CN101958734A - Integrated wireless coverage solution - Google Patents

Integrated wireless coverage solution Download PDF

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CN101958734A
CN101958734A CN2010105116805A CN201010511680A CN101958734A CN 101958734 A CN101958734 A CN 101958734A CN 2010105116805 A CN2010105116805 A CN 2010105116805A CN 201010511680 A CN201010511680 A CN 201010511680A CN 101958734 A CN101958734 A CN 101958734A
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signal
frequency
downlink
tracking
doppler
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CN2010105116805A
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CN101958734B (en
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窦怀宇
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京信通信系统(中国)有限公司
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Abstract

The invention discloses an integrated wireless coverage solution which is used for realizing signal relay and eliminating Doppler frequency offset caused by high-speed operation in a signal. The solution comprises the following steps: a Doppler frequency offset tracking unit is added for obtaining a frequency error function between a downlink pilot signal contained in a downlink intermediate-frequency signal and a reference signal, and the function value is maintained at zero by adjusting the frequency of the signal generated by a controlled frequency source so as to control the downlink tracking signal generated by the controlled frequency source; the downlink tracking signal is mixed with the downlink signal via a lower variable frequency channel of a down link to eliminate forward Doppler frequency offset; and an uplink tracking signal, namely a backward Doppler frequency offset signal of the downlink tracking signal is mixed with an uplink signal via an upper variable frequency channel of an uplink to preset backward Doppler frequency offset. The solution of the invention can help effectively eliminate the Doppler frequency offset in communication between a mobile station in a high-speed motion carrier and a base station or a remote radio unit, thus playing a role in ensuring communication quality.

Description

无线覆盖整体解决方案 Wireless coverage overall solution

【技术领域】 TECHNICAL FIELD

[0001] 本发明涉及移动通信的无线网络覆盖优化领域,尤其涉及一种无多普勒频移中继装置和相应的中继方法,进而提出一种高速列车无线覆盖系统、方案,以适用于高速移动载体上的移动通信应用。 [0001] The present invention relates to a mobile communication wireless network coverage optimization, and more particularly relates to an apparatus and a Doppler shift corresponding to the relay method of the relay, and further proposed a high-speed train radio coverage system, program, to apply to high-speed mobile applications on the mobile communication carrier.

【技术背景】 【technical background】

[0002] 在高速铁路移动通信环境中,若采用基站对铁路区域直接进行无线覆盖,为了避免频繁的越区切换,每个基站的覆盖半径需要达到十公里以上,对于线状的铁路区域来说, 这种基站直接覆盖方式的效率很低。 [0002] In the high-speed railway mobile communication environment, the use of a wireless base station coverage area railway directly, in order to avoid frequent handover, the radius of coverage of each base station needs more than 10 kilometers for the linear region for railway efficiency, which directly cover the base station is low. 为了提高覆盖效率,可以采用基站加射频拉远单元的方式实现无线覆盖。 In order to improve the efficiency of coverage, wireless coverage can be added by way of the radio base station remote units. 一个基站可以配置多个射频拉远单元,沿铁路一字排开。 The base station can configure a plurality of remote radio units lined up along the railway. 相对于基站的覆盖半径而言,每个射频拉远单元的覆盖半径都不大,因此可以很容易实现对十公里以上的线状铁路区域的有效覆盖。 With respect to the coverage radius of the base station, the coverage radius of each of the radio remote unit is not large, it is possible to easily implement effective coverage of more than ten kilometers of railway line region.

[0003] 由于一个基站配置了多个射频拉远单元,因此在两个射频拉远单元的重叠覆盖区中,列车车厢内的移动台将收到来自两个不同方向射频拉远单元发送的同一个基站的信号。 [0003] Since the base station is configured with a plurality of radio remote unit, thus overlapping coverage area of ​​two radio remote unit, a mobile station in train compartments will receive the same from two different directions of transmission radio remote unit a signal of the base station. 如果移动台无法区分这两个方向的信号,那么这两个信号相互之间便构成了人为的多径干扰,使通信质量严重下降。 If the mobile station can not distinguish between signals of the two directions, then the two signals with each other constitute the artificial multipath interference, a serious decline in quality of the communication. (注:在以基站加射频拉远单元覆盖的高速铁路移动通信环境中,信号从射频拉远单元到列车之间有很强的直达路径,因此自然多径干扰要比人为多径干扰弱得多,故这里主要考虑人为多径干扰。) (Note: in addition to the base station radio remote unit covers the high-speed railway mobile communication environment, radio signals from the remote unit to a strong direct path between the trains, thus natural than artificial multipath interference multipath interference too weak more, it is the main consideration here artificial multipath interference.)

[0004] 假设移动台可以区分这两个方向的人为多径信号,那么就可以使用多径分集合并的方法来利用这些信号。 Artificial multipath signal [0004] assumed that the mobile station can distinguish the two directions, then you can use multipath diversity combining methods to use these signals. 由于在高速移动的环境下,这两个方向的信号都引入了很大的多普勒频移,且频移的方向相反,因此在合并之前需要分别消除这两个方向信号各自的多普勒频移。 Since the high-speed moving environment, the signals of the two directions have introduced large Doppler shift and the frequency shift in the opposite direction, before merging the two directions necessary to eliminate the respective Doppler signals, respectively frequency shift.

[0005] 综上所述,为了提高高速铁路移动通信环境中通信的质量,需要有效地解决以下问题,即: [0005] In summary, in order to improve the quality of high-speed railway mobile communication environment for communication, the need to effectively address the following issues, namely:

[0006] 1、区分不同方向的信号。 [0006] 1, to distinguish between signals of different directions.

[0007] 2、消除不同方向信号各自的多普勒频移。 [0007] 2, the respective signals in different directions to eliminate the Doppler shift.

[0008] 3、合并不同方向的信号,从而消除人为多径干扰。 [0008] 3, the combined signals in different directions, thereby eliminating the artificial multipath interference.

[0009] 为了消除多普勒频移,提高高速移动交通工具中移动台与固定基站或射频拉远单元之间的通信质量,有如下方式可供参考: [0009] In order to eliminate the Doppler shift, to improve the high-speed moving vehicle and the fixed base station or a mobile station radio communication quality between the remote unit, with reference to the following options are available:

[0010] 其一是在基站中引入多普勒频移校正功能,这种方式中,基站需要面对多个不同移动方向和移动速率的移动台,因此需要针对不同移动台多普勒频移的方向和大小分别进行跟踪和抵消,实现起来较为复杂; [0010] one base station is introduced in the Doppler shift correction function, this way, the base station needs to face a plurality of different mobile stations moving direction and speed, thus requiring the Doppler frequency shift for different mobile stations direction and magnitude of tracking and canceling respectively, are complex to implement;

[0011] 其二是在移动台中引入多普勒频移校正功能,考虑到移动台的成本、体积、功耗、 散热等因素,以及当移动台置于高速移动交通工具中被交通工具屏蔽作用所影响从而影响校正精度等,故其可行性相对不高; [0011] the other is incorporated in the mobile station is moving at high speed transport vehicle shielding Doppler shift correction function, the mobile station in consideration of cost, size, power consumption, heat and other factors, as well as when the mobile station is placed thus correcting the influence of the impact accuracy, so the feasibility relatively high;

[0012] 再者,作为本发明被提出的基础,可以在交通工具上放置一个直放站作为中继装置,将固定基站或射频拉远单元的信号直放后对交通工具内部进行覆盖。 [0012] Further, as a basis for the present invention has been made, the repeater can be placed on a vehicle as a relay device, a radio frequency signal to a fixed base station or remote unit after direct amplification of the vehicle interior covering. 此时,直放站相对于交通工具内部的移动台而言是静止或低速移动的,但是相对于基站或射频拉远单元而言却是高速移动的。 At this time, the inside of the repeater with respect to the vehicle in terms of the mobile station is stationary or moving at low speed, but with respect to the base station or the remote radio unit is in terms of high-speed movement.

[0013] 这种移动直放站与传统的固定直放站的根本区别就在于移动直放站需要具备区分信号、消除多普勒频移及合并信号的功能,为固定基站或射频拉远单元与高速移动交通工具中移动台之间的通信提供一个无多普勒频移的无线覆盖环境。 [0013] Such a conventional mobile repeater and the repeater fundamental difference is that the fixed mobile repeater requires distinguish the signal to eliminate the Doppler shift function and the combined signal, a fixed base station or radio remote unit and communication between mobile stations moving at high speed to provide a vehicle no Doppler shift of the radio coverage environment. 其中消除多普勒频移功能的实现,是本发明的重点所在。 Which achieve the elimination of the Doppler shift function, it is the focus of the present invention.

【发明内容】 [SUMMARY]

[0014] 与前述相呼应,本发明的首要目的就是要提供一种无多普勒频移中继装置,使由其实现中继的两端的设备间的信号能去除因高速移动或其它原因所产生的多普勒频率偏移因素,保证信号的正常通信质量。 [0014] with the echoes, the primary object of the present invention is to provide a relay apparatus without Doppler shift, achieved by making both ends of the signal between the relay device can be removed by high-speed movement or other reasons Doppler frequency shift resulting factors, to ensure the normal communication quality of a signal.

[0015] 本发明的另一目的在于提供一种无多普勒频移中继方法,在相互通信的信号路径中去除因高速移动或其它原因所引起的信号的多普勒频移,保障通信质量。 [0015] Another object of the present invention is to provide a non-relay method Doppler shift, removal of the signal due to high-speed movement or other reasons in the signal path caused by mutual communication of the Doppler shift, to protect the communication quality.

[0016] 本发明的再一目的在于提供一种高速列车无线覆盖系统,使高速列车内的移动台与车外移动通信网络之间的信号实现无多普勒频移传输,保证移动台的通信质量。 [0016] A further object of the present invention is to provide a high-speed train radio coverage system, a signal between a mobile station outside the vehicle in the high speed mobile communication network train Doppler shift-free transmission, to ensure communication with the mobile station quality.

[0017] 本发明的再一目的在于提供一种高速列车无线覆盖方案,以图适用高铁发展的需要。 [0017] A further object of the present invention is to provide a high-speed train radio coverage scheme, needs to be applied to FIG HSR development.

[0018] 本发明最后一个目的在于提供一种多普勒频移跟踪单元,以实现本发明产品的通用性,便于标准化生产、安装和维护。 [0018] A final object of the present invention to provide a Doppler shift tracking unit, in order to achieve universal product of the invention facilitate the standardization of production, installation and maintenance.

