In-band channel sounding in operative cells for mobile and wireless communications

This paper presents an analysis of the swept time delay crosscorrelator, as used in wideband, RF, channel sounding systems, with a view to examining its use in already occupied channels. It is shown that the probe signal can be selectively filtered at the transmitter and receiver to minimise interference to users within the band. This filtering degrades the dynamic range of the sounder and hence the dynamic range can be traded against the spatial resolution performance in a given scenario. An analysis of the various factors is presented and some sample results are discussed.