WO2011020268A1 - 一种多天线系统空间射频性能的测试方法和测试系统 - Google Patents

一种多天线系统空间射频性能的测试方法和测试系统 Download PDF

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Publication number
WO2011020268A1
WO2011020268A1 PCT/CN2009/075574 CN2009075574W WO2011020268A1 WO 2011020268 A1 WO2011020268 A1 WO 2011020268A1 CN 2009075574 W CN2009075574 W CN 2009075574W WO 2011020268 A1 WO2011020268 A1 WO 2011020268A1
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signal
test
paths
antenna
signals
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PCT/CN2009/075574
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English (en)
French (fr)
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郭阳
禹忠
丁添添
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中兴通讯股份有限公司
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Publication of WO2011020268A1 publication Critical patent/WO2011020268A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
    • H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters

Definitions

  • the invention relates to the technical field of radio frequency testing of wireless communication products, and particularly relates to a testing method and a testing system for spatial radio frequency performance of a multi-antenna system. Background technique
  • TRP Total Radiated Power
  • TRS Total Radiated Sensitivity
  • OTA the spatial RF performance
  • test standard for mobile terminal space RF performance is defined as "The test plan for mobile station OTA performance”.
  • the radio frequency performance of the mobile terminal space should be tested in accordance with the requirements of the CTIA standard.
  • TRP and TRS should meet certain limit requirements.
  • the measurement of TRP and TRS is performed on a spherical surface centered on the device under test.
  • the measured wireless communication product is placed on a first rotating shaft or a second rotating shaft of a testing device, the first rotating shaft rotating range is 0-180 degrees, and the second rotating shaft rotating range is 0-360 degrees.
  • the TRP test needs to take a test point every 15 degrees 0 (0-180 degrees) and ⁇ (0-360 degrees), and a total of 264 points need to be tested.
  • the TRS test requires a test point every 30 degrees (0-180 degrees) and ⁇ (0-360 degrees), and a total of 60 points are required.
  • test points are chosen at equal angles, they are non-uniformly distributed on the sphere.
  • the main object of the present invention is to provide a test method and a test system for spatial RF performance of a multi-antenna system to perform spatial RF performance testing under a multi-antenna system.
  • a method for testing spatial RF performance of a multi-antenna system for testing a device under test in a multi-antenna system in a full-wave absorption darkroom comprising:
  • the relay antenna is evenly placed on a circumference centered on the device under test.
  • the simulation process for each of the transmitted signals includes: superimposing all the signals entering the main path of the transmitted signal in one of the transmitted signals to obtain a signal passing through the main path.
  • the number of receiving antennas of the device to be tested is a root, and the transmitting signals of all the roads are a total of 6 roads, and the total number of main paths corresponding to all the transmitting signals is 6 and each of the main paths includes 20 sub-paths;
  • the spatial channel matrix corresponding to the generated multiplex signal is ⁇ ( ⁇ , ⁇ , 6*20, time domain length).
  • the process of the simulation includes:
  • the signal received by the device under test is further applied to perform radio frequency performance testing.
  • a multi-antenna system spatial RF performance test system for testing a device under test in a multi-antenna system in a full-wave absorption darkroom comprising: a device to be tested provided with a receiving antenna, and a relay antenna;
  • the relay antenna is configured to receive a transmission signal for testing, which is sent to itself in the form of a completed multi-path signal, and then send the signal to the device to be tested.
  • the device under test is configured to receive a signal from the relay antenna corresponding to the receiving antenna of the application.
  • the relay antenna is evenly placed on a circumference centered on the device under test.
  • the system further includes a base station signal simulator and a MIMO channel emulator, wherein the base station signal simulator is configured to output the transmit signal for testing;
  • the MIMO channel emulator is configured to simulate the transmit signal output by the base station signal simulator, and send the simulated multi-channel signal to the relay antenna.
  • the number of receiving antennas of the device to be tested is N, and the transmitting signals of all the paths are M paths, and the total number of main paths corresponding to all transmitting signals is six, and each main path includes 20 sub-paths.
  • the system is set up in the LTE system.
  • FIG. 1 is a schematic diagram of a spherical coordinate system established with the wireless communication product under test as an origin;
  • FIG. 2 is a schematic block diagram of a test system for spatial RF performance of the multi-antenna system of the second embodiment.
