Wideband radio channel measurement system at 2 GHz

This paper describes the wideband radio channel sounding techniques for mob ile radio channel measurements. Implementation of the cross-correlation met hod using both a sliding correlator and a matched filter detector is presen ted. Limitations and accuracy of radio channel measurements are discussed. Typically, delay resolution of about 20 ns is achieved with 100 MHz bandwid th. With a sliding correlator, a dynamic range of 25 dB was obtained with m aximum Doppler bandwidth of 25 Hz and maximum excess delay of 19 mu s. Digi tal matched filtering with a maximum sampling rate of 125 MHz can be used i n real-time measurements with Doppler shifts of several kilohertz and 30 dB dynamic range. Using matched filter deconvolution as a resolution enhancem ent technique is discussed, Examples of the time-variant complex impulse re sponse measurements are given.