[0019] 为实现该目的,本发明采用如下技术方案: [0019] In order to achieve this object, the present invention adopts the following technical solution:

[0020] 本发明的一种多普勒频移跟踪单元,用于跟踪中继装置的因高速运动而引起的信号的多普勒频率偏移,该跟踪单元包括: [0020] A according to the present invention, the Doppler shift tracking unit, a signal caused by a high speed motion tracking relay device Doppler frequency shift, the tracking unit comprises:

[0021] 耦合器,用于在中继装置下行链路的射频前端中耦合出一路下行信号; [0021] coupler for coupling the front end all the way down signal in a radio frequency downlink relay apparatus;

[0022] 受控频率源,在校正单元的控制下产生包含下行正向多普勒频移因子的下行跟踪信号; [0022] The controlled frequency source to generate a downlink signal including downlink forward tracking the Doppler shift factor is under the control of the correction unit;

[0023] 下变频通道,以受控频率源产生的下行跟踪信号的频率为基准,将下行信号进行下变频; [0023] downconversion channel, a downlink frequency tracking signal produced by the controlled reference frequency source, the frequency of the downlink signal;

[0024] 参考单元,用于产生一供校正单元参照的参考信号; [0024] The reference cell for generating a reference signal for correcting a reference cell;

[0025] 校正单元,用于求取下变频后的下行信号所包含的下行导频信号与所述参考信号之间的频率误差函数,并调节受控频率源产生的下行跟踪信号的频率使该函数值维持为零; [0025] The correcting unit, a downlink signal for a downlink pilot downconverted obtaining the pilot signal included in the error function between the reference frequency signal, and adjusting the frequency of a downlink tracking signal generated by the controlled frequency source such that the function value is maintained at zero;

[0026] 变换单元,将该下行跟踪信号变换为包含上行反向多普勒频移因子的上行跟踪信号。 [0026] conversion unit, the tracking signal into a downlink an uplink reverse uplink signal tracking Doppler shift factor.

[0027] 根据本发明一实施例所揭示,所述参考单元包括倍频器和中继装置固有的基准频率源,基准频率源产生的信号经倍频器倍频后成为所述参考信号。 [0027] According to an embodiment of the present invention disclosed embodiment, the reference cell comprising a reference frequency source inherent multiplier and the relay device, the reference frequency signal by the frequency source frequency multiplier generating the reference signal becomes.

[0028] 根据本发明另一实施例所揭示,所述参考单元包括倍频器和所述受控频率源,受控频率源产生的下行跟踪信号经倍频器倍频后成为所述参考信号。 [0028] According to another embodiment of the disclosed embodiment of the present invention, the reference unit comprises a multiplier and the controlled frequency source, the downlink tracking signal frequency multiplier becomes controlled frequency source generating the reference signal .

[0029] 对应于校正单元工作在模拟域或数字域,所述受控频率源为压控晶体振荡器(VCXO)或数字控制振荡器(NCO)。 [0029] corresponding to the correction unit operates in the analog domain or the digital domain, said controlled frequency source is a voltage controlled crystal oscillator (VCXO) or a numerically controlled oscillator (NCO).

[0030] 所述受控频率源与下变频通道之间串接一倍频器对受控频率源产生的下行跟踪信号进行倍频运算。 [0030] The controlled frequency source connected in series between a downlink channel and downconverts a tracking signal of the controlled frequency source frequency multiplier multiplies the generated operation.

[0031] 该跟踪单元还包括滤波器,其串接于下变频通道和校正单元之间,将下变频后的下行信号进行滤波后传输给所述校正单元。 [0031] The tracking unit further comprises a filter which is connected in series to the transmission of the frequency correction channel between the unit and the correcting unit, the downlink signal downconverted filtered.

[0032] 所述变换单元包括: [0032] The conversion unit comprises:

[0033] 倍频器,用于对中继装置既有的基准频率源产生的信号进行预设倍数的倍频运算; [0033] The frequency multiplier, a signal to the relay apparatus existing reference frequency source frequency generated by a multiple of a predetermined calculation;

[0034] 混频器,利用该倍频器的运算结果与下行跟踪信号进行混频从而产生所述上行跟踪信号; [0034] mixer, using the calculation result of the multiplier downlink mixes to produce the tracking signal tracking the uplink signal;

[0035] 滤波器,用于对所述上行跟踪信号进行滤波后输出。 [0035] The filter for the uplink and outputs the tracking signal is filtered.

[0036] 本发明的一种无多普勒频移中继装置,用于实现信号中继并消除因高速运动而引起的信号的多普勒频率偏移,其包括下行链路和上行链路,还包括: [0036] A present invention is not the Doppler shift relay means for relaying a signal to realize high-speed movement and the cancellation signal caused by the Doppler frequency shift, including uplink and downlink ,Also includes:

[0037] 前述的多普勒频移跟踪单元; [0037] Doppler shift of the tracking unit;

[0038] 下行链路中的下变频通道,以该跟踪单元输出的下行跟踪信号为本振对下行链路中的下行信号进行混频以消除下行信号中的正向多普勒频移; [0038] The downconversion downlink channels to the downlink tracking unit tracking signal outputted from a local oscillation signal of the downlink downlink mixes downstream signal to eliminate the Doppler shift in the forward direction;

[0039] 上行链路中的上变频通道,以该跟踪单元输出的上行跟踪信号为本振对上行链路中的上行信号进行混频以在上行信号中预置反向多普勒频移。 [0039] uplink channel upconverted to an uplink tracking signal outputted from the tracking unit uplink signal in the uplink mixes a preset reverse uplink signal in the Doppler shift of a local oscillation.

[0040] 该装置包括施主天线和受主天线,施主天线用于与基站或射频拉远单元无线电性连接,受主天线用于与移动台无线电性连接。 [0040] The receiving apparatus includes a donor antenna and a main antenna, or the donor antenna with a base station for radio remote unit connected to the radio, receiving main antenna for connection with the mobile station of the radio. 所述施主天线采用全向或定向天线,所述受主天线采用一体纵长的泄漏电缆。 The donor antenna omnidirectional or directional antenna, the receiving antenna with integrated main longitudinal leaky cable.

[0041] 所述基准频率源采用稳定度优于士0. Olppm的晶体振荡器。 The [0041] use of the reference frequency source stability better than 0. Olppm disabilities crystal oscillator.

[0042] 本发明的一种无多普勒频移中继方法,用于实现信号中继并消除信号中因高速运动而引起的多普勒频率偏移,其包括如下步骤: [0042] A present invention is not the Doppler shift relay method for relaying signals implement and eliminate the Doppler frequency offset due to the high-speed signal due to the movement, comprising the steps of:

[0043] 1)从下行链路射频前端中耦合出一路下行信号; [0043] 1) all the way down signal coupled out from the downlink RF front end;

[0044] 2)产生一下行跟踪信号; [0044] 2) generating a downlink tracking signal;

[0045] 3)以下行跟踪信号为基准将该射频下行信号下变频至中频或零中频域; [0045] 3) The following reference will row of the tracking signal at a radio frequency downlink signal is downconverted to an intermediate frequency or a zero intermediate frequency domain;

[0046] 4)求取该中频或零中频域下行信号所包含的下行导频信号与一个供参照的参考信号之间的频率误差函数,并调节步骤3)中产生下行跟踪信号的频率,以使该函数值维持为零; [0046] 4) obtains the frequency of the downlink pilot field of a downlink IF or zero IF frequency signal included in the frequency error function between the signal and the reference signal for a reference, and the adjusting step 3) generating the downlink tracking signals to the function value is maintained at zero;

[0047] 5)对于下行链路,以该下行跟踪信号为本振对下行信号进行混频以消除下行信号中的正向多普勒频移; [0047] 5) For the downlink, the downlink tracking signal to the downlink signal mixes a local oscillation signal in order to eliminate the forward downlink Doppler shift;

[0048] 6)对于上行链路,先将该下行跟踪信号变换为预置反向多普勒频移的上行跟踪信号,再以该上行跟踪信号为本振对上行信号进行上变频,以在上行信号中预置反向的多普勒频移。 [0048] 6) For the uplink, the downlink first signal into the preset counter tracking the Doppler shift of the uplink tracking signal, and then the tracking signal to the uplink signal on the uplink frequency of a local oscillation to the reverse uplink signal preset Doppler shift.

[0049] 根据本发明一实施例所揭示,所述步骤4)中的参考信号由一基准频率源产生的信号经倍频运算后获得。 [0049] According to one embodiment of the disclosed embodiment of the present invention, the operation frequency reference signal by the signal of the step 4) is produced by a reference frequency source is obtained.

[0050] 根据本发明另一实施例所揭示,所述步骤4)中的参考信号由所述步骤2)的下行跟踪信号经倍频运算后获得。 [0050] According to another embodiment of the disclosed embodiment of the present invention, the reference signal in the step 4) is obtained after the step 2) of the downlink signal frequency tracking operation. [0051] 步骤4)若采用模拟方式执行,所述下行跟踪信号由一受控的压控晶体振荡器(VCXO)产生,若采用数字方式执行,则由数字控制振荡器产生(NCO)。 [0051] Step 4) When performing analog mode, the downlink tracking signal generated by a controlled voltage controlled crystal oscillator (the VCXO), if performed digitally, generated by a numerically controlled oscillator (NCO).

[0052] 所述步骤3)中的下行跟踪信号已经过倍频运算。 Downlink tracking signal in [0052] step 3) has been frequency operation.

[0053] 所述步骤4)中的中频域或零中频域下行信号已经过滤波。 [0053] step 4) in the frequency domain or frequency domain zero down signal wave has been filtered.

[0054] 步骤6)中,所述上行跟踪信号由所述下行跟踪信号与一基准频率源产生的信号的倍频运算结果混频后滤波而得。 [0054] Step 6), the uplink frequency calculation result signal by the downlink tracking signal with a reference frequency source generating a tracking signal obtained by mixing the filtered.

[0055] 本发明的一种高速列车无线覆盖系统,其采用前述的无多普勒频移中继装置,其施主天线外置于高速列车顶部,其受主天线沿高速列车的车厢一体纵长布设。 [0055] a high-speed train radio coverage of the system of the invention, which uses the Doppler shift without relay apparatus placed on top of donor antenna to its high-speed trains, by which high-speed train carriage main antenna along the longitudinal integrally layout.

[0056] 本发明的一种高速列车无线覆盖方案,适用于相对无线中继站高速移动的列车, 其包括如下步骤: [0056] a high-speed train radio coverage of the present invention, suitable for relatively high-speed movement of the radio relay station train, comprising the steps of:

[0057] 1)在高速列车上装设直放站,并设置该直放站在任意时刻只接收一个方向的基站或射频拉远单元信号,忽略其它方向的信号; [0057] 1) high-speed trains mounted on the repeater, the repeater receives and arranged in one direction at any moment only the base station or radio remote unit signal, ignoring signals from other directions;

[0058] 2)为该直放站的下行链路提供能够跟踪正向多普勒频移的下行跟踪信号,为该直放站的上行链路提供预置了反向多普勒频移的上行跟踪信号。 [0058] 2) provides for the ability to track the downlink repeater forward downlink tracking Doppler frequency shift signal, for providing pre-repeater uplink Doppler shift in the reverse an uplink tracking signal.

[0059] 3)将下行跟踪信号用于该直放站下行链路的下变频通道和上变频通道中,消除因列车相对移动而在下行信号中引入的多普勒频移,以便列车内移动台接收到无多普勒频移的下行信号; [0059] 3) a tracking signal for the downlink channel of the repeater downconversion and upconversion downlink channels, due to relative movement of the train and eliminating the introduction of the downlink signal in the Doppler shift, to move a train station receives the downlink signal without the Doppler shift;

[0060] 4)将上行跟踪信号用于该直放站的上行链路的下变频通道和上变频通道中,在上行信号中预置反向的多普勒频移,以便无线中继站接收到无多普勒频移的上行信号。 [0060] 4) tracking signal for the uplink channel uplink downconversion and upconversion of the repeater channel, preset in the reverse uplink signal Doppler shift, so that the radio relay station receives no Doppler shifted uplink signal.