  • Embodiment 1 The method for testing spatial RF performance of a multi-antenna system includes: placing six antennas around a device under test (DUT) including N receiving antennas, and placing the device under test and the antennas in Full electric wave absorption in the darkroom;
  • DUT device under test
  • the M-channel base station transmitting signal of the M base station transmitting antenna in the LTE base station Simulating and outputting the M-channel base station transmitting signal of the M base station transmitting antenna in the LTE base station; simulating the M-channel base station transmitting signal as 6 signals respectively passing through 6 main paths; respectively transmitting the 6-channel signals to the full-wave wave Absorbing the different antennas in the darkroom; the six antennas respectively send the received signals to the receiving antennas of the device under test.
  • the M is the number of transmitting antennas of the base station
  • the N is the number of receiving antennas of the device under test (DUT); the M and N are integers greater than 1, and may be the same or different.
  • the six channels of the six main paths respectively output by the MIMO channel simulator respectively correspond to the six antennas, and the respective signals are respectively sent to the corresponding antennas;
  • the signal correspondence has a centralized test process and can effectively complete the test process.
  • the six antennas in the all-wave absorption darkroom are evenly placed on the circumference centered on the device under test, that is, the angle between the center angles of any two adjacent antennas of the six antennas is 60 degrees. (The center of the device to be tested is centered); and the six antennas are on the same level as the device to be tested.
  • the six antennas may be referred to as relay antennas, which are important intermediate devices in the detection process; and, in practical applications, the number of relay antennas and their positional relationship with the device under test are not excluded.
  • the number of relay antennas is higher than 6 and the position and correspondence are slightly different from the related descriptions in the above embodiments.
  • the following description uses only the relay antenna as an example.
  • MIMO channel models are divided into two categories, one is a multi-antenna spatial channel model based on the "path" and sub-path principle (see TR25.996), and the other is a correlation matrix-based channel model (see TR25. 814; TR36.814).
  • a multipath-based MIMO channel model is used to simulate a channel environment of complex multipath delay propagation;
  • a multipath based MIMO channel model used in an analog channel environment is composed of six spatial paths, each of the six paths There is a mapping between the transmitted signal of the base station and each path, that is, a part of the signal transmitted by each base station enters each main path.
  • each of the six main paths may be, but not limited to, composed of 20 sub-paths.
  • the step of simulating the transmission signal of the M-channel base station to 6 signals passing through the six main paths may specifically include:
  • Each of the base station transmitting signals (the first base station transmitting signal to the Mth base station transmitting signal) respectively superimposes the signals of each subpath in the path l (path1) to obtain all signals passing the path l (pathl), which It includes signals from all base stations transmitting signals into all 20 sub-paths in path l (pathl); similarly, signals from path 2 (path 2) to path 6 (path 6) can be obtained separately.
  • the multipath-based MIMO channel model is composed of six spatial paths, each path is composed of 20 sub-paths, the number of transmitting antennas on the base station side is M, and the number of receiving antennas of the device under test (DUT) is N. Therefore, the matrix representing the spatial channel is at least 4-dimensional (may be more than 4 dimensions), and the multi-dimensional matrix of the channel matrix H can be expressed as H (M, N, 6*20, time domain length).
  • the step of simulating the transmission signal of the M-channel base station to 6 signals passing through the six main paths may also specifically include:
  • Multiply the M-channel base station transmit signals by the channel elements of the six main paths to obtain six signals that pass through six main paths.
  • This process is equivalent to adding the signals passing through the 20 sub-paths in each path to obtain a signal belonging to each path.
  • the six signals passing through the path l (path1) to the path 6 (path 6) are respectively output to the all-wave absorption darkroom, and the number of antennas in the full-wave absorption darkroom is 6, respectively, and the 6-way letter passing through 6 paths.
  • the signals passing through path1 to path6 are respectively sent to the antenna corresponding to the current path, and each antenna in the all-wave absorption darkroom receives a signal passing through a main path.
  • the number of sub-paths does not have to be 20, but may be slightly different depending on the actual situation.
  • the following description only takes 20 sub-paths as an example.
  • Embodiment 2 A test system for spatial RF performance of a multi-antenna system, comprising: a full-wave absorption darkroom for placing a device under test (DUT) including N receiving antennas, including six placed around the device to be tested Antenna
  • a base station signal simulator for analog output LTE base station, the base station transmitting signal of the M base station transmitting antenna, and the output base station transmitting signal is an M channel signal;
  • a MIMO channel simulator based on multipath fading also referred to as a MIMO channel simulator, is used to simulate a spatial channel condition, and the M-channel base station transmit signal is simulated as 6 paths through 6 main paths respectively. Transmitting the 6-channel signals to different ones of the antennas in the full-wave absorption darkroom;
  • the antenna is configured to send the received signal to each receiving antenna of the device under test.
