • FIG. 6 is a schematic flow chart of suppressing GC mutual interference according to the GSM/CDMA dual-mode mobile phone according to an embodiment of the present invention, as shown in FIG. 6.
  • the GSM baseband chip is ready to start a dual-talk dog state or a dual-talk dog state physical channel. Switching; the RF switch is in a normally-on state before starting, and the RF switch starts to switch after starting, so that the CDMA receiving path is switched between two states of "on” and “off” to ensure the transmission time slot in GSM.
  • the CDMA receiving path is disconnected, and the CDMA receiving path is turned on in the non-GSM transmitting time slot.
  • the GSM baseband chip and the CDMA baseband chip respectively read the GSM working frequency and the CDMA operating frequency to be used, and the mobile phone determines whether it belongs to the adjacent frequency band. If yes, the GSM baseband chip starts the switching function of the radio frequency switch, enters the double-talk state or the channel switching in the double-talk state, and then ends the double-talk state, and sets the radio frequency switch to the normally-on state; otherwise, determines whether the switching function of the radio frequency switch is activated, If so, then the GSM baseband chip sets the RF switch to be always on!
  • the above dual-call state means that the mobile phone simultaneously talks in the GSM and CDMA modes; In the voice state, the channel switching refers to the original double-talk state, and because the working frequency interval between the GSM and the CDMA is determined to be far from the radio switch, the current channel (for example, the mobile phone moves into another cell) needs to be a channel.
  • GSM or CDMA When GSM or CDMA is in a call state (called a single call state), another phone (CDMA or GSM) is incoming, and the mobile phone needs to determine whether the channels of the two calls belong to the adjacent channel. If so, the RF switch needs to be activated. Switch functions and put your phone into a dual-call state. If the mobile phone user needs to hang up the previous one-way call, answer the incoming call, or keep the previous call, after receiving the call, continue to answer the previous call, which is the end of the dual call state.