[0061] 与现有技术相比,由于本发明在中继装置上实现了多普勒频移校正功能,适用于诸如选频、移频、宽频之类的直放站,对基站或射频拉远单元等无线中继站和移动台没有任何影响,因此可以直接应用于任何现有的和计划建造的移动通信网络中,也即其具有较高的可移植性和应用可行性。 [0061] Compared with the prior art, since the present invention is implemented in a relay apparatus Doppler shift correction function, such as a suitable selected frequency, frequency shift, wideband repeater or the like, or remote radio base station no other remote unit radio relay station and the mobile station any influence, it can be directly applied to any mobile communication network and the existing programs in the construction, i.e. it has a higher portability and feasibility. 相对传统技术在基站及射频拉远单元或移动台中消除多普勒频移的技术而言,其具有明显的进步性,具体表现在: Relative to conventional techniques in the base station and radio remote unit or mobile station to eliminate the Doppler shift in the art, the significant progress that has properties, in particular in:

[0062] 其一,在中继装置中引入多普勒频移校正功能与在基站(或射频拉远单元)中引入该功能相比主要有以下优点: [0062] First, the introduction of the relay apparatus and the Doppler shift correction function is introduced into the base station (or radio remote unit) mainly has the following advantages:

[0063] 1、基站需要面对多个不同移动方向和移动速率的移动台,因此需要针对不同移动台多普勒频移的方向和大小分别进行跟踪和抵消,实现起来复杂;而中继装置(移动直放站)只需面对一个方向的基站或射频拉远单元,因此只需跟踪和抵消一个方向和大小的多普勒频移,实现起来简单; [0063] 1, a plurality of different base stations need to face the moving direction and the moving speed of the mobile station, frequency shift direction is required and the size of each track and Doppler offset for different mobile stations, complex to implement; and the relay means (mobile repeater) facing in one direction only base station or radio remote unit, so that only a tracking offset and the direction and magnitude of the Doppler shift, is simple to implement;

[0064] 2、中继装置(移动直放站)可以充分利用下行导频信号进行多普勒频移的校正; 而在基站中,若上行信号中没有导频信号,则无法做到这一点,造成技术实现上无法克服的先天性缺陷。 [0064] 2, the relay device (mobile repeater) can take advantage of a downlink pilot signal is a Doppler shift correction; and the base station, uplink signal when no pilot signal is unable to do this , resulting in the technology can not be overcome birth defects.

[0065] 其二,在中继装置(移动直放站)中引入多普勒频移校正功能与在移动台中引入该功能相比则优势更加明显: [0065] Second, the introduction of the relay device (mobile repeater) the Doppler shift correction function and introduced into the mobile station is compared to the more obvious advantages:

[0066] 1、移动台对成本、体积和功耗有着苛刻的要求,而对于移动直放站则宽松得多。 [0066] 1, the mobile station has stringent requirements for cost, size and power consumption, and is much more lenient for the mobile repeater. 移动直放站相当于为交通工具内所有移动台提供了一个公共的射频前端,将每个移动台的多普勒频移校正功能集中到一个移动直放站中实现,比分散在各个移动台中实现更为合理; Providing the mobile repeater corresponding to all mobile stations within the vehicle a common RF front end, each mobile station Doppler frequency shift correction function into one mobile repeater is implemented, each mobile station ratio distribution achieve a more rational;

[0067] 2、移动直放站可以使用置于交通工具之外的定向跟踪天线(主要是指其施主天线)以及高稳定度的基准频率源,消除交通工具的屏蔽作用,提高多普勒频移校正的精度; 而在移动台中,这些都是难以实现的。 [0067] 2, the mobile repeater can be placed outside the vehicle tracking directional antenna (which mainly refers to a donor antenna) and a reference frequency source of high stability, eliminating the shielding effect of the vehicle, improved Doppler shift correction accuracy; and in a mobile station, which are difficult to achieve.

【附图说明】 BRIEF DESCRIPTION

[0068] 图1是本发明无多普勒频移中继装置应用场景示意图。 [0068] FIG. 1 is a schematic diagram of non Doppler shift according to the present invention, the relay device application scenario.

[0069] 图2是本发明第一实施例中无多普勒频移中继装置的原理框图,该实施例适用于中频方案。 [0069] FIG 2 is a first embodiment of the present invention without a functional block diagram of the Doppler shift of the relay apparatus, this embodiment is applicable to IF method.

[0070] 图3是本发明第一实施例中多普勒频移跟踪单元的原理框图。 [0070] FIG. 3 is a schematic block diagram of a Doppler shift in the tracking unit of the first embodiment of the present invention.

[0071] 图4是本发明第二实施例中无多普勒频移中继装置的原理框图,该实施例适用于零中频方案。 [0071] FIG 4 is a second embodiment of the present invention, no functional block diagram of the Doppler shift of the relay apparatus, this embodiment is applicable to zero-IF method.

[0072] 图5是本发明第二实施例中多普勒频移跟踪单元的原理框图。 [0072] FIG. 5 is a schematic block diagram of a second embodiment of the present invention, the Doppler shift of the tracking unit.

[0073] 图6是本发明第三实施例中无多普勒频移中继装置的原理框图,其由第一实施例的中频方案派生出一统一中频方案。 [0073] FIG 6 is a third embodiment of the present invention, no functional block diagram of the Doppler shift of the relay apparatus which IF method is implemented by a first embodiment of a unified derive IF method.

[0074] 图7是本发明第四实施例中无多普勒频移中继装置的原理框图,其由第二实施例的零中频方案派生出一统一零中频方案。 [0074] FIG. 7 is a fourth embodiment of the present invention, no functional block diagram of the Doppler shift of the relay apparatus, which derive a unified scheme of zero zero IF IF method of the second embodiment.

【具体实施方式】 【Detailed ways】

[0075] 下面结合附图和实施例对本发明作进一步的说明: Drawings and embodiments of the present invention will be further described [0075] below with:

[0076] 作为一个综合的高速列车无线覆盖方案,其具体应用即本发明的高速列车无线覆盖系统的应用场景如图1所示。 [0076] As a high-speed train integrated wireless coverage embodiment, the specific application scenarios of the present invention, i.e., high speed train wireless coverage system shown in Figure 1. 在高速移动的载体(以高速铁路的列车之类的交通工具为例)101上,安装两个移动直放站111、112,两个移动直放站111、112由本发明后述的无多普勒频移中继装置实现。 Carrier moving at high speed (at high speed railway vehicle train or the like for example) 101, 111, 112 mounted two mobile repeater, two mobile repeater 111 of the present invention described later by the Doppler-free Doppler shift relay implementation. 每个移动直放站各有一个具备定向跟踪能力的施主天线或共享一个全向施主天线,分别接收前、后两个最近的基站或射频拉远单元122、121的信号,与基站或射频拉远单元无线电性连接实现通信。 Each mobile includes a repeater donor antenna each or a shared orientation tracking capability donor omnidirectional antennas, respectively before receiving, signal unit 122, 121 of the two closest base station or the remote radio, the radio base station or pull The radio remote unit connected for communication. 两个移动直放站通过合路器(未示出)共用一个受主天线(即与移动台无线电性连接实现通信的天线),这个受主天线采用一条覆盖载体内部即沿列车车厢纵长方向一体纵长布设的泄漏电缆。 By two mobile repeater multiplexer (not shown) by a common primary antenna (i.e., the mobile station connected to the radio antenna communication implementation), the main antenna by using a carrier covering the internal i.e. along the longitudinal direction of the train cars one vertically long leaky cable laid.

[0077] 无论采用定向跟踪还是全向施主天线,都要保证每个移动直放站只能收到列车前、后两个方向中一个方向的基站或射频拉远单元信号,其它方向的信号小到可以忽略。 [0077] Whether or omni directional donor antenna tracking, should ensure that each repeater only receive before moving train, a base station or a radio frequency in the two directions of a direction remote unit signal, the signal direction of the other small to be ignored. 前者是靠空分复用来保证,后者则是靠频分、时分或码分复用来保证。 The former is used to ensure by space division multiplexing, the latter is by frequency division, time division or code division multiplexing guaranteed. 因此可以近似认为每个移动直放站只引入了一个方向的多普勒频移,每个移动直放站一旦消除了多普勒频移,高速列车上的无线覆盖环境即视为无多普勒频移的无线覆盖环境。 Thus each of the mobile repeater that can be approximated only introduces a Doppler shift direction, each of the mobile repeater is eliminated once the Doppler shift, the radio coverage environment is deemed no more high-speed train P Doppler shift of radio coverage environment.

[0078] 如前所述,移动直放站,包括选频直放站、移频直放站及宽频直放站等,采用本发明的无多普勒频移中继装置实现。 [0078] As described above, a mobile repeater, comprising a frequency selective repeater, repeater and broadband frequency shifting repeater, etc., according to the present invention are not achieved Doppler shift relay device. 该中继装置用于实现信号中继,并且消除被中继的信号的多普勒频移,消除多普勒频移的关键在于跟踪多普勒频移因子,跟踪多普勒频移因子的过程通过一多普勒频移跟踪单元实现,有两种实现方案,其一是对中频域下行信号进行跟踪,称中频方案,另一则是对零中频域下行信号进行跟踪,称零中频方案。 Means for implementing the relay relaying signals, and the signal relayed to eliminate the Doppler frequency shift, to eliminate the Doppler shift that the key tracking the Doppler shift factor, tracking Doppler shift factor by a process of tracking the Doppler shift unit realizes, there are two implementations, one is the downlink frequency domain signals to track, said iF method, the other is the zero frequency domain to track the downlink signal, said zero-iF method . 本发明中,两种方案分别以第一和第二实施例进行具体说明。 In the present invention, two solutions, respectively the first and second embodiments will be specifically described.

[0079] 以下以图2和图3共同揭示本发明的采用中频方案的第一实施例。 [0079] In the following FIGS. 2 and 3 together disclosed embodiment employs a first embodiment of the present invention is the intermediate frequency.

[0080] 本发明第一实施例的无多普勒频移中继装置由施主天线201,受主天线202,双工器211、212,放大器221、222、223、224、225、226、227、228,混频器231、232、233、234,中频带通滤波器241、242,倍频器251、252、253、254,基准频率源261,多普勒频移跟踪单元271, 以及耦合器281构成。 [0080] None of the first embodiment of the Doppler frequency shift of the present invention, the relay apparatus by the donor antenna 201, a main receiving antenna 202, a duplexer 211, 212, 221,222,223,224,225,226,227 amplifier , 228, 231,232,233,234 mixer, band-pass filters 241, 242, 251,252, 253,254 multiplier, the reference frequency source 261, tracking the Doppler shift unit 271, and a coupling 281 constitution. 其中,放大器221、混频器231、放大器222构成移动直放站的下行下变频通道;放大器225、混频器233、放大器226构成移动直放站的下行上变频通道。 Wherein, amplifier 221, a mixer 231, an amplifier 222 constituting the downlink channel frequency of the mobile repeater; an amplifier 225, a mixer 233, an amplifier 226 constituting the downlink channel frequency of the mobile repeater. 下行下变频通道、中频带通滤波器241、下行上变频通道一起构成移动直放站的下行链路。 Downlink channel downconversion, band-pass filter 241, the downlink frequency together comprise the downlink channels of the mobile repeater. 放大器228、混频器234、放大器227构成移动直放站的上行下变频通道;放大器224、混频器232、放大器223构成移动直放站的上行上变频通道。 Amplifier 228, a mixer 234, an amplifier 227 constituting the uplink frequency channel of the mobile repeater; amplifier 224, a mixer 232, an amplifier 223 constituting the uplink frequency channel of the mobile repeater. 上行下变频通道、中频带通滤波器242、上行上变频通道一起构成移动直放站的上行链路。 Uplink channel downconversion, band-pass filter 242, up-conversion on the uplink channel together form the mobile repeater. 耦合器281、多普勒频移跟踪单元271、基准频率源261、倍频器251、252、253、254构成移动直放站的频率合成器,简称频合器。 Coupler 281, tracking the Doppler shift unit 271, a reference frequency source 261, 251,252, 253,254 multiplier constituting the mobile repeater frequency synthesizer, referred to as frequency coupler. 其中,多普勒频移跟踪单元271具有多普勒频移跟踪能力,为下行下变频通道和上行上变频通道提供本振频率源;而基准频率源261由高稳定度的晶体振荡器(例如稳定度优于士0. Olppm的恒温晶振TCX0)来担任,为下行上变频通道和上行下变频通道提供本振频率源。 Wherein the tracking the Doppler shift unit 271 having Doppler shift tracking capability for the local frequency source to provide a downlink frequency channel and an uplink channel on frequency; the reference frequency source 261 by a crystal oscillator with high stability (e.g. Shi 0. Olppm stability better than the OCXO TCX0) to serve as, the channel frequency local frequency source is provided on the downlink and uplink frequency channel lower.

