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Article history: Received: 20 December, 2018 Accepted: 28 January, 2019 Online : 20 February, 2019 Modern automobiles have been turning more and more into wireless sensor and communication networks. Accordingly, the number of radio systems is steadily increasing. Due to strict safety requirements, these radio systems need to be tested extensively for functionality and reliability, especially under poor radio channel conditions. Beside the large electrical size of cars at frequencies of mobile communication services, access to the antennas imposes challenges for testing, due to an increasingly high integration of the antennas with frontends and digital signal processing. This paper proposes an over-the-air testing procedure for automotive radio systems on the basis of the wireless communication standard Long Term Evolution (LTE). A method to derive the radiation patterns of automotive antennas from reference signals in the LTE downlink scheme without requiring any access to the analogue RF feed point is proposed. A comparison of the LTE approach with the usual antenna measurement techniques shows good agreement. As a logical step from the antenna towards a complete wireless link, a concept of spatially distributed channel emulation on the basis of Software Defined Radio (SDR) modules is proposed, aiming at the emulation of essential multipath features of the wireless channel. RF measurements of the channel transfer function as well as by over-the-air end-to-end tests prove this approach to be a cost-efficient alternative to commercial channel emulators.

Over-The-Air Testing of Automotive Antennas and Wireless Links in The Installed State on The Basis of LTE Downlink Communication Parameters