CN1870473B - Passive intermodulation testing method of mobile communication base station system - Google Patents

Passive intermodulation testing method of mobile communication base station system Download PDF

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CN1870473B
CN1870473B CN2005100310579A CN200510031057A CN1870473B CN 1870473 B CN1870473 B CN 1870473B CN 2005100310579 A CN2005100310579 A CN 2005100310579A CN 200510031057 A CN200510031057 A CN 200510031057A CN 1870473 B CN1870473 B CN 1870473B
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李挺钊
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Huawei Technologies Co Ltd
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Abstract

This invention relates to test to the passive intermodulation performance of the communication system, which controls an emitter to emit test signals according to a preset mode, controls a receiver to scan and receive the signals in the test bands and analyze spectrums of the received signals to evaluate the entire passive intermodulation performance of the base station, in which, the original outside interference signals are received at the shut-off state of the emitter to eliminate its influence and measure the performance accurately and the received test bands are computed accurately by the known carrier frequency sphere, intermodulation stages and the received frequency sphere parameters and the test signal receiving quality is increased by scanning the emitted and received continuous waves.

Description

移动通信基站系统无源互调性能测试方法 Test method for passive intermodulation performance of mobile communication base station system

技术领域technical field

本发明涉及通信系统无源互调性能测试,特别涉及移动通信基站系统的无源互调性能测试。The invention relates to the passive intermodulation performance test of a communication system, in particular to the passive intermodulation performance test of a mobile communication base station system.

背景技术Background technique

在无线通信中,各种系统噪声及外界干扰对于无线信号及通信质量的影响都很大。因此在无线通信系统设计与安装过程中,都需要对系统抗干扰等性能进行测试评价,甚至在运行维护过程中都要经常进行测试,以判断部件老化、环境影响等因素对系统性能劣化程度,从而采取相应措施进行维护,以达到保持无线通信系统服务质量的目的。可见系统性能评价与监测对通信系统正常运行是非常重要的,而无源互调性就是其中的一种典型的无线系统性能指标。In wireless communication, various system noises and external interference have a great impact on wireless signals and communication quality. Therefore, in the design and installation process of wireless communication systems, it is necessary to test and evaluate the anti-interference performance of the system, and even in the operation and maintenance process, it is necessary to carry out frequent tests to determine the degree of degradation of system performance due to factors such as component aging and environmental impact. Therefore, corresponding measures are taken for maintenance, so as to achieve the purpose of maintaining the service quality of the wireless communication system. It can be seen that system performance evaluation and monitoring are very important to the normal operation of communication systems, and passive intermodulation is one of the typical wireless system performance indicators.

所谓无源互调(Passive Inter-Modulation,简称“PIM”)就是指系统多个不同频率的载波信号通过系统无源器件的混频效应而相互调制所引起对系统的额外干扰。在现代通信系统中,当多个频率的载波信号通过一些无源器件时,都会产生互调失真。对于蜂窝移动通信系统而言,无源器件包含双工器、馈缆、塔放、避雷器、天线等,由于其机械连接的不可靠、使用具有磁滞特性的材料、污损的接触面等原因,不同频率的信号在材料连接处非线性混频,产生不同幅度的无源互调产物。而这些互调失真信号如果落到接收频带内,则会使接收信号的信噪比下降,严重影响通信系统的容量和质量。The so-called passive intermodulation (Passive Inter-Modulation, referred to as "PIM") refers to the additional interference to the system caused by the mutual modulation of multiple carrier signals of different frequencies in the system through the mixing effect of the passive components of the system. In modern communication systems, when carrier signals of multiple frequencies pass through some passive components, intermodulation distortion will occur. For cellular mobile communication systems, passive components include duplexers, feeder cables, towers, lightning arresters, antennas, etc., due to unreliable mechanical connections, materials with hysteresis characteristics, and contaminated contact surfaces , signals of different frequencies are mixed nonlinearly at the junction of the materials, producing passive intermodulation products of different amplitudes. However, if these intermodulation distortion signals fall into the receiving frequency band, the signal-to-noise ratio of the receiving signal will decrease, seriously affecting the capacity and quality of the communication system.

两个频率的互调失真是现代通信系统中最基本且普遍存在的问题。比如对于一个具有两个载频的无线收发系统,其载波互调之后会产生多阶互调失真。当二个(或更多)的载频信号通过一个无源器件,由于前述各种非线性因素,使其对信号产生混频作用,就像是一个混频二极管。设这二个载频为F1和F2,其调制可能产生二次谐波为2F1和2F2,这些频率所进一步产生的最大互调产物就是三阶互调失真,即为2F1-F2和2F2-F1。三阶互调产物(3rd-order Intermodulation,简称“IM3”)的典型指标是-153dBc。所谓IM3为-153dBc的意义就是当二个+43dBm的载频信号同时加到被测器件(DeviceUnder Test,简称“DUT”)时,其产生的IM3值不大于+43-153=-110dBm。Intermodulation distortion at two frequencies is the most fundamental and ubiquitous problem in modern communication systems. For example, for a wireless transceiver system with two carrier frequencies, multi-order intermodulation distortion will be generated after carrier intermodulation. When two (or more) carrier frequency signals pass through a passive device, due to the above-mentioned various nonlinear factors, it will have a mixing effect on the signals, just like a mixing diode. Assuming these two carrier frequencies are F1 and F2, the modulation may produce second harmonics as 2F1 and 2F2, and the maximum intermodulation products further generated by these frequencies are third-order intermodulation distortion, namely 2F1-F2 and 2F2-F1 . The typical index of the third-order intermodulation product (3rd-order Intermodulation, referred to as "IM3") is -153dBc. The meaning of the so-called IM3 being -153dBc is that when two +43dBm carrier frequency signals are applied to the device under test (Device Under Test, referred to as "DUT") at the same time, the resulting IM3 value is not greater than +43-153=-110dBm.

可见互调失真会降低通信系统的性能,发射信号中过大的互调产物会干扰其它的接收机,特别是当互调产物正好落在接收机频率范围之内时,将造成接收机性能严重下降甚至无法正常工作。以往,无线系统设计者较为关心有源器件的互调测试。随着通信系统的发展和系统质量的提高,对器件的无源互调的测量也越来越重视了。It can be seen that intermodulation distortion will reduce the performance of the communication system. Excessive intermodulation products in the transmitted signal will interfere with other receivers, especially when the intermodulation products just fall within the frequency range of the receiver, it will cause serious receiver performance. Descent doesn't even work properly. Traditionally, wireless system designers have been concerned with intermodulation testing of active devices. With the development of communication systems and the improvement of system quality, more and more attention has been paid to the measurement of passive intermodulation of devices.

但是对于单独每个器件进行测试并不能确保整个系统的性能能够达到指标,特别是在系统运行一定时间后,无法对系统进行监测,以便更好的维护,因此如果对系统进行整体的无源互调性能测试评价是当前急待解决的一个问题。However, testing each individual device cannot ensure that the performance of the entire system can reach the target, especially after the system has been running for a certain period of time, the system cannot be monitored for better maintenance, so if the overall passive interaction of the system Tuning performance test evaluation is an urgent problem to be solved at present.