[0081] 来自基站或射频拉远单元的下行射频信号经施主天线201和双工器211之后送到下行下变频通道进行下变频。 [0081] The downlink radio frequency signal from the base station or radio remote unit down-converted by the downconversion to the channel after the donor antenna 211 and the duplexer 201. 下变频采用低本振下边带方案,得到的下行中频信号经中频带通滤波器241之后送到下行上变频通道进行上变频。 A low frequency local oscillator at the lower sideband embodiment, downlink intermediate frequency signal obtained by up-converted to the downconversion channel after band-pass filters 241. 上变频使用低本振上边带方案,得到的下行射频信号经双工器212和受主天线202发送给车厢内的移动台。 A low frequency oscillator on the upper belt of the present embodiment, a downlink radio frequency signal obtained through duplexer 212 and transmitted to the mobile station in the compartment 202 receiving main antenna.

[0082] 来自车厢内移动台的上行射频信号经受主天线202和双工器212之后送到上行下变频通道进行下变频,下变频采用低本振下边带方案,得到的上行中频信号经中频带通滤波器242之后送到上行上变频通道进行上变频。 [0082] The uplink RF signals from the mobile stations subjected to the vehicle interior to the primary antenna frequency downconverts the uplink channel after 212,202 and a duplexer, a low frequency local oscillator at the lower sideband embodiment, the uplink IF signals obtained in the frequency band pass filter to the uplink channel is upconverted after 242 upconverts. 上变频采用低本振上边带方案,得到的上行射频信号经双工器211和施主天线201之后发送给基站或射频拉远单元。 A low frequency oscillator on the upper belt of the present embodiment, after the transmission 201 to the upstream RF signal obtained through the antenna duplexer 211 and a donor base station or a radio remote unit.

[0083] 本实施例的多普勒频移跟踪单元271采用本地基准频率源261产生的信号直接作为内部自动频率校正单元的参考信号,其原理框图如图3所示。 [0083] The present embodiment the Doppler frequency shift signal tracking unit 271 uses the local reference frequency source 261 generates a reference signal directly as an internal automatic frequency correction unit and its block diagram shown in Figure 3. 多普勒频移跟踪单元271由放大器421、422、混频器431、432、中频带通滤波器441、442、自动频率校正(AFC)单元(下称校正单元)471、使用压控晶体振荡器(VCXO)充当的受控频率源461、倍频器451、452、453 构成。 Tracking Doppler shift unit 271 oscillator amplifier 421 and 422, mixers 431 and 432, band-pass filters 441 and 442, automatic frequency correction (AFC) unit (hereinafter referred to as correcting means) 471, a voltage controlled crystal device (VCXO) 461 serving as the controlled frequency source, a frequency multiplier configured 451,452,453. 需要注意的是,其中的放大器421,422与混频器431构成了下变频通道,耦合器281 与该下变频通道以及该中频带通滤波器441可以将射频域的下行信号进行下变频至中频域,从而提供给所述校正单元471使用。 Note that, where the amplifiers 421, 422 and the mixer 431 downconverts the channel configuration, the coupler 441 may be a downlink signal 281 and the radio frequency domain channel frequency and the lower band-pass filters downconverted to an intermediate frequency domain, thereby providing said correction unit 471 to use. 所述倍频器453、混频器432及滤波器442则共同构成了变换单元,用于变换信号中的多普勒频移因子的方向。 The frequency multiplier 453, a mixer 432 and a filter 442 together constitute the conversion unit, for converting signals in the direction of Doppler shift factor.

[0084] 多普勒频移跟踪单元271有两个输入信号和两个输出信号。 [0084] Doppler shift tracking unit 271 has two input signals and two output signals. 两个输入信号分别是从下行链路射频前端通过耦合器281耦合得到的含有下行导频信号的下行射频信号和由基准频率源261提供的频率为f;的基准频率信号;两个输出信号分别是能够跟踪下行正向多普勒频移的频率为f'。 Two signals are input from the downlink through a downlink RF front-end radio frequency signal comprising a downlink pilot signal coupler and the coupler 281 to obtain a reference frequency provided by frequency source 261 is F; a reference frequency signal; two output signals are It is able to track the Doppler shift forward the downlink frequency f '. 的下行跟踪信号和预置了上行反向多普勒频移的频率为f" J勺上行跟踪信号,上行跟踪信号与下行跟踪信号均源自于该受控频率源461,其中上行跟踪信号为原始跟踪信号经变换单元变换后的信号。 Downlink tracking signal and the preset reverse uplink Doppler shift frequency f "J scoop up the tracking signal, the uplink and the downlink tracking signal tracking signal are derived from the controlled frequency source 461, wherein the uplink signal is a tracking original signal tracking signal transform unit.

[0085] 在多普勒频移跟踪单元271中,受控频率源(压控晶体振荡器)461受校正单元471控制输出的信号是下行跟踪信号,其频率f'。 [0085] Doppler shift tracking unit 271, the controlled frequency source (voltage controlled crystal oscillator) 461 outputs a control signal correction unit 471 is receiving the downlink tracking signal, the frequency f '. 受自动频率校正单元471产生的控制信号的控制。 Controlled by the control signal of the automatic frequency correction unit 471 is generated. 自动频率校正单元471的一路输入信号为下行导频信号与受控频率源(压控晶体振荡器)461输出的信号的倍频信号混频、滤波后得到的中频导频信号;自动频率校正单元471的另一路输入信号即参考信号为基准频率源信号的倍频信号。 An automatic frequency mixing frequency signal along the input signal correction unit 471 outputs the downlink pilot signal controlled frequency source (voltage controlled crystal oscillator) signal 461, the IF filter after conducting a pilot signal; automatic frequency correction unit another channel 471 that is an input signal the reference signal is multiplied signal of the reference frequency signal source. 自动频率校正单元471的功能就是检测下行导频信号的存在,并在下行导频信号存在的情况下,计算下行导频信号(经过变频)与本地基准频率信号(经过倍频)之间的频率误差函数,产生相应的控制信号调节受控频率源(压控晶体振荡器)461的输出频率,维持上述频率误差为零。 Frequency between automatic frequency correction unit 471 is the function of detecting the presence of a downlink pilot signal, and in the case of a downlink pilot signal, and calculates a downlink pilot signal (after conversion) and the local reference frequency signal (through frequency) error function, generating an output control signal corresponding to the frequency adjustment controlled frequency source (voltage controlled crystal oscillator) 461, maintaining of the frequency error is zero.

[0086] 在变换单元中,下行跟踪信号再与本地基准频率源信号的2倍频信号进行混频, 取后者与前者的差频信号滤波后得到频率为f"。= 2&-广。的上行跟踪信号。 [0086] In the transform unit, a downlink signal is then mixed with the tracking frequency signal 2 local reference frequency source signal, taking the difference between the former and the latter to obtain the pilot signal filtering frequency of f "= 2 & -.. Wide an uplink tracking signal.

[0087] 结合图2和图3,设下行射频信号载波的标准频率为fd,上行射频信号载波的标准频率为fu,下行导频信号的标准频率为fp,下行中频信号载波的标准频率为fid,上行中频信号载波的标准频率为fiu,下行中频导频信号的标准频率为fip。 [0087] in conjunction with FIGS. 2 and 3, is provided downstream the standard frequency of the RF signal carrier is fd, the standard frequency of the upstream RF signal carriers to FU, the standard frequency of the downlink pilot signal is FP, the standard frequency of the downlink IF signal carrier is fid , standard frequency uplink IF signal carrier is FIU, standard intermediate frequency of a downlink pilot signal is fip. 令X = fd/fo; y = fu/f0, ζ =fp/f。 So that X = fd / fo; y = fu / f0, ζ = fp / f. ,w = fid/fd = fiu/fu = fip/fpD 取倍频器251,253 的倍频因子为d = d' = x(lw), 倍频器252、254的倍频因子为u = u' = y (l_w),倍频器451的倍频因子为ρ = ζ (l_w),倍频器452的倍频因子为q = zw,倍频器453的倍频因子为2。 , W = fid / fd = fiu / fu = fip / fpD taken multiplier 251, 253 is the multiplication factor d = d '= x (lw), the multiplication factor multiplier 252 is u = u' = y (l_w), multiplier 451 is the multiplication factor ρ = ζ (l_w), multiplier 452 is the multiplication factor q = zw, multiplier 453 is the multiplication factor 2.

[0088] 移动直放站收到的下行导频信号的频率为fp+Afp,其中Afp为其多普勒频移。 Frequency downlink pilot [0088] Repeater mobile received pilot signal is fp + Afp, where Afp for Doppler shift. 该信号与频率为f'。 The signal of the frequency f '. 的下行跟踪信号的倍频信号Pf' ^混频、滤波后得到频率为f' ip = fρ+Afp-Pf'。 A downlink signal frequency tracking signal Pf '^ mixed, filtered to give a frequency f' ip = fρ + Afp-Pf '. 的中频导频信号。 IF pilot signal. 自动频率校正单元471计算中频导频信号与频率为fip =Qf0的基准频率源信号的倍频信号之间的频率误差函数,并依此控制受控频率源461,以维持频率误差为零,即f ' ip"fip = 0。因此,当自动频率校正单元471进入跟踪状态时,有Pf' ο = fp+Afp-fip0 此时,下行跟踪信号的频率为f' 0 = (fp+Afp-fip)/P = f0(l+A/ (1-w)),而上行跟踪信号的频率为f〃 ο = 2f0"f ' 0 = f0(lA/(lw))o由此可见在下行跟踪信号的频率f'。 Automatic frequency correction unit 471 calculates an intermediate frequency pilot signal frequency fip = error function between a frequency-multiplied signal of the reference frequency source Qf0 signal and controlling the controlled frequency source 461 so as to maintain the frequency error is zero, i.e., f 'ip "fip = 0. Thus, when the automatic frequency correction unit 471 to enter the tracking state, there Pf' ο = fp + Afp-fip0 in this case, tracking the frequency of a downlink signal is f '0 = (fp + Afp-fip ) / P = f0 (l + a / (1-w)), and the frequency of the tracking signal is an uplink f〃 ο = 2f0 "f '0 = f0 (lA / (lw)) o shows a tracking signal in the downlink frequency f '. 中含有下行多普勒频移因子+△,而在上行跟踪信号的频率f"。中含有上行反向多普勒频移因子-Δ。 Contained in the downlink Doppler shift factor + △, contained the reverse uplink Doppler shift factor at frequency f -Δ tracking uplink signal. "In.