  • the M is the number of transmitting antennas of the base station, and the N is the number of receiving antennas of the device under test (DUT); the M and N are integers greater than 1, and may be the same or different.
  • the six channels of the six main paths respectively output by the MIMO channel simulator respectively correspond to the six antennas, and the respective signals are respectively sent to the corresponding antennas;
  • the signal correspondence has a centralized test process and can effectively complete the test process.
  • the six antennas in the all-wave absorption darkroom are evenly placed on the circumference centered on the device under test, that is, the angle between the center angles of any two adjacent antennas of the six antennas is 60 degrees. (The center of the device to be tested is centered); and the six antennas are on the same level as the device to be tested.
  • the MIMO channel simulator uses a multipath based MIMO channel model to simulate a channel environment for complex multipath delay propagation.
  • Multipath based based on analog channel environment The MIMO channel model is composed of six spatial paths, and there are mappings between each of the six paths of the base station transmitting signals and each path, that is, a part of the transmitted signals of each base station enters each of the main paths.
  • each of the six main paths may be, but not limited to, composed of 20 sub-paths.
  • the MIMO channel simulator simulates the M-channel base station transmitting signal as 6 signals passing through 6 paths respectively, which may refer to:
  • the MIMO channel simulator superimposes the signals of each subpath in the path l (path1) in each of the base station transmitting signals (the first base station transmitting signal to the Mth base station transmitting signal), and obtains the passing path l (pathl) All signals, including the signals transmitted by each base station into all 20 sub-paths in path l (pathl); similarly, the signals from path 2 (path 2) to path 6 (path 6) can be obtained separately.
  • the multipath-based MIMO channel model is composed of six spatial paths, each path is composed of 20 sub-paths, the number of transmitting antennas on the base station side is M, and the number of receiving antennas of the device under test (DUT) is N. Therefore, the matrix used by the MIMO channel simulator to represent the spatial channel is at least 4 dimensions (may be more than 4 dimensions), and the matrix H of the spatial channel can be represented as H (M, N, 6*20, time domain length).
  • the MIMO channel simulator simulates the M-channel base station transmitting signal as 6 signals passing through 6 paths respectively, and may also refer to:
  • the MIMO channel simulator respectively adds matrix elements of spatial channels of 20 sub-paths in each main path to obtain channel elements of 6 main paths; multiplies transmission signals of M base stations by channels of 6 main paths respectively. Element, get 6 signals through 6 main paths.
  • This process is equivalent to adding the signals passing through the 20 sub-paths in each path to obtain a signal belonging to each path.
  • the MIMO channel simulator outputs six signals from the path l (path 1) to the path 6 (path 6 ) to the all-wave absorption darkroom, respectively, and the number of antennas in the full-wave absorption darkroom is 6, respectively and 6-channel signals of 6 paths - correspondingly, the MIMO channel simulator sends signals from pathl to path6 to the antenna corresponding to the path, respectively, and each antenna in the all-wave absorption darkroom receives the signal The signal of a main path.
  • the LTE base station may be replaced with another signal receiving device such as a base station device, as long as the above-mentioned MIMO radio frequency index test can be successfully implemented; and, the system of the present invention can be set in the LTE system.
  • the signal conversion process of the method and system of the present invention is clean, the correspondence between the signal and the antenna is clear, and the requirements for spatial RF performance testing under the multi-antenna system can be effectively met.
  • the optimization scheme of the present invention further discloses the implementation details of establishing a test environment, the relationship between the antenna and the signal in the all-wave absorption darkroom.
  • An optimization scheme of the present invention discloses that the MIMO channel simulation is a process of superimposing and combining the signals passing through the sub-paths to obtain signals passing through the respective paths, and binarizing the sub-path signals.

