Radio Channel Measurements Using a Broadband Pseudo-Noise Signal (Measurement Set-Up and Processing of the Results)
Abstract
In a multipath communications environment, which is often found in urban areas, transmission of information is difficult due to self-interference. This self-interference may result in signal suppression and intersymbol interference. Knowledge of the parameters that characterize the radio channel, can be used to feed an adaptive equalizer or frequency management system, in order to minimize these disturbing effects. In this report a measurement system, to measure the characteristics of radio paths in a multipath channel, is described and measurement results are given. The measurement system uses Pseudo-Noise Spread Spectrum modulation and operates in the VHF-band (30-70 MHz). A carrier, BPSK modulated with the Pseudo-Noise signal at a rate of 1 Mchip/s, is used to sound the radio channel. The characteristics of the different radio paths: relative amplitude, RF-phase and delay-time, are calculated from the coherently received signal. The accuracy of the measurement system has been determined and is: 2 dB for the amplitude, 5 degrees for the RF-phase and 20 ns for the delay-time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1991
- Accession Number
- ADA245601
Entities
People
- G. J. Janssen
- J. A. Vriens
Organizations
- Netherlands Organisation for Applied Scientific Research