尤其是对于移动通信基站系统,其设计安装及工作维护各个阶段较为独立。在安装之前系统各部件的性能经过测试达到一定标准,但在安装完成后特别是运行维护过程中,其系统的无源互调性能往往得不到有效的测试,给系统的稳定工作带来一定的隐患。特别是系统工作一段时间后,系统各部件不断老化,基站系统的无源互调性能可能进一步恶化,使得基站系统的无线性能下降,影响系统的良好运行。Especially for the mobile communication base station system, its design, installation and work maintenance are relatively independent in each stage. Before the installation, the performance of each component of the system has been tested to meet a certain standard, but after the installation is completed, especially during the operation and maintenance process, the passive intermodulation performance of the system is often not effectively tested, which brings a certain degree of stability to the system. hidden dangers. Especially after the system has been working for a period of time, the components of the system will continue to age, and the passive intermodulation performance of the base station system may further deteriorate, which will reduce the wireless performance of the base station system and affect the good operation of the system.

目前,对于移动通信基站系统的无源互调性能测试,仅局限与对各个无源部件的单独测试,并没有对整个基站系统各部件组合工作时的互调性能进行测试。现有的解决方案通常是对基站系统所使用到的双工器、馈缆、塔放、避雷器、天线等部件各自在安装前进行部件的无源互调性能测试,保证满足设计的指标。将各部件组装形成整体基站系统之后即无法对其进行测试。然而无论是由于安装环境或部件老化等问题引起的无源互调性能降低都将无法得到监测并维护,严重影响基站正常工作和维护。At present, the passive intermodulation performance test of the mobile communication base station system is only limited to the individual test of each passive component, and the intermodulation performance of the entire base station system when the components work together is not tested. The existing solution is usually to test the passive intermodulation performance of the duplexer, feeder cable, tower amplifier, lightning arrester, antenna and other components used in the base station system before installation to ensure that the design indicators are met. Once the components are assembled to form an overall base station system, they cannot be tested. However, the performance degradation of passive intermodulation caused by problems such as installation environment or component aging will not be monitored and maintained, seriously affecting the normal operation and maintenance of the base station.

在实际应用中,上述方案存在以下问题:基站各个部件在各自通过无源互调性能测试之后,并不能保证整个基站系统在安装之后能够满足PIM指标。In practical application, the above solution has the following problem: After each component of the base station passes the passive intermodulation performance test, it cannot guarantee that the entire base station system can meet the PIM index after installation.

事实上,由于部件组装及协调过程中各种因素,仍然会导致基站无源互调性能降低。比如,安装过程中安装不良引起部件之间连接不好,将等效引入新的互调因素;或者不同的部件之间的电磁兼容问题;或是基站载波、接收频段设置情况的改变,导致PIM影响范围的变化;或者外部环境的不同引起部件性能的进一步劣化;更常见的则是,由于基站系统工作一段时间后,部件老化、结构松动等原因,都会使得无源互调性能下降。In fact, due to various factors in the component assembly and coordination process, the passive intermodulation performance of the base station will still be reduced. For example, poor connection between components caused by poor installation during the installation process will equivalently introduce new intermodulation factors; or electromagnetic compatibility problems between different components; or changes in the carrier wave and receiving frequency band settings of the base station, resulting in PIM Changes in the scope of influence; or further degradation of component performance due to different external environments; more commonly, due to aging of components and loose structure after the base station system has been working for a period of time, the performance of passive intermodulation will decline.

以上种种情况,都不能由安装前部件单独测试来保证,也不可能通过拆卸部件进行单独测试的方法来解决。只能通过对基站系统整体进行无源互调性能检测,在日常维护中监测基站系统的性能变化,这是现有技术无法解决的技术问题。All of the above situations cannot be guaranteed by separate testing of components before installation, nor can it be resolved by disassembling components for separate testing. It is only possible to monitor the performance changes of the base station system during daily maintenance by performing passive intermodulation performance testing on the base station system as a whole, which is a technical problem that cannot be solved by existing technologies.

造成这种情况的主要原因在于,现有技术方案仅局限于对各个部件单独测试,无法对整个基站系统进行整体测试。The main reason for this situation is that the existing technical solutions are limited to testing each component individually, and cannot conduct an overall test on the entire base station system.

发明内容Contents of the invention

有鉴于此,本发明的主要目的在于提供一种移动通信基站系统无源互调性能测试方法,使得基站系统能够进行整体无源互调性能测试,提供精确的基站系统性能评价指标。In view of this, the main purpose of the present invention is to provide a method for testing passive intermodulation performance of a mobile communication base station system, so that the base station system can perform overall passive intermodulation performance testing and provide accurate base station system performance evaluation indicators.

为实现上述目的,本发明提供了一种移动通信基站系统无源互调性能测试方法,包含以下步骤In order to achieve the above object, the present invention provides a method for testing passive intermodulation performance of a mobile communication base station system, comprising the following steps

A待测基站系统的发射机按预设模式发射测试信号,所述预设模式是根据实际需要设定的发射接收控制流程;A. The transmitter of the base station system to be tested transmits a test signal according to a preset mode, and the preset mode is a transmission and reception control process set according to actual needs;

B所述基站系统的接收机按预设模式在测试频段内进行扫描接收,所述测试频段的范围按以下准则计算:先根据所述基站系统的待测试载波数目,确定其待测试无源互调的阶数;再根据所述无源互调阶数及所述载波的发射频段范围,确定所述无源互调的频段范围;最后计算所述无源互调的频段范围及所述基站系统的接收频段范围的交集,即得到所述测试频段的范围;B The receiver of the base station system scans and receives in the test frequency band according to the preset mode. The order of modulation; then according to the passive intermodulation order and the transmission frequency range of the carrier, determine the frequency range of the passive intermodulation; finally calculate the frequency range of the passive intermodulation and the base station The intersection of the ranges of the receiving frequency bands of the system is to obtain the range of the test frequency bands;

C根据接收信号频谱分析评价所述基站系统的无源互调性能。C evaluates the passive intermodulation performance of the base station system according to the spectrum analysis of the received signal.

其中,所述步骤A包含以下子步骤:Wherein, the step A includes the following sub-steps:

A1所述发射机关闭发射;The transmitter described in A1 turns off the transmission;

A2所述发射机依次发射至少一种测试信号;The transmitter in A2 sequentially transmits at least one test signal;

所述步骤B包含以下子步骤:Described step B comprises following substep:

B1当A1中所述发射机关闭发射时,所述接收机同时在所述测试频段内扫描接收原有外界干扰信号;B1 When the transmitter in A1 turns off the transmission, the receiver scans and receives the original external interference signal in the test frequency band at the same time;

B2当A2中所述发射机依次发射至少一种测试信号时,所述接收机同时依次在所述测试频段内扫描接收对应所述测试信号的接收信号。B2 When the transmitter in A2 sequentially transmits at least one test signal, the receiver simultaneously scans and receives received signals corresponding to the test signals in the test frequency band.