[0089] 在下行链路中,将下行跟踪信号经过d倍频后得到频率为df ' ^ = fd+ Δ fd-fid的本振信号用于下行下变频通道;将基准频率源信号经过d'倍频后得到的频率为d' f0 = fd_fid的本振信号用于下行上变频通道。 [0089] In the downlink, the downlink tracking signal obtained after the frequency multiplier d df 'at ^ = fd + Δ fd-fid local oscillator frequency signal for the downlink channel; a reference frequency signal source through d' times after the frequency is obtained by frequency-d 'of the local signal f0 = fd_fid upconversion for the downlink channel. 而在上行链路中,将基准频率源信号经过u'倍频后得到频率为u' f0 = fu-fiu的本振信号用于上行下变频通道;将上行跟踪信号经过u倍频后得到频率为uf"。= fu- Δ fu-fiu的本振信号用于上行上变频通道。 In the uplink, the reference frequency signal passing u 'obtained after frequency multiplication u' local oscillation signal f0 = fu-fiu frequency channel for the uplink; uplink frequency tracking signal obtained after the frequency u is uf ". = fu- Δ fu-fiu local oscillator signal for up-conversion on the channel.

[0090] 对于下行方向而言,由基站或射频拉远单元发送到移动直放站的是载波标准频率为fd的下行射频信号。 [0090] For the downlink direction, the base station or radio remote unit is transmitted to the mobile repeater downlink carrier frequency standard of a radio frequency signal fd. 由于列车的高速移动,到达移动直放站的下行射频信号载波频率为fd+Afd,其中Afd是引入的多普勒频移。 Since the high-speed movement of the train, reaches a downlink carrier frequency of the RF signal repeater for mobile fd + Afd, wherein Afd Doppler shift is introduced. 下行射频信号经本振信号频率为fd+Afd-fid的下行下变频通道变成载波频率为fid的下行中频信号,再经本振信号频率为fd_fid的下行上变频通道变成载波频率为fd的下行射频信号,发送给车厢内的移动台。 A downlink RF signals via the LO signal frequency fd + Afd-fid downconversion downlink channel into a downlink carrier frequency fid intermediate frequency signal, and then the frequency of the local signal on the downlink frequency channel into fd_fid carrier frequency fd is a downlink RF signals, to the mobile station in the vehicle cabin. 由于列车上移动直放站与车厢内移动台的相对移动速率可以忽略不计,因此移动台收到的将是无多普勒频移的标准下行射频信号。 Since the movement of the train compartment repeater station moves within the relative rate of motion is negligible, and therefore the mobile station receives will be no Doppler shift standard downlink RF signals.

[0091] 反之对于上行方向而言,车厢内移动台发送到列车上移动直放站的是载波标准频率为fu的上行射频信号。 [0091] For the upstream direction and vice versa, the mobile station transmits to the mobile vehicle interior repeater standard train is the carrier frequency fu of an uplink radio frequency signal. 由于列车上移动直放站与车厢内移动台的相对移动速率可以忽略不计,因此移动直放站收到的上行射频信号的载波频率仍为fu。 Since the movement of the train compartment repeater station moves within the relative rate of motion is negligible, and therefore the carrier frequency of the upstream radio frequency signal received by the mobile repeater remains fu. 上行射频信号经本振信号频率为fu_fiu的上行下变频通道变成载波频率为fiu的上行中频信号,再经本振信号频率为fu" Δ fu-fiu的上行上变频通道变成载波频率为fu_ Δ fu的上行射频信号,发送给基站或射频拉远单元。由于移动直放站在上行射频信号中预置了一个反向的多普勒频移_Afu,与列车 Upstream RF signal by the local oscillation signal frequency is fu_fiu uplink frequency channel for the carrier frequency becomes fiu uplink IF signal, and then the frequency of the local oscillation signal on an uplink fu "Δ fu-fiu frequency conversion into a carrier frequency of the channel fu_ Δ fu uplink RF signals, to the base station or radio remote unit. Since the mobile repeater preset uplink RF signals in a reverse Doppler shift _Afu, the train

11高速移动引起的多普勒频移Afu相抵消,因此到达基站或射频拉远单元的将是没有多普勒频移的标准上行射频信号。 11 the Doppler frequency shift caused by the high-speed movement Afu cancel, thus reach the base station or radio remote unit will be no Doppler shift of the upstream RF signal standard.

[0092] 请继续参阅图4和图5,其共同揭示本发明的第二实施例,该实施例与前一实施例的主要不同之处通过图与图之间的对比可以明显得出,在于:首先,本实施例的中继装置工作在零中频域而非中频域;其次,本实施例的自动频率校正单元571的参考信号来源自受控频率源561的反馈信号(下行跟踪信号)而非本地基准频率源信号;再者,由前述两处区别引起的多普勒频移跟踪单元内部的信号处理变化。 [0092] Please refer to FIGS. 4 and 5, which collectively disclosed in the second embodiment of the present invention, this embodiment is different from the primary embodiment of the previous embodiments can be made apparent from comparison between FIGS by FIG, wherein : first, the relay device of the operation of this embodiment in frequency domain rather than the zero frequency domain; secondly, the reference signal source automatic frequency correction unit 571 of the present embodiment is controlled from a feedback signal (tracking signal downlink) frequency source 561 and non-local reference frequency source signal; Furthermore, due to the Doppler frequency shift difference between the two signal processing units inside the track changes.

[0093] 为助于理解采用中频方案的第一实施例和采用零中频方案的第二实施例的详细区别,如下结合图4和图5对第二实施例做进一步揭示。 [0093] To facilitate understanding of the IF method using the first embodiment and second embodiment differs in detail using the zero-IF scheme below in conjunction with FIGS. 4 and 5 further disclosed a second embodiment.

[0094] 本发明第二实施例的无多普勒频移中继装置由施主天线301,受主天线302,双工器311、312,放大器321、322、323、324、325、326、327、328,混频器331、332、333、334,零中频低通滤波器341、342,倍频器351、352、353、354,基准频率源361,多普勒频移跟踪单元371, 以及耦合器381构成。 [0094] Doppler-free second embodiment of the present invention by the frequency shifting repeater donor antenna 301, a main receiving antenna 302, a duplexer 311, 312, 321,322,323,324,325,326,327 amplifier , 328, mixers 331,332,333,334, zero-IF low pass filter 341, 342, 351,352,353,354 multiplier, the reference frequency source 361, tracking the Doppler shift unit 371, and coupler 381 configured. 其中,放大器321、混频器331、放大器322构成移动直放站的下行下变频通道;放大器325、混频器333、放大器326构成移动直放站的下行上变频通道。 Wherein, the amplifier 321, a mixer 331, an amplifier 322 constituting the downlink channel frequency of the mobile repeater; an amplifier 325, a mixer 333, an amplifier 326 constituting the downlink channel frequency of the mobile repeater. 下行下变频通道、低通滤波器341、下行上变频通道一起构成移动直放站的下行链路。 Downlink channel downconverted, low-pass filter 341, the downlink frequency together comprise the downlink channels of the mobile repeater. 放大器328、 混频器334、放大器327构成移动直放站的上行下变频通道;放大器324、混频器332、放大器323构成移动直放站的上行上变频通道。 Amplifier 328, a mixer 334, an amplifier 327 constituting the uplink frequency channel of the mobile repeater; an amplifier 324, a mixer 332, an amplifier 323 constituting the uplink frequency channel of the mobile repeater. 上行下变频通道、零中频低通滤波器342、上行上变频通道一起构成移动直放站的上行链路。 Uplink channel downconversion, zero IF low pass filter 342, an uplink frequency channel together with the movement of the uplink repeater configuration. 耦合器381、多普勒频移跟踪单元371、基准频率源361、倍频器351、352、353、354构成移动直放站的频率合成器。 Coupler 381, tracking the Doppler shift unit 371, a reference frequency source 361, frequency multipliers 351,352,353,354 constituting the mobile repeater frequency synthesizer. 其中,多普勒频移跟踪单元371具有多普勒频移跟踪能力,为下行下变频通道和上行上变频通道提供本振频率源;而基准频率源361由高稳定度的晶体振荡器(例如稳定度优于士0. Olppm的恒温晶振TCX0)来担任,为下行上变频通道和上行下变频通道提供本振频率源。 Wherein the tracking the Doppler shift unit 371 has a tracking Doppler shift, provides the local oscillator frequency source of frequency channel and an uplink channel at a downlink frequency upconverts; the crystal oscillator reference frequency source 361 of a high degree of stability (e.g. Shi 0. Olppm stability better than the OCXO TCX0) to serve as, the channel frequency local frequency source is provided on the downlink and uplink frequency channel lower.

[0095] 来自基站或射频拉远单元的下行射频信号经施主天线301和双工器311之后送到下行下变频通道进行下变频,得到的下行零中频信号经零中频低通滤波器341之后送到下行上变频通道进行上变频,由此得到的下行射频信号经双工器312和受主天线302发送给车厢内的移动台。 [0095] The downlink radio frequency signal from the base station or radio remote unit is downconverted frequency channel via the downlink after a donor antenna 301 and the duplexer 311 to a downlink after transmitting the zero-IF signal obtained by the zero-IF low-pass filter 341 downlink channel to upconvert the frequency, whereby downlink RF signals obtained via the diplexer 312 and 302 to the mobile station by the main antenna in the vehicle cabin.

[0096] 来自车厢内移动台的上行射频信号经受主天线302和双工器312之后送到上行下变频通道进行下变频,由此得到的上行零中频信号经零中频低通滤波器342之后送到上行上变频通道进行上变频,得到的上行射频信号经双工器311和施主天线301之后发送给基站或射频拉远单元。 [0096] upstream RF signals from the mobile stations subjected to the vehicle interior to the primary antenna frequency downconverts uplink channel after the diplexer 312 302 and, after transmitting the uplink signal by the zero-IF zero-IF low-pass filter 342 thus obtained up to upconvert the frequency channel, to the base station 311 and the donor antenna 301, after obtained the upstream RF signal duplexer or radio remote unit.