Abstract

本发明公开了一种多天线系统空间射频性能的测试方法和测试系统，均可用于在全电波吸收暗室中对多天线系统中的待测设备进行测试。测试时，可实现将输出的用于测试的发射信号针对要测试的多天线系统模拟为相应多路信号；将所述多路信号中的各路信号分别传输至不同的中转天线上，由中转天线将接收到的信号发送给所述待测设备的相应接收天线。可见，本发明方法和系统均能够实现在多天线系统下的空间射频性能测试。

Description

一种多天线系统空间射频性能的测试方法和测试系统 技术领域
本发明涉及无线通信产品的射频测试技术领域， 具体涉及一种多天线 系统空间射频性能的测试方法和测试系统。 背景技术
随着现代工业的发展， 各类无线通讯产品只有具备良好的发射和接收 性能才能保证通讯质量， 即， 总辐射功率（Total Radiated Power, 下文中筒 称为 TRP )要高于一定值， 总辐射灵敏度 ( Total Radiated Sensitivity, TRS ) 要低于一定值，也就是说空间射频性能（Over The Air, 下文中筒称为 OTA ) 测试指标要良好。
CTIA (蜂窝通讯标准化协会） 为了保障移动终端设备在网络中正常使 用， 制定了移动终端空间射频性能的测试标准即 《The test plan for mobile station OTA performance)), 目前， 很多运营商都要求进入其网络的移动终端 空间射频性能要按照 CTIA标准要求进行测试， TRP、 TRS要满足一定的限 值要求。
在 CTIA标准中， 对于 TRP和 TRS的测量是在以被测设备为圓心的球 面上进行取点测试。 为了准确评价被测设备的发射和接收性能， 需要选取 足够多的测试点。 被测无线通信产品放置于一测试装置的第一旋转轴或第 二旋转轴上，第一旋转轴旋转范围为 0-180度，第二旋转轴旋转范围为 0-360 度。 其中 TRP测试需要每隔 15度 Θ ( 0-180度）和 Φ ( 0-360度）取一个 测试点， 总共需要测试 264个点。 TRS测试需每隔 30度 Θ ( 0-180度）和 Φ ( 0-360度）取一个测试点， 共需测试 60个点。 由于测试点是等角度选 取的， 所以其在球面上是非均匀分布的。 TRP、 TRS 需要根据所有的测试 点进行球面积分计算得出。 在积分运算中， 对位于 θ =0, Θ =180的两个测 试点， 其正弦值为零， 所以这两个点不进行测试。
目前的国际标准中尚未有多天线系统（多输入多输出， ΜΙΜΟ )下的射 频指标的测试方案。 发明内容
有鉴于此， 本发明的主要目的在于提供一种多天线系统空间射频性能 的测试方法和测试系统， 以实现在多天线系统下进行空间射频性能测试。
为实现上述目的， 本发明的技术方案是这样实现的：
一种多天线系统空间射频性能的测试方法， 用于在全电波吸收暗室中 对多天线系统中的待测设备进行测试， 该方法包括：
将输出的用于测试的发射信号针对要测试的多天线系统模拟为相应多 路信号； 将所述多路信号中的各路信号分别传输至不同的中转天线上， 由 中转天线将接收到的信号发送给所述待测设备的相应接收天线。
所述中转天线均匀放置在以所述待测设备为圓心的圓周上。
所述模拟操作中， 针对每一路所述发射信号的模拟过程包括： 针对一路发射信号中进入该路发射信号主径的所有信号进行叠加， 得 到通过该主径的一路信号。
所述待测设备的接收天线数目为 Ν根， 所有各路所述发射信号共为 Μ 路， 所有发射信号所对应的主径总数为 6条， 每条主径中包含 20条子径； 完成模拟所生成的所述多路信号所对应的空间信道矩阵为 Η ( Μ, Ν, 6*20, 时域长度）。
所述模拟的过程包括：
分别将各条主径内的 20条所述子径的空间信道的矩阵元素相加， 得到 6条主径的信道元素；
将 Μ路所述发射信号分别乘以 6条主径的信道元素， 得到通过 6条主 径的 6路信号。
进一步应用所述待测设备所接收的信号进行射频性能测试。
一种多天线系统空间射频性能的测试系统， 用于在全电波吸收暗室中 对多天线系统中的待测设备进行测试， 包括： 设置有接收天线的待测设备， 还包括中转天线；
其中， 所述中转天线， 用于接收以完成模拟的多路信号形式向自身发 送的用于测试的发射信号， 再向所述待测设备发送；