  • the switch is then placed in a normally-on state.
  • the GC interference mainly manifests as the interference of the transmit power of the GSM900M band to the received signal of the CDMA800M band.
  • the GSM baseband chip initiates a physical channel switching in a dual-call state or a dual-talk state
  • the GSM baseband chip and the CDMA baseband chip respectively read the GSM working frequency and the CDMA operating frequency to be used, and the GSM/CDMA dual-mode mobile phone determines whether it belongs to the adjacent frequency band. If so, the GSM baseband chip starts the switching function of the RF switch, and enters the double In the call state or double talk state, the channel is switched to step C; otherwise, it is judged whether the switching function of the radio frequency switch is activated, and if so, the GSM baseband chip sets the radio frequency switch to be always on ⁇ ! Dog state, enter double call ⁇ ! Dog or double call ⁇ ! Channel switching in the dog state, end double call ⁇ !

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

双模手机及其抑制移动通信全球系统 /码分多址互扰的方法 技术领域 本发明涉及无线通信移动终端领域，具体涉及一种 GSM/CDMA双模手 机及其 Φ ^制 GC互 4尤的方法。 背景技术 移动通信全球系统 ( Global System for Mobile Communication, 筒称为 GSM ) /码分多址 （ Code Distribute Multiple Access, 筒称为 CDMA ) 双模手 机是一种支持 GSM、 CDMA两种制式同时在网待机的移动终端， 这类通讯 终端需要支持两种制式的无线模块同时工作。 但是当两种无线模块的工作频 率邻近时会存在相互干扰， 该干扰对其各自的无线性能会产生一定的影响， 该现象筒称 GC互 4尤 , 即 , GSM/CDMA互 4尤。 现有技术对于 GC互扰的抑制办法， 主要是通过增加 GSM和 CDMA 天线的隔离度来实现。如图 1所示，现有 GC双模手机包括 CDMA射频电路、 CDMA天线、 GSM射频电路、 GSM天线以及基带电路 ,其基带电路由 CDMA 基带芯片和 GSM基带芯片组成， 上述 CDMA基带芯片、 CDMA射频电路、 CDMA天线依次连接； 上述 GSM基带芯片、 GSM射频电路、 GSM天线也 依次连接。 现有 GC双模手机其天线的实现方式是将 GSM天线和 CDMA天 线分开， 即， 使用两支天线， 分别放置在手机的上下两端。 采用这种方式可 以不考虑在电路上采取干扰抑制措施，在实际应用中基本可以保证通话性能 , 但是存在以下的问题：
1. 两支天线对空间的要求限制了手机的造型向小和薄的方向发展；
