Indoor and outdoor time dispersion measurements at 1.8 GHz

摘要

The results of time dispersion measurements in and around the City of Liverpool at 1.8 GHz are presented. Measurements were conducted in three different locations: urban, open area with residential houses and a modern superstore. A swept time-delay cross-correlation (STDCC) channel sounder with 33 ns resolution was employed to measure the complex bandpass impulse response of the channel. The complete system provided a phase change of 1 cycle in 360 s. This superior stability coupled with the inclusion of an automatic gain control circuitry in the RF stage allowed continuous measurements for longer distances (130 m), the only limitation being the amount of extended memory in the PC. The system was used to create a large database of power delay profiles from each area.