此外在所述方法中,所述步骤C包含以下子步骤In addition, in the method, the step C includes the following sub-steps

C1所述接收机依次接收的对应至少一种所述测试信号的接收信号中除去所述原有外界干扰信号得到纯测试接收信号;C1 removing the original external interference signal from the received signal corresponding to at least one of the test signals received by the receiver in turn to obtain a pure test received signal;

C2根据所述纯测试接收信号的频谱分析,对比其对应的所述测试信号的频谱,综合评价所述基站系统的无源互调性能。C2 compares the spectrum of the corresponding test signal according to the spectrum analysis of the pure test received signal, and comprehensively evaluates the passive intermodulation performance of the base station system.

此外在所述方法中,所述步骤A2中,所述测试信号为连续波,所述发射机在其中一个载波上发射扫频信号,在其他载波上发射固定频率信号;遍历完当前固定频率发射信号后,将固定频率发射信号更换到另一个载波频率上,再次对其中一个载波发射扫频信号,如此循环,直至两发射信号的所有频率组合;上述发射信号频率组合扫描可以依据具体情况对频率组合进行删减,以减少测试时间;In addition, in the method, in the step A2, the test signal is a continuous wave, and the transmitter transmits a frequency sweep signal on one of the carriers, and transmits a fixed frequency signal on other carriers; after traversing the current fixed frequency transmission After the signal, change the fixed-frequency transmission signal to another carrier frequency, and then transmit the sweep signal to one of the carriers again, and so on, until all frequency combinations of the two transmission signals; the above-mentioned transmission signal frequency combination scan can be adjusted according to specific conditions Combined deletions to reduce test time;

所述步骤B2中,所述接收机在所述测试信号对应的待测互调频段内进行同步扫描接收。In the step B2, the receiver performs synchronous scanning and receiving in the intermodulation frequency band corresponding to the test signal.

此外在所述方法中,所述步骤A中,所述基站系统根据测试控制台下发的命令控制所述发射机发射;In addition, in the method, in the step A, the base station system controls the transmitter to transmit according to the command issued by the test console;

所述步骤B中,所述基站系统将所述接收机的所述接收信号上传给所述测试控制台;In the step B, the base station system uploads the received signal of the receiver to the test console;

所述步骤C中,所述测试控制台完成对所述接收信号的分析和所述无源互调性能的评价。In the step C, the test console completes the analysis of the received signal and the evaluation of the passive intermodulation performance.

此外在所述方法中,所述测试控制台通过近端控制接口直接控制所述基站系统,或者通过基站控制器接口和移动通信网络在远端控制所述基站系统进行测试。In addition, in the method, the test console directly controls the base station system through a near-end control interface, or controls the base station system remotely through a base station controller interface and a mobile communication network for testing.

此外在所述方法中,所述测试控制台通过直接在所述基站系统上安装测试软件,或者通过远端加载所述测试软件,以实现对所述基站系统的控制。In addition, in the method, the test console controls the base station system by directly installing test software on the base station system, or loading the test software remotely.

通过比较可以发现,本发明的技术方案与现有技术的主要区别在于,通过控制发射机按预设模式发射测试信号,同时控制接收机在测试频段内扫描接收,并对接收信号进行频谱分析来评价基站系统整体的无源互调性能;By comparison, it can be found that the main difference between the technical solution of the present invention and the prior art is that the transmitter is controlled to transmit the test signal in a preset mode, and the receiver is controlled to scan and receive in the test frequency band at the same time, and the spectrum analysis is performed on the received signal. Evaluate the passive intermodulation performance of the base station system as a whole;

通过在关闭发射机的情况下接收原有外界干扰信号,以去除外界的影响,精确测量系统本身的无源互调产物;By receiving the original external interference signal when the transmitter is turned off, the external influence can be removed, and the passive intermodulation product of the system itself can be accurately measured;

通过已知载波频率范围、互调阶数及接收频率范围等参数来精确计算所接收的测试频段,并采用扫描发射和接收连续波的方式提高测试信号接收质量;Accurately calculate the received test frequency band by known parameters such as carrier frequency range, intermodulation order and receiving frequency range, and improve the quality of test signal reception by scanning transmission and receiving continuous waves;

通过测试控制台对基站系统的控制和对接收信号的频谱强度等分析实现对基站系统的高效测试与准确评价;Efficient testing and accurate evaluation of the base station system can be realized through the control of the base station system by the test console and the analysis of the spectrum strength of the received signal;

通过近端控制接口和远端网络访问实现两种方式的测试控制,分别提供直接安装和远程加载测试软件的方案,方便维护人员进行测试。Two methods of test control are realized through the local control interface and remote network access, and the solutions of direct installation and remote loading of test software are provided respectively, which is convenient for maintenance personnel to test.

这种技术方案上的区别,带来了较为明显的有益效果,即基于本发明的基站系统整体测试方案,可以对安装完毕或工作一段时间后的基站系统进行整体无源互调性能测试,无需外部的测试仪器,不需要拆卸部件单独测试,极大地方便了基站系统的监测和维护工作;The difference in this technical solution has brought more obvious beneficial effects, that is, based on the overall test scheme of the base station system of the present invention, the overall passive intermodulation performance test can be performed on the base station system after installation or after working for a period of time. The external test instrument does not need to disassemble the parts to test separately, which greatly facilitates the monitoring and maintenance of the base station system;

由于测试前先对原有外界干扰进行接收与去除,大大提高了对系统本身互调干扰测试的精确度,提高系统性能评价的可信度,对系统无源互调问题的定位和性能的检测也有很大的作用;Since the original external interference is received and removed before the test, the accuracy of the intermodulation interference test of the system itself is greatly improved, the credibility of the system performance evaluation is improved, and the positioning and performance detection of the system passive intermodulation problem also has a great effect;

另外,由系统参数进行互调干扰频段的精确估计也使得测试范围更加明确,测试效率大大提高,同样的采用连续波的扫描发射和接收,也使得测试信号信噪比得到改善,能够全面测试系统潜在的互调干扰因素;In addition, the accurate estimation of the intermodulation interference frequency band based on the system parameters also makes the test range clearer and the test efficiency is greatly improved. Similarly, the continuous wave scanning transmission and reception also improves the signal-to-noise ratio of the test signal and enables a comprehensive test system Potential intermodulation interference factors;

最后,通过近端控制接口、内部安装测试软件或远端控制、加载测试软件两种方案的提供,工作人员可以远程控制网络各地的基站测试,大大简化了测试维护人员的工作,极大地方便了基站开通、定期维护和故障处理等,复杂的测试软件可以通过远端加载到基站来实施,分析功能大大加强,避免了系统硬件的改造,同时也节省了网络维护的人力、物力成本。Finally, through the provision of two solutions: the near-end control interface, the internal installation test software or the remote control and loading test software, the staff can remotely control the base station tests around the network, which greatly simplifies the work of test and maintenance personnel and greatly facilitates For base station activation, regular maintenance, and fault handling, complex test software can be loaded to the base station remotely for implementation. The analysis function is greatly enhanced, which avoids the transformation of system hardware and saves manpower and material costs for network maintenance.