[0097] 本实施例的多普勒频移跟踪单元371采用受控频率源(压控晶体振荡器)561产生的反馈信号即下行跟踪信号作为内部的自动频率校正单元571的参考信号,其原理框图如图5所示。 [0097] The present embodiment the Doppler frequency shift using the tracking unit 371 controlled frequency source (voltage controlled crystal oscillator) 561 to produce a feedback signal as a tracking signal, i.e., a downlink reference signal inside the automatic frequency correction unit 571, the principle block diagram shown in Figure 5. 多普勒频移单元371由放大器521、522、混频器531、532、中频带通滤波器541、 542、自动频率校正(AFC)单元571、使用压控晶体振荡器(VCXO)充当的受控频率源561、倍频器551、552、553构成。 Doppler shift unit 371 by the 521, 522, mixers 531, 532, band-pass filters 541, 542, automatic frequency correction (AFC) unit 571, using a voltage controlled crystal oscillator (VCXO) acts as a receiving amplifier controlled frequency source 561, frequency multiplier 551,552,553 configuration. 需要注意的是,其中的放大器521,522与混频器531构成了下变频通道,耦合器381与该下变频通道以及该低通滤波器541可以将射频域的下行信号进行下变频至零中频域,从而提供给所述校正单元571使用。 Note that, where the amplifiers 521, 522 and the mixer 531 downconverts the channel configuration, the coupler 381 may be a radio frequency downlink signal domain downconverting the downconverted channel and the low-pass filter 541 to zero-IF domain, thereby providing said correction unit 571 to use. 所述倍频器553、混频器532及滤波器542则共同构成了变换单元,用于变换信号中的多普勒频移因子的方向。 The frequency multiplier 553, a mixer 532 and a filter 542 together constitute the conversion unit, for converting signals in the direction of Doppler shift factor.

[0098] 多普勒频移跟踪单元371有两个输入信号和两个输出信号。 [0098] Doppler shift tracking unit 371 has two input signals and two output signals. 两个输入信号分别是从下行链路射频前端通过耦合器381耦合得到的含有下行导频信号的下行射频信号和由基准频率源361提供的频率为f;的基准频率信号;两个输出信号分别是能够跟踪下行正向多普勒频移的频率为f/的下行跟踪信号和预置了上行反向多普勒频移的频率为f/的上行跟踪信号。 Two signals are input from the downlink through a downlink RF front-end radio frequency signal comprising a downlink pilot signal coupler and the coupler 381 to obtain a reference frequency provided by frequency source 361 F; a reference frequency signal; two output signals are It is able to track the tracking signal of the forward downlink downlink Doppler shift frequency of f / and preset reverse uplink signal tracking uplink Doppler shift frequency f / a.

[0099] 在多普勒频移跟踪单元371中,受控频率源(压控晶体振荡器)561受校正单元571的控制输出的信号是下行跟踪信号,其频率f/受自动频率校正单元571产生的控制信号的控制。 [0099] Doppler shift tracking unit 371, the controlled frequency source (voltage controlled crystal oscillator) control signal 561 output from the correction unit 571 is receiving the downlink tracking signal, the frequency f / automatic frequency correction unit 571 by control signal generated. 自动频率校正单元571的一路输入信号为下行导频信号与受控频率源(压控晶体振荡器)561输出的信号的倍频信号混频、滤波后得到的中频导频信号。 Frequency mixing signal signal automatic frequency correction unit 571 as one input signal and an output signal of a downlink pilot controlled frequency source (voltage controlled crystal oscillator) 561, an intermediate frequency filter after the pilot signal frequency. 自动频率校正单元571的另一路输入信号即参考信号为受控频率源561反馈信号即下行跟踪信号的倍频信号。 Automatic frequency correction unit 571 to another input signal, i.e. the reference signal is controlled frequency source 561 i.e., a feedback signal of the downlink signal frequency tracking. 自动频率校正单元571的功能就是检测下行导频信号的存在,并在下行导频信号存在的情况下,计算下行导频信号(经过变频)与该反馈信号(经过倍频)之间的频率误差函数,产生相应的控制信号调节受控频率源(压控晶体振荡器)的频率,维持上述频率误差为零。 A frequency error between the automatic frequency correction unit 571 is the function of detecting the presence of a downlink pilot signal, and in the case of a downlink pilot signal, and calculates a downlink pilot signal (after conversion) to the feedback signal (through frequency) function generating a corresponding control signal adjusting the frequency controlled frequency source (voltage controlled crystal oscillator), maintenance of the frequency error is zero.

[0100] 在变换单元中,下行跟踪信号再与本地基准频率源信号的2倍频信号进行混频, 取后者与前者的差频信号滤波后得到频率为fo = 2f0-f0'的上行跟踪信号。 [0100] In the transform unit, a downlink signal is then mixed with the track 2 the local frequency signal of a reference frequency source signal, taking the difference between the former and the latter to give a frequency of fo = 2f0-f0 'after the uplink pilot signal tracking filter signal.

[0101] 结合图4和图5,设下行射频信号载波的标准频率为fd,上行射频信号载波的标准频率为fu,下行导频信号的标准频率为fp,下行中频导频信号的标准频率为fi,令X = fd/ f。 [0101] in conjunction with FIGS. 4 and 5, the standard frequency of the downlink radio frequency signal carrier is fd, the standard frequency of the upstream RF signal carriers to FU, the standard frequency of the downlink pilot signal is FP, the standard frequency downlink intermediate frequency pilot signal is fi, so that X = fd / f. ,y = fu/f0' ζ = fp/f0, ν = fi/f。 , Y = fu / f0 'ζ = fp / f0, ν = fi / f. . 取倍频器351、353 的倍频因子为d = d' = X,倍频器352,354的倍频因子为u = u'= y,倍频器551的倍频因子为ρ = ζ_ν,倍频器552的倍频因子为q = v,倍频器553的倍频因子为2。 Take multiplier 351, 353 is the multiplication factor d = d '= X, multiplier 352, the multiplication factor of u = u' = y, multiplier 551 for multiplication factor ρ = ζ_ν, multiplier 552 multiplier factor q = v, the frequency multiplier 553 is the multiplication factor 2.

[0102] 移动直放站收到的下行导频信号的频率为fp+Afp,其中Afp为其多普勒频移。 Frequency downlink pilot [0102] Repeater mobile received pilot signal is fp + Afp, where Afp for Doppler shift. 该信号与频率为f/的下行跟踪信号的倍频信号Pf' ^混频、滤波后得到频率为fV = fp+Afp-pf0'的中频导频信号。 Pf downlink signal frequency tracking signal and the signal frequency f / a 'mixed ^, filtered to give a frequency of fV = fp + Afp-pf0' intermediate guide pilot signal. 自动频率校正单元571计算中频导频信号与频率为qfV的受控频率源反馈信号的倍频信号之间的频率误差函数,并依此调节压控晶体振荡器561,以维持频率误差为零,即qfc/ "f/ =0。因此,当自动频率校正单元571进入跟踪状态时,有fp+Afp-pf0' =qf0'。此时,下行跟踪信号的频率为fQ' = (fp+Afp)/(P+q) = f0(l+A), 而上行跟踪信号的频率为f/ = 2f0-f0' =f0(lA)o由此可见在下行跟踪信号的频率f0'中含有下行正向多普勒频移因子+△,而在上行跟踪信号的频率f/中含有上行反向多普勒频移因子-Δ。 Automatic frequency correction unit 571 calculates an intermediate frequency pilot signal frequency is a function of the frequency error between the frequency of the frequency controlled signal source qfV the feedback signal, and adjusting the voltage controlled crystal oscillator 561 so as to maintain the frequency error is zero, i.e. qfc / "f / = 0. Thus, when the automatic frequency correction unit 571 to enter the tracking state, there fp + Afp-pf0 '= qf0'. At this time, the tracking signal is the downlink frequency fQ '= (fp + Afp) / (P + q) = f0 (l + a), while tracking the frequency of an uplink signal is f / = 2f0-f0 '= f0 (lA) o shows the frequency f0 to track the downlink signal' contained in the forward downlink Doppler shift factor + △, contained the reverse uplink Doppler shift factor at frequency f -Δ uplink signal tracking / in.

[0103] 在下行链路中,将下行跟踪信号经过d倍频后得到频率为Clftl ' = fd+Afd的本振信号用于下行下变频通道;将基准频率源信号经过d'倍频后得到的频率为Clftl ' =fd的本振信号用于下行上变频通道。 [0103] In the downlink, the downlink tracking signal obtained after the frequency multiplier d Clftl '= fd + at the local signal for downconversion Afd channel; reference frequency signal source through d' after the multiplication to obtain frequency of Clftl '= fd local oscillation signal for frequency conversion on the downlink channel. 而在上行通道中,将基准频率源信号经过u'倍频后得到频率为u' f0 = fu的本振信号用于上行下变频通道;将上行跟踪信号经过u倍频后得到频率为Uf0" = fu_ Afu的本振信号用于上行上变频通道。 In the upstream channel, the reference frequency signal passing u 'obtained after frequency multiplication u' f0 = fu local oscillation signal for the uplink frequency channel; uplink frequency tracking signal obtained after the frequency u Uf0 " = fu_ Afu local oscillator signal for up-conversion on the channel.

[0104] 对于下行方向而言,由基站或射频拉远单元发送到移动直放站的是载波标准频率为fd的下行射频信号。 [0104] For the downlink direction, the base station or radio remote unit is transmitted to the mobile repeater downlink carrier frequency standard of a radio frequency signal fd. 由于列车的高速移动,到达移动直放站的下行射频信号载波频率为fd+Afd,其中Afd是引入的多普勒频移。 Since the high-speed movement of the train, reaches a downlink carrier frequency of the RF signal repeater for mobile fd + Afd, wherein Afd Doppler shift is introduced. 下行射频信号经本振信号频率为fd+Afd的下行下变频通道变成下行零中频信号,再经本振信号频率为fd的下行上变频通道变成载波频率为fd的下行射频信号,发送给车厢内的移动台。 A downlink RF signal frequency of the frequency conversion local signal into the downlink channel at a downlink zero-IF signal fd + Afd, and then by the frequency of the local oscillator signal frequency fd of the downlink channel carrier frequency fd becomes a downlink RF signals, transmitted to the mobile station in the cabin. 由于列车上移动直放站与车厢内移动台的 Since the mobile repeater on the train and moving the cabin units

13相对移动速率可以忽略不计,因此移动台收到的将是无多普勒频移的标准下行射频信号。 The rate of relative movement 13 is negligible, and therefore the mobile station receives the Doppler shift will be no standard downlink RF signals.

[0105] 反之对于上行方向而言,车厢内移动台发送到列车上移动直放站的是载波标准频率为fu的上行射频信号。 [0105] For the upstream direction and vice versa, the mobile station transmits to the mobile vehicle interior repeater standard train is the carrier frequency fu of an uplink radio frequency signal. 由于列车上移动直放站与车厢内移动台的相对移动速率可以忽略不计,因此移动直放站收到的上行射频信号的载波频率仍为fu。 Since the movement of the train compartment repeater station moves within the relative rate of motion is negligible, and therefore the carrier frequency of the upstream radio frequency signal received by the mobile repeater remains fu. 上行射频信号经本振信号频率为fu的上行下变频通道变成上行零中频信号,再经本振信号频率为fu-Afu的上行上变频通道变成载波频率为fu_ Δ fu的上行射频信号,发送给基站或射频拉远单元。 Upstream RF signal by the local oscillator signal frequency fu of an uplink channel is made up downconversion to zero IF signal, and then the frequency of the local oscillator signal fu-Afu uplink frequency channel into an uplink RF carrier frequency of the signal fu_ Δ fu, to the base station or radio remote unit. 由于移动直放站在上行射频信号中预置了一个反向的多普勒频移-△&,与列车高速移动引起的多普勒频移相抵消,因此到达基站或射频拉远单元的将是没有多普勒频移的标准上行射频信号。 Since the mobile repeater a preset reverse uplink Doppler shift in the radio frequency signal - △ &, and high-speed train movement causes Doppler shift offset, and therefore reach the base station or the remote radio unit Doppler shift is no standard upstream RF signal.