2. 天线设计过程中， 隔离度主要由两支天线间的空间距离确定， 其它 因素的作用不明显， 因此在天线调试过程中， 隔离度提升的余地不大。 发明内容 针对现有技术中存在的采用将 GSM天线和 CDMA天线分开的方法抑 制 GC互扰造成对手机尺寸的限制及隔离度提升余地不大的问题而提出本发 明， 为此， 本发明的主要目的在于提供一种 GSM/CDMA双模手机及其抑制 GC互 ·ί尤的方法。 为了实现上述目的， 根据本发明的一个方面， 提供了一种 GSM/CDMA 双模手机。 才艮据本发明的 GSM/CDMA双模手机包括： CDMA射频电路、 GSM射 频电路、 包含 CDMA基带芯片和 GSM基带芯片的基带电路， 所述 CDMA 射频电路包括 CDMA射频接收电路、 CDMA射频发射电路和双工器， CDMA 射频发射电路与 CDMA基带芯片、 双工器分别连接， 所述 CDMA射频接收 电路包括依次连接的 CDMA接收机、 接收滤波器和 LNA (即 Low Noise Amplifier,氐噪声放大器）， 该 CDMA接收机与 CDMA基带芯片连接， LNA 与双工器连接； 所述 GSM射频电路与 GSM基带芯片连接； 该 GSM/CDMA 双模手机还包括： 双端口天线， 分别与双工器、 GSM射频电路连接， 用于接入 GSM和 CDMA的信号； 射频开关， 设置在所述 CDMA射频接收电路中， 所述射频开关由 GSM 基带芯片控制 , 用于在 GSM的发射时隙且 GSM工作频率和 CDMA工作频 率属于临近频段时切断双端口天线接入的 CDMA信号 （即切断 CDMA的接 收通路 ), 以增强 GSM信号与 CDMA信号之间的隔离。 优选地， 所述双端口天线是一个天线主体， 具有两个端口， 由 GSM和 CDMA天线共用， 分别用于接入 GSM和 CDMA的信号。 优选地， 所述射频开关位于 LNA 与双工器之间， 用于抑制进入 LNA 的 GSM信号强度。 优选地， 所述射频开关位于接收滤波器与 LNA之间， 用于抑制 LNA 产生的非线性产物。 优选地， 所述射频开关位于所述 LNA与双工器之间以及接收滤波器与 LNA之间 （即有两个射频开关， 分别位于 LNA前后）， 用于抑制进入 LNA 的 GSM信号强度及 LNA产生的非线性产物。 优选地， 所述射频开关是一级或多级开关。 根据本发明的另一个方面， 还提供了一种 GSM/CDMA 双模手机抑制 GC互 ·ί尤的方法。 才艮据 GSM/CDMA双模手机抑制 GC互 4尤的方法包括步骤如下：
A、 GSM基带芯片启动双通话状态或双通话状态下物理信道切换；
B、 GSM基带芯片和 CDMA基带芯片分别读取要使用的 GSM工作频 率和 CDMA工作频率， GSM/CDMA双模手机判断是否属于临近频段，若是， 则 GSM基带芯片启动射频开关的切换功能， 进入双通话状态或双通话状态 下信道切换， 至步骤 C; 否则， 判断射频开关的切换功能是否启动， 若是， 则 GSM基带芯片置射频开 关为常通 ^！犬态，进入双通话 ^！犬态或双通话 ^！犬态下信道切换 , 结束双通话 ^！犬态； 否则，保持射频开关为常通状态，进入双通话状态或双通话状态下信道切换， 结束双通话犬态； c、 结束双通话状态， 置射频开关为常通状态。 本发明通过在 CDMA射频接收电路中设置射频开关， 从电路上抑制了 GSM发射对 CDMA接收的干扰， 隔离度高， 同时筒化了天线设计， 降低了 双天线对整机外形和体积的要求 , 增加了双模手机设计的灵活性。 附图说明 此处所说明的附图用来提供对本发明的进一步理解 ,构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1是现有 GSM/CDMA双模手机的整体布局示意图； 图 2是根据本发明实施例的 GSM/CDMA双模手机的整体布局示意图； 图 3是才艮据本发明实施例的 GSM/CDMA双模手机的电路原理图； 图 4是根据本发明实施例的 GSM/CDMA双模手机的另一电路原理图； 图 5是才艮据本发明实施例的 GSM/CDMA双模手机的再一个电路原理 图； 图 6是才艮据本发明实施例的 GSM/CDMA双模手机抑制 GC互扰的流程 示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在 不冲突的情况下， 本申请中的实施例及实施例中的特征可以相互组合。 