所述待测设备， 用于应用自身的接收天线对应接收来自中转天线的各 路信号。
所述中转天线均匀放置在以所述待测设备为圓心的圓周上。
该系统进一步包括基站信号模拟器和 MIMO信道仿真器， 其中， 所述基站信号模拟器， 用于输出用于测试的所述发射信号；
所述 MIMO信道仿真器， 用于对基站信号模拟器输出的所述发射信号 进行模拟， 将完成模拟的多路信号向所述中转天线发送。
所述待测设备的接收天线数目为 N根， 所有各路所述发射信号共为 M 路， 所有发射信号所对应的主径总数为 6条， 每条主径中包含 20条子径。
该系统设置于 LTE系统中。
可见， 本发明方法和系统的信号转换过程筒洁， 信号与天线间的对应 关系清楚， 并可以有效满足多天线系统下进行空间射频性能测试的要求。 附图说明
图 1是以被测无线通讯产品为原点建立的球面坐标系示意图； 图 2是实施例二的多天线系统空间射频性能的测试系统的示意框图。 具体实施方式 以下结合附图对本发明的优选实施例进行说明， 应当理解， 此处所描 述的优选实施例仅用于说明和解释本发明， 并不用于限定本发明。
实施例一， 一种多天线系统空间射频性能的测试方法， 包括： 在包括 N根接收天线的待测设备 ( DUT )周围放置 6根天线， 将所述 待测设备和所述天线都放置在全电波吸收暗室中；
模拟输出 LTE基站中 M根基站发射天线的 M路基站发射信号； 将该 M路基站发射信号模拟为分别通过 6条主径的 6路信号； 将所述 6路信号分别传输至所述全电波吸收暗室中不同的所述天线上； 所述 6根天线分别将接收到的信号发送给所述待测设备的各接收天线。 其中， 所述 M是基站发射天线数， 所述 N为待测设备 ( DUT )的接收 天线数； 所述 M和 N均为大于 1的整数， 可以相同或不同。
可见， 所述 MIMO信道模拟器输出的所述分别通过 6条主径的 6路信 号分别与所述 6根天线——对应， 将各路信号分别发送到各自对应的天线 上； 这种筒单的信号对应关系筒化了测试过程， 可以有效的完成测试过程。
所述全电波吸收暗室中的 6根天线均匀放置在以所述待测设备为圓心 的圓周上， 也就是说， 6根天线中任意 2根相邻天线之间的圓心角夹角为 60度（以所述待测设备为圓心 ); 且所述 6根天线与待测设备处于同一水平 面上。
通常， 可以将所述的 6根天线称为中转天线， 这些天线是检测过程中 重要的中间器件； 并且， 在实际应用中， 不排除中转天线的数目及其和待 测设备之间的位置关系为其它情况， 如： 中转天线的数目高于 6跟， 并且 其位置及对应关系与以上所述实施例中的相关描述略有不同。 为了描述方 便、 清楚， 以下描述仅以中转天线为 6跟为例。
常用的 MIMO信道模型分为两类， 一类是基于 "径"（path)和子径原理 的多天线空间信道模型 (参见 TR25.996), 另一类是基于相关矩阵的信道模 型（参见 TR25.814;TR36.814)。 本实施例中， 采用基于多径的 MIMO信道模型来模拟复杂多径延迟传 播的信道环境； 模拟信道环境时采用的基于多径的 MIMO信道模型由 6条 空间径组成， 所述 6条径每路基站发射信号与每条径之间都存在映射， 也 就是说每路基站发射信号中都有一部分进入每条主径。
本实施例中， 所述 6条主径中的每条可以但不限于由 20条子径组成。 本实施例中， 所述将 M路基站发射信号模拟为分别通过 6条主径的 6 路信号的步骤具体可以包括：
分别将每路基站发射信号 （第 1路基站发射信号到第 M路基站发射信 号） 中通过径 l(pathl)中各子径的信号进行叠加， 得到通过径 l(pathl)的所 有信号， 这其中包括每路基站发射信号进入径 l(pathl)中的所有 20条子径 的信号； 同理可以分别得到通过径 2(path2) 到径 6(path6)的各路信号。
本实施例中， 基于多径的 MIMO信道模型由 6条空间径组成， 每条径 由 20条子径组成， 基站侧的发射天线数为 M, 待测设备 ( DUT )的接收天 线数为 N, 所以表示空间信道的矩阵至少是 4维的 （可以多于 4维）， 信道 矩阵 H的多维矩阵可表示为 H ( M, N, 6*20, 时域长度）。