[0106] 由上述两个实施例可以看出,本发明的无多普勒频移中继装置(移动直放站)与传统的固定直放站的根本区别在于在直放站中引入了具有多普勒频移跟踪能力的多普勒频移跟踪单元271或371。 [0106] As can be seen from the above two embodiments, the present invention is no Doppler frequency shift relay device (mobile repeater) and traditional fixed repeater having a fundamental difference is introduced in the repeater Doppler shift tracking the Doppler shift of the tracking unit 271 or 371. 如果将多普勒频移跟踪单元271或371用基准频率源代替,那么移动直放站就与传统的固定直放站完全相同。 If the Doppler shift tracking unit 271 or 371 in place of the reference frequency source, the mobile repeater on is identical with the conventional fixed repeater.

[0107] 需要指出的是,对于包含多个频分载波的宽带直放站,因其只有一个宽带的上/ 下行通道,该上/下行通道的射频信号载波频率与各频分载波的频率不可能都相同,因此经过多普勒频移校正之后,在各频分载波中还可能会有剩余的多普勒频移,但剩余多普勒频移不超过ΔΒ/2,其中△是多普勒频移因子,B是宽带直放站的带宽。 [0107] It should be noted that for wideband repeater comprises a plurality of frequency division carriers, because only one wideband uplink / downlink channels, the up / downlink carrier frequency of the RF signal channels to each carrier frequency is not a frequency division may be the same, so after the Doppler frequency shift after correction at each carrier frequency-division may be further residual Doppler shift, Doppler shift but the remaining not more than ΔΒ / 2, where P is a multi-△ Doppler shift factor, B is the bandwidth of the broadband repeater. 对于包含多个频分载波的选频直放站,因其具有多个窄带的上/下行通道,每个上/下行通道都与一个频分载波相对应,因此经过多普勒频移校正之后,可以完全消除每个载波中的多普勒频移。 For frequency-division carriers comprising a plurality of frequency selective repeater, because the uplink / downlink channel having a plurality of narrow band, each uplink / downlink channel associated with a corresponding carrier frequency division, so after Doppler shift after correction , can completely eliminate the Doppler frequency shift of each carrier.

[0108] 以上两种实施例中的多普勒频移跟踪单元,既可以采用模拟电路来实现,也可以采用数字电路来实现。 Two kinds of [0108] the above embodiment Doppler shift tracking unit may be implemented using analog circuitry, digital circuitry can be implemented. 若采用数字电路来实现时,上述作为受控频率源使用的压控晶体振荡器(VCXO)应改为数字控制振荡器(NCO)。 If the digital circuit to achieve the controlled frequency source used as voltage-controlled crystal oscillator (VCXO) should be replaced by a numerically controlled oscillator (NCO). 若采用模拟电路来实现时,通常采用中频方案。 If implemented using analog circuitry, usually IF method. 对于模拟的选频直放站,通常还希望各通道在做限带滤波时的中频频率是相同的。 For the simulation of frequency-selective repeater, usually desirable when the intermediate frequency band-limiting filter is the same in each channel to do. 但是在上述的中频方案中,各个通道的中频频率并不相同。 However, in the above-described embodiment the intermediate frequency, the intermediate frequency is not the same for each channel. 这时可以在上述两种基本方案的基础上派生出两种统一中频方案,作为本发明的第三和第四实施例。 In this case, two universal IF can be derived on the basis of the above-described embodiment two basic aspect, as the third and fourth embodiments of the present invention.

[0109] 由上述第一实施例的中频方案派生的统一中频方案,作为本发明的第三实施例, 如图6所示。 [0109] Unified IF method derived by the first IF of the above embodiment, as a third embodiment of the present invention, as shown in FIG. 与图2所示中频方案相比,在下行上变频通道中增加了放大器625、二次混频器633、放大器626、统一中频滤波器641、以及倍频器653;而在上行上变频通道中增加了统一中频滤波器642、放大器628、二次混频器634、放大器627、以及倍频器654。 Compared with the embodiment shown in FIG. 2 IF, increases in the downstream channel frequency amplifier 625, second mixer 633, an amplifier 626, IF filter 641 uniform, and a multiplier 653; and on the upstream channel frequency IF filter 642 increases unified, the amplifier 628, second mixer 634, an amplifier 627, and a multiplier 654. 此时下行二次混频器将原来各不相同的下行中频混到统一的下行中频上再进行限带滤波;而上行二次混频器则将限带滤波后的上行统一中频混到不同的上行中频上再进行上变频。 At this time, the secondary mixer downstream respectively different original downlink IF band limiting filter then blended into a unified downlink intermediate frequency; and the second up mixer will limit the uplink band filtered IF mingled different unified and then up-converted IF uplink. 倍频因子d、 u与原中频方案中相同,而倍频因子d"、u〃、d'、u'则分别取XW-V、yW-V、xV、yV,其中V = fj/fo, fj为统一中频频率。 Multiplication factor d, the same as the original IF u embodiment, the multiplication factor d ", u〃, d ', u' are respectively taken XW-V, yW-V, xV, yV, where V = fj / fo, fj unified IF frequency.

[0110] 由上述第二实施例的零中频方案派生的统一零中频方案,作为本发明的第四实施例,如图7所示。 [0110] derived by the second embodiment of the zero IF scheme zero IF unified scheme, as a fourth embodiment of the present invention, as shown in FIG. 与图3所示零中频方案相比,增加了混频器735、736、本振信号滤波器743、 744、倍频器755,另外将原来的零中频低通滤波器341和342改为统一零中频滤波器741和742。 Compared with the zero IF scheme illustrated in FIG. 3, the mixers 735, 736 increases, the local oscillator signal filter 743, 744, multiplier 755, the original additional zero-IF and low-pass filters 341 to 342 EC ten 741 and IF filter 742. 此时下行下变频的本振信号改由下行跟踪信号经过d倍频后得到的信号与基准频率经过ν倍频后得到的信号混频得到;而上行上变频的本振信号则改由上行跟踪信号经过u 倍频后得到的信号与基准频率经过ν倍频后得到的信号混频得到。 Reference frequency signal frequency ν obtained after conversion of the local oscillation signal at this time to change the downlink from the downlink tracking signal obtained after the frequency mixer to obtain d; and the local oscillation signal frequency is changed upward by the upward tracking after the reference signal and the signal obtained after the frequency ν u octave frequency obtained after mixing obtained. 其中倍频因子ν = fi/fo,fi为统一零中频频率。 Wherein the multiplication factor ν = fi / fo, fi unified zero IF frequency.

[0111] 由上述实施例可见,在本发明的无多普勒频移中继装置中,自动频率校正单元是其核心。 [0111] seen from the above embodiments, the present invention is in no Doppler frequency shift in the relay apparatus, automatic frequency correction unit is the core. 在本发明的无多普勒频移中继装置中,除了跟踪校正频率的功能之外,在下行导频信号不是一直存在的情况下(例如GSM移动通信系统中下行导频信号是间歇发送的),自动频率校正单元还需要检测导频信号的存在。 In the present invention, no Doppler frequency shift in the relay apparatus, in addition to correction of the frequency tracking function outside, in case where the downlink pilot signal is not always present (e.g. GSM mobile communication system, a downlink pilot signals are transmitted intermittently ), automatic frequency correction unit further need to detect the presence of the pilot signal. 检测导频信号的算法可以参照本申请人在先申请专利《基于实信号的数字化自动频率检测方法》(专利公开号:CN101471727),而自动频率校正的算法可以参照本申请人在先申请专利《基于实频率参考信号的数字化自动频率校正方法》(专利公开号:CN101471726),当然也可以采用其它算法。 Algorithm for detecting the pilot signal can be referred to prior patent of the present applicant (Patent Publication Number: CN101471727) "digital automatic frequency detection method based on the real signal", and the automatic frequency correction algorithms can be referred to prior patent of the present applicant. " digital automatic frequency correction method of the real frequency of the reference signal "(Patent Publication number: CN101471726) based, of course, other algorithms may be used. 本领域普通技术人员在通读本发明之后即可知晓此一变通。 Those of ordinary skill in the art after its read through this invention to work.

[0112] 综上所述,本发明能有效地消除高速运动载体中的移动台与基站或射频拉远单元通信时的多普勒频移,起到保证通信质量的作用。 [0112] In summary, the present invention can effectively eliminate the high-speed movement of the carrier and the base station in a mobile station or a radio frequency Doppler shift of the remote unit communication time, functions to ensure the communication quality.

[0113] 上述实施例为本发明较佳的实施方式,但并不仅受上述实施例的限制。 [0113] The embodiments of the present preferred embodiment of the invention, but are not limited to the above embodiments. 例如在上述实施例的变频过程中可以采用不同的高、低本振和上、下边带方案,这时只要相应调整各倍频器的倍频因子就可以实现不同的变频方案;另外在上、下行通道中上、下变频单元的本振信号也可以互换。 For example, in the above-described conversion process embodiments may use different high and low LO and the lower sideband program, adjust the time as long as the corresponding multiplier multiplying factor of frequency conversion can be achieved in different programs; in addition, the downstream channel, the local oscillator signal downconversion unit may be interchanged. 因此其它任何在未背离本发明精神实质和原理下所作的改变、修饰、替代、组合、化简,均应视为本发明的等效置换方式,并包含在本发明的保护范围之内。 Thus any other changes in the spirit and principles of the invention made without departing from the, modifications, substitutions, combinations, simplification, shall be deemed equivalent substitution of the present invention, and are included within the scope of the present invention.

Claims (20)

