air test

Abstract

A pre-selector that forms a plurality of pre-selections by generating a pre-determined number of random positions for each pre-selection, wherein each position is among the pre-determined number of antenna elements surrounding the device under test for use in the over-the-air test an antenna element. The selector selects a preselection from said plurality of preselections for at least one path of the radio channel to be simulated, wherein the absolute error between the theoretical and real spatial correlation corresponding to the preselection is below a predetermined threshold. Connectors connect selected antenna elements at various preselected locations with the radio channel emulator to physically implement the simulated radio channel for the device under test and the radio channel emulator.

Description

technical field [0001] The present invention relates to over-the-air testing of devices in an echogenic chamber. Background technique [0002] When a radio frequency signal is transmitted from a transmitter to a receiver, the signal travels in a radio channel along one or more paths with different angles of arrival, signal delays, polarizations, and powers, resulting in the received Fades of different duration and strength in the signal. Additionally, noise and interference due to other transmitters can interfere with the radio connection. [0003] Transmitters and receivers can be tested using radio channel emulators that simulate real conditions. In digital radio channel emulators, the radio channel is usually modeled with an FIR filter (Finite Impulse Response). Traditional radio channel emulation testing is performed with a lead-through connection where the transmitter and receiver are coupled together by a cable. [0004] Communication between a subscriber terminal ...

AI Technical Summary

Problems solved by technology

But when the number of antenna element-specific channels increases, the test system becomes more complex and expensive

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