本实施例中， 所述将 M路基站发射信号模拟为分别通过 6条主径的 6 路信号的步骤也可以具体包括：
分别将各条主径内的 20条子径的空间信道的矩阵元素相加， 得到 6条 主径的信道元素；
将 M路基站发射信号分别乘以 6条主径的信道元素， 得到通过 6条主 径的 6路信号。
这个过程等效于将通过每条径内的 20条子径的信号相加， 从而得到属 于每条径的信号。
最后， 将通过径 l(pathl)到径 6(path6)的 6路信号分别输出至所述全电 波吸收暗室， 全电波吸收暗室中的天线数为 6, 分别和通过 6条径的 6路信 号——对应， 将通过 pathl到 path6的信号分别发送给本径对应的天线， 在 所述全电波吸收暗室中的每根天线接收到的是通过一条主径的信号。
在实际应用中， 所述子径的数目不一定必须为 20条， 而是可以根据实 际情况略有不同。 为了描述方便、 清楚， 以下描述仅以子径为 20条为例。
实施例二， 一种多天线系统空间射频性能的测试系统， 包括： 用于放置包括 N根接收天线的待测设备 ( DUT ) 的全电波吸收暗室， 包括 6个放置在所述待测设备周围的天线；
基站信号模拟器（BS emulator ), 用于模拟输出 LTE基站中 M根基站 发射天线的基站发射信号， 所输出的基站发射信号为 M路信号；
基于多径衰落的 MIMO信道模拟器（ MIMO channel simulator ), 也可 称为 MIMO信道仿真器， 用于模拟空间信道状况， 将所述 M路基站发射信 号模拟为分别通过 6条主径的 6路信号； 将所述 6路信号分别传输至所述 全电波吸收暗室中不同的所述天线上；
所述天线用于将接收到的信号发送给所述待测设备的各接收天线。 其中， 所述 M是基站发射天线数， 所述 N为待测设备 ( DUT )的接收 天线数； 所述 M和 N均为大于 1的整数， 可以相同或不同。
可见， 所述 MIMO信道模拟器输出的所述分别通过 6条主径的 6路信 号分别与所述 6根天线——对应， 将各路信号分别发送到各自对应的天线 上； 这种筒单的信号对应关系筒化了测试过程， 可以有效的完成测试过程。
所述全电波吸收暗室中的 6根天线均匀放置在以所述待测设备为圓心 的圓周上， 也就是说， 6根天线中任意 2根相邻天线之间的圓心角夹角为 60度（以所述待测设备为圓心 ); 且所述 6根天线与待测设备处于同一水平 面上。
本实施例中，所述 MIMO信道模拟器采用基于多径的 MIMO信道模型 来模拟复杂多径延迟传播的信道环境。 模拟信道环境时采用的基于多径的 MIMO信道模型由 6条空间径组成， 所述 6条径每路基站发射信号与每条 径之间都存在映射， 也就是说每路基站发射信号中都有一部分进入每条主 径。
本实施例中， 所述 6条主径中的每条可以但不限于由 20条子径组成。 本实施例中，所述 MIMO信道模拟器将所述 M路基站发射信号模拟为 分别通过 6条径的 6路信号可以是指：
所述 MIMO信道模拟器分别将每路基站发射信号 （第 1路基站发射信 号到第 M路基站发射信号） 中通过径 l(pathl)中各子径的信号进行叠加， 得到通过径 l(pathl)的所有信号， 这其中包括每路基站发射信号进入径 l(pathl)中的所有 20条子径的信号； 同理可以分别得到通过径 2(path2) 到 径 6(path6)的各路信号。
本实施例中， 基于多径的 MIMO信道模型由 6条空间径组成， 每条径 由 20条子径组成， 基站侧的发射天线数为 M, 待测设备 ( DUT )的接收天 线数为 N, 所以所述 MIMO信道模拟器用来表示空间信道的矩阵至少是 4 维的 （可以多于 4维 ), 该空间信道的矩阵 H可表示为 H ( M, N, 6*20, 时域长度）。
本实施例中，所述 MIMO信道模拟器将所述 M路基站发射信号模拟为 分别通过 6条径的 6路信号也可以是指：
所述 MIMO信道模拟器分别将各条主径内的 20条子径的空间信道的矩 阵元素相加， 得到 6条主径的信道元素； 将 M路基站发射信号分别乘以 6 条主径的信道元素， 得到通过 6条主径的 6路信号。
这个过程等效于将通过每条径内的 20条子径的信号相加， 从而得到属 于每条径的信号。
