• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Multimode resonant camera with multiple inputs and outputs for wireless measurements and test drive tests in the laboratory with convertible walls, floor and ceiling. The present invention of analyzer of multiple entrances and multiple exits with convertible walls, floor and ceiling incorporates a system of import of data of drive tests that allows, by means of the previous calibration of the losses of the path of the analyzer, the accomplishment of measures of the real behavior of different terminals in the mobile network without the need to carry out measurements abroad. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2710122A1
    申请号:ES201731231
    申请日:2017-10-18
    公开日:2019-04-23
    发明作者:HERNáNDEZ DAVID AGAPITO SáNCHEZ
    申请人:Emite Ingenieria S L；
    IPC主号:
    专利说明:

    [0001]
    [0002] Field of the invention
    [0003]
    [0004] The present invention is an apparatus that allows to control the electromagnetic fields within a chamber formed by one or more multimode resonant cavities in a precise manner in which the walls of one or more cavities are convertible between completely reflecting and completely absorbent. The multiple input and multiple output analyzer (MIMO Analyzer) incorporates several elements such as: broadband antennas, the metal part with slots that separates the camera into two cavities, the lenses of various kinds, the door, the mode agitators non-metallic removable, the removable rotary table and walls, which are converted from fully reflective to fully absorbent and vice versa, which together with procedures such as the situation of the elements under test outside the cavity allow to control the electromagnetic fields inside. This control allows to emulate the behavior of wireless communication terminals in different real scenarios of exterior and interior in a unique way and better emulating the real environment due to the ability of their walls to transform from totally reflective to fully absorbent and vice versa.
    [0005]
    [0006] Background of the invention
    [0007]
    [0008] An analyzer of multiple inputs and multiple outputs is a camera composed of a set of multimode resonant cavities with high Q factor coupled together by plates with slots that separate them completely, with a very inhomogeneous spatial distribution of the electric and magnetic field. There are several elements and methods to homogenize the field such as: the stirrers of modes, which can be removed and put, the metal parts with slots, the agitators of metal and non-metallic mode or the movement of the object under study inside the cavity . Up to now all the mode agitators have been constructed in metallic materials, some with special shapes as those which can be consulted in WO200054365. On the other hand, pieces The multimode resonant cavities are used in wireless communications applications to perform measurements in the laboratory that emulate those made for mobile terminals in different propagation environments with an isotropic and Rayleigh distribution. Among the parameters that can be measured are: gain diversity, MIMO capacity, antenna efficiency, absorbed power, correlation between antennas, specific absorption rate, antenna sensitivity, error probability per bit (BER), (being revindicated in US Pat. No. 7,286,961 the measurement of the last two in a reverberation chamber). Therefore, only measurements of isotropic Rayleigh environments in multimode resonant cavities could be made up to now. In addition, there is the possibility of making measurements with different liquid-filled manikins with losses that simulate different parts of the human body or different tissues, for example, allowing researchers to investigate the effects produced by the user's head in the mobile terminal.
    [0009]
    [0010] Channel emulators are used in mobile communications applications to inject models of propagation channels directly into terminals through cables, without taking into account the antennas, either through anechoic chambers (with completely absorbing walls) or reverberation (with completely reflective walls).
    [0011] The patent US 8,781,797 describes how a channel emulator can be used to import a small number of cells from a drive test and add a terrain model and a random agitation to make a playback of the results obtained directly on the cables of a terminal, calling this process a Virtual Drive Test tool or VDT Tool. In essence, in US 8.781.797 it allows to reproduce in cables the fields captured in a drive test, without taking into account the effect of the terminal antennas. As the patent itself says, the repetition of captured data is not enough to try to simulate the real environment and you must proceed to add simulations of other parameters such as the terrain model or the density of the network to compensate for these imperfections. It is therefore a simulator.
    [0012]
    [0013] Patent US 7,324,888 describes a similar technique, this time without employing a channel emulator, which employs simulations with tracing different rays to determine the position of a terminal, again through simulations.
    [0014] The patent US 7,349,670 shows us the use of a channel emulator connected by a backplane of connectors to a multitude of WiFi terminals for latency measurements using cables, without any camera and without using real results measured outside.
    [0015]
    [0016] Description of the invention
    [0017]
    [0018] The analyzer of multiple inputs and multiple outputs object of the invention also incorporates on the analyzer of multiple inputs and multiple outputs the various elements that allow the introduction and extraction of the devices under test continuously or the continuous rotation of multiple devices under test in rotating table and therefore no need to open and close the door, which is used exclusively for cleaning and maintenance tasks. The introduction of several devices under test inside the camera allows the realization of tests in parallel to all of them.