  1. 一种多普勒频移跟踪单元,用于跟踪中继装置的因高速运动而引起的信号的多普勒频率偏移,其特征在于,该跟踪单元包括:耦合器,用于在中继装置下行链路的射频前端中耦合出一路下行信号;受控频率源,在校正单元的控制下产生包含下行正向多普勒频移因子的下行跟踪信号;下变频通道,以受控频率源产生的下行跟踪信号的频率为基准,将下行信号进行下变频;参考单元,用于产生一供校正单元参照的参考信号;校正单元,用于求取下变频后的下行信号所包含的下行导频信号与所述参考信号之间的频率误差函数,并调节受控频率源产生的下行跟踪信号的频率使该函数值维持为零;变换单元,将该下行跟踪信号变换为包含上行反向多普勒频移因子的上行跟踪信号。 One kind of Doppler shift tracking unit for tracking a signal relay apparatus due to high-speed movement caused by the Doppler frequency shift, characterized in that the tracking unit comprises: coupler means for relaying RF front-end coupled to a downlink signal all the way down; controlled frequency source to generate a downlink signal including downlink forward tracking the Doppler shift factor is under the control of the correction unit; downconversion channel, generating a controlled frequency source tracking the frequency of a downlink reference signal, the frequency of the downlink signal; reference cell for generating a reference signal for correcting a reference cell; a correcting unit for correcting the downlink pilot obtains a downlink signal contained in a frequency downconverted signal and the error function between the reference frequency signal, and adjusting the frequency of a downlink signal tracking controlled frequency source such that the generated function value is maintained at zero; transformation unit, is converted into the tracking signal comprises a downlink an uplink reverse Doppler an uplink tracking signal Doppler shift factor.
  2. 2.根据权利要求1所述的多普勒频移跟踪单元,其特征在于,所述参考单元包括倍频器和中继装置固有的基准频率源,基准频率源产生的信号经倍频器倍频后成为所述参考信号。 According to claim Doppler frequency shift of the track unit 1, characterized in that said reference unit comprises a unique reference frequency source frequency and the relay apparatus, the reference frequency signal generated by the source frequency doubler after becoming the reference signal frequency.
  3. 3.根据权利要求1所述的多普勒频移跟踪单元,其特征在于,所述参考单元包括倍频器和所述受控频率源,受控频率源产生的下行跟踪信号经倍频器倍频后成为所述参考信号。 According to claim Doppler frequency shift of the track unit 1, characterized in that said reference unit comprises a frequency multiplier and the controlled source, controlled frequency source generates a downlink tracking signal frequency multiplier after becoming the reference signal frequency.
  4. 4.根据权利要求1所述的多普勒频移跟踪单元,其特征在于,所述受控频率源为压控晶体振荡器(VCXO)或数字控制振荡器(NCO)。 According to claim Doppler frequency shift of the track unit 1, characterized in that said controlled frequency source is a voltage controlled crystal oscillator (VCXO) or a numerically controlled oscillator (NCO).
  5. 5.根据权利要求1所述的多普勒频移跟踪单元,其特征在于,所述受控频率源与下变频通道之间设有一倍频器对受控频率源产生的下行跟踪信号进行倍频运算。 According to claim Doppler frequency shift of the track unit 1, wherein the downlink tracking signal with a controlled frequency multiplier generating the controlled frequency source between the source and the downconverted frequency channel times frequency operation.
  6. 6.根据权利要求1至5中任意一项所述的多普勒频移跟踪单元,其特征在于,该跟踪单元还包括滤波器,其串接于下变频通道和校正单元之间,将下变频后的下行信号进行滤波后传输给所述校正单元。 According to claim 1 to 5 according to any one of Doppler shift tracking unit, characterized in that the tracking unit further comprises a filter which is connected in series between the frequency channels and a correction unit, lower after filtering the downlink transmission signal to said frequency correction unit.
  7. 7.根据权利要求1至5中任意一项所述的多普勒频移跟踪单元,其特征在于,所述变换单元包括:倍频器,用于对中继装置既有的基准频率源产生的信号进行预设倍数的倍频运算; 混频器,利用该倍频器的运算结果与下行跟踪信号进行混频从而产生所述上行跟踪信号;滤波器,用于对所述上行跟踪信号进行滤波后输出。 According to claim 1 to 5 according to any one of Doppler shift tracking unit, wherein said conversion unit comprises: a frequency multiplier for generating a reference frequency source of the existing relay device calculating a signal frequency of a predetermined multiple; mixer, using the calculation result of the multiplier downlink mixes to produce the tracking signal tracking the uplink signal; filter for the uplink signal for the tracking filtered output.
  8. 8. 一种无多普勒频移中继装置,用于实现信号中继并消除因高速运动而引起的信号的多普勒频率偏移,其包括下行链路和上行链路,其特征在于,该装置还包括:如权利要求1至7中任意一项所述的多普勒频移跟踪单元;下行链路中的下变频通道,以该跟踪单元输出的下行跟踪信号为本振对下行链路中的下行信号进行混频以消除下行信号中的正向多普勒频移;上行链路中的上变频通道,以该跟踪单元输出的上行跟踪信号为本振对上行链路中的上行信号进行混频以在上行信号中预置反向多普勒频移。 A non-Doppler shift relay means for relaying a signal to realize high-speed movement and the cancellation signal caused by the Doppler frequency shift, including uplink and downlink, wherein , the apparatus further comprising: as claimed in claims 1 to 7 according to any one of Doppler shift tracking unit; downconversion downlink channels to the downlink tracking unit tracking signal outputted from the downlink local oscillation the downlink signals mixes downstream signal to eliminate the Doppler shift in the forward direction; upconversion uplink channel, an uplink to the tracking unit tracking signal outputted from a local oscillation in uplink It mixes the uplink signal in the uplink signal at a preset reverse the Doppler shift.
  9. 9.根据权利要求8所述的无多普勒频移中继装置,其特征在于,该装置包括施主天线和受主天线,施主天线用于与基站或射频拉远单元无线电性连接,受主天线用于与移动台无线电性连接。 According to claim no Doppler frequency shift of said relay device 8, characterized in that the device comprises a donor antenna and a receiving main antenna, or the donor antenna with a base station for radio remote unit connected to a radio, acceptor an antenna for radio connection with the mobile station properties.
  10. 10.根据权利要求9所述的无多普勒频移中继装置,其特征在于,所述施主天线采用全向或定向天线,所述受主天线采用一体纵长的泄漏电缆。 Doppler-free according to claim 9, said frequency shifting repeater, characterized in that the donor antenna omnidirectional or directional antenna, the receiving antenna with integrated main longitudinal leaky cable.
  11. 11.根据权利要求8至10中任意一项所述的无多普勒频移中继装置,其特征在于,所述基准频率源采用稳定度优于士0. Olppm的晶体振荡器。 Doppler-free according to claims 8 to 10 in any one of frequency shift of the relay apparatus, wherein, using the reference frequency source stability better than 0. Olppm disabilities crystal oscillator.
  12. 12. 一种无多普勒频移中继方法,用于实现信号中继并消除信号中因高速运动而引起的多普勒频率偏移,其特征在于,其包括如下步骤:1)从下行链路射频前端中耦合出一路下行信号;2)产生一下行跟踪信号;3)以下行跟踪信号为基准将该射频下行信号下变频至中频或零中频域;4)求取该中频或零中频域下行信号所包含的下行导频信号与一个供参照的参考信号之间的频率误差函数,并调节步骤2)中产生下行跟踪信号的频率,以使该函数值维持为零;5)对于下行链路,以该下行跟踪信号为本振对下行信号进行混频以消除下行信号中的正向多普勒频移;6)对于上行链路,先将该下行跟踪信号变换为预置反向多普勒频移的上行跟踪信号, 再以该上行跟踪信号为本振对上行信号进行上变频,以在上行信号中预置反向的多普勒频移。 A non-Doppler shift relay method for relaying signals implement and eliminate the Doppler frequency offset due to the high-speed signal due to the movement, characterized in that it comprises the following steps: 1) from the downlink RF front-end coupled links in a way down signal; 2) to generate a downlink signal tracking; 3) the following reference will row to the tracking signal to an intermediate frequency or radio frequency domain zero-IF signal at a downlink; 4) obtaining the IF or zero-IF downlink pilot field of a downlink pilot signal included in the frequency error function between the signal and the reference signal for a reference, and the adjusting step 2) generated in a downlink frequency tracking signal, so that the function value is maintained at zero; 5) for the downlink link, to the downlink tracking signal of a local oscillation signal of the downlink mixing in the downlink signal to eliminate the Doppler shift forward; 6) for uplink, downlink tracking the first signal into a preset counter an uplink tracking Doppler shift signal, a tracking signal and then to the uplink signal on the uplink frequency of a local oscillation, in a preset reverse uplink signal Doppler shift.
  13. 13.根据权利要求12所述的无多普勒频移中继方法,其特征在于,所述步骤4)中的参考信号由一基准频率源产生的信号经倍频运算后获得。 Doppler-free according to claim 12, wherein the frequency shift relay method, wherein the signal frequency of the reference signal calculating step 4) is produced by a reference frequency source is obtained.
  14. 14.根据权利要求12所述的无多普勒频移中继方法,其特征在于,所述步骤4)中的参考信号由所述步骤2)的下行跟踪信号经倍频运算后获得。 Doppler-free according to claim 12, wherein the frequency shift relay method, wherein the reference signal in the step 4) is obtained after the step 2) of the downlink signal frequency tracking operation.
  15. 15.根据权利要求12所述的无多普勒频移中继方法,其特征在于,所述下行跟踪信号由一受控的压控晶体振荡器(VCXO)或数字控制振荡器(NCO)产生。 Doppler-free according to claim 12, wherein the frequency shift relay method, wherein the downlink tracking signal (VCXO) or numerically controlled oscillator (NCO) generated by a voltage controlled crystal oscillator controlled .
  16. 16.根据权利要求12所述的无多普勒频移中继方法,其特征在于,所述步骤3)中的下行跟踪信号已经过倍频运算。 Doppler-free according to claim 12, wherein the frequency shift relay method, wherein the downlink tracking signal in the step 3) has been in operation frequency.
  17. 17.根据权利要求12至16中任意一项所述的无多普勒频移中继方法,其特征在于,所述步骤4)中的中频域或零中频域下行信号已经过滤波。 Doppler-free 17.12 to 16 according to any one of claims frequency shift of the relay, characterized in that the frequency domain) or in the step 4 to zero down signal frequency domain wave has been filtered.
  18. 18.根据权利要求12至16中任意一项所述的无多普勒频移中继方法,其特征在于,步骤6)中,所述上行跟踪信号由所述下行跟踪信号与一基准频率源产生的信号的倍频运算结果混频后滤波而得。 Doppler-free according to claim 12 to 16 according to any one of frequency shift relay method, wherein step 6), the uplink signal in the downlink tracking by the tracking signal and a reference frequency source doubling calculation result produced after mixing signal obtained by filtering.
  19. 19. 一种高速列车无线覆盖系统,其特征在于:其采用如权利要求8至11中任意一项所述的无多普勒频移中继装置,其施主天线外置于高速列车顶部,其受主天线沿高速列车的车厢一体纵长布设。 19. A high-speed train radio coverage system, comprising: employing as claimed in any of claims 8 to 11 no one of the Doppler shift relay device, which external donor antenna placed on top of high-speed trains, which acceptor compartment antenna integrally along the longitudinal speed train layout.
  20. 20. 一种高速列车无线覆盖方案,适用于相对无线中继站高速移动的列车,其特征在于,其包括如下步骤:1)在高速列车上装设直放站,并设置该直放站在任意时刻只接收一个方向的基站或射频拉远单元信号,忽略其它方向的信号;2)为该直放站的下行链路提供能够跟踪正向多普勒频移的下行跟踪信号,为该直放站的上行链路提供预置了反向多普勒频移的上行跟踪信号。 20. A high-speed train radio coverage solutions, suitable for relatively high-speed movement of the radio relay station train, characterized in that it comprises the following steps: 1) the repeater is mounted on the high-speed train, and provided that at any time only repeater base station receiving a direction signal or radio remote unit, ignoring signals from other directions; 2) for the downlink repeater downlink provide a tracking signal tracks the positive Doppler frequency shift, for the repeater uplink tracking signal is provided with predetermined reverse uplink Doppler shift. 3)将下行跟踪信号用于该直放站下行链路的下变频通道和上变频通道中,消除因列车相对移动而在下行信号中引入的多普勒频移,以便列车内移动台接收到无多普勒频移的下行信号;4)将上行跟踪信号用于该直放站的上行链路的下变频通道和上变频通道中,在上行信号中预置反向的多普勒频移,以便无线中继站接收到无多普勒频移的上行信号。 3) tracking signal for the downlink channel of the repeater downconversion and upconversion downlink channels, due to relative movement of the train and eliminating the introduction of the downlink signal in the Doppler shift, so that the mobile station receives a train no Doppler shift of the downlink signal; and 4) tracking signal for the uplink channel uplink downconversion and upconversion of the repeater channel, preset in the reverse uplink signal Doppler shift to the radio relay station receives the uplink signal has no Doppler shift.
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