所述 MIMO信道模拟器将通过径 l(pathl)到径 6(path6)的 6路信号分别 输出至所述全电波吸收暗室， 全电波吸收暗室中的天线数为 6, 分别和通过 6条径的 6路信号——对应， 所述 MIMO信道模拟器将通过 pathl到 path6 的信号分别发送给这个径对应的天线， 在所述全电波吸收暗室中的每根天 线接收到的是通过一条主径的信号。
需要说明的是， 可以将所述 LTE基站替换为其它的基站设备等信号收 发装置， 只要能顺利实现上述的 MIMO下射频指标测试即可； 并且， 本发 明系统可以设置于 LTE系统中。
综上所述可知， 本发明方法和系统的信号转换过程筒洁， 信号与天线 间的对应关系清楚， 并可以有效的满足多天线系统下进行空间射频性能测 试的要求。 本发明的优化方案进一步披露了建立测试环境， 全电波吸收暗 室中天线与信号的关系等实现细节。 本发明的一个优化方案公开了 MIMO 信道模拟是对通过子径的信号进行叠加合并处理得到通过各条径的信号， 筒化了子径信号的处理过程。
以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于 本领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精 神和原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明 的保护范围之内。

Claims

权利要求书
1、 一种多天线系统空间射频性能的测试方法， 用于在全电波吸收暗室 中对多天线系统中的待测设备进行测试， 其特征在于， 该方法包括：
将输出的用于测试的发射信号针对要测试的多天线系统模拟为相应多 路信号； 将所述多路信号中的各路信号分别传输至不同的中转天线上， 由 中转天线将接收到的信号发送给所述待测设备的相应接收天线。
2、 如权利要求 1所述的测试方法， 其特征在于：
所述中转天线均匀放置在以所述待测设备为圓心的圓周上。
3、如权利要求 1或 2所述的测试方法，其特征在于，所述模拟操作中， 针对每一路所述发射信号的模拟过程包括：
针对一路发射信号中进入该路发射信号主径的所有信号进行叠加， 得 到通过该主径的一路信号。
4、 如权利要求 3所述的测试方法， 其特征在于：
所述待测设备的接收天线数目为 N根， 所有各路所述发射信号共为 M 路， 所有发射信号所对应的主径总数为 6条， 每条主径中包含 20条子径； 完成模拟所生成的所述多路信号所对应的空间信道矩阵为 H ( M, N, 6*20, 时域长度）。
5、如权利要求 4所述的测试方法，其特征在于，所述模拟的过程包括： 分别将各条主径内的 20条所述子径的空间信道的矩阵元素相加， 得到 6条主径的信道元素；
将 M路所述发射信号分别乘以 6条主径的信道元素， 得到通过 6条主 径的 6路信号。
6、 如权利要求 1所述的测试方法， 其特征在于， 进一步应用所述待测 设备所接收的信号进行射频性能测试。
7、 一种多天线系统空间射频性能的测试系统， 用于在全电波吸收暗室 中对多天线系统中的待测设备进行测试， 其特征在于， 包括： 设置有接收 天线的待测设备， 还包括中转天线；
其中， 所述中转天线， 用于接收以完成模拟的多路信号形式向自身发 送的用于测试的发射信号， 再向所述待测设备发送；
所述待测设备， 用于应用自身的接收天线对应接收来自中转天线的各 路信号。
8、 如权利要求 7所述的测试系统， 其特征在于， 所述中转天线均匀放 置在以所述待测设备为圓心的圓周上。
9、 如权利要求 7或 8所述的测试系统， 其特征在于， 该系统进一步包 括基站信号模拟器和 MIMO信道仿真器， 其中，
所述基站信号模拟器， 用于输出用于测试的所述发射信号；
所述 MIMO信道仿真器， 用于对基站信号模拟器输出的所述发射信号 进行模拟， 将完成模拟的多路信号向所述中转天线发送。
10、 如权利要求 7所述的测试系统， 其特征在于：
所述待测设备的接收天线数目为 N根， 所有各路所述发射信号共为 M 路， 所有发射信号所对应的主径总数为 6条， 每条主径中包含 20条子径。
11、 如权利要求 7所述的测试系统， 其特征在于， 该系统设置于 LTE 系统中。
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