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Measurement of radio channels using an elastic convolver and spread spectrum modulation. I. Implementation

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2 Author(s)
W. Pietsch ; Inst. fur Mobil- und Satellitenfunktechnik, Kamp-Lintfort, Germany ; F. Seifert

Using spread spectrum signals a measurement system has been built in order to measure the radio channel in steel works. It transmits a 511-chip long maximum length sequence with a chip rate of 44 MHz: binary phase shift keying modulated onto a 1.75 GHz carrier. A surface acoustic wave convolver yields the channel's impulse response with a time resolution of about 20 ns. The periodic autocorrelation performed within a measurement window removes aperiodic correlation sidelobes which limit the dynamic range of a matched-filter implementation. Additionally, absolute time delay measurements of all echoes were obtained using a synchronization cable connecting receiver and transmitter. Compared to other spread spectrum correlation techniques, the convolver makes possible a much simpler real-time measurement setup

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:43 ,  Issue: 5 )