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Over-the-air test

A technology for over-the-air downloading and testing areas, which is applied in the direction of measuring devices, measuring electrical variables, and transmission systems, and can solve problems such as echoes, radio channel distortion, simulation quality, and deterioration, and achieve the effect of large distortion

Active Publication Date: 2014-03-19
KEYSIGHT TECH SINGAPORE (SALES) PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The OTA antenna itself often causes echoes in the room
These unwanted reflections distort the simulated radio channel and degrade the simulation quality
On the other hand, making an OTA room anechoic enough for radio channel emulation is technically very challenging, especially for mid-range budgets

Method used

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Examples

Experimental program
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Embodiment Construction

[0024] Exemplary embodiments are described more fully hereinafter with reference to the accompanying drawings in which certain embodiments are shown. Although this specification refers to "an," "an," or "an" embodiment in various places, it does not necessarily mean that each such reference refers to the same embodiment, or that all The features described above apply to a single embodiment only. Single features of different embodiments may also be combined to provide other embodiments. Therefore, all words and expressions should be read broadly, and they are intended to explain, not to limit, each embodiment.

[0025] This application is concerned with the quantification and compensation of reflections, scattering and other imperfections within an OTA chamber in a MIMO OTA test setup.

[0026] figure 1 The fundamentals of calibration measurements in an OTA chamber are presented in 2D. Although the OTA room 100 should not have any effect on the simulated radio channel, the ...

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PUM

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Abstract

A radio channel generator has a radio channel model predistorted on the basis of a predetermined chamber model (98). An emulator (118) receives the weights of the radio channel model predistorted on the basis of the chamber model (98). A transmitter (122) feeds a communication signal to the emulator (118). The emulator (118) weights the communication signal with the radio channel model predistorted on the basis of the chamber model (98). The over-the-air antennas (102-116) receive the weighted communication signal and transmit it to a device under test (300). The chamber model (98) is based on a simulation or a measurement. The chamber model (98) takes into account undesired interactions in the over-the-air chamber for cancelling them during the radio channel emulation.

Description

technical field [0001] The present invention relates to over the air testing of devices in an anechoic chamber. Background technique [0002] When a radio frequency signal is sent from a transmitter to a receiver, the signal propagates in a radio channel along one or more paths with different angles of arrival, signal delays, polarizations and powers. In addition the frequency may vary due to the Doppler effect. These changes can result in varying signal strengths and fades of varying durations. Additionally, noise and interference with radio connections caused by other transmitters. [0003] Transmitters and receivers can be tested using a radio channel emulator that simulates real-world conditions. In digital radio channel simulators, the radio channel is usually modeled using FIR (Finite Impulse Response) filters. [0004] The communication between the DUT (on the test set) and the base station of the radio system can be tested using OTA (over the air) testing, where ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00G01R29/08
CPCH04B17/0092H01Q3/267G01R29/0821H04B17/0085H04B17/0062H04B17/009H04B15/00H04B17/0095H04B17/21H04B17/391H04B17/3911H04B17/3912
Inventor P·屈厄斯蒂T·莱蒂宁
Owner KEYSIGHT TECH SINGAPORE (SALES) PTE LTD
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