附图说明Description of drawings

图1是移动通信基站系统组成示意图;Fig. 1 is a schematic diagram of the composition of a mobile communication base station system;

图2是根据本发明的实施方式的基站系统无源互调性能测试流程图。Fig. 2 is a flow chart of passive intermodulation performance testing of a base station system according to an embodiment of the present invention.

具体实施方式Detailed ways

为使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明作进一步地详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

本发明的基本原理是通过软件控制设计基站的发射机按照预定的模式发射预定的测试信号,同时控制接收机在预计的测试频段内同步扫描接收信号,从而可以从两者频谱的对比分析中评价系统互调干扰的性能指标。在这个基本思路之上,还有一些附加的技术细节能够进一步提高测试的精度、效率、降低测试的成本、方便测试操作等。这类技术细节比如有:通过在关闭发射机的时候先接收原有外界干扰来去除外界干扰的影响;通过由载波频率接收频段等预先估计互调干扰所在频段,并控制接收机在该频段接收,提高测试效率;通过基站近端控制接口或远端网络实现测试控制台对基站的控制,通过直接安装和远程加载测试软件实现基站系统测试功能的升级等等,这些技术都方便了测试工作的进行,降低了测试成本。The basic principle of the present invention is to control and design the transmitter of the base station through software to transmit a predetermined test signal according to a predetermined pattern, and simultaneously control the receiver to scan the received signal synchronously in the expected test frequency band, so that it can be evaluated from the comparative analysis of the frequency spectrum of the two Performance index of system intermodulation interference. On top of this basic idea, there are some additional technical details that can further improve the accuracy and efficiency of the test, reduce the cost of the test, and facilitate the test operation. Such technical details include: removing the influence of external interference by first receiving the original external interference when the transmitter is turned off; pre-estimating the frequency band where the intermodulation interference is located by the carrier frequency receiving frequency band, etc., and controlling the receiver to receive in this frequency band , improve test efficiency; realize the control of the test console to the base station through the base station near-end control interface or the remote network, and realize the upgrade of the base station system test function through direct installation and remote loading of test software, etc. These technologies facilitate the testing work carried out, reducing the cost of testing.

下面以典型的基站系统为例对本发明的技术细节进行进一步的描述。图1就是一个典型的两个载波频率的基站收发系统示意图。图中给出了基站系统从控制侧到空中接口侧的各部件及其连接顺序。The technical details of the present invention will be further described below by taking a typical base station system as an example. Figure 1 is a schematic diagram of a typical base station transceiver system with two carrier frequencies. The figure shows the components of the base station system from the control side to the air interface side and their connection sequence.

在基站控制侧一般有两个接口。其中一个近端的控制接口,可在基站近端通过计算机对基站进行控制。同时有一个与基站控制器相连的接口,通过此接口与基站控制器相连,同时通过此接口与无线系统的操作维护系统相连,使得可以在无线系统的任何一个结点上对基站进行远程控制。整个蜂窝移动通信网络的各个小区基站就是通过基站控制器连接到网络中,并且实现各个基站之间的互访与通信。本发明就利用这两个接口提供的两种方式的接入控制,细节在后文将给出。There are generally two interfaces on the control side of the base station. One of the near-end control interfaces can control the base station through a computer at the near-end of the base station. At the same time, there is an interface connected to the base station controller, through which it is connected to the base station controller, and at the same time connected to the operation and maintenance system of the wireless system through this interface, so that the base station can be remotely controlled on any node of the wireless system. Each cell base station of the entire cellular mobile communication network is connected to the network through a base station controller, and realizes mutual access and communication between each base station. The present invention utilizes the two modes of access control provided by these two interfaces, and the details will be given later.

该基站系统的组成结构中,有两个发射机和两个接收机,分别对应不同的载波信道。发射信号的流向是:发射机1和发射机2产生不同载波的发射信号,进入发射合路器后合成一路信号,再进入收发双工器。通过馈线、避雷器、塔放后送到天线发射出去。接收信号的流向是:天线接收到的信号通过馈线、塔放、避雷器进入收发双工器,经由收发双工器的接收信号通过接收分路器分成两路,分别进入接收机1和接收机2。In the structure of the base station system, there are two transmitters and two receivers corresponding to different carrier channels. The flow direction of the transmission signal is: Transmitter 1 and Transmitter 2 generate transmission signals of different carriers, enter the transmission combiner, synthesize one signal, and then enter the transceiver duplexer. After passing through the feeder, lightning arrester, and tower, it is sent to the antenna for emission. The flow direction of the received signal is: the signal received by the antenna enters the transceiver duplexer through the feeder, the tower amplifier, and the lightning arrester, and the received signal via the transceiver duplexer is divided into two paths through the receiving splitter and enters receiver 1 and receiver 2 respectively. .

如前所述,由于收发双工器、馈缆、避雷器、塔放和天线都可能产生无源互调产物,造成对接收机接收信号的不良影响,因此,每一个环节都需要保证无源互调产物足够小,并且需要不同部件的连接界面上做到可靠连接和低的无源互调产物。As mentioned above, since the transceiver duplexer, feeder cable, lightning arrester, tower amplifier and antenna may produce passive intermodulation products, causing adverse effects on the signal received by the receiver, therefore, every link needs to ensure passive intermodulation The modulation products are small enough, and it is necessary to achieve reliable connection and low passive intermodulation products on the connection interface of different components.

然而整个基站的无源互调产物的大小不但与上述所涉及的部件相关,还与基站系统安装操作相关,基站系统使用一段时间后无源互调产物也可能上升,需要定期的维护测试。传统的方法是分别保证每个部件的性能,安装连接界面时施工仔细来保障系统的无源互调性能。在整个基站系统的无源互调性能保障上有一定的风险,而且一旦随着环境影响及时间变迁都会使得基站系统发生不可预料的劣化,这都需要对基站系统进行方便的整体测试。However, the size of the passive intermodulation products of the entire base station is not only related to the above-mentioned components involved, but also related to the installation and operation of the base station system. After the base station system has been used for a period of time, the passive intermodulation products may also increase, requiring regular maintenance and testing. The traditional method is to ensure the performance of each component separately, and carefully construct the connection interface to ensure the passive intermodulation performance of the system. There are certain risks in the passive intermodulation performance guarantee of the entire base station system, and once the base station system will experience unpredictable degradation due to environmental influences and time changes, it is necessary to conduct a convenient overall test on the base station system.

