CN1578169A - 手机的射频接收电路 - Google Patents

手机的射频接收电路 Download PDF

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CN1578169A
CN1578169A CNA2003101230089A CN200310123008A CN1578169A CN 1578169 A CN1578169 A CN 1578169A CN A2003101230089 A CNA2003101230089 A CN A2003101230089A CN 200310123008 A CN200310123008 A CN 200310123008A CN 1578169 A CN1578169 A CN 1578169A
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radio
frequency
cdma signal
match end
mobile phone
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CN100384091C (zh
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韩政锡
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Inspur LG Digital Mobile Communications Co Ltd
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LG Electronics China Research and Development Center Co Ltd
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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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/35—Constructional details or hardware or software details of the signal processing chain
    • G01S19/36—Constructional details or hardware or software details of the signal processing chain relating to the receiver frond end
    • 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
    • H04B1/3805—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 with built-in auxiliary receivers

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
  • Structure Of Receivers (AREA)

Abstract

本发明涉及一种防止因使用手机GPS One功能时的CDMA信号影响而造成GPS全球定位系统接收灵敏度下降的技术。本发明由如下几个部分构成：开关(41)，它根据CDMA信号功率水平，把CDMA信号切换到第1射频匹配端(42)或第2射频匹配端(43)；第1射频匹配端(42)，用于当上述CDMA信号功率强度比基准功率小时，不减小该CDMA信号功率而直接进行匹配；第2射频匹配端(43)，用于当上述CDMA信号功率强度比基准功率大时，把该CDMA信号功率减小到既定水平并进行匹配；低噪声放大器(44)，对通过上述第1射频匹配端(42)或第2射频匹配端(43)输入的CDMA信号进行低噪声放大。

Description

手机的射频接收电路
技术领域
本发明涉及一种防止因使用手机GPS One功能时的CDMA信号影响而造成GPS全球定位系统接收灵敏度下降的技术，特别是一种在CDMA信号功率较高的环境下，GPS全球定位系统灵敏度也不受特别影响的手机的射频接收电路。
背景技术
图1是以往手机中的射频接收端框图。如图所示，在低噪声放大器(LNA)(12)的前端，带有以混合形式实现CDMA模式与GPS全球定位系统模式的射频(RF：  Radio Frequency)匹配端(11)，下面参照图2及图3对其作用进行说明。
作为手机中的全球定位系统(GPS)解决方案的GPS One功能，是通过在射频匹配端(11)切换GPS全球定位系统信号路径与CDMA路径来执行的。
即，如果用户请求定位服务(例如：E911)，则射频匹配端(11)利用CDMA通话信道接收与GPS全球定位系统卫星信息有关的数据，计算终端的伪距离(pseudorange)，并将伪距离计算结果等信息数据发送给PDE(PDE：Position Determination Entity-定位实体)。
图3a是上述射频匹配端(11)的电路图。如图所示，可以得知它是由电容(C31、C32)和线圈(L31)构成的。图3b是把射频匹配端(11)接触的PCB印刷电路板线(11A)的特定阻抗值设置成既定值(例如：50欧姆)的例子。
在如上以往技术手机的射频匹配端中，由于以混合形式一起使用CDMA模式和GPS全球定位系统模式两种功能，所以，在射频路径上，CDMA信号会对GPS全球定位系统性能产生干扰影响。即，当射频接收端接收的CDMA信号的功率强度大时，对GPS全球定位系统路径产生干扰影响，致使GPS全球定位系统接收灵敏度下降，终端的卫星搜索性能降低，对伪距离计算的确认性下降，所以最终难以正确计算用户的位置。
发明内容
因此，本发明的目的在于提供一种手机的射频接收电路，以便在终端执行GPS One功能时，能够在射频路径上最大限度地减小对GPS全球定位系统性能造成影响的CDMA信号的干扰影响并进行接收。
附图说明
图1是以往手机中的射频接收端框图。
图2是以往技术的GPS One动作信号流程图。
图3a及图3b是图1中射频匹配端实施例的详细电路图。
图4是本发明手机的射频接收电路的框图。
图5a及图5b是图4中射频匹配端实施例的详细电路图。
图6是本发明的GPS One动作信号流程图。
具体实施方式
图4是本发明手机的射频接收电路的一个实施例框图。如图所示，它由如下几个部分构成：开关(41)，它根据CDMA信号功率与基准功率的比较结果，把CDMA信号切换到第1射频匹配端(42)或第2射频匹配端(43)；第1射频匹配端(42)，用于当上述CDMA信号功率强度比基准功率小时，不减小该CDMA信号功率而直接进行匹配；第2射频匹配端(43)，用于当上述CDMA信号功率强度比基准功率大时，把该CDMA信号功率减小到既定水平并进行匹配；低噪声放大器(44)，对通过上述第1射频匹配端(42)或第2射频匹配端(43)输入的CDMA信号进行低噪声放大。下面参照图5及图6，详细说明如上构成的本发明的作用。
如果用户请求定位服务(例如：E911)，则执行作为终端的GPS全球定位系统解决方案的GPS One功能。这时，终端的微处理器(例如：MSM)把识别的CDMA信号功率强度与基准功率进行比较，如果判断比该基准功率小，则执行通常的GPS One功能。即，计算终端的伪距离，并把该计算结果和必要的信息数据传输到PDE。(S1-S4)
但是，如果上述比较结果判断识别的CDMA信号功率强度比基准功率大，那么开关(41)自动切换到减小接收的CDMA信号功率强度的第2射频匹配端(43)。(S5)
作为这时的上述第2射频匹配端(43)的实施例，可以象图5a中第2射频匹配端(43A)一样，利用电阻(R51)减小接收信号的强度，也可以象图5b中第2射频匹配端(43B)一样，作为衰减(loss)元件，插入具有既定特性阻抗值的印刷电路板线(PCB_L)来构成。这种结构设计恰当，保证不对CDMA性能造成影响。
作为参照，上述基准功率设置成认为CDMA信号不会对终端GPS全球定位系统性能造成影响的功率强度。
之后，计算终端的伪距离，把该计算结果和必要的数据传输给PDE，然后开关(41)切换到原来的射频匹配端，即第1射频匹配端(42)。(S6-S8)
结果，即使接收了很大强度的CDMA信号，由于上述动作，CDMA信号也不会对GPS全球定位系统灵敏度造成特别的影响，因此，终端能够在最佳的条件下搜索卫星，向PDE传输包括正确的伪距离在内的数据，用户在危急情况下，也能够正确计算位置。
如上述所作的详细说明，本发明能够在终端执行GPS One功能时，在射频路径上最大限度地减小对GPS全球定位系统性能造成影响的CDMA信号的干扰影响并进行接收，从而具有这样的效果，即，由于终端的卫星搜索性能提高，对伪距离计算的正确性提高，所以能够更正确地跟踪用户位置。

