Bit error measurements on a 5.8 GHz mobile radio channel for short range traffic management systems

Abstract

To investigate the performance of a planned short range traffic management system with data rates more than 1 MBits/sec in case of multipath effects, an experimental system has been built. Bit error properties are investigated by recording transmitted pn-sequences in real time and off-line analysis using correlation techniques. Measurement results regarding the dependence of bit errors and dock errors on the covered distance are presented for the downlink. The results show that a sufficient range of about 25 m is achievable for synchronous data transfer.

Space diversity and polarisation diversity enhance the performance of a 5.8 GHz radio link for traffic management systems

“…Hence, it's more suitable to be used in the practical system. An additional technique to improve transmission quality is, to radiate the signal with two beacons operating with different frequencies [3,4] so that blockage effects are reduced. …”

“…A suitable transmission medium for the required bidirectie nal data exchange between a roadside beacon and the individual vehicle is the short range system with a radio link operating at 5.8 GHz [l, 21. Due to the short range, the vehicle communication unit operates as a transponder in the uplink mode [3]. Consequently, an important criterion of the quality of the communication in uplink and downlink mode is the received power of the vehicle antenna.…”

Investigation on propagation characteristics of a short range radio link with statistical distributed reflectors

“…To study the link performance in multipath fading channels, a deterministic channel model was derived [3]. Calculations, considering the radiation characteristics of the applied antennas as well as the reflectors 'motorhood' and 'road', are already confirmed by measurements [4]. Since the mobile channel is in general composed of further reflectors, e.g.…”