本发明所给出的基站系统整体互调干扰测试方案能够解决这一问题,使基站可以支持连接完整的基站系统的无源互调产物测试,大大提高了基站系统实际无源互调性能度量的可信度。本发明的第一实施方式中,按以下三个主要步骤实现对基站系统的整体测试:The overall intermodulation interference test scheme of the base station system given by the present invention can solve this problem, so that the base station can support the passive intermodulation product test of the complete base station system, greatly improving the accuracy of the actual passive intermodulation performance measurement of the base station system credibility. In the first embodiment of the present invention, the overall test of the base station system is realized according to the following three main steps:

首先,控制待测基站系统的发射机按预设模式发射测试信号,这里的测试信号是经过设计的特定的信号,能够使得接收机在接收时信噪比较高,这里的预设模式即是测试工作中各个必要环节所需要发射的测试信号,或者发射机的开关操作;First, control the transmitter of the base station system to be tested to transmit test signals in a preset mode. The test signal here is a specially designed signal that can make the receiver have a higher signal-to-noise ratio when receiving. The preset mode here is The test signal that needs to be transmitted in each necessary link of the test work, or the switch operation of the transmitter;

与此同时,控制基站系统的接收机按预设模式在测试频段内进行扫描接收,接收机的接收必然是与发射机对应的,所谓扫描接收即在接收频段内进行扫频,这是由接收机对不同信道的控制实现的;At the same time, the receiver controlling the base station system scans and receives in the test frequency band according to the preset mode. The reception of the receiver must correspond to the transmitter. The control of different channels by the machine is realized;

最后,根据接收信号频谱分析评价基站系统的无源互调性能,在已知测试信号之后,即可根据其对应接收信号的对比来监测出互调干扰的大小,从而进行评价。Finally, the passive intermodulation performance of the base station system is evaluated according to the spectrum analysis of the received signal. After the test signal is known, the magnitude of the intermodulation interference can be monitored and evaluated according to the comparison of the corresponding received signal.

上述第一实施方式的方案中并没有给出详细的发射模式、测试信号、接收频段及分析评价方法的细节及其原理,下面逐一在实施方式中进行进一步阐明。本发明的第二实施方式在第一实施方式的基础上,引入对原有外界干扰信号的测量及去除,引入测试信号的发射及同步接收,引入测试系统的软件实现及其控制台定义等。The details and principles of the detailed transmission mode, test signal, receiving frequency band, and analysis and evaluation method are not given in the solution of the above-mentioned first embodiment, which will be further clarified in the following embodiments one by one. On the basis of the first embodiment, the second embodiment of the present invention introduces the measurement and removal of the original external interference signal, the transmission and synchronous reception of the test signal, the software implementation of the test system and its console definition, etc.

前面提到的预设模式是根据实际需要设定的发射接收控制流程,第二实施方式中所采用的模式是先关闭发射机以接收原有外界干扰,然后依次根据命令发射各种测试信号,同时控制接收机同步扫描接收这些信号及产生的干扰。对应的在评价时,也要将接收信号减去原有的外界干扰,以得到纯测试接收信号,即只有测试信号产生的接收信号及其本身互调干扰的信号。The preset mode mentioned above is the transmission and reception control process set according to actual needs. The mode adopted in the second embodiment is to first turn off the transmitter to receive the original external interference, and then transmit various test signals according to the order in turn. At the same time, the receiver is controlled to scan and receive these signals and the generated interference synchronously. Correspondingly, in the evaluation, the received signal should be subtracted from the original external interference to obtain a pure test received signal, that is, only the received signal generated by the test signal and its own intermodulation interference signal.

前面所述的这些步骤,在第二实施方式中,均通过测试软件实现,并由测试控制台控制进行。所述测试软件是在基站系统基础上附加的软件,无须硬件升级即可实现测试,降低成本。控制台在各个步骤中的功能如下:基站系统根据测试控制台下发的命令控制发射机发射;基站系统将接收机的接收信号上传给测试控制台;测试控制台完成对接收信号的分析和无源互调性能的评价。这里的测试控制台即测试软件的计算机后台,由测试维护人员操作,这一点极大地方便了测试的进行。In the second embodiment, the aforementioned steps are all implemented by testing software and controlled by the testing console. The test software is additional software based on the base station system, and the test can be realized without upgrading the hardware, thereby reducing the cost. The functions of the console in each step are as follows: the base station system controls the transmitter to transmit according to the commands issued by the test console; the base station system uploads the received signal of the receiver to the test console; the test console completes the analysis and analysis of the received signal Evaluation of source intermodulation performance. The test console here is the computer background of the test software, which is operated by test maintenance personnel, which greatly facilitates the test.

述及测试软件和测试控制台,这里给出本发明的第三个实施方式,该实施方式在第二实施方式的基础上,为了方便维护操作测试进行,充分利用基站系统现有的控制侧的两个接口,提供了针对不同需求的两种接入方式,即近端控制接口和远端控制接口,测试控制台通过近端控制接口直接控制基站系统,或者通过基站控制器接口和移动通信网络在远端控制基站系统进行测试。Referring to the test software and the test console, here is the third embodiment of the present invention. On the basis of the second embodiment, in order to facilitate the maintenance and operation test, the existing control side of the base station system is fully utilized. Two interfaces provide two access methods for different needs, namely, the near-end control interface and the remote control interface. The test console directly controls the base station system through the near-end control interface, or through the base station controller interface and the mobile communication network Test at the remote control base station system.

这两种接入方式分别对应测试软件的内部安装或远端加载,测试控制台通过直接在基站系统上安装测试软件,或者通过远端加载测试软件,以实现对基站系统的控制。可见,第三实施方式中给出的这两种接入方式,尤其是第二种通过现有移动网络远端接入、加载测试软件并控制测试进行的维护方式,非常适合现有移动网络地域分布广的现状,很好地解决了维护人员的困难,极大地方便了维护测试工作,节省了人力成本。These two access methods correspond to the internal installation or remote loading of the test software respectively. The test console controls the base station system by directly installing the test software on the base station system or by loading the test software remotely. It can be seen that the two access methods given in the third embodiment, especially the second maintenance method through remote access to the existing mobile network, loading test software and controlling the test, are very suitable for existing mobile network regions The current situation of wide distribution solves the difficulties of maintenance personnel, greatly facilitates maintenance and testing work, and saves labor costs.

有鉴于此,高效的基站维护操作方式将变得方便,比如基站通过与基站控制器的接口连接到无线系统的维护网上,在无线系统的每一个结点上都可以远程实施对基站的控制,因此可以远程对基站进行无源互调性能测试的操作;同时基站通过基站近端的维护口,也可以实施对基站的近端控制。而基站可内置本发明的测试软件,或通过近端或远端控制接口在线加载测试软件。在需要对基站系统无源互调性能进行测试时,按下面的步骤进行。基站测试得到的数据通过基站对外接口上传到后台计算机,使用后台的计算机对测试数据进一步分析,得到基站系统的无源互调性能。In view of this, the efficient base station maintenance operation method will become convenient. For example, the base station is connected to the maintenance network of the wireless system through the interface with the base station controller, and the base station can be remotely controlled on each node of the wireless system. Therefore, the passive intermodulation performance test operation of the base station can be carried out remotely; at the same time, the base station can also implement the near-end control of the base station through the maintenance port of the near-end of the base station. The base station can have built-in test software of the present invention, or load the test software online through the near-end or remote control interface. When it is necessary to test the passive intermodulation performance of the base station system, follow the steps below. The data obtained from the base station test is uploaded to the background computer through the external interface of the base station, and the background computer is used to further analyze the test data to obtain the passive intermodulation performance of the base station system.

