Title :
High resolution coherent radio channel measurements using direct sequence spread spectrum modulation
Author :
Janssen, GJ M. ; Vriens, J.A.M.
Author_Institution :
TNO Phys. & Electron. Lab., The Hague, Netherlands
Abstract :
A measurement system for determination of the characteristics of radio paths in a multipath channel is discussed, and measurement results are presented. The measurement system uses direct-sequence spread-spectrum modulation and operates in the VHF band (30-70 MHz). A carrier, BPSK modulated with a pseudo-noise (PN) sequence at a rate of 1 Mchip/s, is used to sound the radio channel. From the coherently received in-phase and quadrature-phase signals the characteristics of the different radio paths-relative amplitude, RF-phase, and delay-time-are calculated. The accuracy of the measurement system has been determined, and is 2 dB for amplitude information, 5° for the RF-phase, and 20 ns for the delay-time
Keywords :
measurement systems; phase shift keying; radiowave propagation; spread spectrum communication; telecommunication channels; 20 ns; 30 to 70 MHz; BPSK modulated carrier; RF-phase; VHF band; amplitude information; coherent radio channel measurements; delay-time; direct sequence spread spectrum modulation; high resolution measurement; multipath channel; pseudo-noise sequence; quadrature-phase signals; relative amplitude; Adaptive equalizers; Delay; Feeds; Frequency; Intersymbol interference; Multipath channels; Physics; Radio spectrum management; Spread spectrum communication; Urban areas;
Conference_Titel :
Electrotechnical Conference, 1991. Proceedings., 6th Mediterranean
Conference_Location :
LJubljana
Print_ISBN :
0-87942-655-1
DOI :
10.1109/MELCON.1991.161940