    [0019]
    [0020] The elements in the ultrarapid analyzer of multiple inputs and multiple outputs objects of the invention are:
    [0021]
    [0022] The first element included in the multiple input and multiple output analyzer is a sampler, which allows samples of the original drive test signal to be taken every so often, without making any modifications to them. It is a signal digitizer that must meet the Nyquist criteria. In the case of employing emulators of mobile telephone base stations as signal sources this sampler may not be necessary.
    [0023] The second element included in the multi-input and multiple output analyzer is a channel emulator that allows importing the results of a test drive measurements performed outdoors sampled every certain time to provide N injection states, and which we will consider a sample of the original signal source, on which no simulation will be added. For the emulation of certain channel models inside the camera, such as the NIST model, it will not be necessary to use this channel emulator, since the camera will perform the emulation in an innate way without processing the signal.
    [0024]
    [0025] The third element included in the analyzer of multiple inputs and multiple outputs is a calibrator. The calibrator, located between the channel emulator and the multiple input and output analyzer, is responsible for determining for each of the injection states which is the configuration of the analyzer and its path losses that provide a result measured in the same analyzer obtained in the drive test, storing said calibration information for said injection status.
    [0026] The fourth element included in the multiple input and multiple output analyzer is the set of metal parts with slots and the pieces that open and close said slots in the future switching pieces. These elements, which separate the transmitters from the receivers, manage to transform the field distribution from one or more antennas or sources with fixed positions in a distribution that has different sources that switch between active and non-active depending on whether the switching elements open and close said slots. In addition, the switching pieces can be made of different materials, if they are metallic the switching will be on / off by not allowing the signal to pass, while if they are made of other materials that can be partially crossed by the electromagnetic radiation, it will cause a partial activation of said source. Finally, the sources can be activated partially also leaving these slots open.
    [0027]
    [0028] The fifth element in the multiple input and multiple output analyzer is the manufacture of the mode agitators in metal materials and in materials other than metal materials. In this way the electromagnetic waves are not only reflected in metal stirrers, but also refracted and transmitted. Thus the creation of new useful modes for the various applications is achieved.
    [0029]
    [0030] The sixth element in the multiple input and multiple output analyzer is the inclusion of lenses between the signal generation systems and the systems under test. These lenses, for example, will allow modifying the K factor of the simulated environment, that is, the distribution of the electromagnetic field, focusing those modes that pass through them. The seventh element in the multi-input and multiple-output analyzer is that the signal generating systems are antennas with a characteristic shape that have a large bandwidth thus allowing the analyzer to be used with multiple inputs and multiple outputs in a large part of the spectrum.
    [0031]
    [0032] The eighth element in the multiple input and multiple output analyzer is the introduction of lost elements such as liquids with losses in any position or absorbent elements in the walls, ceiling and floor of multimode resonant cavities.
    [0033]
    [0034] The ninth element in the multiple input and multiple output analyzer is the door, which allows the introduction of the devices under test into the cavity and serves for cleaning and maintenance tasks, and can be placed on any of the walls of the chamber. camera.
    [0035] The tenth element in the analyzer of multiple inputs and multiple outputs is the rotary table, which allows to homogenize the electromagnetic field distribution and keep several devices under test that are going to be tested in parallel.
    [0036]
    [0037] The first procedure performed by the multi-input and multi-output analyzer consists in simultaneously applying the original signal, the sampler, the channel emulator, the calibrator and the multimode resonant camera to allow the realization of measurements, not simulations, of unmodified samples of original drive test signals on any terminal in a laboratory chamber without the need to go outside and with one or more devices under test in parallel. This allows to verify the actual behavior of different terminals, including the effects of their antennas, to the same sample of original drive test signal.
    [0038]
    [0039] The second procedure performed by the multiple input and multiple output analyzer consists in removing the agitators from modes to then place absorbent elements on the walls, floor and ceiling of the camera, which are metallic elements and therefore reflective, to convert them into absorbent elements. The fixation to the floor of the absorbent elements can be done simply by the action of gravity while the fixation to the ceiling and walls can be done by means of magnets. In this way the walls, floor and ceiling of the camera go from being totally reflective to fully absorbent, allowing a wide variety of scenarios of distribution and propagation of modes in its interior.
    [0040]
    [0041] The third procedure performed by the analyzer of multiple inputs and multiple outputs consists of removing the absorbers from the walls, ceiling and floor, and placing the agitators in a way, returning the camera to a situation with totally reflective walls.
    [0042]
    [0043] In the drawings:
    [0044]
    [0045] In Figure 1 there is observed an analyzer of multiple entrances and multiple exits (1) comprising the following elements: one or more mode agitators (5), a door (9) for maintenance and cleaning, the sampler (2), the channel emulator (3), the calibrator (4), a slotted metal part (4) and a lens (7).