图2给出根据这些方案在本发明的实施方式中的基站系统测试方法的详细流程。Fig. 2 shows the detailed flow of the base station system testing method in the embodiment of the present invention according to these schemes.

在步骤201中,维护测试人员在近端或远端控制台,通过近端控制接口或网络接口,接入待测基站,如果基站没有测试软件,则需要安装或加载测试软件,加载成功后,即进入测试阶段,下发命令关闭基站正常工作流程,进入测试流程。In step 201, the maintenance tester accesses the base station to be tested through the near-end control interface or network interface at the near-end or remote console. If the base station does not have test software, the test software needs to be installed or loaded. After the loading is successful, That is to say, it enters the testing stage, issues a command to close the normal work flow of the base station, and enters the testing process.

接着进入步骤202,测试控制台下发命令,基站系统关闭所有发射机,准备接收外界干扰信号;Then enter step 202, the test console issues an order, the base station system turns off all transmitters, and prepares to receive external interference signals;

同时在步骤203中,测试控制台令基站系统开启接收机在预先估计好的测试频段内扫描接收原有外界干扰信号,并传回控制台,控制台将其保存;Simultaneously in step 203, the test console makes the base station system turn on the receiver to scan and receive the original external interference signal in the pre-estimated test frequency band, and transmit it back to the console, and the console saves it;

然后进入步骤204中,控制台根据预先的设定,依次下发命令,基站系统的发射机依次发射各种测试信号,这些测试信号的频率、调制方式等都由控制台的命令控制;Then enter step 204, the console sends commands sequentially according to the preset settings, and the transmitter of the base station system transmits various test signals in sequence, and the frequency and modulation mode of these test signals are all controlled by the commands of the console;

同时在步骤205中,基站系统的接收机同步地测试频段内扫描接收对应各种测试信号的接收信号,并将其传回控制台,这里扫描接收可以是对各个频分复用的信道进行依次接收。At the same time, in step 205, the receiver of the base station system scans and receives the received signals corresponding to various test signals in the frequency band synchronously, and sends them back to the console. take over.

在步骤206中,判断测试流程中是否已经完成了所有测试信号的发射和接收,如果是则退出循环到步骤207中,否则返回步骤204中继续发射测试信号。In step 206, it is judged whether the transmission and reception of all test signals have been completed in the test process, if yes, exit the loop and go to step 207, otherwise return to step 204 to continue transmitting test signals.

在步骤207中,在后台根据采集的接收信号进行评价。首先把接收机依次接收的对应各种测试信号的接收信号中除去原有外界干扰信号得到纯测试接收信号;In step 207, an evaluation is performed in the background based on the collected received signals. First, remove the original external interference signal from the received signals corresponding to various test signals received by the receiver in sequence to obtain a pure test received signal;

然后在步骤208中,后台根据该纯测试接收信号的频谱分析,并对比其对应的测试信号的频谱,综合评价基站系统的无源互调性能。Then in step 208, the background analyzes the spectrum of the pure test received signal and compares the spectrum of the corresponding test signal to comprehensively evaluate the passive intermodulation performance of the base station system.

注意到上述流程中,并没有提及如何设计测试信号的模式,以及如何估计接收频段的范围,事实上这两点也是本发明的关键。如何设计测试信号使得接收信噪比达到要求,如何估计精确的接收频段的范围使得性能测试更明确,这些都影响测试效率和精度。下面将详细阐述这两个问题。It is noted that in the above process, there is no mention of how to design the mode of the test signal and how to estimate the range of the receiving frequency band. In fact, these two points are also the key points of the present invention. How to design the test signal to make the receiving signal-to-noise ratio meet the requirements, and how to estimate the range of the accurate receiving frequency band to make the performance test more clear, all of which affect the test efficiency and accuracy. These two issues are elaborated below.

本发明的第四实施方式在第二实施方式的基础上按以下方法计算接收机接收的测试频段范围:先根据基站系统的待测试载波数目,确定其待测试无源互调的阶数;再根据无源互调阶数及载波的发射频段范围,确定无源互调的频段范围;最后计算无源互调的频段范围及基站系统的接收频段范围的交集,即得到测试频段的范围。In the fourth embodiment of the present invention, on the basis of the second embodiment, the test frequency range received by the receiver is calculated by the following method: first, according to the number of carriers to be tested in the base station system, determine the order of the passive intermodulation to be tested; then According to the passive intermodulation order and the transmission frequency range of the carrier, the frequency range of the passive intermodulation is determined; finally, the intersection of the frequency range of the passive intermodulation and the receiving frequency range of the base station system is calculated to obtain the range of the test frequency band.

譬如在第二代全球移动通信系统(Global System of MobileCommunication,简称“GSM”)的基站系统中,载波频率有900MHz和1800MHz两种。For example, in the base station system of the second generation Global System of Mobile Communication (GSM for short), there are two carrier frequencies of 900MHz and 1800MHz.

在900MHz的GSM通信系统中,由发射频段产生的三阶互调产物会落入到自己的接收频段内。因此对于待测的三阶互调IM3,需要进一步计算其频率范围。In the 900MHz GSM communication system, the third-order intermodulation products generated by the transmitting frequency band will fall into its own receiving frequency band. Therefore, for the third-order intermodulation IM3 to be tested, its frequency range needs to be further calculated.

三阶互调产物的频率为FIM3=2F1-F2。根据典型的P-GSM900频率范围设置:基站发射频率935~960MHz。因此F1范围[935、960],F2范围[935、960]。要先计算FIM3的取值范围即互调的频段范围,然后再看这个频段与接收机频段是否有交集,如果有的话其交集即为我们所求的接收机的测试频段。The frequency of the third-order intermodulation product is FIM3=2F1-F2. According to the typical P-GSM900 frequency range settings: base station transmission frequency 935 ~ 960MHz. So F1 ranges [935, 960], F2 ranges [935, 960]. First calculate the value range of FIM3, which is the frequency range of intermodulation, and then check whether this frequency band overlaps with the receiver frequency band. If so, the intersection is the test frequency band of the receiver we are looking for.

要求FIM3的取值范围,只要求出其最小值FIM3(min)和最大值FIM3(max),根据发射频率范围,容易求得:FIM3(min)=2F1min-F2max=2×935-960=910;FIM3(max)=2F1max-F2min=2×960-935=985。因此FIM3范围[910、985]。The value range of FIM3 is required, only its minimum value FIM3(min) and maximum value FIM3(max) are required. According to the range of transmission frequency, it is easy to obtain: FIM3(min)=2F1min-F2max=2×935-960=910 ; FIM3(max)=2F1max−F2min=2×960−935=985. Hence the FIM3 range [910, 985].