装置实施例 图 2是根据本发明实施例的 GSM/CDMA双模手机的整体布局示意图， 如图 2所示，才艮据本发明实施例的 GSM/CDMA双模手机包括 CDMA射频电 路 1、 GSM射频电路 2、 包含 CDMA基带芯片 31和 GSM基带芯片 32的基 带电路 3及双端口天线 4, 所述 CDMA射频电路 1包括 CDMA射频接收电 路 11、 CDMA射频发射电路 12和双工器 13 , CDMA射频发射电路 12与 CDMA基带芯片 31、 双工器 13分别连接， CDMA射频接收电路 11包括依 次连接的 CDMA接收机 111、 接收滤波器 112和 LNA 113 , 该 CDMA接收 机 111与 CDMA基带芯片 31连接， LNA 113与双工器 13连接； 所述 GSM 射频电路 2与 GSM基带芯片 32连接； 该双端口天线 4与双工器 13、 GSM 射频电路 2分另' J连接，其是一个天线主体，具有两个端口， 由 GSM和 CDMA 天线共用 , 分别用于接入 GSM和 CDMA的信号； 本发明实施例可选择隔离 度合适的射频开关， 插在 CDMA射频接收电路 11中， 如图 3所示， 射频开 关 114可以放在 LNA 113与双工器 13之间， 由 GSM基带芯片 32控制， 可 在 GSM的发射时隙且 GSM工作频率和 CDMA工作频率属于临近频段的情 况下切断双端口天线 4接入的 CDMA信号 （即， 切断 CDMA的接收通路 ), 用于抑制进入 LNA 113的 GSM信号强度， 以增强 GSM信号与 CDMA信号 之间的隔离。 图 4是根据本发明实施例的 GSM/CDMA双模手机的另一电路原理图， 如图 4所示， 射频开关 也可放在接收滤波器 112与 LNA 113之间 , 用于 Φ ^制 LNA 113产生的非线性产物。 上述两种方式效果相当， 可以才艮据需要使用其中一种方式， 或者如图 5 所示全都使用， 即， 射频开关 114 114分别位于 CDMA射频接收电路 11 的 LNA 113之前和之后。 如果对隔离度有更高的要求可以通过更换高隔离度 的射频开关或者使用多级的射频开关来实现。 本发明实施例中的射频开关由 GSM基带芯片控制， 在 GSM的发射时隙， 切换该射频开关断开 CDMA接 收通路； 在 GSM的其它时隙 , 切换射频开关维持 CDMA接收电路的畅通， 两者可保持严格的同步。 本发明实施例提供的 GSM/CDMA双模手机保证了 GC之间的隔离度， 因此可以忽略对天线之间隔离度的要求 , 可以改变两支天线分别放在手机上 下两端的布局方式， 天线放在手机同一端。 更进一步， 因为可以不考虑天 线之间的隔离度， 两支天线放在同一端可等价为一支覆盖宽频带的天线， 同 时为了实现双网待机的要求， 该天线需要具有两个端口， 分别用于接入 GSM 和 CDMA的信号。 由于 GC互扰只在 CDMA的接收频率和 GSM发射频率距离较近的情况 下才有明显表现， 没有必要在所有的 GSM、 CDMA信道组合情况下， 都对 CDMA接收通路进行射频开关的切换。 因此可事先确定 GC互扰强的信道组 合， 即， 切换射频开关后 CDMA接收灵敏度可以得到改善的信道组合， 可 以在硬件驱动程序中增加一个信道组合判断， 来确定是否要切换射频开关。 图 6为才艮据本发明实施例的 GSM/CDMA双模手机抑制 GC互扰的流程示意 图， 如图 6所示： 首先， GSM基带芯片准备启动双通话犬态或双通话犬态下物理信道切 换； 启动前所述射频开关处于常通状态， 启动后所述射频开关开始切换， 使 CDMA接收通路在 "接通" 与 "断开" 的两个状态间切换， 保证在 GSM的 发射时隙断开 CDMA接收通路， 而在非 GSM的发射时隙接通 CDMA接收 通路； 其次 , GSM基带芯片和 CDMA基带芯片分别读取要使用的 GSM工作 频率和 CDMA工作频率， 手机判断是否属于临近频段， 若是， 则 GSM基带 芯片启动射频开关的切换功能， 进入双通话状态或双通话状态下信道切换， 然后结束双通话状态， 置射频开关为常通状态； 否则， 判断射频开关的切换功能是否启动， 若是， 则 GSM基带芯片置射频开 关为常通^！犬态， 进入双通话犬态或双通话犬态下信道切换， 然后结束双通话 状态； 否则， 保持射频开关为常通状态， 进入双通话状态或双通话状态下信 道切换， 然后结束双通话状态。 上述双通话状态是指手机同时在 GSM和 CDMA的方式下通话； 双通 话状态下信道切换是指原来是双通话状态， 而且因为判断 GSM和 CDMA的 工作频率间隔远而没有启动射频开关， 但目前因为外界因素 （例如， 手机移 动进入了另一个小区）需要做信道的切换， 此时判断 GSM和 CDMA的工作 频率间隔近而必须启动射频开关， 而且这种信道的切换是在保持双通话状态 下进行的。 当 GSM或者 CDMA正处在通话状态下 （称为单通话状态）， 另 一个电话 （CDMA或者 GSM ) 打进来， 手机需要判断两个通话的信道是否 属于临近信道， 如果是， 需要启动射频开关的切换功能， 并让手机进入双通 话状态。 如果手机用户需要挂断前面一路通话， 接听后面打入的电话， 或者 让前面一路通话保持， 在接听完后面一路电话后， 继续接听前面一路通话， 都属于结束双通话状态， 这时需要将射频开关再置成常通状态。 对于 GSM/CDMA双模手机， 由于工作频段的缘故， GC干扰主要表现 为 GSM900M频段的发射功率对 CDMA800M频段接收信号的干扰。 方法实施例 根据本发明的实施例，提供了一种 GSM/CDMA双模手机抑制 GC互扰 的方法， 该方法包括以下步骤：