Claims (4)

1.一种手机的射频接收电路，其特征是由如下几个部分构成：开关(41)，它根据CDMA信号功率水平，把CDMA信号切换到第1射频匹配端(42)或第2射频匹配端(43)；第1射频匹配端(42)，用于当上述CDMA信号功率强度比基准功率小时，不减小该CDMA信号功率而直接进行匹配；第2射频匹配端(43)，用于当上述CDMA信号功率强度比基准功率大时，把该CDMA信号功率减小到既定水平并进行匹配；低噪声放大器(44)，对通过上述第1射频匹配端(42)或第2射频匹配端(43)输入的CDMA信号进行低噪声放大。
2.根据权利要求1所述的手机的射频接收电路，其特征是：基准功率是CDMA信号不会对终端GPS全球定位系统性能造成影响的功率强度。
3.根据权利要求1所述的手机的射频接收电路，其特征是：第2射频匹配端(43)的结构是，通过电容(C53)把上述开关(41)的一侧固定端子连接到接地电容(C54)，连续通过线圈(L52)及电阻(R51)，把该连接点连接到低噪声放大器(44)的输入端。
4.根据权利要求1所述的手机的射频接收电路，其特征是：第2射频匹配端(43)的结构是，连续通过具有既定的特性阻抗值的印刷电路板线(PCB_L)和电容(C53)，把上述开关(41)的一侧固定端子连接到接地电容(C54)，连续通过线圈(L52)及电阻(R51)把该连接点连接到低噪声放大器(44)的输入端。
CNB2003101230089A 2003-07-09 2003-12-23 手机的射频接收电路 Expired - Fee Related CN100384091C (zh)

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CN110933838A (zh) * 2019-12-05 2020-03-27 捷开通讯(深圳)有限公司 射频电路及其线路版图结构
CN110933838B (zh) * 2019-12-05 2021-01-05 捷开通讯(深圳)有限公司 射频电路及其线路版图结构

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US20050009482A1 (en) 2005-01-13
KR20050006571A (ko) 2005-01-17
PT1496619E (pt) 2007-02-28
CN1578166A (zh) 2005-02-09
EP1496619A1 (en) 2005-01-12
KR100531879B1 (ko) 2005-11-29
ES2276195T3 (es) 2007-06-16
DE602004003431D1 (de) 2007-01-11
CN100384091C (zh) 2008-04-23
ATE347193T1 (de) 2006-12-15
EP1496619B1 (en) 2006-11-29
CN100370693C (zh) 2008-02-20
DE602004003431T2 (de) 2007-03-15

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