而P-GSM900频率范围设置的基站接收频率为890~915MHz,可见[910、985]与[890、915]有相交部分,其交集也就是接收机的测试频段为[910、915]。The base station receiving frequency set in the P-GSM900 frequency range is 890~915MHz. It can be seen that [910, 985] and [890, 915] have intersections, and the intersection is the test frequency band of the receiver is [910, 915].

按照同样的方法,还可以算出五阶等更高阶的无源互调产物。落入接收频段的五阶产物信号频率范围是:最小值FIM5(min)和最大值FIM5(max):FIM5(min)=3F1min-2F2max=3×935-2×960=885;FIM5(max)=3F1max-2×F2min=3×960-2×935=1010。可见FIM5的[885、1010]与[890、915]也有相交部分,也就是说五阶互调的接收频段范围为[885、915]。According to the same method, the fifth-order and other higher-order passive intermodulation products can also be calculated. The fifth-order product signal frequency range falling into the receiving frequency band is: minimum value FIM5 (min) and maximum value FIM5 (max): FIM5 (min) = 3F1min-2F2max = 3 × 935-2 × 960 = 885; FIM5 (max) =3F1max-2×F2min=3×960-2×935=1010. It can be seen that [885, 1010] and [890, 915] of FIM5 also have intersecting parts, that is to say, the receiving frequency range of the fifth-order intermodulation is [885, 915].

通过这样的计算即可以确定各阶互调产物是否落入接收范围,从而确定测试频段并接收该阶互调产物。Through such calculation, it can be determined whether the intermodulation products of each order fall into the receiving range, so as to determine the test frequency band and receive the intermodulation products of this order.

再如第三代的宽带码分多址移动通信(Wideband Code Division MultipleAccess,简称“WCDMA”)基站系统中,I区的频率范围是:基站发射频率2110MHz~2170MHz,基站接收频率为1920MHz~1980MHz,通过类似的计算,任意两个发射信号的三阶互调产物不会落入到其自身的接收频段内。通过逐阶递增的遍历重复计算,可以发现,7阶是无源互调的最低阶产物。同上计算方法:最小值FIM7(min)和最大值FIM7(max):FIM7(min)=4F1min-3F2max=4×2110-3×2170=1930;FIM7(max)=4F1max-3×F2min=4×2170-3×2110=2350。可见,FIM7范围[1930、2110]与接收范围[1920、1980]有相交部分,也就是说FIM7的接收机接收的测试频段为[1930、1980]。Another example is the third-generation Wideband Code Division Multiple Access ("WCDMA") base station system, the frequency range of Zone I is: base station transmission frequency 2110MHz ~ 2170MHz, base station reception frequency 1920MHz ~ 1980MHz, Through similar calculations, the third-order intermodulation products of any two transmitted signals will not fall into their own receiving frequency bands. It can be found that the 7th order is the lowest-order product of passive intermodulation through traversal and repeated calculations step by step. Calculation method as above: minimum value FIM7(min) and maximum value FIM7(max): FIM7(min)=4F1min-3F2max=4×2110-3×2170=1930; FIM7(max)=4F1max-3×F2min=4× 2170-3×2110=2350. It can be seen that the FIM7 range [1930, 2110] intersects with the receiving range [1920, 1980], that is to say, the test frequency band received by the FIM7 receiver is [1930, 1980].

另外,对于测试信号的设计及发射接收方式,本发明的第四实施方式按如下方式实现:测试信号一般采用连续波(Continous Wave),可以提高接收信噪比,发射机在其中一个载波上发射扫频信号,在其他载波上发射固定频率信号,遍历完当前固定频率发射信号后,将固定频率发射信号更换到另一个载波频率上,再次对其中一个载波发射扫频信号,如此循环,直至两发射信号的所有频率组合;上述发射信号频率组合扫描可以依据具体情况对频率组合进行删减,以减少测试时间;这样可以在整个互调干扰范围内测试;同时接收机在测试信号对应的待测互调频段内进行同步扫描接收,这样即可以从接收到的信号的频谱混杂程度得知干扰情况。In addition, for the design of the test signal and the way of transmitting and receiving, the fourth embodiment of the present invention is realized in the following manner: the test signal generally adopts continuous wave (Continous Wave), which can improve the receiving signal-to-noise ratio, and the transmitter transmits on one of the carrier waves. Sweep frequency signals, transmit fixed frequency signals on other carriers, after traversing the current fixed frequency transmission signals, change the fixed frequency transmission signals to another carrier frequency, and transmit frequency sweep signals to one of the carriers again, and so on until two All frequency combinations of the transmitted signal; the frequency combination scan of the above-mentioned transmitted signal can be deleted according to the specific situation to reduce the test time; this can test in the entire range of intermodulation interference; at the same time, the receiver is in the corresponding test signal Synchronous scanning and receiving are performed in the intermodulation frequency band, so that the interference situation can be known from the mixed degree of the spectrum of the received signal.

基站系统正常工作的频点配置通常不满足各阶次互调产物频率关系,因此基站无源互调性能可能已下降的情况下,对其他接收机已经造成干扰仍然不能发现。本发明通过强制基站发射易于检测的连续波信号,并配置基站的收发信号频点到最低阶产物的频率,并扫描基站发射信号前后在无源互调区间的无源互调产物,得到基站系统的无源互调性能。The frequency point configuration of the normal operation of the base station system usually does not satisfy the frequency relationship of intermodulation products of each order. Therefore, when the passive intermodulation performance of the base station may have declined, the interference to other receivers cannot be found. The invention obtains the base station system by forcing the base station to transmit an easy-to-detect continuous wave signal, configuring the frequency point of the transceiver signal of the base station to the frequency of the lowest-order product, and scanning the passive intermodulation products in the passive intermodulation interval before and after the base station transmits the signal passive intermodulation performance.

综上所述,依据不同的发射频率和接收频率工作范围,可以算出无源互调的最低阶产物的频率分布。通过配置两个发射信号的频率和功能,接收机对准互调产物的频率和对产物的功率进行测量,可以计算出系统的无源互调性能。To sum up, according to different operating ranges of transmitting frequency and receiving frequency, the frequency distribution of the lowest order product of passive intermodulation can be calculated. By configuring the frequency and function of the two transmitted signals, the receiver aligns the frequency of the intermodulation product and measures the power of the product, and the passive intermodulation performance of the system can be calculated.