A、 GSM基带芯片启动双通话状态或双通话状态下物理信道切换；
B、 GSM基带芯片和 CDMA基带芯片分别读取要使用的 GSM工作频 率和 CDMA工作频率， GSM/CDMA双模手机判断是否属于临近频段，若是， 则 GSM基带芯片启动射频开关的切换功能， 进入双通话状态或双通话状态 下信道切换， 至步骤 C; 否则， 判断射频开关的切换功能是否启动， 若是， 则 GSM基带芯片置射频开 关为常通 ^！犬态，进入双通话 ^！犬态或双通话 ^！犬态下信道切换 , 结束双通话 ^！犬态； 否则，保持射频开关为常通状态，进入双通话状态或双通话状态下信道切换， 结束双通话犬态； C、 结束双通话状态， 置射频开关为常通状态。 采用本发明实施例提供的技术方案， 一方面从电路上抑制了 GSM发射 对 CDMA接收的干扰， 另一方面筒化了天线设计， 降低了双天线对整机外 形和体积的要求， 增加了双模手机设计的灵活性。 另外 ,本发明的实现没有对系统架构和目前的处理流程修改，易于实现， 便于在技术领域中进行推广 , 具有较强的工业适用性。 以上所述仅为本发明的较佳实施例， 并不用以限制本发明。 应当指出， 对本领域的普通技术人员来说， 可以根据本发明的技术方案及其构思进行相 应的等同改变或替换 , 例如其它类型双模手机或者多模手机的双端口天线或 者多端口天线的实现方式。 而所有这些改变或替换， 都应包含在本发明的保 护范围之内。

Claims

权 利 要 求 书
1. 一种移动通信全球系统 GSM/码分多址 CDMA双模手机，包括： CDMA 射频电路、 GSM射频电路、 包含 CDMA基带芯片和 GSM基带芯片的 基带电路， 所述 CDMA射频电路包括 CDMA射频接收电路、 CDMA 射频发射电路和双工器， CDMA射频发射电路与 CDMA基带芯片、 双工器分别连接， 所述 CDMA射频接收电路包括依次连接的 CDMA 接收机、 接收滤波器和 LNA 即氏噪声放大器， 该 CDMA 接收机与 CDMA基带芯片连接， LNA 与双工器连接； 所述 GSM 射频电路与 GSM基带芯片连接； 其特征在于， 还包括：
双端口天线，分别与双工器、 GSM射频电路连接 ,用于接入 GSM 和 CDMA的信号；
射频开关， 设置在所述 CDMA射频接收电路中， 所述射频开关 由 GSM基带芯片控制， 用于在 GSM的发射时隙且 GSM工作频率和 CDMA工作频率属于临近频段时切断双端口天线接入的 CDMA信号。
2. 才艮据权利要求 1所述的 GSM/CDMA双模手机， 其特征在于， 所述双 端口天线是一个天线主体， 具有两个端口， 由 GSM和 CDMA天线共 用 , 分别用于接入 GSM和 CDMA的信号。
3. 根据权利要求 2所述的 GSM/CDMA双模手机， 其特征在于， 所述射 频开关位于所述 LNA与双工器之间 , 用于抑制进入 LNA的 GSM信 号强度。
4. 才艮据权利要求 2所述的 GSM/CDMA双模手机， 其特征在于， 所述射 频开关位于所述接收滤波器与 LNA之间， 用于抑制 LNA产生的非线 性产物。
5. 才艮据权利要求 2所述的 GSM/CDMA双模手机， 其特征在于， 所述射 频开关位于所述 LNA与双工器之间以及接收滤波器与 LNA之间， 用 于抑制进入 LNA的 GSM信号强度及 LNA产生的非线性产物。
6. 才艮据权利要求 1 ~ 5任一项所述的 GSM/CDMA双模手机，其特征在于 , 所述射频开关是一级或多级开关。
7. 一种 GSM/CDMA双模手机抑制 GSM/CDMA互 ·ί尤的方法， 其特征在 于， 包括步骤如下：
A、 GSM 基带芯片启动双通话状态或双通话状态下物理信道切 换；
B、 GSM基带芯片和 CDMA基带芯片分别读取要使用的 GSM工 作频率和 CDMA工作频率， GSM/CDMA双模手机判断是否属于临近 频段， 若是， 则 GSM基带芯片启动射频开关的切换功能， 进入双通话 状态或双通话状态下信道切换， 至步骤 C; 否则，
判断射频开关的切换功能是否启动， 若是， 则 GSM基带芯片置 射频开关为常通状态， 进入双通话状态或双通话状态下信道切换， 结 束双通话状态； 否则， 保持射频开关为常通状态， 进入双通话状态或 双通话状态下信道切换， 结束双通话状态；
C、 结束双通话状态， 置射频开关为常通状态。
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