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Coexistence measurements promise excellent car connectivity

Posted: 20 Oct 2015     Print Version  Bookmark and Share

Keywords:Rohde & Schwarz  WLAN  Bluetooth  connected car  coexistence measurement 

As a result, both the wanted and the unwanted signal can be generated using a single instrument. To ensure a realistic simulation of the signal propagation within the passenger compartment along with any reciprocal interference, the test setup must always include a connection via the air interface instead of the more easily implemented cable connection.

For small setups, a compact test chamber can be used for this purpose. The R&S CMW500 frontend includes multiple RF connectors for the transmit and receive signal paths, eliminating the need for a switch matrix in the simplest scenarios.

A further multistandard platform is recommended for simulating diversity reception of broadcast signals. The R&S BTC broadcast test centre uses two independent real-time signal paths and up to eight arbitrary waveform generators to generate all of the required RF signals for international TV and broadcast standards, including the relevant interferer signals. As a result, developers have access to signals from local public networks as well as those from other countries required for a globally valid scenario.


The R&S BTC can be used for complex diversity reception scenarios for broadcast signals. The frequency and level of the individual wanted and unwanted signals can be adjusted in real time.


The described scenarios are not only about permitting users to make phone calls from the car or to connect their portable devices to the vehicle infotainment system. Future cars will have a fixed connection to their environment. This connection can provide quick access from the car to the company server or the home A/C system or from the automotive service centre back to the car to permit remote fault diagnostics.

WLAN standard 802.11p permits the exchange of information between vehicles, for example to provide a warning about an accident, roadwork or icy road surfaces. Europe, the USA, South Korea and Japan have allocated frequency bands for this purpose. To further optimise reception in the car, future automobiles are planned to be equipped with their own mobile stations (LTE hotspots). These hotspots, which are being used in buildings, not only ensure a good connection between the car antenna and the wireless devices, but also permit individual adjustment of the transmit power to reduce interference within the vehicle.

- Christoph Wagner
  EE Times Europe

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