比如在上述典型的P-GSM900频率范围的基站系统中,通过计算可以知道最低阶的互调产物是3阶,5阶也落入接收频带,可以按照落入接收频带的发射和接收频率关系配置两个发射信号,例如,固定一个信号的频率在935MHz,扫描另一发射信号的频率,有预算的结果可知,另一频率从955MHz开始到960MHz截止,其与935MHz的信号三阶互调产物落在接收频段内,即910~915MHz。接收机接收频率并同步的与扫描的发射信号频率一同变化,得到910~915MHz内三阶产物的能量,按前述方法得到无源互调性能。假设发射功率为两43dBm信号,产物为-100dBm,则无源互调性能为-143dBc。For example, in the base station system of the above-mentioned typical P-GSM900 frequency range, it can be known through calculation that the lowest order intermodulation product is the third order, and the fifth order also falls into the receiving frequency band, which can be configured according to the relationship between the transmitting and receiving frequencies falling into the receiving frequency band Two transmitted signals, for example, fix the frequency of one signal at 935MHz, and scan the frequency of the other transmitted signal. According to the budgeted results, it can be known that the other frequency starts from 955MHz to 960MHz, and its third-order intermodulation product falls with the 935MHz signal. In the receiving frequency band, namely 910~915MHz. The receiving frequency of the receiver is changed synchronously with the scanning frequency of the transmitted signal to obtain the energy of the third-order product in 910-915 MHz, and the passive intermodulation performance is obtained according to the aforementioned method. Assuming that the transmit power is two 43dBm signals and the product is -100dBm, the passive intermodulation performance is -143dBc.

熟悉本领域的技术人员可以理解,上述对本发明各实施方式的描述中,所采用的具体参数设置、具体实现细节举例,在各种实际引用环境中有其他不同情况,但均在本发明的宗旨范围之内,不影响本发明实质和范围。Those skilled in the art can understand that in the above descriptions of the various embodiments of the present invention, the specific parameter settings and specific examples of implementation details used have other different situations in various actual reference environments, but they are all within the scope of the present invention. Within the scope, it does not affect the spirit and scope of the present invention.

虽然通过参照本发明的某些优选实施方式,已经对本发明进行了图示和描述,但本领域的普通技术人员应该明白,可以在形式上和细节上对其作各种改变,而不偏离本发明的精神和范围。Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present invention. The spirit and scope of the invention.

Claims (6)

1.一种移动通信基站系统无源互调性能测试方法,其特征在于,包含以下步骤1. A method for testing passive intermodulation performance of a mobile communication base station system, characterized in that it comprises the following steps A待测基站系统的发射机按预设模式发射测试信号,所述预设模式是根据实际需要设定的发射接收控制流程;A. The transmitter of the base station system to be tested transmits a test signal according to a preset mode, and the preset mode is a transmission and reception control process set according to actual needs; B所述基站系统的接收机按预设模式在测试频段内进行扫描接收,所述测试频段的范围按以下准则计算:先根据所述基站系统的待测试载波数目,确定其待测试无源互调的阶数;再根据所述无源互调阶数及所述载波的发射频段范围,确定所述无源互调的频段范围;最后计算所述无源互调的频段范围及所述基站系统的接收频段范围的交集,即得到所述测试频段的范围;B The receiver of the base station system scans and receives in the test frequency band according to the preset mode. The order of modulation; then according to the passive intermodulation order and the transmission frequency range of the carrier, determine the frequency range of the passive intermodulation; finally calculate the frequency range of the passive intermodulation and the base station The intersection of the ranges of the receiving frequency bands of the system is to obtain the range of the test frequency bands; C根据接收信号频谱分析评价所述基站系统的无源互调性能。C evaluates the passive intermodulation performance of the base station system according to the spectrum analysis of the received signal. 2.根据权利要求1所述的移动通信基站系统无源互调性能测试方法,其特征在于,所述步骤A包含以下子步骤:2. mobile communication base station system passive intermodulation performance test method according to claim 1, is characterized in that, described step A comprises following sub-steps: A1所述发射机关闭发射;The transmitter described in A1 turns off the transmission; A2所述发射机依次发射至少一种测试信号;The transmitter in A2 sequentially transmits at least one test signal; 所述步骤B包含以下子步骤:Described step B comprises following substep: B1当A1中所述发射机关闭发射时,所述接收机同时在所述测试频段内扫描接收原有外界干扰信号;B1 When the transmitter in A1 turns off the transmission, the receiver scans and receives the original external interference signal in the test frequency band at the same time; B2当A2中所述发射机依次发射至少一种测试信号时,所述接收机同时依次在所述测试频段内扫描接收对应所述测试信号的接收信号。B2 When the transmitter in A2 sequentially transmits at least one test signal, the receiver simultaneously scans and receives received signals corresponding to the test signals in the test frequency band. 3.根据权利要求2所述的移动通信基站系统无源互调性能测试方法,其特征在于,所述步骤C包含以下子步骤3. mobile communication base station system passive intermodulation performance testing method according to claim 2, is characterized in that, described step C comprises following sub-step C1所述接收机依次接收的对应至少一种所述测试信号的接收信号中除去所述原有外界干扰信号得到纯测试接收信号;C1 removing the original external interference signal from the received signal corresponding to at least one of the test signals received by the receiver in turn to obtain a pure test received signal; C2根据所述纯测试接收信号的频谱分析,对比其对应的所述测试信号的频谱,综合评价所述基站系统的无源互调性能。C2 compares the spectrum of the corresponding test signal according to the spectrum analysis of the pure test received signal, and comprehensively evaluates the passive intermodulation performance of the base station system. 4.根据权利要求3所述的移动通信基站系统无源互调性能测试方法,其特征在于,所述步骤A中,所述基站系统根据测试控制台下发的命令控制所述发射机发射;4. mobile communication base station system passive intermodulation performance testing method according to claim 3, is characterized in that, in described step A, described base station system controls described transmitter to transmit according to the order that test console issues; 所述步骤B中,所述基站系统将所述接收机的所述接收信号上传给所述测试控制台;In the step B, the base station system uploads the received signal of the receiver to the test console; 所述步骤C中,所述测试控制台完成对所述接收信号的分析和所述无源互调性能的评价。In the step C, the test console completes the analysis of the received signal and the evaluation of the passive intermodulation performance. 5.根据权利要求4所述的移动通信基站系统无源互调性能测试方法,其特征在于,所述测试控制台通过近端控制接口直接控制所述基站系统,或者通过基站控制器接口和移动通信网络在远端控制所述基站系统进行测试。5. mobile communication base station system passive intermodulation performance test method according to claim 4, it is characterized in that, described test console directly controls described base station system by near-end control interface, or by base station controller interface and mobile The communication network remotely controls the base station system for testing. 6.根据权利要求5所述的移动通信基站系统无源互调性能测试方法,其特征在于,所述测试控制台通过直接在所述基站系统上安装测试软件,或者通过远端加载所述测试软件,以实现对所述基站系统的控制。6. mobile communication base station system passive intermodulation performance testing method according to claim 5, is characterized in that, described test console is by directly installing test software on described base station system, or by far-end loading described test software to realize the control of the base station system.
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CN114125126A (en) * 2021-12-06 2022-03-01 Oppo广东移动通信有限公司 Intermodulation interference positioning method and device and storage medium
CN114337879B (en) * 2021-12-30 2023-11-24 京信射频技术(广州)有限公司 Multi-system access platform and communication system
CN115580359B (en) * 2022-09-23 2025-05-09 四川恒湾科技有限公司 A method and system for detecting passive intermodulation of base station

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