    [0046] Figure 2 shows the plant with the view of a half-height cut of a multiple input and multiple output analyzer (1) comprising the following elements: a removable mode stirrer (6), a door (10) located on a side wall, several broadband antennas (8), the absorbent elements (9) in the walls of a single cavity and the turntable (10).
    [0047]
    [0048] Figure 3 shows the plant with the view of a half-height cut of a multi-input analyzer and multiple outputs (1) of two cavities separated by a slotted metal part (5) in which only one of the two cavities it has the absorbent elements (9) in walls, ceiling and floor.
    [0049]
    [0050] MODE OF CARRYING OUT THE INVENTION
    [0051] The following examples serve to illustrate the invention and should not be considered as limiting the scope thereof.
    [0052]
    [0053] Example 1: Multi-input analyzer and multiple outputs for measurements of real test samples of wireless communications in the laboratory with different terminals
    [0054]
    [0055] In the favorite embodiment of the multi-input and multiple-output analyzer (1), the number of mode agitators (2) is 2, the sampler (2) can be integrated into the channel emulator (3), the calibrator (4) it acts prior to the measurement in the analyzer (1), the walls, floor and ceiling of the different cavities that make up the chamber do not have the absorbent elements (9), the door is in the front wall as in figure 1 , the metal piece (5) separates two cavities, this slotted and with a lens (7), and has a rotating table (11) inside. This analyzer of multiple inputs and multiple outputs presents the following novelties:
    [0056]
    [0057] The preferred embodiment of the multiple input and multiple output analyzer is designed so that it can be used in the field of wireless communications to measure the behavior of any terminal to the samples of a real signal in the air test drive (over the air) , which has previously been used in the analyzer to calibrate its configuration and trail losses. This provides a competitive advantage against making new drive tests abroad, which also can not be repetitive, and allows to optimize the design and development of devices by observing the measured responses, which, not simulated, these changes lead to the same real signal of the outside sampled to a drive test, all without having to leave the laboratory.
    [0058] In this favorite embodiment the absorbent elements could be fixed to the floor, ceiling and walls of one or several cavities, as well as removing the agitator or modes, so that a greater variety of field and propagation distributions could be measured inside. of electromagnetic waves.
    权利要求:
    Claims (4)
    [1]
    1. The multiple input and multiple output analyzer (1) is a multi-mode resonant chamber with one or several cavities comprising the following elements:
    - A sampler (2)
    - A channel emulator (3), which can have the sampler (2) incorporated
    - A calibrator (4)
    - One or more grooved metal parts (5)
    - One or more mode agitators (6)
    - One or several lenses (7)
    - One or more broadband antennas (8)
    - One or several absorbers (9)
    - A door (10).
    - A rotating table (11)
    [2]
    2. An element according to claim 1, characterized in that several terminals can be measured simultaneously, that is, in a parallel manner at the same time.
    3. An element according to claim 1, characterized in that several wireless communication cells can be measured simultaneously.
    [3]
    3. Method that uses in combination the elements of the multi-input and multiple-output analyzer described in claim 1, characterized in that one or more elements can be fixed in the walls, ceiling and floor of one or more cavities absorbents in order to convert said walls, ceilings and floors of totally reflective elements into totally absorbent elements.
    [4]
    4. Procedure that uses in combination the elements of the multiple analyzer inputs and multiple outputs described in claim 1 characterized by the fact that it aims to measure, not simulate, the response of different wireless terminals to the sample of a signal from a real drive test in the air (over the air), previous calibration.
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    同族专利:
    公开号 | 公开日
    ES2710122B2|2019-09-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2008031964A2|2006-09-14|2008-03-20|European Aeronautic Defence And Space Company Eads France|Reverberation chamber|
    EP2503713A1|2010-01-25|2012-09-26|ZTE Corporation|System and method for antenna testing|
    US20170012714A1|2014-01-30|2017-01-12|Ranlos Ab|Methods and apparatuses for testing wireless communication to vehicles|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201731231A|ES2710122B2|2017-10-18|2017-10-18|MULTIMODE RESONANT CAMERA WITH MULTIPLE INPUTS AND OUTPUTS FOR THE PERFORMANCE OF WIRELESS DRIVING MEASURES AND TESTS IN LABORATORY WITH CONVERTIBLE WALLS, FLOOR AND CEILING|ES201731231A| ES2710122B2|2017-10-18|2017-10-18|MULTIMODE RESONANT CAMERA WITH MULTIPLE INPUTS AND OUTPUTS FOR THE PERFORMANCE OF WIRELESS DRIVING MEASURES AND TESTS IN LABORATORY WITH CONVERTIBLE WALLS, FLOOR AND CEILING|
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